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