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nakano: Decompile dma.c
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@entriphy
entriphy committed Jun 18, 2023
1 parent 0b2414c commit 81bc12a
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Showing 2 changed files with 194 additions and 18 deletions.
17 changes: 15 additions & 2 deletions include/nakano.h
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Original file line number Diff line number Diff line change
Expand Up @@ -348,9 +348,22 @@ static inline f32 nkRadMask(f32 rad) {
// Functions

// dma.c
extern void jDmaPauseOn();
extern void jDmaPauseOff();
extern void nkInitDma();
extern void nkDmaGifSend(void *tag);
extern void nkLoadGms(void *tag);
extern void nk_PrintOT(qword *tag);
extern void* nkAddRef(void *p1);
extern qword* nkMakeUnpackVif1(qword **pbp, void *data, s32 vu_addr, s32 qwc);
extern void nkDmaSendGif(qword *addr);
extern void nkLoadGms(qword *gms);
extern void nkClearOT(qword *tagp, s32 otn, s32 pce);
extern void nkPathReset();
extern void nkP1Flush(qword *otp);
extern void nkDebFlush();
extern void nkDmaSendVif1(qword *addr);
extern void nkDmaSendVif0(qword *addr);
extern void nkPathFlush();
extern void nkPathBlock();

// game.c
extern void nkInitPS2();
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195 changes: 179 additions & 16 deletions src/nakano/dma.c
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Original file line number Diff line number Diff line change
@@ -1,27 +1,190 @@
#include "common.h"

#define setCHCR(ch, m, t) *((u16 *)&(ch)->chcr) = (m) << D_CHCR_MOD_O | (t) << D_CHCR_TTE_O

s32 nkDmaCdNum = 0;
static char *nk_dma_mode_name[] = { "REFE", "CNT", "NEXT", "REF", "REFS", "CALL", "RET", "END" };

void jDmaPauseOn() {
while (!(DGET_D_ENABLER() & D_ENABLER_CPND_M))
DPUT_D_ENABLEW(D_ENABLER_CPND_M);
}

void jDmaPauseOff() {
while (DGET_D_ENABLER() & D_ENABLER_CPND_M)
DPUT_D_ENABLEW(0);
}

void nkInitDma() {
sceDmaReset(1);
sceDevGifPutImtMode(0);
DmaChVIF0 = sceDmaGetChan(0);
DmaChVIF0->chcr = (tD_CHCR){ .MOD = 1, .TTE = 1 };
DmaChVIF1 = sceDmaGetChan(1);
DmaChVIF1->chcr = (tD_CHCR){ .MOD = 1, .TTE = 1 };
DmaChGIF = sceDmaGetChan(2);
DmaChGIF->chcr = (tD_CHCR){ .MOD = 1 };
DmaChfromSPR = sceDmaGetChan(8);
DmaChfromSPR->chcr = (tD_CHCR){ };
DmaChtoSPR = sceDmaGetChan(9);
DmaChtoSPR->chcr = (tD_CHCR){ };
}

void nkDmaGifSend(void *tag) {
DmaChVIF0 = sceDmaGetChan(SCE_DMA_VIF0);
setCHCR(DmaChVIF0, 1, 1);
DmaChVIF1 = sceDmaGetChan(SCE_DMA_VIF1);
setCHCR(DmaChVIF1, 1, 1);
DmaChGIF = sceDmaGetChan(SCE_DMA_GIF);
setCHCR(DmaChGIF, 1, 0);
DmaChfromSPR = sceDmaGetChan(SCE_DMA_fromSPR);
setCHCR(DmaChfromSPR, 0, 0);
DmaChtoSPR = sceDmaGetChan(SCE_DMA_toSPR);
setCHCR(DmaChtoSPR, 0, 0);
}

void nk_PrintOT(qword *tag) {
u32 mode;
u32 qwc;
qword *ret_tag[2];

memset(ret_tag, 0, sizeof(ret_tag));

do {
mode = (*tag)[0] & 0x70000000;
qwc = (*tag)[0] & 0xFFFF;

switch (mode) {
case 0x00000000: // REFE
mode = 0x70000000;
break;
case 0x10000000: // CNT
tag = (qword *)tag[qwc + 1];
break;
case 0x20000000:
tag = (qword *)(*tag)[1];
break;
case 0x50000000: // CALL
if (ret_tag[1] == NULL) {
if (ret_tag[0] != NULL)
ret_tag[1] = tag + 1;
else
ret_tag[0] = tag + 1;
tag = (qword *)(*tag)[1];
} else {
mode = 0x70000000;
}
break;
case 0x60000000: // RET
if (ret_tag[1] != NULL) {
tag = ret_tag[1];
ret_tag[1] = NULL;
} else {
if (ret_tag[0] != NULL) {
tag = ret_tag[0];
ret_tag[0] = NULL;
} else {
mode = 0x70000000;
}
}
break;
case 0x30000000: // REF
case 0x40000000: // REFS
tag++;
break;
default:
break;
}
} while (mode != 0x70000000); // END
}

void* nkAddRef(void * p1) {
memcpy(p1_packet, p1, 0x10);
p1_packet++;
return p1;
}

qword* nkMakeUnpackVif1(qword **pbp, void *data, s32 vu_addr, s32 qwc) {
qword *pb;

pb = *pbp;
pb[0][0] = (qwc + 1) | 0x10000000;
pb[0][2] = pb[0][3] = pb[0][1] = 0;
pb[1][0] = pb[1][1] = pb[1][2] = 0;
pb[1][3] = vu_addr | qwc << 0x10 | 0x6C000000;
pb += 2;

while (qwc-- > 0) {
pb[0][0] = *((u32 *)data)++;
pb[0][1] = *((u32 *)data)++;
pb[0][2] = *((u32 *)data)++;
pb[0][3] = *((u32 *)data)++;
pb++;
}

*pbp = pb;
return pb;
}

void nkDmaSendGif(qword *addr) {
sceDmaSync(DmaChGIF, 0, 0);
sceDmaSend(DmaChGIF, tag);
sceDmaSend(DmaChGIF, addr);
}

void nkLoadGms(void *tag) {
void nkLoadGms(qword *gms) {
FlushCache(WRITEBACK_DCACHE);
nkDmaGifSend(tag);
nkDmaSendGif(gms);
sceGsSyncPath(0, 0);
}

void nkClearOT(qword *tagp, s32 otn, s32 pce) {
qword *uncache_tagp;
u32 mode;


uncache_tagp = (qword *)((u32)tagp | 0x20000000);
mode = 0x20000000;
while (otn-- > 0) {
(*uncache_tagp)[0] = mode;
(*uncache_tagp)[1] = (u32)(tagp + 1);
(*uncache_tagp)[3] = 0;
(*uncache_tagp)[2] = 0;

tagp++;
uncache_tagp++;
}

(*uncache_tagp)[0] = 0x70000000;
(*uncache_tagp)[1] = 0;
(*uncache_tagp)[3] = 0;
(*uncache_tagp)[2] = 0;
}

void nkPathReset() {
draw_id = !draw_id;
p1_ot = p1_ot_buff[draw_id];
p1_packet_top = p1_packet_buff[draw_id];
p1_packet = (qword *)((u32)p1_packet_top | 0x20000000);
p1_packet_cnt = p1_packet;
nkClearOT(p1_ot, 4, -1);
}

void nkP1Flush(qword *otp) {
(*p1_packet)[0] = (*otp)[0];
(*p1_packet)[1] = (*otp)[1];
(*p1_packet)[2] = (*p1_packet)[3] = 0;
(*otp)[0] = 0x20000000;
(*otp)[1] = (u32)p1_packet_cnt & 0xDFFFFFFF;
p1_packet++;
p1_packet_cnt = p1_packet;
}

void nkDebFlush() {
nkP1Flush(&p1_ot[4]);
}

void nkDmaSendVif1(qword *addr) {
sceDmaSync(DmaChVIF1, 0, 0);
sceDmaSend(DmaChVIF1, addr);
}

void nkDmaSendVif0(qword *addr) {
sceDmaSync(DmaChVIF0, 0, 0);
sceDmaSend(DmaChVIF0, addr);
}

void nkPathFlush() {
FlushCache(WRITEBACK_DCACHE);
nkDmaSendVif1(p1_ot);
}

void nkPathBlock() {
DisableDmac(DMAC_VIF1);
}

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