x86: page.h: move and unify types for pagetable entry

# HG changeset patch
# User Jeremy Fitzhardinge <jeremy@xensource.com>
# Date 1199319654 28800
# Node ID 3bd7db6e85e66e7f3362874802df26a82fcb2d92
# Parent  f7e7db3facd9406545103164f9be8f9ba1a2b549
x86: page.h: move and unify types for pagetable entry definitions

This patch:

1. Defines arch-specific types for the contents of a pagetable entry.
That is, 32-bit entries for 32-bit non-PAE, and 64-bit entries for
32-bit PAE and 64-bit.  However, even though the latter two are the
same size, they're defined with different types in order to retain
compatibility with printk format strings, etc.

2. Defines arch-specific pte_t.  This is different because 32-bit PAE
defines it in two halves, whereas 32-bit PAE and 64-bit define it as a
single entry.  All the other pagetable levels can be defined in a
common way.  This also defines arch-specific pte_val/make_pte functions.

3. Define PAGETABLE_LEVELS for each architecture variation, for later use.

4. Define common pagetable entry accessors in a paravirt-compatible
way. (64-bit does not yet use paravirt-ops in any way).

5. Convert a few instances of using a *_val() as an lvalue where it is
no longer a macro.  There are still places in the 64-bit code which
use pte_val() as an lvalue.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 48 insertions, 2 deletions

diff --git a/include/asm-x86/page.h b/include/asm-x86/page.h
index 014f087d7c27..00353eb5666d 100644
--- a/include/asm-x86/page.h
+++ b/include/asm-x86/page.h
@@ -116,9 +116,57 @@ typedef struct { pteval_t pte; } pte_t;
 #ifdef CONFIG_X86_PAE
 #define __PHYSICAL_MASK_SHIFT	36
 #define __VIRTUAL_MASK_SHIFT	32
+#define PAGETABLE_LEVELS	3
+
+#ifndef __ASSEMBLY__
+typedef u64	pteval_t;
+typedef u64	pmdval_t;
+typedef u64	pudval_t;
+typedef u64	pgdval_t;
+typedef u64	pgprotval_t;
+typedef u64	phys_addr_t;
+
+typedef struct { unsigned long pte_low, pte_high; } pte_t;
+
+static inline unsigned long long native_pte_val(pte_t pte)
+{
+	return pte.pte_low | ((unsigned long long)pte.pte_high << 32);
+}
+
+static inline pte_t native_make_pte(unsigned long long val)
+{
+	return (pte_t) { .pte_low = val, .pte_high = (val >> 32) } ;
+}
+
+#endif	/* __ASSEMBLY__
+ */
 #else  /* !CONFIG_X86_PAE */
 #define __PHYSICAL_MASK_SHIFT	32
 #define __VIRTUAL_MASK_SHIFT	32
+#define PAGETABLE_LEVELS	2
+
+#ifndef __ASSEMBLY__
+typedef unsigned long	pteval_t;
+typedef unsigned long	pmdval_t;
+typedef unsigned long	pudval_t;
+typedef unsigned long	pgdval_t;
+typedef unsigned long	pgprotval_t;
+typedef unsigned long	phys_addr_t;
+
+typedef struct { pteval_t pte_low; } pte_t;
+typedef pte_t boot_pte_t;
+
+static inline unsigned long native_pte_val(pte_t pte)
+{
+	return pte.pte_low;
+}
+
+static inline pte_t native_make_pte(unsigned long val)
+{
+	return (pte_t) { .pte_low = val };
+}
+
+#endif	/* __ASSEMBLY__ */
 #endif	/* CONFIG_X86_PAE */
 
 #ifdef CONFIG_HUGETLB_PAGE
@@ -181,7 +229,6 @@ static void inline copy_user_page(void *to, void *from, unsigned long vaddr,
 	alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr)
 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
 
-#ifdef CONFIG_X86_64
 typedef struct { pgdval_t pgd; } pgd_t;
 typedef struct { pgprotval_t pgprot; } pgprot_t;
 
@@ -252,7 +299,6 @@ static inline pmdval_t native_pmd_val(pmd_t pmd)
 
 #endif	/* CONFIG_PARAVIRT */
 
-#endif /* CONFIG_X86_64 */
 #endif	/* __ASSEMBLY__ */