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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 1.19 2005/10/25 15:51:04 debug Exp $ |
* $Id: dev_ram.c,v 1.21 2006/01/01 13:17:17 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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* dev_ram_access(): |
* dev_ram_access(): |
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*/ |
*/ |
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int dev_ram_access(struct cpu *cpu, struct memory *mem, |
DEVICE_ACCESS(ram) |
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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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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 = MEM_DEFAULT, points_to_ram = 1; |
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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/* |
/* |
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* Calculate the amount that the mirror memory is offset from |
* 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 |
* the real (physical) memory. This is used in src/memory_rw.c |
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* with dyntrans accesses if MEM_EMULATED_RAM is set. |
* with dyntrans accesses if DM_EMULATED_RAM is set. |
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*/ |
*/ |
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d->offset = baseaddr - otheraddress; |
d->offset = baseaddr - otheraddress; |
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(baseaddr & (machine->arch_pagesize-1)) == 0 && |
(baseaddr & (machine->arch_pagesize-1)) == 0 && |
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(otheraddress & (machine->arch_pagesize - 1)) == 0 && |
(otheraddress & (machine->arch_pagesize - 1)) == 0 && |
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(length & (machine->arch_pagesize - 1)) == 0) |
(length & (machine->arch_pagesize - 1)) == 0) |
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flags |= MEM_DYNTRANS_OK | MEM_DYNTRANS_WRITE_OK |
flags |= DM_DYNTRANS_OK | DM_DYNTRANS_WRITE_OK |
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| MEM_EMULATED_RAM; |
| DM_EMULATED_RAM; |
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memory_device_register(machine->memory, "ram [mirror]", |
memory_device_register(machine->memory, "ram [mirror]", |
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baseaddr, length, dev_ram_access, d, flags |
baseaddr, length, dev_ram_access, d, flags |
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| MEM_READING_HAS_NO_SIDE_EFFECTS, (void *) &d->offset); |
| 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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/* Aligned memory? Then it works with dyntrans. */ |
/* Aligned memory? Then it works with dyntrans. */ |
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if ((baseaddr & (machine->arch_pagesize - 1)) == 0 && |
if ((baseaddr & (machine->arch_pagesize - 1)) == 0 && |
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(length & (machine->arch_pagesize - 1)) == 0) |
(length & (machine->arch_pagesize - 1)) == 0) |
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flags |= MEM_DYNTRANS_OK | MEM_DYNTRANS_WRITE_OK; |
flags |= DM_DYNTRANS_OK | DM_DYNTRANS_WRITE_OK; |
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memory_device_register(machine->memory, "ram", baseaddr, |
memory_device_register(machine->memory, "ram", baseaddr, |
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d->length, dev_ram_access, d, flags |
d->length, dev_ram_access, d, flags |
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| MEM_READING_HAS_NO_SIDE_EFFECTS, d->data); |
| DM_READS_HAVE_NO_SIDE_EFFECTS, d->data); |
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break; |
break; |
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default: |
default: |