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fixed mp3 buffer overlapping of GP2X sound buffer

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@129 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-05-12 15:06:44 +00:00
parent d5d119243c
commit e362c57310
4 changed files with 32 additions and 20 deletions
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31
platform/gp2x/code940/940init.s
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@ -87,19 +87,25 @@ code940:
mcr p15, 0, r0, c6, c3, 0
mcr p15, 0, r0, c6, c3, 1
@ set up region 4: 16M 0x01000000-0x02000000 (mp3 area)
mov r0, #(0x17<<1)|1
orr r0, r0, #0x01000000
@ region 4: 4K 0x00000000-0x00001000 (boot code protection region)
mov r0, #(0x0b<<1)|1
mcr p15, 0, r0, c6, c4, 0
mcr p15, 0, r0, c6, c4, 1
@ region 5: 4K 0x00000000-0x00001000 (boot code protection region)
mov r0, #(0x0b<<1)|1
@ region 5: 4M 0x00400000-0x00800000 (mp3 area part1)
mov r0, #(0x15<<1)|1
orr r0, r0, #0x00400000
mcr p15, 0, r0, c6, c5, 0
mcr p15, 0, r0, c6, c5, 1
@ set regions 1, 4 and 5 to be cacheable (so the first 2M and mp3 area will be cacheable)
mov r0, #(1<<1)|(1<<4)|(1<<5)
@ region 6: 8M 0x00800000-0x01000000 (mp3 area part2)
mov r0, #(0x16<<1)|1
orr r0, r0, #0x00800000
mcr p15, 0, r0, c6, c6, 0
mcr p15, 0, r0, c6, c6, 1
@ set regions 1, 4, 5 and 6 to be cacheable (so the first 2M and mp3 area will be cacheable)
mov r0, #(1<<1)|(1<<4)|(1<<5)|(1<<6)
mcr p15, 0, r0, c2, c0, 0
mcr p15, 0, r0, c2, c0, 1
@ -108,12 +114,13 @@ code940:
mcr p15, 0, r0, c3, c0, 0
@ set access protection
@ data: [no, full, full, full, full, no access] for regions [5 4 3 2 1 0]
mov r0, #(0<<10)|(3<<8)|(3<<6)|(3<<4)|(3<<2)|(0)
@ data: [full, full, no, full, full, full, no access] for regions [6 5 4 3 2 1 0]
mov r0, # (3<<12)|(3<<10)|(0<<8)
orr r0, r0, #(3<<6)|(3<< 4)|(3<< 2)|(0<<0)
mcr p15, 0, r0, c5, c0, 0
@ instructions: [full, no access, no, no, full, no]
mov r0, #(0<< 6)|(0<<4)|(3<<2)|(0)
orr r0, r0, #(3<<10)|(0<<8)
@ instructions: [no, no, full, no, no, full, no]
mov r0, # (0<<12)|(0<<10)|(3<<8)
orr r0, r0, #(0<<6)|(0<< 4)|(3<< 2)|(0<<0)
mcr p15, 0, r0, c5, c0, 1
mrc p15, 0, r0, c1, c0, 0 @ fetch current control reg