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/*
* 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 "sysemu/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)
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