a_dinosaur/ZSNES
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Memory init code ported to C (thanks kode54). SPC RAM hopefully should now be initilized correctly (thanks Overload).

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This commit is contained in:
n-a-c-h
2003-10-31 13:34:14 +00:00
parent 31f37b2530
commit da0a48e65a
4 changed files with 78 additions and 77 deletions
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77
zsnes/src/initc.c
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@@ -17,7 +17,7 @@ along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <string.h>
//C++ style code in C
#define bool unsigned char
@@ -352,6 +352,76 @@ void MirrorROM()
}
//Memory Setup functions
extern unsigned char wramdataa[65536];
extern unsigned char ram7fa[65536];
extern unsigned char srama[65536];
extern unsigned char debugbufa[80000];
extern unsigned char regptra[49152];
extern unsigned char regptwa[49152];
extern unsigned char vidmemch2[4096];
extern unsigned char vidmemch4[4096];
extern unsigned char vidmemch8[4096];
extern unsigned char pal16b[1024];
extern unsigned char pal16bcl[1024];
extern unsigned char pal16bclha[1024];
extern unsigned char pal16bxcl[256];
extern unsigned char spcRam[65472];
extern unsigned char *sram;
extern unsigned char *vidbuffer;
extern unsigned char *vram;
extern unsigned char *vcache2b;
extern unsigned char *vcache4b;
extern unsigned char *vcache8b;
void clearmem()
{
memset(vidbuffer, 0, 131072);
memset(wramdataa, 0, 65536);
memset(ram7fa, 0, 65536);
memset(vram, 0, 65536);
memset(srama, 0, 65536);
memset(debugbufa, 0, 80000);
memset(regptra, 0, 49152);
memset(regptwa, 0, 49152);
memset(vcache2b, 0, 262144);
memset(vcache4b, 0, 131072);
memset(vcache8b, 0, 65536);
memset(vidmemch2, 0, 4096);
memset(vidmemch4, 0, 4096);
memset(vidmemch8, 0, 4096);
memset(pal16b, 0, 1024);
memset(pal16bcl, 0, 1024);
memset(pal16bclha, 0, 1024);
memset(pal16bxcl, 0xFF, 256);
memset(romdata, 0xFF, maxromspace+32768);
}
void clearmem2()
{
/*
SPC RAM is filled with alternating 0x00 and 0xFF for 0x20 bytes.
Basically the SPCRAM is initialized as follows:
xx00 - xx1f: $00
xx20 - xx3f: $ff
xx40 - xx5f: $00
xx60 - xx7f: $ff
xx80 - xx9f: $00
xxa0 - xxbf: $ff
xxc0 - xxdf: $00
xxe0 - xxff: $ff
*/
unsigned int i;
for (i = 0; i < 65472; i += 0x40)
{
memset(spcRam+i, 0, 0x20);
memset(spcRam+i+0x20, 0xFF, 0x20);
}
memset(sram, 0xFF, 16384);
}
/*
@@ -362,8 +432,6 @@ Would be nice to trash this section in the future
*/
#include <string.h>
extern unsigned char disablehdma;
extern unsigned char Offby1line;
extern unsigned char CacheCheckSkip;
@@ -373,7 +441,6 @@ extern unsigned char hdmaearlstart;
extern unsigned int WindowDisables;
extern unsigned char ClearScreenSkip;
extern unsigned char ENVDisable;
extern unsigned char *spcRam;
extern unsigned char latchyr;
extern unsigned char cycpb268;
extern unsigned char cycpb358;
@@ -388,8 +455,6 @@ extern unsigned char opexec358cph;
extern unsigned char DSP1Type;
extern unsigned int ewj2hack;
extern unsigned char cycpl;
extern unsigned short ramsize;
extern unsigned short ramsizeand;
void headerhack()
{