diff options
Diffstat (limited to 'hw/spapr_nvram.c')
| -rw-r--r-- | hw/spapr_nvram.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/hw/spapr_nvram.c b/hw/spapr_nvram.c new file mode 100644 index 0000000000..512bb8d5d1 --- /dev/null +++ b/hw/spapr_nvram.c @@ -0,0 +1,196 @@ +/* + * QEMU sPAPR NVRAM emulation + * + * Copyright (C) 2012 David Gibson, IBM Corporation. + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ +#include <sys/mman.h> +#include <libfdt.h> + +#include "device_tree.h" +#include "hw/sysbus.h" +#include "hw/spapr.h" +#include "hw/spapr_vio.h" + +typedef struct sPAPRNVRAM { + VIOsPAPRDevice sdev; + uint32_t size; + uint8_t *buf; + BlockDriverState *drive; +} sPAPRNVRAM; + +#define MIN_NVRAM_SIZE 8192 +#define DEFAULT_NVRAM_SIZE 65536 +#define MAX_NVRAM_SIZE (UINT16_MAX * 16) + +static void rtas_nvram_fetch(sPAPREnvironment *spapr, + uint32_t token, uint32_t nargs, + target_ulong args, + uint32_t nret, target_ulong rets) +{ + sPAPRNVRAM *nvram = spapr->nvram; + hwaddr offset, buffer, len; + int alen; + void *membuf; + + if ((nargs != 3) || (nret != 2)) { + rtas_st(rets, 0, -3); + return; + } + + if (!nvram) { + rtas_st(rets, 0, -1); + rtas_st(rets, 1, 0); + return; + } + + offset = rtas_ld(args, 0); + buffer = rtas_ld(args, 1); + len = rtas_ld(args, 2); + + if (((offset + len) < offset) + || ((offset + len) > nvram->size)) { + rtas_st(rets, 0, -3); + rtas_st(rets, 1, 0); + return; + } + + membuf = cpu_physical_memory_map(buffer, &len, 1); + if (nvram->drive) { + alen = bdrv_pread(nvram->drive, offset, membuf, len); + } else { + assert(nvram->buf); + + memcpy(membuf, nvram->buf + offset, len); + alen = len; + } + cpu_physical_memory_unmap(membuf, len, 1, len); + + rtas_st(rets, 0, (alen < len) ? -1 : 0); + rtas_st(rets, 1, (alen < 0) ? 0 : alen); +} + +static void rtas_nvram_store(sPAPREnvironment *spapr, + uint32_t token, uint32_t nargs, + target_ulong args, + uint32_t nret, target_ulong rets) +{ + sPAPRNVRAM *nvram = spapr->nvram; + hwaddr offset, buffer, len; + int alen; + void *membuf; + + if ((nargs != 3) || (nret != 2)) { + rtas_st(rets, 0, -3); + return; + } + + if (!nvram) { + rtas_st(rets, 0, -1); + return; + } + + offset = rtas_ld(args, 0); + buffer = rtas_ld(args, 1); + len = rtas_ld(args, 2); + + if (((offset + len) < offset) + || ((offset + len) > nvram->size)) { + rtas_st(rets, 0, -3); + return; + } + + membuf = cpu_physical_memory_map(buffer, &len, 0); + if (nvram->drive) { + alen = bdrv_pwrite(nvram->drive, offset, membuf, len); + } else { + assert(nvram->buf); + + memcpy(nvram->buf + offset, membuf, len); + alen = len; + } + cpu_physical_memory_unmap(membuf, len, 0, len); + + rtas_st(rets, 0, (alen < len) ? -1 : 0); + rtas_st(rets, 1, (alen < 0) ? 0 : alen); +} + +static int spapr_nvram_init(VIOsPAPRDevice *dev) +{ + sPAPRNVRAM *nvram = (sPAPRNVRAM *)dev; + + if (nvram->drive) { + nvram->size = bdrv_getlength(nvram->drive); + } else { + nvram->size = DEFAULT_NVRAM_SIZE; + nvram->buf = g_malloc0(nvram->size); + } + + if ((nvram->size < MIN_NVRAM_SIZE) || (nvram->size > MAX_NVRAM_SIZE)) { + fprintf(stderr, "spapr-nvram must be between %d and %d bytes in size\n", + MIN_NVRAM_SIZE, MAX_NVRAM_SIZE); + return -1; + } + + spapr_rtas_register("nvram-fetch", rtas_nvram_fetch); + spapr_rtas_register("nvram-store", rtas_nvram_store); + + return 0; +} + +static int spapr_nvram_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off) +{ + sPAPRNVRAM *nvram = (sPAPRNVRAM *)dev; + + return fdt_setprop_cell(fdt, node_off, "#bytes", nvram->size); +} + +static Property spapr_nvram_properties[] = { + DEFINE_SPAPR_PROPERTIES(sPAPRNVRAM, sdev), + DEFINE_PROP_DRIVE("drive", sPAPRNVRAM, drive), + DEFINE_PROP_END_OF_LIST(), +}; + +static void spapr_nvram_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass); + + k->init = spapr_nvram_init; + k->devnode = spapr_nvram_devnode; + k->dt_name = "nvram"; + k->dt_type = "nvram"; + k->dt_compatible = "qemu,spapr-nvram"; + dc->props = spapr_nvram_properties; +} + +static const TypeInfo spapr_nvram_type_info = { + .name = "spapr-nvram", + .parent = TYPE_VIO_SPAPR_DEVICE, + .instance_size = sizeof(sPAPRNVRAM), + .class_init = spapr_nvram_class_init, +}; + +static void spapr_nvram_register_types(void) +{ + type_register_static(&spapr_nvram_type_info); +} + +type_init(spapr_nvram_register_types) |