__osSiRawStartDma.c

#include "libultra_internal.h"
#include "hardware.h"

s32 __osSiRawStartDma(s32 dir, void *addr) {
    if (__osSiDeviceBusy()) {
        return -1;
    }

    if (dir == OS_WRITE) {
        osWritebackDCache(addr, 64);
    }

    HW_REG(SI_DRAM_ADDR_REG, void *) = (void *) osVirtualToPhysical(addr);

    if (dir == OS_READ) {
        HW_REG(SI_PIF_ADDR_RD64B_REG, u32) = 0x1FC007C0;
    } else {
        HW_REG(SI_PIF_ADDR_WR64B_REG, u32) = 0x1FC007C0;
    }

    if (dir == OS_READ) {
        osInvalDCache(addr, 64);
    }
    return 0;
}