From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- include/asm-um/pgtable-2level.h | 83 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 include/asm-um/pgtable-2level.h (limited to 'include/asm-um/pgtable-2level.h') diff --git a/include/asm-um/pgtable-2level.h b/include/asm-um/pgtable-2level.h new file mode 100644 index 00000000000..61eb2473424 --- /dev/null +++ b/include/asm-um/pgtable-2level.h @@ -0,0 +1,83 @@ +/* + * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) + * Copyright 2003 PathScale, Inc. + * Derived from include/asm-i386/pgtable.h + * Licensed under the GPL + */ + +#ifndef __UM_PGTABLE_2LEVEL_H +#define __UM_PGTABLE_2LEVEL_H + +#include + +/* PGDIR_SHIFT determines what a third-level page table entry can map */ + +#define PGDIR_SHIFT 22 +#define PGDIR_SIZE (1UL << PGDIR_SHIFT) +#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. + */ +#define PTRS_PER_PTE 1024 +#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE) +#define PTRS_PER_PGD 1024 +#define FIRST_USER_PGD_NR 0 + +#define pte_ERROR(e) \ + printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \ + pte_val(e)) +#define pgd_ERROR(e) \ + printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \ + pgd_val(e)) + +static inline int pgd_newpage(pgd_t pgd) { return 0; } +static inline void pgd_mkuptodate(pgd_t pgd) { } + +#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE)) + +static inline pte_t pte_mknewprot(pte_t pte) +{ + pte_val(pte) |= _PAGE_NEWPROT; + return(pte); +} + +static inline pte_t pte_mknewpage(pte_t pte) +{ + pte_val(pte) |= _PAGE_NEWPAGE; + return(pte); +} + +static inline void set_pte(pte_t *pteptr, pte_t pteval) +{ + /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so + * fix_range knows to unmap it. _PAGE_NEWPROT is specific to + * mapped pages. + */ + *pteptr = pte_mknewpage(pteval); + if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr); +} +#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) + +#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval)) + +#define pte_page(x) pfn_to_page(pte_pfn(x)) +#define pte_none(x) !(pte_val(x) & ~_PAGE_NEWPAGE) +#define pte_pfn(x) phys_to_pfn(pte_val(x)) +#define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot)) +#define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot)) + +#define pmd_page_kernel(pmd) \ + ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) + +/* + * Bits 0 through 3 are taken + */ +#define PTE_FILE_MAX_BITS 28 + +#define pte_to_pgoff(pte) (pte_val(pte) >> 4) + +#define pgoff_to_pte(off) ((pte_t) { ((off) << 4) + _PAGE_FILE }) + +#endif -- cgit v1.2.3-70-g09d2