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fixed error that caused plain EmuTOS to crash (video page was mapped supervisor protected)

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This commit is contained in:
Markus Fröschle
2013-12-21 16:16:23 +00:00
parent f7bfefda30
commit de0e14c696
1 changed files with 8 additions and 1 deletions
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9
BaS_gcc/sys/mmu.c
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@@ -265,7 +265,6 @@ void __attribute__((flatten)) mmu_init(void)
MCF_MMU_MMUOR_ACC | /* access TLB */
MCF_MMU_MMUOR_UAA; /* update allocation address field */
#if MACHINE_FIREBEE /* map FPGA video memory for FireBee only */
/*
* 0x00d0'0000 - 0x00df'ffff (last megabyte of ST RAM = Falcon video memory) locked ID = 6
* mapped to physical address 0x60d0'0000 (FPGA video memory)
@@ -273,10 +272,17 @@ void __attribute__((flatten)) mmu_init(void)
*/
MCF_MMU_MMUTR = 0x00d00000 | /* virtual address */
#if defined(MACHINE_FIREBEE)
MCF_MMU_MMUTR_ID(SCA_PAGE_ID) |
#endif /* MACHINE_FIREBEE */
MCF_MMU_MMUTR_SG | /* shared global */
MCF_MMU_MMUTR_V; /* valid */
#if defined(MACHINE_FIREBEE)
/* map FPGA video memory for FireBee only */
MCF_MMU_MMUDR = 0x60d00000 | /* physical address */
#elif defined(MACHINE_M5484LITE)
MCF_MMU_MMUDR = 0x00d00000 | /* physical address */
#endif /* MACHINE_FIREBEE */
MCF_MMU_MMUDR_SZ(0) | /* 1 MB page size */
MCF_MMU_MMUDR_CM(0x0) | /* cachable writethrough */
/* caveat: can't be supervisor protected since TOS puts the application stack there! */
@@ -291,6 +297,7 @@ void __attribute__((flatten)) mmu_init(void)
MCF_MMU_MMUOR_ACC | /* access TLB */
MCF_MMU_MMUOR_UAA; /* update allocation address field */
#if defined(MACHINE_FIREBEE)
video_tlb = 0x2000; /* set page as video page */
video_sbt = 0x0; /* clear time */
#endif /* MACHINE_FIREBEE */