71ff49d71b
Impact: cleanup set_pte_present() is no longer used, directly or indirectly, so remove it. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Xen-devel <xen-devel@lists.xensource.com> Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Alok Kataria <akataria@vmware.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Avi Kivity <avi@redhat.com> LKML-Reference: <1237406613-2929-2-git-send-email-jeremy@goop.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
#ifndef _ASM_X86_PGTABLE_3LEVEL_H
|
|
#define _ASM_X86_PGTABLE_3LEVEL_H
|
|
|
|
/*
|
|
* Intel Physical Address Extension (PAE) Mode - three-level page
|
|
* tables on PPro+ CPUs.
|
|
*
|
|
* Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
|
|
*/
|
|
|
|
#define pte_ERROR(e) \
|
|
printk("%s:%d: bad pte %p(%08lx%08lx).\n", \
|
|
__FILE__, __LINE__, &(e), (e).pte_high, (e).pte_low)
|
|
#define pmd_ERROR(e) \
|
|
printk("%s:%d: bad pmd %p(%016Lx).\n", \
|
|
__FILE__, __LINE__, &(e), pmd_val(e))
|
|
#define pgd_ERROR(e) \
|
|
printk("%s:%d: bad pgd %p(%016Lx).\n", \
|
|
__FILE__, __LINE__, &(e), pgd_val(e))
|
|
|
|
/* Rules for using set_pte: the pte being assigned *must* be
|
|
* either not present or in a state where the hardware will
|
|
* not attempt to update the pte. In places where this is
|
|
* not possible, use pte_get_and_clear to obtain the old pte
|
|
* value and then use set_pte to update it. -ben
|
|
*/
|
|
static inline void native_set_pte(pte_t *ptep, pte_t pte)
|
|
{
|
|
ptep->pte_high = pte.pte_high;
|
|
smp_wmb();
|
|
ptep->pte_low = pte.pte_low;
|
|
}
|
|
|
|
static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
|
|
{
|
|
set_64bit((unsigned long long *)(ptep), native_pte_val(pte));
|
|
}
|
|
|
|
static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
|
|
{
|
|
set_64bit((unsigned long long *)(pmdp), native_pmd_val(pmd));
|
|
}
|
|
|
|
static inline void native_set_pud(pud_t *pudp, pud_t pud)
|
|
{
|
|
set_64bit((unsigned long long *)(pudp), native_pud_val(pud));
|
|
}
|
|
|
|
/*
|
|
* For PTEs and PDEs, we must clear the P-bit first when clearing a page table
|
|
* entry, so clear the bottom half first and enforce ordering with a compiler
|
|
* barrier.
|
|
*/
|
|
static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
|
|
pte_t *ptep)
|
|
{
|
|
ptep->pte_low = 0;
|
|
smp_wmb();
|
|
ptep->pte_high = 0;
|
|
}
|
|
|
|
static inline void native_pmd_clear(pmd_t *pmd)
|
|
{
|
|
u32 *tmp = (u32 *)pmd;
|
|
*tmp = 0;
|
|
smp_wmb();
|
|
*(tmp + 1) = 0;
|
|
}
|
|
|
|
static inline void pud_clear(pud_t *pudp)
|
|
{
|
|
unsigned long pgd;
|
|
|
|
set_pud(pudp, __pud(0));
|
|
|
|
/*
|
|
* According to Intel App note "TLBs, Paging-Structure Caches,
|
|
* and Their Invalidation", April 2007, document 317080-001,
|
|
* section 8.1: in PAE mode we explicitly have to flush the
|
|
* TLB via cr3 if the top-level pgd is changed...
|
|
*
|
|
* Make sure the pud entry we're updating is within the
|
|
* current pgd to avoid unnecessary TLB flushes.
|
|
*/
|
|
pgd = read_cr3();
|
|
if (__pa(pudp) >= pgd && __pa(pudp) <
|
|
(pgd + sizeof(pgd_t)*PTRS_PER_PGD))
|
|
write_cr3(pgd);
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static inline pte_t native_ptep_get_and_clear(pte_t *ptep)
|
|
{
|
|
pte_t res;
|
|
|
|
/* xchg acts as a barrier before the setting of the high bits */
|
|
res.pte_low = xchg(&ptep->pte_low, 0);
|
|
res.pte_high = ptep->pte_high;
|
|
ptep->pte_high = 0;
|
|
|
|
return res;
|
|
}
|
|
#else
|
|
#define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
|
|
#endif
|
|
|
|
/*
|
|
* Bits 0, 6 and 7 are taken in the low part of the pte,
|
|
* put the 32 bits of offset into the high part.
|
|
*/
|
|
#define pte_to_pgoff(pte) ((pte).pte_high)
|
|
#define pgoff_to_pte(off) \
|
|
((pte_t) { { .pte_low = _PAGE_FILE, .pte_high = (off) } })
|
|
#define PTE_FILE_MAX_BITS 32
|
|
|
|
/* Encode and de-code a swap entry */
|
|
#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > 5)
|
|
#define __swp_type(x) (((x).val) & 0x1f)
|
|
#define __swp_offset(x) ((x).val >> 5)
|
|
#define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) << 5})
|
|
#define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high })
|
|
#define __swp_entry_to_pte(x) ((pte_t){ { .pte_high = (x).val } })
|
|
|
|
#endif /* _ASM_X86_PGTABLE_3LEVEL_H */
|