hw/mac_nvram.c

   1 /*
   2  * PowerMac NVRAM emulation
   3  *
   4  * Copyright (c) 2005-2007 Fabrice Bellard
   5  * Copyright (c) 2007 Jocelyn Mayer
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25 #include "hw.h"
  26 #include "ppc_mac.h"
  27
  28 struct MacIONVRAMState {
  29     target_phys_addr_t size;
  30     int mem_index;
  31     uint8_t data[0x2000];
  32 };
  33
  34 /* Direct access to NVRAM */
  35 uint32_t macio_nvram_read (void *opaque, uint32_t addr)
  36 {
  37     MacIONVRAMState *s = opaque;
  38     uint32_t ret;
  39
  40     //    printf("%s: %p addr %04x\n", __func__, s, addr);
  41     if (addr < 0x2000)
  42         ret = s->data[addr];
  43     else
  44         ret = -1;
  45
  46     return ret;
  47 }
  48
  49 void macio_nvram_write (void *opaque, uint32_t addr, uint32_t val)
  50 {
  51     MacIONVRAMState *s = opaque;
  52
  53     //    printf("%s: %p addr %04x val %02x\n", __func__, s, addr, val);
  54     if (addr < 0x2000)
  55         s->data[addr] = val;
  56 }
  57
  58 /* macio style NVRAM device */
  59 static void macio_nvram_writeb (void *opaque,
  60                                 target_phys_addr_t addr, uint32_t value)
  61 {
  62     MacIONVRAMState *s = opaque;
  63
  64     addr = (addr >> 4) & 0x1fff;
  65     s->data[addr] = value;
  66     //    printf("macio_nvram_writeb %04x = %02x\n", addr, value);
  67 }
  68
  69 static uint32_t macio_nvram_readb (void *opaque, target_phys_addr_t addr)
  70 {
  71     MacIONVRAMState *s = opaque;
  72     uint32_t value;
  73
  74     addr = (addr >> 4) & 0x1fff;
  75     value = s->data[addr];
  76     //    printf("macio_nvram_readb %04x = %02x\n", addr, value);
  77
  78     return value;
  79 }
  80
  81 static CPUWriteMemoryFunc *nvram_write[] = {
  82     &macio_nvram_writeb,
  83     &macio_nvram_writeb,
  84     &macio_nvram_writeb,
  85 };
  86
  87 static CPUReadMemoryFunc *nvram_read[] = {
  88     &macio_nvram_readb,
  89     &macio_nvram_readb,
  90     &macio_nvram_readb,
  91 };
  92
  93 MacIONVRAMState *macio_nvram_init (int *mem_index, target_phys_addr_t size)
  94 {
  95     MacIONVRAMState *s;
  96
  97     s = qemu_mallocz(sizeof(MacIONVRAMState));
  98     if (!s)
  99         return NULL;
 100     s->size = size;
 101     s->mem_index = cpu_register_io_memory(0, nvram_read, nvram_write, s);
 102     *mem_index = s->mem_index;
 103
 104     return s;
 105 }
 106
 107 void macio_nvram_map (void *opaque, target_phys_addr_t mem_base)
 108 {
 109     MacIONVRAMState *s;
 110
 111     s = opaque;
 112     cpu_register_physical_memory(mem_base, s->size, s->mem_index);
 113 }
 114
 115 static uint8_t nvram_chksum (const uint8_t *buf, int n)
 116 {
 117     int sum, i;
 118     sum = 0;
 119     for(i = 0; i < n; i++)
 120         sum += buf[i];
 121     return (sum & 0xff) + (sum >> 8);
 122 }
 123
 124 /* set a free Mac OS NVRAM partition */
 125 void pmac_format_nvram_partition (MacIONVRAMState *nvr, int len)
 126 {
 127     uint8_t *buf;
 128     char partition_name[12] = "wwwwwwwwwwww";
 129
 130     buf = nvr->data;
 131     buf[0] = 0x7f; /* free partition magic */
 132     buf[1] = 0; /* checksum */
 133     buf[2] = len >> 8;
 134     buf[3] = len;
 135     memcpy(buf + 4, partition_name, 12);
 136     buf[1] = nvram_chksum(buf, 16);
 137 }