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/dmi.h>
   7 #include <linux/init.h>
   8 #include <linux/ioport.h>
   9 #include <linux/export.h>
  10 #include <linux/pci.h>
  11
  12 #include <asm/acpi.h>
  13 #include <asm/bios_ebda.h>
  14 #include <asm/paravirt.h>
  15 #include <asm/pci_x86.h>
  16 #include <asm/mpspec.h>
  17 #include <asm/setup.h>
  18 #include <asm/apic.h>
  19 #include <asm/e820/api.h>
  20 #include <asm/time.h>
  21 #include <asm/irq.h>
  22 #include <asm/io_apic.h>
  23 #include <asm/hpet.h>
  24 #include <asm/memtype.h>
  25 #include <asm/tsc.h>
  26 #include <asm/iommu.h>
  27 #include <asm/mach_traps.h>
  28 #include <asm/irqdomain.h>
  29 #include <asm/realmode.h>
  30
  31 void x86_init_noop(void) { }
  32 void __init x86_init_uint_noop(unsigned int unused) { }
  33 static int __init iommu_init_noop(void) { return 0; }
  34 static void iommu_shutdown_noop(void) { }
  35 bool __init bool_x86_init_noop(void) { return false; }
  36 void x86_op_int_noop(int cpu) { }
  37 static int set_rtc_noop(const struct timespec64 *now) { return -EINVAL; }
  38 static void get_rtc_noop(struct timespec64 *now) { }
  39
  40 static __initconst const struct of_device_id of_cmos_match[] = {
  41         { .compatible = "motorola,mc146818" },
  42         {}
  43 };
  44
  45 /*
  46  * Allow devicetree configured systems to disable the RTC by setting the
  47  * corresponding DT node's status property to disabled. Code is optimized
  48  * out for CONFIG_OF=n builds.
  49  */
  50 static __init void x86_wallclock_init(void)
  51 {
  52         struct device_node *node = of_find_matching_node(NULL, of_cmos_match);
  53
  54         if (node && !of_device_is_available(node)) {
  55                 x86_platform.get_wallclock = get_rtc_noop;
  56                 x86_platform.set_wallclock = set_rtc_noop;
  57         }
  58 }
  59
  60 /*
  61  * The platform setup functions are preset with the default functions
  62  * for standard PC hardware.
  63  */
  64 struct x86_init_ops x86_init __initdata = {
  65
  66         .resources = {
  67                 .probe_roms             = probe_roms,
  68                 .reserve_resources      = reserve_standard_io_resources,
  69                 .memory_setup           = e820__memory_setup_default,
  70                 .dmi_setup              = dmi_setup,
  71         },
  72
  73         .mpparse = {
  74                 .setup_ioapic_ids       = x86_init_noop,
  75                 .find_smp_config        = default_find_smp_config,
  76                 .get_smp_config         = default_get_smp_config,
  77         },
  78
  79         .irqs = {
  80                 .pre_vector_init        = init_ISA_irqs,
  81                 .intr_init              = native_init_IRQ,
  82                 .intr_mode_select       = apic_intr_mode_select,
  83                 .intr_mode_init         = apic_intr_mode_init,
  84                 .create_pci_msi_domain  = native_create_pci_msi_domain,
  85         },
  86
  87         .oem = {
  88                 .arch_setup             = x86_init_noop,
  89                 .banner                 = default_banner,
  90         },
  91
  92         .paging = {
  93                 .pagetable_init         = native_pagetable_init,
  94         },
  95
  96         .timers = {
  97                 .setup_percpu_clockev   = setup_boot_APIC_clock,
  98                 .timer_init             = hpet_time_init,
  99                 .wallclock_init         = x86_wallclock_init,
 100         },
 101
 102         .iommu = {
 103                 .iommu_init             = iommu_init_noop,
 104         },
 105
 106         .pci = {
 107                 .init                   = x86_default_pci_init,
 108                 .init_irq               = x86_default_pci_init_irq,
 109                 .fixup_irqs             = x86_default_pci_fixup_irqs,
 110         },
 111
 112         .hyper = {
 113                 .init_platform          = x86_init_noop,
 114                 .guest_late_init        = x86_init_noop,
 115                 .x2apic_available       = bool_x86_init_noop,
 116                 .msi_ext_dest_id        = bool_x86_init_noop,
 117                 .init_mem_mapping       = x86_init_noop,
 118                 .init_after_bootmem     = x86_init_noop,
 119         },
 120
 121         .acpi = {
 122                 .set_root_pointer       = x86_default_set_root_pointer,
 123                 .get_root_pointer       = x86_default_get_root_pointer,
 124                 .reduced_hw_early_init  = acpi_generic_reduced_hw_init,
 125         },
 126 };
 127
 128 struct x86_cpuinit_ops x86_cpuinit = {
 129         .early_percpu_clock_init        = x86_init_noop,
 130         .setup_percpu_clockev           = setup_secondary_APIC_clock,
 131 };
 132
 133 static void default_nmi_init(void) { };
 134
 135 static bool enc_status_change_prepare_noop(unsigned long vaddr, int npages, bool enc) { return true; }
 136 static bool enc_status_change_finish_noop(unsigned long vaddr, int npages, bool enc) { return false; }
 137 static bool enc_tlb_flush_required_noop(bool enc) { return false; }
 138 static bool enc_cache_flush_required_noop(void) { return false; }
 139
 140 struct x86_platform_ops x86_platform __ro_after_init = {
 141         .calibrate_cpu                  = native_calibrate_cpu_early,
 142         .calibrate_tsc                  = native_calibrate_tsc,
 143         .get_wallclock                  = mach_get_cmos_time,
 144         .set_wallclock                  = mach_set_cmos_time,
 145         .iommu_shutdown                 = iommu_shutdown_noop,
 146         .is_untracked_pat_range         = is_ISA_range,
 147         .nmi_init                       = default_nmi_init,
 148         .get_nmi_reason                 = default_get_nmi_reason,
 149         .save_sched_clock_state         = tsc_save_sched_clock_state,
 150         .restore_sched_clock_state      = tsc_restore_sched_clock_state,
 151         .realmode_reserve               = reserve_real_mode,
 152         .realmode_init                  = init_real_mode,
 153         .hyper.pin_vcpu                 = x86_op_int_noop,
 154
 155         .guest = {
 156                 .enc_status_change_prepare = enc_status_change_prepare_noop,
 157                 .enc_status_change_finish  = enc_status_change_finish_noop,
 158                 .enc_tlb_flush_required    = enc_tlb_flush_required_noop,
 159                 .enc_cache_flush_required  = enc_cache_flush_required_noop,
 160         },
 161 };
 162
 163 EXPORT_SYMBOL_GPL(x86_platform);
 164
 165 struct x86_apic_ops x86_apic_ops __ro_after_init = {
 166         .io_apic_read   = native_io_apic_read,
 167         .restore        = native_restore_boot_irq_mode,
 168 };