Return to ds1225y.c CVS log

Up to [Qemu by Fabrice Bellard] / qemu / hw

Annotation of qemu/hw/ds1225y.c, revision 1.1.1.2

1.1.1.2 ! root        1: /*
        !             2:  * QEMU NVRAM emulation for DS1225Y chip
        !             3:  *
        !             4:  * Copyright (c) 2007-2008 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: //#define DEBUG_NVRAM
        !            30: 
        !            31: typedef struct ds1225y_t
        !            32: {
        !            33:     uint32_t chip_size;
        !            34:     QEMUFile *file;
        !            35:     uint8_t *contents;
        !            36:     uint8_t protection;
        !            37: } ds1225y_t;
        !            38: 
        !            39: 
        !            40: static uint32_t nvram_readb (void *opaque, target_phys_addr_t addr)
        !            41: {
        !            42:     ds1225y_t *s = opaque;
        !            43:     uint32_t val;
        !            44: 
        !            45:     val = s->contents[addr];
        !            46: 
        !            47: #ifdef DEBUG_NVRAM
        !            48:     printf("nvram: read 0x%x at " TARGET_FMT_lx "\n", val, addr);
        !            49: #endif
        !            50:     return val;
        !            51: }
        !            52: 
        !            53: static uint32_t nvram_readw (void *opaque, target_phys_addr_t addr)
        !            54: {
        !            55:     uint32_t v;
        !            56:     v = nvram_readb(opaque, addr);
        !            57:     v |= nvram_readb(opaque, addr + 1) << 8;
        !            58:     return v;
        !            59: }
        !            60: 
        !            61: static uint32_t nvram_readl (void *opaque, target_phys_addr_t addr)
        !            62: {
        !            63:     uint32_t v;
        !            64:     v = nvram_readb(opaque, addr);
        !            65:     v |= nvram_readb(opaque, addr + 1) << 8;
        !            66:     v |= nvram_readb(opaque, addr + 2) << 16;
        !            67:     v |= nvram_readb(opaque, addr + 3) << 24;
        !            68:     return v;
        !            69: }
        !            70: 
        !            71: static void nvram_writeb (void *opaque, target_phys_addr_t addr, uint32_t val)
        !            72: {
        !            73:     ds1225y_t *s = opaque;
        !            74: 
        !            75: #ifdef DEBUG_NVRAM
        !            76:     printf("nvram: write 0x%x at " TARGET_FMT_lx "\n", val, addr);
        !            77: #endif
        !            78: 
        !            79:     s->contents[addr] = val & 0xff;
        !            80:     if (s->file) {
        !            81:         qemu_fseek(s->file, addr, SEEK_SET);
        !            82:         qemu_put_byte(s->file, (int)val);
        !            83:         qemu_fflush(s->file);
        !            84:     }
        !            85: }
        !            86: 
        !            87: static void nvram_writew (void *opaque, target_phys_addr_t addr, uint32_t val)
        !            88: {
        !            89:     nvram_writeb(opaque, addr, val & 0xff);
        !            90:     nvram_writeb(opaque, addr + 1, (val >> 8) & 0xff);
        !            91: }
        !            92: 
        !            93: static void nvram_writel (void *opaque, target_phys_addr_t addr, uint32_t val)
        !            94: {
        !            95:     nvram_writeb(opaque, addr, val & 0xff);
        !            96:     nvram_writeb(opaque, addr + 1, (val >> 8) & 0xff);
        !            97:     nvram_writeb(opaque, addr + 2, (val >> 16) & 0xff);
        !            98:     nvram_writeb(opaque, addr + 3, (val >> 24) & 0xff);
        !            99: }
        !           100: 
        !           101: static void nvram_writeb_protected (void *opaque, target_phys_addr_t addr, uint32_t val)
        !           102: {
        !           103:     ds1225y_t *s = opaque;
        !           104: 
        !           105:     if (s->protection != 7) {
        !           106: #ifdef DEBUG_NVRAM
        !           107:     printf("nvram: prevent write of 0x%x at " TARGET_FMT_lx "\n", val, addr);
        !           108: #endif
        !           109:         return;
        !           110:     }
        !           111: 
        !           112:     nvram_writeb(opaque, addr, val);
        !           113: }
        !           114: 
        !           115: static void nvram_writew_protected (void *opaque, target_phys_addr_t addr, uint32_t val)
        !           116: {
        !           117:     nvram_writeb_protected(opaque, addr, val & 0xff);
        !           118:     nvram_writeb_protected(opaque, addr + 1, (val >> 8) & 0xff);
        !           119: }
        !           120: 
        !           121: static void nvram_writel_protected (void *opaque, target_phys_addr_t addr, uint32_t val)
        !           122: {
        !           123:     nvram_writeb_protected(opaque, addr, val & 0xff);
        !           124:     nvram_writeb_protected(opaque, addr + 1, (val >> 8) & 0xff);
        !           125:     nvram_writeb_protected(opaque, addr + 2, (val >> 16) & 0xff);
        !           126:     nvram_writeb_protected(opaque, addr + 3, (val >> 24) & 0xff);
        !           127: }
        !           128: 
        !           129: static CPUReadMemoryFunc *nvram_read[] = {
        !           130:     &nvram_readb,
        !           131:     &nvram_readw,
        !           132:     &nvram_readl,
        !           133: };
        !           134: 
        !           135: static CPUWriteMemoryFunc *nvram_write[] = {
        !           136:     &nvram_writeb,
        !           137:     &nvram_writew,
        !           138:     &nvram_writel,
        !           139: };
        !           140: 
        !           141: static CPUWriteMemoryFunc *nvram_write_protected[] = {
        !           142:     &nvram_writeb_protected,
        !           143:     &nvram_writew_protected,
        !           144:     &nvram_writel_protected,
        !           145: };
        !           146: 
        !           147: /* Initialisation routine */
        !           148: void *ds1225y_init(target_phys_addr_t mem_base, const char *filename)
        !           149: {
        !           150:     ds1225y_t *s;
        !           151:     int mem_indexRW, mem_indexRP;
        !           152:     QEMUFile *file;
        !           153: 
        !           154:     s = qemu_mallocz(sizeof(ds1225y_t));
        !           155:     s->chip_size = 0x2000; /* Fixed for ds1225y chip: 8 KiB */
        !           156:     s->contents = qemu_mallocz(s->chip_size);
        !           157:     s->protection = 7;
        !           158: 
        !           159:     /* Read current file */
        !           160:     file = qemu_fopen(filename, "rb");
        !           161:     if (file) {
        !           162:         /* Read nvram contents */
        !           163:         qemu_get_buffer(file, s->contents, s->chip_size);
        !           164:         qemu_fclose(file);
        !           165:     }
        !           166:     s->file = qemu_fopen(filename, "wb");
        !           167:     if (s->file) {
        !           168:         /* Write back contents, as 'wb' mode cleaned the file */
        !           169:         qemu_put_buffer(s->file, s->contents, s->chip_size);
        !           170:         qemu_fflush(s->file);
        !           171:     }
        !           172: 
        !           173:     /* Read/write memory */
        !           174:     mem_indexRW = cpu_register_io_memory(0, nvram_read, nvram_write, s);
        !           175:     cpu_register_physical_memory(mem_base, s->chip_size, mem_indexRW);
        !           176:     /* Read/write protected memory */
        !           177:     mem_indexRP = cpu_register_io_memory(0, nvram_read, nvram_write_protected, s);
        !           178:     cpu_register_physical_memory(mem_base + s->chip_size, s->chip_size, mem_indexRP);
        !           179:     return s;
        !           180: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.