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Bas_gcc_mm
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Bas_gcc_mm
| Author | SHA1 | Date | |
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c70dc9ae0d | ||
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c427fea43a | ||
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69539e93a6 | ||
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aa3ae8ecba | ||
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4d68242185 | ||
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68b4240355 | ||
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83666ba2f5 | ||
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f044fbbe72 | ||
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6a1bcae947 | ||
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a1c4fdff47 | ||
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8d6154e69b |
1
Makefile
1
Makefile
@@ -143,7 +143,6 @@ CSRCS= \
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ASRCS= \
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startcf.S \
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printf_helper.S \
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exceptions.S \
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xhdi_vec.S \
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pci_wrappers.S
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@@ -78,7 +78,6 @@ SECTIONS
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OBJDIR/s19reader.o(.text)
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OBJDIR/bas_printf.o(.text)
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OBJDIR/bas_string.o(.text)
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OBJDIR/printf_helper.o(.text)
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OBJDIR/cache.o(.text)
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OBJDIR/dma.o(.text)
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OBJDIR/MCD_dmaApi.o(.text)
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@@ -55,11 +55,6 @@
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#define CF_CACR_EUSP (0x00000020) /* Switch stacks in user mode */
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#define CF_CACR_DF (0x00000010) /* Disable FPU */
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#define _DCACHE_SET_MASK ((DCACHE_SIZE/64-1)<<CACHE_WAYS)
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#define _ICACHE_SET_MASK ((ICACHE_SIZE/64-1)<<CACHE_WAYS)
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#define LAST_DCACHE_ADDR _DCACHE_SET_MASK
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#define LAST_ICACHE_ADDR _ICACHE_SET_MASK
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#define ICACHE_SIZE 0x8000 /* instruction - 32k */
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#define DCACHE_SIZE 0x8000 /* data - 32k */
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@@ -67,6 +62,10 @@
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#define CACHE_SETS 0x0200 /* 512 sets */
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#define CACHE_WAYS 0x0004 /* 4 way */
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#define _DCACHE_SET_MASK ((DCACHE_SIZE / 64 - 1) << CACHE_WAYS)
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#define _ICACHE_SET_MASK ((ICACHE_SIZE / 64 - 1) << CACHE_WAYS)
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#define LAST_DCACHE_ADDR _DCACHE_SET_MASK
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#define LAST_ICACHE_ADDR _ICACHE_SET_MASK
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#define CACHE_DISABLE_MODE (CF_CACR_DCINVA+ \
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CF_CACR_BCINVA+ \
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@@ -51,7 +51,7 @@
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*/
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#define SCA_PAGE_ID 6 /* indicates video memory page */
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#define DEFAULT_PAGE_SIZE 0x2000 /* use 8k pages for MiNT compatibility */
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/*
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* MMU page sizes
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*/
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@@ -67,10 +67,13 @@ enum mmu_page_size
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/*
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* cache modes
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*/
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#define CACHE_WRITETHROUGH 0
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#define CACHE_COPYBACK 1
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#define CACHE_NOCACHE_PRECISE 2
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#define CACHE_NOCACHE_IMPRECISE 3
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enum mmu_cache_modes
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{
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CACHE_WRITETHROUGH = 0,
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CACHE_COPYBACK = 1,
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CACHE_NOCACHE_PRECISE = 2,
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CACHE_NOCACHE_IMPRECISE = 3
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};
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/*
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@@ -83,23 +86,14 @@ enum mmu_page_size
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#define ACCESS_WRITE (1 << 1)
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#define ACCESS_EXECUTE (1 << 2)
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struct mmu_map_flags
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{
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unsigned cache_mode:2;
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unsigned protection:1;
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unsigned page_id:8;
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unsigned access:3;
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unsigned locked:1;
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unsigned unused:17;
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};
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/*
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* global variables from linker script
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*/
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extern long video_tlb;
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extern long video_sbt;
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extern void mmu_enable(void);
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extern void mmu_init(void);
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extern int mmu_map_page(uint32_t virt, uint32_t phys, enum mmu_page_size sz, const struct mmu_map_flags *flags);
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extern int mmu_map_8k_page(uint32_t adr, uint8_t asid);
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#endif /* _MMU_H_ */
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10
sys/BaS.c
10
sys/BaS.c
@@ -306,6 +306,12 @@ void BaS(void)
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mmu_init();
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xprintf("finished\r\n");
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xprintf("enable MMU: ");
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mmu_enable(); /* force pipeline sync */
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xprintf("finished\r\n");
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xprintf("initialize exception vector table: ");
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vec_init();
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xprintf("finished\r\n");
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@@ -313,10 +319,6 @@ void BaS(void)
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xprintf("flush caches: ");
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flush_and_invalidate_caches();
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xprintf("finished\r\n");
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xprintf("enable MMU: ");
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MCF_MMU_MMUCR = MCF_MMU_MMUCR_EN; /* MMU on */
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NOP(); /* force pipeline sync */
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xprintf("finished\r\n");
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#ifdef MACHINE_FIREBEE
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xprintf("IDE reset: ");
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@@ -95,7 +95,8 @@ void flush_icache_range(void *address, size_t size)
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start_set = (uint32_t) address & _ICACHE_SET_MASK;
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end_set = (uint32_t) endaddr & _ICACHE_SET_MASK;
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if (start_set > end_set) {
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if (start_set > end_set)
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{
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/* from the begining to the lowest address */
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for (set = 0; set <= end_set; set += (0x10 - 3))
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{
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@@ -115,7 +116,8 @@ void flush_icache_range(void *address, size_t size)
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/* next loop will finish the cache ie pass the hole */
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end_set = LAST_ICACHE_ADDR;
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}
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for (set = start_set; set <= end_set; set += (0x10 - 3)) {
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for (set = start_set; set <= end_set; set += (0x10 - 3))
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{
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__asm__ __volatile__(
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" cpushl ic,(%[set]) \n\t"
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" addq.l #1,%[set] \n\t"
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298
sys/exceptions.S
298
sys/exceptions.S
@@ -45,22 +45,37 @@
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.extern _irq5_handler
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.extern _irq7_handler
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/* Register read/write macros */
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#define MCF_EPORT_EPPAR __MBAR+0xF00
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#define MCF_EPORT_EPDDR __MBAR+0xF04
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#define MCF_EPORT_EPIER __MBAR+0xF05
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#define MCF_EPORT_EPDR __MBAR+0xF08
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#define MCF_EPORT_EPPDR __MBAR+0xF09
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#define MCF_EPORT_EPFR __MBAR+0xF0C
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#define MCF_GPIO_PODR_FEC1L __MBAR+0xA07
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#define MCF_PSC0_PSCTB_8BIT __MBAR+0x860C
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.global _vec_init
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// interrupt sources
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/* Register read/write equates */
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/* MMU */
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.equ MCF_MMU_MMUCR, __MMUBAR
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.equ MCF_MMU_MMUOR, __MMUBAR+0x04
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.equ MCF_MMU_MMUSR, __MMUBAR+0x08
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.equ MCF_MMU_MMUAR, __MMUBAR+0x10
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.equ MCF_MMU_MMUTR, __MMUBAR+0x14
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.equ MCF_MMU_MMUDR, __MMUBAR+0x18
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/* EPORT flag register */
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.equ MCF_EPORT_EPFR, __MBAR+0xf0c
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/* FEC1 port output data direction register */
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.equ MCF_GPIO_PODR_FEC1L, __MBAR+0xa07
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/* PSC0 transmit buffer register */
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.equ MCF_PSC0_PSCTB_8BIT, __MBAR+0x860c
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/* GPT mode select register */
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.equ MCF_GPT0_GMS, __MBAR+0x800
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/* Slice timer 0 count register */
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.equ MCF_SLT0_SCNT, __MBAR+0x908
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/* interrupt sources */
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.equ INT_SOURCE_EPORT_EPF1,1 // edge port flag 1
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.equ INT_SOURCE_EPORT_EPF2,2 // edge port flag 2
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.equ INT_SOURCE_EPORT_EPF3,3 // edge port flag 3
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@@ -115,85 +130,15 @@
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// Atari register equates (provided by FPGA)
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.equ vbasehi, 0xffff8201
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//mmu ---------------------------------------------------
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/* Register read/write macros */
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#define MCF_MMU_MMUCR __MMUBAR
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#define MCF_MMU_MMUOR __MMUBAR + 0x04
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#define MCF_MMU_MMUSR __MMUBAR + 0x08
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#define MCF_MMU_MMUAR __MMUBAR + 0x10
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#define MCF_MMU_MMUTR __MMUBAR + 0x14
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#define MCF_MMU_MMUDR __MMUBAR + 0x18
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/* Bit definitions and macros for MCF_MMU_MMUCR */
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#define MCF_MMU_MMUCR_EN (0x1)
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#define MCF_MMU_MMUCR_ASM (0x2)
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/* Bit definitions and macros for MCF_MMU_MMUOR */
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#define MCF_MMU_MMUOR_UAA (0x1) /* update allocation address, i.e. write to TLB */
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#define MCF_MMU_MMUOR_ACC (0x2) /* activate access to TLB */
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#define MCF_MMU_MMUOR_RW (0x4) /* read/write TLB */
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#define MCF_MMU_MMUOR_ADR (0x8) /* search by address/TLB address */
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#define MCF_MMU_MMUOR_ITLB (0x10) /* act on instruction/data TLBs */
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#define MCF_MMU_MMUOR_CAS (0x20) /* clear all unlocked TLBs with matching ASID */
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#define MCF_MMU_MMUOR_CNL (0x40) /* clear all unlocked TLBs regardless of ASID */
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#define MCF_MMU_MMUOR_CA (0x80) /* clear all TLBs */
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#define MCF_MMU_MMUOR_STLB (0x100) /* search TLBs */
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#define MCF_MMU_MMUOR_AA(x) (((x) & 0xFFFF) << 0x10) /* TLB allocation address */
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/* Bit definitions and macros for MCF_MMU_MMUSR */
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#define MCF_MMU_MMUSR_HIT (0x2) /* last lookup had a hit in TLB */
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#define MCF_MMU_MMUSR_WF (0x8) /* indicate write fault */
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#define MCF_MMU_MMUSR_RF (0x10) /* indicate read fault */
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#define MCF_MMU_MMUSR_SPF (0x20) /* indicate supervisor protect fault */
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/* Bit definitions and macros for MCF_MMU_MMUAR */
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#define MCF_MMU_MMUAR_FA(x) (((x) & 0xFFFFFFFF) << 0)
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/* Bit definitions and macros for MCF_MMU_MMUTR */
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#define MCF_MMU_MMUTR_V (0x1) /* valid bit for TLB */
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#define MCF_MMU_MMUTR_SG (0x2) /* set page as shared global */
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#define MCF_MMU_MMUTR_ID(x) (((x) & 0xFF) << 0x2) /* ASID (address space id) of page */
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#define MCF_MMU_MMUTR_VA(x) (((x) & 0x3FFFFF) << 0xA) /* virtual address of page */
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/* Bit definitions and macros for MCF_MMU_MMUDR */
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#define MCF_MMU_MMUDR_LK (0x2) /* lock page */
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#define MCF_MMU_MMUDR_X (0x4) /* allow code execution in memory page */
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#define MCF_MMU_MMUDR_W (0x8) /* allow write to memory page */
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#define MCF_MMU_MMUDR_R (0x10) /* allow read from memory page */
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#define MCF_MMU_MMUDR_SP (0x20) /* supervisor protect memory page */
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#define MCF_MMU_MMUDR_CM(x) (((x) & 0x3) << 0x6) /* cache mode */
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#define MCF_MMU_MMUDR_SZ(x) (((x) & 0x3) << 0x8) /* page size */
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#define MCF_MMU_MMUDR_PA(x) (((x) & 0x3FFFFF) << 0xA) /* page physical address */
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#define std_mmutr (MCF_MMU_MMUTR_SG | MCF_MMU_MMUTR_V)
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#define writethrough_mmudr (MCF_MMU_MMUDR_SZ(00) | MCF_MMU_MMUDR_CM(00) | MCF_MMU_MMUDR_R | MCF_MMU_MMUDR_W | MCF_MMU_MMUDR_X)
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#define copyback_mmudr (MCF_MMU_MMUDR_SZ(00) | MCF_MMU_MMUDR_CM(01) | MCF_MMU_MMUDR_R | MCF_MMU_MMUDR_W | MCF_MMU_MMUDR_X)
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/*
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*
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* General Purpose Timers (GPT)
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*
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* macros
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*/
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/* Register read/write macros */
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#define MCF_GPT0_GMS __MBAR+0x800
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/*
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*
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* Slice Timers (SLT)
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*
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*/
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#define MCF_SLT0_SCNT __MBAR+0x908
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/**********************************************************/
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// macros
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/**********************************************************/
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.altmacro
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.macro irq vector,int_mask,clr_int
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//move.w #0x2700,sr // disable interrupt
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move.w #0x2700,sr // disable interrupt
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subq.l #8,sp
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movem.l d0/a5,(sp) // save registers
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@@ -207,25 +152,6 @@
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rts
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.endm
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/*
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* FIXME: this is a GNU gas kludge. Ugly, but I just can't come up with any smarter solution
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*
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* GNU as does not support multi-character constants. At least I don't know of any way it would.
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* The following might look more than strange, but I considered the statement
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*
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* mchar move.l, 'T,'E,'S,'T,-(SP)
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*
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* somewhat more readable than
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*
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* move.l #1413829460,-(SP)
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*
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* If anybody knows of any better way on how to do this - please do!
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*
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*/
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.macro mchar st,a,b,c,d,tgt
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\st #\a << 24|\b<<16|\c<<8|\d,\tgt
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.endm
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.text
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_vec_init:
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move.l a2,-(sp) // Backup registers
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@@ -310,12 +236,12 @@ init_vec_loop:
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*/
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vector_table_start:
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std_exc_vec:
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//move.w #0x2700,sr // disable interrupt
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move.w #0x2700,sr // disable interrupt
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subq.l #8,sp
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movem.l d0/a5,(sp) // save registers
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move.w 8(sp),d0 // fetch vector
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and.l #0x3fc,d0 // mask out vector number
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#define DBG_EXC
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#ifdef DBG_EXC
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// printout vector number of exception
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@@ -323,16 +249,17 @@ std_exc_vec:
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movem.l d0-d1/a0-a1,(sp) // save gcc scratch registers
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lsr.l #2,d0 // shift vector number in place
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cmp.l #33,d0
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beq noprint
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cmp.l #34,d0
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cmp.l #33,d0 // do not debug-print various traps
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beq noprint // this would slow down interrupt
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cmp.l #34,d0 // processing enormously
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beq noprint
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cmp.l #45,d0
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beq noprint
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cmp.l #46,d0
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beq noprint
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move.l 4 * 4 + 8 + 4(sp),-(sp) // pc at exception
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move.l d0,-(sp) // provide it to xprintf()
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move.l d0,-(sp) // vector number
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pea exception_text
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jsr _xprintf // call xprintf()
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add.l #3*4,sp // adjust stack
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@@ -349,14 +276,15 @@ noprint:
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move.l 4(sp),a5 // restore a5
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move.l d0,4(sp) // store exception routine address
|
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|
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//move.w 10(sp),d0 // restore original SR
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//bset #13,d0 // set supervisor bit
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//move.w d0,sr //
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// FIXME: what does this do and why?
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move.w 10(sp),d0 // restore original SR
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bset #13,d0 // set supervisor bit
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move.w d0,sr //
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move.l (sp)+,d0 // restore d0
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rts // jump to exception routine
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exception_text:
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.ascii "DEBUG: EXCEPTION %d caught at %p"
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.ascii "DEBUG: EXCEPTION 0x%x caught at %p"
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.byte 13, 10, 0
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.align 4
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@@ -369,54 +297,28 @@ reset_vector:
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access:
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move.w #0x2700,sr // disable interrupts
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move.l d0,-(sp) // ++ vr
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move.w 4(sp),d0 // get format_status word from stack
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andi.l #0x0c03,d0 // mask out fault status bits
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cmpi.l #0x0401,d0 // TLB miss on opword of instruction fetch?
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beq access_mmu // yes
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cmpi.l #0x0402,d0 // TLB miss on extension word of instruction fetch?
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beq access_mmu // yes
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cmpi.l #0x0802,d0 // TLB miss on data write?
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beq access_mmu // yes
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cmpi.l #0x0c02,d0 // TLB miss on data read, or read-modify-write?
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beq access_mmu // yes
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link a6,#-4 * 4 // make room for gcc scratch registers
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movem.l d0-d1/a0-a1,(sp) // and save them
|
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|
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bra bus_error // everything else is a classic bus error
|
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move.l 4(a6),-(sp) // get format_status longword
|
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move.l 8(a6),-(sp) // PC at exception
|
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move.l MCF_MMU_MMUAR,-(sp) // fault address
|
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move.l MCF_MMU_MMUSR,-(sp) // MMU status register
|
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move.w #0x2300,sr // can lower interrupt mask once MMU status is safe
|
||||
jsr _mmutr_miss
|
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lea 4 * 4(sp),sp // adjust stack
|
||||
|
||||
access_mmu:
|
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move.l MCF_MMU_MMUSR,d0 // did the last fault hit in TLB?
|
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btst #1,d0 // yes, it did. So we already mapped that page
|
||||
bne bus_error // and this must be a real bus error
|
||||
btst #5,d0 // supervisor protection fault?
|
||||
bne bus_error
|
||||
btst #4,d0 // read access fault?
|
||||
bne bus_error
|
||||
btst #3,d0 // write access fault?
|
||||
tst.l d0 // exception handler signals bus error
|
||||
bne bus_error
|
||||
|
||||
move.l MCF_MMU_MMUAR,d0
|
||||
cmp.l #__FASTRAM_END,d0 // above max User RAM area?
|
||||
bge bus_error // -> bus error
|
||||
|
||||
lea -3 * 4(sp),sp // save gcc scratch registers
|
||||
movem.l d1/a0-a1,(sp)
|
||||
|
||||
move.l 3 * 4 + 4 (sp),-(sp) // push exception stack frame
|
||||
move.l 5 * 4 + 4 (sp),-(sp) // push program counter at exception
|
||||
move.l d0,-(sp) // fault address
|
||||
jsr _mmutr_miss // else we have an MMU TLB miss
|
||||
add.l #3 * 4,sp // adjust stack
|
||||
|
||||
movem.l (sp),d1/a0-a1 // restore gcc scratch registers
|
||||
lea 3 * 4(sp),sp
|
||||
|
||||
move.l (sp)+,d0 // restore register
|
||||
|
||||
movem.l (sp),d0-d1/a0-a1 // restore stack
|
||||
unlk a6
|
||||
rte
|
||||
|
||||
bus_error:
|
||||
move.l (sp)+,d0 // restore register
|
||||
movem.l (sp),d0-d1/a0-a1
|
||||
unlk a6
|
||||
bra std_exc_vec
|
||||
|
||||
zero_divide:
|
||||
@@ -543,79 +445,6 @@ irq6: // MFP interrupt from FPGA
|
||||
lea MCF_EPORT_EPFR,a5 // clear int6 from edge port
|
||||
bset #6,(a5)
|
||||
|
||||
// screen adr change timed out?
|
||||
move.l _video_sbt,d0
|
||||
beq irq6_non_sca // nothing to do if 0
|
||||
|
||||
sub.l #0x70000000,d0 // substract 14 seconds
|
||||
lea MCF_SLT0_SCNT,a5
|
||||
cmp.l (a5),d0 // time reached?
|
||||
ble irq6_non_sca // not yet
|
||||
|
||||
lea -7 * 4(sp),sp // save more registers
|
||||
movem.l d0-d4/a0-a1,(sp) //
|
||||
clr.l d3 // beginn mit 0
|
||||
// jsr _flush_and_invalidate_caches FIXME: why should we need that?
|
||||
|
||||
// eintrag suchen
|
||||
irq6_next_sca:
|
||||
move.l d3,d0
|
||||
move.l d0,MCF_MMU_MMUAR // addresse
|
||||
move.l #0x106,d4
|
||||
move.l d4,MCF_MMU_MMUOR // suchen ->
|
||||
nop
|
||||
move.l MCF_MMU_MMUOR,d4
|
||||
clr.w d4
|
||||
swap d4
|
||||
move.l d4,MCF_MMU_MMUAR
|
||||
mvz.w #0x10e,d4
|
||||
move.l d4,MCF_MMU_MMUOR // einträge holen aus mmu
|
||||
nop
|
||||
move.l MCF_MMU_MMUTR,d4 // ID holen
|
||||
lsr.l #2,d4 // bit 9 bis 2
|
||||
cmp.w #sca_page_ID,d4 // ist screen change ID?
|
||||
bne irq6_sca_pn // nein -> page keine screen area next
|
||||
// eintrag <EFBFBD>ndern
|
||||
add.l #std_mmutr,d0
|
||||
move.l d3,d1 // page 0?
|
||||
beq irq6_sca_pn0 // ja ->
|
||||
add.l #copyback_mmudr,d1 // sonst page cb
|
||||
bra irq6_sca_pn1c
|
||||
irq6_sca_pn0:
|
||||
add.l #writethrough_mmudr/*|MCF_MMU_MMUDR_LK*/,d1 // page wt and locked
|
||||
irq6_sca_pn1c:
|
||||
mvz.w #0x10b,d2 // MMU update
|
||||
move.l d0,MCF_MMU_MMUTR
|
||||
move.l d1,MCF_MMU_MMUDR
|
||||
move.l d2,MCF_MMU_MMUOR // setze tlb data only
|
||||
nop
|
||||
// page copy
|
||||
move.l d3,a0
|
||||
add.l #0x60000000,a0
|
||||
move.l d3,a1
|
||||
move.l #0x10000,d4 // one whole page (1 MB)
|
||||
|
||||
|
||||
irq6_vcd0_loop:
|
||||
move.l (a0)+,(a1)+ // page copy
|
||||
move.l (a0)+,(a1)+
|
||||
move.l (a0)+,(a1)+
|
||||
move.l (a0)+,(a1)+
|
||||
subq.l #1,d4
|
||||
bne irq6_vcd0_loop
|
||||
|
||||
irq6_sca_pn:
|
||||
add.l #0x00100000,d3 // next
|
||||
cmp.l #0x00d00000,d3 // ende?
|
||||
blt irq6_next_sca // nein->
|
||||
|
||||
move.l #0x2000,d0
|
||||
move.l d0,_video_tlb // anfangszustand wieder herstellen
|
||||
clr.l _video_sbt // zeit löschen
|
||||
|
||||
movem.l (sp),d0-d4/a0-a1 // restore registers
|
||||
lea 7 * 4(sp),sp
|
||||
|
||||
irq6_non_sca:
|
||||
// test auf acsi dma -----------------------------------------------------------------
|
||||
lea 0xfffffa0b,a5
|
||||
@@ -666,10 +495,6 @@ acsi_dma: // atari dma
|
||||
move.l d1,-(sp)
|
||||
|
||||
lea MCF_PSC0_PSCTB_8BIT,a1 // ++ vr
|
||||
mchar move.l, 'D,'M','A,'\ ,(a1)
|
||||
//move.l #"DMA ",(a1)
|
||||
mchar move.l,'I,'N,'T,'!,(a1)
|
||||
// move.l #'INT!',(a1)
|
||||
|
||||
lea 0xf0020110,a5 // fifo daten
|
||||
acsi_dma_start:
|
||||
@@ -752,7 +577,10 @@ irq7:
|
||||
*
|
||||
* GPT0 is used as input trigger. It is connected to the TIN0 signal of
|
||||
* the FPGA and triggers everytime vbasehi is written to, i.e.
|
||||
* when the video base address gets changed
|
||||
* when the video base address gets changed. In the "MiNT-compatible MMU"-version this
|
||||
* doesn't do anything, currently, but
|
||||
* TODO: could be used for e.g. activating copyback cache mode on those ST-RAM pages
|
||||
* that aren't video pages.
|
||||
*/
|
||||
|
||||
|
||||
@@ -763,11 +591,13 @@ handler_gpt0:
|
||||
link a6,#-4 * 4 // make room for
|
||||
movem.l d0-d1/a0-a1,(sp) // gcc scratch registers and save them,
|
||||
// other registers will be handled by gcc itself
|
||||
|
||||
move.w 4(a6),d0 // fetch vector number from stack
|
||||
move.l d0,-(sp) // push it
|
||||
jsr _gpt0_interrupt_handler // call C handler
|
||||
addq.l #4,sp // adjust stack
|
||||
|
||||
movem.l (sp),d0-d1/a0-a1 // restore registers
|
||||
|
||||
unlk a6
|
||||
rte
|
||||
#endif /* MACHINE_FIREBEE */
|
||||
|
||||
102
sys/interrupts.c
102
sys/interrupts.c
@@ -430,110 +430,8 @@ bool irq6_interrupt_handler(uint32_t sf1, uint32_t sf2)
|
||||
*/
|
||||
void gpt0_interrupt_handler(void)
|
||||
{
|
||||
uint32_t video_address;
|
||||
uint32_t video_end_address;
|
||||
int page_number;
|
||||
bool already_set;
|
||||
extern uint32_t _STRAM_END;
|
||||
|
||||
dbg("screen base = 0x%x\r\n", vbasehi);
|
||||
|
||||
if (vbasehi < 2) /* screen base lower than 0x20000? */
|
||||
{
|
||||
goto rearm_trigger; /* do nothing */
|
||||
}
|
||||
else if (vbasehi >= 0xd0) /* higher than 0xd00000 (normal Falcon address)? */
|
||||
{
|
||||
video_sbt = MCF_SLT0_SCNT; /* FIXME: no idea why we need to save the time here */
|
||||
}
|
||||
video_address = (vbasehi << 16) | (vbasemid << 8) | vbaselow;
|
||||
|
||||
page_number = video_address >> 20; /* calculate a page number */
|
||||
already_set = (video_tlb & (1 << page_number)); /* already in bitset? */
|
||||
video_tlb |= page_number; /* set it */
|
||||
|
||||
if (! already_set) /* newly set page, need to copy contents */
|
||||
{
|
||||
flush_and_invalidate_caches();
|
||||
dma_memcpy((uint8_t *) video_address + 0x60000000, (uint8_t *) video_address, 0x100000);
|
||||
|
||||
/*
|
||||
* create an MMU TLB entry for the new video page
|
||||
*/
|
||||
|
||||
/*
|
||||
* first search for an existing entry with our address. If none is found,
|
||||
* the MMU will propose a new one
|
||||
*/
|
||||
MCF_MMU_MMUAR = video_address;
|
||||
MCF_MMU_MMUOR = 0x106;
|
||||
NOP();
|
||||
|
||||
/*
|
||||
* take this MMU TLB entry and set it to our video address and page mapping
|
||||
*/
|
||||
MCF_MMU_MMUAR = (MCF_MMU_MMUOR >> 16) & 0xffff; /* set TLB id */
|
||||
|
||||
MCF_MMU_MMUTR = video_address |
|
||||
MCF_MMU_MMUTR_ID(sca_page_ID) | /* set video page ID */
|
||||
MCF_MMU_MMUTR_SG | /* shared global */
|
||||
MCF_MMU_MMUTR_V; /* valid */
|
||||
MCF_MMU_MMUDR = (video_address + 0x60000000) | /* physical address */
|
||||
MCF_MMU_MMUDR_SZ(0) | /* 1 MB page size */
|
||||
MCF_MMU_MMUDR_CM(0) | /* writethrough */
|
||||
MCF_MMU_MMUDR_R | /* readable */
|
||||
MCF_MMU_MMUDR_W | /* writeable */
|
||||
MCF_MMU_MMUDR_X; /* executable */
|
||||
MCF_MMU_MMUOR = 0x10b; /* update TLB entry */
|
||||
}
|
||||
|
||||
/*
|
||||
* Calculate the effective screen memory size to see if we need to map another page
|
||||
* in case the new screen spans more than one single page
|
||||
*/
|
||||
video_end_address = video_address + (vde - vdb) * vwrap;
|
||||
if (video_end_address < _STRAM_END)
|
||||
{
|
||||
page_number = video_end_address >> 20; /* calculate a page number */
|
||||
already_set = (video_tlb & (1 << page_number)); /* already in bitset? */
|
||||
video_tlb |= page_number; /* set it */
|
||||
|
||||
if (! already_set) /* newly set page, need to copy contents */
|
||||
{
|
||||
flush_and_invalidate_caches();
|
||||
dma_memcpy((uint8_t *) video_end_address + 0x60000000, (uint8_t *) video_end_address, 0x100000);
|
||||
|
||||
/*
|
||||
* create an MMU TLB entry for the new video page
|
||||
*/
|
||||
|
||||
/*
|
||||
* first search for an existing entry with our address. If none is found,
|
||||
* the MMU will propose a new one
|
||||
*/
|
||||
MCF_MMU_MMUAR = video_end_address;
|
||||
MCF_MMU_MMUOR = 0x106;
|
||||
NOP();
|
||||
|
||||
/*
|
||||
* take this MMU TLB entry and set it to our video address and page mapping
|
||||
*/
|
||||
MCF_MMU_MMUAR = (MCF_MMU_MMUOR >> 16) & 0xffff; /* set TLB id */
|
||||
|
||||
MCF_MMU_MMUTR = video_end_address |
|
||||
MCF_MMU_MMUTR_ID(sca_page_ID) | /* set video page ID */
|
||||
MCF_MMU_MMUTR_SG | /* shared global */
|
||||
MCF_MMU_MMUTR_V; /* valid */
|
||||
MCF_MMU_MMUDR = (video_end_address + 0x60000000) | /* physical address */
|
||||
MCF_MMU_MMUDR_SZ(0) | /* 1 MB page size */
|
||||
MCF_MMU_MMUDR_CM(0) | /* writethrough */
|
||||
MCF_MMU_MMUDR_R | /* readable */
|
||||
MCF_MMU_MMUDR_W | /* writeable */
|
||||
MCF_MMU_MMUDR_X; /* executable */
|
||||
MCF_MMU_MMUOR = 0x10b; /* update TLB entry */
|
||||
}
|
||||
}
|
||||
rearm_trigger:
|
||||
MCF_GPT0_GMS &= ~1; /* rearm trigger */
|
||||
NOP();
|
||||
MCF_GPT0_GMS |= 1;
|
||||
|
||||
505
sys/mmu.c
505
sys/mmu.c
@@ -1,5 +1,6 @@
|
||||
#include "mmu.h"
|
||||
#include "acia.h"
|
||||
#include "exceptions.h"
|
||||
|
||||
/*
|
||||
* mmu.c
|
||||
@@ -62,12 +63,14 @@
|
||||
#error "unknown machine!"
|
||||
#endif /* MACHINE_FIREBEE */
|
||||
|
||||
// #define DEBUG_MMU
|
||||
#ifdef DEBUG_MMU
|
||||
//#define DBG_MMU
|
||||
#ifdef DBG_MMU
|
||||
#define dbg(format, arg...) do { xprintf("DEBUG (%s()): " format, __FUNCTION__, ##arg);} while(0)
|
||||
#else
|
||||
#define dbg(format, arg...) do {;} while (0)
|
||||
#endif /* DEBUG_MMU */
|
||||
#endif /* DBG_MMU */
|
||||
#define err(format, arg...) do { xprintf("ERROR (%s()): " format, __FUNCTION__, ##arg); xprintf("system halted\r\n"); } while(0); while(1)
|
||||
|
||||
|
||||
/*
|
||||
* set ASID register
|
||||
@@ -82,7 +85,7 @@ inline uint32_t set_asid(uint32_t value)
|
||||
"movec %[value],ASID\n\t"
|
||||
: /* no output */
|
||||
: [value] "r" (value)
|
||||
:
|
||||
: "memory"
|
||||
);
|
||||
|
||||
rt_asid = value;
|
||||
@@ -104,7 +107,7 @@ inline uint32_t set_acr0(uint32_t value)
|
||||
"movec %[value],ACR0\n\t"
|
||||
: /* not output */
|
||||
: [value] "r" (value)
|
||||
:
|
||||
: "memory"
|
||||
);
|
||||
rt_acr0 = value;
|
||||
|
||||
@@ -124,7 +127,7 @@ inline uint32_t set_acr1(uint32_t value)
|
||||
"movec %[value],ACR1\n\t"
|
||||
: /* not output */
|
||||
: [value] "r" (value)
|
||||
:
|
||||
: "memory"
|
||||
);
|
||||
rt_acr1 = value;
|
||||
|
||||
@@ -145,7 +148,7 @@ inline uint32_t set_acr2(uint32_t value)
|
||||
"movec %[value],ACR2\n\t"
|
||||
: /* not output */
|
||||
: [value] "r" (value)
|
||||
:
|
||||
: "memory"
|
||||
);
|
||||
rt_acr2 = value;
|
||||
|
||||
@@ -165,7 +168,7 @@ inline uint32_t set_acr3(uint32_t value)
|
||||
"movec %[value],ACR3\n\t"
|
||||
: /* not output */
|
||||
: [value] "r" (value)
|
||||
:
|
||||
: "memory"
|
||||
);
|
||||
rt_acr3 = value;
|
||||
|
||||
@@ -181,7 +184,7 @@ inline uint32_t set_mmubar(uint32_t value)
|
||||
"movec %[value],MMUBAR\n\t"
|
||||
: /* no output */
|
||||
: [value] "r" (value)
|
||||
: /* no clobber */
|
||||
: "memory"
|
||||
);
|
||||
rt_mmubar = value;
|
||||
NOP();
|
||||
@@ -189,6 +192,218 @@ inline uint32_t set_mmubar(uint32_t value)
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* translation table for virtual address ranges. Holds the physical_offset (which must be added to a virtual
|
||||
* address to get its physical counterpart) for memory ranges.
|
||||
*/
|
||||
struct virt_to_phys
|
||||
{
|
||||
uint32_t start_address;
|
||||
uint32_t length;
|
||||
uint32_t physical_offset;
|
||||
};
|
||||
|
||||
static struct virt_to_phys translation[] =
|
||||
{
|
||||
/* virtual , length , offset */
|
||||
{ 0x00000000, 0x00e00000, 0x60000000 }, /* map first 14 MByte to first 14 Mb of video ram */
|
||||
{ 0x00e00000, 0x00100000, 0x00000000 }, /* map TOS to SDRAM */
|
||||
{ 0x00f00000, 0x00100000, 0xff000000 }, /* map Falcon I/O area to FPGA */
|
||||
{ 0x01000000, 0x1f000000, 0x00000000 }, /* map rest of ram virt = phys */
|
||||
};
|
||||
static int num_translations = sizeof(translation) / sizeof(struct virt_to_phys);
|
||||
|
||||
static inline uint32_t lookup_phys(uint32_t virt)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < num_translations; i++)
|
||||
{
|
||||
if (virt >= translation[i].start_address && virt < translation[i].start_address + translation[i].length)
|
||||
{
|
||||
return virt + translation[i].physical_offset;
|
||||
}
|
||||
}
|
||||
err("virtual address 0x%lx not found in translation table!\r\n", virt);
|
||||
return -1;
|
||||
}
|
||||
|
||||
struct page_descriptor
|
||||
{
|
||||
uint8_t cache_mode : 2;
|
||||
uint8_t supervisor_protect : 1;
|
||||
uint8_t read : 1;
|
||||
uint8_t write : 1;
|
||||
uint8_t execute : 1;
|
||||
uint8_t global : 1;
|
||||
uint8_t locked : 1;
|
||||
};
|
||||
|
||||
static struct page_descriptor pages[65536]; /* 512 Mb RAM */
|
||||
|
||||
/*
|
||||
* map a page of memory using virt addresses with the Coldfire MMU.
|
||||
*
|
||||
* Theory of operation: the Coldfire MMU in the Firebee has 64 TLB entries, 32 for data (DTLB), 32 for
|
||||
* instructions (ITLB). Mappings can either be done locked (normal MMU TLB misses will not consider them
|
||||
* for replacement) or unlocked (mappings will reallocate using a LRU scheme when the MMU runs out of
|
||||
* TLB entries). For proper operation, the MMU needs at least two ITLBs and/or four free/allocatable DTLBs
|
||||
* per instruction as a minimum, more for performance. Thus locked pages (that can't be touched by the
|
||||
* LRU algorithm) should be used sparsingly.
|
||||
*
|
||||
*
|
||||
*/
|
||||
int mmu_map_8k_page(uint32_t virt, uint8_t asid)
|
||||
{
|
||||
const uint32_t size_mask = 0xffffe000; /* 8k pagesize */
|
||||
int page_index = (virt & size_mask) / DEFAULT_PAGE_SIZE; /* index into page_descriptor array */
|
||||
struct page_descriptor *page = &pages[page_index]; /* attributes of page to map */
|
||||
|
||||
uint32_t phys = lookup_phys(virt); /* virtual to physical translation of page */
|
||||
|
||||
if (phys == -1)
|
||||
return 0;
|
||||
|
||||
#ifdef DBG_MMU
|
||||
register int sp asm("sp");
|
||||
dbg("page_descriptor: 0x%02x, ssp = 0x%08x\r\n", * (uint8_t *) page, sp);
|
||||
#endif /* DBG_MMU */
|
||||
/*
|
||||
* add page to TLB
|
||||
*/
|
||||
MCF_MMU_MMUTR = (virt & 0xfffffc00) | /* virtual address */
|
||||
MCF_MMU_MMUTR_ID(asid) | /* address space id (ASID) */
|
||||
(page->global ? MCF_MMU_MMUTR_SG : 0) | /* shared global */
|
||||
MCF_MMU_MMUTR_V; /* valid */
|
||||
|
||||
MCF_MMU_MMUDR = (phys & 0xfffffc00) | /* physical address */
|
||||
MCF_MMU_MMUDR_SZ(MMU_PAGE_SIZE_8K) | /* page size */
|
||||
MCF_MMU_MMUDR_CM(page->cache_mode) | /* cache mode */
|
||||
(page->supervisor_protect ? MCF_MMU_MMUDR_SP : 0) | /* supervisor protect */
|
||||
(page->read ? MCF_MMU_MMUDR_R : 0) | /* read access enable */
|
||||
(page->write ? MCF_MMU_MMUDR_W : 0) | /* write access enable */
|
||||
(page->execute ? MCF_MMU_MMUDR_X : 0) | /* execute access enable */
|
||||
(page->locked ? MCF_MMU_MMUDR_LK : 0);
|
||||
|
||||
MCF_MMU_MMUOR = MCF_MMU_MMUOR_ITLB | /* instruction */
|
||||
MCF_MMU_MMUOR_ACC | /* access TLB */
|
||||
MCF_MMU_MMUOR_UAA; /* update allocation address field */
|
||||
dbg("ITLB: MCF_MMU_MMUOR = %08x\r\n", MCF_MMU_MMUOR);
|
||||
|
||||
MCF_MMU_MMUOR = MCF_MMU_MMUOR_ACC | /* access TLB, data */
|
||||
MCF_MMU_MMUOR_UAA; /* update allocation address field */
|
||||
|
||||
dbg("mapped virt=0x%08x to phys=0x%08x\r\n", virt & size_mask, phys & size_mask);
|
||||
|
||||
dbg("DTLB: MCF_MMU_MMUOR = %08x\r\n", MCF_MMU_MMUOR);
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
int mmu_map_8k_instruction_page(uint32_t virt, uint8_t asid)
|
||||
{
|
||||
const uint32_t size_mask = ~ (DEFAULT_PAGE_SIZE - 1); /* 8k pagesize */
|
||||
int page_index = (virt & size_mask) / DEFAULT_PAGE_SIZE; /* index into page_descriptor array */
|
||||
struct page_descriptor *page = &pages[page_index]; /* attributes of page to map */
|
||||
int ipl;
|
||||
uint32_t phys = lookup_phys(virt); /* virtual to physical translation of page */
|
||||
|
||||
if (phys == -1)
|
||||
return 0;
|
||||
|
||||
#ifdef DBG_MMU
|
||||
register int sp asm("sp");
|
||||
dbg("page_descriptor: 0x%02x, ssp = 0x%08x\r\n", * (uint8_t *) page, sp);
|
||||
#endif /* DBG_MMU */
|
||||
|
||||
/*
|
||||
* add page to TLB
|
||||
*/
|
||||
|
||||
ipl = set_ipl(7); /* do not disturb */
|
||||
|
||||
MCF_MMU_MMUAR = (virt & size_mask);
|
||||
|
||||
MCF_MMU_MMUTR = (virt & size_mask) | /* virtual address */
|
||||
MCF_MMU_MMUTR_ID(asid) | /* address space id (ASID) */
|
||||
(page->global ? MCF_MMU_MMUTR_SG : 0) | /* shared global */
|
||||
MCF_MMU_MMUTR_V; /* valid */
|
||||
|
||||
__asm__ __volatile("" : : : "memory"); /* MMU commands must be exactly in sequence */
|
||||
|
||||
MCF_MMU_MMUDR = (phys & size_mask) | /* physical address */
|
||||
MCF_MMU_MMUDR_SZ(MMU_PAGE_SIZE_8K) | /* page size */
|
||||
MCF_MMU_MMUDR_CM(page->cache_mode) | /* cache mode */
|
||||
(page->supervisor_protect ? MCF_MMU_MMUDR_SP : 0) | /* supervisor protect */
|
||||
(page->read ? MCF_MMU_MMUDR_R : 0) | /* read access enable */
|
||||
(page->write ? MCF_MMU_MMUDR_W : 0) | /* write access enable */
|
||||
(page->execute ? MCF_MMU_MMUDR_X : 0) | /* execute access enable */
|
||||
(page->locked ? MCF_MMU_MMUDR_LK : 0);
|
||||
|
||||
__asm__ __volatile("" : : : "memory"); /* MMU commands must be exactly in sequence */
|
||||
|
||||
MCF_MMU_MMUOR = MCF_MMU_MMUOR_ITLB | /* instruction */
|
||||
MCF_MMU_MMUOR_ACC | /* access TLB */
|
||||
MCF_MMU_MMUOR_UAA; /* update allocation address field */
|
||||
|
||||
__asm__ __volatile("" : : : "memory"); /* MMU commands must be exactly in sequence */
|
||||
|
||||
set_ipl(ipl);
|
||||
|
||||
dbg("mapped virt=0x%08x to phys=0x%08x\r\n", virt & size_mask, phys & size_mask);
|
||||
|
||||
dbg("ITLB: MCF_MMU_MMUOR = %08x\r\n", MCF_MMU_MMUOR);
|
||||
return 1;
|
||||
}
|
||||
|
||||
int mmu_map_8k_data_page(uint32_t virt, uint8_t asid)
|
||||
{
|
||||
uint16_t ipl;
|
||||
const uint32_t size_mask = ~ (DEFAULT_PAGE_SIZE - 1); /* 8k pagesize */
|
||||
int page_index = (virt & size_mask) / DEFAULT_PAGE_SIZE; /* index into page_descriptor array */
|
||||
struct page_descriptor *page = &pages[page_index]; /* attributes of page to map */
|
||||
|
||||
uint32_t phys = lookup_phys(virt); /* virtual to physical translation of page */
|
||||
|
||||
if (phys == -1)
|
||||
return 0;
|
||||
|
||||
#ifdef DBG_MMU
|
||||
register int sp asm("sp");
|
||||
dbg("page_descriptor: 0x%02x, ssp = 0x%08x\r\n", * (uint8_t *) page, sp);
|
||||
#endif /* DBG_MMU */
|
||||
|
||||
/*
|
||||
* add page to TLB
|
||||
*/
|
||||
|
||||
ipl = set_ipl(7); /* do not disturb */
|
||||
|
||||
MCF_MMU_MMUTR = (virt & size_mask) | /* virtual address */
|
||||
MCF_MMU_MMUTR_ID(asid) | /* address space id (ASID) */
|
||||
(page->global ? MCF_MMU_MMUTR_SG : 0) | /* shared global */
|
||||
MCF_MMU_MMUTR_V; /* valid */
|
||||
|
||||
MCF_MMU_MMUDR = (phys & size_mask) | /* physical address */
|
||||
MCF_MMU_MMUDR_SZ(MMU_PAGE_SIZE_8K) | /* page size */
|
||||
MCF_MMU_MMUDR_CM(page->cache_mode) | /* cache mode */
|
||||
(page->supervisor_protect ? MCF_MMU_MMUDR_SP : 0) | /* supervisor protect */
|
||||
(page->read ? MCF_MMU_MMUDR_R : 0) | /* read access enable */
|
||||
(page->write ? MCF_MMU_MMUDR_W : 0) | /* write access enable */
|
||||
(page->execute ? MCF_MMU_MMUDR_X : 0) | /* execute access enable */
|
||||
(page->locked ? MCF_MMU_MMUDR_LK : 0);
|
||||
|
||||
MCF_MMU_MMUOR = MCF_MMU_MMUOR_ACC | /* access TLB, data */
|
||||
MCF_MMU_MMUOR_UAA; /* update allocation address field */
|
||||
|
||||
set_ipl(ipl);
|
||||
dbg("mapped virt=0x%08x to phys=0x%08x\r\n", virt & size_mask, phys & size_mask);
|
||||
|
||||
dbg("DTLB: MCF_MMU_MMUOR = %08x\r\n", MCF_MMU_MMUOR);
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* map a page of memory using virt and phys as addresses with the Coldfire MMU.
|
||||
*
|
||||
@@ -201,48 +416,51 @@ inline uint32_t set_mmubar(uint32_t value)
|
||||
*
|
||||
*
|
||||
*/
|
||||
int mmu_map_page(uint32_t virt, uint32_t phys, enum mmu_page_size sz, const struct mmu_map_flags *flags)
|
||||
int mmu_map_page(uint32_t virt, uint32_t phys, enum mmu_page_size sz, uint8_t page_id, const struct page_descriptor *flags)
|
||||
{
|
||||
int size_mask;
|
||||
int ipl;
|
||||
|
||||
switch (sz)
|
||||
{
|
||||
case MMU_PAGE_SIZE_1M:
|
||||
size_mask = 0xfff00000;
|
||||
size_mask = ~ (0x00010000 - 1);
|
||||
break;
|
||||
|
||||
case MMU_PAGE_SIZE_8K:
|
||||
size_mask = 0xffffe000;
|
||||
size_mask = ~ (0x2000 - 1);
|
||||
break;
|
||||
|
||||
case MMU_PAGE_SIZE_4K:
|
||||
size_mask = 0xfffff000;
|
||||
size_mask = ~ (0x1000 - 1);
|
||||
break;
|
||||
|
||||
case MMU_PAGE_SIZE_1K:
|
||||
size_mask = 0xfffff800;
|
||||
size_mask = ~ (0x400 - 1);
|
||||
break;
|
||||
|
||||
default:
|
||||
dbg("illegal map size %d\r\n", sz);
|
||||
return 0;
|
||||
err("illegal map size %d\r\n", sz);
|
||||
}
|
||||
|
||||
/*
|
||||
* add page to TLB
|
||||
*/
|
||||
MCF_MMU_MMUTR = ((int) virt & size_mask) | /* virtual address */
|
||||
MCF_MMU_MMUTR_ID(flags->page_id) | /* address space id (ASID) */
|
||||
MCF_MMU_MMUTR_SG | /* shared global */
|
||||
|
||||
ipl = set_ipl(7);
|
||||
|
||||
MCF_MMU_MMUTR = ((uint32_t) virt & size_mask) | /* virtual address */
|
||||
MCF_MMU_MMUTR_ID(page_id) | /* address space id (ASID) */
|
||||
(flags->global ? MCF_MMU_MMUTR_SG : 0) | /* shared global */
|
||||
MCF_MMU_MMUTR_V; /* valid */
|
||||
NOP();
|
||||
|
||||
MCF_MMU_MMUDR = ((int) phys & size_mask) | /* physical address */
|
||||
MCF_MMU_MMUDR = ((uint32_t) phys & size_mask) | /* physical address */
|
||||
MCF_MMU_MMUDR_SZ(sz) | /* page size */
|
||||
MCF_MMU_MMUDR_CM(flags->cache_mode) |
|
||||
(flags->access & ACCESS_READ ? MCF_MMU_MMUDR_R : 0) | /* read access enable */
|
||||
(flags->access & ACCESS_WRITE ? MCF_MMU_MMUDR_W : 0) | /* write access enable */
|
||||
(flags->access & ACCESS_EXECUTE ? MCF_MMU_MMUDR_X : 0) | /* execute access enable */
|
||||
(flags->read ? MCF_MMU_MMUDR_R : 0) | /* read access enable */
|
||||
(flags->write ? MCF_MMU_MMUDR_W : 0) | /* write access enable */
|
||||
(flags->execute ? MCF_MMU_MMUDR_X : 0) | /* execute access enable */
|
||||
(flags->locked ? MCF_MMU_MMUDR_LK : 0);
|
||||
NOP();
|
||||
|
||||
@@ -253,6 +471,9 @@ int mmu_map_page(uint32_t virt, uint32_t phys, enum mmu_page_size sz, const stru
|
||||
MCF_MMU_MMUOR = MCF_MMU_MMUOR_ITLB | /* instruction */
|
||||
MCF_MMU_MMUOR_ACC | /* access TLB */
|
||||
MCF_MMU_MMUOR_UAA; /* update allocation address field */
|
||||
|
||||
set_ipl(ipl);
|
||||
|
||||
dbg("mapped virt=0x%08x to phys=0x%08x\r\n", virt, phys);
|
||||
|
||||
return 1;
|
||||
@@ -260,19 +481,74 @@ int mmu_map_page(uint32_t virt, uint32_t phys, enum mmu_page_size sz, const stru
|
||||
|
||||
void mmu_init(void)
|
||||
{
|
||||
struct mmu_map_flags flags;
|
||||
|
||||
extern uint8_t _MMUBAR[];
|
||||
uint32_t MMUBAR = (uint32_t) &_MMUBAR[0];
|
||||
extern uint8_t _TOS[];
|
||||
uint32_t TOS = (uint32_t) &_TOS[0];
|
||||
struct page_descriptor flags;
|
||||
int i;
|
||||
|
||||
/*
|
||||
* clear all MMU TLB entries first
|
||||
*/
|
||||
MCF_MMU_MMUOR = MCF_MMU_MMUOR_CA; /* clears _all_ TLBs (including locked ones) */
|
||||
NOP();
|
||||
|
||||
/*
|
||||
* prelaminary initialization of page descriptor 0 (root) table
|
||||
*/
|
||||
for (i = 0; i < sizeof(pages) / sizeof(struct page_descriptor); i++)
|
||||
{
|
||||
uint32_t addr = i * DEFAULT_PAGE_SIZE;
|
||||
|
||||
if (addr >= 0x00f00000 && addr < 0x00ffffff)
|
||||
{
|
||||
pages[i].cache_mode = CACHE_NOCACHE_PRECISE;
|
||||
pages[i].execute = 0;
|
||||
pages[i].read = 1;
|
||||
pages[i].write = 1;
|
||||
pages[i].execute = 0;
|
||||
pages[i].global = 1;
|
||||
pages[i].supervisor_protect = 1;
|
||||
}
|
||||
else if (addr >= 0x0 && addr < 0x00e00000) /* ST-RAM, potential video memory */
|
||||
{
|
||||
pages[i].cache_mode = CACHE_WRITETHROUGH;
|
||||
pages[i].execute = 1;
|
||||
pages[i].supervisor_protect = 0;
|
||||
pages[i].read = 1;
|
||||
pages[i].write = 1;
|
||||
pages[i].execute = 1;
|
||||
pages[i].global = 1;
|
||||
}
|
||||
else if (addr >= 0x00e00000 && addr < 0x00f00000) /* EmuTOS */
|
||||
{
|
||||
pages[i].cache_mode = CACHE_COPYBACK;
|
||||
pages[i].execute = 1;
|
||||
pages[i].supervisor_protect = 1;
|
||||
pages[i].read = 1;
|
||||
pages[i].write = 0;
|
||||
pages[i].execute = 1;
|
||||
pages[i].global = 1;
|
||||
}
|
||||
else
|
||||
{
|
||||
pages[i].cache_mode = CACHE_COPYBACK;
|
||||
pages[i].execute = 1;
|
||||
pages[i].read = 1;
|
||||
pages[i].write = 1;
|
||||
pages[i].supervisor_protect = 0;
|
||||
pages[i].global = 1;
|
||||
}
|
||||
pages[i].locked = 0; /* not locked */
|
||||
pages[0].supervisor_protect = 0; /* protect system vectors */
|
||||
}
|
||||
|
||||
set_asid(0); /* do not use address extension (ASID provides virtual 48 bit addresses) yet */
|
||||
|
||||
set_asid(0); /* do not use address extension (ASID provides virtual 48 bit addresses */
|
||||
|
||||
/* set data access attributes in ACR0 and ACR1 */
|
||||
set_acr0(ACR_W(0) | /* read and write accesses permitted */
|
||||
ACR_SP(0) | /* supervisor and user mode access permitted */
|
||||
ACR_CM(ACR_CM_CACHE_INH_PRECISE) | /* cache inhibit, precise */
|
||||
ACR_CM(ACR_CM_CACHE_INH_PRECISE) | /* cache inhibit, precise (i/o area!) */
|
||||
ACR_AMM(0) | /* control region > 16 MB */
|
||||
ACR_S(ACR_S_ALL) | /* match addresses in user and supervisor mode */
|
||||
ACR_E(1) | /* enable ACR */
|
||||
@@ -284,43 +560,49 @@ void mmu_init(void)
|
||||
ACR_BA(0x80000000));
|
||||
#elif defined(MACHINE_M54455)
|
||||
ACR_ADMSK(0x7f) |
|
||||
ACR_BA(0x80000000)); /* FIXME: not determined yet */
|
||||
ACR_BA(0x80000000)); /* FIXME: not determined yet for this machine */
|
||||
#else
|
||||
#error unknown machine!
|
||||
#endif /* MACHINE_FIREBEE */
|
||||
|
||||
|
||||
|
||||
// set_acr1(0x601fc000);
|
||||
set_acr1(ACR_W(0) |
|
||||
ACR_SP(0) |
|
||||
ACR_CM(0) |
|
||||
#if defined(MACHINE_FIREBEE)
|
||||
ACR_CM(ACR_CM_CACHEABLE_WT) | /* video RAM on the Firebee */
|
||||
ACR_CM(ACR_CM_CACHE_INH_PRECISE) | /* ST RAM on the Firebee */
|
||||
#elif defined(MACHINE_M5484LITE)
|
||||
ACR_CM(ACR_CM_CACHE_INH_PRECISE) | /* Compact Flash on the M548xLITE */
|
||||
#elif defined(MACHINE_M54455)
|
||||
ACR_CM(ACR_CM_CACHE_INH_PRECISE) | /* FIXME: not determined yet */
|
||||
ACR_CM(ACR_CM_CACHE_INH_PRECISE) | /* FIXME: not determined yet for this machine */
|
||||
#else
|
||||
#error unknown machine!
|
||||
#endif /* MACHINE_FIREBEE */
|
||||
ACR_AMM(0) |
|
||||
ACR_S(ACR_S_ALL) |
|
||||
ACR_E(1) |
|
||||
ACR_ADMSK(0x1f) |
|
||||
ACR_BA(0x60000000));
|
||||
ACR_ADMSK(0x7f) |
|
||||
ACR_BA(0x00100000));
|
||||
|
||||
#ifdef _NOT_USED_
|
||||
/* set instruction access attributes in ACR2 and ACR3 */
|
||||
|
||||
//set_acr2(0xe007c400);
|
||||
//set_acr2(0xe007c400); /* flash area */
|
||||
set_acr2(ACR_W(0) |
|
||||
ACR_SP(0) |
|
||||
ACR_CM(0) |
|
||||
ACR_CM(ACR_CM_CACHEABLE_WT) |
|
||||
ACR_CM(ACR_CM_CACHE_INH_PRECISE) |
|
||||
ACR_AMM(1) |
|
||||
ACR_S(ACR_S_ALL) |
|
||||
ACR_E(1) |
|
||||
ACR_ADMSK(0x7) |
|
||||
ACR_BA(0xe0000000));
|
||||
#endif /* _NOT_USED_ */
|
||||
|
||||
set_acr1(0x0);
|
||||
set_acr2(0x0);
|
||||
/* disable ACR3 */
|
||||
set_acr3(0x0);
|
||||
|
||||
@@ -331,103 +613,106 @@ void mmu_init(void)
|
||||
|
||||
/* create locked TLB entries */
|
||||
|
||||
flags.cache_mode = CACHE_COPYBACK;
|
||||
flags.protection = SV_USER;
|
||||
flags.page_id = 0;
|
||||
flags.access = ACCESS_READ | ACCESS_WRITE | ACCESS_EXECUTE;
|
||||
flags.locked = true;
|
||||
|
||||
/* 0x0000_0000 - 0x000F_FFFF (first MB of physical memory) locked virt = phys */
|
||||
mmu_map_page(0x0, 0x0, MMU_PAGE_SIZE_1M, &flags);
|
||||
|
||||
#if defined(MACHINE_FIREBEE)
|
||||
/*
|
||||
* 0x00d0'0000 - 0x00df'ffff (last megabyte of ST RAM = Falcon video memory) locked ID = 6
|
||||
* mapped to physical address 0x60d0'0000 (FPGA video memory)
|
||||
* video RAM: read write execute normal write true
|
||||
*/
|
||||
flags.cache_mode = CACHE_WRITETHROUGH;
|
||||
flags.protection = SV_USER;
|
||||
flags.page_id = SCA_PAGE_ID;
|
||||
flags.access = ACCESS_READ | ACCESS_WRITE | ACCESS_EXECUTE;
|
||||
flags.locked = true;
|
||||
mmu_map_page(0x00d00000, 0x60d00000, MMU_PAGE_SIZE_1M, &flags);
|
||||
|
||||
video_tlb = 0x2000; /* set page as video page */
|
||||
video_sbt = 0x0; /* clear time */
|
||||
#endif /* MACHINE_FIREBEE */
|
||||
|
||||
/*
|
||||
* Make the TOS (in SDRAM) read-only
|
||||
* This maps virtual 0x00e0'0000 - 0x00ef'ffff to the same virtual address
|
||||
*/
|
||||
flags.cache_mode = CACHE_COPYBACK;
|
||||
flags.page_id = 0;
|
||||
flags.access = ACCESS_READ | ACCESS_EXECUTE;
|
||||
mmu_map_page(TOS, TOS, MMU_PAGE_SIZE_1M, &flags);
|
||||
|
||||
#if defined(MACHINE_FIREBEE)
|
||||
/*
|
||||
* Map FireBee I/O area (0xfff0'0000 - 0xffff'ffff physical) to the Falcon-compatible I/O
|
||||
* area (0x00f0'0000 - 0x00ff'ffff virtual) for the FireBee
|
||||
*/
|
||||
flags.cache_mode = CACHE_NOCACHE_PRECISE;
|
||||
flags.access = ACCESS_WRITE | ACCESS_READ;
|
||||
mmu_map_page(0x00f00000, 0xfff00000, MMU_PAGE_SIZE_1M, &flags);
|
||||
#endif /* MACHINE_FIREBEE */
|
||||
|
||||
/*
|
||||
* Map (locked) the second last MB of physical SDRAM (this is where BaS .data and .bss reside) to the same
|
||||
* virtual address. This is also used (completely) when BaS is in RAM
|
||||
*/
|
||||
flags.cache_mode = CACHE_COPYBACK;
|
||||
flags.access = ACCESS_READ | ACCESS_WRITE | ACCESS_EXECUTE;
|
||||
mmu_map_page(SDRAM_START + SDRAM_SIZE - 0X00200000, SDRAM_START + SDRAM_SIZE - 0X00200000, MMU_PAGE_SIZE_1M, &flags);
|
||||
flags.cache_mode = CACHE_NOCACHE_PRECISE;
|
||||
flags.read = 1;
|
||||
flags.write = 1;
|
||||
flags.execute = 1;
|
||||
flags.supervisor_protect = 1; /* supervisor access only */
|
||||
flags.locked = 1;
|
||||
mmu_map_page(SDRAM_START + SDRAM_SIZE - 0x00200000, SDRAM_START + SDRAM_SIZE - 0x00200000, 0, MMU_PAGE_SIZE_1M, &flags);
|
||||
|
||||
/*
|
||||
* map EmuTOS (locked for now)
|
||||
*/
|
||||
flags.read = 1;
|
||||
flags.write = 1;
|
||||
flags.execute = 1;
|
||||
flags.locked = 1;
|
||||
//mmu_map_page(0xe00000, 0xe00000, MMU_PAGE_SIZE_1M, 0, &flags);
|
||||
|
||||
/*
|
||||
* Map (locked) the very last MB of physical SDRAM (this is where the driver buffers reside) to the same
|
||||
* virtual address. Used uncached for drivers.
|
||||
*/
|
||||
flags.cache_mode = CACHE_NOCACHE_PRECISE;
|
||||
flags.access = ACCESS_READ | ACCESS_WRITE;
|
||||
flags.protection = SV_PROTECT;
|
||||
mmu_map_page(SDRAM_START + SDRAM_SIZE - 0x00100000, SDRAM_START + SDRAM_SIZE - 0x00100000, MMU_PAGE_SIZE_1M, &flags);
|
||||
flags.read = 1;
|
||||
flags.write = 1;
|
||||
flags.execute = 0;
|
||||
flags.supervisor_protect = 1;
|
||||
flags.locked = 1;
|
||||
mmu_map_page(SDRAM_START + SDRAM_SIZE - 0x00100000, SDRAM_START + SDRAM_SIZE - 0x00100000, 0, MMU_PAGE_SIZE_1M, &flags);
|
||||
}
|
||||
|
||||
static struct mmu_map_flags flags =
|
||||
/*
|
||||
* enable the MMU. The Coldfire MMU can be used in two different modes
|
||||
* ... FIXME:
|
||||
*/
|
||||
void mmu_enable(void)
|
||||
{
|
||||
.cache_mode = CACHE_COPYBACK,
|
||||
.protection = SV_USER,
|
||||
.page_id = 0,
|
||||
.access = ACCESS_READ | ACCESS_WRITE | ACCESS_EXECUTE,
|
||||
.locked = false
|
||||
};
|
||||
MCF_MMU_MMUCR = MCF_MMU_MMUCR_EN; /* MMU on */
|
||||
NOP(); /* force pipeline sync */
|
||||
}
|
||||
|
||||
void mmutr_miss(uint32_t address, uint32_t pc, uint32_t format_status)
|
||||
#ifdef DBG_MMU
|
||||
void verify_mapping(uint32_t address)
|
||||
{
|
||||
dbg("MMU TLB MISS accessing 0x%08x\r\nFS = 0x%08x\r\nPC = 0x%08x\r\n", address, format_status, pc);
|
||||
// flush_and_invalidate_caches();
|
||||
/* retrieve mapped page from MMU and make sure everything is correct */
|
||||
int ds;
|
||||
|
||||
switch (address)
|
||||
ds = * (int *) address;
|
||||
dbg("found 0x%08x at address\r\n", ds);
|
||||
}
|
||||
#endif /* DBG_MMU */
|
||||
|
||||
uint32_t mmutr_miss(uint32_t mmu_sr, uint32_t fault_address, uint32_t pc,
|
||||
uint32_t format_status)
|
||||
{
|
||||
case keyctl:
|
||||
case keybd:
|
||||
/* do something to emulate the IKBD access */
|
||||
dbg("IKBD access\r\n");
|
||||
uint32_t fault = format_status & 0x0c030000;
|
||||
|
||||
switch (fault)
|
||||
{
|
||||
/* if we have a real TLB miss, map the offending page */
|
||||
|
||||
case 0x04010000: /* TLB miss on opword of instruction fetch */
|
||||
case 0x04020000: /* TLB miss on extension word of instruction fetch */
|
||||
dbg("MMU ITLB MISS accessing 0x%08x\r\n"
|
||||
"FS = 0x%08x\r\n"
|
||||
"MMUSR = 0x%08x\r\n"
|
||||
"PC = 0x%08x\r\n",
|
||||
fault_address, format_status, mmu_sr, pc);
|
||||
dbg("fault = 0x%08x\r\n", fault);
|
||||
mmu_map_8k_instruction_page(pc, 0);
|
||||
|
||||
/* due to prefetch, it makes sense to map the next adjacent page also for ITLBs */
|
||||
mmu_map_8k_instruction_page(pc + DEFAULT_PAGE_SIZE, 0);
|
||||
break;
|
||||
|
||||
case midictl:
|
||||
case midi:
|
||||
/* do something to emulate MIDI access */
|
||||
dbg("MIDI ACIA access\r\n");
|
||||
case 0x08020000: /* TLB miss on data write */
|
||||
case 0x0c020000: /* TLB miss on data read or read-modify-write */
|
||||
dbg("MMU DTLB MISS accessing 0x%08x\r\n"
|
||||
"FS = 0x%08x\r\n"
|
||||
"MMUSR = 0x%08x\r\n"
|
||||
"PC = 0x%08x\r\n",
|
||||
fault_address, format_status, mmu_sr, pc);
|
||||
dbg("fault = 0x%08x\r\n", fault);
|
||||
mmu_map_8k_data_page(fault_address, 0);
|
||||
break;
|
||||
|
||||
/* else issue an bus error */
|
||||
default:
|
||||
/* add missed page to TLB */
|
||||
mmu_map_page(address, address, MMU_PAGE_SIZE_1M, &flags);
|
||||
dbg("DTLB: MCF_MMU_MMUOR = %08x\r\n", MCF_MMU_MMUOR);
|
||||
dbg("ITLB: MCF_MMU_MMUOR = %08x\r\n\r\n", MCF_MMU_MMUOR);
|
||||
dbg("bus error\r\n");
|
||||
return 1; /* signal bus error to caller */
|
||||
}
|
||||
|
||||
#ifdef DBG_MMU
|
||||
xprintf("\r\n");
|
||||
#endif /* DBG_MMU */
|
||||
|
||||
return 0; /* signal TLB miss handled to caller */
|
||||
}
|
||||
|
||||
|
||||
|
||||
@@ -49,6 +49,8 @@ _rom_entry:
|
||||
/* set stack pointer to end of SRAM */
|
||||
lea __SUP_SP,a7
|
||||
move.l #0,(sp)
|
||||
subq.l #4,sp
|
||||
move.l #0,(sp)
|
||||
|
||||
/*
|
||||
* Initialize the processor caches.
|
||||
|
||||
@@ -63,9 +63,14 @@ void xputchar(int c)
|
||||
{
|
||||
__asm__ __volatile__
|
||||
(
|
||||
".extern printf_helper\n\t"
|
||||
" .extern __MBAR \n\t"
|
||||
" move.b %0,d0 \n\t"
|
||||
"bsr printf_helper\n\t"
|
||||
".wait_txready: \n\t"
|
||||
" move.w __MBAR + 0x8604,d2 \n\t" // PSCSCR0 status register
|
||||
" btst #10,d2 \n\t" // space left in TX fifo?
|
||||
" beq.s .wait_txready \n\t" // no, loop
|
||||
" lea __MBAR + 0x860C,a0 \n\t" // PSCSTB0 transmitter buffer register
|
||||
" move.b d0,(a0) \n\t" // send byte
|
||||
/* output */:
|
||||
/* input */: "r" (c)
|
||||
/* clobber */: "d0","d2","a0","memory"
|
||||
|
||||
@@ -1,38 +0,0 @@
|
||||
/*
|
||||
* printf_helper.S
|
||||
*
|
||||
* assembler trampoline to let printf (compiled -mpcrel) indirectly reference __MBAR
|
||||
*
|
||||
* This file is part of BaS_gcc.
|
||||
*
|
||||
* BaS_gcc is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation, either version 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* BaS_gcc is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with BaS_gcc. If not, see <http://www.gnu.org/licenses/>.
|
||||
*
|
||||
* Copyright 2010 - 2012 F. Aschwanden
|
||||
* Copyright 2011 - 2012 V. Riviere
|
||||
* Copyright 2012 M. Froeschle
|
||||
*/
|
||||
|
||||
|
||||
.global printf_helper
|
||||
printf_helper:
|
||||
.extern __MBAR
|
||||
.wait_txready:
|
||||
move.w __MBAR+0x8604,d2 // PSCSCR0 status register
|
||||
btst #10,d2 // space left in TX fifo?
|
||||
beq.s .wait_txready // no, loop
|
||||
lea __MBAR+0x860C,a0 // PSCSTB0 transmitter buffer register
|
||||
move.b d0,(a0) // send byte
|
||||
rts
|
||||
|
||||
// vim: set syntax=asm68k :
|
||||
Reference in New Issue
Block a user