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, ...)                                   \
  35     do { printf("NVR: " fmt , ## __VA_ARGS__); } while (0)
  36 #else
  37 #define NVR_DPRINTF(fmt, ...)
  38 #endif
  39
  40 struct MacIONVRAMState {
  41     target_phys_addr_t size;
  42     int mem_index;
  43     unsigned int it_shift;
  44     uint8_t *data;
  45 };
  46
  47 #define DEF_SYSTEM_SIZE 0xc10
  48
  49 /* Direct access to NVRAM */
  50 uint32_t macio_nvram_read (void *opaque, uint32_t addr)
  51 {
  52     MacIONVRAMState *s = opaque;
  53     uint32_t ret;
  54
  55     if (addr < s->size)
  56         ret = s->data[addr];
  57     else
  58         ret = -1;
  59     NVR_DPRINTF("read addr %04x val %x\n", addr, ret);
  60
  61     return ret;
  62 }
  63
  64 void macio_nvram_write (void *opaque, uint32_t addr, uint32_t val)
  65 {
  66     MacIONVRAMState *s = opaque;
  67
  68     NVR_DPRINTF("write addr %04x val %x\n", addr, val);
  69     if (addr < s->size)
  70         s->data[addr] = val;
  71 }
  72
  73 /* macio style NVRAM device */
  74 static void macio_nvram_writeb (void *opaque,
  75                                 target_phys_addr_t addr, uint32_t value)
  76 {
  77     MacIONVRAMState *s = opaque;
  78
  79     addr = (addr >> s->it_shift) & (s->size - 1);
  80     s->data[addr] = value;
  81     NVR_DPRINTF("writeb addr %04x val %x\n", (int)addr, value);
  82 }
  83
  84 static uint32_t macio_nvram_readb (void *opaque, target_phys_addr_t addr)
  85 {
  86     MacIONVRAMState *s = opaque;
  87     uint32_t value;
  88
  89     addr = (addr >> s->it_shift) & (s->size - 1);
  90     value = s->data[addr];
  91     NVR_DPRINTF("readb addr %04x val %x\n", (int)addr, value);
  92
  93     return value;
  94 }
  95
  96 static CPUWriteMemoryFunc * const nvram_write[] = {
  97     &macio_nvram_writeb,
  98     &macio_nvram_writeb,
  99     &macio_nvram_writeb,
 100 };
 101
 102 static CPUReadMemoryFunc * const nvram_read[] = {
 103     &macio_nvram_readb,
 104     &macio_nvram_readb,
 105     &macio_nvram_readb,
 106 };
 107
 108 static void macio_nvram_save(QEMUFile *f, void *opaque)
 109 {
 110     MacIONVRAMState *s = (MacIONVRAMState *)opaque;
 111
 112     qemu_put_buffer(f, s->data, s->size);
 113 }
 114
 115 static int macio_nvram_load(QEMUFile *f, void *opaque, int version_id)
 116 {
 117     MacIONVRAMState *s = (MacIONVRAMState *)opaque;
 118
 119     if (version_id != 1)
 120         return -EINVAL;
 121
 122     qemu_get_buffer(f, s->data, s->size);
 123
 124     return 0;
 125 }
 126
 127 static void macio_nvram_reset(void *opaque)
 128 {
 129 }
 130
 131 MacIONVRAMState *macio_nvram_init (int *mem_index, target_phys_addr_t size,
 132                                    unsigned int it_shift)
 133 {
 134     MacIONVRAMState *s;
 135
 136     s = qemu_mallocz(sizeof(MacIONVRAMState));
 137     s->data = qemu_mallocz(size);
 138     s->size = size;
 139     s->it_shift = it_shift;
 140
 141     s->mem_index = cpu_register_io_memory(nvram_read, nvram_write, s);
 142     *mem_index = s->mem_index;
 143     register_savevm(NULL, "macio_nvram", -1, 1, macio_nvram_save,
 144                     macio_nvram_load, s);
 145     qemu_register_reset(macio_nvram_reset, s);
 146
 147     return s;
 148 }
 149
 150 void macio_nvram_map (void *opaque, target_phys_addr_t mem_base)
 151 {
 152     MacIONVRAMState *s;
 153
 154     s = opaque;
 155     cpu_register_physical_memory(mem_base, s->size << s->it_shift,
 156                                  s->mem_index);
 157 }
 158
 159 /* Set up a system OpenBIOS NVRAM partition */
 160 void pmac_format_nvram_partition (MacIONVRAMState *nvr, int len)
 161 {
 162     unsigned int i;
 163     uint32_t start = 0, end;
 164     struct OpenBIOS_nvpart_v1 *part_header;
 165
 166     // OpenBIOS nvram variables
 167     // Variable partition
 168     part_header = (struct OpenBIOS_nvpart_v1 *)nvr->data;
 169     part_header->signature = OPENBIOS_PART_SYSTEM;
 170     pstrcpy(part_header->name, sizeof(part_header->name), "system");
 171
 172     end = start + sizeof(struct OpenBIOS_nvpart_v1);
 173     for (i = 0; i < nb_prom_envs; i++)
 174         end = OpenBIOS_set_var(nvr->data, end, prom_envs[i]);
 175
 176     // End marker
 177     nvr->data[end++] = '\0';
 178
 179     end = start + ((end - start + 15) & ~15);
 180     /* XXX: OpenBIOS is not able to grow up a partition. Leave some space for
 181        new variables. */
 182     if (end < DEF_SYSTEM_SIZE)
 183         end = DEF_SYSTEM_SIZE;
 184     OpenBIOS_finish_partition(part_header, end - start);
 185
 186     // free partition
 187     start = end;
 188     part_header = (struct OpenBIOS_nvpart_v1 *)&nvr->data[start];
 189     part_header->signature = OPENBIOS_PART_FREE;
 190     pstrcpy(part_header->name, sizeof(part_header->name), "free");
 191
 192     end = len;
 193     OpenBIOS_finish_partition(part_header, end - start);
 194 }