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fixed save and restore of gcc scratch registers on DMA video page copy

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This commit is contained in:
Markus Fröschle
2013-10-31 06:25:36 +00:00
parent 72ad187f89
commit 7ac1e76ca3
2 changed files with 18 additions and 19 deletions
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27
sources/exceptions.S
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@@ -629,21 +629,22 @@ irq6_sca_pn1c:
// experiment: do video page copy using Coldfire DMA // experiment: do video page copy using Coldfire DMA
lea -11 * 4(sp),sp lea -15 * 4(sp),sp
movem.l d0-d1/a0-a1,sp // save gcc scratch registers
clr.l -(sp) // no special functions clr.l -(sp) // no special functions
move.l #MCD_SINGLE_DMA|MCD_TT_FLAGS_CW|MCD_TT_FLAGS_RL|MCD_TT_FLAGS_SP,-(sp) move.l #MCD_SINGLE_DMA|MCD_TT_FLAGS_CW|MCD_TT_FLAGS_RL|MCD_TT_FLAGS_SP,-(sp)
mov3q #7,-(sp) // highest DMA priority mov3q #7,-(sp) // highest DMA priority
move.l #DMA_ALWAYS,-(sp) // do memory to memory DMA move.l #DMA_ALWAYS,-(sp) // do memory to memory DMA
move.l #4,-(sp) // copy 4 bytes at a time move.l #4,-(sp) // copy 4 bytes at a time
move.l #0x100000,-(sp) // copy 1 Megabyte move.l #0x100000,-(sp) // copy 1 Megabyte
move.l #4,-(sp) // destination increment move.l #4,-(sp) // destination increment
move.l a1,-(sp) // destination adress move.l a1,-(sp) // destination adress
move.l #4,-(sp) // source increment move.l #4,-(sp) // source increment
move.l a0,-(sp) // source adress move.l a0,-(sp) // source adress
move.l #1,-(sp) // channel 1 move.l #1,-(sp) // channel 1
jsr _MCD_startDma jsr _MCD_startDma
lea 11 * 4(sp),sp // adjust stack movem.l (sp),d0-d1/a0-a1 // restore gcc scratch registers
lea 15 * 4(sp),sp // adjust stack
wait_dma_finished: wait_dma_finished:
clr.l -(sp) clr.l -(sp)
@@ -652,8 +653,6 @@ wait_dma_finished:
tst.l d0 tst.l d0
cmp.l #6,d0 cmp.l #6,d0
bne wait_dma_finished bne wait_dma_finished
// intentionally no wait for the DMA to finish
#else #else
irq6_vcd0_loop: irq6_vcd0_loop:
move.l (a0)+,(a1)+ // page copy move.l (a0)+,(a1)+ // page copy

10
sources/mmu.S
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@@ -190,19 +190,19 @@ _mmu_init:
rts rts
/* /*
* Everything else gets a 1:1 mapping on miss * Everything else gets 1:1 mapped on miss
*/ */
_mmutr_miss: _mmutr_miss:
lea -8 * 4(sp),sp lea -4 * 4(sp),sp
movem.l d0-d3/a0-a3,(sp) movem.l d0-d1/a0-a1,(sp) // save gcc scratch registers
move.l d0,-(sp) move.l d0,-(sp)
pea MISS_text pea MISS_text
jsr _xprintf jsr _xprintf
addq.l #8,sp addq.l #8,sp
movem.l (sp),d0-d3/a0-a3 movem.l (sp),d0-d1/a0-a1 // restore registers
lea 8 * 4(sp),sp lea 4 * 4(sp),sp
bsr cpusha // clear caches bsr cpusha // clear caches