/* Support for generating ACPI tables and passing them to Guests
 *
 * ARM virt ACPI generation
 *
 * Copyright (C) 2008-2010  Kevin O'Connor <kevin@koconnor.net>
 * Copyright (C) 2006 Fabrice Bellard
 * Copyright (C) 2013 Red Hat Inc
 *
 * Author: Michael S. Tsirkin <mst@redhat.com>
 *
 * Copyright (c) 2015 HUAWEI TECHNOLOGIES CO.,LTD.
 *
 * Author: Shannon Zhao <zhaoshenglong@huawei.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License along
 * with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include "qemu-common.h"
#include "hw/arm/virt-acpi-build.h"
#include "qemu/bitmap.h"
#include "trace.h"
#include "qom/cpu.h"
#include "target-arm/cpu.h"
#include "hw/acpi/acpi-defs.h"
#include "hw/acpi/acpi.h"
#include "hw/nvram/fw_cfg.h"
#include "hw/acpi/bios-linker-loader.h"
#include "hw/loader.h"
#include "hw/hw.h"
#include "hw/acpi/aml-build.h"

typedef
struct AcpiBuildState {
    /* Copy of table in RAM (for patching). */
    MemoryRegion *table_mr;
    MemoryRegion *rsdp_mr;
    MemoryRegion *linker_mr;
    /* Is table patched? */
    bool patched;
    VirtGuestInfo *guest_info;
} AcpiBuildState;

static
void virt_acpi_build(VirtGuestInfo *guest_info, AcpiBuildTables *tables)
{
    GArray *table_offsets;

    table_offsets = g_array_new(false, true /* clear */,
                                        sizeof(uint32_t));

    bios_linker_loader_alloc(tables->linker, ACPI_BUILD_TABLE_FILE,
                             64, false /* high memory */);

    /*
     * The ACPI v5.1 tables for Hardware-reduced ACPI platform are:
     * RSDP
     * RSDT
     * FADT
     * GTDT
     * MADT
     * DSDT
     */

    /* Cleanup memory that's no longer used. */
    g_array_free(table_offsets, true);
}

static void acpi_ram_update(MemoryRegion *mr, GArray *data)
{
    uint32_t size = acpi_data_len(data);

    /* Make sure RAM size is correct - in case it got changed
     * e.g. by migration */
    memory_region_ram_resize(mr, size, &error_abort);

    memcpy(memory_region_get_ram_ptr(mr), data->data, size);
    memory_region_set_dirty(mr, 0, size);
}

static void virt_acpi_build_update(void *build_opaque, uint32_t offset)
{
    AcpiBuildState *build_state = build_opaque;
    AcpiBuildTables tables;

    /* No state to update or already patched? Nothing to do. */
    if (!build_state || build_state->patched) {
        return;
    }
    build_state->patched = true;

    acpi_build_tables_init(&tables);

    virt_acpi_build(build_state->guest_info, &tables);

    acpi_ram_update(build_state->table_mr, tables.table_data);
    acpi_ram_update(build_state->rsdp_mr, tables.rsdp);
    acpi_ram_update(build_state->linker_mr, tables.linker);


    acpi_build_tables_cleanup(&tables, true);
}

static void virt_acpi_build_reset(void *build_opaque)
{
    AcpiBuildState *build_state = build_opaque;
    build_state->patched = false;
}

static MemoryRegion *acpi_add_rom_blob(AcpiBuildState *build_state,
                                       GArray *blob, const char *name,
                                       uint64_t max_size)
{
    return rom_add_blob(name, blob->data, acpi_data_len(blob), max_size, -1,
                        name, virt_acpi_build_update, build_state);
}

static const VMStateDescription vmstate_virt_acpi_build = {
    .name = "virt_acpi_build",
    .version_id = 1,
    .minimum_version_id = 1,
    .fields = (VMStateField[]) {
        VMSTATE_BOOL(patched, AcpiBuildState),
        VMSTATE_END_OF_LIST()
    },
};

void virt_acpi_setup(VirtGuestInfo *guest_info)
{
    AcpiBuildTables tables;
    AcpiBuildState *build_state;

    if (!guest_info->fw_cfg) {
        trace_virt_acpi_setup();
        return;
    }

    if (!acpi_enabled) {
        trace_virt_acpi_setup();
        return;
    }

    build_state = g_malloc0(sizeof *build_state);
    build_state->guest_info = guest_info;

    acpi_build_tables_init(&tables);
    virt_acpi_build(build_state->guest_info, &tables);

    /* Now expose it all to Guest */
    build_state->table_mr = acpi_add_rom_blob(build_state, tables.table_data,
                                               ACPI_BUILD_TABLE_FILE,
                                               ACPI_BUILD_TABLE_MAX_SIZE);
    assert(build_state->table_mr != NULL);

    build_state->linker_mr =
        acpi_add_rom_blob(build_state, tables.linker, "etc/table-loader", 0);

    fw_cfg_add_file(guest_info->fw_cfg, ACPI_BUILD_TPMLOG_FILE,
                    tables.tcpalog->data, acpi_data_len(tables.tcpalog));

    build_state->rsdp_mr = acpi_add_rom_blob(build_state, tables.rsdp,
                                              ACPI_BUILD_RSDP_FILE, 0);

    qemu_register_reset(virt_acpi_build_reset, build_state);
    virt_acpi_build_reset(build_state);
    vmstate_register(NULL, 0, &vmstate_virt_acpi_build, build_state);

    /* Cleanup tables but don't free the memory: we track it
     * in build_state.
     */
    acpi_build_tables_cleanup(&tables, false);
}