diff options
Diffstat (limited to 'arch/i386/kernel/sysenter.c')
| -rw-r--r-- | arch/i386/kernel/sysenter.c | 67 |
1 files changed, 0 insertions, 67 deletions
diff --git a/arch/i386/kernel/sysenter.c b/arch/i386/kernel/sysenter.c deleted file mode 100644 index 0bada1870bd..00000000000 --- a/arch/i386/kernel/sysenter.c +++ /dev/null @@ -1,67 +0,0 @@ -/* - * linux/arch/i386/kernel/sysenter.c - * - * (C) Copyright 2002 Linus Torvalds - * - * This file contains the needed initializations to support sysenter. - */ - -#include <linux/init.h> -#include <linux/smp.h> -#include <linux/thread_info.h> -#include <linux/sched.h> -#include <linux/gfp.h> -#include <linux/string.h> -#include <linux/elf.h> - -#include <asm/cpufeature.h> -#include <asm/msr.h> -#include <asm/pgtable.h> -#include <asm/unistd.h> - -extern asmlinkage void sysenter_entry(void); - -void enable_sep_cpu(void) -{ - int cpu = get_cpu(); - struct tss_struct *tss = &per_cpu(init_tss, cpu); - - if (!boot_cpu_has(X86_FEATURE_SEP)) { - put_cpu(); - return; - } - - tss->ss1 = __KERNEL_CS; - tss->esp1 = sizeof(struct tss_struct) + (unsigned long) tss; - wrmsr(MSR_IA32_SYSENTER_CS, __KERNEL_CS, 0); - wrmsr(MSR_IA32_SYSENTER_ESP, tss->esp1, 0); - wrmsr(MSR_IA32_SYSENTER_EIP, (unsigned long) sysenter_entry, 0); - put_cpu(); -} - -/* - * These symbols are defined by vsyscall.o to mark the bounds - * of the ELF DSO images included therein. - */ -extern const char vsyscall_int80_start, vsyscall_int80_end; -extern const char vsyscall_sysenter_start, vsyscall_sysenter_end; - -int __init sysenter_setup(void) -{ - void *page = (void *)get_zeroed_page(GFP_ATOMIC); - - __set_fixmap(FIX_VSYSCALL, __pa(page), PAGE_READONLY_EXEC); - - if (!boot_cpu_has(X86_FEATURE_SEP)) { - memcpy(page, - &vsyscall_int80_start, - &vsyscall_int80_end - &vsyscall_int80_start); - return 0; - } - - memcpy(page, - &vsyscall_sysenter_start, - &vsyscall_sysenter_end - &vsyscall_sysenter_start); - - return 0; -} |
