Shipwright/soh/src/libultra/io/aisetnextbuf.c

32 lines
871 B
C
Raw Normal View History

#include "global.h"
//! Note that this is not the same as the original libultra
//! osAiSetNextBuffer, see comments in the function
s32 osAiSetNextBuffer(void* buf, size_t size) {
static u8 D_80130500 = false;
uintptr_t bufAdjusted = (uintptr_t)buf;
s32 status;
if (D_80130500) {
bufAdjusted = (uintptr_t)buf - 0x2000;
}
if ((((uintptr_t)buf + size) & 0x1FFF) == 0) {
D_80130500 = true;
} else {
D_80130500 = false;
}
// Originally a call to __osAiDeviceBusy
status = HW_REG(AI_STATUS_REG, s32);
if (status & AI_STATUS_AI_FULL) {
return -1;
}
// OS_K0_TO_PHYSICAL replaces osVirtualToPhysical, this replacement
// assumes that only KSEG0 addresses are given
HW_REG(AI_DRAM_ADDR_REG, u32) = OS_K0_TO_PHYSICAL(bufAdjusted);
HW_REG(AI_LEN_REG, u32) = size;
return 0;
}