mirror of
https://github.com/n64decomp/sm64.git
synced 2024-11-12 04:15:02 -05:00
41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
#include "libultra_internal.h"
|
|
#include "osAi.h"
|
|
#include "hardware.h"
|
|
|
|
u8 D_80334820 = 0;
|
|
|
|
/**
|
|
* It is worth noting that a previous hardware bug has been fixed by a software
|
|
* patch in osAiSetNextBuffer. This bug occurred when the address of the end of the
|
|
* buffer specified by osAiSetNextBuffer was at a specific value. This value
|
|
* occurred when the following was true:
|
|
*
|
|
* (vaddr + nbytes) & 0x00003FFF == 0x00002000
|
|
*
|
|
* (when the buffer ends with address of lower 14 bits 0x2000) In this case, the
|
|
* DMA transfer does not complete successfully. This can cause clicks and pops in
|
|
* the audio output. This bug no longer requires special handling by the application
|
|
* because it is now patched by osAiSetNextBuffer.
|
|
*/
|
|
|
|
s32 osAiSetNextBuffer(void *buff, u32 len) {
|
|
u8 *sp1c = buff;
|
|
if (D_80334820 != 0) {
|
|
sp1c -= 0x2000;
|
|
}
|
|
|
|
if ((((uintptr_t) buff + len) & 0x3fff) == 0x2000) {
|
|
D_80334820 = 1;
|
|
} else {
|
|
D_80334820 = 0;
|
|
}
|
|
|
|
if (__osAiDeviceBusy()) {
|
|
return -1;
|
|
}
|
|
|
|
HW_REG(AI_DRAM_ADDR_REG, void *) = (void *) osVirtualToPhysical(sp1c);
|
|
HW_REG(AI_LEN_REG, u32) = len;
|
|
return 0;
|
|
}
|