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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
lea -11 * 4(sp),sp
clr.l -(sp) // no special functions
lea -15 * 4(sp),sp
movem.l d0-d1/a0-a1,sp // save gcc scratch registers
clr.l -(sp) // no special functions
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 #4,-(sp) // copy 4 bytes at a time
move.l #0x100000,-(sp) // copy 1 Megabyte
move.l #4,-(sp) // destination increment
move.l a1,-(sp) // destination adress
move.l #4,-(sp) // source increment
move.l a0,-(sp) // source adress
move.l #1,-(sp) // channel 1
move.l #4,-(sp) // copy 4 bytes at a time
move.l #0x100000,-(sp) // copy 1 Megabyte
move.l #4,-(sp) // destination increment
move.l a1,-(sp) // destination adress
move.l #4,-(sp) // source increment
move.l a0,-(sp) // source adress
move.l #1,-(sp) // channel 1
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:
clr.l -(sp)
@@ -652,8 +653,6 @@ wait_dma_finished:
tst.l d0
cmp.l #6,d0
bne wait_dma_finished
// intentionally no wait for the DMA to finish
#else
irq6_vcd0_loop:
move.l (a0)+,(a1)+ // page copy