xref: /openbmc/linux/arch/x86/kernel/x86_init.c (revision 20e8ef5c) 
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 struct x86_apic_ops x86_apic_ops __ro_after_init = {
149 	.io_apic_read	= native_io_apic_read,
150 	.restore	= native_restore_boot_irq_mode,
151 };
152