xref: /linux/arch/x86/kernel/x86_init.c (revision 3ea5eb68b9d624935108b5e696859304edfac202)
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 #include <linux/acpi.h>
12 
13 #include <asm/acpi.h>
14 #include <asm/bios_ebda.h>
15 #include <asm/paravirt.h>
16 #include <asm/pci_x86.h>
17 #include <asm/mpspec.h>
18 #include <asm/setup.h>
19 #include <asm/apic.h>
20 #include <asm/e820/api.h>
21 #include <asm/time.h>
22 #include <asm/irq.h>
23 #include <asm/io_apic.h>
24 #include <asm/hpet.h>
25 #include <asm/memtype.h>
26 #include <asm/tsc.h>
27 #include <asm/iommu.h>
28 #include <asm/mach_traps.h>
29 #include <asm/irqdomain.h>
30 #include <asm/realmode.h>
31 
32 void x86_init_noop(void) { }
33 void __init x86_init_uint_noop(unsigned int unused) { }
34 static int __init iommu_init_noop(void) { return 0; }
35 static void iommu_shutdown_noop(void) { }
36 bool __init bool_x86_init_noop(void) { return false; }
37 void x86_op_int_noop(int cpu) { }
38 int set_rtc_noop(const struct timespec64 *now) { return -EINVAL; }
39 void get_rtc_noop(struct timespec64 *now) { }
40 
41 static __initconst const struct of_device_id of_cmos_match[] = {
42 	{ .compatible = "motorola,mc146818" },
43 	{}
44 };
45 
46 /*
47  * Allow devicetree configured systems to disable the RTC by setting the
48  * corresponding DT node's status property to disabled. Code is optimized
49  * out for CONFIG_OF=n builds.
50  */
51 static __init void x86_wallclock_init(void)
52 {
53 	struct device_node *node = of_find_matching_node(NULL, of_cmos_match);
54 
55 	if (node && !of_device_is_available(node)) {
56 		x86_platform.get_wallclock = get_rtc_noop;
57 		x86_platform.set_wallclock = set_rtc_noop;
58 	}
59 }
60 
61 /*
62  * The platform setup functions are preset with the default functions
63  * for standard PC hardware.
64  */
65 struct x86_init_ops x86_init __initdata = {
66 
67 	.resources = {
68 		.probe_roms		= probe_roms,
69 		.reserve_resources	= reserve_standard_io_resources,
70 		.memory_setup		= e820__memory_setup_default,
71 		.dmi_setup		= dmi_setup,
72 	},
73 
74 	.mpparse = {
75 		.setup_ioapic_ids	= x86_init_noop,
76 		.find_mptable		= mpparse_find_mptable,
77 		.early_parse_smp_cfg	= mpparse_parse_early_smp_config,
78 		.parse_smp_cfg		= mpparse_parse_smp_config,
79 	},
80 
81 	.irqs = {
82 		.pre_vector_init	= init_ISA_irqs,
83 		.intr_init		= native_init_IRQ,
84 		.intr_mode_select	= apic_intr_mode_select,
85 		.intr_mode_init		= apic_intr_mode_init,
86 		.create_pci_msi_domain	= native_create_pci_msi_domain,
87 	},
88 
89 	.oem = {
90 		.arch_setup		= x86_init_noop,
91 		.banner			= default_banner,
92 	},
93 
94 	.paging = {
95 		.pagetable_init		= native_pagetable_init,
96 	},
97 
98 	.timers = {
99 		.setup_percpu_clockev	= setup_boot_APIC_clock,
100 		.timer_init		= hpet_time_init,
101 		.wallclock_init		= x86_wallclock_init,
102 	},
103 
104 	.iommu = {
105 		.iommu_init		= iommu_init_noop,
106 	},
107 
108 	.pci = {
109 		.init			= x86_default_pci_init,
110 		.init_irq		= x86_default_pci_init_irq,
111 		.fixup_irqs		= x86_default_pci_fixup_irqs,
112 	},
113 
114 	.hyper = {
115 		.init_platform		= x86_init_noop,
116 		.guest_late_init	= x86_init_noop,
117 		.x2apic_available	= bool_x86_init_noop,
118 		.msi_ext_dest_id	= bool_x86_init_noop,
119 		.init_mem_mapping	= x86_init_noop,
120 		.init_after_bootmem	= x86_init_noop,
121 	},
122 
123 	.acpi = {
124 		.set_root_pointer	= x86_default_set_root_pointer,
125 		.get_root_pointer	= x86_default_get_root_pointer,
126 		.reduced_hw_early_init	= acpi_generic_reduced_hw_init,
127 	},
128 };
129 
130 struct x86_cpuinit_ops x86_cpuinit = {
131 	.early_percpu_clock_init	= x86_init_noop,
132 	.setup_percpu_clockev		= setup_secondary_APIC_clock,
133 	.parallel_bringup		= true,
134 };
135 
136 static void default_nmi_init(void) { };
137 
138 static int enc_status_change_prepare_noop(unsigned long vaddr, int npages, bool enc) { return 0; }
139 static int enc_status_change_finish_noop(unsigned long vaddr, int npages, bool enc) { return 0; }
140 static bool enc_tlb_flush_required_noop(bool enc) { return false; }
141 static bool enc_cache_flush_required_noop(void) { return false; }
142 static void enc_kexec_begin_noop(void) {}
143 static void enc_kexec_finish_noop(void) {}
144 static bool is_private_mmio_noop(u64 addr) {return false; }
145 
146 struct x86_platform_ops x86_platform __ro_after_init = {
147 	.calibrate_cpu			= native_calibrate_cpu_early,
148 	.calibrate_tsc			= native_calibrate_tsc,
149 	.get_wallclock			= mach_get_cmos_time,
150 	.set_wallclock			= mach_set_cmos_time,
151 	.iommu_shutdown			= iommu_shutdown_noop,
152 	.is_untracked_pat_range		= is_ISA_range,
153 	.nmi_init			= default_nmi_init,
154 	.get_nmi_reason			= default_get_nmi_reason,
155 	.save_sched_clock_state		= tsc_save_sched_clock_state,
156 	.restore_sched_clock_state	= tsc_restore_sched_clock_state,
157 	.realmode_reserve		= reserve_real_mode,
158 	.realmode_init			= init_real_mode,
159 	.hyper.pin_vcpu			= x86_op_int_noop,
160 	.hyper.is_private_mmio		= is_private_mmio_noop,
161 
162 	.guest = {
163 		.enc_status_change_prepare = enc_status_change_prepare_noop,
164 		.enc_status_change_finish  = enc_status_change_finish_noop,
165 		.enc_tlb_flush_required	   = enc_tlb_flush_required_noop,
166 		.enc_cache_flush_required  = enc_cache_flush_required_noop,
167 		.enc_kexec_begin	   = enc_kexec_begin_noop,
168 		.enc_kexec_finish	   = enc_kexec_finish_noop,
169 	},
170 };
171 
172 EXPORT_SYMBOL_GPL(x86_platform);
173 
174 struct x86_apic_ops x86_apic_ops __ro_after_init = {
175 	.io_apic_read	= native_io_apic_read,
176 	.restore	= native_restore_boot_irq_mode,
177 };
178