patch-2.3.25 linux/include/asm-arm/proc-armo/pgtable.h

• Lines: 299
• Date: Thu Oct 28 10:16:02 1999
• Orig file: v2.3.24/linux/include/asm-arm/proc-armo/pgtable.h
• Orig date: Fri Oct 22 13:21:53 1999

diff -u --recursive --new-file v2.3.24/linux/include/asm-arm/proc-armo/pgtable.h linux/include/asm-arm/proc-armo/pgtable.h
@@ -9,31 +9,46 @@
 #define __ASM_PROC_PGTABLE_H
 
 /*
- * PMD_SHIFT determines the size of the area a second-level page table can map
+ * entries per page directory level: they are two-level, so
+ * we don't really have any PMD directory.
  */
-#define PMD_SHIFT       20
-#define PMD_SIZE        (1UL << PMD_SHIFT)
-#define PMD_MASK        (~(PMD_SIZE-1))
+#define PTRS_PER_PTE		32
+#define PTRS_PER_PMD		1
+#define PTRS_PER_PGD		32
 
 /*
- * PGDIR_SHIFT determines what a third-level page table entry can map
+ * The vmalloc() routines leaves a hole of 4kB between each vmalloced
+ * area for the same reason. ;)
  */
-#define PGDIR_SHIFT     20
-#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
-#define PGDIR_MASK      (~(PGDIR_SIZE-1))
+#define VMALLOC_START	  0x01a00000
+#define VMALLOC_VMADDR(x) ((unsigned long)(x))
+#define VMALLOC_END	  0x01c00000
 
-/*
- * entries per page directory level: the arm3 is one-level, so
- * we don't really have any PMD or PTE directory physically.
- */
-#define PTRS_PER_PTE    32
-#define PTRS_PER_PMD    1
-#define PTRS_PER_PGD    32
-#define USER_PTRS_PER_PGD	(TASK_SIZE/PGDIR_SIZE)
+#define _PAGE_TABLE     (0x01)
 
-#define VMALLOC_START	0x01a00000
-#define VMALLOC_VMADDR(x) ((unsigned long)(x))
-#define VMALLOC_END	0x01c00000
+#define pmd_bad(pmd)		((pmd_val(pmd) & 0xfc000002))
+#define set_pmd(pmdp,pmd)	((*(pmdp)) = (pmd))
+
+extern __inline__ pmd_t __mk_pmd(pte_t *ptep, unsigned long prot)
+{
+	unsigned long pte_ptr = (unsigned long)ptep;
+	pmd_t pmd;
+
+	pmd_val(pmd) = __virt_to_phys(pte_ptr) | prot;
+
+	return pmd;
+}
+
+/* these are aliases for the above function */
+#define mk_user_pmd(ptep)	__mk_pmd(ptep, _PAGE_TABLE)
+#define mk_kernel_pmd(ptep)	__mk_pmd(ptep, _PAGE_TABLE)
+
+extern __inline__ unsigned long pmd_page(pmd_t pmd)
+{
+	return __phys_to_virt(pmd_val(pmd) & ~_PAGE_TABLE);
+}
+
+#define set_pte(pteptr, pteval)	((*(pteptr)) = (pteval))
 
 #define _PAGE_PRESENT	0x01
 #define _PAGE_READONLY	0x02
@@ -41,9 +56,6 @@
 #define _PAGE_OLD	0x08
 #define _PAGE_CLEAN	0x10
 
-#define _PAGE_TABLE     (_PAGE_PRESENT)
-#define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_OLD | _PAGE_CLEAN)
-
 /*                               -- present --   -- !dirty --  --- !write ---   ---- !user --- */
 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_CLEAN | _PAGE_READONLY | _PAGE_NOT_USER)
 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_CLEAN                                  )
@@ -51,59 +63,19 @@
 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_CLEAN | _PAGE_READONLY                 )
 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT                                | _PAGE_NOT_USER)
 
-/*
- * The arm can't do page protection for execute, and considers that the same are read.
- * Also, write permissions imply read permissions. This is the closest we can get..
- */
-#define __P000  PAGE_NONE
-#define __P001  PAGE_READONLY
-#define __P010  PAGE_COPY
-#define __P011  PAGE_COPY
-#define __P100  PAGE_READONLY
-#define __P101  PAGE_READONLY
-#define __P110  PAGE_COPY
-#define __P111  PAGE_COPY
-
-#define __S000  PAGE_NONE
-#define __S001  PAGE_READONLY
-#define __S010  PAGE_SHARED
-#define __S011  PAGE_SHARED
-#define __S100  PAGE_READONLY
-#define __S101  PAGE_READONLY
-#define __S110  PAGE_SHARED
-#define __S111  PAGE_SHARED
-
-extern unsigned long physical_start;
-extern unsigned long physical_end;
-
-#define pte_none(pte)		(!pte_val(pte))
-#define pte_present(pte)	(pte_val(pte) & _PAGE_PRESENT)
-#define pte_clear(ptep)		set_pte((ptep), __pte(0))
+#define _PAGE_CHG_MASK	(PAGE_MASK | _PAGE_OLD | _PAGE_CLEAN)
 
-#define pmd_none(pmd)		(!pmd_val(pmd))
-#define pmd_bad(pmd)		((pmd_val(pmd) & 0xfc000002))
-#define pmd_present(pmd)	(pmd_val(pmd) & _PAGE_PRESENT)
-#define pmd_clear(pmdp)		set_pmd(pmdp, __pmd(0))
-
-/*
- * The "pgd_xxx()" functions here are trivial for a folded two-level
- * setup: the pgd is never bad, and a pmd always exists (as it's folded
- * into the pgd entry)
- */
-#define pgd_none(pgd)		(0)
-#define pgd_bad(pgd)		(0)
-#define pgd_present(pgd)	(1)
-#define pgd_clear(pgdp)
 
 /*
  * The following only work if pte_present() is true.
  * Undefined behaviour if not..
  */
-extern inline int pte_read(pte_t pte)           { return !(pte_val(pte) & _PAGE_NOT_USER);     }
-extern inline int pte_write(pte_t pte)          { return !(pte_val(pte) & _PAGE_READONLY);     }
-extern inline int pte_exec(pte_t pte)           { return !(pte_val(pte) & _PAGE_NOT_USER);     }
-extern inline int pte_dirty(pte_t pte)          { return !(pte_val(pte) & _PAGE_CLEAN);        }
-extern inline int pte_young(pte_t pte)          { return !(pte_val(pte) & _PAGE_OLD);          }
+#define pte_present(pte)		(pte_val(pte) & _PAGE_PRESENT)
+#define pte_read(pte)			(!(pte_val(pte) & _PAGE_NOT_USER))
+#define pte_write(pte)			(!(pte_val(pte) & _PAGE_READONLY))
+#define pte_exec(pte)			(!(pte_val(pte) & _PAGE_NOT_USER))
+#define pte_dirty(pte)			(!(pte_val(pte) & _PAGE_CLEAN))
+#define pte_young(pte)			(!(pte_val(pte) & _PAGE_OLD))
 
 extern inline pte_t pte_nocache(pte_t pte)	{ return pte; }
 extern inline pte_t pte_wrprotect(pte_t pte)    { pte_val(pte) |= _PAGE_READONLY;  return pte; }
@@ -118,155 +90,6 @@
 extern inline pte_t pte_mkdirty(pte_t pte)      { pte_val(pte) &= ~_PAGE_CLEAN;    return pte; }
 extern inline pte_t pte_mkyoung(pte_t pte)      { pte_val(pte) &= ~_PAGE_OLD;      return pte; }
 
-/*
- * Conversion functions: convert a page and protection to a page entry,
- * and a page entry and page directory to the page they refer to.
- */
-extern __inline__ pte_t mk_pte(unsigned long page, pgprot_t pgprot)
-{
-	pte_t pte;
-	pte_val(pte) = __virt_to_phys(page) | pgprot_val(pgprot);
-	return pte;
-}
-
-/* This takes a physical page address that is used by the remapping functions */
-extern __inline__ pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot)
-{
-	pte_t pte;
-	pte_val(pte) = physpage + pgprot_val(pgprot);
-	return pte;
-}
-
-extern __inline__ pte_t pte_modify(pte_t pte, pgprot_t newprot)
-{
-	pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
-	return pte;
-}
-
-/* Certain architectures need to do special things when pte's
- * within a page table are directly modified.  Thus, the following
- * hook is made available.
- */
-#define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))
-
-extern __inline__ unsigned long pte_page(pte_t pte)
-{
-	return __phys_to_virt(pte_val(pte) & PAGE_MASK);
-}
-
-extern __inline__ pmd_t mk_pmd(pte_t *ptep)
-{
-	pmd_t pmd;
-	pmd_val(pmd) = __virt_to_phys((unsigned long)ptep) | _PAGE_TABLE;
-	return pmd;
-}
-
-/* these are aliases for the above function */
-#define mk_user_pmd(ptep)   mk_pmd(ptep)
-#define mk_kernel_pmd(ptep) mk_pmd(ptep)
-
-#define set_pmd(pmdp,pmd) ((*(pmdp)) = (pmd))
-
-extern __inline__ unsigned long pmd_page(pmd_t pmd)
-{
-	return __phys_to_virt(pmd_val(pmd) & ~_PAGE_TABLE);
-}
-
-/* to find an entry in a kernel page-table-directory */
-#define pgd_offset_k(address) pgd_offset(&init_mm, address)
-
-/* to find an entry in a page-table-directory */
-extern __inline__ pgd_t * pgd_offset(struct mm_struct * mm, unsigned long address)
-{
-        return mm->pgd + (address >> PGDIR_SHIFT);
-}
-
-/* Find an entry in the second-level page table.. */
-#define pmd_offset(dir, address) ((pmd_t *)(dir))
-
-/* Find an entry in the third-level page table.. */
-extern __inline__ pte_t * pte_offset(pmd_t *dir, unsigned long address)
-{
-	return (pte_t *)pmd_page(*dir) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
-}
-
-/*
- * Allocate and free page tables. The xxx_kernel() versions are
- * used to allocate a kernel page table - this turns on ASN bits
- * if any.
- */
-
-extern void free_table(void *table);
-
-/* keep this as an inline so we get type checking */
-extern __inline__ void free_pgd_slow(pgd_t *pgd)
-{
-	free_table(pgd);
-}
-
-/* keep this as an inline so we get type checking */
-extern __inline__ void free_pte_slow(pte_t *pte)
-{
-	free_table(pte);
-}
-
-extern __inline__ void free_pmd_slow(pmd_t *pmd)
-{
-}
-
-#define pgd_free(pgd)           free_pgd_fast(pgd)
-
-extern __inline__ pgd_t *pgd_alloc(void)
-{
-	extern pgd_t *get_pgd_slow(void);
-	pgd_t *pgd;
-
-	pgd = get_pgd_fast();
-	if (!pgd)
-		pgd = get_pgd_slow();
-
-	return pgd;
-}
-
-#define pte_free_kernel(pte)    free_pte_fast(pte)
-#define pte_free(pte)           free_pte_fast(pte)
-
-extern __inline__ pte_t *pte_alloc(pmd_t * pmd, unsigned long address)
-{
-	extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long address_preadjusted);
-
-	address = (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
-
-	if (pmd_none (*pmd)) {
-		pte_t *page = (pte_t *) get_pte_fast();
-
-		if (!page)
-			return get_pte_slow(pmd, address);
-		set_pmd(pmd, mk_pmd(page));
-		return page + address;
-	}
-	if (pmd_bad (*pmd)) {
-		__bad_pmd(pmd);
-		return NULL;
-	}
-	return (pte_t *) pmd_page(*pmd) + address;
-}
-
-/*
- * allocating and freeing a pmd is trivial: the 1-entry pmd is
- * inside the pgd, so has no extra memory associated with it.
- */
-extern __inline__ void pmd_free(pmd_t *pmd)
-{
-}
-
-extern __inline__ pmd_t *pmd_alloc(pgd_t *pgd, unsigned long address)
-{
-	return (pmd_t *) pgd;
-}
-
-#define pmd_free_kernel         pmd_free
-#define pmd_alloc_kernel        pmd_alloc
 #define pte_alloc_kernel        pte_alloc
 
 #endif /* __ASM_PROC_PGTABLE_H */