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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_PLATFORM_H
#define _ASM_X86_PLATFORM_H
#include <asm/bootparam.h>
struct mpc_bus;
struct mpc_cpu;
struct mpc_table;
struct cpuinfo_x86;
* struct x86_init_mpparse - platform specific mpparse ops
* @mpc_record: platform specific mpc record accounting
* @setup_ioapic_ids: platform specific ioapic id override
* @mpc_apic_id: platform specific mpc apic id assignment
* @smp_read_mpc_oem: platform specific oem mpc table setup
* @mpc_oem_pci_bus: platform specific pci bus setup (default NULL)
* @mpc_oem_bus_info: platform specific mpc bus info
* @find_smp_config: find the smp configuration
* @get_smp_config: get the smp configuration
struct x86_init_mpparse {
void (*mpc_record)(unsigned int mode);
void (*setup_ioapic_ids)(void);
int (*mpc_apic_id)(struct mpc_cpu *m);
void (*smp_read_mpc_oem)(struct mpc_table *mpc);
void (*mpc_oem_pci_bus)(struct mpc_bus *m);
void (*mpc_oem_bus_info)(struct mpc_bus *m, char *name);
void (*find_smp_config)(void);
void (*get_smp_config)(unsigned int early);
* struct x86_init_resources - platform specific resource related ops
* @probe_roms: probe BIOS roms
* @reserve_resources: reserve the standard resources for the
* platform
* @memory_setup: platform specific memory setup
struct x86_init_resources {
void (*probe_roms)(void);
void (*reserve_resources)(void);
char *(*memory_setup)(void);
* struct x86_init_irqs - platform specific interrupt setup
* @pre_vector_init: init code to run before interrupt vectors
* are set up.
* @intr_init: interrupt init code
* @trap_init: platform specific trap setup
* @intr_mode_init: interrupt delivery mode setup
struct x86_init_irqs {
void (*pre_vector_init)(void);
void (*intr_init)(void);
void (*trap_init)(void);
void (*intr_mode_init)(void);
* struct x86_init_oem - oem platform specific customizing functions
* @arch_setup: platform specific architecture setup
* @banner: print a platform specific banner
struct x86_init_oem {
void (*arch_setup)(void);
void (*banner)(void);
* struct x86_init_paging - platform specific paging functions
* @pagetable_init: platform specific paging initialization call to setup
* the kernel pagetables and prepare accessors functions.
* Callback must call paging_init(). Called once after the
* direct mapping for phys memory is available.
struct x86_init_paging {
void (*pagetable_init)(void);
* struct x86_init_timers - platform specific timer setup
* @setup_perpcu_clockev: set up the per cpu clock event device for the
* boot cpu
* @timer_init: initialize the platform timer (default PIT/HPET)
* @wallclock_init: init the wallclock device
struct x86_init_timers {
void (*setup_percpu_clockev)(void);
void (*timer_init)(void);
void (*wallclock_init)(void);
* struct x86_init_iommu - platform specific iommu setup
* @iommu_init: platform specific iommu setup
struct x86_init_iommu {
int (*iommu_init)(void);
* struct x86_init_pci - platform specific pci init functions
* @arch_init: platform specific pci arch init call
* @init: platform specific pci subsystem init
* @init_irq: platform specific pci irq init
* @fixup_irqs: platform specific pci irq fixup
struct x86_init_pci {
int (*arch_init)(void);
int (*init)(void);
void (*init_irq)(void);
void (*fixup_irqs)(void);
* struct x86_hyper_init - x86 hypervisor init functions
* @init_platform: platform setup
* @guest_late_init: guest late init
* @x2apic_available: X2APIC detection
* @init_mem_mapping: setup early mappings during init_mem_mapping()
* @init_after_bootmem: guest init after boot allocator is finished
struct x86_hyper_init {
void (*init_platform)(void);
void (*guest_late_init)(void);
bool (*x2apic_available)(void);
void (*init_mem_mapping)(void);
void (*init_after_bootmem)(void);
* struct x86_init_acpi - x86 ACPI init functions
* @get_root_pointer: get RSDP address
* @reduced_hw_early_init: hardware reduced platform early init
struct x86_init_acpi {
u64 (*get_root_pointer)(void);
void (*reduced_hw_early_init)(void);
* struct x86_init_ops - functions for platform specific setup
struct x86_init_ops {
struct x86_init_resources resources;
struct x86_init_mpparse mpparse;
struct x86_init_irqs irqs;
struct x86_init_oem oem;
struct x86_init_paging paging;
struct x86_init_timers timers;
struct x86_init_iommu iommu;
struct x86_init_pci pci;
struct x86_hyper_init hyper;
struct x86_init_acpi acpi;
* struct x86_cpuinit_ops - platform specific cpu hotplug setups
* @setup_percpu_clockev: set up the per cpu clock event device
* @early_percpu_clock_init: early init of the per cpu clock event device
struct x86_cpuinit_ops {
void (*setup_percpu_clockev)(void);
void (*early_percpu_clock_init)(void);
void (*fixup_cpu_id)(struct cpuinfo_x86 *c, int node);
struct timespec64;
* struct x86_legacy_devices - legacy x86 devices
* @pnpbios: this platform can have a PNPBIOS. If this is disabled the platform
* is known to never have a PNPBIOS.
* These are devices known to require LPC or ISA bus. The definition of legacy
* devices adheres to the ACPI IA-PC Boot Architecture flag
* ACPI_FADT_LEGACY_DEVICES. These devices consist of user visible devices on
* the LPC or ISA bus. User visible devices are devices that have end-user
* accessible connectors (for example, LPT parallel port). Legacy devices on
* the LPC bus consist for example of serial and parallel ports, PS/2 keyboard
* / mouse, and the floppy disk controller. A system that lacks all known
* legacy devices can assume all devices can be detected exclusively via
* standard device enumeration mechanisms including the ACPI namespace.
* A system which has does not have ACPI_FADT_LEGACY_DEVICES enabled must not
* have any of the legacy devices enumerated below present.
struct x86_legacy_devices {
int pnpbios;
* enum x86_legacy_i8042_state - i8042 keyboard controller state
* @X86_LEGACY_I8042_PLATFORM_ABSENT: the controller is always absent on
* given platform/subarch.
* @X86_LEGACY_I8042_FIRMWARE_ABSENT: firmware reports that the controller
* is absent.
* @X86_LEGACY_i8042_EXPECTED_PRESENT: the controller is likely to be
* present, the i8042 driver should probe for controller existence.
enum x86_legacy_i8042_state {
* struct x86_legacy_features - legacy x86 features
* @i8042: indicated if we expect the device to have i8042 controller
* present.
* @rtc: this device has a CMOS real-time clock present
* @reserve_bios_regions: boot code will search for the EBDA address and the
* start of the 640k - 1M BIOS region. If false, the platform must
* ensure that its memory map correctly reserves sub-1MB regions as needed.
* @devices: legacy x86 devices, refer to struct x86_legacy_devices
* documentation for further details.
struct x86_legacy_features {
enum x86_legacy_i8042_state i8042;
int rtc;
int warm_reset;
int no_vga;
int reserve_bios_regions;
struct x86_legacy_devices devices;
* struct x86_hyper_runtime - x86 hypervisor specific runtime callbacks
* @pin_vcpu: pin current vcpu to specified physical cpu (run rarely)
struct x86_hyper_runtime {
void (*pin_vcpu)(int cpu);
* struct x86_platform_ops - platform specific runtime functions
* @calibrate_cpu: calibrate CPU
* @calibrate_tsc: calibrate TSC, if different from CPU
* @get_wallclock: get time from HW clock like RTC etc.
* @set_wallclock: set time back to HW clock
* @is_untracked_pat_range exclude from PAT logic
* @nmi_init enable NMI on cpus
* @save_sched_clock_state: save state for sched_clock() on suspend
* @restore_sched_clock_state: restore state for sched_clock() on resume
* @apic_post_init: adjust apic if needed
* @legacy: legacy features
* @set_legacy_features: override legacy features. Use of this callback
* is highly discouraged. You should only need
* this if your hardware platform requires further
* custom fine tuning far beyond what may be
* possible in x86_early_init_platform_quirks() by
* only using the current x86_hardware_subarch
* semantics.
* @hyper: x86 hypervisor specific runtime callbacks
struct x86_platform_ops {
unsigned long (*calibrate_cpu)(void);
unsigned long (*calibrate_tsc)(void);
void (*get_wallclock)(struct timespec64 *ts);
int (*set_wallclock)(const struct timespec64 *ts);
void (*iommu_shutdown)(void);
bool (*is_untracked_pat_range)(u64 start, u64 end);
void (*nmi_init)(void);
unsigned char (*get_nmi_reason)(void);
void (*save_sched_clock_state)(void);
void (*restore_sched_clock_state)(void);
void (*apic_post_init)(void);
struct x86_legacy_features legacy;
void (*set_legacy_features)(void);
struct x86_hyper_runtime hyper;
struct pci_dev;
struct x86_msi_ops {
int (*setup_msi_irqs)(struct pci_dev *dev, int nvec, int type);
void (*teardown_msi_irq)(unsigned int irq);
void (*teardown_msi_irqs)(struct pci_dev *dev);
void (*restore_msi_irqs)(struct pci_dev *dev);
struct x86_apic_ops {
unsigned int (*io_apic_read) (unsigned int apic, unsigned int reg);
void (*restore)(void);
extern struct x86_init_ops x86_init;
extern struct x86_cpuinit_ops x86_cpuinit;
extern struct x86_platform_ops x86_platform;
extern struct x86_msi_ops x86_msi;
extern struct x86_apic_ops x86_apic_ops;
extern void x86_early_init_platform_quirks(void);
extern void x86_init_noop(void);
extern void x86_init_uint_noop(unsigned int unused);
extern bool x86_pnpbios_disabled(void);