/* 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/osdep.h"
#include "qapi/error.h"
#include "qemu/bitmap.h"
#include "trace.h"
#include "hw/core/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/acpi/aml-build.h"
#include "hw/acpi/utils.h"
#include "hw/acpi/pci.h"
#include "hw/acpi/memory_hotplug.h"
#include "hw/acpi/generic_event_device.h"
#include "hw/acpi/tpm.h"
#include "hw/pci/pcie_host.h"
#include "hw/pci/pci.h"
#include "hw/pci-host/gpex.h"
#include "hw/arm/virt.h"
#include "hw/mem/nvdimm.h"
#include "hw/platform-bus.h"
#include "sysemu/numa.h"
#include "sysemu/reset.h"
#include "sysemu/tpm.h"
#include "kvm_arm.h"
#include "migration/vmstate.h"
#include "hw/acpi/ghes.h"

#define ARM_SPI_BASE 32

#define ACPI_BUILD_TABLE_SIZE             0x20000

static void acpi_dsdt_add_cpus(Aml *scope, VirtMachineState *vms)
{
    MachineState *ms = MACHINE(vms);
    uint16_t i;

    for (i = 0; i < ms->smp.cpus; i++) {
        Aml *dev = aml_device("C%.03X", i);
        aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0007")));
        aml_append(dev, aml_name_decl("_UID", aml_int(i)));
        aml_append(scope, dev);
    }
}

static void acpi_dsdt_add_uart(Aml *scope, const MemMapEntry *uart_memmap,
                                           uint32_t uart_irq)
{
    Aml *dev = aml_device("COM0");
    aml_append(dev, aml_name_decl("_HID", aml_string("ARMH0011")));
    aml_append(dev, aml_name_decl("_UID", aml_int(0)));

    Aml *crs = aml_resource_template();
    aml_append(crs, aml_memory32_fixed(uart_memmap->base,
                                       uart_memmap->size, AML_READ_WRITE));
    aml_append(crs,
               aml_interrupt(AML_CONSUMER, AML_LEVEL, AML_ACTIVE_HIGH,
                             AML_EXCLUSIVE, &uart_irq, 1));
    aml_append(dev, aml_name_decl("_CRS", crs));

    aml_append(scope, dev);
}

static void acpi_dsdt_add_fw_cfg(Aml *scope, const MemMapEntry *fw_cfg_memmap)
{
    Aml *dev = aml_device("FWCF");
    aml_append(dev, aml_name_decl("_HID", aml_string("QEMU0002")));
    /* device present, functioning, decoding, not shown in UI */
    aml_append(dev, aml_name_decl("_STA", aml_int(0xB)));
    aml_append(dev, aml_name_decl("_CCA", aml_int(1)));

    Aml *crs = aml_resource_template();
    aml_append(crs, aml_memory32_fixed(fw_cfg_memmap->base,
                                       fw_cfg_memmap->size, AML_READ_WRITE));
    aml_append(dev, aml_name_decl("_CRS", crs));
    aml_append(scope, dev);
}

static void acpi_dsdt_add_flash(Aml *scope, const MemMapEntry *flash_memmap)
{
    Aml *dev, *crs;
    hwaddr base = flash_memmap->base;
    hwaddr size = flash_memmap->size / 2;

    dev = aml_device("FLS0");
    aml_append(dev, aml_name_decl("_HID", aml_string("LNRO0015")));
    aml_append(dev, aml_name_decl("_UID", aml_int(0)));

    crs = aml_resource_template();
    aml_append(crs, aml_memory32_fixed(base, size, AML_READ_WRITE));
    aml_append(dev, aml_name_decl("_CRS", crs));
    aml_append(scope, dev);

    dev = aml_device("FLS1");
    aml_append(dev, aml_name_decl("_HID", aml_string("LNRO0015")));
    aml_append(dev, aml_name_decl("_UID", aml_int(1)));
    crs = aml_resource_template();
    aml_append(crs, aml_memory32_fixed(base + size, size, AML_READ_WRITE));
    aml_append(dev, aml_name_decl("_CRS", crs));
    aml_append(scope, dev);
}

static void acpi_dsdt_add_virtio(Aml *scope,
                                 const MemMapEntry *virtio_mmio_memmap,
                                 uint32_t mmio_irq, int num)
{
    hwaddr base = virtio_mmio_memmap->base;
    hwaddr size = virtio_mmio_memmap->size;
    int i;

    for (i = 0; i < num; i++) {
        uint32_t irq = mmio_irq + i;
        Aml *dev = aml_device("VR%02u", i);
        aml_append(dev, aml_name_decl("_HID", aml_string("LNRO0005")));
        aml_append(dev, aml_name_decl("_UID", aml_int(i)));
        aml_append(dev, aml_name_decl("_CCA", aml_int(1)));

        Aml *crs = aml_resource_template();
        aml_append(crs, aml_memory32_fixed(base, size, AML_READ_WRITE));
        aml_append(crs,
                   aml_interrupt(AML_CONSUMER, AML_LEVEL, AML_ACTIVE_HIGH,
                                 AML_EXCLUSIVE, &irq, 1));
        aml_append(dev, aml_name_decl("_CRS", crs));
        aml_append(scope, dev);
        base += size;
    }
}

static void acpi_dsdt_add_pci(Aml *scope, const MemMapEntry *memmap,
                              uint32_t irq, bool use_highmem, bool highmem_ecam,
                              VirtMachineState *vms)
{
    int ecam_id = VIRT_ECAM_ID(highmem_ecam);
    struct GPEXConfig cfg = {
        .mmio32 = memmap[VIRT_PCIE_MMIO],
        .pio    = memmap[VIRT_PCIE_PIO],
        .ecam   = memmap[ecam_id],
        .irq    = irq,
        .bus    = vms->bus,
    };

    if (use_highmem) {
        cfg.mmio64 = memmap[VIRT_HIGH_PCIE_MMIO];
    }

    acpi_dsdt_add_gpex(scope, &cfg);
}

static void acpi_dsdt_add_gpio(Aml *scope, const MemMapEntry *gpio_memmap,
                                           uint32_t gpio_irq)
{
    Aml *dev = aml_device("GPO0");
    aml_append(dev, aml_name_decl("_HID", aml_string("ARMH0061")));
    aml_append(dev, aml_name_decl("_UID", aml_int(0)));

    Aml *crs = aml_resource_template();
    aml_append(crs, aml_memory32_fixed(gpio_memmap->base, gpio_memmap->size,
                                       AML_READ_WRITE));
    aml_append(crs, aml_interrupt(AML_CONSUMER, AML_LEVEL, AML_ACTIVE_HIGH,
                                  AML_EXCLUSIVE, &gpio_irq, 1));
    aml_append(dev, aml_name_decl("_CRS", crs));

    Aml *aei = aml_resource_template();
    /* Pin 3 for power button */
    const uint32_t pin_list[1] = {3};
    aml_append(aei, aml_gpio_int(AML_CONSUMER, AML_EDGE, AML_ACTIVE_HIGH,
                                 AML_EXCLUSIVE, AML_PULL_UP, 0, pin_list, 1,
                                 "GPO0", NULL, 0));
    aml_append(dev, aml_name_decl("_AEI", aei));

    /* _E03 is handle for power button */
    Aml *method = aml_method("_E03", 0, AML_NOTSERIALIZED);
    aml_append(method, aml_notify(aml_name(ACPI_POWER_BUTTON_DEVICE),
                                  aml_int(0x80)));
    aml_append(dev, method);
    aml_append(scope, dev);
}

static void acpi_dsdt_add_tpm(Aml *scope, VirtMachineState *vms)
{
    PlatformBusDevice *pbus = PLATFORM_BUS_DEVICE(vms->platform_bus_dev);
    hwaddr pbus_base = vms->memmap[VIRT_PLATFORM_BUS].base;
    SysBusDevice *sbdev = SYS_BUS_DEVICE(tpm_find());
    MemoryRegion *sbdev_mr;
    hwaddr tpm_base;

    if (!sbdev) {
        return;
    }

    tpm_base = platform_bus_get_mmio_addr(pbus, sbdev, 0);
    assert(tpm_base != -1);

    tpm_base += pbus_base;

    sbdev_mr = sysbus_mmio_get_region(sbdev, 0);

    Aml *dev = aml_device("TPM0");
    aml_append(dev, aml_name_decl("_HID", aml_string("MSFT0101")));
    aml_append(dev, aml_name_decl("_UID", aml_int(0)));

    Aml *crs = aml_resource_template();
    aml_append(crs,
               aml_memory32_fixed(tpm_base,
                                  (uint32_t)memory_region_size(sbdev_mr),
                                  AML_READ_WRITE));
    aml_append(dev, aml_name_decl("_CRS", crs));
    aml_append(scope, dev);
}

static void
build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
{
    int nb_nodes, iort_start = table_data->len;
    AcpiIortIdMapping *idmap;
    AcpiIortItsGroup *its;
    AcpiIortTable *iort;
    AcpiIortSmmu3 *smmu;
    size_t node_size, iort_node_offset, iort_length, smmu_offset = 0;
    AcpiIortRC *rc;

    iort = acpi_data_push(table_data, sizeof(*iort));

    if (vms->iommu == VIRT_IOMMU_SMMUV3) {
        nb_nodes = 3; /* RC, ITS, SMMUv3 */
    } else {
        nb_nodes = 2; /* RC, ITS */
    }

    iort_length = sizeof(*iort);
    iort->node_count = cpu_to_le32(nb_nodes);
    /*
     * Use a copy in case table_data->data moves during acpi_data_push
     * operations.
     */
    iort_node_offset = sizeof(*iort);
    iort->node_offset = cpu_to_le32(iort_node_offset);

    /* ITS group node */
    node_size =  sizeof(*its) + sizeof(uint32_t);
    iort_length += node_size;
    its = acpi_data_push(table_data, node_size);

    its->type = ACPI_IORT_NODE_ITS_GROUP;
    its->length = cpu_to_le16(node_size);
    its->its_count = cpu_to_le32(1);
    its->identifiers[0] = 0; /* MADT translation_id */

    if (vms->iommu == VIRT_IOMMU_SMMUV3) {
        int irq =  vms->irqmap[VIRT_SMMU] + ARM_SPI_BASE;

        /* SMMUv3 node */
        smmu_offset = iort_node_offset + node_size;
        node_size = sizeof(*smmu) + sizeof(*idmap);
        iort_length += node_size;
        smmu = acpi_data_push(table_data, node_size);

        smmu->type = ACPI_IORT_NODE_SMMU_V3;
        smmu->length = cpu_to_le16(node_size);
        smmu->mapping_count = cpu_to_le32(1);
        smmu->mapping_offset = cpu_to_le32(sizeof(*smmu));
        smmu->base_address = cpu_to_le64(vms->memmap[VIRT_SMMU].base);
        smmu->flags = cpu_to_le32(ACPI_IORT_SMMU_V3_COHACC_OVERRIDE);
        smmu->event_gsiv = cpu_to_le32(irq);
        smmu->pri_gsiv = cpu_to_le32(irq + 1);
        smmu->gerr_gsiv = cpu_to_le32(irq + 2);
        smmu->sync_gsiv = cpu_to_le32(irq + 3);

        /* Identity RID mapping covering the whole input RID range */
        idmap = &smmu->id_mapping_array[0];
        idmap->input_base = 0;
        idmap->id_count = cpu_to_le32(0xFFFF);
        idmap->output_base = 0;
        /* output IORT node is the ITS group node (the first node) */
        idmap->output_reference = cpu_to_le32(iort_node_offset);
    }

    /* Root Complex Node */
    node_size = sizeof(*rc) + sizeof(*idmap);
    iort_length += node_size;
    rc = acpi_data_push(table_data, node_size);

    rc->type = ACPI_IORT_NODE_PCI_ROOT_COMPLEX;
    rc->length = cpu_to_le16(node_size);
    rc->mapping_count = cpu_to_le32(1);
    rc->mapping_offset = cpu_to_le32(sizeof(*rc));

    /* fully coherent device */
    rc->memory_properties.cache_coherency = cpu_to_le32(1);
    rc->memory_properties.memory_flags = 0x3; /* CCA = CPM = DCAS = 1 */
    rc->pci_segment_number = 0; /* MCFG pci_segment */

    /* Identity RID mapping covering the whole input RID range */
    idmap = &rc->id_mapping_array[0];
    idmap->input_base = 0;
    idmap->id_count = cpu_to_le32(0xFFFF);
    idmap->output_base = 0;

    if (vms->iommu == VIRT_IOMMU_SMMUV3) {
        /* output IORT node is the smmuv3 node */
        idmap->output_reference = cpu_to_le32(smmu_offset);
    } else {
        /* output IORT node is the ITS group node (the first node) */
        idmap->output_reference = cpu_to_le32(iort_node_offset);
    }

    /*
     * Update the pointer address in case table_data->data moves during above
     * acpi_data_push operations.
     */
    iort = (AcpiIortTable *)(table_data->data + iort_start);
    iort->length = cpu_to_le32(iort_length);

    build_header(linker, table_data, (void *)(table_data->data + iort_start),
                 "IORT", table_data->len - iort_start, 0, vms->oem_id,
                 vms->oem_table_id);
}

static void
build_spcr(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
{
    AcpiSerialPortConsoleRedirection *spcr;
    const MemMapEntry *uart_memmap = &vms->memmap[VIRT_UART];
    int irq = vms->irqmap[VIRT_UART] + ARM_SPI_BASE;
    int spcr_start = table_data->len;

    spcr = acpi_data_push(table_data, sizeof(*spcr));

    spcr->interface_type = 0x3;    /* ARM PL011 UART */

    spcr->base_address.space_id = AML_SYSTEM_MEMORY;
    spcr->base_address.bit_width = 8;
    spcr->base_address.bit_offset = 0;
    spcr->base_address.access_width = 1;
    spcr->base_address.address = cpu_to_le64(uart_memmap->base);

    spcr->interrupt_types = (1 << 3); /* Bit[3] ARMH GIC interrupt */
    spcr->gsi = cpu_to_le32(irq);  /* Global System Interrupt */

    spcr->baud = 3;                /* Baud Rate: 3 = 9600 */
    spcr->parity = 0;              /* No Parity */
    spcr->stopbits = 1;            /* 1 Stop bit */
    spcr->flowctrl = (1 << 1);     /* Bit[1] = RTS/CTS hardware flow control */
    spcr->term_type = 0;           /* Terminal Type: 0 = VT100 */

    spcr->pci_device_id = 0xffff;  /* PCI Device ID: not a PCI device */
    spcr->pci_vendor_id = 0xffff;  /* PCI Vendor ID: not a PCI device */

    build_header(linker, table_data, (void *)(table_data->data + spcr_start),
                 "SPCR", table_data->len - spcr_start, 2, vms->oem_id,
                 vms->oem_table_id);
}

static void
build_srat(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
{
    AcpiSystemResourceAffinityTable *srat;
    AcpiSratProcessorGiccAffinity *core;
    AcpiSratMemoryAffinity *numamem;
    int i, srat_start;
    uint64_t mem_base;
    MachineClass *mc = MACHINE_GET_CLASS(vms);
    MachineState *ms = MACHINE(vms);
    const CPUArchIdList *cpu_list = mc->possible_cpu_arch_ids(ms);

    srat_start = table_data->len;
    srat = acpi_data_push(table_data, sizeof(*srat));
    srat->reserved1 = cpu_to_le32(1);

    for (i = 0; i < cpu_list->len; ++i) {
        core = acpi_data_push(table_data, sizeof(*core));
        core->type = ACPI_SRAT_PROCESSOR_GICC;
        core->length = sizeof(*core);
        core->proximity = cpu_to_le32(cpu_list->cpus[i].props.node_id);
        core->acpi_processor_uid = cpu_to_le32(i);
        core->flags = cpu_to_le32(1);
    }

    mem_base = vms->memmap[VIRT_MEM].base;
    for (i = 0; i < ms->numa_state->num_nodes; ++i) {
        if (ms->numa_state->nodes[i].node_mem > 0) {
            numamem = acpi_data_push(table_data, sizeof(*numamem));
            build_srat_memory(numamem, mem_base,
                              ms->numa_state->nodes[i].node_mem, i,
                              MEM_AFFINITY_ENABLED);
            mem_base += ms->numa_state->nodes[i].node_mem;
        }
    }

    if (ms->nvdimms_state->is_enabled) {
        nvdimm_build_srat(table_data);
    }

    if (ms->device_memory) {
        numamem = acpi_data_push(table_data, sizeof *numamem);
        build_srat_memory(numamem, ms->device_memory->base,
                          memory_region_size(&ms->device_memory->mr),
                          ms->numa_state->num_nodes - 1,
                          MEM_AFFINITY_HOTPLUGGABLE | MEM_AFFINITY_ENABLED);
    }

    build_header(linker, table_data, (void *)(table_data->data + srat_start),
                 "SRAT", table_data->len - srat_start, 3, vms->oem_id,
                 vms->oem_table_id);
}

/* GTDT */
static void
build_gtdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
{
    VirtMachineClass *vmc = VIRT_MACHINE_GET_CLASS(vms);
    int gtdt_start = table_data->len;
    AcpiGenericTimerTable *gtdt;
    uint32_t irqflags;

    if (vmc->claim_edge_triggered_timers) {
        irqflags = ACPI_GTDT_INTERRUPT_MODE_EDGE;
    } else {
        irqflags = ACPI_GTDT_INTERRUPT_MODE_LEVEL;
    }

    gtdt = acpi_data_push(table_data, sizeof *gtdt);
    /* The interrupt values are the same with the device tree when adding 16 */
    gtdt->secure_el1_interrupt = cpu_to_le32(ARCH_TIMER_S_EL1_IRQ + 16);
    gtdt->secure_el1_flags = cpu_to_le32(irqflags);

    gtdt->non_secure_el1_interrupt = cpu_to_le32(ARCH_TIMER_NS_EL1_IRQ + 16);
    gtdt->non_secure_el1_flags = cpu_to_le32(irqflags |
                                             ACPI_GTDT_CAP_ALWAYS_ON);

    gtdt->virtual_timer_interrupt = cpu_to_le32(ARCH_TIMER_VIRT_IRQ + 16);
    gtdt->virtual_timer_flags = cpu_to_le32(irqflags);

    gtdt->non_secure_el2_interrupt = cpu_to_le32(ARCH_TIMER_NS_EL2_IRQ + 16);
    gtdt->non_secure_el2_flags = cpu_to_le32(irqflags);

    build_header(linker, table_data,
                 (void *)(table_data->data + gtdt_start), "GTDT",
                 table_data->len - gtdt_start, 2, vms->oem_id,
                 vms->oem_table_id);
}

/* MADT */
static void
build_madt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
{
    VirtMachineClass *vmc = VIRT_MACHINE_GET_CLASS(vms);
    int madt_start = table_data->len;
    const MemMapEntry *memmap = vms->memmap;
    const int *irqmap = vms->irqmap;
    AcpiMadtGenericDistributor *gicd;
    AcpiMadtGenericMsiFrame *gic_msi;
    int i;

    acpi_data_push(table_data, sizeof(AcpiMultipleApicTable));

    gicd = acpi_data_push(table_data, sizeof *gicd);
    gicd->type = ACPI_APIC_GENERIC_DISTRIBUTOR;
    gicd->length = sizeof(*gicd);
    gicd->base_address = cpu_to_le64(memmap[VIRT_GIC_DIST].base);
    gicd->version = vms->gic_version;

    for (i = 0; i < MACHINE(vms)->smp.cpus; i++) {
        AcpiMadtGenericCpuInterface *gicc = acpi_data_push(table_data,
                                                           sizeof(*gicc));
        ARMCPU *armcpu = ARM_CPU(qemu_get_cpu(i));

        gicc->type = ACPI_APIC_GENERIC_CPU_INTERFACE;
        gicc->length = sizeof(*gicc);
        if (vms->gic_version == 2) {
            gicc->base_address = cpu_to_le64(memmap[VIRT_GIC_CPU].base);
            gicc->gich_base_address = cpu_to_le64(memmap[VIRT_GIC_HYP].base);
            gicc->gicv_base_address = cpu_to_le64(memmap[VIRT_GIC_VCPU].base);
        }
        gicc->cpu_interface_number = cpu_to_le32(i);
        gicc->arm_mpidr = cpu_to_le64(armcpu->mp_affinity);
        gicc->uid = cpu_to_le32(i);
        gicc->flags = cpu_to_le32(ACPI_MADT_GICC_ENABLED);

        if (arm_feature(&armcpu->env, ARM_FEATURE_PMU)) {
            gicc->performance_interrupt = cpu_to_le32(PPI(VIRTUAL_PMU_IRQ));
        }
        if (vms->virt) {
            gicc->vgic_interrupt = cpu_to_le32(PPI(ARCH_GIC_MAINT_IRQ));
        }
    }

    if (vms->gic_version == 3) {
        AcpiMadtGenericTranslator *gic_its;
        int nb_redist_regions = virt_gicv3_redist_region_count(vms);
        AcpiMadtGenericRedistributor *gicr = acpi_data_push(table_data,
                                                         sizeof *gicr);

        gicr->type = ACPI_APIC_GENERIC_REDISTRIBUTOR;
        gicr->length = sizeof(*gicr);
        gicr->base_address = cpu_to_le64(memmap[VIRT_GIC_REDIST].base);
        gicr->range_length = cpu_to_le32(memmap[VIRT_GIC_REDIST].size);

        if (nb_redist_regions == 2) {
            gicr = acpi_data_push(table_data, sizeof(*gicr));
            gicr->type = ACPI_APIC_GENERIC_REDISTRIBUTOR;
            gicr->length = sizeof(*gicr);
            gicr->base_address =
                cpu_to_le64(memmap[VIRT_HIGH_GIC_REDIST2].base);
            gicr->range_length =
                cpu_to_le32(memmap[VIRT_HIGH_GIC_REDIST2].size);
        }

        if (its_class_name() && !vmc->no_its) {
            gic_its = acpi_data_push(table_data, sizeof *gic_its);
            gic_its->type = ACPI_APIC_GENERIC_TRANSLATOR;
            gic_its->length = sizeof(*gic_its);
            gic_its->translation_id = 0;
            gic_its->base_address = cpu_to_le64(memmap[VIRT_GIC_ITS].base);
        }
    } else {
        gic_msi = acpi_data_push(table_data, sizeof *gic_msi);
        gic_msi->type = ACPI_APIC_GENERIC_MSI_FRAME;
        gic_msi->length = sizeof(*gic_msi);
        gic_msi->gic_msi_frame_id = 0;
        gic_msi->base_address = cpu_to_le64(memmap[VIRT_GIC_V2M].base);
        gic_msi->flags = cpu_to_le32(1);
        gic_msi->spi_count = cpu_to_le16(NUM_GICV2M_SPIS);
        gic_msi->spi_base = cpu_to_le16(irqmap[VIRT_GIC_V2M] + ARM_SPI_BASE);
    }

    build_header(linker, table_data,
                 (void *)(table_data->data + madt_start), "APIC",
                 table_data->len - madt_start, 3, vms->oem_id,
                 vms->oem_table_id);
}

/* FADT */
static void build_fadt_rev5(GArray *table_data, BIOSLinker *linker,
                            VirtMachineState *vms, unsigned dsdt_tbl_offset)
{
    /* ACPI v5.1 */
    AcpiFadtData fadt = {
        .rev = 5,
        .minor_ver = 1,
        .flags = 1 << ACPI_FADT_F_HW_REDUCED_ACPI,
        .xdsdt_tbl_offset = &dsdt_tbl_offset,
    };

    switch (vms->psci_conduit) {
    case QEMU_PSCI_CONDUIT_DISABLED:
        fadt.arm_boot_arch = 0;
        break;
    case QEMU_PSCI_CONDUIT_HVC:
        fadt.arm_boot_arch = ACPI_FADT_ARM_PSCI_COMPLIANT |
                             ACPI_FADT_ARM_PSCI_USE_HVC;
        break;
    case QEMU_PSCI_CONDUIT_SMC:
        fadt.arm_boot_arch = ACPI_FADT_ARM_PSCI_COMPLIANT;
        break;
    default:
        g_assert_not_reached();
    }

    build_fadt(table_data, linker, &fadt, vms->oem_id, vms->oem_table_id);
}

/* DSDT */
static void
build_dsdt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
{
    VirtMachineClass *vmc = VIRT_MACHINE_GET_CLASS(vms);
    Aml *scope, *dsdt;
    MachineState *ms = MACHINE(vms);
    const MemMapEntry *memmap = vms->memmap;
    const int *irqmap = vms->irqmap;

    dsdt = init_aml_allocator();
    /* Reserve space for header */
    acpi_data_push(dsdt->buf, sizeof(AcpiTableHeader));

    /* When booting the VM with UEFI, UEFI takes ownership of the RTC hardware.
     * While UEFI can use libfdt to disable the RTC device node in the DTB that
     * it passes to the OS, it cannot modify AML. Therefore, we won't generate
     * the RTC ACPI device at all when using UEFI.
     */
    scope = aml_scope("\\_SB");
    acpi_dsdt_add_cpus(scope, vms);
    acpi_dsdt_add_uart(scope, &memmap[VIRT_UART],
                       (irqmap[VIRT_UART] + ARM_SPI_BASE));
    if (vmc->acpi_expose_flash) {
        acpi_dsdt_add_flash(scope, &memmap[VIRT_FLASH]);
    }
    acpi_dsdt_add_fw_cfg(scope, &memmap[VIRT_FW_CFG]);
    acpi_dsdt_add_virtio(scope, &memmap[VIRT_MMIO],
                    (irqmap[VIRT_MMIO] + ARM_SPI_BASE), NUM_VIRTIO_TRANSPORTS);
    acpi_dsdt_add_pci(scope, memmap, (irqmap[VIRT_PCIE] + ARM_SPI_BASE),
                      vms->highmem, vms->highmem_ecam, vms);
    if (vms->acpi_dev) {
        build_ged_aml(scope, "\\_SB."GED_DEVICE,
                      HOTPLUG_HANDLER(vms->acpi_dev),
                      irqmap[VIRT_ACPI_GED] + ARM_SPI_BASE, AML_SYSTEM_MEMORY,
                      memmap[VIRT_ACPI_GED].base);
    } else {
        acpi_dsdt_add_gpio(scope, &memmap[VIRT_GPIO],
                           (irqmap[VIRT_GPIO] + ARM_SPI_BASE));
    }

    if (vms->acpi_dev) {
        uint32_t event = object_property_get_uint(OBJECT(vms->acpi_dev),
                                                  "ged-event", &error_abort);

        if (event & ACPI_GED_MEM_HOTPLUG_EVT) {
            build_memory_hotplug_aml(scope, ms->ram_slots, "\\_SB", NULL,
                                     AML_SYSTEM_MEMORY,
                                     memmap[VIRT_PCDIMM_ACPI].base);
        }
    }

    acpi_dsdt_add_power_button(scope);
    acpi_dsdt_add_tpm(scope, vms);

    aml_append(dsdt, scope);

    /* copy AML table into ACPI tables blob and patch header there */
    g_array_append_vals(table_data, dsdt->buf->data, dsdt->buf->len);
    build_header(linker, table_data,
        (void *)(table_data->data + table_data->len - dsdt->buf->len),
                 "DSDT", dsdt->buf->len, 2, vms->oem_id,
                 vms->oem_table_id);
    free_aml_allocator();
}

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

static void acpi_align_size(GArray *blob, unsigned align)
{
    /*
     * Align size to multiple of given size. This reduces the chance
     * we need to change size in the future (breaking cross version migration).
     */
    g_array_set_size(blob, ROUND_UP(acpi_data_len(blob), align));
}

static
void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
{
    VirtMachineClass *vmc = VIRT_MACHINE_GET_CLASS(vms);
    GArray *table_offsets;
    unsigned dsdt, xsdt;
    GArray *tables_blob = tables->table_data;
    MachineState *ms = MACHINE(vms);

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

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

    /* DSDT is pointed to by FADT */
    dsdt = tables_blob->len;
    build_dsdt(tables_blob, tables->linker, vms);

    /* FADT MADT GTDT MCFG SPCR pointed to by RSDT */
    acpi_add_table(table_offsets, tables_blob);
    build_fadt_rev5(tables_blob, tables->linker, vms, dsdt);

    acpi_add_table(table_offsets, tables_blob);
    build_madt(tables_blob, tables->linker, vms);

    acpi_add_table(table_offsets, tables_blob);
    build_gtdt(tables_blob, tables->linker, vms);

    acpi_add_table(table_offsets, tables_blob);
    {
        AcpiMcfgInfo mcfg = {
           .base = vms->memmap[VIRT_ECAM_ID(vms->highmem_ecam)].base,
           .size = vms->memmap[VIRT_ECAM_ID(vms->highmem_ecam)].size,
        };
        build_mcfg(tables_blob, tables->linker, &mcfg, vms->oem_id,
                   vms->oem_table_id);
    }

    acpi_add_table(table_offsets, tables_blob);
    build_spcr(tables_blob, tables->linker, vms);

    if (vms->ras) {
        build_ghes_error_table(tables->hardware_errors, tables->linker);
        acpi_add_table(table_offsets, tables_blob);
        acpi_build_hest(tables_blob, tables->linker, vms->oem_id,
                        vms->oem_table_id);
    }

    if (ms->numa_state->num_nodes > 0) {
        acpi_add_table(table_offsets, tables_blob);
        build_srat(tables_blob, tables->linker, vms);
        if (ms->numa_state->have_numa_distance) {
            acpi_add_table(table_offsets, tables_blob);
            build_slit(tables_blob, tables->linker, ms, vms->oem_id,
                       vms->oem_table_id);
        }
    }

    if (ms->nvdimms_state->is_enabled) {
        nvdimm_build_acpi(table_offsets, tables_blob, tables->linker,
                          ms->nvdimms_state, ms->ram_slots, vms->oem_id,
                          vms->oem_table_id);
    }

    if (its_class_name() && !vmc->no_its) {
        acpi_add_table(table_offsets, tables_blob);
        build_iort(tables_blob, tables->linker, vms);
    }

    if (tpm_get_version(tpm_find()) == TPM_VERSION_2_0) {
        acpi_add_table(table_offsets, tables_blob);
        build_tpm2(tables_blob, tables->linker, tables->tcpalog, vms->oem_id,
                   vms->oem_table_id);
    }

    /* XSDT is pointed to by RSDP */
    xsdt = tables_blob->len;
    build_xsdt(tables_blob, tables->linker, table_offsets, vms->oem_id,
               vms->oem_table_id);

    /* RSDP is in FSEG memory, so allocate it separately */
    {
        AcpiRsdpData rsdp_data = {
            .revision = 2,
            .oem_id = vms->oem_id,
            .xsdt_tbl_offset = &xsdt,
            .rsdt_tbl_offset = NULL,
        };
        build_rsdp(tables->rsdp, tables->linker, &rsdp_data);
    }

    /*
     * The align size is 128, warn if 64k is not enough therefore
     * the align size could be resized.
     */
    if (tables_blob->len > ACPI_BUILD_TABLE_SIZE / 2) {
        warn_report("ACPI table size %u exceeds %d bytes,"
                    " migration may not work",
                    tables_blob->len, ACPI_BUILD_TABLE_SIZE / 2);
        error_printf("Try removing CPUs, NUMA nodes, memory slots"
                     " or PCI bridges.");
    }
    acpi_align_size(tables_blob, ACPI_BUILD_TABLE_SIZE);


    /* 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)
{
    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(VIRT_MACHINE(qdev_get_machine()), &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->cmd_blob);

    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 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(VirtMachineState *vms)
{
    AcpiBuildTables tables;
    AcpiBuildState *build_state;
    AcpiGedState *acpi_ged_state;

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

    if (!virt_is_acpi_enabled(vms)) {
        trace_virt_acpi_setup();
        return;
    }

    build_state = g_malloc0(sizeof *build_state);

    acpi_build_tables_init(&tables);
    virt_acpi_build(vms, &tables);

    /* Now expose it all to Guest */
    build_state->table_mr = acpi_add_rom_blob(virt_acpi_build_update,
                                              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(virt_acpi_build_update, build_state,
                          tables.linker->cmd_blob, ACPI_BUILD_LOADER_FILE, 0);

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

    if (vms->ras) {
        assert(vms->acpi_dev);
        acpi_ged_state = ACPI_GED(vms->acpi_dev);
        acpi_ghes_add_fw_cfg(&acpi_ged_state->ghes_state,
                             vms->fw_cfg, tables.hardware_errors);
    }

    build_state->rsdp_mr = acpi_add_rom_blob(virt_acpi_build_update,
                                             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);
}