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/* |
/* |
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* Copyright (C) 2004-2005 Anders Gavare. All rights reserved. |
* Copyright (C) 2004-2006 Anders Gavare. All rights reserved. |
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* |
* |
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* Redistribution and use in source and binary forms, with or without |
* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
* modification, are permitted provided that the following conditions are met: |
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* SUCH DAMAGE. |
* SUCH DAMAGE. |
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* |
* |
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* |
* |
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* $Id: dev_ram.c,v 1.13 2005/02/11 09:53:48 debug Exp $ |
* $Id: dev_ram.c,v 1.22 2006/09/19 10:50:08 debug Exp $ |
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* |
* |
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* A generic RAM (memory) device. Can also be used to mirror/alias another |
* A generic RAM (memory) device. Can also be used to mirror/alias another |
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* part of RAM. |
* part of RAM. |
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*/ |
*/ |
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#include <sys/types.h> |
#include <sys/types.h> |
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#include <sys/mman.h> |
#include <sys/mman.h> |
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#include "console.h" |
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#include "cpu.h" |
#include "cpu.h" |
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#include "devices.h" |
#include "devices.h" |
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#include "machine.h" |
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#include "memory.h" |
#include "memory.h" |
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#include "misc.h" |
#include "misc.h" |
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int mode; |
int mode; |
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uint64_t otheraddress; |
uint64_t otheraddress; |
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/* If mode = DEV_RAM_MIRROR: */ |
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uint64_t offset; |
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/* If mode = DEV_RAM_RAM: */ |
/* If mode = DEV_RAM_RAM: */ |
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unsigned char *data; |
unsigned char *data; |
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uint64_t length; |
uint64_t length; |
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}; |
}; |
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/* |
DEVICE_ACCESS(ram) |
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* dev_ram_access(): |
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*/ |
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int dev_ram_access(struct cpu *cpu, struct memory *mem, |
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uint64_t relative_addr, unsigned char *data, size_t len, |
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int writeflag, void *extra) |
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{ |
{ |
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struct ram_data *d = extra; |
struct ram_data *d = extra; |
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/* |
/* |
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* dev_ram_init(): |
* dev_ram_init(): |
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* |
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* Initializes a RAM or mirror device. Things get a bit complicated because |
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* of dyntrans (i.e. mirrored memory ranges should be entered into the |
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* translation arrays just as normal memory and other devices are). |
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*/ |
*/ |
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void dev_ram_init(struct memory *mem, uint64_t baseaddr, uint64_t length, |
void dev_ram_init(struct machine *machine, uint64_t baseaddr, uint64_t length, |
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int mode, uint64_t otheraddress) |
int mode, uint64_t otheraddress) |
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{ |
{ |
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struct ram_data *d; |
struct ram_data *d; |
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int flags = DM_DEFAULT, points_to_ram = 1; |
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d = malloc(sizeof(struct ram_data)); |
d = malloc(sizeof(struct ram_data)); |
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if (d == NULL) { |
if (d == NULL) { |
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memset(d, 0, sizeof(struct ram_data)); |
memset(d, 0, sizeof(struct ram_data)); |
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if (mode & DEV_RAM_MIGHT_POINT_TO_DEVICES) { |
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mode &= ~DEV_RAM_MIGHT_POINT_TO_DEVICES; |
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points_to_ram = 0; |
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} |
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d->mode = mode; |
d->mode = mode; |
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d->otheraddress = otheraddress; |
d->otheraddress = otheraddress; |
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switch (d->mode) { |
switch (d->mode) { |
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case DEV_RAM_MIRROR: |
case DEV_RAM_MIRROR: |
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/* |
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* Calculate the amount that the mirror memory is offset from |
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* the real (physical) memory. This is used in src/memory_rw.c |
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* with dyntrans accesses if DM_EMULATED_RAM is set. |
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*/ |
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d->offset = baseaddr - otheraddress; |
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/* Aligned RAM? Then it works with dyntrans. */ |
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if (points_to_ram && |
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(baseaddr & (machine->arch_pagesize-1)) == 0 && |
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(otheraddress & (machine->arch_pagesize - 1)) == 0 && |
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(length & (machine->arch_pagesize - 1)) == 0) |
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flags |= DM_DYNTRANS_OK | DM_DYNTRANS_WRITE_OK |
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| DM_EMULATED_RAM; |
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memory_device_register(machine->memory, "ram [mirror]", |
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baseaddr, length, dev_ram_access, d, flags |
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| DM_READS_HAVE_NO_SIDE_EFFECTS, (void *) &d->offset); |
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break; |
break; |
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case DEV_RAM_RAM: |
case DEV_RAM_RAM: |
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/* |
/* |
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* Allocate zero-filled RAM using mmap(). If mmap() failed, |
* Allocate zero-filled RAM using mmap(). If mmap() failed, |
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} |
} |
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memset(d->data, 0, length); |
memset(d->data, 0, length); |
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} |
} |
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/* Aligned memory? Then it works with dyntrans. */ |
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if ((baseaddr & (machine->arch_pagesize - 1)) == 0 && |
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(length & (machine->arch_pagesize - 1)) == 0) |
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flags |= DM_DYNTRANS_OK | DM_DYNTRANS_WRITE_OK; |
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memory_device_register(machine->memory, "ram", baseaddr, |
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d->length, dev_ram_access, d, flags |
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| DM_READS_HAVE_NO_SIDE_EFFECTS, d->data); |
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break; |
break; |
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default: |
default: |
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fatal("dev_ram_access(): unknown mode %i\n", d->mode); |
fatal("dev_ram_access(): unknown mode %i\n", d->mode); |
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exit(1); |
exit(1); |
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} |
} |
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memory_device_register(mem, "ram", baseaddr, length, |
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dev_ram_access, d, MEM_DEFAULT, NULL); |
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} |
} |
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