mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 21:24:00 +08:00
73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
|
#ifndef __I386_SCHED_H
|
||
|
|
#define __I386_SCHED_H
|
||
|
|
|
||
|
|
#include <linux/config.h>
|
||
|
|
#include <asm/desc.h>
|
||
|
|
#include <asm/atomic.h>
|
||
|
|
#include <asm/pgalloc.h>
|
||
|
|
#include <asm/tlbflush.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Used for LDT copy/destruction.
|
||
|
|
*/
|
||
|
|
int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
|
||
|
|
void destroy_context(struct mm_struct *mm);
|
||
|
|
|
||
|
|
|
||
|
|
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
|
||
|
|
{
|
||
|
|
#ifdef CONFIG_SMP
|
||
|
|
unsigned cpu = smp_processor_id();
|
||
|
|
if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_OK)
|
||
|
|
per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_LAZY;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void switch_mm(struct mm_struct *prev,
|
||
|
|
struct mm_struct *next,
|
||
|
|
struct task_struct *tsk)
|
||
|
|
{
|
||
|
|
int cpu = smp_processor_id();
|
||
|
|
|
||
|
|
if (likely(prev != next)) {
|
||
|
|
/* stop flush ipis for the previous mm */
|
||
|
|
cpu_clear(cpu, prev->cpu_vm_mask);
|
||
|
|
#ifdef CONFIG_SMP
|
||
|
|
per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_OK;
|
||
|
|
per_cpu(cpu_tlbstate, cpu).active_mm = next;
|
||
|
|
#endif
|
||
|
|
cpu_set(cpu, next->cpu_vm_mask);
|
||
|
|
|
||
|
|
/* Re-load page tables */
|
||
|
|
load_cr3(next->pgd);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* load the LDT, if the LDT is different:
|
||
|
|
*/
|
||
|
|
if (unlikely(prev->context.ldt != next->context.ldt))
|
||
|
|
load_LDT_nolock(&next->context, cpu);
|
||
|
|
}
|
||
|
|
#ifdef CONFIG_SMP
|
||
|
|
else {
|
||
|
|
per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_OK;
|
||
|
|
BUG_ON(per_cpu(cpu_tlbstate, cpu).active_mm != next);
|
||
|
|
|
||
|
|
if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) {
|
||
|
|
/* We were in lazy tlb mode and leave_mm disabled
|
||
|
|
* tlb flush IPI delivery. We must reload %cr3.
|
||
|
|
*/
|
||
|
|
load_cr3(next->pgd);
|
||
|
|
load_LDT_nolock(&next->context, cpu);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
#define deactivate_mm(tsk, mm) \
|
||
|
|
asm("movl %0,%%fs ; movl %0,%%gs": :"r" (0))
|
||
|
|
|
||
|
|
#define activate_mm(prev, next) \
|
||
|
|
switch_mm((prev),(next),NULL)
|
||
|
|
|
||
|
|
#endif
|