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x86: use descriptor's functions instead of inline assembly 

This patch provides a new set of functions for managing the descriptor
tables that can be used instead of putting the raw assembly in .c files.

Remodeling of store_tr() suggested by Frederik Deweerdt.

[ tglx: arch/x86 adaptation ]

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Glauber de Oliveira Costa 2007-10-19 20:35:03 +02:00 committed by Thomas Gleixner
parent 9d975ebda5
commit 9d1c6e7c86
5 changed files with 41 additions and 9 deletions
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2
arch/x86/kernel/head64.c
View File

@ -58,7 +58,7 @@ void __init x86_64_start_kernel(char * real_mode_data)
for (i = 0; i < IDT_ENTRIES; i++)
set_intr_gate(i, early_idt_handler);
asm volatile("lidt %0" :: "m" (idt_descr));
load_idt((const struct desc_ptr *)&idt_descr);
early_printk("Kernel alive\n");

3
arch/x86/kernel/reboot_64.c
View File

@ -11,6 +11,7 @@
#include <linux/sched.h>
#include <asm/io.h>
#include <asm/delay.h>
#include <asm/desc.h>
#include <asm/hw_irq.h>
#include <asm/system.h>
#include <asm/pgtable.h>
@ -136,7 +137,7 @@ void machine_emergency_restart(void)
}
case BOOT_TRIPLE:
__asm__ __volatile__("lidt (%0)": :"r" (&no_idt));
load_idt((const struct desc_ptr *)&no_idt);
__asm__ __volatile__("int3");
reboot_type = BOOT_KBD;

4
arch/x86/kernel/setup64.c
View File

@ -230,8 +230,8 @@ void __cpuinit cpu_init (void)
memcpy(cpu_gdt(cpu), cpu_gdt_table, GDT_SIZE);
cpu_gdt_descr[cpu].size = GDT_SIZE;
asm volatile("lgdt %0" :: "m" (cpu_gdt_descr[cpu]));
asm volatile("lidt %0" :: "m" (idt_descr));
load_gdt((const struct desc_ptr *)&cpu_gdt_descr[cpu]);
load_idt((const struct desc_ptr *)&idt_descr);
memset(me->thread.tls_array, 0, GDT_ENTRY_TLS_ENTRIES * 8);
syscall_init();

11
arch/x86/kernel/suspend_64.c
View File

@ -32,9 +32,9 @@ void __save_processor_state(struct saved_context *ctxt)
/*
* descriptor tables
*/
asm volatile ("sgdt %0" : "=m" (ctxt->gdt_limit));
asm volatile ("sidt %0" : "=m" (ctxt->idt_limit));
asm volatile ("str %0" : "=m" (ctxt->tr));
store_gdt((struct desc_ptr *)&ctxt->gdt_limit);
store_idt((struct desc_ptr *)&ctxt->idt_limit);
store_tr(ctxt->tr);
/* XMM0..XMM15 should be handled by kernel_fpu_begin(). */
/*
@ -91,8 +91,9 @@ void __restore_processor_state(struct saved_context *ctxt)
* now restore the descriptor tables to their proper values
* ltr is done i fix_processor_context().
*/
asm volatile ("lgdt %0" :: "m" (ctxt->gdt_limit));
asm volatile ("lidt %0" :: "m" (ctxt->idt_limit));
load_gdt((const struct desc_ptr *)&ctxt->gdt_limit);
load_idt((const struct desc_ptr *)&ctxt->idt_limit);
/*
* segment registers

30
include/asm-x86/desc_64.h
View File

@ -20,6 +20,16 @@ extern struct desc_struct cpu_gdt_table[GDT_ENTRIES];
#define load_LDT_desc() asm volatile("lldt %w0"::"r" (GDT_ENTRY_LDT*8))
#define clear_LDT() asm volatile("lldt %w0"::"r" (0))
static inline unsigned long __store_tr(void)
{
unsigned long tr;
asm volatile ("str %w0":"=r" (tr));
return tr;
}
#define store_tr(tr) (tr) = __store_tr()
/*
* This is the ldt that every process will get unless we need
* something other than this.
@ -31,6 +41,16 @@ extern struct desc_ptr cpu_gdt_descr[];
/* the cpu gdt accessor */
#define cpu_gdt(_cpu) ((struct desc_struct *)cpu_gdt_descr[_cpu].address)
static inline void load_gdt(const struct desc_ptr *ptr)
{
asm volatile("lgdt %w0"::"m" (*ptr));
}
static inline void store_gdt(struct desc_ptr *ptr)
{
asm("sgdt %w0":"=m" (*ptr));
}
static inline void _set_gate(void *adr, unsigned type, unsigned long func, unsigned dpl, unsigned ist)
{
struct gate_struct s;
@ -71,6 +91,16 @@ static inline void set_system_gate_ist(int nr, void *func, unsigned ist)
_set_gate(&idt_table[nr], GATE_INTERRUPT, (unsigned long) func, 3, ist);
}
static inline void load_idt(const struct desc_ptr *ptr)
{
asm volatile("lidt %w0"::"m" (*ptr));
}
static inline void store_idt(struct desc_ptr *dtr)
{
asm("sidt %w0":"=m" (*dtr));
}
static inline void set_tssldt_descriptor(void *ptr, unsigned long tss, unsigned type,
unsigned size)
{