1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
#ifndef __X86_64_MMU_CONTEXT_H
|
|
#define __X86_64_MMU_CONTEXT_H
|
|
|
|
#include <linux/config.h>
|
|
#include <asm/desc.h>
|
|
#include <asm/atomic.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/pda.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
/*
|
|
* possibly do the LDT unload here?
|
|
*/
|
|
int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
|
|
void destroy_context(struct mm_struct *mm);
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
|
|
{
|
|
if (read_pda(mmu_state) == TLBSTATE_OK)
|
|
write_pda(mmu_state, TLBSTATE_LAZY);
|
|
}
|
|
#else
|
|
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static inline void load_cr3(pgd_t *pgd)
|
|
{
|
|
asm volatile("movq %0,%%cr3" :: "r" (__pa(pgd)) : "memory");
|
|
}
|
|
|
|
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
|
|
struct task_struct *tsk)
|
|
{
|
|
unsigned cpu = smp_processor_id();
|
|
if (likely(prev != next)) {
|
|
/* stop flush ipis for the previous mm */
|
|
clear_bit(cpu, &prev->cpu_vm_mask);
|
|
#ifdef CONFIG_SMP
|
|
write_pda(mmu_state, TLBSTATE_OK);
|
|
write_pda(active_mm, next);
|
|
#endif
|
|
set_bit(cpu, &next->cpu_vm_mask);
|
|
load_cr3(next->pgd);
|
|
|
|
if (unlikely(next->context.ldt != prev->context.ldt))
|
|
load_LDT_nolock(&next->context, cpu);
|
|
}
|
|
#ifdef CONFIG_SMP
|
|
else {
|
|
write_pda(mmu_state, TLBSTATE_OK);
|
|
if (read_pda(active_mm) != next)
|
|
out_of_line_bug();
|
|
if(!test_and_set_bit(cpu, &next->cpu_vm_mask)) {
|
|
/* We were in lazy tlb mode and leave_mm disabled
|
|
* tlb flush IPI delivery. We must reload CR3
|
|
* to make sure to use no freed page tables.
|
|
*/
|
|
load_cr3(next->pgd);
|
|
load_LDT_nolock(&next->context, cpu);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#define deactivate_mm(tsk,mm) do { \
|
|
load_gs_index(0); \
|
|
asm volatile("movl %0,%%fs"::"r"(0)); \
|
|
} while(0)
|
|
|
|
#define activate_mm(prev, next) \
|
|
switch_mm((prev),(next),NULL)
|
|
|
|
|
|
#endif
|