From 07d8756a92bb28a94237bfc406b6da8ffca0c1ec Mon Sep 17 00:00:00 2001
From: Ryan Dwyer <ryandwyer1@gmail.com>
Date: Sat, 30 Jan 2021 10:20:56 +1000
Subject: [PATCH] Decompile __osSiRawStartDma

---
 src/lib/ultra/io/sirawdma.c | 77 ++++++++++++-------------------------
 1 file changed, 24 insertions(+), 53 deletions(-)

diff --git a/src/lib/ultra/io/sirawdma.c b/src/lib/ultra/io/sirawdma.c
index 7ca37b788..482abd510 100644
--- a/src/lib/ultra/io/sirawdma.c
+++ b/src/lib/ultra/io/sirawdma.c
@@ -1,55 +1,26 @@
 #include <libultra_internal.h>
 
-GLOBAL_ASM(
-glabel __osSiRawStartDma
-/*    4a8d0:	27bdffe8 */ 	addiu	$sp,$sp,-24
-/*    4a8d4:	afbf0014 */ 	sw	$ra,0x14($sp)
-/*    4a8d8:	afa5001c */ 	sw	$a1,0x1c($sp)
-/*    4a8dc:	3c0ea480 */ 	lui	$t6,0xa480
-/*    4a8e0:	8dcf0018 */ 	lw	$t7,0x18($t6)
-/*    4a8e4:	00803025 */ 	or	$a2,$a0,$zero
-/*    4a8e8:	24010001 */ 	addiu	$at,$zero,0x1
-/*    4a8ec:	31f80003 */ 	andi	$t8,$t7,0x3
-/*    4a8f0:	13000003 */ 	beqz	$t8,.L0004a900
-/*    4a8f4:	00000000 */ 	nop
-/*    4a8f8:	1000001c */ 	b	.L0004a96c
-/*    4a8fc:	2402ffff */ 	addiu	$v0,$zero,-1
-.L0004a900:
-/*    4a900:	14c10005 */ 	bne	$a2,$at,.L0004a918
-/*    4a904:	8fa4001c */ 	lw	$a0,0x1c($sp)
-/*    4a908:	24050040 */ 	addiu	$a1,$zero,0x40
-/*    4a90c:	0c012b60 */ 	jal	osWritebackDCache
-/*    4a910:	afa60018 */ 	sw	$a2,0x18($sp)
-/*    4a914:	8fa60018 */ 	lw	$a2,0x18($sp)
-.L0004a918:
-/*    4a918:	8fa4001c */ 	lw	$a0,0x1c($sp)
-/*    4a91c:	0c012d20 */ 	jal	osVirtualToPhysical
-/*    4a920:	afa60018 */ 	sw	$a2,0x18($sp)
-/*    4a924:	8fa60018 */ 	lw	$a2,0x18($sp)
-/*    4a928:	3c19a480 */ 	lui	$t9,0xa480
-/*    4a92c:	af220000 */ 	sw	$v0,0x0($t9)
-/*    4a930:	14c00006 */ 	bnez	$a2,.L0004a94c
-/*    4a934:	3c0a1fc0 */ 	lui	$t2,0x1fc0
-/*    4a938:	3c081fc0 */ 	lui	$t0,0x1fc0
-/*    4a93c:	350807c0 */ 	ori	$t0,$t0,0x7c0
-/*    4a940:	3c09a480 */ 	lui	$t1,0xa480
-/*    4a944:	10000004 */ 	b	.L0004a958
-/*    4a948:	ad280004 */ 	sw	$t0,0x4($t1)
-.L0004a94c:
-/*    4a94c:	354a07c0 */ 	ori	$t2,$t2,0x7c0
-/*    4a950:	3c0ba480 */ 	lui	$t3,0xa480
-/*    4a954:	ad6a0010 */ 	sw	$t2,0x10($t3)
-.L0004a958:
-/*    4a958:	14c00003 */ 	bnez	$a2,.L0004a968
-/*    4a95c:	8fa4001c */ 	lw	$a0,0x1c($sp)
-/*    4a960:	0c013920 */ 	jal	osInvalDCache
-/*    4a964:	24050040 */ 	addiu	$a1,$zero,0x40
-.L0004a968:
-/*    4a968:	00001025 */ 	or	$v0,$zero,$zero
-.L0004a96c:
-/*    4a96c:	8fbf0014 */ 	lw	$ra,0x14($sp)
-/*    4a970:	27bd0018 */ 	addiu	$sp,$sp,0x18
-/*    4a974:	03e00008 */ 	jr	$ra
-/*    4a978:	00000000 */ 	nop
-/*    4a97c:	00000000 */ 	nop
-);
+s32 __osSiRawStartDma(s32 direction, void *dramAddr)
+{
+	if (IO_READ(SI_STATUS_REG) & (SI_STATUS_DMA_BUSY | SI_STATUS_RD_BUSY)) {
+		return -1;
+	}
+
+	if (direction == OS_WRITE) {
+		osWritebackDCache(dramAddr, 64);
+	}
+
+	IO_WRITE(SI_DRAM_ADDR_REG, osVirtualToPhysical(dramAddr));
+
+	if (direction == OS_READ) {
+		IO_WRITE(SI_PIF_ADDR_RD64B_REG, 0x1fc007c0);
+	} else {
+		IO_WRITE(SI_PIF_ADDR_WR64B_REG, 0x1fc007c0);
+	}
+
+	if (direction == OS_READ) {
+		osInvalDCache(dramAddr, 64);
+	}
+
+	return 0;
+}