41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
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#include "libultra_internal.h"
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#include "osAi.h"
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#include "hardware.h"
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u8 D_80334820 = 0;
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/**
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* It is worth noting that a previous hardware bug has been fixed by a software
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* patch in osAiSetNextBuffer. This bug occurred when the address of the end of the
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* buffer specified by osAiSetNextBuffer was at a specific value. This value
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* occurred when the following was true:
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*
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* (vaddr + nbytes) & 0x00003FFF == 0x00002000
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*
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* (when the buffer ends with address of lower 14 bits 0x2000) In this case, the
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* DMA transfer does not complete successfully. This can cause clicks and pops in
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* the audio output. This bug no longer requires special handling by the application
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* because it is now patched by osAiSetNextBuffer.
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*/
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s32 osAiSetNextBuffer(void *buff, u32 len) {
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u8 *sp1c = buff;
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if (D_80334820 != 0) {
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sp1c -= 0x2000;
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}
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if ((((uintptr_t) buff + len) & 0x3fff) == 0x2000) {
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D_80334820 = 1;
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} else {
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D_80334820 = 0;
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}
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if (__osAiDeviceBusy()) {
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return -1;
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}
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HW_REG(AI_DRAM_ADDR_REG, void *) = (void *) osVirtualToPhysical(sp1c);
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HW_REG(AI_LEN_REG, u32) = len;
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return 0;
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}
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