[PATCH] i386: PARAVIRT: Add pagetable accessors to pack and unpack pagetable entries
Add a set of accessors to pack, unpack and modify page table entries
(at all levels). This allows a paravirt implementation to control the
contents of pgd/pmd/pte entries. For example, Xen uses this to
convert the (pseudo-)physical address into a machine address when
populating a pagetable entry, and converting back to pphys address
when an entry is read.
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-i386/pgtable-3level.h b/include/asm-i386/pgtable-3level.h
index 7a2318f..be6017f 100644
--- a/include/asm-i386/pgtable-3level.h
+++ b/include/asm-i386/pgtable-3level.h
@@ -42,20 +42,23 @@
return pte_x(pte);
}
-#ifndef CONFIG_PARAVIRT
/* 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 set_pte(pte_t *ptep, pte_t pte)
+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;
}
-#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+static inline void native_set_pte_at(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep , pte_t pte)
+{
+ native_set_pte(ptep, pte);
+}
/*
* Since this is only called on user PTEs, and the page fault handler
@@ -63,7 +66,8 @@
* we are justified in merely clearing the PTE present bit, followed
* by a set. The ordering here is important.
*/
-static inline void set_pte_present(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
+static inline void native_set_pte_present(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t pte)
{
ptep->pte_low = 0;
smp_wmb();
@@ -72,32 +76,48 @@
ptep->pte_low = pte.pte_low;
}
-#define set_pte_atomic(pteptr,pteval) \
- set_64bit((unsigned long long *)(pteptr),pte_val(pteval))
-#define set_pmd(pmdptr,pmdval) \
- set_64bit((unsigned long long *)(pmdptr),pmd_val(pmdval))
-#define set_pud(pudptr,pudval) \
- (*(pudptr) = (pudval))
+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)
+{
+ *pudp = 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 pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+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 pmd_clear(pmd_t *pmd)
+static inline void native_pmd_clear(pmd_t *pmd)
{
u32 *tmp = (u32 *)pmd;
*tmp = 0;
smp_wmb();
*(tmp + 1) = 0;
}
+
+#ifndef CONFIG_PARAVIRT
+#define set_pte(ptep, pte) native_set_pte(ptep, pte)
+#define set_pte_at(mm, addr, ptep, pte) native_set_pte_at(mm, addr, ptep, pte)
+#define set_pte_present(mm, addr, ptep, pte) native_set_pte_present(mm, addr, ptep, pte)
+#define set_pte_atomic(ptep, pte) native_set_pte_atomic(ptep, pte)
+#define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
+#define set_pud(pudp, pud) native_set_pud(pudp, pud)
+#define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
+#define pmd_clear(pmd) native_pmd_clear(pmd)
#endif
/*
@@ -119,7 +139,7 @@
#define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
pmd_index(address))
-static inline pte_t raw_ptep_get_and_clear(pte_t *ptep)
+static inline pte_t native_ptep_get_and_clear(pte_t *ptep)
{
pte_t res;
@@ -146,28 +166,21 @@
static inline unsigned long pte_pfn(pte_t pte)
{
- return (pte.pte_low >> PAGE_SHIFT) |
- (pte.pte_high << (32 - PAGE_SHIFT));
+ return pte_val(pte) >> PAGE_SHIFT;
}
extern unsigned long long __supported_pte_mask;
static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
{
- pte_t pte;
-
- pte.pte_high = (page_nr >> (32 - PAGE_SHIFT)) | \
- (pgprot_val(pgprot) >> 32);
- pte.pte_high &= (__supported_pte_mask >> 32);
- pte.pte_low = ((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)) & \
- __supported_pte_mask;
- return pte;
+ return __pte((((unsigned long long)page_nr << PAGE_SHIFT) |
+ pgprot_val(pgprot)) & __supported_pte_mask);
}
static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
{
- return __pmd((((unsigned long long)page_nr << PAGE_SHIFT) | \
- pgprot_val(pgprot)) & __supported_pte_mask);
+ return __pmd((((unsigned long long)page_nr << PAGE_SHIFT) |
+ pgprot_val(pgprot)) & __supported_pte_mask);
}
/*