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 26 #include "qemu/osdep.h" 27 #include "qapi/error.h" 28 #include "hw/nvram/chrp_nvram.h" 29 #include "hw/nvram/mac_nvram.h" 30 #include "hw/qdev-properties.h" 31 #include "hw/qdev-properties-system.h" 32 #include "system/block-backend.h" 33 #include "migration/vmstate.h" 34 #include "qemu/cutils.h" 35 #include "qemu/module.h" 36 #include "qemu/error-report.h" 37 #include "trace.h" 38 #include <zlib.h> /* for adler32 */ 39 40 #define DEF_SYSTEM_SIZE 0xc10 41 42 /* macio style NVRAM device */ 43 static void macio_nvram_writeb(void *opaque, hwaddr addr, 44 uint64_t value, unsigned size) 45 { 46 MacIONVRAMState *s = opaque; 47 48 addr = (addr >> s->it_shift) & (s->size - 1); 49 trace_macio_nvram_write(addr, value); 50 s->data[addr] = value; 51 if (s->blk) { 52 if (blk_pwrite(s->blk, addr, 1, &s->data[addr], 0) < 0) { 53 error_report("%s: write of NVRAM data to backing store failed", 54 blk_name(s->blk)); 55 } 56 } 57 } 58 59 static uint64_t macio_nvram_readb(void *opaque, hwaddr addr, 60 unsigned size) 61 { 62 MacIONVRAMState *s = opaque; 63 uint32_t value; 64 65 addr = (addr >> s->it_shift) & (s->size - 1); 66 value = s->data[addr]; 67 trace_macio_nvram_read(addr, value); 68 69 return value; 70 } 71 72 static const MemoryRegionOps macio_nvram_ops = { 73 .read = macio_nvram_readb, 74 .write = macio_nvram_writeb, 75 .valid.min_access_size = 1, 76 .valid.max_access_size = 4, 77 .impl.min_access_size = 1, 78 .impl.max_access_size = 1, 79 .endianness = DEVICE_BIG_ENDIAN, 80 }; 81 82 static const VMStateDescription vmstate_macio_nvram = { 83 .name = "macio_nvram", 84 .version_id = 1, 85 .minimum_version_id = 1, 86 .fields = (const VMStateField[]) { 87 VMSTATE_VBUFFER_UINT32(data, MacIONVRAMState, 0, NULL, size), 88 VMSTATE_END_OF_LIST() 89 } 90 }; 91 92 93 static void macio_nvram_reset(DeviceState *dev) 94 { 95 } 96 97 static void macio_nvram_realizefn(DeviceState *dev, Error **errp) 98 { 99 SysBusDevice *d = SYS_BUS_DEVICE(dev); 100 MacIONVRAMState *s = MACIO_NVRAM(dev); 101 102 s->data = g_malloc0(s->size); 103 104 if (s->blk) { 105 int64_t len = blk_getlength(s->blk); 106 if (len < 0) { 107 error_setg_errno(errp, -len, 108 "could not get length of nvram backing image"); 109 return; 110 } else if (len != s->size) { 111 error_setg_errno(errp, -len, 112 "invalid size nvram backing image"); 113 return; 114 } 115 if (blk_set_perm(s->blk, BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE, 116 BLK_PERM_ALL, errp) < 0) { 117 return; 118 } 119 if (blk_pread(s->blk, 0, s->size, s->data, 0) < 0) { 120 error_setg(errp, "can't read-nvram contents"); 121 return; 122 } 123 } 124 125 memory_region_init_io(&s->mem, OBJECT(s), &macio_nvram_ops, s, 126 "macio-nvram", s->size << s->it_shift); 127 sysbus_init_mmio(d, &s->mem); 128 } 129 130 static void macio_nvram_unrealizefn(DeviceState *dev) 131 { 132 MacIONVRAMState *s = MACIO_NVRAM(dev); 133 134 g_free(s->data); 135 } 136 137 static const Property macio_nvram_properties[] = { 138 DEFINE_PROP_UINT32("size", MacIONVRAMState, size, 0), 139 DEFINE_PROP_UINT32("it_shift", MacIONVRAMState, it_shift, 0), 140 DEFINE_PROP_DRIVE("drive", MacIONVRAMState, blk), 141 }; 142 143 static void macio_nvram_class_init(ObjectClass *oc, void *data) 144 { 145 DeviceClass *dc = DEVICE_CLASS(oc); 146 147 dc->realize = macio_nvram_realizefn; 148 dc->unrealize = macio_nvram_unrealizefn; 149 device_class_set_legacy_reset(dc, macio_nvram_reset); 150 dc->vmsd = &vmstate_macio_nvram; 151 device_class_set_props(dc, macio_nvram_properties); 152 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 153 } 154 155 static const TypeInfo macio_nvram_type_info = { 156 .name = TYPE_MACIO_NVRAM, 157 .parent = TYPE_SYS_BUS_DEVICE, 158 .instance_size = sizeof(MacIONVRAMState), 159 .class_init = macio_nvram_class_init, 160 }; 161 162 static void macio_nvram_register_types(void) 163 { 164 type_register_static(&macio_nvram_type_info); 165 } 166 167 /* Set up a system OpenBIOS NVRAM partition */ 168 static void pmac_format_nvram_partition_of(MacIONVRAMState *nvr, int off, 169 int len) 170 { 171 int sysp_end; 172 173 /* OpenBIOS nvram variables partition */ 174 sysp_end = chrp_nvram_create_system_partition(&nvr->data[off], 175 DEF_SYSTEM_SIZE, len) + off; 176 177 /* Free space partition */ 178 chrp_nvram_create_free_partition(&nvr->data[sysp_end], len - sysp_end); 179 } 180 181 #define OSX_NVRAM_SIGNATURE (0x5A) 182 183 /* Set up a Mac OS X NVRAM partition */ 184 static void pmac_format_nvram_partition_osx(MacIONVRAMState *nvr, int off, 185 int len) 186 { 187 uint32_t start = off; 188 ChrpNvramPartHdr *part_header; 189 unsigned char *data = &nvr->data[start]; 190 191 /* empty partition */ 192 part_header = (ChrpNvramPartHdr *)data; 193 part_header->signature = OSX_NVRAM_SIGNATURE; 194 pstrcpy(part_header->name, sizeof(part_header->name), "wwwwwwwwwwww"); 195 196 chrp_nvram_finish_partition(part_header, len); 197 198 /* Generation */ 199 stl_be_p(&data[20], 2); 200 201 /* Adler32 checksum */ 202 stl_be_p(&data[16], adler32(0, &data[20], len - 20)); 203 } 204 205 /* Set up NVRAM with OF and OSX partitions */ 206 void pmac_format_nvram_partition(MacIONVRAMState *nvr, int len) 207 { 208 /* 209 * Mac OS X expects side "B" of the flash at the second half of NVRAM, 210 * so we use half of the chip for OF and the other half for a free OSX 211 * partition. 212 */ 213 pmac_format_nvram_partition_of(nvr, 0, len / 2); 214 pmac_format_nvram_partition_osx(nvr, len / 2, len / 2); 215 } 216 type_init(macio_nvram_register_types) 217