arch/x86/kernel/x86_init.c

   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
  29 void x86_init_noop(void) { }
  30 void __init x86_init_uint_noop(unsigned int unused) { }
  31 static int __init iommu_init_noop(void) { return 0; }
  32 static void iommu_shutdown_noop(void) { }
  33 bool __init bool_x86_init_noop(void) { return false; }
  34 void x86_op_int_noop(int cpu) { }
  35 static __init int set_rtc_noop(const struct timespec64 *now) { return -EINVAL; }
  36 static __init void get_rtc_noop(struct timespec64 *now) { }
  37
  38 static __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  */
  48 static __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  */
  62 struct 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
 125 struct x86_cpuinit_ops x86_cpuinit = {
 126         .early_percpu_clock_init        = x86_init_noop,
 127         .setup_percpu_clockev           = setup_secondary_APIC_clock,
 128 };
 129
 130 static void default_nmi_init(void) { };
 131
 132 struct 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
 146 EXPORT_SYMBOL_GPL(x86_platform);
 147
 148 #if defined(CONFIG_PCI_MSI)
 149 struct x86_msi_ops x86_msi __ro_after_init = {
 150         .restore_msi_irqs       = default_restore_msi_irqs,
 151 };
 152
 153 /* MSI arch specific hooks */
 154 void arch_restore_msi_irqs(struct pci_dev *dev)
 155 {
 156         x86_msi.restore_msi_irqs(dev);
 157 }
 158 #endif
 159
 160 struct 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 };