diff options
| -rw-r--r-- | arch/x86/include/asm/desc.h | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/idt.c | 23 | ||||
| -rw-r--r-- | arch/x86/kernel/traps.c | 6 |
3 files changed, 26 insertions, 5 deletions
diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h index 5a3cdeb7cb03..930acd5d85f6 100644 --- a/arch/x86/include/asm/desc.h +++ b/arch/x86/include/asm/desc.h @@ -509,8 +509,10 @@ extern void idt_setup_early_traps(void); #ifdef CONFIG_X86_64 extern void idt_setup_early_pf(void); +extern void idt_setup_debugidt_traps(void); #else static inline void idt_setup_early_pf(void) { } +static inline void idt_setup_debugidt_traps(void) { } #endif extern void idt_invalidate(void *addr); diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c index 64e221172a17..f5281b8f1131 100644 --- a/arch/x86/kernel/idt.c +++ b/arch/x86/kernel/idt.c @@ -68,6 +68,15 @@ static const __initdata struct idt_data early_idts[] = { static const __initdata struct idt_data early_pf_idts[] = { INTG(X86_TRAP_PF, page_fault), }; + +/* + * Override for the debug_idt. Same as the default, but with interrupt + * stack set to DEFAULT_STACK (0). Required for NMI trap handling. + */ +static const __initdata struct idt_data dbg_idts[] = { + INTG(X86_TRAP_DB, debug), + INTG(X86_TRAP_BP, int3), +}; #endif /* Must be page-aligned because the real IDT is used in a fixmap. */ @@ -82,6 +91,10 @@ struct desc_ptr idt_descr __ro_after_init = { /* No need to be aligned, but done to keep all IDTs defined the same way. */ gate_desc debug_idt_table[IDT_ENTRIES] __page_aligned_bss; +/* + * Override for the debug_idt. Same as the default, but with interrupt + * stack set to DEFAULT_STACK (0). Required for NMI trap handling. + */ const struct desc_ptr debug_idt_descr = { .size = IDT_ENTRIES * 16 - 1, .address = (unsigned long) debug_idt_table, @@ -143,6 +156,16 @@ void __init idt_setup_early_pf(void) idt_setup_from_table(idt_table, early_pf_idts, ARRAY_SIZE(early_pf_idts)); } + +/** + * idt_setup_debugidt_traps - Initialize the debug idt table with debug traps + */ +void __init idt_setup_debugidt_traps(void) +{ + memcpy(&debug_idt_table, &idt_table, IDT_ENTRIES * 16); + + idt_setup_from_table(debug_idt_table, dbg_idts, ARRAY_SIZE(dbg_idts)); +} #endif /** diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c index 835c7e8a0eb1..1492bf5eb549 100644 --- a/arch/x86/kernel/traps.c +++ b/arch/x86/kernel/traps.c @@ -990,9 +990,5 @@ void __init trap_init(void) x86_init.irqs.trap_init(); -#ifdef CONFIG_X86_64 - memcpy(&debug_idt_table, &idt_table, IDT_ENTRIES * 16); - set_nmi_gate(X86_TRAP_DB, &debug); - set_nmi_gate(X86_TRAP_BP, &int3); -#endif + idt_setup_debugidt_traps(); } |