mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 08:45:12 +07:00
f2d6bfe9ff
Add support for transparent hugepages to x86 32bit. Share the same VM_ bitflag for VM_MAPPED_COPY. mm/nommu.c will never support transparent hugepages. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Reviewed-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
112 lines
3.3 KiB
C
112 lines
3.3 KiB
C
#ifndef _ASM_X86_PGTABLE_2LEVEL_H
|
|
#define _ASM_X86_PGTABLE_2LEVEL_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.
|
|
*/
|
|
static inline void native_set_pte(pte_t *ptep , pte_t pte)
|
|
{
|
|
*ptep = pte;
|
|
}
|
|
|
|
static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
|
|
{
|
|
*pmdp = pmd;
|
|
}
|
|
|
|
static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
|
|
{
|
|
native_set_pte(ptep, pte);
|
|
}
|
|
|
|
static inline void native_pmd_clear(pmd_t *pmdp)
|
|
{
|
|
native_set_pmd(pmdp, __pmd(0));
|
|
}
|
|
|
|
static inline void native_pte_clear(struct mm_struct *mm,
|
|
unsigned long addr, pte_t *xp)
|
|
{
|
|
*xp = native_make_pte(0);
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static inline pte_t native_ptep_get_and_clear(pte_t *xp)
|
|
{
|
|
return __pte(xchg(&xp->pte_low, 0));
|
|
}
|
|
#else
|
|
#define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
|
|
{
|
|
return __pmd(xchg((pmdval_t *)xp, 0));
|
|
}
|
|
#else
|
|
#define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp)
|
|
#endif
|
|
|
|
/*
|
|
* Bits _PAGE_BIT_PRESENT, _PAGE_BIT_FILE and _PAGE_BIT_PROTNONE are taken,
|
|
* split up the 29 bits of offset into this range:
|
|
*/
|
|
#define PTE_FILE_MAX_BITS 29
|
|
#define PTE_FILE_SHIFT1 (_PAGE_BIT_PRESENT + 1)
|
|
#if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
|
|
#define PTE_FILE_SHIFT2 (_PAGE_BIT_FILE + 1)
|
|
#define PTE_FILE_SHIFT3 (_PAGE_BIT_PROTNONE + 1)
|
|
#else
|
|
#define PTE_FILE_SHIFT2 (_PAGE_BIT_PROTNONE + 1)
|
|
#define PTE_FILE_SHIFT3 (_PAGE_BIT_FILE + 1)
|
|
#endif
|
|
#define PTE_FILE_BITS1 (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1)
|
|
#define PTE_FILE_BITS2 (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1)
|
|
|
|
#define pte_to_pgoff(pte) \
|
|
((((pte).pte_low >> PTE_FILE_SHIFT1) \
|
|
& ((1U << PTE_FILE_BITS1) - 1)) \
|
|
+ ((((pte).pte_low >> PTE_FILE_SHIFT2) \
|
|
& ((1U << PTE_FILE_BITS2) - 1)) << PTE_FILE_BITS1) \
|
|
+ (((pte).pte_low >> PTE_FILE_SHIFT3) \
|
|
<< (PTE_FILE_BITS1 + PTE_FILE_BITS2)))
|
|
|
|
#define pgoff_to_pte(off) \
|
|
((pte_t) { .pte_low = \
|
|
(((off) & ((1U << PTE_FILE_BITS1) - 1)) << PTE_FILE_SHIFT1) \
|
|
+ ((((off) >> PTE_FILE_BITS1) & ((1U << PTE_FILE_BITS2) - 1)) \
|
|
<< PTE_FILE_SHIFT2) \
|
|
+ (((off) >> (PTE_FILE_BITS1 + PTE_FILE_BITS2)) \
|
|
<< PTE_FILE_SHIFT3) \
|
|
+ _PAGE_FILE })
|
|
|
|
/* Encode and de-code a swap entry */
|
|
#if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
|
|
#define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
|
|
#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
|
|
#else
|
|
#define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
|
|
#define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
|
|
#endif
|
|
|
|
#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
|
|
|
|
#define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
|
|
& ((1U << SWP_TYPE_BITS) - 1))
|
|
#define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT)
|
|
#define __swp_entry(type, offset) ((swp_entry_t) { \
|
|
((type) << (_PAGE_BIT_PRESENT + 1)) \
|
|
| ((offset) << SWP_OFFSET_SHIFT) })
|
|
#define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
|
|
#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
|
|
|
|
#endif /* _ASM_X86_PGTABLE_2LEVEL_H */
|