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[PATCH] i386: inline assembler: cleanup and encapsulate descriptor and task register management 

i386 inline assembler cleanup.

This change encapsulates descriptor and task register management.  Also,
it is possible to improve assembler generation in two cases; savesegment
may store the value in a register instead of a memory location, which
allows GCC to optimize stack variables into registers, and MOV MEM, SEG
is always a 16-bit write to memory, making the casting in math-emu
unnecessary.

Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Zachary Amsden 2005-09-03 15:56:38 -07:00 committed by Linus Torvalds
parent 245067d167
commit 4d37e7e3fd
11 changed files with 43 additions and 40 deletions
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4
arch/i386/kernel/cpu/common.c
View File

@ -613,8 +613,8 @@ void __devinit cpu_init(void)
memcpy(thread->tls_array, &per_cpu(cpu_gdt_table, cpu),
GDT_ENTRY_TLS_ENTRIES * 8);
__asm__ __volatile__("lgdt %0" : : "m" (cpu_gdt_descr[cpu]));
__asm__ __volatile__("lidt %0" : : "m" (idt_descr));
load_gdt(&cpu_gdt_descr[cpu]);
load_idt(&idt_descr);
/*
* Delete NT

2
arch/i386/kernel/doublefault.c
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@ -20,7 +20,7 @@ static void doublefault_fn(void)
struct Xgt_desc_struct gdt_desc = {0, 0};
unsigned long gdt, tss;
__asm__ __volatile__("sgdt %0": "=m" (gdt_desc): :"memory");
store_gdt(&gdt_desc);
gdt = gdt_desc.address;
printk("double fault, gdt at %08lx [%d bytes]\n", gdt, gdt_desc.size);

5
arch/i386/kernel/efi.c
View File

@ -104,8 +104,7 @@ static void efi_call_phys_prelog(void)
local_flush_tlb();
cpu_gdt_descr[0].address = __pa(cpu_gdt_descr[0].address);
__asm__ __volatile__("lgdt %0":"=m"
(*(struct Xgt_desc_struct *) __pa(&cpu_gdt_descr[0])));
load_gdt((struct Xgt_desc_struct *) __pa(&cpu_gdt_descr[0]));
}
static void efi_call_phys_epilog(void)
@ -114,7 +113,7 @@ static void efi_call_phys_epilog(void)
cpu_gdt_descr[0].address =
(unsigned long) __va(cpu_gdt_descr[0].address);
__asm__ __volatile__("lgdt %0":"=m"(cpu_gdt_descr));
load_gdt(&cpu_gdt_descr[0]);
cr4 = read_cr4();
if (cr4 & X86_CR4_PSE) {

9
arch/i386/kernel/reboot.c
View File

@ -13,6 +13,7 @@
#include <linux/dmi.h>
#include <asm/uaccess.h>
#include <asm/apic.h>
#include <asm/desc.h>
#include "mach_reboot.h"
#include <linux/reboot_fixups.h>
@ -242,13 +243,13 @@ void machine_real_restart(unsigned char *code, int length)
/* Set up the IDT for real mode. */
__asm__ __volatile__ ("lidt %0" : : "m" (real_mode_idt));
load_idt(&real_mode_idt);
/* Set up a GDT from which we can load segment descriptors for real
mode. The GDT is not used in real mode; it is just needed here to
prepare the descriptors. */
__asm__ __volatile__ ("lgdt %0" : : "m" (real_mode_gdt));
load_gdt(&real_mode_gdt);
/* Load the data segment registers, and thus the descriptors ready for
real mode. The base address of each segment is 0x100, 16 times the
@ -316,7 +317,7 @@ void machine_emergency_restart(void)
if (!reboot_thru_bios) {
if (efi_enabled) {
efi.reset_system(EFI_RESET_COLD, EFI_SUCCESS, 0, NULL);
__asm__ __volatile__("lidt %0": :"m" (no_idt));
load_idt(&no_idt);
__asm__ __volatile__("int3");
}
/* rebooting needs to touch the page at absolute addr 0 */
@ -325,7 +326,7 @@ void machine_emergency_restart(void)
mach_reboot_fixups(); /* for board specific fixups */
mach_reboot();
/* That didn't work - force a triple fault.. */
__asm__ __volatile__("lidt %0": :"m" (no_idt));
load_idt(&no_idt);
__asm__ __volatile__("int3");
}
}

4
arch/i386/kernel/signal.c
View File

@ -278,9 +278,9 @@ setup_sigcontext(struct sigcontext __user *sc, struct _fpstate __user *fpstate,
int tmp, err = 0;
tmp = 0;
__asm__("movl %%gs,%0" : "=r"(tmp): "0"(tmp));
savesegment(gs, tmp);
err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
__asm__("movl %%fs,%0" : "=r"(tmp): "0"(tmp));
savesegment(fs, tmp);
err |= __put_user(tmp, (unsigned int __user *)&sc->fs);
err |= __put_user(regs->xes, (unsigned int __user *)&sc->es);

2
arch/i386/kernel/traps.c
View File

@ -1008,7 +1008,7 @@ void __init trap_init_f00f_bug(void)
* it uses the read-only mapped virtual address.
*/
idt_descr.address = fix_to_virt(FIX_F00F_IDT);
__asm__ __volatile__("lidt %0" : : "m" (idt_descr));
load_idt(&idt_descr);
}
#endif

4
arch/i386/kernel/vm86.c
View File

@ -294,8 +294,8 @@ static void do_sys_vm86(struct kernel_vm86_struct *info, struct task_struct *tsk
*/
info->regs32->eax = 0;
tsk->thread.saved_esp0 = tsk->thread.esp0;
asm volatile("mov %%fs,%0":"=m" (tsk->thread.saved_fs));
asm volatile("mov %%gs,%0":"=m" (tsk->thread.saved_gs));
savesegment(fs, tsk->thread.saved_fs);
savesegment(gs, tsk->thread.saved_gs);
tss = &per_cpu(init_tss, get_cpu());
tsk->thread.esp0 = (unsigned long) &info->VM86_TSS_ESP0;

13
arch/i386/math-emu/get_address.c
View File

@ -155,7 +155,6 @@ static long pm_address(u_char FPU_modrm, u_char segment,
{
struct desc_struct descriptor;
unsigned long base_address, limit, address, seg_top;
unsigned short selector;
segment--;
@ -173,17 +172,11 @@ static long pm_address(u_char FPU_modrm, u_char segment,
/* fs and gs aren't used by the kernel, so they still have their
user-space values. */
case PREFIX_FS_-1:
/* The cast is needed here to get gcc 2.8.0 to use a 16 bit register
in the assembler statement. */
__asm__("mov %%fs,%0":"=r" (selector));
addr->selector = selector;
/* N.B. - movl %seg, mem is a 2 byte write regardless of prefix */
savesegment(fs, addr->selector);
break;
case PREFIX_GS_-1:
/* The cast is needed here to get gcc 2.8.0 to use a 16 bit register
in the assembler statement. */
__asm__("mov %%gs,%0":"=r" (selector));
addr->selector = selector;
savesegment(gs, addr->selector);
break;
default:
addr->selector = PM_REG_(segment);

26
arch/i386/power/cpu.c
View File

@ -42,17 +42,17 @@ 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(&ctxt->gdt_limit);
store_idt(&ctxt->idt_limit);
store_tr(ctxt->tr);
/*
* segment registers
*/
asm volatile ("movw %%es, %0" : "=m" (ctxt->es));
asm volatile ("movw %%fs, %0" : "=m" (ctxt->fs));
asm volatile ("movw %%gs, %0" : "=m" (ctxt->gs));
asm volatile ("movw %%ss, %0" : "=m" (ctxt->ss));
savesegment(es, ctxt->es);
savesegment(fs, ctxt->fs);
savesegment(gs, ctxt->gs);
savesegment(ss, ctxt->ss);
/*
* control registers
@ -118,16 +118,16 @@ 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(&ctxt->gdt_limit);
load_idt(&ctxt->idt_limit);
/*
* segment registers
*/
asm volatile ("movw %0, %%es" :: "r" (ctxt->es));
asm volatile ("movw %0, %%fs" :: "r" (ctxt->fs));
asm volatile ("movw %0, %%gs" :: "r" (ctxt->gs));
asm volatile ("movw %0, %%ss" :: "r" (ctxt->ss));
loadsegment(es, ctxt->es);
loadsegment(fs, ctxt->fs);
loadsegment(gs, ctxt->gs);
loadsegment(ss, ctxt->ss);
/*
* sysenter MSRs

10
include/asm-i386/desc.h
View File

@ -30,6 +30,16 @@ extern struct Xgt_desc_struct idt_descr, cpu_gdt_descr[NR_CPUS];
#define load_TR_desc() __asm__ __volatile__("ltr %%ax"::"a" (GDT_ENTRY_TSS*8))
#define load_LDT_desc() __asm__ __volatile__("lldt %%ax"::"a" (GDT_ENTRY_LDT*8))
#define load_gdt(dtr) __asm__ __volatile("lgdt %0"::"m" (*dtr))
#define load_idt(dtr) __asm__ __volatile("lidt %0"::"m" (*dtr))
#define load_tr(tr) __asm__ __volatile("ltr %0"::"mr" (tr))
#define load_ldt(ldt) __asm__ __volatile("lldt %0"::"mr" (ldt))
#define store_gdt(dtr) __asm__ ("sgdt %0":"=m" (*dtr))
#define store_idt(dtr) __asm__ ("sidt %0":"=m" (*dtr))
#define store_tr(tr) __asm__ ("str %0":"=mr" (tr))
#define store_ldt(ldt) __asm__ ("sldt %0":"=mr" (ldt))
/*
* This is the ldt that every process will get unless we need
* something other than this.

4
include/asm-i386/system.h
View File

@ -93,13 +93,13 @@ static inline unsigned long _get_base(char * addr)
".align 4\n\t" \
".long 1b,3b\n" \
".previous" \
: :"m" (value))
: :"rm" (value))
/*
* Save a segment register away
*/
#define savesegment(seg, value) \
asm volatile("mov %%" #seg ",%0":"=m" (value))
asm volatile("mov %%" #seg ",%0":"=rm" (value))
/*
* Clear and set 'TS' bit respectively