mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 05:06:44 +07:00
6fe940d6c3
Make SEP init per-cpu, so it is hotplug safe. Signed-off-by: Li Shaohua<shaohua.li@intel.com> Signed-off-by: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
68 lines
1.5 KiB
C
68 lines
1.5 KiB
C
/*
|
|
* 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;
|
|
}
|