1 /* 2 * QEMU sPAPR NVRAM emulation 3 * 4 * Copyright (C) 2012 David Gibson, IBM Corporation. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include <libfdt.h> 26 27 #include "sysemu/device_tree.h" 28 #include "hw/sysbus.h" 29 #include "hw/ppc/spapr.h" 30 #include "hw/ppc/spapr_vio.h" 31 32 typedef struct sPAPRNVRAM { 33 VIOsPAPRDevice sdev; 34 uint32_t size; 35 uint8_t *buf; 36 BlockDriverState *drive; 37 } sPAPRNVRAM; 38 39 #define MIN_NVRAM_SIZE 8192 40 #define DEFAULT_NVRAM_SIZE 65536 41 #define MAX_NVRAM_SIZE (UINT16_MAX * 16) 42 43 static void rtas_nvram_fetch(sPAPREnvironment *spapr, 44 uint32_t token, uint32_t nargs, 45 target_ulong args, 46 uint32_t nret, target_ulong rets) 47 { 48 sPAPRNVRAM *nvram = spapr->nvram; 49 hwaddr offset, buffer, len; 50 int alen; 51 void *membuf; 52 53 if ((nargs != 3) || (nret != 2)) { 54 rtas_st(rets, 0, -3); 55 return; 56 } 57 58 if (!nvram) { 59 rtas_st(rets, 0, -1); 60 rtas_st(rets, 1, 0); 61 return; 62 } 63 64 offset = rtas_ld(args, 0); 65 buffer = rtas_ld(args, 1); 66 len = rtas_ld(args, 2); 67 68 if (((offset + len) < offset) 69 || ((offset + len) > nvram->size)) { 70 rtas_st(rets, 0, -3); 71 rtas_st(rets, 1, 0); 72 return; 73 } 74 75 membuf = cpu_physical_memory_map(buffer, &len, 1); 76 if (nvram->drive) { 77 alen = bdrv_pread(nvram->drive, offset, membuf, len); 78 } else { 79 assert(nvram->buf); 80 81 memcpy(membuf, nvram->buf + offset, len); 82 alen = len; 83 } 84 cpu_physical_memory_unmap(membuf, len, 1, len); 85 86 rtas_st(rets, 0, (alen < len) ? -1 : 0); 87 rtas_st(rets, 1, (alen < 0) ? 0 : alen); 88 } 89 90 static void rtas_nvram_store(sPAPREnvironment *spapr, 91 uint32_t token, uint32_t nargs, 92 target_ulong args, 93 uint32_t nret, target_ulong rets) 94 { 95 sPAPRNVRAM *nvram = spapr->nvram; 96 hwaddr offset, buffer, len; 97 int alen; 98 void *membuf; 99 100 if ((nargs != 3) || (nret != 2)) { 101 rtas_st(rets, 0, -3); 102 return; 103 } 104 105 if (!nvram) { 106 rtas_st(rets, 0, -1); 107 return; 108 } 109 110 offset = rtas_ld(args, 0); 111 buffer = rtas_ld(args, 1); 112 len = rtas_ld(args, 2); 113 114 if (((offset + len) < offset) 115 || ((offset + len) > nvram->size)) { 116 rtas_st(rets, 0, -3); 117 return; 118 } 119 120 membuf = cpu_physical_memory_map(buffer, &len, 0); 121 if (nvram->drive) { 122 alen = bdrv_pwrite(nvram->drive, offset, membuf, len); 123 } else { 124 assert(nvram->buf); 125 126 memcpy(nvram->buf + offset, membuf, len); 127 alen = len; 128 } 129 cpu_physical_memory_unmap(membuf, len, 0, len); 130 131 rtas_st(rets, 0, (alen < len) ? -1 : 0); 132 rtas_st(rets, 1, (alen < 0) ? 0 : alen); 133 } 134 135 static int spapr_nvram_init(VIOsPAPRDevice *dev) 136 { 137 sPAPRNVRAM *nvram = (sPAPRNVRAM *)dev; 138 139 if (nvram->drive) { 140 nvram->size = bdrv_getlength(nvram->drive); 141 } else { 142 nvram->size = DEFAULT_NVRAM_SIZE; 143 nvram->buf = g_malloc0(nvram->size); 144 } 145 146 if ((nvram->size < MIN_NVRAM_SIZE) || (nvram->size > MAX_NVRAM_SIZE)) { 147 fprintf(stderr, "spapr-nvram must be between %d and %d bytes in size\n", 148 MIN_NVRAM_SIZE, MAX_NVRAM_SIZE); 149 return -1; 150 } 151 152 spapr_rtas_register("nvram-fetch", rtas_nvram_fetch); 153 spapr_rtas_register("nvram-store", rtas_nvram_store); 154 155 return 0; 156 } 157 158 static int spapr_nvram_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off) 159 { 160 sPAPRNVRAM *nvram = (sPAPRNVRAM *)dev; 161 162 return fdt_setprop_cell(fdt, node_off, "#bytes", nvram->size); 163 } 164 165 static Property spapr_nvram_properties[] = { 166 DEFINE_SPAPR_PROPERTIES(sPAPRNVRAM, sdev), 167 DEFINE_PROP_DRIVE("drive", sPAPRNVRAM, drive), 168 DEFINE_PROP_END_OF_LIST(), 169 }; 170 171 static void spapr_nvram_class_init(ObjectClass *klass, void *data) 172 { 173 DeviceClass *dc = DEVICE_CLASS(klass); 174 VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass); 175 176 k->init = spapr_nvram_init; 177 k->devnode = spapr_nvram_devnode; 178 k->dt_name = "nvram"; 179 k->dt_type = "nvram"; 180 k->dt_compatible = "qemu,spapr-nvram"; 181 dc->props = spapr_nvram_properties; 182 } 183 184 static const TypeInfo spapr_nvram_type_info = { 185 .name = "spapr-nvram", 186 .parent = TYPE_VIO_SPAPR_DEVICE, 187 .instance_size = sizeof(sPAPRNVRAM), 188 .class_init = spapr_nvram_class_init, 189 }; 190 191 static void spapr_nvram_register_types(void) 192 { 193 type_register_static(&spapr_nvram_type_info); 194 } 195 196 type_init(spapr_nvram_register_types) 197