124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/*
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* QEMU NVRAM emulation for DS1225Y chip
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*
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* Copyright (c) 2007 Hervé Poussineau
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "hw.h"
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#include "mips.h"
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#include "nvram.h"
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typedef enum
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{
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none = 0,
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readmode,
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writemode,
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} nvram_open_mode;
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struct ds1225y_t
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{
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target_phys_addr_t mem_base;
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uint32_t capacity;
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const char *filename;
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QEMUFile *file;
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nvram_open_mode open_mode;
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};
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static int ds1225y_set_to_mode(ds1225y_t *NVRAM, nvram_open_mode mode, const char *filemode)
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{
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if (NVRAM->open_mode != mode)
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{
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if (NVRAM->file)
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qemu_fclose(NVRAM->file);
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NVRAM->file = qemu_fopen(NVRAM->filename, filemode);
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NVRAM->open_mode = mode;
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}
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return (NVRAM->file != NULL);
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}
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static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
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{
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ds1225y_t *NVRAM = opaque;
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int64_t pos;
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pos = addr - NVRAM->mem_base;
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if (addr >= NVRAM->capacity)
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addr -= NVRAM->capacity;
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if (!ds1225y_set_to_mode(NVRAM, readmode, "rb"))
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return 0;
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qemu_fseek(NVRAM->file, pos, SEEK_SET);
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return (uint32_t)qemu_get_byte(NVRAM->file);
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}
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static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
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{
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ds1225y_t *NVRAM = opaque;
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int64_t pos;
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pos = addr - NVRAM->mem_base;
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if (ds1225y_set_to_mode(NVRAM, writemode, "wb"))
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{
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qemu_fseek(NVRAM->file, pos, SEEK_SET);
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qemu_put_byte(NVRAM->file, (int)value);
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}
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}
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static CPUReadMemoryFunc *nvram_read[] = {
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&nvram_readb,
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NULL,
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NULL,
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};
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static CPUWriteMemoryFunc *nvram_write[] = {
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&nvram_writeb,
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NULL,
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NULL,
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};
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static CPUWriteMemoryFunc *nvram_none[] = {
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NULL,
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NULL,
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NULL,
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};
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/* Initialisation routine */
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ds1225y_t *ds1225y_init(target_phys_addr_t mem_base, const char *filename)
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{
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ds1225y_t *s;
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int mem_index1, mem_index2;
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s = qemu_mallocz(sizeof(ds1225y_t));
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if (!s)
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return NULL;
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s->mem_base = mem_base;
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s->capacity = 0x2000; /* Fixed for ds1225y chip: 8K */
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s->filename = filename;
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/* Read/write memory */
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mem_index1 = cpu_register_io_memory(0, nvram_read, nvram_write, s);
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cpu_register_physical_memory(mem_base, s->capacity, mem_index1);
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/* Read-only memory */
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mem_index2 = cpu_register_io_memory(0, nvram_read, nvram_none, s);
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cpu_register_physical_memory(mem_base + s->capacity, s->capacity, mem_index2);
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return s;
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}
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