1 files changed, 386 insertions, 0 deletions

diff --git a/include/asm-um/pgtable.h b/include/asm-um/pgtable.h
new file mode 100644
index 000000000000..71f9c0c78c0c
--- /dev/null
+++ b/include/asm-um/pgtable.h
@@ -0,0 +1,386 @@
+/* 
+ * 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_H
+#define __UM_PGTABLE_H
+
+#include "linux/sched.h"
+#include "linux/linkage.h"
+#include "asm/processor.h"
+#include "asm/page.h"
+#include "asm/fixmap.h"
+
+#define _PAGE_PRESENT   0x001
+#define _PAGE_NEWPAGE   0x002
+#define _PAGE_NEWPROT   0x004
+#define _PAGE_FILE      0x008   /* set:pagecache unset:swap */
+#define _PAGE_PROTNONE  0x010   /* If not present */
+#define _PAGE_RW        0x020
+#define _PAGE_USER      0x040
+#define _PAGE_ACCESSED  0x080
+#define _PAGE_DIRTY     0x100
+
+#ifdef CONFIG_3_LEVEL_PGTABLES
+#include "asm/pgtable-3level.h"
+#else
+#include "asm/pgtable-2level.h"
+#endif
+
+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+
+extern void *um_virt_to_phys(struct task_struct *task, unsigned long virt,
+                             pte_t *pte_out);
+
+/* zero page used for uninitialized stuff */
+extern unsigned long *empty_zero_page;
+
+#define pgtable_cache_init() do ; while (0)
+
+/*
+ * pgd entries used up by user/kernel:
+ */
+
+#define USER_PGD_PTRS (TASK_SIZE >> PGDIR_SHIFT)
+#define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS)
+
+#ifndef __ASSEMBLY__
+/* Just any arbitrary offset to the start of the vmalloc VM area: the
+ * current 8MB value just means that there will be a 8MB "hole" after the
+ * physical memory until the kernel virtual memory starts.  That means that
+ * any out-of-bounds memory accesses will hopefully be caught.
+ * The vmalloc() routines leaves a hole of 4kB between each vmalloced
+ * area for the same reason. ;)
+ */
+
+extern unsigned long end_iomem;
+
+#define VMALLOC_OFFSET  (__va_space)
+#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
+
+#ifdef CONFIG_HIGHMEM
+# define VMALLOC_END    (PKMAP_BASE-2*PAGE_SIZE)
+#else
+# define VMALLOC_END    (FIXADDR_START-2*PAGE_SIZE)
+#endif
+
+#define REGION_SHIFT    (sizeof(pte_t) * 8 - 4)
+#define REGION_MASK     (((unsigned long) 0xf) << REGION_SHIFT)
+
+#define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
+#define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
+#define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
+
+#define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
+#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_RO  __pgprot(_PAGE_PRESENT | _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..
+ */
+#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
+
+/*
+ * Define this if things work differently on an i386 and an i486:
+ * it will (on an i486) warn about kernel memory accesses that are
+ * done without a 'verify_area(VERIFY_WRITE,..)'
+ */
+#undef TEST_VERIFY_AREA
+
+/* 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..
+ */
+extern pte_t __bad_page(void);
+extern pte_t * __bad_pagetable(void);
+
+#define BAD_PAGETABLE __bad_pagetable()
+#define BAD_PAGE __bad_page()
+
+#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
+
+/* number of bits that fit into a memory pointer */
+#define BITS_PER_PTR                    (8*sizeof(unsigned long))
+
+/* 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                 3
+
+/* 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 pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE))
+
+#define pmd_none(x)     (!(pmd_val(x) & ~_PAGE_NEWPAGE))
+#define pmd_bad(x)      ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
+#define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
+#define pmd_clear(xp)   do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0)
+
+#define pmd_newpage(x)  (pmd_val(x) & _PAGE_NEWPAGE)
+#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE)
+
+#define pud_newpage(x)  (pud_val(x) & _PAGE_NEWPAGE)
+#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE)
+
+#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
+
+#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
+
+#define pte_address(x) (__va(pte_val(x) & PAGE_MASK))
+#define mk_phys(a, r) ((a) + (((unsigned long) r) << REGION_SHIFT))
+#define phys_addr(p) ((p) & ~REGION_MASK)
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+static inline int pte_user(pte_t pte)
+{
+        return((pte_get_bits(pte, _PAGE_USER)) &&
+               !(pte_get_bits(pte, _PAGE_PROTNONE)));
+}
+
+static inline int pte_read(pte_t pte)
+{ 
+        return((pte_get_bits(pte, _PAGE_USER)) &&
+               !(pte_get_bits(pte, _PAGE_PROTNONE)));
+}
+
+static inline int pte_exec(pte_t pte){
+        return((pte_get_bits(pte, _PAGE_USER)) &&
+               !(pte_get_bits(pte, _PAGE_PROTNONE)));
+}
+
+static inline int pte_write(pte_t pte)
+{
+        return((pte_get_bits(pte, _PAGE_RW)) &&
+               !(pte_get_bits(pte, _PAGE_PROTNONE)));
+}
+
+/*
+ * The following only works if pte_present() is not true.
+ */
+static inline int pte_file(pte_t pte)
+{
+        return pte_get_bits(pte, _PAGE_FILE);
+}
+
+static inline int pte_dirty(pte_t pte)
+{
+        return pte_get_bits(pte, _PAGE_DIRTY);
+}
+
+static inline int pte_young(pte_t pte)
+{
+        return pte_get_bits(pte, _PAGE_ACCESSED);
+}
+
+static inline int pte_newpage(pte_t pte)
+{
+        return pte_get_bits(pte, _PAGE_NEWPAGE);
+}
+
+static inline int pte_newprot(pte_t pte)
+{ 
+        return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));
+}
+
+static inline pte_t pte_rdprotect(pte_t pte)
+{ 
+        pte_clear_bits(pte, _PAGE_USER);
+        return(pte_mknewprot(pte));
+}
+
+static inline pte_t pte_exprotect(pte_t pte)
+{ 
+        pte_clear_bits(pte, _PAGE_USER);
+        return(pte_mknewprot(pte));
+}
+
+static inline pte_t pte_mkclean(pte_t pte)
+{
+        pte_clear_bits(pte, _PAGE_DIRTY);
+        return(pte);
+}
+
+static inline pte_t pte_mkold(pte_t pte)        
+{ 
+        pte_clear_bits(pte, _PAGE_ACCESSED);
+        return(pte);
+}
+
+static inline pte_t pte_wrprotect(pte_t pte)
+{ 
+        pte_clear_bits(pte, _PAGE_RW);
+        return(pte_mknewprot(pte)); 
+}
+
+static inline pte_t pte_mkread(pte_t pte)
+{ 
+        pte_set_bits(pte, _PAGE_RW);
+        return(pte_mknewprot(pte)); 
+}
+
+static inline pte_t pte_mkexec(pte_t pte)
+{ 
+        pte_set_bits(pte, _PAGE_USER);
+        return(pte_mknewprot(pte)); 
+}
+
+static inline pte_t pte_mkdirty(pte_t pte)
+{ 
+        pte_set_bits(pte, _PAGE_DIRTY);
+        return(pte);
+}
+
+static inline pte_t pte_mkyoung(pte_t pte)
+{
+        pte_set_bits(pte, _PAGE_ACCESSED);
+        return(pte);
+}
+
+static inline pte_t pte_mkwrite(pte_t pte)      
+{
+        pte_set_bits(pte, _PAGE_RW);
+        return(pte_mknewprot(pte)); 
+}
+
+static inline pte_t pte_mkuptodate(pte_t pte)   
+{
+        pte_clear_bits(pte, _PAGE_NEWPAGE);
+        if(pte_present(pte))
+                pte_clear_bits(pte, _PAGE_NEWPROT);
+        return(pte); 
+}
+
+extern phys_t page_to_phys(struct page *page);
+
+/*
+ * 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 pte_t mk_pte(struct page *page, pgprot_t pgprot);
+
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{
+        pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot);
+        if(pte_present(pte)) pte = pte_mknewpage(pte_mknewprot(pte));
+        return pte; 
+}
+
+#define pmd_page_kernel(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
+
+/*
+ * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
+ *
+ * this macro returns the index of the entry in the pgd page which would
+ * control the given virtual address
+ */
+#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
+
+#define pgd_index_k(addr) pgd_index(addr)
+
+/*
+ * pgd_offset() returns a (pgd_t *)
+ * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
+ */
+#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
+
+/*
+ * a shortcut which implies the use of the kernel's pgd, instead
+ * of a process's
+ */
+#define pgd_offset_k(address) pgd_offset(&init_mm, address)
+
+/*
+ * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
+ *
+ * this macro returns the index of the entry in the pmd page which would
+ * control the given virtual address
+ */
+#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
+
+/*
+ * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
+ *
+ * this macro returns the index of the entry in the pte page which would
+ * control the given virtual address
+ */
+#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
+#define pte_offset_kernel(dir, address) \
+        ((pte_t *) pmd_page_kernel(*(dir)) +  pte_index(address))
+#define pte_offset_map(dir, address) \
+        ((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
+#define pte_offset_map_nested(dir, address) pte_offset_map(dir, address)
+#define pte_unmap(pte) do { } while (0)
+#define pte_unmap_nested(pte) do { } while (0)
+
+#define update_mmu_cache(vma,address,pte) do ; while (0)
+
+/* Encode and de-code a swap entry */
+#define __swp_type(x)                   (((x).val >> 4) & 0x3f)
+#define __swp_offset(x)                 ((x).val >> 11)
+
+#define __swp_entry(type, offset) \
+        ((swp_entry_t) { ((type) << 4) | ((offset) << 11) })
+#define __pte_to_swp_entry(pte) \
+        ((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
+#define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
+
+#define kern_addr_valid(addr) (1)
+
+#include <asm-generic/pgtable.h>
+
+#include <asm-generic/pgtable-nopud.h>
+
+#endif
+#endif
+
+extern struct page *phys_to_page(const unsigned long phys);
+extern struct page *__virt_to_page(const unsigned long virt);
+#define virt_to_page(addr) __virt_to_page((const unsigned long) addr)
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */