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uae-0.6.0

 /*
  * UAE - The Un*x Amiga Emulator
  *
  * Memory management
  *
  * (c) 1995 Bernd Schmidt
  */

#include "sysconfig.h"
#include "sysdeps.h"

#include "config.h"
#include "options.h"
#include "memory.h"
#include "custom.h"
#include "cia.h"
#include "ersatz.h"

int ersatzkickfile = 0;

int buserr;
addrbank membanks[65536];

/* Default memory access functions */

int default_check(CPTR a, ULONG b)
{
    return 0;
}

UWORD *default_xlate(CPTR a)
{
    fprintf(stderr, "Your Amiga program just did something terribly stupid\n");
    return 0;
}

/* A dummy bank that only contains zeros */

static ULONG dummy_lget(CPTR) REGPARAM;
static UWORD dummy_wget(CPTR) REGPARAM;
static UBYTE dummy_bget(CPTR) REGPARAM;
static void  dummy_lput(CPTR, ULONG) REGPARAM;
static void  dummy_wput(CPTR, UWORD) REGPARAM;
static void  dummy_bput(CPTR, UBYTE) REGPARAM;
static int   dummy_check(CPTR addr, ULONG size) REGPARAM;
static UWORD *dummy_xlate(CPTR addr) REGPARAM;

ULONG dummy_lget(CPTR addr)
{
    return 0;
}

UWORD dummy_wget(CPTR addr)
{
    return 0;
}

UBYTE dummy_bget(CPTR addr)
{
    return 0;
}

void dummy_lput(CPTR addr, ULONG l)
{
}

void dummy_wput(CPTR addr, UWORD w)
{
}

void dummy_bput(CPTR addr, UBYTE b)
{
}

int dummy_check(CPTR addr, ULONG size)
{
    return 0;
}

UWORD *dummy_xlate(CPTR addr)
{
    return NULL;
}

/* Chip memory */

UWORD chipmemory[chipmem_size/2];

static ULONG chipmem_lget(CPTR) REGPARAM;
static UWORD chipmem_wget(CPTR) REGPARAM;
static UBYTE chipmem_bget(CPTR) REGPARAM;
static void  chipmem_lput(CPTR, ULONG) REGPARAM;
static void  chipmem_wput(CPTR, UWORD) REGPARAM;
static void  chipmem_bput(CPTR, UBYTE) REGPARAM;
static int   chipmem_check(CPTR addr, ULONG size) REGPARAM;
static UWORD *chipmem_xlate(CPTR addr) REGPARAM;

ULONG chipmem_lget(CPTR addr)
{
    addr -= chipmem_start & (chipmem_size-1);
    addr &= chipmem_size-1;
    return ((ULONG)chipmemory[addr >> 1] << 16) | chipmemory[(addr >> 1)+1];
}

UWORD chipmem_wget(CPTR addr)
{
    addr -= chipmem_start & (chipmem_size-1);
    addr &= chipmem_size-1;
    return chipmemory[addr >> 1];
}

UBYTE chipmem_bget(CPTR addr)
{
    addr -= chipmem_start & (chipmem_size-1);
    addr &= chipmem_size-1;
    if (addr & 1) 
	return chipmemory[addr >> 1];
    else
	return chipmemory[addr >> 1] >> 8;
}

void chipmem_lput(CPTR addr, ULONG l)
{
    addr -= chipmem_start & (chipmem_size-1);
    addr &= chipmem_size-1;
    chipmemory[addr >> 1] = l >> 16;
    chipmemory[(addr >> 1)+1] = (UWORD)l;
}

void chipmem_wput(CPTR addr, UWORD w)
{
    addr -= chipmem_start & (chipmem_size-1);
    addr &= chipmem_size-1;
    chipmemory[addr >> 1] = w;
}

void chipmem_bput(CPTR addr, UBYTE b)
{
    addr -= chipmem_start & (chipmem_size-1);
    addr &= chipmem_size-1;
    if (!(addr & 1)) {
	chipmemory[addr>>1] = (chipmemory[addr>>1] & 0xff) | (((UWORD)b) << 8);
    } else {
	chipmemory[addr>>1] = (chipmemory[addr>>1] & 0xff00) | b;
    }
}

int chipmem_check(CPTR addr, ULONG size)
{
    addr -= chipmem_start & (chipmem_size-1);
    addr &= chipmem_size-1;
    return (addr + size) < chipmem_size;
}

UWORD *chipmem_xlate(CPTR addr)
{
    addr -= chipmem_start & (chipmem_size-1);
    addr &= chipmem_size-1;
    return chipmemory + (addr >> 1);
}

/* Slow memory */

static UWORD *bogomemory;

static ULONG bogomem_lget(CPTR) REGPARAM;
static UWORD bogomem_wget(CPTR) REGPARAM;
static UBYTE bogomem_bget(CPTR) REGPARAM;
static void  bogomem_lput(CPTR, ULONG) REGPARAM;
static void  bogomem_wput(CPTR, UWORD) REGPARAM;
static void  bogomem_bput(CPTR, UBYTE) REGPARAM;
static int  bogomem_check(CPTR addr, ULONG size) REGPARAM;
static UWORD *bogomem_xlate(CPTR addr) REGPARAM;

ULONG bogomem_lget(CPTR addr)
{
    addr -= bogomem_start & (bogomem_size-1);
    addr &= bogomem_size-1;
    return ((ULONG)bogomemory[addr >> 1] << 16) | bogomemory[(addr >> 1)+1];
}

UWORD bogomem_wget(CPTR addr)
{
    addr -= bogomem_start & (bogomem_size-1);
    addr &= bogomem_size-1;
    return bogomemory[addr >> 1];
}

UBYTE bogomem_bget(CPTR addr)
{
    addr -= bogomem_start & (bogomem_size-1);
    addr &= bogomem_size-1;
    if (addr & 1)
	return bogomemory[addr >> 1];
    else
	return bogomemory[addr >> 1] >> 8;
}

void bogomem_lput(CPTR addr, ULONG l)
{
    addr -= bogomem_start & (bogomem_size-1);
    addr &= bogomem_size-1;
    bogomemory[addr >> 1] = l >> 16;
    bogomemory[(addr >> 1)+1] = (UWORD)l;
}

void bogomem_wput(CPTR addr, UWORD w)
{
    addr -= bogomem_start & (bogomem_size-1);
    addr &= bogomem_size-1;
    bogomemory[addr >> 1] = w;
}

void bogomem_bput(CPTR addr, UBYTE b)
{
    addr -= bogomem_start & (bogomem_size-1);
    addr &= bogomem_size-1;
    if (!(addr & 1)) {
	bogomemory[addr>>1] = (bogomemory[addr>>1] & 0xff) | (((UWORD)b) << 8);
    } else {
	bogomemory[addr>>1] = (bogomemory[addr>>1] & 0xff00) | b;
    }
}

int bogomem_check(CPTR addr, ULONG size)
{
    addr -= bogomem_start & (bogomem_size-1);
    addr &= bogomem_size-1;
    return (addr + size) < bogomem_size;
}

UWORD *bogomem_xlate(CPTR addr)
{
    addr -= bogomem_start & (bogomem_size-1);
    addr &= bogomem_size-1;
    return bogomemory + (addr >> 1);
}

/* Kick memory */

static int zkickfile = 0;
static UWORD kickmemory[kickmem_size/2];

static ULONG kickmem_lget(CPTR) REGPARAM;
static UWORD kickmem_wget(CPTR) REGPARAM;
static UBYTE kickmem_bget(CPTR) REGPARAM;
static void  kickmem_lput(CPTR, ULONG) REGPARAM;
static void  kickmem_wput(CPTR, UWORD) REGPARAM;
static void  kickmem_bput(CPTR, UBYTE) REGPARAM;
static int  kickmem_check(CPTR addr, ULONG size) REGPARAM;
static UWORD *kickmem_xlate(CPTR addr) REGPARAM;

ULONG kickmem_lget(CPTR addr)
{
    addr -= kickmem_start & (kickmem_size-1);
    addr &= kickmem_size-1;
    return ((ULONG)kickmemory[addr >> 1] << 16) | kickmemory[(addr >> 1)+1];
}

UWORD kickmem_wget(CPTR addr)
{
    addr -= kickmem_start & (kickmem_size-1);
    addr &= kickmem_size-1;
    return kickmemory[addr >> 1];
}

UBYTE kickmem_bget(CPTR addr)
{
    addr -= kickmem_start & (kickmem_size-1);
    addr &= kickmem_size-1;
    return kickmemory[addr >> 1] >> (addr & 1 ? 0 : 8);
}

void kickmem_lput(CPTR a, ULONG b)
{
}

void kickmem_wput(CPTR a, UWORD b)
{
}

void kickmem_bput(CPTR a, UBYTE b)
{
}

int kickmem_check(CPTR addr, ULONG size)
{
    addr -= kickmem_start & (kickmem_size-1);
    addr &= kickmem_size-1;
    return (addr + size) < kickmem_size;
}

UWORD *kickmem_xlate(CPTR addr)
{
    addr -= kickmem_start & (kickmem_size-1);
    addr &= kickmem_size-1;
    return kickmemory + (addr >> 1);
}

static int load_kickstart(void)
{
    int i;
    ULONG cksum = 0, prevck = 0;
    unsigned char buffer[8];
    
    FILE *f = fopen(romfile, "rb");
    
    if (f == NULL) {	
    	fprintf(stderr, "No Kickstart ROM found.\n");
	return 0;
    }
    
    fread(buffer, 1, 8, f);
    if (buffer[4] == 0 && buffer[5] == 8 && buffer[6] == 0 && buffer[7] == 0) {
	fprintf(stderr, "You seem to have a ZKick file there... You probably lose.\n");
	zkickfile = 1;
    } else 
	fseek(f, 0, SEEK_SET);
    
    i = fread(kickmemory, 1, kickmem_size, f);
    if (i == kickmem_size/2) {
	fprintf(stderr, "Warning: Kickstart is only 256K.\n");
	memcpy (kickmemory + kickmem_size/4, kickmemory, kickmem_size/2);
    } else if (i != kickmem_size) {
	fprintf(stderr, "Error while reading Kickstart.\n");
	return 0;
    }
    fclose (f);
    
    for (i = 0; i < kickmem_size/2; i++) {
	UWORD *p = kickmemory + i;
	UBYTE *bp = (UBYTE *)p;
	*p = (*bp << 8) | *(bp+1);
    }

    for (i = 0; i < kickmem_size/4; i++) {
	ULONG data = kickmemory[i*2]*65536 + kickmemory[i*2+1];
	cksum += data;
	if (cksum < prevck)
	    cksum++;
	prevck = cksum;
    }
    if (cksum != 0xFFFFFFFF) {
	fprintf(stderr, "Warning: Kickstart checksum incorrect. You probably have a corrupted ROM image.\n");
    }
    return 1;
}

/* Address banks */

addrbank dummy_bank = {
    dummy_lget, dummy_wget, dummy_bget,
    dummy_lput, dummy_wput, dummy_bput,
    dummy_xlate, dummy_check
};

addrbank chipmem_bank = {
    chipmem_lget, chipmem_wget, chipmem_bget,
    chipmem_lput, chipmem_wput, chipmem_bput,
    chipmem_xlate, chipmem_check
};

addrbank bogomem_bank = {
    bogomem_lget, bogomem_wget, bogomem_bget,
    bogomem_lput, bogomem_wput, bogomem_bput,
    bogomem_xlate, bogomem_check
};

addrbank kickmem_bank = {
    kickmem_lget, kickmem_wget, kickmem_bget,
    kickmem_lput, kickmem_wput, kickmem_bput,
    kickmem_xlate, kickmem_check
};

void memory_init(void)
{
    int i;
    buserr = 0;

    memset(chipmemory, 0, sizeof chipmemory);
    
    for(i = 0; i < 65536; i++)
	membanks[i] = dummy_bank;
    
    /* Map the chipmem into all of the lower 16MB */
    map_banks(chipmem_bank, 0x00, 256);
    map_banks(custom_bank, 0xC0, 0x20);
    map_banks(cia_bank, 0xA0, 32);
    map_banks(clock_bank, 0xDC, 1);
    
    if (use_slow_mem && bogomem_size > 0) {
	bogomemory = (UWORD *)malloc (bogomem_size);
    	map_banks(bogomem_bank, 0xC0, bogomem_size >> 16);
    }

    map_banks(rtarea_bank, 0xF0, 1); 
    rtarea_init ();
    if (!load_kickstart()) {
	init_ersatz_rom(kickmemory);
	ersatzkickfile = 1;
    }
    if (zkickfile)
	map_banks(kickmem_bank, 0x20, 8);
    
    map_banks(kickmem_bank, 0xF8, 8);
    if (!zkickfile)
	map_banks(expamem_bank, 0xE8, 1);
}

void map_banks(addrbank bank, int start, int size)
{
    int bnr;
    int hioffs = 0;
#if CPU_LEVEL < 2
    for (hioffs = 0; hioffs < 256; hioffs++)
#endif
	for (bnr = start; bnr < start+size; bnr++) 
	    membanks[bnr + hioffs * 256] = bank;
}

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