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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-i386/pgtable-3level.h
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!
Diffstat (limited to 'include/asm-i386/pgtable-3level.h')
-rw-r--r--include/asm-i386/pgtable-3level.h160
1 files changed, 160 insertions, 0 deletions
diff --git a/include/asm-i386/pgtable-3level.h b/include/asm-i386/pgtable-3level.h
new file mode 100644
index 00000000000..d609f9c2c1f
--- /dev/null
+++ b/include/asm-i386/pgtable-3level.h
@@ -0,0 +1,160 @@
+#ifndef _I386_PGTABLE_3LEVEL_H
+#define _I386_PGTABLE_3LEVEL_H
+
+#include <asm-generic/pgtable-nopud.h>
+
+/*
+ * Intel Physical Address Extension (PAE) Mode - three-level page
+ * tables on PPro+ CPUs.
+ *
+ * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
+ */
+
+#define pte_ERROR(e) \
+ printk("%s:%d: bad pte %p(%08lx%08lx).\n", __FILE__, __LINE__, &(e), (e).pte_high, (e).pte_low)
+#define pmd_ERROR(e) \
+ printk("%s:%d: bad pmd %p(%016Lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
+#define pgd_ERROR(e) \
+ printk("%s:%d: bad pgd %p(%016Lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
+
+#define pud_none(pud) 0
+#define pud_bad(pud) 0
+#define pud_present(pud) 1
+
+/*
+ * Is the pte executable?
+ */
+static inline int pte_x(pte_t pte)
+{
+ return !(pte_val(pte) & _PAGE_NX);
+}
+
+/*
+ * All present user-pages with !NX bit are user-executable:
+ */
+static inline int pte_exec(pte_t pte)
+{
+ return pte_user(pte) && pte_x(pte);
+}
+/*
+ * All present pages with !NX bit are kernel-executable:
+ */
+static inline int pte_exec_kernel(pte_t pte)
+{
+ return pte_x(pte);
+}
+
+/* Rules for using set_pte: the pte being assigned *must* be
+ * either not present or in a state where the hardware will
+ * not attempt to update the pte. In places where this is
+ * not possible, use pte_get_and_clear to obtain the old pte
+ * value and then use set_pte to update it. -ben
+ */
+static inline void set_pte(pte_t *ptep, pte_t pte)
+{
+ ptep->pte_high = pte.pte_high;
+ smp_wmb();
+ ptep->pte_low = pte.pte_low;
+}
+#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+#define __HAVE_ARCH_SET_PTE_ATOMIC
+#define set_pte_atomic(pteptr,pteval) \
+ set_64bit((unsigned long long *)(pteptr),pte_val(pteval))
+#define set_pmd(pmdptr,pmdval) \
+ set_64bit((unsigned long long *)(pmdptr),pmd_val(pmdval))
+#define set_pud(pudptr,pudval) \
+ set_64bit((unsigned long long *)(pudptr),pud_val(pudval))
+
+/*
+ * Pentium-II erratum A13: in PAE mode we explicitly have to flush
+ * the TLB via cr3 if the top-level pgd is changed...
+ * We do not let the generic code free and clear pgd entries due to
+ * this erratum.
+ */
+static inline void pud_clear (pud_t * pud) { }
+
+#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
+
+#define pmd_page_kernel(pmd) \
+((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
+
+#define pud_page(pud) \
+((struct page *) __va(pud_val(pud) & PAGE_MASK))
+
+#define pud_page_kernel(pud) \
+((unsigned long) __va(pud_val(pud) & PAGE_MASK))
+
+
+/* Find an entry in the second-level page table.. */
+#define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
+ pmd_index(address))
+
+static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+ pte_t res;
+
+ /* xchg acts as a barrier before the setting of the high bits */
+ res.pte_low = xchg(&ptep->pte_low, 0);
+ res.pte_high = ptep->pte_high;
+ ptep->pte_high = 0;
+
+ return res;
+}
+
+static inline int pte_same(pte_t a, pte_t b)
+{
+ return a.pte_low == b.pte_low && a.pte_high == b.pte_high;
+}
+
+#define pte_page(x) pfn_to_page(pte_pfn(x))
+
+static inline int pte_none(pte_t pte)
+{
+ return !pte.pte_low && !pte.pte_high;
+}
+
+static inline unsigned long pte_pfn(pte_t pte)
+{
+ return (pte.pte_low >> PAGE_SHIFT) |
+ (pte.pte_high << (32 - PAGE_SHIFT));
+}
+
+extern unsigned long long __supported_pte_mask;
+
+static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
+{
+ pte_t pte;
+
+ pte.pte_high = (page_nr >> (32 - PAGE_SHIFT)) | \
+ (pgprot_val(pgprot) >> 32);
+ pte.pte_high &= (__supported_pte_mask >> 32);
+ pte.pte_low = ((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)) & \
+ __supported_pte_mask;
+ return pte;
+}
+
+static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
+{
+ return __pmd((((unsigned long long)page_nr << PAGE_SHIFT) | \
+ pgprot_val(pgprot)) & __supported_pte_mask);
+}
+
+/*
+ * Bits 0, 6 and 7 are taken in the low part of the pte,
+ * put the 32 bits of offset into the high part.
+ */
+#define pte_to_pgoff(pte) ((pte).pte_high)
+#define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
+#define PTE_FILE_MAX_BITS 32
+
+/* Encode and de-code a swap entry */
+#define __swp_type(x) (((x).val) & 0x1f)
+#define __swp_offset(x) ((x).val >> 5)
+#define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) << 5})
+#define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high })
+#define __swp_entry_to_pte(x) ((pte_t){ 0, (x).val })
+
+#define __pmd_free_tlb(tlb, x) do { } while (0)
+
+#endif /* _I386_PGTABLE_3LEVEL_H */