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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Interrupt descriptor table related code
4 */
5#include <linux/interrupt.h>
6
7#include <asm/traps.h>
8#include <asm/proto.h>
9#include <asm/desc.h>
10#include <asm/hw_irq.h>
11
12struct idt_data {
13 unsigned int vector;
14 unsigned int segment;
15 struct idt_bits bits;
16 const void *addr;
17};
18
19#define DPL0 0x0
20#define DPL3 0x3
21
22#define DEFAULT_STACK 0
23
24#define G(_vector, _addr, _ist, _type, _dpl, _segment) \
25 { \
26 .vector = _vector, \
27 .bits.ist = _ist, \
28 .bits.type = _type, \
29 .bits.dpl = _dpl, \
30 .bits.p = 1, \
31 .addr = _addr, \
32 .segment = _segment, \
33 }
34
35/* Interrupt gate */
36#define INTG(_vector, _addr) \
37 G(_vector, _addr, DEFAULT_STACK, GATE_INTERRUPT, DPL0, __KERNEL_CS)
38
39/* System interrupt gate */
40#define SYSG(_vector, _addr) \
41 G(_vector, _addr, DEFAULT_STACK, GATE_INTERRUPT, DPL3, __KERNEL_CS)
42
43/*
44 * Interrupt gate with interrupt stack. The _ist index is the index in
45 * the tss.ist[] array, but for the descriptor it needs to start at 1.
46 */
47#define ISTG(_vector, _addr, _ist) \
48 G(_vector, _addr, _ist + 1, GATE_INTERRUPT, DPL0, __KERNEL_CS)
49
50/* Task gate */
51#define TSKG(_vector, _gdt) \
52 G(_vector, NULL, DEFAULT_STACK, GATE_TASK, DPL0, _gdt << 3)
53
54/*
55 * Early traps running on the DEFAULT_STACK because the other interrupt
56 * stacks work only after cpu_init().
57 */
58static const __initconst struct idt_data early_idts[] = {
59 INTG(X86_TRAP_DB, debug),
60 SYSG(X86_TRAP_BP, int3),
61#ifdef CONFIG_X86_32
62 INTG(X86_TRAP_PF, page_fault),
63#endif
64};
65
66/*
67 * The default IDT entries which are set up in trap_init() before
68 * cpu_init() is invoked. Interrupt stacks cannot be used at that point and
69 * the traps which use them are reinitialized with IST after cpu_init() has
70 * set up TSS.
71 */
72static const __initconst struct idt_data def_idts[] = {
73 INTG(X86_TRAP_DE, divide_error),
74 INTG(X86_TRAP_NMI, nmi),
75 INTG(X86_TRAP_BR, bounds),
76 INTG(X86_TRAP_UD, invalid_op),
77 INTG(X86_TRAP_NM, device_not_available),
78 INTG(X86_TRAP_OLD_MF, coprocessor_segment_overrun),
79 INTG(X86_TRAP_TS, invalid_TSS),
80 INTG(X86_TRAP_NP, segment_not_present),
81 INTG(X86_TRAP_SS, stack_segment),
82 INTG(X86_TRAP_GP, general_protection),
83 INTG(X86_TRAP_SPURIOUS, spurious_interrupt_bug),
84 INTG(X86_TRAP_MF, coprocessor_error),
85 INTG(X86_TRAP_AC, alignment_check),
86 INTG(X86_TRAP_XF, simd_coprocessor_error),
87
88#ifdef CONFIG_X86_32
89 TSKG(X86_TRAP_DF, GDT_ENTRY_DOUBLEFAULT_TSS),
90#else
91 INTG(X86_TRAP_DF, double_fault),
92#endif
93 INTG(X86_TRAP_DB, debug),
94
95#ifdef CONFIG_X86_MCE
96 INTG(X86_TRAP_MC, &machine_check),
97#endif
98
99 SYSG(X86_TRAP_OF, overflow),
100#if defined(CONFIG_IA32_EMULATION)
101 SYSG(IA32_SYSCALL_VECTOR, entry_INT80_compat),
102#elif defined(CONFIG_X86_32)
103 SYSG(IA32_SYSCALL_VECTOR, entry_INT80_32),
104#endif
105};
106
107/*
108 * The APIC and SMP idt entries
109 */
110static const __initconst struct idt_data apic_idts[] = {
111#ifdef CONFIG_SMP
112 INTG(RESCHEDULE_VECTOR, reschedule_interrupt),
113 INTG(CALL_FUNCTION_VECTOR, call_function_interrupt),
114 INTG(CALL_FUNCTION_SINGLE_VECTOR, call_function_single_interrupt),
115 INTG(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt),
116 INTG(REBOOT_VECTOR, reboot_interrupt),
117#endif
118
119#ifdef CONFIG_X86_THERMAL_VECTOR
120 INTG(THERMAL_APIC_VECTOR, thermal_interrupt),
121#endif
122
123#ifdef CONFIG_X86_MCE_THRESHOLD
124 INTG(THRESHOLD_APIC_VECTOR, threshold_interrupt),
125#endif
126
127#ifdef CONFIG_X86_MCE_AMD
128 INTG(DEFERRED_ERROR_VECTOR, deferred_error_interrupt),
129#endif
130
131#ifdef CONFIG_X86_LOCAL_APIC
132 INTG(LOCAL_TIMER_VECTOR, apic_timer_interrupt),
133 INTG(X86_PLATFORM_IPI_VECTOR, x86_platform_ipi),
134# ifdef CONFIG_HAVE_KVM
135 INTG(POSTED_INTR_VECTOR, kvm_posted_intr_ipi),
136 INTG(POSTED_INTR_WAKEUP_VECTOR, kvm_posted_intr_wakeup_ipi),
137 INTG(POSTED_INTR_NESTED_VECTOR, kvm_posted_intr_nested_ipi),
138# endif
139# ifdef CONFIG_IRQ_WORK
140 INTG(IRQ_WORK_VECTOR, irq_work_interrupt),
141# endif
142#ifdef CONFIG_X86_UV
143 INTG(UV_BAU_MESSAGE, uv_bau_message_intr1),
144#endif
145 INTG(SPURIOUS_APIC_VECTOR, spurious_interrupt),
146 INTG(ERROR_APIC_VECTOR, error_interrupt),
147#endif
148};
149
150#ifdef CONFIG_X86_64
151/*
152 * Early traps running on the DEFAULT_STACK because the other interrupt
153 * stacks work only after cpu_init().
154 */
155static const __initconst struct idt_data early_pf_idts[] = {
156 INTG(X86_TRAP_PF, page_fault),
157};
158
159/*
160 * Override for the debug_idt. Same as the default, but with interrupt
161 * stack set to DEFAULT_STACK (0). Required for NMI trap handling.
162 */
163static const __initconst struct idt_data dbg_idts[] = {
164 INTG(X86_TRAP_DB, debug),
165};
166#endif
167
168/* Must be page-aligned because the real IDT is used in a fixmap. */
169gate_desc idt_table[IDT_ENTRIES] __page_aligned_bss;
170
171struct desc_ptr idt_descr __ro_after_init = {
172 .size = (IDT_ENTRIES * 2 * sizeof(unsigned long)) - 1,
173 .address = (unsigned long) idt_table,
174};
175
176#ifdef CONFIG_X86_64
177/* No need to be aligned, but done to keep all IDTs defined the same way. */
178gate_desc debug_idt_table[IDT_ENTRIES] __page_aligned_bss;
179
180/*
181 * The exceptions which use Interrupt stacks. They are setup after
182 * cpu_init() when the TSS has been initialized.
183 */
184static const __initconst struct idt_data ist_idts[] = {
185 ISTG(X86_TRAP_DB, debug, IST_INDEX_DB),
186 ISTG(X86_TRAP_NMI, nmi, IST_INDEX_NMI),
187 ISTG(X86_TRAP_DF, double_fault, IST_INDEX_DF),
188#ifdef CONFIG_X86_MCE
189 ISTG(X86_TRAP_MC, &machine_check, IST_INDEX_MCE),
190#endif
191};
192
193/*
194 * Override for the debug_idt. Same as the default, but with interrupt
195 * stack set to DEFAULT_STACK (0). Required for NMI trap handling.
196 */
197const struct desc_ptr debug_idt_descr = {
198 .size = IDT_ENTRIES * 16 - 1,
199 .address = (unsigned long) debug_idt_table,
200};
201#endif
202
203static inline void idt_init_desc(gate_desc *gate, const struct idt_data *d)
204{
205 unsigned long addr = (unsigned long) d->addr;
206
207 gate->offset_low = (u16) addr;
208 gate->segment = (u16) d->segment;
209 gate->bits = d->bits;
210 gate->offset_middle = (u16) (addr >> 16);
211#ifdef CONFIG_X86_64
212 gate->offset_high = (u32) (addr >> 32);
213 gate->reserved = 0;
214#endif
215}
216
217static void
218idt_setup_from_table(gate_desc *idt, const struct idt_data *t, int size, bool sys)
219{
220 gate_desc desc;
221
222 for (; size > 0; t++, size--) {
223 idt_init_desc(&desc, t);
224 write_idt_entry(idt, t->vector, &desc);
225 if (sys)
226 set_bit(t->vector, system_vectors);
227 }
228}
229
230static void set_intr_gate(unsigned int n, const void *addr)
231{
232 struct idt_data data;
233
234 BUG_ON(n > 0xFF);
235
236 memset(&data, 0, sizeof(data));
237 data.vector = n;
238 data.addr = addr;
239 data.segment = __KERNEL_CS;
240 data.bits.type = GATE_INTERRUPT;
241 data.bits.p = 1;
242
243 idt_setup_from_table(idt_table, &data, 1, false);
244}
245
246/**
247 * idt_setup_early_traps - Initialize the idt table with early traps
248 *
249 * On X8664 these traps do not use interrupt stacks as they can't work
250 * before cpu_init() is invoked and sets up TSS. The IST variants are
251 * installed after that.
252 */
253void __init idt_setup_early_traps(void)
254{
255 idt_setup_from_table(idt_table, early_idts, ARRAY_SIZE(early_idts),
256 true);
257 load_idt(&idt_descr);
258}
259
260/**
261 * idt_setup_traps - Initialize the idt table with default traps
262 */
263void __init idt_setup_traps(void)
264{
265 idt_setup_from_table(idt_table, def_idts, ARRAY_SIZE(def_idts), true);
266}
267
268#ifdef CONFIG_X86_64
269/**
270 * idt_setup_early_pf - Initialize the idt table with early pagefault handler
271 *
272 * On X8664 this does not use interrupt stacks as they can't work before
273 * cpu_init() is invoked and sets up TSS. The IST variant is installed
274 * after that.
275 *
276 * FIXME: Why is 32bit and 64bit installing the PF handler at different
277 * places in the early setup code?
278 */
279void __init idt_setup_early_pf(void)
280{
281 idt_setup_from_table(idt_table, early_pf_idts,
282 ARRAY_SIZE(early_pf_idts), true);
283}
284
285/**
286 * idt_setup_ist_traps - Initialize the idt table with traps using IST
287 */
288void __init idt_setup_ist_traps(void)
289{
290 idt_setup_from_table(idt_table, ist_idts, ARRAY_SIZE(ist_idts), true);
291}
292
293/**
294 * idt_setup_debugidt_traps - Initialize the debug idt table with debug traps
295 */
296void __init idt_setup_debugidt_traps(void)
297{
298 memcpy(&debug_idt_table, &idt_table, IDT_ENTRIES * 16);
299
300 idt_setup_from_table(debug_idt_table, dbg_idts, ARRAY_SIZE(dbg_idts), false);
301}
302#endif
303
304/**
305 * idt_setup_apic_and_irq_gates - Setup APIC/SMP and normal interrupt gates
306 */
307void __init idt_setup_apic_and_irq_gates(void)
308{
309 int i = FIRST_EXTERNAL_VECTOR;
310 void *entry;
311
312 idt_setup_from_table(idt_table, apic_idts, ARRAY_SIZE(apic_idts), true);
313
314 for_each_clear_bit_from(i, system_vectors, FIRST_SYSTEM_VECTOR) {
315 entry = irq_entries_start + 8 * (i - FIRST_EXTERNAL_VECTOR);
316 set_intr_gate(i, entry);
317 }
318
319#ifdef CONFIG_X86_LOCAL_APIC
320 for_each_clear_bit_from(i, system_vectors, NR_VECTORS) {
321 set_bit(i, system_vectors);
322 entry = spurious_entries_start + 8 * (i - FIRST_SYSTEM_VECTOR);
323 set_intr_gate(i, entry);
324 }
325#endif
326}
327
328/**
329 * idt_setup_early_handler - Initializes the idt table with early handlers
330 */
331void __init idt_setup_early_handler(void)
332{
333 int i;
334
335 for (i = 0; i < NUM_EXCEPTION_VECTORS; i++)
336 set_intr_gate(i, early_idt_handler_array[i]);
337#ifdef CONFIG_X86_32
338 for ( ; i < NR_VECTORS; i++)
339 set_intr_gate(i, early_ignore_irq);
340#endif
341 load_idt(&idt_descr);
342}
343
344/**
345 * idt_invalidate - Invalidate interrupt descriptor table
346 * @addr: The virtual address of the 'invalid' IDT
347 */
348void idt_invalidate(void *addr)
349{
350 struct desc_ptr idt = { .address = (unsigned long) addr, .size = 0 };
351
352 load_idt(&idt);
353}
354
355void __init update_intr_gate(unsigned int n, const void *addr)
356{
357 if (WARN_ON_ONCE(!test_bit(n, system_vectors)))
358 return;
359 set_intr_gate(n, addr);
360}
361
362void alloc_intr_gate(unsigned int n, const void *addr)
363{
364 BUG_ON(n < FIRST_SYSTEM_VECTOR);
365 if (!test_and_set_bit(n, system_vectors))
366 set_intr_gate(n, addr);
367}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Interrupt descriptor table related code
4 */
5#include <linux/interrupt.h>
6
7#include <asm/cpu_entry_area.h>
8#include <asm/set_memory.h>
9#include <asm/traps.h>
10#include <asm/proto.h>
11#include <asm/desc.h>
12#include <asm/hw_irq.h>
13#include <asm/ia32.h>
14#include <asm/idtentry.h>
15
16#define DPL0 0x0
17#define DPL3 0x3
18
19#define DEFAULT_STACK 0
20
21#define G(_vector, _addr, _ist, _type, _dpl, _segment) \
22 { \
23 .vector = _vector, \
24 .bits.ist = _ist, \
25 .bits.type = _type, \
26 .bits.dpl = _dpl, \
27 .bits.p = 1, \
28 .addr = _addr, \
29 .segment = _segment, \
30 }
31
32/* Interrupt gate */
33#define INTG(_vector, _addr) \
34 G(_vector, _addr, DEFAULT_STACK, GATE_INTERRUPT, DPL0, __KERNEL_CS)
35
36/* System interrupt gate */
37#define SYSG(_vector, _addr) \
38 G(_vector, _addr, DEFAULT_STACK, GATE_INTERRUPT, DPL3, __KERNEL_CS)
39
40#ifdef CONFIG_X86_64
41/*
42 * Interrupt gate with interrupt stack. The _ist index is the index in
43 * the tss.ist[] array, but for the descriptor it needs to start at 1.
44 */
45#define ISTG(_vector, _addr, _ist) \
46 G(_vector, _addr, _ist + 1, GATE_INTERRUPT, DPL0, __KERNEL_CS)
47#else
48#define ISTG(_vector, _addr, _ist) INTG(_vector, _addr)
49#endif
50
51/* Task gate */
52#define TSKG(_vector, _gdt) \
53 G(_vector, NULL, DEFAULT_STACK, GATE_TASK, DPL0, _gdt << 3)
54
55#define IDT_TABLE_SIZE (IDT_ENTRIES * sizeof(gate_desc))
56
57static bool idt_setup_done __initdata;
58
59/*
60 * Early traps running on the DEFAULT_STACK because the other interrupt
61 * stacks work only after cpu_init().
62 */
63static const __initconst struct idt_data early_idts[] = {
64 INTG(X86_TRAP_DB, asm_exc_debug),
65 SYSG(X86_TRAP_BP, asm_exc_int3),
66
67#ifdef CONFIG_X86_32
68 /*
69 * Not possible on 64-bit. See idt_setup_early_pf() for details.
70 */
71 INTG(X86_TRAP_PF, asm_exc_page_fault),
72#endif
73#ifdef CONFIG_INTEL_TDX_GUEST
74 INTG(X86_TRAP_VE, asm_exc_virtualization_exception),
75#endif
76};
77
78/*
79 * The default IDT entries which are set up in trap_init() before
80 * cpu_init() is invoked. Interrupt stacks cannot be used at that point and
81 * the traps which use them are reinitialized with IST after cpu_init() has
82 * set up TSS.
83 */
84static const __initconst struct idt_data def_idts[] = {
85 INTG(X86_TRAP_DE, asm_exc_divide_error),
86 ISTG(X86_TRAP_NMI, asm_exc_nmi, IST_INDEX_NMI),
87 INTG(X86_TRAP_BR, asm_exc_bounds),
88 INTG(X86_TRAP_UD, asm_exc_invalid_op),
89 INTG(X86_TRAP_NM, asm_exc_device_not_available),
90 INTG(X86_TRAP_OLD_MF, asm_exc_coproc_segment_overrun),
91 INTG(X86_TRAP_TS, asm_exc_invalid_tss),
92 INTG(X86_TRAP_NP, asm_exc_segment_not_present),
93 INTG(X86_TRAP_SS, asm_exc_stack_segment),
94 INTG(X86_TRAP_GP, asm_exc_general_protection),
95 INTG(X86_TRAP_SPURIOUS, asm_exc_spurious_interrupt_bug),
96 INTG(X86_TRAP_MF, asm_exc_coprocessor_error),
97 INTG(X86_TRAP_AC, asm_exc_alignment_check),
98 INTG(X86_TRAP_XF, asm_exc_simd_coprocessor_error),
99
100#ifdef CONFIG_X86_32
101 TSKG(X86_TRAP_DF, GDT_ENTRY_DOUBLEFAULT_TSS),
102#else
103 ISTG(X86_TRAP_DF, asm_exc_double_fault, IST_INDEX_DF),
104#endif
105 ISTG(X86_TRAP_DB, asm_exc_debug, IST_INDEX_DB),
106
107#ifdef CONFIG_X86_MCE
108 ISTG(X86_TRAP_MC, asm_exc_machine_check, IST_INDEX_MCE),
109#endif
110
111#ifdef CONFIG_X86_CET
112 INTG(X86_TRAP_CP, asm_exc_control_protection),
113#endif
114
115#ifdef CONFIG_AMD_MEM_ENCRYPT
116 ISTG(X86_TRAP_VC, asm_exc_vmm_communication, IST_INDEX_VC),
117#endif
118
119 SYSG(X86_TRAP_OF, asm_exc_overflow),
120};
121
122static const struct idt_data ia32_idt[] __initconst = {
123#if defined(CONFIG_IA32_EMULATION)
124 SYSG(IA32_SYSCALL_VECTOR, asm_int80_emulation),
125#elif defined(CONFIG_X86_32)
126 SYSG(IA32_SYSCALL_VECTOR, entry_INT80_32),
127#endif
128};
129
130/*
131 * The APIC and SMP idt entries
132 */
133static const __initconst struct idt_data apic_idts[] = {
134#ifdef CONFIG_SMP
135 INTG(RESCHEDULE_VECTOR, asm_sysvec_reschedule_ipi),
136 INTG(CALL_FUNCTION_VECTOR, asm_sysvec_call_function),
137 INTG(CALL_FUNCTION_SINGLE_VECTOR, asm_sysvec_call_function_single),
138 INTG(REBOOT_VECTOR, asm_sysvec_reboot),
139#endif
140
141#ifdef CONFIG_X86_THERMAL_VECTOR
142 INTG(THERMAL_APIC_VECTOR, asm_sysvec_thermal),
143#endif
144
145#ifdef CONFIG_X86_MCE_THRESHOLD
146 INTG(THRESHOLD_APIC_VECTOR, asm_sysvec_threshold),
147#endif
148
149#ifdef CONFIG_X86_MCE_AMD
150 INTG(DEFERRED_ERROR_VECTOR, asm_sysvec_deferred_error),
151#endif
152
153#ifdef CONFIG_X86_LOCAL_APIC
154 INTG(LOCAL_TIMER_VECTOR, asm_sysvec_apic_timer_interrupt),
155 INTG(X86_PLATFORM_IPI_VECTOR, asm_sysvec_x86_platform_ipi),
156# if IS_ENABLED(CONFIG_KVM)
157 INTG(POSTED_INTR_VECTOR, asm_sysvec_kvm_posted_intr_ipi),
158 INTG(POSTED_INTR_WAKEUP_VECTOR, asm_sysvec_kvm_posted_intr_wakeup_ipi),
159 INTG(POSTED_INTR_NESTED_VECTOR, asm_sysvec_kvm_posted_intr_nested_ipi),
160# endif
161# ifdef CONFIG_IRQ_WORK
162 INTG(IRQ_WORK_VECTOR, asm_sysvec_irq_work),
163# endif
164 INTG(SPURIOUS_APIC_VECTOR, asm_sysvec_spurious_apic_interrupt),
165 INTG(ERROR_APIC_VECTOR, asm_sysvec_error_interrupt),
166# ifdef CONFIG_X86_POSTED_MSI
167 INTG(POSTED_MSI_NOTIFICATION_VECTOR, asm_sysvec_posted_msi_notification),
168# endif
169#endif
170};
171
172/* Must be page-aligned because the real IDT is used in the cpu entry area */
173static gate_desc idt_table[IDT_ENTRIES] __page_aligned_bss;
174
175static struct desc_ptr idt_descr __ro_after_init = {
176 .size = IDT_TABLE_SIZE - 1,
177 .address = (unsigned long) idt_table,
178};
179
180void load_current_idt(void)
181{
182 lockdep_assert_irqs_disabled();
183 load_idt(&idt_descr);
184}
185
186#ifdef CONFIG_X86_F00F_BUG
187bool idt_is_f00f_address(unsigned long address)
188{
189 return ((address - idt_descr.address) >> 3) == 6;
190}
191#endif
192
193static __init void
194idt_setup_from_table(gate_desc *idt, const struct idt_data *t, int size, bool sys)
195{
196 gate_desc desc;
197
198 for (; size > 0; t++, size--) {
199 idt_init_desc(&desc, t);
200 write_idt_entry(idt, t->vector, &desc);
201 if (sys)
202 set_bit(t->vector, system_vectors);
203 }
204}
205
206static __init void set_intr_gate(unsigned int n, const void *addr)
207{
208 struct idt_data data;
209
210 init_idt_data(&data, n, addr);
211
212 idt_setup_from_table(idt_table, &data, 1, false);
213}
214
215/**
216 * idt_setup_early_traps - Initialize the idt table with early traps
217 *
218 * On X8664 these traps do not use interrupt stacks as they can't work
219 * before cpu_init() is invoked and sets up TSS. The IST variants are
220 * installed after that.
221 */
222void __init idt_setup_early_traps(void)
223{
224 idt_setup_from_table(idt_table, early_idts, ARRAY_SIZE(early_idts),
225 true);
226 load_idt(&idt_descr);
227}
228
229/**
230 * idt_setup_traps - Initialize the idt table with default traps
231 */
232void __init idt_setup_traps(void)
233{
234 idt_setup_from_table(idt_table, def_idts, ARRAY_SIZE(def_idts), true);
235
236 if (ia32_enabled())
237 idt_setup_from_table(idt_table, ia32_idt, ARRAY_SIZE(ia32_idt), true);
238}
239
240#ifdef CONFIG_X86_64
241/*
242 * Early traps running on the DEFAULT_STACK because the other interrupt
243 * stacks work only after cpu_init().
244 */
245static const __initconst struct idt_data early_pf_idts[] = {
246 INTG(X86_TRAP_PF, asm_exc_page_fault),
247};
248
249/**
250 * idt_setup_early_pf - Initialize the idt table with early pagefault handler
251 *
252 * On X8664 this does not use interrupt stacks as they can't work before
253 * cpu_init() is invoked and sets up TSS. The IST variant is installed
254 * after that.
255 *
256 * Note, that X86_64 cannot install the real #PF handler in
257 * idt_setup_early_traps() because the memory initialization needs the #PF
258 * handler from the early_idt_handler_array to initialize the early page
259 * tables.
260 */
261void __init idt_setup_early_pf(void)
262{
263 idt_setup_from_table(idt_table, early_pf_idts,
264 ARRAY_SIZE(early_pf_idts), true);
265}
266#endif
267
268static void __init idt_map_in_cea(void)
269{
270 /*
271 * Set the IDT descriptor to a fixed read-only location in the cpu
272 * entry area, so that the "sidt" instruction will not leak the
273 * location of the kernel, and to defend the IDT against arbitrary
274 * memory write vulnerabilities.
275 */
276 cea_set_pte(CPU_ENTRY_AREA_RO_IDT_VADDR, __pa_symbol(idt_table),
277 PAGE_KERNEL_RO);
278 idt_descr.address = CPU_ENTRY_AREA_RO_IDT;
279}
280
281/**
282 * idt_setup_apic_and_irq_gates - Setup APIC/SMP and normal interrupt gates
283 */
284void __init idt_setup_apic_and_irq_gates(void)
285{
286 int i = FIRST_EXTERNAL_VECTOR;
287 void *entry;
288
289 idt_setup_from_table(idt_table, apic_idts, ARRAY_SIZE(apic_idts), true);
290
291 for_each_clear_bit_from(i, system_vectors, FIRST_SYSTEM_VECTOR) {
292 entry = irq_entries_start + IDT_ALIGN * (i - FIRST_EXTERNAL_VECTOR);
293 set_intr_gate(i, entry);
294 }
295
296#ifdef CONFIG_X86_LOCAL_APIC
297 for_each_clear_bit_from(i, system_vectors, NR_VECTORS) {
298 /*
299 * Don't set the non assigned system vectors in the
300 * system_vectors bitmap. Otherwise they show up in
301 * /proc/interrupts.
302 */
303 entry = spurious_entries_start + IDT_ALIGN * (i - FIRST_SYSTEM_VECTOR);
304 set_intr_gate(i, entry);
305 }
306#endif
307 /* Map IDT into CPU entry area and reload it. */
308 idt_map_in_cea();
309 load_idt(&idt_descr);
310
311 /* Make the IDT table read only */
312 set_memory_ro((unsigned long)&idt_table, 1);
313
314 idt_setup_done = true;
315}
316
317/**
318 * idt_setup_early_handler - Initializes the idt table with early handlers
319 */
320void __init idt_setup_early_handler(void)
321{
322 int i;
323
324 for (i = 0; i < NUM_EXCEPTION_VECTORS; i++)
325 set_intr_gate(i, early_idt_handler_array[i]);
326#ifdef CONFIG_X86_32
327 for ( ; i < NR_VECTORS; i++)
328 set_intr_gate(i, early_ignore_irq);
329#endif
330 load_idt(&idt_descr);
331}
332
333/**
334 * idt_invalidate - Invalidate interrupt descriptor table
335 */
336void idt_invalidate(void)
337{
338 static const struct desc_ptr idt = { .address = 0, .size = 0 };
339
340 load_idt(&idt);
341}
342
343void __init idt_install_sysvec(unsigned int n, const void *function)
344{
345 if (WARN_ON(n < FIRST_SYSTEM_VECTOR))
346 return;
347
348 if (WARN_ON(idt_setup_done))
349 return;
350
351 if (!WARN_ON(test_and_set_bit(n, system_vectors)))
352 set_intr_gate(n, function);
353}