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 "firmware_abi.h"
  27 #include "sysemu.h"
  28 #include "ppc_mac.h"
  29
  30 /* debug NVR */
  31 //#define DEBUG_NVR
  32
  33 #ifdef DEBUG_NVR
  34 #define NVR_DPRINTF(fmt, args...) \
  35 do { printf("NVR: " fmt , ##args); } while (0)
  36 #else
  37 #define NVR_DPRINTF(fmt, args...)
  38 #endif
  39
  40 struct MacIONVRAMState {
  41     target_phys_addr_t size;
  42     int mem_index;
  43     uint8_t data[0x2000];
  44 };
  45
  46 /* Direct access to NVRAM */
  47 uint32_t macio_nvram_read (void *opaque, uint32_t addr)
  48 {
  49     MacIONVRAMState *s = opaque;
  50     uint32_t ret;
  51
  52     if (addr < 0x2000)
  53         ret = s->data[addr];
  54     else
  55         ret = -1;
  56     NVR_DPRINTF("read addr %04x val %x\n", addr, ret);
  57
  58     return ret;
  59 }
  60
  61 void macio_nvram_write (void *opaque, uint32_t addr, uint32_t val)
  62 {
  63     MacIONVRAMState *s = opaque;
  64
  65     NVR_DPRINTF("write addr %04x val %x\n", addr, val);
  66     if (addr < 0x2000)
  67         s->data[addr] = val;
  68 }
  69
  70 /* macio style NVRAM device */
  71 static void macio_nvram_writeb (void *opaque,
  72                                 target_phys_addr_t addr, uint32_t value)
  73 {
  74     MacIONVRAMState *s = opaque;
  75
  76     addr = (addr >> 4) & 0x1fff;
  77     s->data[addr] = value;
  78     NVR_DPRINTF("writeb addr %04x val %x\n", (int)addr, value);
  79 }
  80
  81 static uint32_t macio_nvram_readb (void *opaque, target_phys_addr_t addr)
  82 {
  83     MacIONVRAMState *s = opaque;
  84     uint32_t value;
  85
  86     addr = (addr >> 4) & 0x1fff;
  87     value = s->data[addr];
  88     NVR_DPRINTF("readb addr %04x val %x\n", (int)addr, value);
  89
  90     return value;
  91 }
  92
  93 static CPUWriteMemoryFunc *nvram_write[] = {
  94     &macio_nvram_writeb,
  95     &macio_nvram_writeb,
  96     &macio_nvram_writeb,
  97 };
  98
  99 static CPUReadMemoryFunc *nvram_read[] = {
 100     &macio_nvram_readb,
 101     &macio_nvram_readb,
 102     &macio_nvram_readb,
 103 };
 104
 105 MacIONVRAMState *macio_nvram_init (int *mem_index, target_phys_addr_t size)
 106 {
 107     MacIONVRAMState *s;
 108
 109     s = qemu_mallocz(sizeof(MacIONVRAMState));
 110     if (!s)
 111         return NULL;
 112     s->size = size;
 113     s->mem_index = cpu_register_io_memory(0, nvram_read, nvram_write, s);
 114     *mem_index = s->mem_index;
 115
 116     return s;
 117 }
 118
 119 void macio_nvram_map (void *opaque, target_phys_addr_t mem_base)
 120 {
 121     MacIONVRAMState *s;
 122
 123     s = opaque;
 124     cpu_register_physical_memory(mem_base, s->size, s->mem_index);
 125 }
 126
 127 /* Set up a system OpenBIOS NVRAM partition */
 128 void pmac_format_nvram_partition (MacIONVRAMState *nvr, int len)
 129 {
 130     unsigned int i;
 131     uint32_t start = 0, end;
 132     struct OpenBIOS_nvpart_v1 *part_header;
 133
 134     // OpenBIOS nvram variables
 135     // Variable partition
 136     part_header = (struct OpenBIOS_nvpart_v1 *)nvr->data;
 137     part_header->signature = OPENBIOS_PART_SYSTEM;
 138     pstrcpy(part_header->name, sizeof(part_header->name), "system");
 139
 140     end = start + sizeof(struct OpenBIOS_nvpart_v1);
 141     for (i = 0; i < nb_prom_envs; i++)
 142         end = OpenBIOS_set_var(nvr->data, end, prom_envs[i]);
 143
 144     // End marker
 145     nvr->data[end++] = '\0';
 146
 147     end = start + ((end - start + 15) & ~15);
 148     OpenBIOS_finish_partition(part_header, end - start);
 149
 150     // free partition
 151     start = end;
 152     part_header = (struct OpenBIOS_nvpart_v1 *)&nvr->data[start];
 153     part_header->signature = OPENBIOS_PART_FREE;
 154     pstrcpy(part_header->name, sizeof(part_header->name), "free");
 155
 156     end = len;
 157     OpenBIOS_finish_partition(part_header, end - start);
 158 }