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runs code in 1M wram, cell arrange, decode (untested)

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@54 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2007-02-21 22:23:37 +00:00
parent 3a81ecde1c
commit fa1e5e2948
16 changed files with 787 additions and 551 deletions
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38
Pico/cd/Misc.c
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@ -16,3 +16,41 @@ unsigned char formatted_bram[4*0x10] =
};
// offs | 2Mbit | 1Mbit |
// 0 | [ 2M | unused |
// 128K | bit ] | bank0 |
// 256K | unused | bank1 |
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;
}
}