[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/page.h b/include/asm-i386/page.h
index fd3f64a..818ac8b 100644
--- a/include/asm-i386/page.h
+++ b/include/asm-i386/page.h
@@ -12,7 +12,6 @@
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
-
#ifdef CONFIG_X86_USE_3DNOW
#include <asm/mmx.h>
@@ -42,26 +41,81 @@
* These are used to make use of C type-checking..
*/
extern int nx_enabled;
+
#ifdef CONFIG_X86_PAE
extern unsigned long long __supported_pte_mask;
typedef struct { unsigned long pte_low, pte_high; } pte_t;
typedef struct { unsigned long long pmd; } pmd_t;
typedef struct { unsigned long long pgd; } pgd_t;
typedef struct { unsigned long long pgprot; } pgprot_t;
-#define pmd_val(x) ((x).pmd)
-#define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
-#define __pmd(x) ((pmd_t) { (x) } )
+
+static inline unsigned long long native_pgd_val(pgd_t pgd)
+{
+ return pgd.pgd;
+}
+
+static inline unsigned long long native_pmd_val(pmd_t pmd)
+{
+ return pmd.pmd;
+}
+
+static inline unsigned long long native_pte_val(pte_t pte)
+{
+ return pte.pte_low | ((unsigned long long)pte.pte_high << 32);
+}
+
+static inline pgd_t native_make_pgd(unsigned long long val)
+{
+ return (pgd_t) { val };
+}
+
+static inline pmd_t native_make_pmd(unsigned long long val)
+{
+ return (pmd_t) { val };
+}
+
+static inline pte_t native_make_pte(unsigned long long val)
+{
+ return (pte_t) { .pte_low = val, .pte_high = (val >> 32) } ;
+}
+
+#ifndef CONFIG_PARAVIRT
+#define pmd_val(x) native_pmd_val(x)
+#define __pmd(x) native_make_pmd(x)
+#endif
+
#define HPAGE_SHIFT 21
#include <asm-generic/pgtable-nopud.h>
-#else
+#else /* !CONFIG_X86_PAE */
typedef struct { unsigned long pte_low; } pte_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
#define boot_pte_t pte_t /* or would you rather have a typedef */
-#define pte_val(x) ((x).pte_low)
+
+static inline unsigned long native_pgd_val(pgd_t pgd)
+{
+ return pgd.pgd;
+}
+
+static inline unsigned long native_pte_val(pte_t pte)
+{
+ return pte.pte_low;
+}
+
+static inline pgd_t native_make_pgd(unsigned long val)
+{
+ return (pgd_t) { val };
+}
+
+static inline pte_t native_make_pte(unsigned long val)
+{
+ return (pte_t) { .pte_low = val };
+}
+
#define HPAGE_SHIFT 22
#include <asm-generic/pgtable-nopmd.h>
-#endif
+#endif /* CONFIG_X86_PAE */
+
#define PTE_MASK PAGE_MASK
#ifdef CONFIG_HUGETLB_PAGE
@@ -71,13 +125,16 @@
#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
#endif
-#define pgd_val(x) ((x).pgd)
#define pgprot_val(x) ((x).pgprot)
-
-#define __pte(x) ((pte_t) { (x) } )
-#define __pgd(x) ((pgd_t) { (x) } )
#define __pgprot(x) ((pgprot_t) { (x) } )
+#ifndef CONFIG_PARAVIRT
+#define pgd_val(x) native_pgd_val(x)
+#define __pgd(x) native_make_pgd(x)
+#define pte_val(x) native_pte_val(x)
+#define __pte(x) native_make_pte(x)
+#endif
+
#endif /* !__ASSEMBLY__ */
/* to align the pointer to the (next) page boundary */