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x86/idt: Consolidate idt functionality

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- Move load_current_idt() out of line and replace the hideous comment with
   a lockdep assert. This allows to make idt_table and idt_descr static.

 - Mark idt_table read only after the IDT initialization is complete.

 - Shuffle code around to consolidate the #ifdef sections into one.

 - Adapt the F00F bug code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200528145523.084915381@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-05-28 16:53:20 +02:00
parent 00229a5430
commit 3e77abda65
3 changed files with 44 additions and 52 deletions
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17
arch/x86/include/asm/desc.h
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@@ -40,9 +40,6 @@ static inline void fill_ldt(struct desc_struct *desc, const struct user_desc *in
desc->l = 0;
}
extern struct desc_ptr idt_descr;
extern gate_desc idt_table[];
struct gdt_page {
struct desc_struct gdt[GDT_ENTRIES];
} __attribute__((aligned(PAGE_SIZE)));
@@ -388,22 +385,12 @@ void alloc_intr_gate(unsigned int n, const void *addr);
extern unsigned long system_vectors[];
/*
* The load_current_idt() must be called with interrupts disabled
* to avoid races. That way the IDT will always be set back to the expected
* descriptor. It's also called when a CPU is being initialized, and
* that doesn't need to disable interrupts, as nothing should be
* bothering the CPU then.
*/
static __always_inline void load_current_idt(void)
{
load_idt((const struct desc_ptr *)&idt_descr);
}
extern void load_current_idt(void);
extern void idt_setup_early_handler(void);
extern void idt_setup_early_traps(void);
extern void idt_setup_traps(void);
extern void idt_setup_apic_and_irq_gates(void);
extern bool idt_is_f00f_address(unsigned long address);
#ifdef CONFIG_X86_64
extern void idt_setup_early_pf(void);