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x86/idt: Move early IDT handler setup to IDT code 

The early IDT handler setup is done in C entry code on 64-bit kernels and in
ASM entry code on 32-bit kernels.

Move the 64-bit variant to the IDT code so it can be shared with 32-bit
in the next step.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20170828064958.679561404@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner 2017-08-28 08:47:47 +02:00 committed by Ingo Molnar
parent e802a51ede
commit 588787fde7
3 changed files with 22 additions and 5 deletions
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9
arch/x86/include/asm/desc.h
View File

@ -504,6 +504,15 @@ static inline void load_current_idt(void)
load_idt((const struct desc_ptr *)&idt_descr);
}
extern void idt_setup_early_handler(void);
extern void idt_setup_early_traps(void);
#ifdef CONFIG_X86_64
extern void idt_setup_early_pf(void);
#else
static inline void idt_setup_early_pf(void) { }
#endif
extern void idt_invalidate(void *addr);
#endif /* _ASM_X86_DESC_H */

6
arch/x86/kernel/head64.c
View File

@ -255,8 +255,6 @@ static void __init copy_bootdata(char *real_mode_data)
asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data)
{
int i;
/*
* Build-time sanity checks on the kernel image and module
* area mappings. (these are purely build-time and produce no code)
@ -282,9 +280,7 @@ asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data)
kasan_early_init();
for (i = 0; i < NUM_EXCEPTION_VECTORS; i++)
set_intr_gate(i, early_idt_handler_array[i]);
load_idt((const struct desc_ptr *)&idt_descr);
idt_setup_early_handler();
copy_bootdata(__va(real_mode_data));

12
arch/x86/kernel/idt.c
View File

@ -25,6 +25,18 @@ const struct desc_ptr debug_idt_descr = {
};
#endif
/**
* idt_setup_early_handler - Initializes the idt table with early handlers
*/
void __init idt_setup_early_handler(void)
{
int i;
for (i = 0; i < NUM_EXCEPTION_VECTORS; i++)
set_intr_gate(i, early_idt_handler_array[i]);
load_idt(&idt_descr);
}
/**
* idt_invalidate - Invalidate interrupt descriptor table
* @addr: The virtual address of the 'invalid' IDT