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x86/idt: Prepare for table based init 

The IDT setup code is handled in several places. All of them use variants
of set_intr_gate() inlines. This can be done with a table based
initialization, which allows to reduce the inline zoo and puts all IDT
related code and information into a single place.

Add the infrastructure.

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/20170828064958.849877032@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner 2017-08-28 08:47:49 +02:00 committed by Ingo Molnar
parent 87e81786b1
commit 3318e97442
1 changed files with 67 additions and 0 deletions
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67
arch/x86/kernel/idt.c
View File

@ -5,8 +5,49 @@
*/
#include <linux/interrupt.h>
#include <asm/traps.h>
#include <asm/proto.h>
#include <asm/desc.h>
struct idt_data {
unsigned int vector;
unsigned int segment;
struct idt_bits bits;
const void *addr;
};
#define DPL0 0x0
#define DPL3 0x3
#define DEFAULT_STACK 0
#define G(_vector, _addr, _ist, _type, _dpl, _segment) \
{ \
.vector = _vector, \
.bits.ist = _ist, \
.bits.type = _type, \
.bits.dpl = _dpl, \
.bits.p = 1, \
.addr = _addr, \
.segment = _segment, \
}
/* Interrupt gate */
#define INTG(_vector, _addr) \
G(_vector, _addr, DEFAULT_STACK, GATE_INTERRUPT, DPL0, __KERNEL_CS)
/* System interrupt gate */
#define SYSG(_vector, _addr) \
G(_vector, _addr, DEFAULT_STACK, GATE_INTERRUPT, DPL3, __KERNEL_CS)
/* Interrupt gate with interrupt stack */
#define ISTG(_vector, _addr, _ist) \
G(_vector, _addr, _ist, GATE_INTERRUPT, DPL0, __KERNEL_CS)
/* Task gate */
#define TSKG(_vector, _gdt) \
G(_vector, NULL, DEFAULT_STACK, GATE_TASK, DPL0, _gdt << 3)
/* Must be page-aligned because the real IDT is used in a fixmap. */
gate_desc idt_table[IDT_ENTRIES] __page_aligned_bss;
@ -25,6 +66,32 @@ const struct desc_ptr debug_idt_descr = {
};
#endif
static inline void idt_init_desc(gate_desc *gate, const struct idt_data *d)
{
unsigned long addr = (unsigned long) d->addr;
gate->offset_low = (u16) addr;
gate->segment = (u16) d->segment;
gate->bits = d->bits;
gate->offset_middle = (u16) (addr >> 16);
#ifdef CONFIG_X86_64
gate->offset_high = (u32) (addr >> 32);
gate->reserved = 0;
#endif
}
static __init void
idt_setup_from_table(gate_desc *idt, const struct idt_data *t, int size)
{
gate_desc desc;
for (; size > 0; t++, size--) {
idt_init_desc(&desc, t);
set_bit(t->vector, used_vectors);
write_idt_entry(idt, t->vector, &desc);
}
}
/**
* idt_setup_early_handler - Initializes the idt table with early handlers
*/