sm64pc/lib/src/osEepromRead.c

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#include "libultra_internal.h"
extern u8 D_80365D20;
typedef struct {
u16 unk00;
u8 unk02;
u8 unk03;
} unkStruct;
typedef struct {
u8 unk00;
u8 unk01;
u8 unk02;
u8 unk03;
u8 unk04;
u8 unk05;
u8 unk06;
u8 unk07;
} unkStruct3;
typedef struct {
u8 unk00;
u8 unk01;
u8 unk02;
u8 unk03;
unkStruct3 unk04;
} unkStruct2;
s32 __osEepStatus(OSMesgQueue *, unkStruct *);
s32 __osPackEepReadData(u8);
s32 osEepromRead(OSMesgQueue *mq, u8 address, u8 *buffer) {
s32 sp34;
s32 sp30;
u8 *sp2c;
unkStruct sp28;
unkStruct2 sp20;
sp34 = 0;
sp30 = 0;
sp2c = (u8 *) &D_80365E00;
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if (address > 0x40) {
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return -1;
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}
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__osSiGetAccess();
sp34 = __osEepStatus(mq, &sp28);
if (sp34 != 0 || sp28.unk00 != 0x8000) {
return 8;
}
while (sp28.unk02 & 0x80) {
__osEepStatus(mq, &sp28);
}
__osPackEepReadData(address);
sp34 = __osSiRawStartDma(OS_WRITE, &D_80365E00);
osRecvMesg(mq, NULL, OS_MESG_BLOCK);
for (sp30 = 0; sp30 < 0x10; sp30++) {
(D_80365E00)[sp30] = 255;
}
D_80365E3C = 0;
sp34 = __osSiRawStartDma(OS_READ, D_80365E00);
D_80365D20 = 4;
osRecvMesg(mq, NULL, OS_MESG_BLOCK);
for (sp30 = 0; sp30 < 4; sp30++) {
sp2c++;
}
sp20 = *(unkStruct2 *) sp2c;
sp34 = (sp20.unk01 & 0xc0) >> 4;
if (sp34 == 0) {
for (sp30 = 0; sp30 < 8; sp30++) {
*buffer++ = ((u8 *) &sp20.unk04)[sp30];
}
}
__osSiRelAccess();
return sp34;
}
s32 __osPackEepReadData(u8 address) {
u8 *sp14;
unkStruct2 sp8;
s32 sp4;
sp14 = (u8 *) &D_80365E00;
for (sp4 = 0; sp4 < 0x10; sp4++) {
D_80365E00[sp4] = 255;
}
D_80365E3C = 1;
sp8.unk00 = 2;
sp8.unk01 = 8;
sp8.unk02 = 4;
sp8.unk03 = address;
for (sp4 = 0; sp4 < 8; sp4++) {
((u8 *) &sp8.unk04)[sp4] = 0;
}
for (sp4 = 0; sp4 < 4; sp4++) {
*sp14++ = 0;
}
*(unkStruct2 *) sp14 = sp8;
sp14 += 0xc;
*sp14 = 254;
}