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Annotation of qemu/hw/ds1225y.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * QEMU NVRAM emulation for DS1225Y chip
        !             3:  * 
        !             4:  * Copyright (c) 2007 Herv� Poussineau
        !             5:  * 
        !             6:  * Permission is hereby granted, free of charge, to any person obtaining a copy
        !             7:  * of this software and associated documentation files (the "Software"), to deal
        !             8:  * in the Software without restriction, including without limitation the rights
        !             9:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
        !            10:  * copies of the Software, and to permit persons to whom the Software is
        !            11:  * furnished to do so, subject to the following conditions:
        !            12:  *
        !            13:  * The above copyright notice and this permission notice shall be included in
        !            14:  * all copies or substantial portions of the Software.
        !            15:  *
        !            16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
        !            17:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
        !            19:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
        !            20:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
        !            21:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
        !            22:  * THE SOFTWARE.
        !            23:  */
        !            24: 
        !            25: #include "hw.h"
        !            26: #include "mips.h"
        !            27: #include "nvram.h"
        !            28: 
        !            29: typedef enum
        !            30: {
        !            31:     none = 0,
        !            32:     readmode,
        !            33:     writemode,
        !            34: } nvram_open_mode;
        !            35: 
        !            36: struct ds1225y_t
        !            37: {
        !            38:     target_phys_addr_t mem_base;
        !            39:     uint32_t capacity;
        !            40:     const char *filename;
        !            41:     QEMUFile *file;
        !            42:     nvram_open_mode open_mode;
        !            43: };
        !            44: 
        !            45: static int ds1225y_set_to_mode(ds1225y_t *NVRAM, nvram_open_mode mode, const char *filemode)
        !            46: {
        !            47:     if (NVRAM->open_mode != mode)
        !            48:     {
        !            49:         if (NVRAM->file)
        !            50:             qemu_fclose(NVRAM->file);
        !            51:         NVRAM->file = qemu_fopen(NVRAM->filename, filemode);
        !            52:         NVRAM->open_mode = mode;
        !            53:     }
        !            54:     return (NVRAM->file != NULL);
        !            55: }
        !            56: 
        !            57: static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
        !            58: {
        !            59:     ds1225y_t *NVRAM = opaque;
        !            60:     int64_t pos;
        !            61: 
        !            62:     pos = addr - NVRAM->mem_base;
        !            63:     if (addr >= NVRAM->capacity)
        !            64:         addr -= NVRAM->capacity;
        !            65: 
        !            66:     if (!ds1225y_set_to_mode(NVRAM, readmode, "rb"))
        !            67:         return 0;
        !            68:     qemu_fseek(NVRAM->file, pos, SEEK_SET);
        !            69:     return (uint32_t)qemu_get_byte(NVRAM->file);
        !            70: }
        !            71: 
        !            72: static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
        !            73: {
        !            74:     ds1225y_t *NVRAM = opaque;
        !            75:     int64_t pos;
        !            76: 
        !            77:     pos = addr - NVRAM->mem_base;
        !            78:     if (ds1225y_set_to_mode(NVRAM, writemode, "wb"))
        !            79:     {
        !            80:         qemu_fseek(NVRAM->file, pos, SEEK_SET);
        !            81:         qemu_put_byte(NVRAM->file, (int)value);
        !            82:     }
        !            83: }
        !            84: 
        !            85: static CPUReadMemoryFunc *nvram_read[] = {
        !            86:     &nvram_readb,
        !            87:     NULL,
        !            88:     NULL,
        !            89: };
        !            90: 
        !            91: static CPUWriteMemoryFunc *nvram_write[] = {
        !            92:     &nvram_writeb,
        !            93:     NULL,
        !            94:     NULL,
        !            95: };
        !            96: 
        !            97: static CPUWriteMemoryFunc *nvram_none[] = {
        !            98:     NULL,
        !            99:     NULL,
        !           100:     NULL,
        !           101: };
        !           102: 
        !           103: /* Initialisation routine */
        !           104: ds1225y_t *ds1225y_init(target_phys_addr_t mem_base, const char *filename)
        !           105: {
        !           106:     ds1225y_t *s;
        !           107:     int mem_index1, mem_index2;
        !           108: 
        !           109:     s = qemu_mallocz(sizeof(ds1225y_t));
        !           110:     if (!s)
        !           111:         return NULL;
        !           112:     s->mem_base = mem_base;
        !           113:     s->capacity = 0x2000; /* Fixed for ds1225y chip: 8K */
        !           114:     s->filename = filename;
        !           115: 
        !           116:     /* Read/write memory */
        !           117:     mem_index1 = cpu_register_io_memory(0, nvram_read, nvram_write, s);
        !           118:     cpu_register_physical_memory(mem_base, s->capacity, mem_index1);
        !           119:     /* Read-only memory */
        !           120:     mem_index2 = cpu_register_io_memory(0, nvram_read, nvram_none, s);
        !           121:     cpu_register_physical_memory(mem_base + s->capacity, s->capacity, mem_index2);
        !           122:     return s;
        !           123: }

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