summaryrefslogtreecommitdiff
path: root/src/dma3_manager.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/dma3_manager.c')
-rw-r--r--src/dma3_manager.c524
1 files changed, 524 insertions, 0 deletions
diff --git a/src/dma3_manager.c b/src/dma3_manager.c
new file mode 100644
index 000000000..bb015c5cf
--- /dev/null
+++ b/src/dma3_manager.c
@@ -0,0 +1,524 @@
+#include "global.h"
+#include "dma3.h"
+
+IWRAM_DATA struct {
+ /* 0x00 */ const u8 *src;
+ /* 0x04 */ u8 *dest;
+ /* 0x08 */ u16 size;
+ /* 0x0A */ u16 mode;
+ /* 0x0C */ u32 value;
+} gDma3Requests[128];
+
+static bool8 gDma3ManagerLocked;
+static u8 gDma3RequestCursor;
+
+void ClearDma3Requests(void)
+{
+ int i;
+
+ gDma3ManagerLocked = TRUE;
+ gDma3RequestCursor = 0;
+
+ for(i = 0; i < (u8)ARRAY_COUNT(gDma3Requests); i++)
+ {
+ gDma3Requests[i].size = 0;
+ gDma3Requests[i].src = 0;
+ gDma3Requests[i].dest = 0;
+ }
+
+ gDma3ManagerLocked = FALSE;
+}
+
+#ifdef NONMATCHING
+void ProcessDma3Requests(void)
+{
+ // NOTE: the fillerA member of the DMA struct is actually u32 value;
+ u16 total_size;
+
+ if (gDma3ManagerLocked)
+ return;
+
+ total_size = 0;
+
+ // as long as there are DMA requests to process (unless size or vblank is an issue), do not exit
+ while (gDma3Requests[gDma3RequestCursor].size)
+ {
+ total_size += gDma3Requests[gDma3RequestCursor].size;
+
+ if (total_size > 0xA000)
+ return; // don't do too much at once
+
+ if (REG_VCOUNT > 224)
+ return;// we're about to leave vblank, stop
+
+ switch (gDma3Requests[gDma3RequestCursor].mode)
+ {
+ case 1: // regular 32-bit copy
+ // _08000C8C
+ if(gDma3Requests[gDma3RequestCursor].size <= 0x1000)
+ {
+ DmaCopy32(3, gDma3Requests[gDma3RequestCursor].src, gDma3Requests[gDma3RequestCursor].dest, gDma3Requests[gDma3RequestCursor].size);
+ break;
+ }
+ while (gDma3Requests[gDma3RequestCursor].size > 0x1000)
+ {
+ DmaCopy32(3, gDma3Requests[gDma3RequestCursor].src, gDma3Requests[gDma3RequestCursor].dest, 0x1000);
+ gDma3Requests[gDma3RequestCursor].src += 0x1000;
+ gDma3Requests[gDma3RequestCursor].dest += 0x1000;
+ gDma3Requests[gDma3RequestCursor].size -= 0x1000;
+ }
+ DmaCopy32(3, gDma3Requests[gDma3RequestCursor].src, gDma3Requests[gDma3RequestCursor].dest, gDma3Requests[gDma3RequestCursor].size);
+ break;
+ case 2: // repeat a single 32-bit value across RAM
+ // _08000CD0
+ while (gDma3Requests[gDma3RequestCursor].size > 0x1000)
+ {
+ DmaFill32(3, gDma3Requests[gDma3RequestCursor].value, gDma3Requests[gDma3RequestCursor].dest, 0x1000);
+ gDma3Requests[gDma3RequestCursor].dest += 0x1000;
+ gDma3Requests[gDma3RequestCursor].size -= 0x1000;
+ }
+ DmaFill32(3, gDma3Requests[gDma3RequestCursor].value, gDma3Requests[gDma3RequestCursor].dest, gDma3Requests[gDma3RequestCursor].size);
+ break;
+ case 3: // regular 16-bit copy
+ // _08000D3C
+ while (gDma3Requests[gDma3RequestCursor].size > 0x1000)
+ {
+ DmaCopy16(3, gDma3Requests[gDma3RequestCursor].src, gDma3Requests[gDma3RequestCursor].dest, 0x1000);
+ gDma3Requests[gDma3RequestCursor].src += 0x1000;
+ gDma3Requests[gDma3RequestCursor].dest += 0x1000;
+ gDma3Requests[gDma3RequestCursor].size -= 0x1000;
+ }
+ DmaCopy16(3, gDma3Requests[gDma3RequestCursor].src, gDma3Requests[gDma3RequestCursor].dest, gDma3Requests[gDma3RequestCursor].size);
+ break;
+ case 4: // repeat a single 16-bit value across RAM
+ // _08000D88
+ while (gDma3Requests[gDma3RequestCursor].size > 0x1000)
+ {
+ DmaFill16(3, gDma3Requests[gDma3RequestCursor].value, gDma3Requests[gDma3RequestCursor].dest, 0x1000);
+ gDma3Requests[gDma3RequestCursor].dest += 0x1000;
+ gDma3Requests[gDma3RequestCursor].size -= 0x1000;
+ }
+ DmaFill16(3, gDma3Requests[gDma3RequestCursor].value, gDma3Requests[gDma3RequestCursor].dest, gDma3Requests[gDma3RequestCursor].size);
+ break;
+ }
+ gDma3Requests[gDma3RequestCursor].src = NULL;
+ gDma3Requests[gDma3RequestCursor].dest = NULL;
+ gDma3Requests[gDma3RequestCursor].size = 0;
+ gDma3Requests[gDma3RequestCursor].mode = 0;
+ gDma3Requests[gDma3RequestCursor].value = 0;
+ gDma3RequestCursor++;
+
+ if (gDma3RequestCursor >= 128) // loop back to the first DMA request
+ gDma3RequestCursor = 0;
+ }
+}
+#else
+__attribute__((naked))
+void ProcessDma3Requests(void)
+{
+ asm(".syntax unified\n\
+ push {r4-r7,lr}\n\
+ mov r7, r10\n\
+ mov r6, r9\n\
+ mov r5, r8\n\
+ push {r5-r7}\n\
+ sub sp, 0xC\n\
+ ldr r0, =gDma3ManagerLocked\n\
+ ldrb r0, [r0]\n\
+ cmp r0, 0\n\
+ beq _08000C06\n\
+ b _08000E46\n\
+_08000C06:\n\
+ movs r0, 0\n\
+ str r0, [sp, 0x8]\n\
+ ldr r1, =gDma3Requests\n\
+ ldr r2, =gDma3RequestCursor\n\
+ ldrb r0, [r2]\n\
+ lsls r0, 4\n\
+ adds r0, r1\n\
+ ldrh r0, [r0, 0x8]\n\
+ mov r12, r2\n\
+ cmp r0, 0\n\
+ bne _08000C1E\n\
+ b _08000E46\n\
+_08000C1E:\n\
+ mov r8, r1\n\
+ adds r1, 0x4\n\
+ mov r10, r1\n\
+ movs r6, 0x80\n\
+ lsls r6, 5\n\
+ ldr r7, =0x040000D4 @REG_DMA3\n\
+ movs r2, 0\n\
+ mov r9, r2\n\
+_08000C2E:\n\
+ mov r3, r12 @ gDma3RequestCursor\n\
+ ldrb r0, [r3]\n\
+ lsls r5, r0, 4\n\
+ mov r0, r8 @ gDma3Requests\n\
+ adds r1, r5, r0 @ gDma3Requests[gDma3RequestCursor]\n\
+ ldrh r0, [r1, 0x8] @ gDma3Requests[gDma3RequestCursor].size\n\
+ ldr r2, [sp, 0x8]\n\
+ adds r0, r2, r0\n\
+ lsls r0, 16\n\
+ lsrs r0, 16\n\
+ str r0, [sp, 0x8]\n\
+ movs r0, 0xA0\n\
+ lsls r0, 8\n\
+ ldr r3, [sp, 0x8]\n\
+ cmp r3, r0\n\
+ bls _08000C50\n\
+ b _08000E46\n\
+_08000C50:\n\
+ ldr r0, =0x04000006 @REG_VCOUNT\n\
+ ldrb r0, [r0]\n\
+ cmp r0, 0xE0\n\
+ bls _08000C5A\n\
+ b _08000E46\n\
+_08000C5A:\n\
+ ldrh r0, [r1, 0xA]\n\
+ cmp r0, 0x2\n\
+ beq _08000CD0\n\
+ cmp r0, 0x2\n\
+ bgt _08000C80\n\
+ cmp r0, 0x1\n\
+ beq _08000C8C\n\
+ b _08000DF0\n\
+ .pool\n\
+_08000C80:\n\
+ cmp r0, 0x3\n\
+ beq _08000D3C\n\
+ cmp r0, 0x4\n\
+ bne _08000C8A\n\
+ b _08000D88\n\
+_08000C8A:\n\
+ b _08000DF0\n\
+_08000C8C:\n\
+ ldr r3, [r1]\n\
+ mov r2, r10\n\
+ adds r0, r5, r2\n\
+ ldr r2, [r0]\n\
+ ldrh r1, [r1, 0x8]\n\
+ cmp r1, r6\n\
+ bhi _08000CA6\n\
+ str r3, [r7]\n\
+ str r2, [r7, 0x4]\n\
+ lsrs r0, r1, 2\n\
+ movs r1, 0x84\n\
+ lsls r1, 24\n\
+ b _08000DAA\n\
+_08000CA6:\n\
+ ldr r4, =0x040000D4 @REG_DMA3\n\
+ str r3, [r4]\n\
+ str r2, [r4, 0x4]\n\
+ ldr r0, =0x84000400\n\
+ str r0, [r4, 0x8]\n\
+ ldr r0, [r4, 0x8]\n\
+ adds r3, r6\n\
+ adds r2, r6\n\
+ subs r1, r6\n\
+ cmp r1, r6\n\
+ bhi _08000CA6\n\
+ str r3, [r4]\n\
+ str r2, [r4, 0x4]\n\
+ lsrs r0, r1, 2\n\
+ movs r1, 0x84\n\
+ lsls r1, 24\n\
+ b _08000D76\n\
+ .pool\n\
+_08000CD0:\n\
+ mov r3, r10\n\
+ adds r0, r5, r3\n\
+ ldr r4, [r0]\n\
+ ldrh r1, [r1, 0x8]\n\
+ cmp r1, r6\n\
+ bhi _08000CF4\n\
+ mov r0, r8\n\
+ adds r0, 0xC\n\
+ adds r0, r5, r0\n\
+ ldr r0, [r0]\n\
+ str r0, [sp]\n\
+ mov r5, sp\n\
+ str r5, [r7]\n\
+ str r4, [r7, 0x4]\n\
+ lsrs r0, r1, 2\n\
+ movs r1, 0x85\n\
+ lsls r1, 24\n\
+ b _08000DAA\n\
+_08000CF4:\n\
+ mov r2, r12\n\
+ ldrb r0, [r2]\n\
+ lsls r0, 4\n\
+ mov r5, r8\n\
+ adds r5, 0xC\n\
+ adds r0, r5\n\
+ ldr r0, [r0]\n\
+ str r0, [sp]\n\
+ ldr r3, =0x040000D4 @REG_DMA3\n\
+ mov r0, sp\n\
+ str r0, [r3]\n\
+ str r4, [r3, 0x4]\n\
+ ldr r0, =0x85000400\n\
+ str r0, [r3, 0x8]\n\
+ ldr r0, [r3, 0x8]\n\
+ adds r4, r6\n\
+ subs r1, r6\n\
+ cmp r1, r6\n\
+ bhi _08000CF4\n\
+ ldrb r0, [r2]\n\
+ lsls r0, 4\n\
+ adds r0, r5\n\
+ ldr r0, [r0]\n\
+ str r0, [sp]\n\
+ mov r2, sp\n\
+ str r2, [r3]\n\
+ str r4, [r3, 0x4]\n\
+ lsrs r0, r1, 2\n\
+ movs r1, 0x85\n\
+ lsls r1, 24\n\
+ b _08000DEA\n\
+ .pool\n\
+_08000D3C:\n\
+ ldr r3, [r1]\n\
+ mov r2, r10\n\
+ adds r0, r5, r2\n\
+ ldr r2, [r0]\n\
+ ldrh r1, [r1, 0x8]\n\
+ cmp r1, r6\n\
+ bhi _08000D56\n\
+ str r3, [r7]\n\
+ str r2, [r7, 0x4]\n\
+ lsrs r0, r1, 1\n\
+ movs r1, 0x80\n\
+ lsls r1, 24\n\
+ b _08000DAA\n\
+_08000D56:\n\
+ ldr r4, =0x040000D4 @REG_DMA3\n\
+ str r3, [r4]\n\
+ str r2, [r4, 0x4]\n\
+ ldr r0, =0x80000800\n\
+ str r0, [r4, 0x8]\n\
+ ldr r0, [r4, 0x8]\n\
+ adds r3, r6\n\
+ adds r2, r6\n\
+ subs r1, r6\n\
+ cmp r1, r6\n\
+ bhi _08000D56\n\
+ str r3, [r4]\n\
+ str r2, [r4, 0x4]\n\
+ lsrs r0, r1, 1\n\
+ movs r1, 0x80\n\
+ lsls r1, 24\n\
+_08000D76:\n\
+ orrs r0, r1\n\
+ str r0, [r4, 0x8]\n\
+ ldr r0, [r4, 0x8]\n\
+ b _08000DF0\n\
+ .pool\n\
+_08000D88:\n\
+ mov r3, r10\n\
+ adds r0, r5, r3\n\
+ ldr r2, [r0]\n\
+ ldrh r4, [r1, 0x8]\n\
+ add r1, sp, 0x4\n\
+ cmp r4, r6\n\
+ bhi _08000DB2\n\
+ mov r0, r8\n\
+ adds r0, 0xC\n\
+ adds r0, r5, r0\n\
+ ldr r0, [r0]\n\
+ strh r0, [r1]\n\
+ str r1, [r7]\n\
+ str r2, [r7, 0x4]\n\
+ lsrs r0, r4, 1\n\
+ movs r1, 0x81\n\
+ lsls r1, 24\n\
+_08000DAA:\n\
+ orrs r0, r1\n\
+ str r0, [r7, 0x8]\n\
+ ldr r0, [r7, 0x8]\n\
+ b _08000DF0\n\
+_08000DB2:\n\
+ mov r5, r12\n\
+ ldrb r0, [r5]\n\
+ lsls r0, 4\n\
+ ldr r3, =gDma3Requests + 0x0C\n\
+ adds r0, r3\n\
+ ldr r0, [r0]\n\
+ strh r0, [r1]\n\
+ ldr r3, =0x040000D4 @REG_DMA3\n\
+ str r1, [r3]\n\
+ str r2, [r3, 0x4]\n\
+ ldr r0, =0x81000800\n\
+ str r0, [r3, 0x8]\n\
+ ldr r0, [r3, 0x8]\n\
+ adds r2, r6\n\
+ subs r4, r6\n\
+ cmp r4, r6\n\
+ bhi _08000DB2\n\
+ ldrb r0, [r5]\n\
+ lsls r0, 4\n\
+ ldr r5, =gDma3Requests + 0x0C\n\
+ adds r0, r5\n\
+ ldr r0, [r0]\n\
+ strh r0, [r1]\n\
+ str r1, [r3]\n\
+ str r2, [r3, 0x4]\n\
+ lsrs r0, r4, 1\n\
+ movs r1, 0x81\n\
+ lsls r1, 24\n\
+_08000DEA:\n\
+ orrs r0, r1\n\
+ str r0, [r3, 0x8]\n\
+ ldr r0, [r3, 0x8]\n\
+_08000DF0:\n\
+ ldr r1, =gDma3Requests\n\
+ mov r3, r12\n\
+ ldrb r0, [r3]\n\
+ lsls r0, 4\n\
+ adds r0, r1\n\
+ mov r2, r9\n\
+ str r2, [r0]\n\
+ ldrb r0, [r3]\n\
+ lsls r0, 4\n\
+ add r0, r10\n\
+ str r2, [r0]\n\
+ ldrb r0, [r3]\n\
+ lsls r0, 4\n\
+ adds r0, r1\n\
+ movs r4, 0\n\
+ strh r2, [r0, 0x8]\n\
+ ldrb r0, [r3]\n\
+ lsls r0, 4\n\
+ adds r0, r1\n\
+ mov r5, r9\n\
+ strh r5, [r0, 0xA]\n\
+ ldrb r0, [r3]\n\
+ lsls r0, 4\n\
+ adds r1, 0xC\n\
+ adds r0, r1\n\
+ mov r1, r9\n\
+ str r1, [r0]\n\
+ ldrb r0, [r3]\n\
+ adds r0, 0x1\n\
+ strb r0, [r3]\n\
+ lsls r0, 24\n\
+ cmp r0, 0\n\
+ bge _08000E34\n\
+ strb r4, [r3]\n\
+_08000E34:\n\
+ mov r2, r12\n\
+ ldrb r0, [r2]\n\
+ lsls r0, 4\n\
+ ldr r3, =gDma3Requests\n\
+ adds r0, r3\n\
+ ldrh r0, [r0, 0x8]\n\
+ cmp r0, 0\n\
+ beq _08000E46\n\
+ b _08000C2E\n\
+_08000E46:\n\
+ add sp, 0xC\n\
+ pop {r3-r5}\n\
+ mov r8, r3\n\
+ mov r9, r4\n\
+ mov r10, r5\n\
+ pop {r4-r7}\n\
+ pop {r0}\n\
+ bx r0\n\
+ .pool\n\
+ .syntax divided");
+}
+#endif
+
+int RequestDma3Copy(const void *src, void *dest, u16 size, u8 mode)
+{
+ int cursor;
+ int var = 0;
+
+ gDma3ManagerLocked = 1;
+
+ cursor = gDma3RequestCursor;
+ while(1)
+ {
+ if(!gDma3Requests[cursor].size) // an empty copy was found and the current cursor will be returned.
+ {
+ gDma3Requests[cursor].src = src;
+ gDma3Requests[cursor].dest = dest;
+ gDma3Requests[cursor].size = size;
+
+ if(mode == 1)
+ gDma3Requests[cursor].mode = mode;
+ else
+ gDma3Requests[cursor].mode = 3;
+
+ gDma3ManagerLocked = FALSE;
+ return (s16)cursor;
+ }
+ if(++cursor >= 0x80) // loop back to start.
+ {
+ cursor = 0;
+ }
+ if(++var >= 0x80) // max checks were made. all resulted in failure.
+ {
+ break;
+ }
+ }
+ gDma3ManagerLocked = FALSE;
+ return -1;
+}
+
+int RequestDma3Fill(s32 value, void *dest, u16 size, u8 mode)
+{
+ int cursor;
+ int var = 0;
+
+ cursor = gDma3RequestCursor;
+ gDma3ManagerLocked = 1;
+
+ while(1)
+ {
+ if(!gDma3Requests[cursor].size)
+ {
+ gDma3Requests[cursor].dest = dest;
+ gDma3Requests[cursor].size = size;
+ gDma3Requests[cursor].mode = mode;
+ gDma3Requests[cursor].value = value;
+
+ if(mode == 1)
+ gDma3Requests[cursor].mode = 2;
+ else
+ gDma3Requests[cursor].mode = 4;
+
+ gDma3ManagerLocked = FALSE;
+ return (s16)cursor;
+ }
+ if(++cursor >= 0x80) // loop back to start.
+ {
+ cursor = 0;
+ }
+ if(++var >= 0x80) // max checks were made. all resulted in failure.
+ {
+ break;
+ }
+ }
+ gDma3ManagerLocked = FALSE;
+ return -1;
+}
+
+int CheckForSpaceForDma3Request(s16 index)
+{
+ int current = 0;
+
+ if (index == -1)
+ {
+ for (; current < 0x80; current ++)
+ if (gDma3Requests[current].size)
+ return -1;
+
+ return 0;
+ }
+
+ if (gDma3Requests[index].size)
+ return -1;
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-08 15:24:54 +0000