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linux-cryptodev-2.6/arch/mips/include/asm/pgtable.h
Rick Edgecombe 2f0584f3f4 mm: Rename arch pte_mkwrite()'s to pte_mkwrite_novma() 
The x86 Shadow stack feature includes a new type of memory called shadow
stack. This shadow stack memory has some unusual properties, which requires
some core mm changes to function properly.

One of these unusual properties is that shadow stack memory is writable,
but only in limited ways. These limits are applied via a specific PTE
bit combination. Nevertheless, the memory is writable, and core mm code
will need to apply the writable permissions in the typical paths that
call pte_mkwrite(). The goal is to make pte_mkwrite() take a VMA, so
that the x86 implementation of it can know whether to create regular
writable or shadow stack mappings.

But there are a couple of challenges to this. Modifying the signatures of
each arch pte_mkwrite() implementation would be error prone because some
are generated with macros and would need to be re-implemented. Also, some
pte_mkwrite() callers operate on kernel memory without a VMA.

So this can be done in a three step process. First pte_mkwrite() can be
renamed to pte_mkwrite_novma() in each arch, with a generic pte_mkwrite()
added that just calls pte_mkwrite_novma(). Next callers without a VMA can
be moved to pte_mkwrite_novma(). And lastly, pte_mkwrite() and all callers
can be changed to take/pass a VMA.

Start the process by renaming pte_mkwrite() to pte_mkwrite_novma() and
adding the pte_mkwrite() wrapper in linux/pgtable.h. Apply the same
pattern for pmd_mkwrite(). Since not all archs have a pmd_mkwrite_novma(),
create a new arch config HAS_HUGE_PAGE that can be used to tell if
pmd_mkwrite() should be defined. Otherwise in the !HAS_HUGE_PAGE cases the
compiler would not be able to find pmd_mkwrite_novma().

No functional change.

Suggested-by: Linus Torvalds <torvalds@linuxfoundation.org>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/lkml/CAHk-=wiZjSu7c9sFYZb3q04108stgHff2wfbokGCCgW7riz+8Q@mail.gmail.com/
Link: https://lore.kernel.org/all/20230613001108.3040476-2-rick.p.edgecombe%40intel.com
2023-07-11 14:10:56 -07:00

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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2003 Ralf Baechle
*/
#ifndef _ASM_PGTABLE_H
#define _ASM_PGTABLE_H
#include <linux/mm_types.h>
#include <linux/mmzone.h>
#ifdef CONFIG_32BIT
#include <asm/pgtable-32.h>
#endif
#ifdef CONFIG_64BIT
#include <asm/pgtable-64.h>
#endif
#include <asm/cmpxchg.h>
#include <asm/io.h>
#include <asm/pgtable-bits.h>
#include <asm/cpu-features.h>
struct mm_struct;
struct vm_area_struct;
#define PAGE_SHARED vm_get_page_prot(VM_READ|VM_WRITE|VM_SHARED)
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
_PAGE_GLOBAL | _page_cachable_default)
#define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
_PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
__WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
/*
* If _PAGE_NO_EXEC is not defined, we can't do page protection for
* execute, and consider it to be the same as read. Also, write
* permissions imply read permissions. This is the closest we can get
* by reasonable means..
*/
extern unsigned long _page_cachable_default;
extern void __update_cache(unsigned long address, pte_t pte);
/*
* ZERO_PAGE is a global shared page that is always zero; used
* for zero-mapped memory areas etc..
*/
extern unsigned long empty_zero_page;
extern unsigned long zero_page_mask;
#define ZERO_PAGE(vaddr) \
(virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
#define __HAVE_COLOR_ZERO_PAGE
extern void paging_init(void);
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
*/
#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
static inline unsigned long pmd_pfn(pmd_t pmd)
{
return pmd_val(pmd) >> _PFN_SHIFT;
}
#ifndef CONFIG_MIPS_HUGE_TLB_SUPPORT
#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
#define pmd_page_vaddr(pmd) pmd_val(pmd)
#define htw_stop() \
do { \
unsigned long __flags; \
\
if (cpu_has_htw) { \
local_irq_save(__flags); \
if(!raw_current_cpu_data.htw_seq++) { \
write_c0_pwctl(read_c0_pwctl() & \
~(1 << MIPS_PWCTL_PWEN_SHIFT)); \
back_to_back_c0_hazard(); \
} \
local_irq_restore(__flags); \
} \
} while(0)
#define htw_start() \
do { \
unsigned long __flags; \
\
if (cpu_has_htw) { \
local_irq_save(__flags); \
if (!--raw_current_cpu_data.htw_seq) { \
write_c0_pwctl(read_c0_pwctl() | \
(1 << MIPS_PWCTL_PWEN_SHIFT)); \
back_to_back_c0_hazard(); \
} \
local_irq_restore(__flags); \
} \
} while(0)
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pteval);
#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
#ifdef CONFIG_XPA
# define pte_none(pte) (!(((pte).pte_high) & ~_PAGE_GLOBAL))
#else
# define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
#endif
#define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
#define pte_no_exec(pte) ((pte).pte_low & _PAGE_NO_EXEC)
static inline void set_pte(pte_t *ptep, pte_t pte)
{
ptep->pte_high = pte.pte_high;
smp_wmb();
ptep->pte_low = pte.pte_low;
#ifdef CONFIG_XPA
if (pte.pte_high & _PAGE_GLOBAL) {
#else
if (pte.pte_low & _PAGE_GLOBAL) {
#endif
pte_t *buddy = ptep_buddy(ptep);
/*
* Make sure the buddy is global too (if it's !none,
* it better already be global)
*/
if (pte_none(*buddy)) {
if (!IS_ENABLED(CONFIG_XPA))
buddy->pte_low |= _PAGE_GLOBAL;
buddy->pte_high |= _PAGE_GLOBAL;
}
}
}
static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
pte_t null = __pte(0);
htw_stop();
/* Preserve global status for the pair */
if (IS_ENABLED(CONFIG_XPA)) {
if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
null.pte_high = _PAGE_GLOBAL;
} else {
if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
null.pte_low = null.pte_high = _PAGE_GLOBAL;
}
set_pte_at(mm, addr, ptep, null);
htw_start();
}
#else
#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
#define pte_no_exec(pte) (pte_val(pte) & _PAGE_NO_EXEC)
/*
* Certain architectures need to do special things when pte's
* within a page table are directly modified. Thus, the following
* hook is made available.
*/
static inline void set_pte(pte_t *ptep, pte_t pteval)
{
*ptep = pteval;
#if !defined(CONFIG_CPU_R3K_TLB)
if (pte_val(pteval) & _PAGE_GLOBAL) {
pte_t *buddy = ptep_buddy(ptep);
/*
* Make sure the buddy is global too (if it's !none,
* it better already be global)
*/
# if defined(CONFIG_PHYS_ADDR_T_64BIT) && !defined(CONFIG_CPU_MIPS32)
cmpxchg64(&buddy->pte, 0, _PAGE_GLOBAL);
# else
cmpxchg(&buddy->pte, 0, _PAGE_GLOBAL);
# endif
}
#endif
}
static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
htw_stop();
#if !defined(CONFIG_CPU_R3K_TLB)
/* Preserve global status for the pair */
if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
else
#endif
set_pte_at(mm, addr, ptep, __pte(0));
htw_start();
}
#endif
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pteval)
{
if (!pte_present(pteval))
goto cache_sync_done;
if (pte_present(*ptep) && (pte_pfn(*ptep) == pte_pfn(pteval)))
goto cache_sync_done;
__update_cache(addr, pteval);
cache_sync_done:
set_pte(ptep, pteval);
}
/*
* (pmds are folded into puds so this doesn't get actually called,
* but the define is needed for a generic inline function.)
*/
#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
#ifndef __PAGETABLE_PMD_FOLDED
/*
* (puds are folded into pgds so this doesn't get actually called,
* but the define is needed for a generic inline function.)
*/
#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
#endif
#define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
#define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
#define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
/*
* We used to declare this array with size but gcc 3.3 and older are not able
* to find that this expression is a constant, so the size is dropped.
*/
extern pgd_t swapper_pg_dir[];
/*
* Platform specific pte_special() and pte_mkspecial() definitions
* are required only when ARCH_HAS_PTE_SPECIAL is enabled.
*/
#if defined(CONFIG_ARCH_HAS_PTE_SPECIAL)
#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
static inline int pte_special(pte_t pte)
{
return pte.pte_low & _PAGE_SPECIAL;
}
static inline pte_t pte_mkspecial(pte_t pte)
{
pte.pte_low |= _PAGE_SPECIAL;
return pte;
}
#else
static inline int pte_special(pte_t pte)
{
return pte_val(pte) & _PAGE_SPECIAL;
}
static inline pte_t pte_mkspecial(pte_t pte)
{
pte_val(pte) |= _PAGE_SPECIAL;
return pte;
}
#endif
#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
*/
#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
static inline pte_t pte_wrprotect(pte_t pte)
{
pte.pte_low &= ~_PAGE_WRITE;
if (!IS_ENABLED(CONFIG_XPA))
pte.pte_low &= ~_PAGE_SILENT_WRITE;
pte.pte_high &= ~_PAGE_SILENT_WRITE;
return pte;
}
static inline pte_t pte_mkclean(pte_t pte)
{
pte.pte_low &= ~_PAGE_MODIFIED;
if (!IS_ENABLED(CONFIG_XPA))
pte.pte_low &= ~_PAGE_SILENT_WRITE;
pte.pte_high &= ~_PAGE_SILENT_WRITE;
return pte;
}
static inline pte_t pte_mkold(pte_t pte)
{
pte.pte_low &= ~_PAGE_ACCESSED;
if (!IS_ENABLED(CONFIG_XPA))
pte.pte_low &= ~_PAGE_SILENT_READ;
pte.pte_high &= ~_PAGE_SILENT_READ;
return pte;
}
static inline pte_t pte_mkwrite_novma(pte_t pte)
{
pte.pte_low |= _PAGE_WRITE;
if (pte.pte_low & _PAGE_MODIFIED) {
if (!IS_ENABLED(CONFIG_XPA))
pte.pte_low |= _PAGE_SILENT_WRITE;
pte.pte_high |= _PAGE_SILENT_WRITE;
}
return pte;
}
static inline pte_t pte_mkdirty(pte_t pte)
{
pte.pte_low |= _PAGE_MODIFIED;
if (pte.pte_low & _PAGE_WRITE) {
if (!IS_ENABLED(CONFIG_XPA))
pte.pte_low |= _PAGE_SILENT_WRITE;
pte.pte_high |= _PAGE_SILENT_WRITE;
}
return pte;
}
static inline pte_t pte_mkyoung(pte_t pte)
{
pte.pte_low |= _PAGE_ACCESSED;
if (!(pte.pte_low & _PAGE_NO_READ)) {
if (!IS_ENABLED(CONFIG_XPA))
pte.pte_low |= _PAGE_SILENT_READ;
pte.pte_high |= _PAGE_SILENT_READ;
}
return pte;
}
#else
static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
static inline pte_t pte_wrprotect(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
return pte;
}
static inline pte_t pte_mkclean(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
return pte;
}
static inline pte_t pte_mkold(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
return pte;
}
static inline pte_t pte_mkwrite_novma(pte_t pte)
{
pte_val(pte) |= _PAGE_WRITE;
if (pte_val(pte) & _PAGE_MODIFIED)
pte_val(pte) |= _PAGE_SILENT_WRITE;
return pte;
}
static inline pte_t pte_mkdirty(pte_t pte)
{
pte_val(pte) |= _PAGE_MODIFIED | _PAGE_SOFT_DIRTY;
if (pte_val(pte) & _PAGE_WRITE)
pte_val(pte) |= _PAGE_SILENT_WRITE;
return pte;
}
static inline pte_t pte_mkyoung(pte_t pte)
{
pte_val(pte) |= _PAGE_ACCESSED;
if (!(pte_val(pte) & _PAGE_NO_READ))
pte_val(pte) |= _PAGE_SILENT_READ;
return pte;
}
#define pte_sw_mkyoung pte_mkyoung
#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
static inline pte_t pte_mkhuge(pte_t pte)
{
pte_val(pte) |= _PAGE_HUGE;
return pte;
}
#define pmd_write pmd_write
static inline int pmd_write(pmd_t pmd)
{
return !!(pmd_val(pmd) & _PAGE_WRITE);
}
static inline struct page *pmd_page(pmd_t pmd)
{
if (pmd_val(pmd) & _PAGE_HUGE)
return pfn_to_page(pmd_pfn(pmd));
return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
}
#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
static inline bool pte_soft_dirty(pte_t pte)
{
return pte_val(pte) & _PAGE_SOFT_DIRTY;
}
#define pte_swp_soft_dirty pte_soft_dirty
static inline pte_t pte_mksoft_dirty(pte_t pte)
{
pte_val(pte) |= _PAGE_SOFT_DIRTY;
return pte;
}
#define pte_swp_mksoft_dirty pte_mksoft_dirty
static inline pte_t pte_clear_soft_dirty(pte_t pte)
{
pte_val(pte) &= ~(_PAGE_SOFT_DIRTY);
return pte;
}
#define pte_swp_clear_soft_dirty pte_clear_soft_dirty
#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
#endif
/*
* Macro to make mark a page protection value as "uncacheable". Note
* that "protection" is really a misnomer here as the protection value
* contains the memory attribute bits, dirty bits, and various other
* bits as well.
*/
#define pgprot_noncached pgprot_noncached
static inline pgprot_t pgprot_noncached(pgprot_t _prot)
{
unsigned long prot = pgprot_val(_prot);
prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
return __pgprot(prot);
}
#define pgprot_writecombine pgprot_writecombine
static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
{
unsigned long prot = pgprot_val(_prot);
/* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;
return __pgprot(prot);
}
static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma,
unsigned long address,
pte_t *ptep)
{
}
#define __HAVE_ARCH_PTE_SAME
static inline int pte_same(pte_t pte_a, pte_t pte_b)
{
return pte_val(pte_a) == pte_val(pte_b);
}
#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
static inline int ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep,
pte_t entry, int dirty)
{
if (!pte_same(*ptep, entry))
set_pte_at(vma->vm_mm, address, ptep, entry);
/*
* update_mmu_cache will unconditionally execute, handling both
* the case that the PTE changed and the spurious fault case.
*/
return true;
}
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
*/
#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
#if defined(CONFIG_XPA)
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
pte.pte_low &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
pte.pte_low |= pgprot_val(newprot) & ~_PFNX_MASK;
pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
return pte;
}
#elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
pte.pte_low &= _PAGE_CHG_MASK;
pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
pte.pte_low |= pgprot_val(newprot);
pte.pte_high |= pgprot_val(newprot) & ~(_PFN_MASK | _CACHE_MASK);
return pte;
}
#else
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
pte_val(pte) &= _PAGE_CHG_MASK;
pte_val(pte) |= pgprot_val(newprot) & ~_PAGE_CHG_MASK;
if ((pte_val(pte) & _PAGE_ACCESSED) && !(pte_val(pte) & _PAGE_NO_READ))
pte_val(pte) |= _PAGE_SILENT_READ;
return pte;
}
#endif
#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
static inline int pte_swp_exclusive(pte_t pte)
{
return pte.pte_low & _PAGE_SWP_EXCLUSIVE;
}
static inline pte_t pte_swp_mkexclusive(pte_t pte)
{
pte.pte_low |= _PAGE_SWP_EXCLUSIVE;
return pte;
}
static inline pte_t pte_swp_clear_exclusive(pte_t pte)
{
pte.pte_low &= ~_PAGE_SWP_EXCLUSIVE;
return pte;
}
#else
static inline int pte_swp_exclusive(pte_t pte)
{
return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
}
static inline pte_t pte_swp_mkexclusive(pte_t pte)
{
pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
return pte;
}
static inline pte_t pte_swp_clear_exclusive(pte_t pte)
{
pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
return pte;
}
#endif
extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
pte_t pte);
static inline void update_mmu_cache(struct vm_area_struct *vma,
unsigned long address, pte_t *ptep)
{
pte_t pte = *ptep;
__update_tlb(vma, address, pte);
}
#define __HAVE_ARCH_UPDATE_MMU_TLB
#define update_mmu_tlb update_mmu_cache
static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
{
pte_t pte = *(pte_t *)pmdp;
__update_tlb(vma, address, pte);
}
/*
* Allow physical addresses to be fixed up to help 36-bit peripherals.
*/
#ifdef CONFIG_MIPS_FIXUP_BIGPHYS_ADDR
phys_addr_t fixup_bigphys_addr(phys_addr_t addr, phys_addr_t size);
int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long vaddr,
unsigned long pfn, unsigned long size, pgprot_t prot);
#define io_remap_pfn_range io_remap_pfn_range
#else
#define fixup_bigphys_addr(addr, size) (addr)
#endif /* CONFIG_MIPS_FIXUP_BIGPHYS_ADDR */
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/* We don't have hardware dirty/accessed bits, generic_pmdp_establish is fine.*/
#define pmdp_establish generic_pmdp_establish
#define has_transparent_hugepage has_transparent_hugepage
extern int has_transparent_hugepage(void);
static inline int pmd_trans_huge(pmd_t pmd)
{
return !!(pmd_val(pmd) & _PAGE_HUGE);
}
static inline pmd_t pmd_mkhuge(pmd_t pmd)
{
pmd_val(pmd) |= _PAGE_HUGE;
return pmd;
}
extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, pmd_t pmd);
static inline pmd_t pmd_wrprotect(pmd_t pmd)
{
pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
return pmd;
}
static inline pmd_t pmd_mkwrite_novma(pmd_t pmd)
{
pmd_val(pmd) |= _PAGE_WRITE;
if (pmd_val(pmd) & _PAGE_MODIFIED)
pmd_val(pmd) |= _PAGE_SILENT_WRITE;
return pmd;
}
static inline int pmd_dirty(pmd_t pmd)
{
return !!(pmd_val(pmd) & _PAGE_MODIFIED);
}
static inline pmd_t pmd_mkclean(pmd_t pmd)
{
pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
return pmd;
}
static inline pmd_t pmd_mkdirty(pmd_t pmd)
{
pmd_val(pmd) |= _PAGE_MODIFIED | _PAGE_SOFT_DIRTY;
if (pmd_val(pmd) & _PAGE_WRITE)
pmd_val(pmd) |= _PAGE_SILENT_WRITE;
return pmd;
}
#define pmd_young pmd_young
static inline int pmd_young(pmd_t pmd)
{
return !!(pmd_val(pmd) & _PAGE_ACCESSED);
}
static inline pmd_t pmd_mkold(pmd_t pmd)
{
pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
return pmd;
}
static inline pmd_t pmd_mkyoung(pmd_t pmd)
{
pmd_val(pmd) |= _PAGE_ACCESSED;
if (!(pmd_val(pmd) & _PAGE_NO_READ))
pmd_val(pmd) |= _PAGE_SILENT_READ;
return pmd;
}
#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
static inline int pmd_soft_dirty(pmd_t pmd)
{
return !!(pmd_val(pmd) & _PAGE_SOFT_DIRTY);
}
static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
{
pmd_val(pmd) |= _PAGE_SOFT_DIRTY;
return pmd;
}
static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
{
pmd_val(pmd) &= ~(_PAGE_SOFT_DIRTY);
return pmd;
}
#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
/* Extern to avoid header file madness */
extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
{
pmd_val(pmd) = (pmd_val(pmd) & (_PAGE_CHG_MASK | _PAGE_HUGE)) |
(pgprot_val(newprot) & ~_PAGE_CHG_MASK);
return pmd;
}
static inline pmd_t pmd_mkinvalid(pmd_t pmd)
{
pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);
return pmd;
}
/*
* The generic version pmdp_huge_get_and_clear uses a version of pmd_clear() with a
* different prototype.
*/
#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
unsigned long address, pmd_t *pmdp)
{
pmd_t old = *pmdp;
pmd_clear(pmdp);
return old;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#ifdef _PAGE_HUGE
#define pmd_leaf(pmd) ((pmd_val(pmd) & _PAGE_HUGE) != 0)
#define pud_leaf(pud) ((pud_val(pud) & _PAGE_HUGE) != 0)
#endif
#define gup_fast_permitted(start, end) (!cpu_has_dc_aliases)
/*
* We provide our own get_unmapped area to cope with the virtual aliasing
* constraints placed on us by the cache architecture.
*/
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
#endif /* _ASM_PGTABLE_H */
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