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 <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 TYPE_VIO_SPAPR_NVRAM "spapr-nvram"
  40 #define VIO_SPAPR_NVRAM(obj) \
  41      OBJECT_CHECK(sPAPRNVRAM, (obj), TYPE_VIO_SPAPR_NVRAM)
  42
  43 #define MIN_NVRAM_SIZE 8192
  44 #define DEFAULT_NVRAM_SIZE 65536
  45 #define MAX_NVRAM_SIZE (UINT16_MAX * 16)
  46
  47 static void rtas_nvram_fetch(PowerPCCPU *cpu, sPAPREnvironment *spapr,
  48                              uint32_t token, uint32_t nargs,
  49                              target_ulong args,
  50                              uint32_t nret, target_ulong rets)
  51 {
  52     sPAPRNVRAM *nvram = spapr->nvram;
  53     hwaddr offset, buffer, len;
  54     int alen;
  55     void *membuf;
  56
  57     if ((nargs != 3) || (nret != 2)) {
  58         rtas_st(rets, 0, -3);
  59         return;
  60     }
  61
  62     if (!nvram) {
  63         rtas_st(rets, 0, -1);
  64         rtas_st(rets, 1, 0);
  65         return;
  66     }
  67
  68     offset = rtas_ld(args, 0);
  69     buffer = rtas_ld(args, 1);
  70     len = rtas_ld(args, 2);
  71
  72     if (((offset + len) < offset)
  73         || ((offset + len) > nvram->size)) {
  74         rtas_st(rets, 0, -3);
  75         rtas_st(rets, 1, 0);
  76         return;
  77     }
  78
  79     membuf = cpu_physical_memory_map(buffer, &len, 1);
  80     if (nvram->drive) {
  81         alen = bdrv_pread(nvram->drive, offset, membuf, len);
  82     } else {
  83         assert(nvram->buf);
  84
  85         memcpy(membuf, nvram->buf + offset, len);
  86         alen = len;
  87     }
  88     cpu_physical_memory_unmap(membuf, len, 1, len);
  89
  90     rtas_st(rets, 0, (alen < len) ? -1 : 0);
  91     rtas_st(rets, 1, (alen < 0) ? 0 : alen);
  92 }
  93
  94 static void rtas_nvram_store(PowerPCCPU *cpu, sPAPREnvironment *spapr,
  95                              uint32_t token, uint32_t nargs,
  96                              target_ulong args,
  97                              uint32_t nret, target_ulong rets)
  98 {
  99     sPAPRNVRAM *nvram = spapr->nvram;
 100     hwaddr offset, buffer, len;
 101     int alen;
 102     void *membuf;
 103
 104     if ((nargs != 3) || (nret != 2)) {
 105         rtas_st(rets, 0, -3);
 106         return;
 107     }
 108
 109     if (!nvram) {
 110         rtas_st(rets, 0, -1);
 111         return;
 112     }
 113
 114     offset = rtas_ld(args, 0);
 115     buffer = rtas_ld(args, 1);
 116     len = rtas_ld(args, 2);
 117
 118     if (((offset + len) < offset)
 119         || ((offset + len) > nvram->size)) {
 120         rtas_st(rets, 0, -3);
 121         return;
 122     }
 123
 124     membuf = cpu_physical_memory_map(buffer, &len, 0);
 125     if (nvram->drive) {
 126         alen = bdrv_pwrite(nvram->drive, offset, membuf, len);
 127     } else {
 128         assert(nvram->buf);
 129
 130         memcpy(nvram->buf + offset, membuf, len);
 131         alen = len;
 132     }
 133     cpu_physical_memory_unmap(membuf, len, 0, len);
 134
 135     rtas_st(rets, 0, (alen < len) ? -1 : 0);
 136     rtas_st(rets, 1, (alen < 0) ? 0 : alen);
 137 }
 138
 139 static int spapr_nvram_init(VIOsPAPRDevice *dev)
 140 {
 141     sPAPRNVRAM *nvram = VIO_SPAPR_NVRAM(dev);
 142
 143     if (nvram->drive) {
 144         nvram->size = bdrv_getlength(nvram->drive);
 145     } else {
 146         nvram->size = DEFAULT_NVRAM_SIZE;
 147         nvram->buf = g_malloc0(nvram->size);
 148     }
 149
 150     if ((nvram->size < MIN_NVRAM_SIZE) || (nvram->size > MAX_NVRAM_SIZE)) {
 151         fprintf(stderr, "spapr-nvram must be between %d and %d bytes in size\n",
 152                 MIN_NVRAM_SIZE, MAX_NVRAM_SIZE);
 153         return -1;
 154     }
 155
 156     spapr_rtas_register("nvram-fetch", rtas_nvram_fetch);
 157     spapr_rtas_register("nvram-store", rtas_nvram_store);
 158
 159     return 0;
 160 }
 161
 162 static int spapr_nvram_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
 163 {
 164     sPAPRNVRAM *nvram = VIO_SPAPR_NVRAM(dev);
 165
 166     return fdt_setprop_cell(fdt, node_off, "#bytes", nvram->size);
 167 }
 168
 169 static Property spapr_nvram_properties[] = {
 170     DEFINE_SPAPR_PROPERTIES(sPAPRNVRAM, sdev),
 171     DEFINE_PROP_DRIVE("drive", sPAPRNVRAM, drive),
 172     DEFINE_PROP_END_OF_LIST(),
 173 };
 174
 175 static void spapr_nvram_class_init(ObjectClass *klass, void *data)
 176 {
 177     DeviceClass *dc = DEVICE_CLASS(klass);
 178     VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
 179
 180     k->init = spapr_nvram_init;
 181     k->devnode = spapr_nvram_devnode;
 182     k->dt_name = "nvram";
 183     k->dt_type = "nvram";
 184     k->dt_compatible = "qemu,spapr-nvram";
 185     dc->props = spapr_nvram_properties;
 186 }
 187
 188 static const TypeInfo spapr_nvram_type_info = {
 189     .name          = TYPE_VIO_SPAPR_NVRAM,
 190     .parent        = TYPE_VIO_SPAPR_DEVICE,
 191     .instance_size = sizeof(sPAPRNVRAM),
 192     .class_init    = spapr_nvram_class_init,
 193 };
 194
 195 static void spapr_nvram_register_types(void)
 196 {
 197     type_register_static(&spapr_nvram_type_info);
 198 }
 199
 200 type_init(spapr_nvram_register_types)