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add region and heap setup for DSi/8meg debug DS

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This commit is contained in:
Dave Murphy 2009-10-01 00:40:09 +00:00
parent 887b93cdb7
commit 3bb9bae8b9
1 changed files with 54 additions and 23 deletions
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77
dkarm-eabi/crtls/ds_arm9_crt0.s
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@ -38,7 +38,7 @@
#define DCACHE_ENABLE (1<<2)
#define PROTECT_ENABLE (1<<0)
.equ _libnds_argv,0x027FFF70
.equ _libnds_argv,0x02FFFE70
@---------------------------------------------------------------------------------
.section ".init"
@ -91,9 +91,9 @@ _start:
mcr p15, 0, r0, c6, c0, 0
@-------------------------------------------------------------------------
@ Region 1 - Main Memory
@ Region 1 - System ROM
@-------------------------------------------------------------------------
ldr r0,=( PAGE_4M | 0x02000000 | 1)
ldr r0,=( PAGE_32K | 0xFFFF0000 | 1)
mcr p15, 0, r0, c6, c1, 0
@-------------------------------------------------------------------------
@ -102,21 +102,16 @@ _start:
ldr r0,=( PAGE_4K | 0x00000000 | 1)
mcr p15, 0, r0, c6, c2, 0
@-------------------------------------------------------------------------
@ Region 3 - DS Accessory (GBA Cart)
@-------------------------------------------------------------------------
ldr r0,=( PAGE_128M | 0x08000000 | 1)
mcr p15, 0, r0, c6, c3, 0
@-------------------------------------------------------------------------
@ Region 4 - DTCM
@ Region 3 - DTCM
@-------------------------------------------------------------------------
ldr r0,=__dtcm_start
orr r0,r0,#(PAGE_16K | 1)
mcr p15, 0, r0, c6, c4, 0
mcr p15, 0, r0, c6, c3, 0
@-------------------------------------------------------------------------
@ Region 5 - ITCM
@ Region 4 - ITCM
@-------------------------------------------------------------------------
ldr r0,=__itcm_start
@ -125,19 +120,53 @@ _start:
mov r0,r0,lsl #15
orr r0,r0,#(PAGE_32K | 1)
mcr p15, 0, r0, c6, c5, 0
mcr p15, 0, r0, c6, c4, 0
ldr r0,=0x4004008
ldr r0,[r0]
ands r0,r0,#0x8000
bne dsi_mode
swi 0xf0000
ldr r1,=( PAGE_128M | 0x08000000 | 1)
cmp r0,#0
bne debug_mode
ldr r2,=( PAGE_4M | 0x02000000 | 1)
ldr r3,=( PAGE_4M | 0x02C00000 | 1)
mov r8,#0x02400000
b setregions
debug_mode:
ldr r2,=( PAGE_8M | 0x02000000 | 1)
ldr r3,=( PAGE_8M | 0x02800000 | 1)
mov r8,#0x02800000
b setregions
dsi_mode:
ldr r1,=( PAGE_8M | 0x03000000 | 1)
ldr r2,=( PAGE_16M | 0x02000000 | 1)
ldr r3,=( PAGE_16M | 0x0C000000 | 1)
mov r8,#0x03000000
setregions:
@-------------------------------------------------------------------------
@ Region 6 - System ROM
@ Region 5 - DS Accessory (GBA Cart) / DSi switchable iwram
@-------------------------------------------------------------------------
ldr r0,=( PAGE_32K | 0xFFFF0000 | 1)
mcr p15, 0, r0, c6, c6, 0
mcr p15, 0, r1, c6, c5, 0
@-------------------------------------------------------------------------
@ Region 6 - Main Memory
@-------------------------------------------------------------------------
mcr p15, 0, r2, c6, c6, 0
@-------------------------------------------------------------------------
@ Region 7 - non cacheable main ram
@-------------------------------------------------------------------------
ldr r0,=( PAGE_4M | 0x02400000 | 1)
mcr p15, 0, r0, c6, c7, 0
mcr p15, 0, r3, c6, c7, 0
@-------------------------------------------------------------------------
@ Write buffer enable
@ -211,9 +240,6 @@ _start:
sub r1, r1, r0
bl ClearMem
ldr r1, =fake_heap_end @ set heap end
ldr r0, =__eheap_end
str r0, [r1]
ldr r0, =_libnds_argv
@ -222,6 +248,10 @@ _start:
ldr r1,=fake_heap_start
str r2,[r1]
ldr r1, =fake_heap_end @ set heap end
sub r8,r8,#0x8000
str r8, [r1]
push {r0}
ldr r3, =initSystem
blx r3 @ system initialisation
@ -240,7 +270,7 @@ _start:
@ If the user ever returns, go back to passme loop
ldr r0, =ILoop
ldr r0, [r0]
ldr r1, =0x027FFE78
ldr r1, =0x02FFFE78
str r0, [r1]
bx r1
ILoop:
@ -256,9 +286,10 @@ checkARGV:
str r1, [r0,#12] @ clear argc
str r1, [r0,#16] @ clear argv
ldr r1, [r0] @ argv magic number
ldr r3, [r0] @ argv magic number
ldr r2, =0x5f617267 @ '_arg'
cmp r1, r2
cmp r3, r2
strne r1,[r0,#20]
bxne lr @ bail out if no magic
ldr r1, [r0, #4] @ command line address