fast dma

git-svn-id: file:///home/notaz/opt/svn/PicoDrive@35 be3aeb3a-fb24-0410-a615-afba39da0efa

Pico/Misc.c

@@ -85,7 +85,7 @@ const unsigned char hcounts_32[] = {
 0x0a,0x0b,0x0b,0x0b,0x0c,0x0c,0x0c,0x0d,
 };
 
-// vcounter values for PicoFrameSimple 
+// vcounter values for PicoFrameSimple
 const unsigned short vcounts[] = {
   0,  0,  1,  1,  2,  2,  3,  3,  4,  4,  5,  5,  6,  6,  7,  7,
   8,  8,  9,  9, 10, 11, 11, 12, 12, 13, 13, 14, 14, 15, 15, 16,
@@ -303,3 +303,27 @@ void SRAMUpdPending(unsigned int a, unsigned int d)
 
   Pico.m.sram_reg = (unsigned char) sreg;
 }
+
+
+#ifndef _ASM_MISC_C
+void memcpy16(unsigned short *dest, unsigned short *src, int count)
+{
+	while (count--)
+		*dest++ = *src++;
+}
+
+
+void memcpy32(int *dest, int *src, int count)
+{
+	while (count--)
+		*dest++ = *src++;
+}
+
+
+void memset32(int *dest, int c, int count)
+{
+	while (count--)
+		*dest++ = c;
+}
+#endif
+

Pico/PicoInt.h

@@ -289,6 +289,9 @@ unsigned int PicoVideoRead(unsigned int a);
 void SRAMWriteEEPROM(unsigned int d);
 unsigned int SRAMReadEEPROM();
 void SRAMUpdPending(unsigned int a, unsigned int d);
+void memcpy16(unsigned short *dest, unsigned short *src, int count);
+void memcpy32(int *dest, int *src, int count);
+void memset32(int *dest, int c, int count);
 
 
 #ifdef __cplusplus

Pico/VideoPort.c

@@ -139,15 +139,24 @@ static void DmaSlow(int len)
   {
     case 1: // vram
       r = Pico.vram;
-      for(; len; len--)
+      if (inc == 2 && !(a&1) && a+len*2 < 0x10000)
       {
-        d=*pd++;
-        if(a&1) d=(d<<8)|(d>>8);
-        r[a>>1] = (u16)d; // will drop the upper bits
-        // AutoIncrement
-        a=(u16)(a+inc);
-        // didn't src overlap?
-        //if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM
+        // most used DMA mode
+	memcpy16(r + (a>>1), pd, len);
+	a += len*2;
+      }
+      else
+      {
+        for(; len; len--)
+        {
+          d=*pd++;
+          if(a&1) d=(d<<8)|(d>>8);
+          r[a>>1] = (u16)d; // will drop the upper bits
+          // AutoIncrement
+          a=(u16)(a+inc);
+          // didn't src overlap?
+          //if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM
+        }
       }
       rendstatus|=0x10;
       break;

Pico/sound/mix.c

@@ -8,22 +8,6 @@
 }
 
 
-
-
-void memcpy32(int *dest, int *src, int count)
-{
-	while (count--)
-		*dest++ = *src++;
-}
-
-
-void memset32(int *dest, int c, int count)
-{
-	while (count--)
-		*dest++ = c;
-}
-
-
 void mix_32_to_16l_stereo(short *dest, int *src, int count)
 {
 	int l, r;
@@ -55,3 +39,16 @@ void mix_32_to_16_mono(short *dest, int *src, int count)
 }
 
 
+/* unimplemented... */
+void mix_16h_to_32(int *dest_buf, short *mp3_buf, int count)
+{
+}
+
+void mix_16h_to_32_s1(int *dest_buf, short *mp3_buf, int count)
+{
+}
+
+void mix_16h_to_32_s2(int *dest_buf, short *mp3_buf, int count)
+{
+}
+

Pico/sound/mix.h

@@ -1,6 +1,4 @@
 
-void memcpy32(int *dest, int *src, int count);
-void memset32(int *dest, int c, int count);
 //void mix_32_to_32(int *dest, int *src, int count);
 void mix_16h_to_32(int *dest, short *src, int count);
 void mix_16h_to_32_s1(int *dest, short *src, int count);

Pico/sound/mix.s

@@ -1,63 +1,5 @@
 @ vim:filetype=armasm
 
-.global memcpy32 @ int *dest, int *src, int count
-
-memcpy32:
-    stmfd   sp!, {r4,lr}
-
-    subs    r2, r2, #4
-    bmi     mcp32_fin
-
-mcp32_loop:
-    ldmia   r1!, {r3,r4,r12,lr}
-    subs    r2, r2, #4
-    stmia   r0!, {r3,r4,r12,lr}
-    bpl     mcp32_loop
-
-mcp32_fin:
-    tst     r2, #3
-    ldmeqfd sp!, {r4,pc}
-    tst     r2, #1
-    ldrne   r3, [r1], #4
-    strne   r3, [r0], #4
-
-mcp32_no_unal1:
-    tst     r2, #2
-    ldmneia r1!, {r3,r12}
-    ldmfd   sp!, {r4,lr}
-    stmneia r0!, {r3,r12}
-    bx      lr
-
-
-
-.global memset32 @ int *dest, int c, int count
-
-memset32:
-    stmfd   sp!, {lr}
-
-    mov     r3, r1
-    subs    r2, r2, #4
-    bmi     mst32_fin
-
-    mov     r12,r1
-    mov     lr, r1
-
-mst32_loop:
-    subs    r2, r2, #4
-    stmia   r0!, {r1,r3,r12,lr}
-    bpl     mst32_loop
-
-mst32_fin:
-    tst     r2, #1
-    strne   r1, [r0], #4
-
-    tst     r2, #2
-    stmneia r0!, {r1,r3}
-
-    ldmfd   sp!, {lr}
-    bx      lr
-
-
 
 @ this assumes src is word aligned
 .global mix_16h_to_32 @ int *dest, short *src, int count

Pico/sound/ym2612.c

@@ -112,7 +112,6 @@
 #include <math.h>
 
 #include "ym2612.h"
-#include "mix.h"
 
 #ifndef EXTERNAL_YM2612
 #include <stdlib.h>
@@ -125,6 +124,8 @@ extern YM2612 *ym2612_940;
 
 #endif
 
+void memset32(int *dest, int c, int count);
+
 
 #ifndef __GNUC__
 #pragma warning (disable:4100) // unreferenced formal parameter