mirror of
https://github.com/ApacheThunder/XuluMenu.git
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73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
#define ARM9
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#undef ARM7
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#include <nds/ndstypes.h>
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#include <nds/dma.h>
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#include <nds/system.h>
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#include <nds/interrupts.h>
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#include <nds/timers.h>
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#include <nds/memory.h>
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#include <nds/arm9/video.h>
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#include <nds/arm9/input.h>
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#include "boot.h"
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/*-------------------------------------------------------------------------
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resetMemory2_ARM9
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Clears the ARM9's DMA channels and resets video memory
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Written by Darkain.
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Modified by Chishm:
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* Changed MultiNDS specific stuff
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--------------------------------------------------------------------------*/
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void __attribute__ ((long_call)) __attribute__((naked)) __attribute__((noreturn)) resetMemory2_ARM9 (void)
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{
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register int i;
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//clear out ARM9 DMA channels
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for (i=0; i<4; i++) {
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DMA_CR(i) = 0;
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DMA_SRC(i) = 0;
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DMA_DEST(i) = 0;
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TIMER_CR(i) = 0;
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TIMER_DATA(i) = 0;
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}
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// Removed VRAM/Screen clearing code to speed up transition. Things seem to boot fine without it.
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//set shared ram to ARM7
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WRAM_CR = 0x03;
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// Return to passme loop
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*((vu32*)0x02FFFE04) = (u32)0xE59FF018; // ldr pc, 0x02FFFE24
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*((vu32*)0x02FFFE24) = (u32)0x02FFFE04; // Set ARM9 Loop address
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asm volatile(
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"\tbx %0\n"
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: : "r" (0x02FFFE04)
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);
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while(1);
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}
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/*-------------------------------------------------------------------------
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startBinary_ARM9
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Jumps to the ARM9 NDS binary in sync with the display and ARM7
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Written by Darkain.
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Modified by Chishm:
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* Removed MultiNDS specific stuff
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--------------------------------------------------------------------------*/
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void __attribute__ ((long_call)) __attribute__((noreturn)) __attribute__((naked)) startBinary_ARM9 (void)
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{
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REG_IME=0;
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REG_EXMEMCNT = 0xE880;
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// set ARM9 load address to 0 and wait for it to change again
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ARM9_START_FLAG = 0;
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while(REG_VCOUNT!=191);
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while(REG_VCOUNT==191);
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while ( ARM9_START_FLAG != 1 );
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VoidFn arm9code = *(VoidFn*)(0x2FFFE24);
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arm9code();
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while(1);
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}
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