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/*
* AVR emulator
*
* Copyright (C) 2007 Michael Buesch <mb@bu3sch.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "memory.h"
#include "util.h"
#include "cpu.h"
#include "hardware.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
/* The memory (SRAM and MMIO). */
struct avr_memory memory;
int register_io_write_handler(io_write_handler_t handler, enum avr_io_port virt)
{
uint16_t phys;
if (virt >= NR_VIRT_IO_PORTS)
goto unavailable;
phys = io_virt_to_phys(virt);
if (phys == IO_PORT_UNAVAILABLE)
goto unavailable;
phys -= IO_MEM_OFFSET;
if (memory.io_write_handlers[phys])
goto busy;
memory.io_write_handlers[phys] = handler;
return 0;
unavailable:
fprintf(stderr, "IO-write: Tried to register handler for unavailable IO port\n");
return -EEXIST;
busy:
fprintf(stderr, "IO-write: Tried to register an IO handler twice\n");
return -EALREADY;
}
int register_io_read_handler(io_read_handler_t handler, enum avr_io_port virt)
{
uint16_t phys;
if (virt >= NR_VIRT_IO_PORTS)
goto unavailable;
phys = io_virt_to_phys(virt);
if (phys == IO_PORT_UNAVAILABLE)
goto unavailable;
phys -= IO_MEM_OFFSET;
if (memory.io_read_handlers[phys])
goto busy;
memory.io_read_handlers[phys] = handler;
return 0;
unavailable:
fprintf(stderr, "IO-read: Tried to register handler for unavailable IO port\n");
return -EEXIST;
busy:
fprintf(stderr, "IO-read: Tried to register an IO handler twice\n");
return -EALREADY;
}
void memory_cleanup(void)
{
//TODO
}
int memory_initialize(void)
{
int err;
size_t nr_io;
memory.ram = active_setup.memory_data;
memory.size = active_setup.memory_size;
memory.io = memory.ram + IO_MEM_OFFSET;
memory.sram_offset = active_setup.sram_offset;
err = pthread_spin_init(&memory.io_lock, 0);
if (err) {
fprintf(stderr, "Failed to init the I/O spinlock\n");
return -ENOMEM;
}
memory.sp_offset = active_setup.sp_offset;
nr_io = active_setup.sram_offset - IO_MEM_OFFSET;
memory.iospace_size = nr_io;
memory.io_write_handlers = malloc(sizeof(io_write_handler_t) * nr_io);
if (!memory.io_write_handlers) {
fprintf(stderr, "Failed to alloc IO write handlers\n");
return -ENOMEM;
}
memset(memory.io_write_handlers, 0, sizeof(io_write_handler_t) * nr_io);
memory.io_read_handlers = malloc(sizeof(io_read_handler_t) * nr_io);
if (!memory.io_read_handlers) {
fprintf(stderr, "Failed to alloc IO read handlers\n");
return -ENOMEM;
}
memset(memory.io_read_handlers, 0, sizeof(io_read_handler_t) * nr_io);
active_setup.io_setup(&memory);
return 0;
}
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