2 * Copyright (C) 2009 Thomas Gleixner <tglx@linutronix.de>
4 * For licencing details see kernel-base/COPYING
6 #include <linux/init.h>
7 #include <linux/ioport.h>
8 #include <linux/export.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>
18 #include <asm/e820/api.h>
21 #include <asm/io_apic.h>
23 #include <asm/memtype.h>
25 #include <asm/iommu.h>
26 #include <asm/mach_traps.h>
28 void x86_init_noop(void) { }
29 void __init x86_init_uint_noop(unsigned int unused) { }
30 static int __init iommu_init_noop(void) { return 0; }
31 static void iommu_shutdown_noop(void) { }
32 bool __init bool_x86_init_noop(void) { return false; }
33 void x86_op_int_noop(int cpu) { }
34 static __init int set_rtc_noop(const struct timespec64 *now) { return -EINVAL; }
35 static __init void get_rtc_noop(struct timespec64 *now) { }
37 static __initconst const struct of_device_id of_cmos_match[] = {
38 { .compatible = "motorola,mc146818" },
43 * Allow devicetree configured systems to disable the RTC by setting the
44 * corresponding DT node's status property to disabled. Code is optimized
45 * out for CONFIG_OF=n builds.
47 static __init void x86_wallclock_init(void)
49 struct device_node *node = of_find_matching_node(NULL, of_cmos_match);
51 if (node && !of_device_is_available(node)) {
52 x86_platform.get_wallclock = get_rtc_noop;
53 x86_platform.set_wallclock = set_rtc_noop;
58 * The platform setup functions are preset with the default functions
59 * for standard PC hardware.
61 struct x86_init_ops x86_init __initdata = {
64 .probe_roms = probe_roms,
65 .reserve_resources = reserve_standard_io_resources,
66 .memory_setup = e820__memory_setup_default,
70 .mpc_record = x86_init_uint_noop,
71 .setup_ioapic_ids = x86_init_noop,
72 .mpc_apic_id = default_mpc_apic_id,
73 .smp_read_mpc_oem = default_smp_read_mpc_oem,
74 .mpc_oem_bus_info = default_mpc_oem_bus_info,
75 .find_smp_config = default_find_smp_config,
76 .get_smp_config = default_get_smp_config,
80 .pre_vector_init = init_ISA_irqs,
81 .intr_init = native_init_IRQ,
82 .trap_init = x86_init_noop,
83 .intr_mode_select = apic_intr_mode_select,
84 .intr_mode_init = apic_intr_mode_init
88 .arch_setup = x86_init_noop,
89 .banner = default_banner,
93 .pagetable_init = native_pagetable_init,
97 .setup_percpu_clockev = setup_boot_APIC_clock,
98 .timer_init = hpet_time_init,
99 .wallclock_init = x86_wallclock_init,
103 .iommu_init = iommu_init_noop,
107 .init = x86_default_pci_init,
108 .init_irq = x86_default_pci_init_irq,
109 .fixup_irqs = x86_default_pci_fixup_irqs,
113 .init_platform = x86_init_noop,
114 .guest_late_init = x86_init_noop,
115 .x2apic_available = bool_x86_init_noop,
116 .init_mem_mapping = x86_init_noop,
117 .init_after_bootmem = x86_init_noop,
121 .set_root_pointer = x86_default_set_root_pointer,
122 .get_root_pointer = x86_default_get_root_pointer,
123 .reduced_hw_early_init = acpi_generic_reduced_hw_init,
127 struct x86_cpuinit_ops x86_cpuinit = {
128 .early_percpu_clock_init = x86_init_noop,
129 .setup_percpu_clockev = setup_secondary_APIC_clock,
132 static void default_nmi_init(void) { };
134 struct x86_platform_ops x86_platform __ro_after_init = {
135 .calibrate_cpu = native_calibrate_cpu_early,
136 .calibrate_tsc = native_calibrate_tsc,
137 .get_wallclock = mach_get_cmos_time,
138 .set_wallclock = mach_set_rtc_mmss,
139 .iommu_shutdown = iommu_shutdown_noop,
140 .is_untracked_pat_range = is_ISA_range,
141 .nmi_init = default_nmi_init,
142 .get_nmi_reason = default_get_nmi_reason,
143 .save_sched_clock_state = tsc_save_sched_clock_state,
144 .restore_sched_clock_state = tsc_restore_sched_clock_state,
145 .hyper.pin_vcpu = x86_op_int_noop,
148 EXPORT_SYMBOL_GPL(x86_platform);
150 #if defined(CONFIG_PCI_MSI)
151 struct x86_msi_ops x86_msi __ro_after_init = {
152 .setup_msi_irqs = native_setup_msi_irqs,
153 .teardown_msi_irq = native_teardown_msi_irq,
154 .teardown_msi_irqs = default_teardown_msi_irqs,
155 .restore_msi_irqs = default_restore_msi_irqs,
158 /* MSI arch specific hooks */
159 int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
161 return x86_msi.setup_msi_irqs(dev, nvec, type);
164 void arch_teardown_msi_irqs(struct pci_dev *dev)
166 x86_msi.teardown_msi_irqs(dev);
169 void arch_teardown_msi_irq(unsigned int irq)
171 x86_msi.teardown_msi_irq(irq);
174 void arch_restore_msi_irqs(struct pci_dev *dev)
176 x86_msi.restore_msi_irqs(dev);
180 struct x86_apic_ops x86_apic_ops __ro_after_init = {
181 .io_apic_read = native_io_apic_read,
182 .restore = native_restore_boot_irq_mode,