patch-2.1.48 linux/include/asm-ppc/pgtable.h

Next file: linux/include/asm-ppc/poll.h
Previous file: linux/include/asm-ppc/page.h
Back to the patch index
Back to the overall index
Lines: 405
Date: Thu Jul 31 13:09:18 1997
Orig file: v2.1.47/linux/include/asm-ppc/pgtable.h
Orig date: Mon Jul 7 08:18:55 1997

diff -u --recursive --new-file v2.1.47/linux/include/asm-ppc/pgtable.h linux/include/asm-ppc/pgtable.h
@@ -1,22 +1,31 @@
-/* * Last edited: Nov  7 23:44 1995 (cort) */
 #ifndef _PPC_PGTABLE_H
 #define _PPC_PGTABLE_H
 
+#include <linux/config.h>
 #include <asm/page.h>
 #include <asm/mmu.h>
 
-inline void flush_tlb(void);
-inline void flush_tlb_all(void);
-inline void flush_tlb_mm(struct mm_struct *mm);
-inline void flush_tlb_page(struct vm_area_struct *vma, long vmaddr);
-inline void flush_tlb_range(struct mm_struct *mm, long start, long end);
-inline void flush_page_to_ram(unsigned long);
-inline void really_flush_cache_all(void);
+extern void flush_tlb_all(void);
+extern void flush_tlb_mm(struct mm_struct *mm);
+extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
+extern void flush_tlb_range(struct mm_struct *mm, unsigned long start,
+			    unsigned long end);
+extern void flush_tlb(void);
+
+/* Caches aren't brain-dead on the ppc. */
+#define flush_cache_all()			
+#define flush_cache_mm(mm)			
+#define flush_cache_range(mm, start, end)	
+#define flush_cache_page(vma, vmaddr)		
+/*
+ * For the page specified, write modified lines in the data cache
+ * out to memory, and invalidate lines in the instruction cache.
+ */
+extern void flush_page_to_ram(unsigned long);
 
-/* only called from asm in head.S, so why bother? */
-/*void MMU_init(void);*/
+extern unsigned long va_to_phys(unsigned long address);
 
-/* PMD_SHIFT determines the size of the area a second-level page table can map */
+/* PMD_SHIFT determines the size of the area mapped by the second-level page tables */
 #define PMD_SHIFT	22
 #define PMD_SIZE	(1UL << PMD_SHIFT)
 #define PMD_MASK	(~(PMD_SIZE-1))
@@ -27,8 +36,8 @@
 #define PGDIR_MASK	(~(PGDIR_SIZE-1))
 
 /*
- * entries per page directory level: the i386 is two-level, so
- * we don't really have any PMD directory physically.
+ * entries per page directory level: our page-table tree is two-level, so
+ * we don't really have any PMD directory.
  */
 #define PTRS_PER_PTE	1024
 #define PTRS_PER_PMD	1
@@ -41,41 +50,42 @@
  * The vmalloc() routines leaves a hole of 4kB between each vmalloced
  * area for the same reason. ;)
  */
-/* this must be a decent size since the ppc bat's can map only certain sizes
-   but these can be different from the physical ram size configured.
-   bat mapping must map at least physical ram size and vmalloc start addr
-   must beging AFTER the area mapped by the bat.
-   32 works for now, but may need to be changed with larger differences.
-   offset = next greatest bat mapping to ramsize - ramsize
-   (ie would be 0 if batmapping = ramsize)
-        -- Cort 10/6/96
-   */
-#define VMALLOC_OFFSET	(32*1024*1024)
+#define VMALLOC_OFFSET	(0x2000000) /* 32M */
 #define VMALLOC_START ((((long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
 #define VMALLOC_VMADDR(x) ((unsigned long)(x))
 
-#define _PAGE_PRESENT	0x001
-#define _PAGE_RW	0x002
-#define _PAGE_USER	0x004
-#define _PAGE_PCD	0x010
-#define _PAGE_ACCESSED	0x020
-#define _PAGE_DIRTY	0x040
-#define _PAGE_COW	0x200	/* implemented in software (one of the AVL bits) */
-#define _PAGE_NO_CACHE	0x400
+/*
+ * Bits in a linux-style PTE.  These match the bits in the
+ * (hardware-defined) PowerPC PTE as closely as possible.
+ */
+#define _PAGE_PRESENT	0x001	/* software: pte contains a translation */
+#define _PAGE_USER	0x002	/* matches one of the PP bits */
+#define _PAGE_RW	0x004	/* software: user write access allowed */
+#define _PAGE_GUARDED	0x008
+#define _PAGE_COHERENT	0x010	/* M: enforce memory coherence (SMP systems) */
+#define _PAGE_NO_CACHE	0x020	/* I: cache inhibit */
+#define _PAGE_WRITETHRU	0x040	/* W: cache write-through */
+#define _PAGE_DIRTY	0x080	/* C: page changed */
+#define _PAGE_ACCESSED	0x100	/* R: page referenced */
+#define _PAGE_HWWRITE	0x200	/* software: _PAGE_RW & _PAGE_DIRTY */
 
-#define _PAGE_TABLE	(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
 #define _PAGE_CHG_MASK	(PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
 
 #define PAGE_NONE	__pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
-#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
-#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_COW)
+#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
+				 _PAGE_ACCESSED)
+#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
 #define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
-#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
-#define PAGE_KERNEL_NO_CACHE	__pgprot(_PAGE_NO_CACHE | _PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
+#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | \
+				 _PAGE_HWWRITE | _PAGE_ACCESSED)
+#define PAGE_KERNEL_CI	__pgprot(_PAGE_PRESENT | _PAGE_NO_CACHE | _PAGE_RW | \
+				 _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_ACCESSED)
 
 /*
- * The i386 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..
+ * The PowerPC can only do execute protection on a segment (256MB) basis,
+ * not on a page basis.  So we consider execute permission the same as read.
+ * Also, write permissions imply read permissions.
+ * This is the closest we can get..
  */
 #define __P000	PAGE_NONE
 #define __P001	PAGE_READONLY
@@ -96,18 +106,6 @@
 #define __S111	PAGE_SHARED
 
 /*
- * Define this if things work differently on a i386 and a i486:
- * it will (on a i486) warn about kernel memory accesses that are
- * done without a 'verify_area(VERIFY_WRITE,..)'
- */
-#undef CONFIG_TEST_VERIFY_AREA
-
-#if 0
-/* page table for 0-4MB for everybody */
-extern unsigned long pg0[1024];
-#endif
-
-/*
  * BAD_PAGETABLE is used when we need a bogus page-table, while
  * BAD_PAGE is used for a bogus page.
  *
@@ -119,49 +117,36 @@
 
 extern unsigned long empty_zero_page[1024];
 
-#define BAD_PAGETABLE __bad_pagetable()
-#define BAD_PAGE __bad_page()
-#define ZERO_PAGE ((unsigned long) empty_zero_page)
+#define BAD_PAGETABLE	__bad_pagetable()
+#define BAD_PAGE	__bad_page()
+#define ZERO_PAGE	((unsigned long) empty_zero_page)
 
 /* number of bits that fit into a memory pointer */
-#define BITS_PER_PTR			(8*sizeof(unsigned long))
+#define BITS_PER_PTR	(8*sizeof(unsigned long))
 
 /* to align the pointer to a pointer address */
-#define PTR_MASK			(~(sizeof(void*)-1))
+#define PTR_MASK	(~(sizeof(void*)-1))
 
-/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
+/* sizeof(void*) == 1<<SIZEOF_PTR_LOG2 */
 /* 64-bit machines, beware!  SRB. */
-#define SIZEOF_PTR_LOG2			2
-
-/* to find an entry in a page-table */
-#define PAGE_PTR(address) \
-((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)
+#define SIZEOF_PTR_LOG2	2
 
 /* to set the page-dir */
 /* tsk is a task_struct and pgdir is a pte_t */
-#define SET_PAGE_DIR(tsk,pgdir) \
-do { \
-	(tsk)->tss.pg_tables = (unsigned long *)(pgdir); \
-	if ((tsk) == current) \
-	{ \
-/*_printk("Change page tables = %x\n", pgdir);*/ \
-	} \
-} while (0)
-
-/* comes from include/linux/mm.h now -- Cort */
-/*extern void *high_memory;*/
+#define SET_PAGE_DIR(tsk,pgdir) ({ \
+	((tsk)->tss.pg_tables = (unsigned long *)(pgdir)); \
+})
 
 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 pmd_none(pmd_t pmd)		{ return !pmd_val(pmd); }
-extern inline int pmd_bad(pmd_t pmd)		{ return (pmd_val(pmd) & ~PAGE_MASK) != _PAGE_TABLE; }
-extern inline int pmd_present(pmd_t pmd)	{ return pmd_val(pmd) & _PAGE_PRESENT; }
-extern inline int pmd_inuse(pmd_t *pmdp)	{ return 0; }
+extern inline int pmd_bad(pmd_t pmd)		{ return (pmd_val(pmd) & ~PAGE_MASK) != 0; }
+extern inline int pmd_present(pmd_t pmd)	{ return (pmd_val(pmd) & PAGE_MASK) != 0; }
 extern inline void pmd_clear(pmd_t * pmdp)	{ pmd_val(*pmdp) = 0; }
-extern inline void pmd_reuse(pmd_t * pmdp)	{ }
 
+     
 /*
  * 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
@@ -172,7 +157,6 @@
 extern inline int pgd_present(pgd_t pgd)	{ return 1; }
 extern inline void pgd_clear(pgd_t * pgdp)	{ }
 
-
 /*
  * The following only work if pte_present() is true.
  * Undefined behaviour if not..
@@ -182,48 +166,82 @@
 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; }
+extern inline int pte_uncache(pte_t pte)        { return pte_val(pte) |= _PAGE_NO_CACHE; }
+extern inline int pte_cache(pte_t pte)          { return pte_val(pte) &= ~_PAGE_NO_CACHE; }
 
-/*
- * 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 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_wrprotect(pte_t pte) {
+	pte_val(pte) &= ~(_PAGE_RW | _PAGE_HWWRITE); return pte; }
+extern inline pte_t pte_mkclean(pte_t pte) {
+	pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_HWWRITE); return pte; }
+extern inline pte_t pte_mkold(pte_t pte) {
+	pte_val(pte) &= ~_PAGE_ACCESSED; 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_mkwrite(pte_t pte)
+{
+	pte_val(pte) |= _PAGE_RW;
+	if (pte_val(pte) & _PAGE_DIRTY)
+		pte_val(pte) |= _PAGE_HWWRITE;
+	return pte;
+}
+extern inline pte_t pte_mkdirty(pte_t pte)
+{
+	pte_val(pte) |= _PAGE_DIRTY;
+	if (pte_val(pte) & _PAGE_RW)
+		pte_val(pte) |= _PAGE_HWWRITE;
+	return pte;
+}
+extern inline pte_t pte_mkyoung(pte_t pte) {
+	pte_val(pte) |= _PAGE_ACCESSED; 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))
+#if 1
+#define set_pte(pteptr, pteval)	((*(pteptr)) = (pteval))
+#else
+extern inline void set_pte(pte_t *pteptr, pte_t pteval)
+{
+	unsigned long val = pte_val(pteval);
+	extern void xmon(void *);
+
+	if ((val & _PAGE_PRESENT) && ((val < 0x111000 || (val & 0x800)
+	    || ((val & _PAGE_HWWRITE) && (~val & (_PAGE_RW|_PAGE_DIRTY)))) {
+		printk("bad pte val %lx ptr=%p\n", val, pteptr);
+		xmon(0);
+	}
+	*pteptr = pteval;
+}
+#endif
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
 
-static pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot)
+static inline pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot)
 { pte_t pte; pte_val(pte) = (page) | pgprot_val(pgprot); return pte; }
-/*#define mk_pte_phys(physpage, pgprot) \
-({ pte_t __pte; pte_val(__pte) = physpage + pgprot_val(pgprot); __pte; })*/
 
 extern inline pte_t mk_pte(unsigned long page, pgprot_t pgprot)
-{ pte_t pte; pte_val(pte) = page | pgprot_val(pgprot); return pte; }
+{ pte_t pte; pte_val(pte) = __pa(page) | 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; }
 
 extern inline unsigned long pte_page(pte_t pte)
-{ return pte_val(pte) & PAGE_MASK; }
+{ return (pte_val(pte) & PAGE_MASK) + KERNELBASE; }
 
 extern inline unsigned long pmd_page(pmd_t pmd)
-{ return pmd_val(pmd) & PAGE_MASK; }
+{ return pmd_val(pmd); }
 
 
 /* to find an entry in a kernel page-table-directory */
@@ -250,13 +268,14 @@
 
 /*
  * Allocate and free page tables. The xxx_kernel() versions are
- * used to allocate a kernel page table - this turns on ASN bits
- * if any, and marks the page tables reserved.
+ * used to allocate a kernel page table, but are actually identical
+ * to the xxx() versions.
  */
 extern inline void pte_free_kernel(pte_t * pte)
 {
 	free_page((unsigned long) pte);
 }
+
 extern inline pte_t * pte_alloc_kernel(pmd_t * pmd, unsigned long address)
 {
 	address = (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
@@ -264,20 +283,17 @@
 		pte_t * page = (pte_t *) get_free_page(GFP_KERNEL);
 		if (pmd_none(*pmd)) {
 			if (page) {
-/*                                pmd_set(pmd,page);*/
-			pmd_val(*pmd) = _PAGE_TABLE | (unsigned long) page;
+				pmd_val(*pmd) = (unsigned long) page;
 				return page + address;
 			}
-/*			pmd_set(pmd, BAD_PAGETABLE);*/
-			pmd_val(*pmd) = _PAGE_TABLE | (unsigned long) BAD_PAGETABLE;
+			pmd_val(*pmd) = (unsigned long) BAD_PAGETABLE;
 			return NULL;
 		}
 		free_page((unsigned long) page);
 	}
 	if (pmd_bad(*pmd)) {
 		printk("Bad pmd in pte_alloc: %08lx\n", pmd_val(*pmd));
-/*		pmd_set(pmd, (pte_t *) BAD_PAGETABLE);		*/
-		pmd_val(*pmd) = _PAGE_TABLE | (unsigned long) BAD_PAGETABLE;
+		pmd_val(*pmd) = (unsigned long) BAD_PAGETABLE;
 		return NULL;
 	}
 	return (pte_t *) pmd_page(*pmd) + address;
@@ -308,17 +324,17 @@
 		pte_t * page = (pte_t *) get_free_page(GFP_KERNEL);
 		if (pmd_none(*pmd)) {
 			if (page) {
-				pmd_val(*pmd) = _PAGE_TABLE | (unsigned long) page;
+				pmd_val(*pmd) = (unsigned long) page;
 				return page + address;
 			}
-			pmd_val(*pmd) = _PAGE_TABLE | (unsigned long) BAD_PAGETABLE;
+			pmd_val(*pmd) = (unsigned long) BAD_PAGETABLE;
 			return NULL;
 		}
 		free_page((unsigned long) page);
 	}
 	if (pmd_bad(*pmd)) {
 		printk("Bad pmd in pte_alloc: %08lx\n", pmd_val(*pmd));
-		pmd_val(*pmd) = _PAGE_TABLE | (unsigned long) BAD_PAGETABLE;
+		pmd_val(*pmd) = (unsigned long) BAD_PAGETABLE;
 		return NULL;
 	}
 	return (pte_t *) pmd_page(*pmd) + address;
@@ -350,18 +366,17 @@
 extern pgd_t swapper_pg_dir[1024];
 
 /*
- * Software maintained MMU tables may have changed -- update the
- * hardware [aka cache]
+ * Page tables may have changed.  We don't need to do anything here
+ * as entries are faulted into the hash table by the low-level
+ * data/instruction access exception handlers.
  */
-extern inline void update_mmu_cache(struct vm_area_struct * vma,
-	unsigned long address, pte_t _pte);
+#define update_mmu_cache(vma,address,pte) while(0){}
 
 
 #define SWP_TYPE(entry) (((entry) >> 1) & 0x7f)
 #define SWP_OFFSET(entry) ((entry) >> 8)
 #define SWP_ENTRY(type,offset) (((type) << 1) | ((offset) << 8))
 
-#define module_map      vmalloc
-#define module_unmap    vfree
+
 
 #endif /* _PPC_PAGE_H */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov