src/dolphin/dsp/dsp.c


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#include "dolphin/dsp.h"

const char* __DSPVersion = "<< Dolphin SDK - DSP\trelease build: Sep  5 2002 05:35:13 (0x2301) >>";

extern DSPTaskInfo* __DSP_rude_task;
extern int __DSP_rude_task_pending;

static BOOL __DSP_init_flag;

extern void __DSPHandler(__OSInterrupt, OSContext*);

u32 DSPCheckMailToDSP(void) {
    return (__DSPRegs[0] & (1 << 15)) >> 15;
}

u32 DSPCheckMailFromDSP(void) {
    return (__DSPRegs[2] & (1 << 15)) >> 15;
}

u32 DSPReadMailFromDSP(void) {
    return (__DSPRegs[2] << 16) | __DSPRegs[3];
}

void DSPSendMailToDSP(u32 mail) {
    __DSPRegs[0] = mail >> 16;
    __DSPRegs[1] = mail & 0xFFFF;
}

void DSPAssertInt(void) {
    BOOL old;
    u16 tmp;

    old = OSDisableInterrupts();
    tmp = __DSPRegs[5];
    tmp = (tmp & ~0xA8) | 2;
    __DSPRegs[5] = tmp;
    OSRestoreInterrupts(old);
}

void DSPInit(void) {
    BOOL old;
    u16 tmp;

    __DSP_debug_printf("DSPInit(): Build Date: %s %s\n", "Sep  5 2002", "05:35:13");

    if (__DSP_init_flag == 1)
        return;

    OSRegisterVersion(__DSPVersion);

    old = OSDisableInterrupts();
    __OSSetInterruptHandler(7, __DSPHandler);
    __OSUnmaskInterrupts(OS_INTERRUPTMASK_DSP_DSP);

    tmp = __DSPRegs[5];
    tmp = (tmp & ~0xA8) | 0x800;
    __DSPRegs[5] = tmp;

    tmp = __DSPRegs[5];
    __DSPRegs[5] = tmp = tmp & ~0xAC;

    __DSP_first_task = __DSP_last_task = __DSP_curr_task = __DSP_tmp_task = NULL;
    __DSP_init_flag = 1;

    OSRestoreInterrupts(old);
}