mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 13:43:55 +08:00
d6d861e3c9
The ptep_establish macro is only used on user-level PTEs, for P->P mapping changes. Since these always happen under protection of the pagetable lock, the strong synchronization of a 64-bit cmpxchg is not needed, in fact, not even a lock prefix needs to be used. We can simply instead clear the P-bit, followed by a normal set. The write ordering is still important to avoid the possibility of the TLB snooping a partially written PTE and getting a bad mapping installed. Signed-off-by: Zachary Amsden <zach@vmware.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
#ifndef _I386_PGTABLE_2LEVEL_H
|
|
#define _I386_PGTABLE_2LEVEL_H
|
|
|
|
#include <asm-generic/pgtable-nopmd.h>
|
|
|
|
#define pte_ERROR(e) \
|
|
printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
|
|
#define pgd_ERROR(e) \
|
|
printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
|
|
|
|
/*
|
|
* Certain architectures need to do special things when PTEs
|
|
* within a page table are directly modified. Thus, the following
|
|
* hook is made available.
|
|
*/
|
|
#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
|
|
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
|
|
#define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
|
|
#define set_pte_present(mm,addr,ptep,pteval) set_pte_at(mm,addr,ptep,pteval)
|
|
#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
|
|
|
|
#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
|
|
#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
|
|
|
|
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
|
|
#define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte_low, 0))
|
|
|
|
#define pte_page(x) pfn_to_page(pte_pfn(x))
|
|
#define pte_none(x) (!(x).pte_low)
|
|
#define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
|
|
#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
|
|
#define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
|
|
|
|
/*
|
|
* All present user pages are user-executable:
|
|
*/
|
|
static inline int pte_exec(pte_t pte)
|
|
{
|
|
return pte_user(pte);
|
|
}
|
|
|
|
/*
|
|
* All present pages are kernel-executable:
|
|
*/
|
|
static inline int pte_exec_kernel(pte_t pte)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Bits 0, 6 and 7 are taken, split up the 29 bits of offset
|
|
* into this range:
|
|
*/
|
|
#define PTE_FILE_MAX_BITS 29
|
|
|
|
#define pte_to_pgoff(pte) \
|
|
((((pte).pte_low >> 1) & 0x1f ) + (((pte).pte_low >> 8) << 5 ))
|
|
|
|
#define pgoff_to_pte(off) \
|
|
((pte_t) { (((off) & 0x1f) << 1) + (((off) >> 5) << 8) + _PAGE_FILE })
|
|
|
|
/* Encode and de-code a swap entry */
|
|
#define __swp_type(x) (((x).val >> 1) & 0x1f)
|
|
#define __swp_offset(x) ((x).val >> 8)
|
|
#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
|
|
#define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
|
|
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
|
|
|
|
void vmalloc_sync_all(void);
|
|
|
|
#endif /* _I386_PGTABLE_2LEVEL_H */
|