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-rw-r--r--src/dma3_manager.c553
1 files changed, 128 insertions, 425 deletions
diff --git a/src/dma3_manager.c b/src/dma3_manager.c
index bb015c5cf..3832c3663 100644
--- a/src/dma3_manager.c
+++ b/src/dma3_manager.c
@@ -1,13 +1,24 @@
#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];
+// Maximum amount of data we will transfer in one operation
+#define MAX_DMA_BLOCK_SIZE 0x1000
+
+#define MAX_DMA_REQUESTS 128
+
+#define DMA_REQUEST_COPY32 1
+#define DMA_REQUEST_FILL32 2
+#define DMA_REQUEST_COPY16 3
+#define DMA_REQUEST_FILL16 4
+
+IWRAM_DATA struct
+{
+ const u8 *src;
+ u8 *dest;
+ u16 size;
+ u16 mode;
+ u32 value;
+} gDma3Requests[MAX_DMA_REQUESTS];
static bool8 gDma3ManagerLocked;
static u8 gDma3RequestCursor;
@@ -19,88 +30,103 @@ void ClearDma3Requests(void)
gDma3ManagerLocked = TRUE;
gDma3RequestCursor = 0;
- for(i = 0; i < (u8)ARRAY_COUNT(gDma3Requests); i++)
+ for (i = 0; i < MAX_DMA_REQUESTS; i++)
{
gDma3Requests[i].size = 0;
- gDma3Requests[i].src = 0;
- gDma3Requests[i].dest = 0;
+ gDma3Requests[i].src = NULL;
+ gDma3Requests[i].dest = NULL;
}
gDma3ManagerLocked = FALSE;
}
-#ifdef NONMATCHING
+#define Dma3CopyLarge_(src, dest, size, bit) \
+{ \
+ const void *_src = src; \
+ void *_dest = dest; \
+ u32 _size = size; \
+ while (1) \
+ { \
+ if (_size <= MAX_DMA_BLOCK_SIZE) \
+ { \
+ DmaCopy##bit(3, _src, _dest, _size); \
+ break; \
+ } \
+ DmaCopy##bit(3, _src, _dest, MAX_DMA_BLOCK_SIZE); \
+ _src += MAX_DMA_BLOCK_SIZE; \
+ _dest += MAX_DMA_BLOCK_SIZE; \
+ _size -= MAX_DMA_BLOCK_SIZE; \
+ } \
+}
+
+#define Dma3CopyLarge16_(src, dest, size) Dma3CopyLarge_(src, dest, size, 16)
+#define Dma3CopyLarge32_(src, dest, size) Dma3CopyLarge_(src, dest, size, 32)
+
+#define Dma3FillLarge_(value, dest, size, bit) \
+{ \
+ void *_dest = dest; \
+ u32 _size = size; \
+ while (1) \
+ { \
+ if (_size <= MAX_DMA_BLOCK_SIZE) \
+ { \
+ DmaFill##bit(3, value, _dest, _size); \
+ break; \
+ } \
+ DmaFill##bit(3, value, _dest, MAX_DMA_BLOCK_SIZE); \
+ _dest += MAX_DMA_BLOCK_SIZE; \
+ _size -= MAX_DMA_BLOCK_SIZE; \
+ } \
+}
+
+#define Dma3FillLarge16_(value, dest, size) Dma3FillLarge_(value, dest, size, 16)
+#define Dma3FillLarge32_(value, dest, size) Dma3FillLarge_(value, dest, size, 32)
+
+
void ProcessDma3Requests(void)
{
- // NOTE: the fillerA member of the DMA struct is actually u32 value;
- u16 total_size;
+ u16 bytesTransferred;
if (gDma3ManagerLocked)
return;
- total_size = 0;
+ bytesTransferred = 0;
// as long as there are DMA requests to process (unless size or vblank is an issue), do not exit
- while (gDma3Requests[gDma3RequestCursor].size)
+ while (gDma3Requests[gDma3RequestCursor].size != 0)
{
- total_size += gDma3Requests[gDma3RequestCursor].size;
+ bytesTransferred += 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
+ if (bytesTransferred > 40 * 1024)
+ return; // don't transfer more than 40 KiB
+ if (*(u8 *)REG_ADDR_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);
+ case DMA_REQUEST_COPY32: // regular 32-bit copy
+ Dma3CopyLarge32_(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);
+ case DMA_REQUEST_FILL32: // repeat a single 32-bit value across RAM
+ Dma3FillLarge32_(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);
+ case DMA_REQUEST_COPY16: // regular 16-bit copy
+ Dma3CopyLarge16_(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);
+ case DMA_REQUEST_FILL16: // repeat a single 16-bit value across RAM
+ Dma3FillLarge16_(gDma3Requests[gDma3RequestCursor].value,
+ gDma3Requests[gDma3RequestCursor].dest,
+ gDma3Requests[gDma3RequestCursor].size);
break;
}
+
+ // Free the request
gDma3Requests[gDma3RequestCursor].src = NULL;
gDma3Requests[gDma3RequestCursor].dest = NULL;
gDma3Requests[gDma3RequestCursor].size = 0;
@@ -108,375 +134,54 @@ void ProcessDma3Requests(void)
gDma3Requests[gDma3RequestCursor].value = 0;
gDma3RequestCursor++;
- if (gDma3RequestCursor >= 128) // loop back to the first DMA request
+ if (gDma3RequestCursor >= MAX_DMA_REQUESTS) // 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)
+s16 RequestDma3Copy(const void *src, void *dest, u16 size, u8 mode)
{
int cursor;
- int var = 0;
-
- gDma3ManagerLocked = 1;
+ int i = 0;
+ gDma3ManagerLocked = TRUE;
cursor = gDma3RequestCursor;
- while(1)
+
+ while (i < MAX_DMA_REQUESTS)
{
- if(!gDma3Requests[cursor].size) // an empty copy was found and the current cursor will be returned.
+ if (gDma3Requests[cursor].size == 0) // an empty request was found.
{
gDma3Requests[cursor].src = src;
gDma3Requests[cursor].dest = dest;
gDma3Requests[cursor].size = size;
- if(mode == 1)
- gDma3Requests[cursor].mode = mode;
+ if (mode == 1)
+ gDma3Requests[cursor].mode = DMA_REQUEST_COPY32;
else
- gDma3Requests[cursor].mode = 3;
+ gDma3Requests[cursor].mode = DMA_REQUEST_COPY16;
gDma3ManagerLocked = FALSE;
- return (s16)cursor;
+ return cursor;
}
- if(++cursor >= 0x80) // loop back to start.
- {
+ if (++cursor >= MAX_DMA_REQUESTS) // loop back to start.
cursor = 0;
- }
- if(++var >= 0x80) // max checks were made. all resulted in failure.
- {
- break;
- }
+ i++;
}
gDma3ManagerLocked = FALSE;
- return -1;
+ return -1; // no free DMA request was found
}
-int RequestDma3Fill(s32 value, void *dest, u16 size, u8 mode)
+s16 RequestDma3Fill(s32 value, void *dest, u16 size, u8 mode)
{
int cursor;
- int var = 0;
+ int i = 0;
cursor = gDma3RequestCursor;
- gDma3ManagerLocked = 1;
+ gDma3ManagerLocked = TRUE;
- while(1)
+ while (i < MAX_DMA_REQUESTS)
{
- if(!gDma3Requests[cursor].size)
+ if (gDma3Requests[cursor].size == 0) // an empty request was found.
{
gDma3Requests[cursor].dest = dest;
gDma3Requests[cursor].size = size;
@@ -484,41 +189,39 @@ int RequestDma3Fill(s32 value, void *dest, u16 size, u8 mode)
gDma3Requests[cursor].value = value;
if(mode == 1)
- gDma3Requests[cursor].mode = 2;
+ gDma3Requests[cursor].mode = DMA_REQUEST_FILL32;
else
- gDma3Requests[cursor].mode = 4;
+ gDma3Requests[cursor].mode = DMA_REQUEST_FILL16;
gDma3ManagerLocked = FALSE;
- return (s16)cursor;
+ return cursor;
}
- if(++cursor >= 0x80) // loop back to start.
- {
+ if (++cursor >= MAX_DMA_REQUESTS) // loop back to start.
cursor = 0;
- }
- if(++var >= 0x80) // max checks were made. all resulted in failure.
- {
- break;
- }
+ i++;
}
gDma3ManagerLocked = FALSE;
- return -1;
+ return -1; // no free DMA request was found
}
int CheckForSpaceForDma3Request(s16 index)
{
- int current = 0;
+ int i = 0;
- if (index == -1)
+ if (index == -1) // check if all requests are free
{
- for (; current < 0x80; current ++)
- if (gDma3Requests[current].size)
+ while (i < MAX_DMA_REQUESTS)
+ {
+ if (gDma3Requests[i].size != 0)
return -1;
-
+ i++;
+ }
+ return 0;
+ }
+ else // check the specified request
+ {
+ if (gDma3Requests[index].size != 0)
+ return -1;
return 0;
}
-
- if (gDma3Requests[index].size)
- return -1;
-
- return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-07 09:19:40 +0000