LXR linux/arch/x86/kernel/x86

   1/*
   2 * Copyright (C) 2009 Thomas Gleixner <tglx@linutronix.de>
   3 *
   4 *  For licencing details see kernel-base/COPYING
   5 */
   6#include <linux/init.h>
   7#include <linux/ioport.h>
   8#include <linux/export.h>
   9#include <linux/pci.h>
  10
  11#include <asm/acpi.h>
  12#include <asm/bios_ebda.h>
  13#include <asm/paravirt.h>
  14#include <asm/pci_x86.h>
  15#include <asm/mpspec.h>
  16#include <asm/setup.h>
  17#include <asm/apic.h>
  18#include <asm/e820/api.h>
  19#include <asm/time.h>
  20#include <asm/irq.h>
  21#include <asm/io_apic.h>
  22#include <asm/hpet.h>
  23#include <asm/memtype.h>
  24#include <asm/tsc.h>
  25#include <asm/iommu.h>
  26#include <asm/mach_traps.h>
  27#include <asm/irqdomain.h>
  28
  29void x86_init_noop(void) { }
  30void __init x86_init_uint_noop(unsigned int unused) { }
  31static int __init iommu_init_noop(void) { return 0; }
  32static void iommu_shutdown_noop(void) { }
  33bool __init bool_x86_init_noop(void) { return false; }
  34void x86_op_int_noop(int cpu) { }
  35static __init int set_rtc_noop(const struct timespec64 *now) { return -EINVAL; }
  36static __init void get_rtc_noop(struct timespec64 *now) { }
  37
  38static __initconst const struct of_device_id of_cmos_match[] = {
  39        { .compatible = "motorola,mc146818" },
  40        {}
  41};
  42
  43/*
  44 * Allow devicetree configured systems to disable the RTC by setting the
  45 * corresponding DT node's status property to disabled. Code is optimized
  46 * out for CONFIG_OF=n builds.
  47 */
  48static __init void x86_wallclock_init(void)
  49{
  50        struct device_node *node = of_find_matching_node(NULL, of_cmos_match);
  51
  52        if (node && !of_device_is_available(node)) {
  53                x86_platform.get_wallclock = get_rtc_noop;
  54                x86_platform.set_wallclock = set_rtc_noop;
  55        }
  56}
  57
  58/*
  59 * The platform setup functions are preset with the default functions
  60 * for standard PC hardware.
  61 */
  62struct x86_init_ops x86_init __initdata = {
  63
  64        .resources = {
  65                .probe_roms             = probe_roms,
  66                .reserve_resources      = reserve_standard_io_resources,
  67                .memory_setup           = e820__memory_setup_default,
  68        },
  69
  70        .mpparse = {
  71                .setup_ioapic_ids       = x86_init_noop,
  72                .find_smp_config        = default_find_smp_config,
  73                .get_smp_config         = default_get_smp_config,
  74        },
  75
  76        .irqs = {
  77                .pre_vector_init        = init_ISA_irqs,
  78                .intr_init              = native_init_IRQ,
  79                .intr_mode_select       = apic_intr_mode_select,
  80                .intr_mode_init         = apic_intr_mode_init,
  81                .create_pci_msi_domain  = native_create_pci_msi_domain,
  82        },
  83
  84        .oem = {
  85                .arch_setup             = x86_init_noop,
  86                .banner                 = default_banner,
  87        },
  88
  89        .paging = {
  90                .pagetable_init         = native_pagetable_init,
  91        },
  92
  93        .timers = {
  94                .setup_percpu_clockev   = setup_boot_APIC_clock,
  95                .timer_init             = hpet_time_init,
  96                .wallclock_init         = x86_wallclock_init,
  97        },
  98
  99        .iommu = {
 100                .iommu_init             = iommu_init_noop,
 101        },
 102
 103        .pci = {
 104                .init                   = x86_default_pci_init,
 105                .init_irq               = x86_default_pci_init_irq,
 106                .fixup_irqs             = x86_default_pci_fixup_irqs,
 107        },
 108
 109        .hyper = {
 110                .init_platform          = x86_init_noop,
 111                .guest_late_init        = x86_init_noop,
 112                .x2apic_available       = bool_x86_init_noop,
 113                .msi_ext_dest_id        = bool_x86_init_noop,
 114                .init_mem_mapping       = x86_init_noop,
 115                .init_after_bootmem     = x86_init_noop,
 116        },
 117
 118        .acpi = {
 119                .set_root_pointer       = x86_default_set_root_pointer,
 120                .get_root_pointer       = x86_default_get_root_pointer,
 121                .reduced_hw_early_init  = acpi_generic_reduced_hw_init,
 122        },
 123};
 124
 125struct x86_cpuinit_ops x86_cpuinit = {
 126        .early_percpu_clock_init        = x86_init_noop,
 127        .setup_percpu_clockev           = setup_secondary_APIC_clock,
 128};
 129
 130static void default_nmi_init(void) { };
 131
 132struct x86_platform_ops x86_platform __ro_after_init = {
 133        .calibrate_cpu                  = native_calibrate_cpu_early,
 134        .calibrate_tsc                  = native_calibrate_tsc,
 135        .get_wallclock                  = mach_get_cmos_time,
 136        .set_wallclock                  = mach_set_rtc_mmss,
 137        .iommu_shutdown                 = iommu_shutdown_noop,
 138        .is_untracked_pat_range         = is_ISA_range,
 139        .nmi_init                       = default_nmi_init,
 140        .get_nmi_reason                 = default_get_nmi_reason,
 141        .save_sched_clock_state         = tsc_save_sched_clock_state,
 142        .restore_sched_clock_state      = tsc_restore_sched_clock_state,
 143        .hyper.pin_vcpu                 = x86_op_int_noop,
 144};
 145
 146EXPORT_SYMBOL_GPL(x86_platform);
 147
 148#if defined(CONFIG_PCI_MSI)
 149struct x86_msi_ops x86_msi __ro_after_init = {
 150        .restore_msi_irqs       = default_restore_msi_irqs,
 151};
 152
 153/* MSI arch specific hooks */
 154void arch_restore_msi_irqs(struct pci_dev *dev)
 155{
 156        x86_msi.restore_msi_irqs(dev);
 157}
 158#endif
 159
 160struct x86_apic_ops x86_apic_ops __ro_after_init = {
 161        .io_apic_read   = native_io_apic_read,
 162        .restore        = native_restore_boot_irq_mode,
 163};
 164