hw/nvram/spapr_nvram.c

   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 "qemu/osdep.h"
  26 #include "qapi/error.h"
  27 #include "qemu-common.h"
  28 #include "cpu.h"
  29 #include <libfdt.h>
  30
  31 #include "sysemu/block-backend.h"
  32 #include "sysemu/device_tree.h"
  33 #include "hw/sysbus.h"
  34 #include "hw/ppc/spapr.h"
  35 #include "hw/ppc/spapr_vio.h"
  36
  37 typedef struct sPAPRNVRAM {
  38     VIOsPAPRDevice sdev;
  39     uint32_t size;
  40     uint8_t *buf;
  41     BlockBackend *blk;
  42 } sPAPRNVRAM;
  43
  44 #define TYPE_VIO_SPAPR_NVRAM "spapr-nvram"
  45 #define VIO_SPAPR_NVRAM(obj) \
  46      OBJECT_CHECK(sPAPRNVRAM, (obj), TYPE_VIO_SPAPR_NVRAM)
  47
  48 #define MIN_NVRAM_SIZE 8192
  49 #define DEFAULT_NVRAM_SIZE 65536
  50 #define MAX_NVRAM_SIZE 1048576
  51
  52 static void rtas_nvram_fetch(PowerPCCPU *cpu, sPAPRMachineState *spapr,
  53                              uint32_t token, uint32_t nargs,
  54                              target_ulong args,
  55                              uint32_t nret, target_ulong rets)
  56 {
  57     sPAPRNVRAM *nvram = spapr->nvram;
  58     hwaddr offset, buffer, len;
  59     void *membuf;
  60
  61     if ((nargs != 3) || (nret != 2)) {
  62         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  63         return;
  64     }
  65
  66     if (!nvram) {
  67         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
  68         rtas_st(rets, 1, 0);
  69         return;
  70     }
  71
  72     offset = rtas_ld(args, 0);
  73     buffer = rtas_ld(args, 1);
  74     len = rtas_ld(args, 2);
  75
  76     if (((offset + len) < offset)
  77         || ((offset + len) > nvram->size)) {
  78         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  79         rtas_st(rets, 1, 0);
  80         return;
  81     }
  82
  83     assert(nvram->buf);
  84
  85     membuf = cpu_physical_memory_map(buffer, &len, 1);
  86     memcpy(membuf, nvram->buf + offset, len);
  87     cpu_physical_memory_unmap(membuf, len, 1, len);
  88
  89     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  90     rtas_st(rets, 1, len);
  91 }
  92
  93 static void rtas_nvram_store(PowerPCCPU *cpu, sPAPRMachineState *spapr,
  94                              uint32_t token, uint32_t nargs,
  95                              target_ulong args,
  96                              uint32_t nret, target_ulong rets)
  97 {
  98     sPAPRNVRAM *nvram = spapr->nvram;
  99     hwaddr offset, buffer, len;
 100     int alen;
 101     void *membuf;
 102
 103     if ((nargs != 3) || (nret != 2)) {
 104         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 105         return;
 106     }
 107
 108     if (!nvram) {
 109         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 110         return;
 111     }
 112
 113     offset = rtas_ld(args, 0);
 114     buffer = rtas_ld(args, 1);
 115     len = rtas_ld(args, 2);
 116
 117     if (((offset + len) < offset)
 118         || ((offset + len) > nvram->size)) {
 119         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 120         return;
 121     }
 122
 123     membuf = cpu_physical_memory_map(buffer, &len, 0);
 124
 125     alen = len;
 126     if (nvram->blk) {
 127         alen = blk_pwrite(nvram->blk, offset, membuf, len, 0);
 128     }
 129
 130     assert(nvram->buf);
 131     memcpy(nvram->buf + offset, membuf, len);
 132
 133     cpu_physical_memory_unmap(membuf, len, 0, len);
 134
 135     rtas_st(rets, 0, (alen < len) ? RTAS_OUT_HW_ERROR : RTAS_OUT_SUCCESS);
 136     rtas_st(rets, 1, (alen < 0) ? 0 : alen);
 137 }
 138
 139 static void spapr_nvram_realize(VIOsPAPRDevice *dev, Error **errp)
 140 {
 141     sPAPRNVRAM *nvram = VIO_SPAPR_NVRAM(dev);
 142
 143     if (nvram->blk) {
 144         nvram->size = blk_getlength(nvram->blk);
 145     } else {
 146         nvram->size = DEFAULT_NVRAM_SIZE;
 147     }
 148
 149     nvram->buf = g_malloc0(nvram->size);
 150
 151     if ((nvram->size < MIN_NVRAM_SIZE) || (nvram->size > MAX_NVRAM_SIZE)) {
 152         error_setg(errp, "spapr-nvram must be between %d and %d bytes in size",
 153                    MIN_NVRAM_SIZE, MAX_NVRAM_SIZE);
 154         return;
 155     }
 156
 157     if (nvram->blk) {
 158         int alen = blk_pread(nvram->blk, 0, nvram->buf, nvram->size);
 159
 160         if (alen != nvram->size) {
 161             error_setg(errp, "can't read spapr-nvram contents");
 162             return;
 163         }
 164     }
 165
 166     spapr_rtas_register(RTAS_NVRAM_FETCH, "nvram-fetch", rtas_nvram_fetch);
 167     spapr_rtas_register(RTAS_NVRAM_STORE, "nvram-store", rtas_nvram_store);
 168 }
 169
 170 static int spapr_nvram_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
 171 {
 172     sPAPRNVRAM *nvram = VIO_SPAPR_NVRAM(dev);
 173
 174     return fdt_setprop_cell(fdt, node_off, "#bytes", nvram->size);
 175 }
 176
 177 static int spapr_nvram_pre_load(void *opaque)
 178 {
 179     sPAPRNVRAM *nvram = VIO_SPAPR_NVRAM(opaque);
 180
 181     g_free(nvram->buf);
 182     nvram->buf = NULL;
 183     nvram->size = 0;
 184
 185     return 0;
 186 }
 187
 188 static int spapr_nvram_post_load(void *opaque, int version_id)
 189 {
 190     sPAPRNVRAM *nvram = VIO_SPAPR_NVRAM(opaque);
 191
 192     if (nvram->blk) {
 193         int alen = blk_pwrite(nvram->blk, 0, nvram->buf, nvram->size, 0);
 194
 195         if (alen < 0) {
 196             return alen;
 197         }
 198         if (alen != nvram->size) {
 199             return -1;
 200         }
 201     }
 202
 203     return 0;
 204 }
 205
 206 static const VMStateDescription vmstate_spapr_nvram = {
 207     .name = "spapr_nvram",
 208     .version_id = 1,
 209     .minimum_version_id = 1,
 210     .pre_load = spapr_nvram_pre_load,
 211     .post_load = spapr_nvram_post_load,
 212     .fields = (VMStateField[]) {
 213         VMSTATE_UINT32(size, sPAPRNVRAM),
 214         VMSTATE_VBUFFER_ALLOC_UINT32(buf, sPAPRNVRAM, 1, NULL, 0, size),
 215         VMSTATE_END_OF_LIST()
 216     },
 217 };
 218
 219 static Property spapr_nvram_properties[] = {
 220     DEFINE_SPAPR_PROPERTIES(sPAPRNVRAM, sdev),
 221     DEFINE_PROP_DRIVE("drive", sPAPRNVRAM, blk),
 222     DEFINE_PROP_END_OF_LIST(),
 223 };
 224
 225 static void spapr_nvram_class_init(ObjectClass *klass, void *data)
 226 {
 227     DeviceClass *dc = DEVICE_CLASS(klass);
 228     VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
 229
 230     k->realize = spapr_nvram_realize;
 231     k->devnode = spapr_nvram_devnode;
 232     k->dt_name = "nvram";
 233     k->dt_type = "nvram";
 234     k->dt_compatible = "qemu,spapr-nvram";
 235     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 236     dc->props = spapr_nvram_properties;
 237     dc->vmsd = &vmstate_spapr_nvram;
 238 }
 239
 240 static const TypeInfo spapr_nvram_type_info = {
 241     .name          = TYPE_VIO_SPAPR_NVRAM,
 242     .parent        = TYPE_VIO_SPAPR_DEVICE,
 243     .instance_size = sizeof(sPAPRNVRAM),
 244     .class_init    = spapr_nvram_class_init,
 245 };
 246
 247 static void spapr_nvram_register_types(void)
 248 {
 249     type_register_static(&spapr_nvram_type_info);
 250 }
 251
 252 type_init(spapr_nvram_register_types)