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 mem_base;
  30     target_phys_addr_t size;
  31     int mem_index;
  32     uint8_t data[0x2000];
  33 };
  34
  35 /* Direct access to NVRAM */
  36 uint32_t macio_nvram_read (void *opaque, uint32_t addr)
  37 {
  38     MacIONVRAMState *s = opaque;
  39     uint32_t ret;
  40
  41     //    printf("%s: %p addr %04x\n", __func__, s, addr);
  42     if (addr < 0x2000)
  43         ret = s->data[addr];
  44     else
  45         ret = -1;
  46
  47     return ret;
  48 }
  49
  50 void macio_nvram_write (void *opaque, uint32_t addr, uint32_t val)
  51 {
  52     MacIONVRAMState *s = opaque;
  53
  54     //    printf("%s: %p addr %04x val %02x\n", __func__, s, addr, val);
  55     if (addr < 0x2000)
  56         s->data[addr] = val;
  57 }
  58
  59 /* macio style NVRAM device */
  60 static void macio_nvram_writeb (void *opaque,
  61                                 target_phys_addr_t addr, uint32_t value)
  62 {
  63     MacIONVRAMState *s = opaque;
  64
  65     addr -= s->mem_base;
  66     addr = (addr >> 4) & 0x1fff;
  67     s->data[addr] = value;
  68     //    printf("macio_nvram_writeb %04x = %02x\n", addr, value);
  69 }
  70
  71 static uint32_t macio_nvram_readb (void *opaque, target_phys_addr_t addr)
  72 {
  73     MacIONVRAMState *s = opaque;
  74     uint32_t value;
  75
  76     addr -= s->mem_base;
  77     addr = (addr >> 4) & 0x1fff;
  78     value = s->data[addr];
  79     //    printf("macio_nvram_readb %04x = %02x\n", addr, value);
  80
  81     return value;
  82 }
  83
  84 static CPUWriteMemoryFunc *nvram_write[] = {
  85     &macio_nvram_writeb,
  86     &macio_nvram_writeb,
  87     &macio_nvram_writeb,
  88 };
  89
  90 static CPUReadMemoryFunc *nvram_read[] = {
  91     &macio_nvram_readb,
  92     &macio_nvram_readb,
  93     &macio_nvram_readb,
  94 };
  95
  96 MacIONVRAMState *macio_nvram_init (int *mem_index, target_phys_addr_t size)
  97 {
  98     MacIONVRAMState *s;
  99
 100     s = qemu_mallocz(sizeof(MacIONVRAMState));
 101     if (!s)
 102         return NULL;
 103     s->size = size;
 104     s->mem_index = cpu_register_io_memory(0, nvram_read, nvram_write, s);
 105     *mem_index = s->mem_index;
 106
 107     return s;
 108 }
 109
 110 void macio_nvram_map (void *opaque, target_phys_addr_t mem_base)
 111 {
 112     MacIONVRAMState *s;
 113
 114     s = opaque;
 115     s->mem_base = mem_base;
 116     cpu_register_physical_memory(mem_base, s->size, s->mem_index);
 117 }
 118
 119 static uint8_t nvram_chksum (const uint8_t *buf, int n)
 120 {
 121     int sum, i;
 122     sum = 0;
 123     for(i = 0; i < n; i++)
 124         sum += buf[i];
 125     return (sum & 0xff) + (sum >> 8);
 126 }
 127
 128 /* set a free Mac OS NVRAM partition */
 129 void pmac_format_nvram_partition (MacIONVRAMState *nvr, int len)
 130 {
 131     uint8_t *buf;
 132     char partition_name[12] = "wwwwwwwwwwww";
 133
 134     buf = nvr->data;
 135     buf[0] = 0x7f; /* free partition magic */
 136     buf[1] = 0; /* checksum */
 137     buf[2] = len >> 8;
 138     buf[3] = len;
 139     memcpy(buf + 4, partition_name, 12);
 140     buf[1] = nvram_chksum(buf, 16);
 141 }