#include "asm/page.h"
#include "asm/fixmap.h"
-extern pgd_t swapper_pg_dir[1024];
-
extern void *um_virt_to_phys(struct task_struct *task, unsigned long virt,
pte_t *pte_out);
#define pgd_ERROR(e) \
printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+
/*
* pgd entries used up by user/kernel:
*/
* area for the same reason. ;)
*/
-extern unsigned long high_physmem;
+extern unsigned long end_iomem;
#define VMALLOC_OFFSET (__va_space)
-#define VMALLOC_START (((unsigned long) high_physmem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
+#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
#ifdef CONFIG_HIGHMEM
# define VMALLOC_END (PKMAP_BASE-2*PAGE_SIZE)
#define _PAGE_PRESENT 0x001
#define _PAGE_NEWPAGE 0x002
-#define _PAGE_PROTNONE 0x004 /* If not present */
-#define _PAGE_RW 0x008
-#define _PAGE_USER 0x010
-#define _PAGE_ACCESSED 0x020
-#define _PAGE_DIRTY 0x040
-#define _PAGE_NEWPROT 0x080
+#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
#define REGION_MASK 0xf0000000
#define REGION_SHIFT 28
#define BAD_PAGETABLE __bad_pagetable()
#define BAD_PAGE __bad_page()
-#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_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))
#define pte_clear(xp) do { pte_val(*(xp)) = _PAGE_NEWPAGE; } while (0)
-#define phys_region_index(x) (((x) & REGION_MASK) >> REGION_SHIFT)
-#define pte_region_index(x) phys_region_index(pte_val(x))
-
#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 pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
-extern struct page *pte_mem_map(pte_t pte);
-extern struct page *phys_mem_map(unsigned long phys);
-extern unsigned long phys_to_pfn(unsigned long p);
-extern unsigned long pfn_to_phys(unsigned long pfn);
+#define pte_page(pte) phys_to_page(pte_val(pte))
+#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
-#define pte_page(x) pfn_to_page(pte_pfn(x))
-#define pte_address(x) (__va(pte_val(x) & PAGE_MASK))
-#define mk_phys(a, r) ((a) + (r << REGION_SHIFT))
-#define phys_addr(p) ((p) & ~REGION_MASK)
-#define phys_page(p) (phys_mem_map(p) + ((phys_addr(p)) >> PAGE_SHIFT))
#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))
+
+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)
+
+/*
+ * Bits 0 through 3 are taken
+ */
+#define PTE_FILE_MAX_BITS 28
+
+#define pte_to_pgoff(pte) ((pte).pte_low >> 4)
+
+#define pgoff_to_pte(off) \
+ ((pte_t) { ((off) << 4) + _PAGE_FILE })
static inline pte_t pte_mknewprot(pte_t pte)
{
* The following only work if pte_present() is true.
* Undefined behaviour if not..
*/
+static inline int pte_user(pte_t pte)
+{
+ return((pte_val(pte) & _PAGE_USER) &&
+ !(pte_val(pte) & _PAGE_PROTNONE));
+}
+
static inline int pte_read(pte_t pte)
{
return((pte_val(pte) & _PAGE_USER) &&
!(pte_val(pte) & _PAGE_PROTNONE));
}
+/*
+ * The following only works if pte_present() is not true.
+ */
+static inline int pte_file(pte_t pte)
+{
+ return (pte).pte_low & _PAGE_FILE;
+}
+
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
static inline int pte_newpage(pte_t pte) { return pte_val(pte) & _PAGE_NEWPAGE; }
* and a page entry and page directory to the page they refer to.
*/
-#define mk_pte(page, pgprot) \
-({ \
- pte_t __pte; \
- \
- pte_val(__pte) = page_to_phys(page) + pgprot_val(pgprot);\
- if(pte_present(__pte)) pte_mknewprot(pte_mknewpage(__pte)); \
- __pte; \
-})
+extern pte_t mk_pte(struct page *page, pgprot_t pgprot);
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
}
#define pmd_page_kernel(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
-#define pmd_page(pmd) (phys_mem_map(pmd_val(pmd) & PAGE_MASK) + \
- ((phys_addr(pmd_val(pmd)) >> PAGE_SHIFT)))
-/* to find an entry in a page-table-directory. */
+/*
+ * 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))
-/* to find an entry in a page-table-directory */
+/*
+ * 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 + ((address) >> PGDIR_SHIFT))
-/* to find an entry in a kernel page-table-directory */
+
+/*
+ * 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)
#define pmd_index(address) \
return (pmd_t *) dir;
}
-/* Find an entry in the third-level page table.. */
+/*
+ * 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 update_mmu_cache(vma,address,pte) do ; while (0)
/* Encode and de-code a swap entry */
-#define __swp_type(x) (((x).val >> 3) & 0x7f)
-#define __swp_offset(x) ((x).val >> 10)
+#define __swp_type(x) (((x).val >> 4) & 0x3f)
+#define __swp_offset(x) ((x).val >> 11)
#define __swp_entry(type, offset) \
- ((swp_entry_t) { ((type) << 3) | ((offset) << 10) })
+ ((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 })
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