root / hw / nvram / spapr_nvram.c @ 914e29d2
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/*
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* QEMU sPAPR NVRAM emulation
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*
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* Copyright (C) 2012 David Gibson, IBM Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <libfdt.h> |
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#include "sysemu/device_tree.h" |
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#include "hw/sysbus.h" |
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#include "hw/ppc/spapr.h" |
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#include "hw/ppc/spapr_vio.h" |
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typedef struct sPAPRNVRAM { |
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VIOsPAPRDevice sdev; |
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uint32_t size; |
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uint8_t *buf; |
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BlockDriverState *drive; |
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} sPAPRNVRAM; |
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#define MIN_NVRAM_SIZE 8192 |
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#define DEFAULT_NVRAM_SIZE 65536 |
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#define MAX_NVRAM_SIZE (UINT16_MAX * 16) |
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static void rtas_nvram_fetch(sPAPREnvironment *spapr, |
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uint32_t token, uint32_t nargs, |
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target_ulong args, |
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uint32_t nret, target_ulong rets) |
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{ |
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sPAPRNVRAM *nvram = spapr->nvram; |
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hwaddr offset, buffer, len; |
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int alen;
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void *membuf;
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if ((nargs != 3) || (nret != 2)) { |
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rtas_st(rets, 0, -3); |
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return;
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} |
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if (!nvram) {
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rtas_st(rets, 0, -1); |
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rtas_st(rets, 1, 0); |
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return;
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} |
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offset = rtas_ld(args, 0);
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buffer = rtas_ld(args, 1);
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len = rtas_ld(args, 2);
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if (((offset + len) < offset)
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|| ((offset + len) > nvram->size)) { |
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rtas_st(rets, 0, -3); |
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rtas_st(rets, 1, 0); |
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return;
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} |
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membuf = cpu_physical_memory_map(buffer, &len, 1);
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if (nvram->drive) {
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alen = bdrv_pread(nvram->drive, offset, membuf, len); |
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} else {
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assert(nvram->buf); |
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memcpy(membuf, nvram->buf + offset, len); |
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alen = len; |
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} |
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cpu_physical_memory_unmap(membuf, len, 1, len);
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rtas_st(rets, 0, (alen < len) ? -1 : 0); |
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rtas_st(rets, 1, (alen < 0) ? 0 : alen); |
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} |
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static void rtas_nvram_store(sPAPREnvironment *spapr, |
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uint32_t token, uint32_t nargs, |
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target_ulong args, |
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uint32_t nret, target_ulong rets) |
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{ |
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sPAPRNVRAM *nvram = spapr->nvram; |
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hwaddr offset, buffer, len; |
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int alen;
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void *membuf;
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if ((nargs != 3) || (nret != 2)) { |
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rtas_st(rets, 0, -3); |
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return;
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} |
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if (!nvram) {
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rtas_st(rets, 0, -1); |
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return;
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} |
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offset = rtas_ld(args, 0);
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buffer = rtas_ld(args, 1);
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len = rtas_ld(args, 2);
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if (((offset + len) < offset)
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|| ((offset + len) > nvram->size)) { |
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rtas_st(rets, 0, -3); |
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return;
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} |
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membuf = cpu_physical_memory_map(buffer, &len, 0);
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if (nvram->drive) {
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alen = bdrv_pwrite(nvram->drive, offset, membuf, len); |
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} else {
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assert(nvram->buf); |
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memcpy(nvram->buf + offset, membuf, len); |
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alen = len; |
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} |
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cpu_physical_memory_unmap(membuf, len, 0, len);
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rtas_st(rets, 0, (alen < len) ? -1 : 0); |
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rtas_st(rets, 1, (alen < 0) ? 0 : alen); |
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} |
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static int spapr_nvram_init(VIOsPAPRDevice *dev) |
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{ |
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sPAPRNVRAM *nvram = (sPAPRNVRAM *)dev; |
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if (nvram->drive) {
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nvram->size = bdrv_getlength(nvram->drive); |
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} else {
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nvram->size = DEFAULT_NVRAM_SIZE; |
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nvram->buf = g_malloc0(nvram->size); |
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} |
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if ((nvram->size < MIN_NVRAM_SIZE) || (nvram->size > MAX_NVRAM_SIZE)) {
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fprintf(stderr, "spapr-nvram must be between %d and %d bytes in size\n",
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MIN_NVRAM_SIZE, MAX_NVRAM_SIZE); |
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return -1; |
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} |
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spapr_rtas_register("nvram-fetch", rtas_nvram_fetch);
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spapr_rtas_register("nvram-store", rtas_nvram_store);
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return 0; |
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} |
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static int spapr_nvram_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off) |
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{ |
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sPAPRNVRAM *nvram = (sPAPRNVRAM *)dev; |
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return fdt_setprop_cell(fdt, node_off, "#bytes", nvram->size); |
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} |
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static Property spapr_nvram_properties[] = {
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DEFINE_SPAPR_PROPERTIES(sPAPRNVRAM, sdev), |
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DEFINE_PROP_DRIVE("drive", sPAPRNVRAM, drive),
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DEFINE_PROP_END_OF_LIST(), |
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}; |
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static void spapr_nvram_class_init(ObjectClass *klass, void *data) |
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{ |
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DeviceClass *dc = DEVICE_CLASS(klass); |
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VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass); |
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k->init = spapr_nvram_init; |
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k->devnode = spapr_nvram_devnode; |
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k->dt_name = "nvram";
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k->dt_type = "nvram";
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k->dt_compatible = "qemu,spapr-nvram";
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dc->props = spapr_nvram_properties; |
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} |
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static const TypeInfo spapr_nvram_type_info = { |
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.name = "spapr-nvram",
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.parent = TYPE_VIO_SPAPR_DEVICE, |
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.instance_size = sizeof(sPAPRNVRAM),
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.class_init = spapr_nvram_class_init, |
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}; |
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static void spapr_nvram_register_types(void) |
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{ |
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type_register_static(&spapr_nvram_type_info); |
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} |
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type_init(spapr_nvram_register_types) |