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Subject[PATCH] [42/45] x86_64: use descriptor's functions instead of inline assembly
Date

From: Glauber de Oliveira Costa <gcosta@redhat.com>

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.

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
arch/x86_64/kernel/head64.c | 2 +-
arch/x86_64/kernel/reboot.c | 3 ++-
arch/x86_64/kernel/setup64.c | 4 ++--
arch/x86_64/kernel/suspend.c | 11 ++++++-----
include/asm-x86_64/desc.h | 29 +++++++++++++++++++++++++++++
5 files changed, 40 insertions(+), 9 deletions(-)
Index: linux/arch/x86_64/kernel/head64.c
===================================================================
--- linux.orig/arch/x86_64/kernel/head64.c
+++ linux/arch/x86_64/kernel/head64.c
@@ -70,7 +70,7 @@ void __init x86_64_start_kernel(char * r

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");

Index: linux/arch/x86_64/kernel/reboot.c
===================================================================
--- linux.orig/arch/x86_64/kernel/reboot.c
+++ linux/arch/x86_64/kernel/reboot.c
@@ -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;
Index: linux/arch/x86_64/kernel/setup64.c
===================================================================
--- linux.orig/arch/x86_64/kernel/setup64.c
+++ linux/arch/x86_64/kernel/setup64.c
@@ -224,8 +224,8 @@ 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();
Index: linux/arch/x86_64/kernel/suspend.c
===================================================================
--- linux.orig/arch/x86_64/kernel/suspend.c
+++ linux/arch/x86_64/kernel/suspend.c
@@ -32,9 +32,9 @@ void __save_processor_state(struct saved
/*
* 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 sa
* 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
Index: linux/include/asm-x86_64/desc.h
===================================================================
--- linux.orig/include/asm-x86_64/desc.h
+++ linux/include/asm-x86_64/desc.h
@@ -20,6 +20,15 @@ extern struct desc_struct cpu_gdt_table[
#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 +40,16 @@ 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 +90,16 @@ static inline void set_system_gate_ist(i
_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)
{
-
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