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/block-backend.h" 28 #include "sysemu/device_tree.h" 29 #include "hw/sysbus.h" 30 #include "hw/ppc/spapr.h" 31 #include "hw/ppc/spapr_vio.h" 32 33 typedef struct sPAPRNVRAM { 34 VIOsPAPRDevice sdev; 35 uint32_t size; 36 uint8_t *buf; 37 BlockBackend *blk; 38 } sPAPRNVRAM; 39 40 #define TYPE_VIO_SPAPR_NVRAM "spapr-nvram" 41 #define VIO_SPAPR_NVRAM(obj) \ 42 OBJECT_CHECK(sPAPRNVRAM, (obj), TYPE_VIO_SPAPR_NVRAM) 43 44 #define MIN_NVRAM_SIZE 8192 45 #define DEFAULT_NVRAM_SIZE 65536 46 #define MAX_NVRAM_SIZE 1048576 47 48 static void rtas_nvram_fetch(PowerPCCPU *cpu, sPAPREnvironment *spapr, 49 uint32_t token, uint32_t nargs, 50 target_ulong args, 51 uint32_t nret, target_ulong rets) 52 { 53 sPAPRNVRAM *nvram = spapr->nvram; 54 hwaddr offset, buffer, len; 55 int alen; 56 void *membuf; 57 58 if ((nargs != 3) || (nret != 2)) { 59 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 60 return; 61 } 62 63 if (!nvram) { 64 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 65 rtas_st(rets, 1, 0); 66 return; 67 } 68 69 offset = rtas_ld(args, 0); 70 buffer = rtas_ld(args, 1); 71 len = rtas_ld(args, 2); 72 73 if (((offset + len) < offset) 74 || ((offset + len) > nvram->size)) { 75 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 76 rtas_st(rets, 1, 0); 77 return; 78 } 79 80 membuf = cpu_physical_memory_map(buffer, &len, 1); 81 if (nvram->blk) { 82 alen = blk_pread(nvram->blk, offset, membuf, len); 83 } else { 84 assert(nvram->buf); 85 86 memcpy(membuf, nvram->buf + offset, len); 87 alen = len; 88 } 89 cpu_physical_memory_unmap(membuf, len, 1, len); 90 91 rtas_st(rets, 0, (alen < len) ? RTAS_OUT_HW_ERROR : RTAS_OUT_SUCCESS); 92 rtas_st(rets, 1, (alen < 0) ? 0 : alen); 93 } 94 95 static void rtas_nvram_store(PowerPCCPU *cpu, sPAPREnvironment *spapr, 96 uint32_t token, uint32_t nargs, 97 target_ulong args, 98 uint32_t nret, target_ulong rets) 99 { 100 sPAPRNVRAM *nvram = spapr->nvram; 101 hwaddr offset, buffer, len; 102 int alen; 103 void *membuf; 104 105 if ((nargs != 3) || (nret != 2)) { 106 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 107 return; 108 } 109 110 if (!nvram) { 111 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 112 return; 113 } 114 115 offset = rtas_ld(args, 0); 116 buffer = rtas_ld(args, 1); 117 len = rtas_ld(args, 2); 118 119 if (((offset + len) < offset) 120 || ((offset + len) > nvram->size)) { 121 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 122 return; 123 } 124 125 membuf = cpu_physical_memory_map(buffer, &len, 0); 126 if (nvram->blk) { 127 alen = blk_pwrite(nvram->blk, offset, membuf, len); 128 } else { 129 assert(nvram->buf); 130 131 memcpy(nvram->buf + offset, membuf, len); 132 alen = len; 133 } 134 cpu_physical_memory_unmap(membuf, len, 0, len); 135 136 rtas_st(rets, 0, (alen < len) ? RTAS_OUT_HW_ERROR : RTAS_OUT_SUCCESS); 137 rtas_st(rets, 1, (alen < 0) ? 0 : alen); 138 } 139 140 static int spapr_nvram_init(VIOsPAPRDevice *dev) 141 { 142 sPAPRNVRAM *nvram = VIO_SPAPR_NVRAM(dev); 143 144 if (nvram->blk) { 145 nvram->size = blk_getlength(nvram->blk); 146 } else { 147 nvram->size = DEFAULT_NVRAM_SIZE; 148 nvram->buf = g_malloc0(nvram->size); 149 } 150 151 if ((nvram->size < MIN_NVRAM_SIZE) || (nvram->size > MAX_NVRAM_SIZE)) { 152 fprintf(stderr, "spapr-nvram must be between %d and %d bytes in size\n", 153 MIN_NVRAM_SIZE, MAX_NVRAM_SIZE); 154 return -1; 155 } 156 157 spapr_rtas_register(RTAS_NVRAM_FETCH, "nvram-fetch", rtas_nvram_fetch); 158 spapr_rtas_register(RTAS_NVRAM_STORE, "nvram-store", rtas_nvram_store); 159 160 return 0; 161 } 162 163 static int spapr_nvram_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off) 164 { 165 sPAPRNVRAM *nvram = VIO_SPAPR_NVRAM(dev); 166 167 return fdt_setprop_cell(fdt, node_off, "#bytes", nvram->size); 168 } 169 170 static Property spapr_nvram_properties[] = { 171 DEFINE_SPAPR_PROPERTIES(sPAPRNVRAM, sdev), 172 DEFINE_PROP_DRIVE("drive", sPAPRNVRAM, blk), 173 DEFINE_PROP_END_OF_LIST(), 174 }; 175 176 static void spapr_nvram_class_init(ObjectClass *klass, void *data) 177 { 178 DeviceClass *dc = DEVICE_CLASS(klass); 179 VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass); 180 181 k->init = spapr_nvram_init; 182 k->devnode = spapr_nvram_devnode; 183 k->dt_name = "nvram"; 184 k->dt_type = "nvram"; 185 k->dt_compatible = "qemu,spapr-nvram"; 186 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 187 dc->props = spapr_nvram_properties; 188 } 189 190 static const TypeInfo spapr_nvram_type_info = { 191 .name = TYPE_VIO_SPAPR_NVRAM, 192 .parent = TYPE_VIO_SPAPR_DEVICE, 193 .instance_size = sizeof(sPAPRNVRAM), 194 .class_init = spapr_nvram_class_init, 195 }; 196 197 static void spapr_nvram_register_types(void) 198 { 199 type_register_static(&spapr_nvram_type_info); 200 } 201 202 type_init(spapr_nvram_register_types) 203