patch-1.3.48 linux/include/asm-mips/page.h

• Lines: 284
• Date: Wed Dec 13 12:39:46 1995
• Orig file: v1.3.47/linux/include/asm-mips/page.h
• Orig date: Wed Nov 8 07:11:41 1995

diff -u --recursive --new-file v1.3.47/linux/include/asm-mips/page.h linux/include/asm-mips/page.h
@@ -1,36 +1,33 @@
 #ifndef __ASM_MIPS_PAGE_H
 #define __ASM_MIPS_PAGE_H
 
-#define STRICT_MM_TYPECHECKS
-
-#ifndef __ASSEMBLY__
-
-#include <linux/linkage.h>
+/* PAGE_SHIFT determines the page size */
+#define PAGE_SHIFT	12
+#define PAGE_SIZE	(1UL << PAGE_SHIFT)
+#define PAGE_MASK	(~(PAGE_SIZE-1))
 
-#define invalidate()	tlbflush();
-extern asmlinkage void tlbflush(void);
+#ifdef __KERNEL__
 
-/* 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))
+#define STRICT_MM_TYPECHECKS
 
-typedef unsigned short mem_map_t;
+#ifndef __LANGUAGE_ASSEMBLY__
 
 #ifdef STRICT_MM_TYPECHECKS
 /*
  * These are used to make use of C type-checking..
  */
 typedef struct { unsigned long pte; } pte_t;
+typedef struct { unsigned long pmd; } pmd_t;
 typedef struct { unsigned long pgd; } pgd_t;
 typedef struct { unsigned long pgprot; } pgprot_t;
 
 #define pte_val(x)	((x).pte)
+#define pmd_val(x)	((x).pmd)
 #define pgd_val(x)	((x).pgd)
 #define pgprot_val(x)	((x).pgprot)
 
 #define __pte(x)	((pte_t) { (x) } )
+#define __pme(x)	((pme_t) { (x) } )
 #define __pgd(x)	((pgd_t) { (x) } )
 #define __pgprot(x)	((pgprot_t) { (x) } )
 
@@ -39,202 +36,67 @@
  * .. while these make it easier on the compiler
  */
 typedef unsigned long pte_t;
+typedef unsigned long pmd_t;
 typedef unsigned long pgd_t;
 typedef unsigned long pgprot_t;
 
 #define pte_val(x)	(x)
+#define pmd_val(x)	(x)
 #define pgd_val(x)	(x)
 #define pgprot_val(x)	(x)
 
 #define __pte(x)	(x)
+#define __pmd(x)	(x)
 #define __pgd(x)	(x)
 #define __pgprot(x)	(x)
 
 #endif /* !defined (STRICT_MM_TYPECHECKS) */
-#endif /* __ASSEMBLY__ */
-
-/*
- * Note that we shift the lower 32bits of each EntryLo[01] entry
- * 6 bits to the left. That way we can convert the PFN into the
- * physical address by a single 'and' operation and gain 6 additional
- * bits for storing information which isn't present in a normal
- * MIPS page table.
- */
-#define _PAGE_PRESENT               (1<<0)  /* implemented in software */
-#define _PAGE_COW                   (1<<1)  /* implemented in software */
-#define _PAGE_DIRTY                 (1<<2)  /* implemented in software */
-#define _PAGE_USER                  (1<<3)
-#define _PAGE_UNUSED1               (1<<4)
-#define _PAGE_UNUSED2               (1<<5)
-#define _PAGE_GLOBAL                (1<<6)
-#define _PAGE_ACCESSED              (1<<7)   /* The MIPS valid bit      */
-#define _PAGE_RW                    (1<<8)   /* The MIPS dirty bit      */
-#define _CACHE_CACHABLE_NO_WA       (0<<9)
-#define _CACHE_CACHABLE_WA          (1<<9)
-#define _CACHE_UNCACHED             (2<<9)
-#define _CACHE_CACHABLE_NONCOHERENT (3<<9)
-#define _CACHE_CACHABLE_CE          (4<<9)
-#define _CACHE_CACHABLE_COW         (5<<9)
-#define _CACHE_CACHABLE_CUW         (6<<9)
-#define _CACHE_MASK                 (7<<9)
-
-#define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY | \
-                         _CACHE_CACHABLE_NO_WA)
-
-#define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _CACHE_MASK)
-
-#define PAGE_NONE	__pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
-#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _CACHE_CACHABLE_NO_WA)
-#define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_COW | _CACHE_CACHABLE_NO_WA)
-#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _CACHE_CACHABLE_NO_WA)
-#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
-
-/*
- * MIPS can't do page protection for execute, and considers that the same like
- * read. Also, write permissions imply read permissions. This is the closest
- * we can get by reasonable means..
- */
-#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
-
-/* PAGE_SHIFT determines the page size */
-#define PAGE_SHIFT			12
-#define PGDIR_SHIFT			22
-#define PAGE_SIZE			(1UL << PAGE_SHIFT)
-#define PGDIR_SIZE			(1UL << PGDIR_SHIFT)
-
-#ifdef __KERNEL__
-
-#define PAGE_OFFSET	KERNELBASE
-#define MAP_NR(addr)	(((addr) - PAGE_OFFSET) >> PAGE_SHIFT)
-#define MAP_PAGE_RESERVED (1<<15)
-
-#if !defined (__ASSEMBLY__)
-
-/* page table for 0-4MB for everybody */
-extern unsigned long pg0[1024];
 
 /*
- * BAD_PAGETABLE is used when we need a bogus page-table, while
- * BAD_PAGE is used for a bogus page.
- *
- * ZERO_PAGE is a global shared page that is always zero: used
- * for zero-mapped memory areas etc..
+ * We need a special version of copy_page that can handle virtual caches.
+ * While we're at tweaking with caches we can use that to make it even
+ * faster.  The R10000 accelerated caching mode will further accelerate it.
  */
-extern pte_t __bad_page(void);
-extern pte_t * __bad_pagetable(void);
-
-extern unsigned long __zero_page(void);
+extern void __copy_page(unsigned long from, unsigned long to);
+#define copy_page(from,to) __copy_page((unsigned long)from, (unsigned long)to)
 
-#define BAD_PAGETABLE __bad_pagetable()
-#define BAD_PAGE __bad_page()
-#define ZERO_PAGE __zero_page()
-
-/* number of bits that fit into a memory pointer */
-#define BITS_PER_PTR			(8*sizeof(unsigned long))
-
-/* to mask away the intra-page address bits */
-#define PAGE_MASK			(~(PAGE_SIZE-1))
-
-/* to mask away the intra-page address bits */
-#define PGDIR_MASK			(~(PGDIR_SIZE-1))
+#endif /* __LANGUAGE_ASSEMBLY__ */
 
 /* to align the pointer to the (next) page boundary */
-#define PAGE_ALIGN(addr)		(((addr)+PAGE_SIZE-1)&PAGE_MASK)
-
-/* to align the pointer to a pointer address */
-#define PTR_MASK			(~(sizeof(void*)-1))
-
-/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
-/* 64-bit machines, beware!  SRB. */
-#define SIZEOF_PTR_LOG2			2
-
-/* to find an entry in a page-table-directory */
-#define PAGE_DIR_OFFSET(tsk,address) \
-((((unsigned long)(address)) >> PGDIR_SHIFT) + (pgd_t *) (tsk)->tss.pg_dir)
-
-/* to find an entry in a page-table */
-#define PAGE_PTR(address) \
-((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)
-
-/* the no. of pointers that fit on a page */
-#define PTRS_PER_PAGE			(PAGE_SIZE/sizeof(void*))
-
-/* to set the page-dir */
-#define SET_PAGE_DIR(tsk,pgdir) \
-do { \
-	(tsk)->tss.pg_dir = (unsigned long) (pgdir); \
-	if ((tsk) == current) \
-		invalidate(); \
-} while (0)
-
-extern unsigned long high_memory;
-
-extern inline int pte_none(pte_t pte)		{ return !pte_val(pte); }
-extern inline int pte_present(pte_t pte)	{ return pte_val(pte) & _PAGE_PRESENT; }
-extern inline void pte_clear(pte_t *ptep)	{ pte_val(*ptep) = 0; }
-
-extern inline int pgd_none(pgd_t pgd)		{ return !pgd_val(pgd); }
-extern inline int pgd_bad(pgd_t pgd)		{ return (pgd_val(pgd) & ~PAGE_MASK) != _PAGE_TABLE || pgd_val(pgd) > high_memory; }
-extern inline int pgd_present(pgd_t pgd)	{ return pgd_val(pgd) & _PAGE_PRESENT; }
-extern inline void pgd_clear(pgd_t * pgdp)	{ pgd_val(*pgdp) = 0; }
+#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)
 
+/* This handles the memory map */
+#if __mips == 3
 /*
- * The following only work if pte_present() is true.
- * Undefined behaviour if not..
+ * We handle pages at XKPHYS + 0x1800000000000000 (cachable, noncoherent)
+ * Pagetables are at  XKPHYS + 0x1000000000000000 (uncached)
  */
-extern inline int pte_read(pte_t pte)		{ return pte_val(pte) & _PAGE_USER; }
-extern inline int pte_write(pte_t pte)		{ return pte_val(pte) & _PAGE_RW; }
-extern inline int pte_exec(pte_t pte)		{ return pte_val(pte) & _PAGE_USER; }
-extern inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & _PAGE_DIRTY; }
-extern inline int pte_young(pte_t pte)		{ return pte_val(pte) & _PAGE_ACCESSED; }
-extern inline int pte_cow(pte_t pte)		{ return pte_val(pte) & _PAGE_COW; }
-
-extern inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) &= ~_PAGE_RW; return pte; }
-extern inline pte_t pte_rdprotect(pte_t pte)	{ pte_val(pte) &= ~_PAGE_USER; return pte; }
-extern inline pte_t pte_exprotect(pte_t pte)	{ pte_val(pte) &= ~_PAGE_USER; return pte; }
-extern inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
-extern inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
-extern inline pte_t pte_uncow(pte_t pte)	{ pte_val(pte) &= ~_PAGE_COW; return pte; }
-extern inline pte_t pte_mkwrite(pte_t pte)	{ pte_val(pte) |= _PAGE_RW; return pte; }
-extern inline pte_t pte_mkread(pte_t pte)	{ pte_val(pte) |= _PAGE_USER; return pte; }
-extern inline pte_t pte_mkexec(pte_t pte)	{ pte_val(pte) |= _PAGE_USER; return pte; }
-extern inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= _PAGE_DIRTY; return pte; }
-extern inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= _PAGE_ACCESSED; return pte; }
-extern inline pte_t pte_mkcow(pte_t pte)	{ pte_val(pte) |= _PAGE_COW; return pte; }
-
+#define PAGE_OFFSET	0x9800000000000000UL
+#define PT_OFFSET	0x9000000000000000UL
+#define MAP_MASK        0x07ffffffffffffffUL
+#else
 /*
- * Conversion functions: convert a page and protection to a page entry,
- * and a page entry and page directory to the page they refer to.
+ * We handle pages at KSEG0 (cachable, noncoherent)
+ * Pagetables are at  KSEG1 (uncached)
  */
-extern inline pte_t mk_pte(unsigned long page, pgprot_t pgprot)
-{ pte_t pte; pte_val(pte) = page | pgprot_val(pgprot); return pte; }
+#define PAGE_OFFSET	0x80000000
+#define PT_OFFSET	0xa0000000
+#define MAP_MASK        0x1fffffff
+#endif
+
+#define MAP_NR(addr)	((((unsigned long)(addr)) & MAP_MASK) >> PAGE_SHIFT)
 
-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; }
+#ifndef __LANGUAGE_ASSEMBLY__
 
-extern inline unsigned long pte_page(pte_t pte)	{ return pte_val(pte) & PAGE_MASK; }
-extern inline unsigned long pgd_page(pgd_t pgd)	{ return pgd_val(pgd) & PAGE_MASK; }
+extern unsigned long page_colour_mask;
 
-extern inline void pgd_set(pgd_t * pgdp, pte_t * ptep)
-{ pgd_val(*pgdp) = _PAGE_TABLE | (unsigned long) ptep; }
+extern inline unsigned long
+page_colour(unsigned long page)
+{
+	return page & page_colour_mask;
+}
 
-#endif /* !defined (__ASSEMBLY__) */
+#endif /* defined (__LANGUAGE_ASSEMBLY__) */
 #endif /* defined (__KERNEL__) */
 
 #endif /* __ASM_MIPS_PAGE_H */