more accuracy fixes

[picodrive.git] / Pico / cd / Misc.c

diff --git a/Pico/cd/Misc.c b/Pico/cd/Misc.c
index 3ea974b..8d36d63 100644 (file)
--- a/Pico/cd/Misc.c
+++ b/Pico/cd/Misc.c
@@ -1,16 +1,60 @@
+// Some misc stuff
+// (c) Copyright 2007, Grazvydas "notaz" Ignotas
 
 
-unsigned char formatted_bram[8*0x10] =
+unsigned char formatted_bram[4*0x10] =
 {
+#if 0
        0x00, 0xd4, 0x63, 0x00, 0x00, 0x03, 0x03, 0x00, 0x03, 0x03, 0x03, 0x00, 0x03, 0x00, 0x00, 0x03,
        0x00, 0x03, 0x00, 0x00, 0x00, 0x03, 0x03, 0x00, 0x53, 0xd2, 0xf5, 0x3a, 0x48, 0x50, 0x35, 0x0f,
        0x47, 0x14, 0xf5, 0x7e, 0x5c, 0xd4, 0xf3, 0x03, 0x00, 0x03, 0x12, 0x00, 0x0a, 0xff, 0xca, 0xa6,
        0xf5, 0x27, 0xed, 0x22, 0x47, 0xfa, 0x22, 0x96, 0x6c, 0xa5, 0x88, 0x14, 0x48, 0x48, 0x0a, 0xbb,
+#endif
        0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x5f, 0x00, 0x00, 0x00, 0x00, 0x40,
        0x00, 0x7d, 0x00, 0x7d, 0x00, 0x7d, 0x00, 0x7d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x53, 0x45, 0x47, 0x41, 0x5f, 0x43, 0x44, 0x5f, 0x52, 0x4f, 0x4d, 0x00, 0x01, 0x00, 0x00, 0x00,
        0x52, 0x41, 0x4d, 0x5f, 0x43, 0x41, 0x52, 0x54, 0x52, 0x49, 0x44, 0x47, 0x45, 0x5f, 0x5f, 0x5f,
-       // SEGA_CD_ROM.....RAM_CART
+       // SEGA_CD_ROM.....RAM_CARTRIDGE___
 };
 
 
+// offs | 2Mbit  | 1Mbit  |
+//   0  | [ 2M   | unused |
+// 128K |  bit ] | bank0  |
+// 256K | unused | bank1  |
+
+#ifndef _ASM_MISC_C
+void wram_2M_to_1M(unsigned char *m)
+{
+       unsigned short *m1M_b0, *m1M_b1;
+       unsigned int i, tmp, *m2M;
+
+       m2M = (unsigned int *) (m + 0x40000);
+       m1M_b0 = (unsigned short *) m2M;
+       m1M_b1 = (unsigned short *) (m + 0x60000);
+
+       for (i = 0x40000/4; i; i--)
+       {
+               tmp = *(--m2M);
+               *(--m1M_b0) = tmp;
+               *(--m1M_b1) = tmp >> 16;
+       }
+}
+
+void wram_1M_to_2M(unsigned char *m)
+{
+       unsigned short *m1M_b0, *m1M_b1;
+       unsigned int i, tmp, *m2M;
+
+       m2M = (unsigned int *) m;
+       m1M_b0 = (unsigned short *) (m + 0x20000);
+       m1M_b1 = (unsigned short *) (m + 0x40000);
+
+       for (i = 0x40000/4; i; i--)
+       {
+               tmp = *m1M_b0++ | (*m1M_b1++ << 16);
+               *m2M++ = tmp;
+       }
+}
+#endif
+