diff options
Diffstat (limited to 'asm/libgcnmultiboot.s')
| -rw-r--r-- | asm/libgcnmultiboot.s | 550 |
1 files changed, 0 insertions, 550 deletions
diff --git a/asm/libgcnmultiboot.s b/asm/libgcnmultiboot.s deleted file mode 100644 index 0e418e51f..000000000 --- a/asm/libgcnmultiboot.s +++ /dev/null @@ -1,550 +0,0 @@ -@ 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. - - .include "asm/macros.inc" - .include "constants/constants.inc" - - .equiv GCMB_STRUCT_BASE_DEST_PTR, 0x20 - .equiv GCMB_STRUCT_CUR_DEST_PTR, 0x24 - .equiv GCMB_STRUCT_SERIAL_INTR_HANDLER, 0x28 - - .equiv ROM_HEADER_NINTENDO_LOGO_OFFSET, 0x4 - - .syntax unified - - .text - - thumb_func_start GameCubeMultiBoot_Hash -GameCubeMultiBoot_Hash: @ 82DED70 - push {r4,lr} - ldr r4, pool_HashVal - eors r3, r1 - movs r2, 0x20 - -GameCubeMultiBoot_Hash_Loop: - lsrs r3, 1 - bcc GameCubeMultiBoot_Hash_SkipEor - - eors r3, r4 - -GameCubeMultiBoot_Hash_SkipEor: - subs r2, 0x1 - bne GameCubeMultiBoot_Hash_Loop - - pop {r4,pc} - thumb_func_end GameCubeMultiBoot_Hash - - 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] - adds r1, 0x1 - strb r1, [r0, 0x1] - ldrb r1, [r0, 0x2] - cmp r1, 0x2 - beq _082DEDF4 - ldr r3, pool_InterruptRegs - ldrh r2, [r3, OFFSET_REG_IME - 0x200] - movs r1, 0 - 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, OFFSET_REG_IME - 0x200] -_082DEDAA: - bcs GameCubeMultiBoot_Init - ldrb r1, [r0, 0x2] - cmp r1, 0 - bne _082DEDF6 - 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, ROM_HEADER_NINTENDO_LOGO_OFFSET - ldr r4, pool_NintendoLogo -_082DEDC6: - ldm r2!, {r5} - ldm r4!, {r6} - cmp r5, r6 - bne _082DEDDC - subs r1, 0x4 - bne _082DEDC6 - ldm r2!, {r5} - ldm r4!, {r6} - eors r5, r6 - lsrs r5, 8 - str r2, [r0, GCMB_STRUCT_BASE_DEST_PTR] -_082DEDDC: - pop {r4-r6} - 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, pool_Kawa - muls r1, r2 - adds r1, 0x1 - str r1, [r0, 0x14] -_082DEDF4: - bx lr -_082DEDF6: - ldr r1, [r0, GCMB_STRUCT_CUR_DEST_PTR] - mov r12, r1 - ldr r3, [r0, 0x18] - push {r4-r7} - ldr r4, [r0, GCMB_STRUCT_BASE_DEST_PTR] - ldr r5, pool_Kawa - ldr r6, [r0, 0x14] - ldr r7, pool_HashVal -_082DEE06: - cmp r4, r12 - bcs _082DEE26 - ldr r1, [r4] - eors r1, r6 - adds r1, r3 - stm r4!, {r1} - eors r3, r1 - movs r2, 0x20 -_082DEE16: - lsrs r3, 1 - bcc _082DEE1C - eors r3, r7 -_082DEE1C: - subs r2, 0x1 - bne _082DEE16 - muls r6, r5 - adds r6, 0x1 - b _082DEE06 -_082DEE26: - 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, GCMB_STRUCT_CUR_DEST_PTR] - ldr r2, [r0, GCMB_STRUCT_BASE_DEST_PTR] - cmp r1, r2 - bne _082DEE76 - ldr r1, [r0, 0xC] - cmp r1, 0 - beq _082DEE60 - ldrh r1, [r0, 0x10] - cmp r1, 0 - beq _082DEDF4 - mov r12, lr - movs r1, 0xBB - ldr r3, [r0, 0xC] - bl GameCubeMultiBoot_Hash - ldrh r1, [r0, 0x10] - mov lr, r12 - subs r1, r3 - bne GameCubeMultiBoot_Init - movs r1, 0x2 - strb r1, [r0, 0x2] - bx lr -_082DEE60: - mov r12, lr - ldrb r1, [r0, 0x3] - lsls r1, 24 - subs r1, 0x1 - str r1, [r0, 0xC] - 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 - -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 GameCubeMultiBoot_ExecuteProgram_Fail - ldr r3, pool_InterruptRegs - movs r1, 0 - strh r1, [r3, OFFSET_REG_IME - 0x200] - ldr r1, pool_MultiBootLoadAddr - adds r1, 0xC0 - bx r1 -GameCubeMultiBoot_ExecuteProgram_Fail: - bx lr - 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] - -@ Disable interrupts. - movs r1, 0 - 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, GCMB_STRUCT_BASE_DEST_PTR - -@ clear all but the last 3 fields of the struct -GameCubeMultiBoot_Init_ClearStructLoop: - stm r0!, {r1} - cmp r0, r3 - blo GameCubeMultiBoot_Init_ClearStructLoop - - pop {r0,r3} - lsrs r3, 1 - strb r3, [r0, 0x3] - pop {r3} - strb r3, [r0, 0x1] - - ldr r3, pool_SerialRegs - -@ Turn off JOY Bus mode. - lsls r0, r3, 10 - strh r0, [r3, OFFSET_REG_RCNT - 0x120] - -@ Turn on JOY Bus mode. - movs r0, 0xC0 - lsls r0, 8 - strh r0, [r3, OFFSET_REG_RCNT - 0x120] - -@ Init JOY Bus registers. - movs r0, 0x47 - 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, OFFSET_REG_IE - 0x200] - -@ Restore IME register. - strh r2, [r3, OFFSET_REG_IME - 0x200] - - bx lr - 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] - - movs r2, 0 - strb r2, [r0] - - ldr r2, [r0, GCMB_STRUCT_SERIAL_INTR_HANDLER] - cmp r2, 0 - beq GameCubeMultiBoot_HandleSerialInterruptDone - - lsrs r1, 1 @ was a device reset command received? - bcs GameCubeMultiBoot_BeginHandshake @ branch if so - - mov pc, r2 - - .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, 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] - -GameCubeMultiBoot_HandleSerialInterruptDone: - bx lr - -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, OFFSET_REG_JOYSTAT - 0x120] - ldrb r1, [r0, 0x3] - strb r1, [r0, 0x9] - ldrb r1, [r0, 0x2] - cmp r1, 0 - 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 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 GcMbIntrHandler_Stop @ stop if the GameCube didn't reply with the same game code - ldrb r1, [r0, 0x3] - strb r1, [r0, 0xB] - adr r2, GcMbIntrHandler_82DEF44 - b GameCubeMultiBoot_SetInterruptHandler - - .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 GcMbIntrHandler_Stop - str r1, [r0, 0x4] - ldrb r1, [r0, 0x1] - strb r1, [r0, 0xA] - movs r2, 0 - movs r3, 0 - ldr r1, [r0, 0x8] - lsrs r1, 8 -_082DEF5E: - lsrs r1, 1 - adcs r2, r3 - cmp r1, 0 - bne _082DEF5E - cmp r2, 0xE - bgt _082DEF70 - cmp r2, 0x7 - bge _082DEF72 - movs r1, 0xFF -_082DEF70: - strb r1, [r0, 0xA] -_082DEF72: - ldr r1, [r0, 0x8] - adds r1, 0xEE - ldr r3, pool_SerialRegs - str r1, [r3, OFFSET_REG_JOY_TRANS - 0x120] - movs r1, 0x30 - strh r1, [r3, OFFSET_REG_JOYSTAT - 0x120] - adr r2, GcMbIntrHandler_82DEF84 - b GameCubeMultiBoot_SetInterruptHandler - - .align 2, 0 - -GcMbIntrHandler_82DEF84: @ 82DEF84 - lsls r1, 31 - 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, OFFSET_REG_JOY_RECV - 0x120] - ldr r2, _082DF034 - cmp r1, r2 - bhs GcMbIntrHandler_Stop - adds r1, 0x1 - adds r1, r1 - strh r1, [r0, 0x12] - ldrb r1, [r0, 0x2] - cmp r1, 0 -_082DEFA6: - 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, OFFSET_REG_JOYSTAT - 0x120] - ldr r1, [r3, OFFSET_REG_JOY_RECV - 0x120] - stm r2!, {r1} - str r2, [r0, GCMB_STRUCT_CUR_DEST_PTR] - ldrh r1, [r0, 0x12] - subs r1, 0x1 - strh r1, [r0, 0x12] - bne GameCubeMultiBoot_ReadVCount - -_082DEFD2: - ldrb r1, [r0, 0x1] - lsls r1, 8 - adds r1, 0xCC - str r1, [r3, OFFSET_REG_JOY_TRANS - 0x120] - adr r2, _082DEFE0 - b GameCubeMultiBoot_SetInterruptHandler - - .align 2, 0 - -_082DEFE0: - lsls r1, 31 - -_082DEFE2: - bcc GcMbIntrHandler_Stop - ldr r1, [r0, 0x1C] - cmp r1, 0 - beq _082DEFD2 - 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 @ branch if send failed - bmi _082DF000 @ branch if receive is complete - adr r2, GcMbIntrHandler_82DEFFC - b GameCubeMultiBoot_SetInterruptHandler - - .align 2, 0 - -GcMbIntrHandler_82DEFFC: @ 82DEFFC - lsrs r1, 1 @ is receive complete? - bcc _082DEFE2 @ branch if not - -_082DF000: - ldr r1, [r3, OFFSET_REG_JOY_RECV - 0x120] - lsrs r2, r1, 24 - cmp r2, 0xBB - bne _082DEFA6 - strh r1, [r0, 0x10] - 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, OFFSET_REG_IME - 0x200] - - ldr r3, pool_SerialRegs - -@ Acknowledge all JOYCNT flags. - movs r0, 0x7 - strh r0, [r3, OFFSET_REG_JOYCNT - 0x120] - -@ Turn off JOY Bus mode. - lsls r0, r3, 10 - 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, 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 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 - - .align 2, 0 @ Don't pad with nop. |