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-rw-r--r--asm/crt0.s3
-rw-r--r--asm/emerald.s133
-rw-r--r--asm/libagbsyscall.s1
-rw-r--r--asm/libgcnmultiboot.s525
-rw-r--r--asm/rom_header.s2
5 files changed, 383 insertions, 281 deletions
diff --git a/asm/crt0.s b/asm/crt0.s
index 6173a2f1a..b93f6368d 100644
--- a/asm/crt0.s
+++ b/asm/crt0.s
@@ -1,3 +1,6 @@
+RomBase: ; 8000000
+ b Init
+
.include "asm/rom_header.s"
_080000C0:
diff --git a/asm/emerald.s b/asm/emerald.s
index 7ce518805..aaab7fb54 100644
--- a/asm/emerald.s
+++ b/asm/emerald.s
@@ -702397,16 +702397,16 @@ load_copyright_graphics: ; 816CC70
.pool
thumb_func_end load_copyright_graphics
- thumb_func_start sub_816CCB8
-sub_816CCB8: ; 816CCB8
+ thumb_func_start SerialCb_CopyrightScreen
+SerialCb_CopyrightScreen: ; 816CCB8
push {lr}
ldr r0, =0x030062b0
- bl sub_82DEEE2
+ bl GameCubeMultiBoot_HandleSerialInterrupt
pop {r0}
bx r0
.align 2, 0
.pool
- thumb_func_end sub_816CCB8
+ thumb_func_end SerialCb_CopyrightScreen
thumb_func_start do_copyright_screen
do_copyright_screen: ; 816CCC8
@@ -702509,10 +702509,10 @@ do_copyright_screen: ; 816CCC8
lsls r2, 1
adds r0, r2, 0
strh r0, [r1]
- ldr r0, =sub_816CCB8
+ ldr r0, =SerialCb_CopyrightScreen
bl set_serial_callback
ldr r0, =0x030062b0
- bl sub_82DEE98
+ bl GameCubeMultiBoot_Init
@0816CDBC:
bl fade_and_return_progress_probably
ldr r0, =0x030022c0
@@ -702523,14 +702523,14 @@ do_copyright_screen: ; 816CCC8
adds r1, 0x1
strb r1, [r0]
ldr r0, =0x030062b0
- bl sub_82DED84
+ bl GameCubeMultiBoot_Main
b @0816CEA0
.align 2, 0
.pool
@0816CE00:
ldr r4, =0x030062b0
adds r0, r4, 0
- bl sub_82DED84
+ bl GameCubeMultiBoot_Main
ldrb r0, [r4, 0x2]
cmp r0, 0x1
beq @0816CEA0
@@ -702578,12 +702578,12 @@ do_copyright_screen: ; 816CCC8
str r4, [r6]
@0816CE6C:
adds r0, r5, 0
- bl sub_82DEE84
+ bl GameCubeMultiBoot_ExecuteProgram
b @0816CE96
.align 2, 0
.pool
@0816CE8C:
- bl sub_82DF012
+ bl GameCubeMultiBoot_Quit
ldr r0, =sub_800BA38
bl set_serial_callback
@0816CE96:
@@ -853744,8 +853744,9 @@ GetGlyphWidthFont6: ; 81BA6CC
bx lr
thumb_func_end GetGlyphWidthFont6
- thumb_func_start sub_81BA6D0
-sub_81BA6D0: ; 81BA6D0
+ thumb_func_start MultiBootInit
+; void MultiBootInit(MultiBootParam *mp)
+MultiBootInit: ; 81BA6D0
adds r2, r0, 0
movs r1, 0
strb r1, [r2, 0x1E]
@@ -853770,17 +853771,18 @@ sub_81BA6D0: ; 81BA6D0
bx lr
.align 2, 0
.pool
- thumb_func_end sub_81BA6D0
+ thumb_func_end MultiBootInit
- thumb_func_start sub_81BA70C
-sub_81BA70C: ; 81BA70C
+ thumb_func_start MultiBootMain
+; int MultiBootMain(MultiBootParam *mp)
+MultiBootMain: ; 81BA70C
push {r4-r7,lr}
mov r7, r10
mov r6, r9
mov r5, r8
push {r5-r7}
adds r7, r0, 0
- bl sub_81BAC30
+ bl MultiBootCheckComplete
cmp r0, 0
beq @081BA722
b @081BAAEA
@@ -853810,7 +853812,7 @@ sub_81BA70C: ; 81BA70C
cmp r5, 0x8
beq @081BA760
adds r0, r7, 0
- bl sub_81BA6D0
+ bl MultiBootInit
movs r0, 0x8
eors r0, r5
b @081BAAEC
@@ -853821,7 +853823,7 @@ sub_81BA70C: ; 81BA70C
cmp r0, 0xDF
bls @081BA7B2
adds r0, r7, 0
- bl sub_81BAC44
+ bl MultiBootHandShake
adds r5, r0, 0
cmp r5, 0
beq @081BA774
@@ -853836,13 +853838,13 @@ sub_81BA70C: ; 81BA70C
cmp r0, 0xE1
bls @081BA790
adds r0, r7, 0
- bl sub_81BAC30
+ bl MultiBootCheckComplete
cmp r0, 0
bne @081BA790
b @081BAADA
@081BA790:
adds r0, r7, 0
- bl sub_81BAC30
+ bl MultiBootCheckComplete
cmp r0, 0
beq @081BA79C
b @081BAAEA
@@ -853851,7 +853853,7 @@ sub_81BA70C: ; 81BA70C
cmp r0, 0
bne @081BA7AC
adds r0, r7, 0
- bl sub_81BA6D0
+ bl MultiBootInit
movs r0, 0x71
b @081BAAEC
@081BA7AC:
@@ -853963,7 +853965,7 @@ sub_81BA70C: ; 81BA70C
cmp r0, r2
beq @081BA88A
adds r0, r7, 0
- bl sub_81BAB48
+ bl MultiBootStartProbe
b @081BA892
.align 2, 0
.pool
@@ -854113,7 +854115,7 @@ sub_81BA70C: ; 81BA70C
adds r0, r2, 0
orrs r1, r0
adds r0, r7, 0
- bl sub_81BAAFC
+ bl MultiBootSend
b @081BAAEC
.align 2, 0
.pool
@@ -854139,7 +854141,7 @@ sub_81BA70C: ; 81BA70C
orrs r3, r0
adds r0, r7, 0
adds r1, r3, 0
- bl sub_81BAAFC
+ bl MultiBootSend
b @081BAAEC
@081BA9D6:
movs r5, 0x3
@@ -854177,7 +854179,7 @@ sub_81BA70C: ; 81BA70C
.pool
@081BAA18:
adds r0, r7, 0
- bl sub_81BA6D0
+ bl MultiBootInit
movs r0, 0x1E
mov r1, r10
strb r0, [r1]
@@ -854244,7 +854246,7 @@ sub_81BA70C: ; 81BA70C
cmp r0, 0
bne @081BAAA2
adds r0, r7, 0
- bl sub_81BA6D0
+ bl MultiBootInit
movs r0, 0x50
b @081BAAEC
@081BAAA2:
@@ -854267,7 +854269,7 @@ sub_81BA70C: ; 81BA70C
ldrb r1, [r0]
orrs r1, r2
adds r0, r7, 0
- bl sub_81BAAFC
+ bl MultiBootSend
adds r5, r0, 0
cmp r5, 0
bne @081BAAEC
@@ -854277,11 +854279,11 @@ sub_81BA70C: ; 81BA70C
cmp r0, 0x1
bne @081BAAEA
@081BAADA:
- bl sub_81BAD48
+ bl MultiBootWaitSendDone
b @081BA736
@081BAAE0:
adds r0, r7, 0
- bl sub_81BA6D0
+ bl MultiBootInit
movs r0, 0x60
b @081BAAEC
@081BAAEA:
@@ -854294,10 +854296,11 @@ sub_81BA70C: ; 81BA70C
pop {r4-r7}
pop {r1}
bx r1
- thumb_func_end sub_81BA70C
+ thumb_func_end MultiBootMain
- thumb_func_start sub_81BAAFC
-sub_81BAAFC: ; 81BAAFC
+ thumb_func_start MultiBootSend
+; int MultiBootSend(MultiBootParam *mp, u16 data)
+MultiBootSend: ; 81BAAFC
push {r4,lr}
adds r2, r0, 0
lsls r1, 16
@@ -854323,7 +854326,7 @@ sub_81BAAFC: ; 81BAAFC
.pool
@081BAB34:
adds r0, r2, 0
- bl sub_81BA6D0
+ bl MultiBootInit
movs r0, 0x8
eors r4, r0
adds r0, r4, 0
@@ -854331,17 +854334,18 @@ sub_81BAAFC: ; 81BAAFC
pop {r4}
pop {r1}
bx r1
- thumb_func_end sub_81BAAFC
+ thumb_func_end MultiBootSend
- thumb_func_start sub_81BAB48
-sub_81BAB48: ; 81BAB48
+ thumb_func_start MultiBootStartProbe
+; void MultiBootStartProbe(MultiBootParam *mp)
+MultiBootStartProbe: ; 81BAB48
push {lr}
adds r1, r0, 0
ldrb r0, [r1, 0x18]
cmp r0, 0
beq @081BAB5A
adds r0, r1, 0
- bl sub_81BA6D0
+ bl MultiBootInit
b @081BAB66
@081BAB5A:
adds r2, r1, 0
@@ -854353,10 +854357,11 @@ sub_81BAB48: ; 81BAB48
@081BAB66:
pop {r0}
bx r0
- thumb_func_end sub_81BAB48
+ thumb_func_end MultiBootStartProbe
- thumb_func_start sub_81BAB6C
-sub_81BAB6C: ; 81BAB6C
+ thumb_func_start MultiBootStartMaster
+; void MultiBootStartMaster(MultiBootParam *mp, u8 *srcp, int length, u8 palette_color, s8 palette_speed)
+MultiBootStartMaster: ; 81BAB6C
push {r4-r7,lr}
adds r4, r0, 0
adds r6, r1, 0
@@ -854389,7 +854394,7 @@ sub_81BAB6C: ; 81BAB6C
bls @081BABB4
@081BABA8:
adds r0, r4, 0
- bl sub_81BA6D0
+ bl MultiBootInit
b @081BAC28
.align 2, 0
.pool
@@ -854453,10 +854458,11 @@ sub_81BAB6C: ; 81BAB6C
pop {r4-r7}
pop {r0}
bx r0
- thumb_func_end sub_81BAB6C
+ thumb_func_end MultiBootStartMaster
- thumb_func_start sub_81BAC30
-sub_81BAC30: ; 81BAC30
+ thumb_func_start MultiBootCheckComplete
+; s32 MultiBootCheckComplete(MultiBootParam *mp)
+MultiBootCheckComplete: ; 81BAC30
push {lr}
ldrb r0, [r0, 0x18]
cmp r0, 0xE9
@@ -854468,10 +854474,11 @@ sub_81BAC30: ; 81BAC30
@081BAC3E:
pop {r1}
bx r1
- thumb_func_end sub_81BAC30
+ thumb_func_end MultiBootCheckComplete
- thumb_func_start sub_81BAC44
-sub_81BAC44: ; 81BAC44
+ thumb_func_start MultiBootHandShake
+; int MultiBootHandShake(MultiBootParam *mp)
+MultiBootHandShake: ; 81BAC44
push {r4-r6,lr}
adds r3, r0, 0
ldrb r0, [r3, 0x18]
@@ -854543,7 +854550,7 @@ sub_81BAC44: ; 81BAC44
ldrh r1, [r3]
@081BACC2:
adds r0, r3, 0
- bl sub_81BAAFC
+ bl MultiBootSend
b @081BAD28
.align 2, 0
.pool
@@ -854588,7 +854595,7 @@ sub_81BAC44: ; 81BAC44
.pool
@081BAD1C:
adds r0, r3, 0
- bl sub_81BA6D0
+ bl MultiBootInit
movs r0, 0x71
b @081BAD28
@081BAD26:
@@ -854597,10 +854604,11 @@ sub_81BAC44: ; 81BAC44
pop {r4-r6}
pop {r1}
bx r1
- thumb_func_end sub_81BAC44
+ thumb_func_end MultiBootHandShake
- thumb_func_start sub_81BAD30
-sub_81BAD30: ; 81BAD30
+ thumb_func_start MultiBootWaitCycles
+; void MultiBootWaitCycles(u32 cycles)
+MultiBootWaitCycles: ; 81BAD30
mov r2, pc
lsrs r2, 24
movs r1, 0xC
@@ -854614,10 +854622,11 @@ sub_81BAD30: ; 81BAD30
subs r0, r1
bgt @081BAD42
bx lr
- thumb_func_end sub_81BAD30
+ thumb_func_end MultiBootWaitCycles
- thumb_func_start sub_81BAD48
-sub_81BAD48: ; 81BAD48
+ thumb_func_start MultiBootWaitSendDone
+; voidMultiBootWaitSendDone(void)
+MultiBootWaitSendDone: ; 81BAD48
push {r4,r5,lr}
movs r2, 0
ldr r3, =0x04000128
@@ -854640,13 +854649,13 @@ sub_81BAD48: ; 81BAD48
@081BAD6C:
movs r0, 0x96
lsls r0, 2
- bl sub_81BAD30
+ bl MultiBootWaitCycles
pop {r4,r5}
pop {r0}
bx r0
.align 2, 0
.pool
- thumb_func_end sub_81BAD48
+ thumb_func_end MultiBootWaitSendDone
thumb_func_start sub_81BAD84
sub_81BAD84: ; 81BAD84
@@ -862975,7 +862984,7 @@ sub_81BF3DC: ; 81BF3DC
strb r5, [r0]
ldr r0, [r4]
adds r0, 0x4
- bl sub_81BA6D0
+ bl MultiBootInit
ldr r1, [r4]
strh r5, [r1, 0x2]
movs r0, 0x4
@@ -862986,7 +862995,7 @@ sub_81BF3DC: ; 81BF3DC
adds r4, r5, 0
ldr r0, [r4]
adds r0, 0x4
- bl sub_81BA70C
+ bl MultiBootMain
ldr r4, [r4]
ldrb r0, [r4, 0x1C]
cmp r0, 0
@@ -863017,7 +863026,7 @@ sub_81BF3DC: ; 81BF3DC
movs r3, 0x1
str r3, [sp]
movs r3, 0x4
- bl sub_81BAB6C
+ bl MultiBootStartMaster
ldr r1, [r5]
movs r0, 0x5
b @081BF590
@@ -863032,10 +863041,10 @@ sub_81BF3DC: ; 81BF3DC
ldr r5, =0x030012b8
ldr r0, [r5]
adds r0, 0x4
- bl sub_81BA70C
+ bl MultiBootMain
ldr r0, [r5]
adds r0, 0x4
- bl sub_81BAC30
+ bl MultiBootCheckComplete
cmp r0, 0
beq @081BF540
ldr r1, [r5]
diff --git a/asm/libagbsyscall.s b/asm/libagbsyscall.s
index 923a7a98e..a0d0726f2 100644
--- a/asm/libagbsyscall.s
+++ b/asm/libagbsyscall.s
@@ -46,6 +46,7 @@ LZ77UnCompWram: ; 82E7090
thumb_func_end LZ77UnCompWram
thumb_func_start MultiBoot
+; s32 MultiBoot(struct MultiBootParam *mp)
MultiBoot: ; 82E7094
movs r1, 0x1
swi 0x25
diff --git a/asm/libgcnmultiboot.s b/asm/libgcnmultiboot.s
index 6270dc9e7..8ca22b587 100644
--- a/asm/libgcnmultiboot.s
+++ b/asm/libgcnmultiboot.s
@@ -1,22 +1,34 @@
- thumb_func_start sub_82DED70
-sub_82DED70: ; 82DED70
+; This library can be used to download and execute a multi-boot image from
+; a GameCube using the JOY Bus protocol over the link cable.
+
+ .set GCMB_STRUCT_BASE_DEST_PTR, 0x20
+ .set GCMB_STRUCT_CUR_DEST_PTR, 0x24
+ .set GCMB_STRUCT_SERIAL_INTR_HANDLER, 0x28
+
+ thumb_func_start GameCubeMultiBoot_Hash
+GameCubeMultiBoot_Hash: ; 82DED70
push {r4,lr}
- ldr r4, _082DEE78
+ ldr r4, pool_HashVal
eors r3, r1
movs r2, 0x20
-_082DED78:
+
+@loop:
lsrs r3, 1
- bcc _082DED7E
+ bcc @skipExclusiveOr
+
eors r3, r4
-_082DED7E:
+
+@skipExclusiveOr:
subs r2, 0x1
- bne _082DED78
+ bne @loop
+
pop {r4,pc}
- thumb_func_end sub_82DED70
+ thumb_func_end GameCubeMultiBoot_Hash
- thumb_func_start sub_82DED84
-sub_82DED84: ; 82DED84
- ldr r1, [r0, 0x28]
+ thumb_func_start GameCubeMultiBoot_Main
+; void GameCubeMultiBoot_Main(struct GameCubeMultiBoot *mb);
+GameCubeMultiBoot_Main: ; 82DED84
+ ldr r1, [r0, GCMB_STRUCT_SERIAL_INTR_HANDLER]
cmp r1, 0
beq _082DEDAA
ldrb r1, [r0, 0x1]
@@ -25,32 +37,32 @@ sub_82DED84: ; 82DED84
ldrb r1, [r0, 0x2]
cmp r1, 0x2
beq _082DEDF4
- ldr r3, _082DF038
- ldrh r2, [r3, 0x8]
+ ldr r3, pool_InterruptRegs
+ ldrh r2, [r3, OFFSET_REG_IME - 0x200]
movs r1, 0
- strh r1, [r3, 0x8]
+ strh r1, [r3, OFFSET_REG_IME - 0x200]
ldrb r1, [r0]
cmp r1, 0xA
bgt _082DEDA8
adds r1, 0x1
strb r1, [r0]
_082DEDA8:
- strh r2, [r3, 0x8]
+ strh r2, [r3, OFFSET_REG_IME - 0x200]
_082DEDAA:
- bcs sub_82DEE98
+ bcs GameCubeMultiBoot_Init
ldrb r1, [r0, 0x2]
cmp r1, 0
bne _082DEDF6
- ldr r1, [r0, 0x24]
- ldr r2, [r0, 0x20]
+ ldr r1, [r0, GCMB_STRUCT_CUR_DEST_PTR]
+ ldr r2, [r0, GCMB_STRUCT_BASE_DEST_PTR]
subs r1, r2
beq _082DEE76
cmp r1, 0xA0
bcc _082DEE76
push {r4-r6}
movs r1, 0x98
- adds r2, 0x4
- ldr r4, _082DEE80
+ adds r2, RomHeaderNintendoLogo - RomBase
+ ldr r4, pool_NintendoLogo
_082DEDC6:
ldm r2!, {r5}
ldm r4!, {r6}
@@ -62,31 +74,31 @@ _082DEDC6:
ldm r4!, {r6}
eors r5, r6
lsrs r5, 8
- str r2, [r0, 0x20]
+ str r2, [r0, GCMB_STRUCT_BASE_DEST_PTR]
_082DEDDC:
pop {r4-r6}
- bne sub_82DEE98
+ bne GameCubeMultiBoot_Init
movs r1, 0x1
strb r1, [r0, 0x2]
ldr r1, [r0, 0x4]
ldr r2, [r0, 0x8]
eors r1, r2
str r1, [r0, 0x18]
- ldr r2, _082DEE7C
+ ldr r2, pool_Kawa
muls r1, r2
adds r1, 0x1
str r1, [r0, 0x14]
_082DEDF4:
bx lr
_082DEDF6:
- ldr r1, [r0, 0x24]
+ ldr r1, [r0, GCMB_STRUCT_CUR_DEST_PTR]
mov r12, r1
ldr r3, [r0, 0x18]
push {r4-r7}
- ldr r4, [r0, 0x20]
- ldr r5, _082DEE7C
+ ldr r4, [r0, GCMB_STRUCT_BASE_DEST_PTR]
+ ldr r5, pool_Kawa
ldr r6, [r0, 0x14]
- ldr r7, _082DEE78
+ ldr r7, pool_HashVal
_082DEE06:
cmp r4, r12
bcs _082DEE26
@@ -107,15 +119,15 @@ _082DEE1C:
adds r6, 0x1
b _082DEE06
_082DEE26:
- str r4, [r0, 0x20]
+ str r4, [r0, GCMB_STRUCT_BASE_DEST_PTR]
str r6, [r0, 0x14]
pop {r4-r7}
str r3, [r0, 0x18]
ldrh r1, [r0, 0x12]
cmp r1, 0
bne _082DEE76
- ldr r1, [r0, 0x24]
- ldr r2, [r0, 0x20]
+ ldr r1, [r0, GCMB_STRUCT_CUR_DEST_PTR]
+ ldr r2, [r0, GCMB_STRUCT_BASE_DEST_PTR]
cmp r1, r2
bne _082DEE76
ldr r1, [r0, 0xC]
@@ -127,11 +139,11 @@ _082DEE26:
mov r12, lr
movs r1, 0xBB
ldr r3, [r0, 0xC]
- bl sub_82DED70
+ bl GameCubeMultiBoot_Hash
ldrh r1, [r0, 0x10]
mov lr, r12
subs r1, r3
- bne sub_82DEE98
+ bne GameCubeMultiBoot_Init
movs r1, 0x2
strb r1, [r0, 0x2]
bx lr
@@ -141,153 +153,205 @@ _082DEE60:
lsls r1, 24
subs r1, 0x1
str r1, [r0, 0xC]
- bl sub_82DED70
+ bl GameCubeMultiBoot_Hash
lsls r3, 8
adds r3, 0xFF
str r3, [r0, 0x1C]
bx r12
_082DEE76:
bx lr
+ thumb_func_end GameCubeMultiBoot_Main
+
.align 2, 0
-_082DEE78: .4byte 0x0000a1c1
-_082DEE7C: .4byte 0x6177614b
-_082DEE80: .4byte RomHeaderNintendoLogo
- thumb_func_end sub_82DED84
- thumb_func_start sub_82DEE84
-sub_82DEE84: ; 82DEE84
+pool_HashVal: .4byte 0xa1c1
+
+pool_Kawa: .ascii "Kawa" ; name of BIOS developer
+
+pool_NintendoLogo: .4byte RomHeaderNintendoLogo
+
+ thumb_func_start GameCubeMultiBoot_ExecuteProgram
+; void GameCubeMultiBoot_ExecuteProgram(struct GameCubeMultiBoot *mb);
+GameCubeMultiBoot_ExecuteProgram: ; 82DEE84
ldrb r1, [r0, 0x2]
cmp r1, 0x2
- bne _082DEE96
- ldr r3, _082DF038
+ bne @unableToExecute
+ ldr r3, pool_InterruptRegs
movs r1, 0
- strh r1, [r3, 0x8]
- ldr r1, _082DF048
+ strh r1, [r3, OFFSET_REG_IME - 0x200]
+ ldr r1, pool_MultiBootLoadAddr
adds r1, 0xC0
bx r1
-_082DEE96:
+@unableToExecute:
bx lr
- thumb_func_end sub_82DEE84
+ thumb_func_end GameCubeMultiBoot_ExecuteProgram
+
+ thumb_func_start GameCubeMultiBoot_Init
+; void GameCubeMultiBoot_Init(struct GameCubeMultiBoot *mb);
+GameCubeMultiBoot_Init: ; 82DEE98
+ ldr r3, pool_InterruptRegs
+
+; Save IME register.
+ ldrh r2, [r3, OFFSET_REG_IME - 0x200]
- thumb_func_start sub_82DEE98
-sub_82DEE98: ; 82DEE98
- ldr r3, _082DF038
- ldrh r2, [r3, 0x8]
+; Disable interrupts.
movs r1, 0
- strh r1, [r3, 0x8]
- adr r3, _082DEEF8
- str r3, [r0, 0x28]
+ strh r1, [r3, OFFSET_REG_IME - 0x200]
+
+; Set the handler to the "Stop" routine.
+; Unless the first command that is received is a device reset command, the
+; "Stop" routine will be executed and no further commands will be processed.
+ adr r3, GcMbIntrHandler_Stop
+ str r3, [r0, GCMB_STRUCT_SERIAL_INTR_HANDLER]
+
ldrb r3, [r0, 0x3]
push {r3}
ldrb r3, [r0, 0x1]
push {r0,r3}
+
adds r3, r0, 0
- adds r3, 0x20
-_082DEEB0:
+ adds r3, GCMB_STRUCT_BASE_DEST_PTR
+
+; clear all but the last 3 fields of the struct
+@clearStructLoop:
stm r0!, {r1}
cmp r0, r3
- bcc _082DEEB0
+ blo @clearStructLoop
+
pop {r0,r3}
lsrs r3, 1
strb r3, [r0, 0x3]
pop {r3}
strb r3, [r0, 0x1]
- ldr r3, _082DF03C
+
+ ldr r3, pool_SerialRegs
+
+; Turn off JOY Bus mode.
lsls r0, r3, 10
- strh r0, [r3, 0x14]
+ strh r0, [r3, OFFSET_REG_RCNT - 0x120]
+
+; Turn on JOY Bus mode.
movs r0, 0xC0
lsls r0, 8
- strh r0, [r3, 0x14]
+ strh r0, [r3, OFFSET_REG_RCNT - 0x120]
+
+; Init JOY Bus registers.
movs r0, 0x47
- strh r0, [r3, 0x20]
- strh r1, [r3, 0x38]
- ldr r3, _082DF038
- movs r0, 0x80
- strh r0, [r3, 0x2]
- ldrh r1, [r3]
+ strh r0, [r3, OFFSET_REG_JOYCNT - 0x120]
+ strh r1, [r3, OFFSET_REG_JOYSTAT - 0x120]
+
+ ldr r3, pool_InterruptRegs
+
+; Acknowledge serial interrupt.
+ movs r0, INTR_FLAG_SERIAL
+ strh r0, [r3, OFFSET_REG_IF - 0x200]
+
+; Enable serial interrupt.
+ ldrh r1, [r3, OFFSET_REG_IE - 0x200]
orrs r1, r0
- strh r1, [r3]
- strh r2, [r3, 0x8]
+ strh r1, [r3, OFFSET_REG_IE - 0x200]
+
+; Restore IME register.
+ strh r2, [r3, OFFSET_REG_IME - 0x200]
+
bx lr
- thumb_func_end sub_82DEE98
+ thumb_func_end GameCubeMultiBoot_Init
+
+ non_word_aligned_thumb_func_start GameCubeMultiBoot_HandleSerialInterrupt
+; void GameCubeMultiBoot_HandleSerialInterrupt(struct GameCubeMultiBoot *mb);
+GameCubeMultiBoot_HandleSerialInterrupt: ; 82DEEE2
+ ldr r3, pool_SerialRegs
+
+; Acknowledge reset/receive/send flags.
+ ldrh r1, [r3, OFFSET_REG_JOYCNT - 0x120]
+ strh r1, [r3, OFFSET_REG_JOYCNT - 0x120]
- non_word_aligned_thumb_func_start sub_82DEEE2
-sub_82DEEE2: ; 82DEEE2
- ldr r3, _082DF03C
- ldrh r1, [r3, 0x20]
- strh r1, [r3, 0x20]
movs r2, 0
strb r2, [r0]
- ldr r2, [r0, 0x28]
+
+ ldr r2, [r0, GCMB_STRUCT_SERIAL_INTR_HANDLER]
cmp r2, 0
- beq _082DEF04
- lsrs r1, 1
- bcs _082DEF06
+ beq GameCubeMultiBoot_HandleSerialInterruptDone
+
+ lsrs r1, 1 ; was a device reset command received?
+ bcs GameCubeMultiBoot_BeginHandshake ; branch if so
+
mov pc, r2
-_082DEEF8:
+
+ .align 2, 0
+
+; Zero the status and the interrupt handler pointer.
+; Commands from the GameCube will not be processed after this is executed
+; unless GameCubeMultiBoot_Init() is called again.
+GcMbIntrHandler_Stop:
movs r2, 0
- strh r2, [r3, 0x38]
-_082DEEFC:
- str r2, [r0, 0x28]
-_082DEEFE:
- ldr r3, _082DF040
- ldrh r1, [r3, 0x2]
+ strh r2, [r3, OFFSET_REG_JOYSTAT - 0x120]
+
+GameCubeMultiBoot_SetInterruptHandler:
+ str r2, [r0, GCMB_STRUCT_SERIAL_INTR_HANDLER]
+
+GameCubeMultiBoot_ReadVCount:
+ ldr r3, pool_RegDispstat
+ ldrh r1, [r3, OFFSET_REG_VCOUNT - OFFSET_REG_DISPSTAT]
strb r1, [r0, 0x3]
-_082DEF04:
+
+GameCubeMultiBoot_HandleSerialInterruptDone:
bx lr
-_082DEF06:
- ldr r1, [r3, 0x30]
- ldr r1, _082DF044
- str r1, [r3, 0x34]
+
+GameCubeMultiBoot_BeginHandshake:
+ ldr r1, [r3, OFFSET_REG_JOY_RECV - 0x120]
+ ldr r1, pool_RubyUSAGameCode
+ str r1, [r3, OFFSET_REG_JOY_TRANS - 0x120]
movs r1, 0x10
- strh r1, [r3, 0x38]
+ strh r1, [r3, OFFSET_REG_JOYSTAT - 0x120]
ldrb r1, [r0, 0x3]
strb r1, [r0, 0x9]
ldrb r1, [r0, 0x2]
cmp r1, 0
- bne _082DEEF8
- ldr r1, _082DF048
- str r1, [r0, 0x20]
- str r1, [r0, 0x24]
- adr r2, .L082DEF24
- b _082DEEFC
- thumb_func_end sub_82DEEE2
-
- thumb_func_start sub_82DEF24
-.L082DEF24:
-sub_82DEF24: ; 82DEF24
+ bne GcMbIntrHandler_Stop
+ ldr r1, pool_MultiBootLoadAddr
+ str r1, [r0, GCMB_STRUCT_BASE_DEST_PTR]
+ str r1, [r0, GCMB_STRUCT_CUR_DEST_PTR]
+ adr r2, GcMbIntrHandler_CheckGameCodeSent
+ b GameCubeMultiBoot_SetInterruptHandler
+
+ .align 2, 0
+
+GcMbIntrHandler_CheckGameCodeSent: ; 82DEF24
lsls r1, 31
- bcc _082DEEF8
- bmi _082DEF34
- adr r2, .L082DEF30
- b _082DEEFC
- thumb_func_end sub_82DEF24
-
- thumb_func_start sub_82DEF30
-.L082DEF30:
-sub_82DEF30: ; 82DEF30
- lsrs r1, 1
- bcc _082DEEF8
-_082DEF34:
- ldr r1, [r3, 0x30]
- ldr r2, _082DF044
+ bcc GcMbIntrHandler_Stop ; stop if send failed
+ bmi GameCubeMultiBoot_CheckHandshakeResponse ; branch if receive is complete
+
+; If the response hasn't been fully received yet,
+; check again upon the next interrupt.
+ adr r2, GcMbIntrHandler_CheckHandshakeResponse
+ b GameCubeMultiBoot_SetInterruptHandler
+
+ .align 2, 0
+
+GcMbIntrHandler_CheckHandshakeResponse: ; 82DEF30
+ lsrs r1, 1 ; is receive complete?
+ bcc GcMbIntrHandler_Stop ; stop if not
+
+GameCubeMultiBoot_CheckHandshakeResponse:
+ ldr r1, [r3, OFFSET_REG_JOY_RECV - 0x120]
+ ldr r2, pool_RubyUSAGameCode
cmp r1, r2
- bne _082DEEF8
+ bne GcMbIntrHandler_Stop ; stop if the GameCube didn't reply with the same game code
ldrb r1, [r0, 0x3]
strb r1, [r0, 0xB]
- adr r2, .L082DEF44
- b _082DEEFC
- thumb_func_end sub_82DEF30
+ adr r2, GcMbIntrHandler_82DEF44
+ b GameCubeMultiBoot_SetInterruptHandler
- thumb_func_start sub_82DEF44
-.L082DEF44:
-sub_82DEF44: ; 82DEF44
- lsrs r1, 1
- bcc _082DEEF8
- ldr r1, [r3, 0x30]
+ .align 2, 0
+
+GcMbIntrHandler_82DEF44: ; 82DEF44
+ lsrs r1, 1 ; is receive complete?
+ bcc GcMbIntrHandler_Stop ; branch if not
+ ldr r1, [r3, OFFSET_REG_JOY_RECV - 0x120]
lsrs r2, r1, 24
cmp r2, 0xDD
- bne _082DEEF8
+ bne GcMbIntrHandler_Stop
str r1, [r0, 0x4]
ldrb r1, [r0, 0x1]
strb r1, [r0, 0xA]
@@ -310,139 +374,166 @@ _082DEF70:
_082DEF72:
ldr r1, [r0, 0x8]
adds r1, 0xEE
- ldr r3, _082DF03C
- str r1, [r3, 0x34]
+ ldr r3, pool_SerialRegs
+ str r1, [r3, OFFSET_REG_JOY_TRANS - 0x120]
movs r1, 0x30
- strh r1, [r3, 0x38]
- adr r2, .L082DEF84
- b _082DEEFC
- thumb_func_end sub_82DEF44
-
- thumb_func_start sub_82DEF84
-.L082DEF84:
-sub_82DEF84: ; 82DEF84
+ strh r1, [r3, OFFSET_REG_JOYSTAT - 0x120]
+ adr r2, GcMbIntrHandler_82DEF84
+ b GameCubeMultiBoot_SetInterruptHandler
+
+ .align 2, 0
+
+GcMbIntrHandler_82DEF84: ; 82DEF84
lsls r1, 31
- bcc _082DEEF8
- bmi _082DEF94
- adr r2, .L082DEF90
- b _082DEEFC
- thumb_func_end sub_82DEF84
-
- thumb_func_start sub_82DEF90
-.L082DEF90:
-sub_82DEF90: ; 82DEF90
- lsrs r1, 1
- bcc _082DEEF8
+ bcc GcMbIntrHandler_Stop ; stop if send failed
+ bmi _082DEF94 ; branch if receive is complete
+ adr r2, GcMbIntrHandler_82DEF90
+ b GameCubeMultiBoot_SetInterruptHandler
+
+ .align 2, 0
+
+GcMbIntrHandler_82DEF90: ; 82DEF90
+ lsrs r1, 1 ; is receive complete?
+ bcc GcMbIntrHandler_Stop ; branch if not
_082DEF94:
- ldr r1, [r3, 0x30]
+ ldr r1, [r3, OFFSET_REG_JOY_RECV - 0x120]
ldr r2, _082DF034
cmp r1, r2
- bcs _082DEEF8
+ bhs GcMbIntrHandler_Stop
adds r1, 0x1
adds r1, r1
strh r1, [r0, 0x12]
ldrb r1, [r0, 0x2]
cmp r1, 0
_082DEFA6:
- bne _082DEEF8
- ldr r1, _082DF048
- str r1, [r0, 0x20]
- str r1, [r0, 0x24]
- adr r2, .L082DEFB4
- b _082DEEFC
- thumb_func_end sub_82DEF90
-
- thumb_func_start sub_82DEFB4
-.L082DEFB4:
-sub_82DEFB4: ; 82DEFB4
- lsrs r1, 1
- bcc _082DEEF8
- ldr r2, [r0, 0x24]
+ bne GcMbIntrHandler_Stop
+ ldr r1, pool_MultiBootLoadAddr
+ str r1, [r0, GCMB_STRUCT_BASE_DEST_PTR]
+ str r1, [r0, GCMB_STRUCT_CUR_DEST_PTR]
+ adr r2, GcMbIntrHandler_82DEFB4
+ b GameCubeMultiBoot_SetInterruptHandler
+
+ .align 2, 0
+
+GcMbIntrHandler_82DEFB4: ; 82DEFB4
+ lsrs r1, 1 ; is receive complete?
+ bcc GcMbIntrHandler_Stop ; branch if not
+ ldr r2, [r0, GCMB_STRUCT_CUR_DEST_PTR]
movs r1, 0x4
ands r1, r2
adds r1, 0x8
lsls r1, 2
- strh r1, [r3, 0x38]
- ldr r1, [r3, 0x30]
+ strh r1, [r3, OFFSET_REG_JOYSTAT - 0x120]
+ ldr r1, [r3, OFFSET_REG_JOY_RECV - 0x120]
stm r2!, {r1}
- str r2, [r0, 0x24]
+ str r2, [r0, GCMB_STRUCT_CUR_DEST_PTR]
ldrh r1, [r0, 0x12]
subs r1, 0x1
strh r1, [r0, 0x12]
- bne _082DEEFE
+ bne GameCubeMultiBoot_ReadVCount
+
_082DEFD2:
ldrb r1, [r0, 0x1]
lsls r1, 8
adds r1, 0xCC
- str r1, [r3, 0x34]
+ str r1, [r3, OFFSET_REG_JOY_TRANS - 0x120]
adr r2, _082DEFE0
- b _082DEEFC
+ b GameCubeMultiBoot_SetInterruptHandler
+
.align 2, 0
+
_082DEFE0:
lsls r1, 31
+
_082DEFE2:
- bcc _082DEEF8
+ bcc GcMbIntrHandler_Stop
ldr r1, [r0, 0x1C]
cmp r1, 0
beq _082DEFD2
- str r1, [r3, 0x34]
- adr r2, .L082DEFF0
- b _082DEEFC
- thumb_func_end sub_82DEFB4
-
- thumb_func_start sub_82DEFF0
-.L082DEFF0:
-sub_82DEFF0: ; 82DEFF0
+ str r1, [r3, OFFSET_REG_JOY_TRANS - 0x120]
+ adr r2, GcMbIntrHandler_82DEFF0
+ b GameCubeMultiBoot_SetInterruptHandler
+
+ .align 2, 0
+
+GcMbIntrHandler_82DEFF0: ; 82DEFF0
lsls r1, 31
- bcc _082DEFE2
- bmi _082DF000
- adr r2, .L082DEFFC
- b _082DEEFC
+ bcc _082DEFE2 ; branch if send failed
+ bmi _082DF000 ; branch if receive is complete
+ adr r2, GcMbIntrHandler_82DEFFC
+ b GameCubeMultiBoot_SetInterruptHandler
+
.align 2, 0
-.L082DEFFC:
-_082DEFFC:
- lsrs r1, 1
- bcc _082DEFE2
+
+GcMbIntrHandler_82DEFFC: ; 82DEFFC
+ lsrs r1, 1 ; is receive complete?
+ bcc _082DEFE2 ; branch if not
+
_082DF000:
- ldr r1, [r3, 0x30]
+ ldr r1, [r3, OFFSET_REG_JOY_RECV - 0x120]
lsrs r2, r1, 24
cmp r2, 0xBB
bne _082DEFA6
strh r1, [r0, 0x10]
- adr r2, .L082DF010
- b _082DEEFC
- thumb_func_end sub_82DEFF0
-
- thumb_func_start sub_82DF010
-.L082DF010:
-sub_82DF010: ; 82DF010
- b _082DEEF8
- thumb_func_end sub_82DF010
-
- non_word_aligned_thumb_func_start sub_82DF012
-sub_82DF012: ; 82DF012
- ldr r3, _082DF038
- ldrh r2, [r3, 0x8]
+ adr r2, GcMbIntrHandler_82DF010
+ b GameCubeMultiBoot_SetInterruptHandler
+
+ .align 2, 0
+
+GcMbIntrHandler_82DF010: ; 82DF010
+ b GcMbIntrHandler_Stop
+
+ thumb_func_end GameCubeMultiBoot_HandleSerialInterrupt
+
+ non_word_aligned_thumb_func_start GameCubeMultiBoot_Quit
+; void GameCubeMultiBoot_Quit();
+GameCubeMultiBoot_Quit: ; 82DF012
+ ldr r3, pool_InterruptRegs
+
+; Save IME register.
+ ldrh r2, [r3, OFFSET_REG_IME - 0x200]
+
+; Disable interrupts.
movs r1, 0
- strh r1, [r3, 0x8]
- ldr r3, _082DF03C
+ strh r1, [r3, OFFSET_REG_IME - 0x200]
+
+ ldr r3, pool_SerialRegs
+
+; Acknowledge all JOYCNT flags.
movs r0, 0x7
- strh r0, [r3, 0x20]
+ strh r0, [r3, OFFSET_REG_JOYCNT - 0x120]
+
+; Turn off JOY Bus mode.
lsls r0, r3, 10
- strh r0, [r3, 0x14]
- ldr r3, _082DF038
- movs r0, 0x80
- strh r0, [r3, 0x2]
- ldrh r1, [r3]
+ strh r0, [r3, OFFSET_REG_RCNT - 0x120] ; store 0x8000
+
+ ldr r3, pool_InterruptRegs
+
+; Acknowledge serial interrupt.
+ movs r0, INTR_FLAG_SERIAL
+ strh r0, [r3, OFFSET_REG_IF - 0x200]
+
+; Disable serial interrupt.
+ ldrh r1, [r3, OFFSET_REG_IE - 0x200]
bics r1, r0
- strh r1, [r3]
- strh r2, [r3, 0x8]
+ strh r1, [r3, OFFSET_REG_IE - 0x200]
+
+; Restore IME register.
+ strh r2, [r3, OFFSET_REG_IME - 0x200]
+
bx lr
+ thumb_func_end GameCubeMultiBoot_Quit
+
.align 2, 0
-_082DF034: .4byte 0x00004000
-_082DF038: .4byte 0x04000200
-_082DF03C: .4byte 0x04000120
-_082DF040: .4byte 0x04000004
-_082DF044: .4byte 0x45565841
-_082DF048: .4byte 0x02000000
- thumb_func_end sub_82DF012
+
+_082DF034: .4byte 0x4000
+
+pool_InterruptRegs: .4byte REG_BASE + 0x200
+
+pool_SerialRegs: .4byte REG_BASE + 0x120
+
+pool_RegDispstat: .4byte REG_DISPSTAT
+
+pool_RubyUSAGameCode: .ascii "AXVE"
+
+pool_MultiBootLoadAddr: .4byte EWRAM_START
diff --git a/asm/rom_header.s b/asm/rom_header.s
index a9cbf9429..e03b9ceb3 100644
--- a/asm/rom_header.s
+++ b/asm/rom_header.s
@@ -1,5 +1,3 @@
- b Init
-
RomHeaderNintendoLogo:
.incbin "base_emerald.gba", 0x4, 0xA0 - 0x4
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-17 21:10:08 +0000