| /* |
| * 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 "qemu/osdep.h" |
| #include "qemu/module.h" |
| #include "qemu/units.h" |
| #include "qapi/error.h" |
| #include "cpu.h" |
| #include <libfdt.h> |
| |
| #include "sysemu/block-backend.h" |
| #include "sysemu/device_tree.h" |
| #include "sysemu/sysemu.h" |
| #include "sysemu/runstate.h" |
| #include "hw/sysbus.h" |
| #include "migration/vmstate.h" |
| #include "hw/nvram/chrp_nvram.h" |
| #include "hw/ppc/spapr.h" |
| #include "hw/ppc/spapr_vio.h" |
| #include "hw/qdev-properties.h" |
| |
| typedef struct SpaprNvram { |
| SpaprVioDevice sdev; |
| uint32_t size; |
| uint8_t *buf; |
| BlockBackend *blk; |
| VMChangeStateEntry *vmstate; |
| } SpaprNvram; |
| |
| #define TYPE_VIO_SPAPR_NVRAM "spapr-nvram" |
| #define VIO_SPAPR_NVRAM(obj) \ |
| OBJECT_CHECK(SpaprNvram, (obj), TYPE_VIO_SPAPR_NVRAM) |
| |
| #define MIN_NVRAM_SIZE (8 * KiB) |
| #define DEFAULT_NVRAM_SIZE (64 * KiB) |
| #define MAX_NVRAM_SIZE (1 * MiB) |
| |
| static void rtas_nvram_fetch(PowerPCCPU *cpu, SpaprMachineState *spapr, |
| uint32_t token, uint32_t nargs, |
| target_ulong args, |
| uint32_t nret, target_ulong rets) |
| { |
| SpaprNvram *nvram = spapr->nvram; |
| hwaddr offset, buffer, len; |
| void *membuf; |
| |
| if ((nargs != 3) || (nret != 2)) { |
| rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); |
| return; |
| } |
| |
| if (!nvram) { |
| rtas_st(rets, 0, RTAS_OUT_HW_ERROR); |
| 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, RTAS_OUT_PARAM_ERROR); |
| rtas_st(rets, 1, 0); |
| return; |
| } |
| |
| assert(nvram->buf); |
| |
| membuf = cpu_physical_memory_map(buffer, &len, 1); |
| memcpy(membuf, nvram->buf + offset, len); |
| cpu_physical_memory_unmap(membuf, len, 1, len); |
| |
| rtas_st(rets, 0, RTAS_OUT_SUCCESS); |
| rtas_st(rets, 1, len); |
| } |
| |
| static void rtas_nvram_store(PowerPCCPU *cpu, SpaprMachineState *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, RTAS_OUT_PARAM_ERROR); |
| return; |
| } |
| |
| if (!nvram) { |
| rtas_st(rets, 0, RTAS_OUT_HW_ERROR); |
| 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, RTAS_OUT_PARAM_ERROR); |
| return; |
| } |
| |
| membuf = cpu_physical_memory_map(buffer, &len, 0); |
| |
| alen = len; |
| if (nvram->blk) { |
| alen = blk_pwrite(nvram->blk, offset, membuf, len, 0); |
| } |
| |
| assert(nvram->buf); |
| memcpy(nvram->buf + offset, membuf, len); |
| |
| cpu_physical_memory_unmap(membuf, len, 0, len); |
| |
| rtas_st(rets, 0, (alen < len) ? RTAS_OUT_HW_ERROR : RTAS_OUT_SUCCESS); |
| rtas_st(rets, 1, (alen < 0) ? 0 : alen); |
| } |
| |
| static void spapr_nvram_realize(SpaprVioDevice *dev, Error **errp) |
| { |
| SpaprNvram *nvram = VIO_SPAPR_NVRAM(dev); |
| int ret; |
| |
| if (nvram->blk) { |
| int64_t len = blk_getlength(nvram->blk); |
| |
| if (len < 0) { |
| error_setg_errno(errp, -len, |
| "could not get length of backing image"); |
| return; |
| } |
| |
| nvram->size = len; |
| |
| ret = blk_set_perm(nvram->blk, |
| BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE, |
| BLK_PERM_ALL, errp); |
| if (ret < 0) { |
| return; |
| } |
| } else { |
| nvram->size = DEFAULT_NVRAM_SIZE; |
| } |
| |
| nvram->buf = g_malloc0(nvram->size); |
| |
| if ((nvram->size < MIN_NVRAM_SIZE) || (nvram->size > MAX_NVRAM_SIZE)) { |
| error_setg(errp, |
| "spapr-nvram must be between %" PRId64 |
| " and %" PRId64 " bytes in size", |
| MIN_NVRAM_SIZE, MAX_NVRAM_SIZE); |
| return; |
| } |
| |
| if (nvram->blk) { |
| int alen = blk_pread(nvram->blk, 0, nvram->buf, nvram->size); |
| |
| if (alen != nvram->size) { |
| error_setg(errp, "can't read spapr-nvram contents"); |
| return; |
| } |
| } else if (nb_prom_envs > 0) { |
| /* Create a system partition to pass the -prom-env variables */ |
| chrp_nvram_create_system_partition(nvram->buf, MIN_NVRAM_SIZE / 4); |
| chrp_nvram_create_free_partition(&nvram->buf[MIN_NVRAM_SIZE / 4], |
| nvram->size - MIN_NVRAM_SIZE / 4); |
| } |
| |
| spapr_rtas_register(RTAS_NVRAM_FETCH, "nvram-fetch", rtas_nvram_fetch); |
| spapr_rtas_register(RTAS_NVRAM_STORE, "nvram-store", rtas_nvram_store); |
| } |
| |
| static int spapr_nvram_devnode(SpaprVioDevice *dev, void *fdt, int node_off) |
| { |
| SpaprNvram *nvram = VIO_SPAPR_NVRAM(dev); |
| |
| return fdt_setprop_cell(fdt, node_off, "#bytes", nvram->size); |
| } |
| |
| static int spapr_nvram_pre_load(void *opaque) |
| { |
| SpaprNvram *nvram = VIO_SPAPR_NVRAM(opaque); |
| |
| g_free(nvram->buf); |
| nvram->buf = NULL; |
| nvram->size = 0; |
| |
| return 0; |
| } |
| |
| static void postload_update_cb(void *opaque, int running, RunState state) |
| { |
| SpaprNvram *nvram = opaque; |
| |
| /* This is called after bdrv_invalidate_cache_all. */ |
| |
| qemu_del_vm_change_state_handler(nvram->vmstate); |
| nvram->vmstate = NULL; |
| |
| blk_pwrite(nvram->blk, 0, nvram->buf, nvram->size, 0); |
| } |
| |
| static int spapr_nvram_post_load(void *opaque, int version_id) |
| { |
| SpaprNvram *nvram = VIO_SPAPR_NVRAM(opaque); |
| |
| if (nvram->blk) { |
| nvram->vmstate = qemu_add_vm_change_state_handler(postload_update_cb, |
| nvram); |
| } |
| |
| return 0; |
| } |
| |
| static const VMStateDescription vmstate_spapr_nvram = { |
| .name = "spapr_nvram", |
| .version_id = 1, |
| .minimum_version_id = 1, |
| .pre_load = spapr_nvram_pre_load, |
| .post_load = spapr_nvram_post_load, |
| .fields = (VMStateField[]) { |
| VMSTATE_UINT32(size, SpaprNvram), |
| VMSTATE_VBUFFER_ALLOC_UINT32(buf, SpaprNvram, 1, NULL, size), |
| VMSTATE_END_OF_LIST() |
| }, |
| }; |
| |
| static Property spapr_nvram_properties[] = { |
| DEFINE_SPAPR_PROPERTIES(SpaprNvram, sdev), |
| DEFINE_PROP_DRIVE("drive", SpaprNvram, blk), |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static void spapr_nvram_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| SpaprVioDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass); |
| |
| k->realize = spapr_nvram_realize; |
| k->devnode = spapr_nvram_devnode; |
| k->dt_name = "nvram"; |
| k->dt_type = "nvram"; |
| k->dt_compatible = "qemu,spapr-nvram"; |
| set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
| device_class_set_props(dc, spapr_nvram_properties); |
| dc->vmsd = &vmstate_spapr_nvram; |
| /* Reason: Internal device only, uses spapr_rtas_register() in realize() */ |
| dc->user_creatable = false; |
| } |
| |
| static const TypeInfo spapr_nvram_type_info = { |
| .name = TYPE_VIO_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) |