1 files changed, 383 insertions, 0 deletions

diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
new file mode 100644
index 000000000000..6a0edf72ffbc
--- /dev/null
+++ b/arch/mips/include/asm/pgtable.h
@@ -0,0 +1,383 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2003 Ralf Baechle
+ */
+#ifndef _ASM_PGTABLE_H
+#define _ASM_PGTABLE_H
+
+#ifdef CONFIG_32BIT
+#include <asm/pgtable-32.h>
+#endif
+#ifdef CONFIG_64BIT
+#include <asm/pgtable-64.h>
+#endif
+
+#include <asm/io.h>
+#include <asm/pgtable-bits.h>
+
+struct mm_struct;
+struct vm_area_struct;
+
+#define PAGE_NONE       __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
+#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
+                                 _page_cachable_default)
+#define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | \
+                                 _page_cachable_default)
+#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | \
+                                 _page_cachable_default)
+#define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
+                                 _PAGE_GLOBAL | _page_cachable_default)
+#define PAGE_USERIO     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
+                                 _page_cachable_default)
+#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
+                        __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
+
+/*
+ * MIPS can't do page protection for execute, and considers that the same like
+ * read. Also, write permissions imply read permissions. This is the closest
+ * we can get by reasonable means..
+ */
+
+/*
+ * Dummy values to fill the table in mmap.c
+ * The real values will be generated at runtime
+ */
+#define __P000 __pgprot(0)
+#define __P001 __pgprot(0)
+#define __P010 __pgprot(0)
+#define __P011 __pgprot(0)
+#define __P100 __pgprot(0)
+#define __P101 __pgprot(0)
+#define __P110 __pgprot(0)
+#define __P111 __pgprot(0)
+
+#define __S000 __pgprot(0)
+#define __S001 __pgprot(0)
+#define __S010 __pgprot(0)
+#define __S011 __pgprot(0)
+#define __S100 __pgprot(0)
+#define __S101 __pgprot(0)
+#define __S110 __pgprot(0)
+#define __S111 __pgprot(0)
+
+extern unsigned long _page_cachable_default;
+
+/*
+ * ZERO_PAGE is a global shared page that is always zero; used
+ * for zero-mapped memory areas etc..
+ */
+
+extern unsigned long empty_zero_page;
+extern unsigned long zero_page_mask;
+
+#define ZERO_PAGE(vaddr) \
+        (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
+
+extern void paging_init(void);
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
+#define pmd_phys(pmd)           virt_to_phys((void *)pmd_val(pmd))
+#define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
+#define pmd_page_vaddr(pmd)     pmd_val(pmd)
+
+#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
+
+#define pte_none(pte)           (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
+#define pte_present(pte)        ((pte).pte_low & _PAGE_PRESENT)
+
+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;
+        //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
+
+        if (pte.pte_low & _PAGE_GLOBAL) {
+                pte_t *buddy = ptep_buddy(ptep);
+                /*
+                 * Make sure the buddy is global too (if it's !none,
+                 * it better already be global)
+                 */
+                if (pte_none(*buddy)) {
+                        buddy->pte_low  |= _PAGE_GLOBAL;
+                        buddy->pte_high |= _PAGE_GLOBAL;
+                }
+        }
+}
+#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
+
+static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+        pte_t null = __pte(0);
+
+        /* Preserve global status for the pair */
+        if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
+                null.pte_low = null.pte_high = _PAGE_GLOBAL;
+
+        set_pte_at(mm, addr, ptep, null);
+}
+#else
+
+#define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
+#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
+
+/*
+ * Certain architectures need to do special things when pte's
+ * within a page table are directly modified.  Thus, the following
+ * hook is made available.
+ */
+static inline void set_pte(pte_t *ptep, pte_t pteval)
+{
+        *ptep = pteval;
+#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
+        if (pte_val(pteval) & _PAGE_GLOBAL) {
+                pte_t *buddy = ptep_buddy(ptep);
+                /*
+                 * Make sure the buddy is global too (if it's !none,
+                 * it better already be global)
+                 */
+                if (pte_none(*buddy))
+                        pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
+        }
+#endif
+}
+#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
+
+static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
+        /* Preserve global status for the pair */
+        if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
+                set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
+        else
+#endif
+                set_pte_at(mm, addr, ptep, __pte(0));
+}
+#endif
+
+/*
+ * (pmds are folded into puds so this doesn't get actually called,
+ * but the define is needed for a generic inline function.)
+ */
+#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
+
+#ifdef CONFIG_64BIT
+/*
+ * (puds are folded into pgds so this doesn't get actually called,
+ * but the define is needed for a generic inline function.)
+ */
+#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
+#endif
+
+#define PGD_T_LOG2      (__builtin_ffs(sizeof(pgd_t)) - 1)
+#define PMD_T_LOG2      (__builtin_ffs(sizeof(pmd_t)) - 1)
+#define PTE_T_LOG2      (__builtin_ffs(sizeof(pte_t)) - 1)
+
+/*
+ * We used to declare this array with size but gcc 3.3 and older are not able
+ * to find that this expression is a constant, so the size is dropped.
+ */
+extern pgd_t swapper_pg_dir[];
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
+static inline int pte_write(pte_t pte)  { return pte.pte_low & _PAGE_WRITE; }
+static inline int pte_dirty(pte_t pte)  { return pte.pte_low & _PAGE_MODIFIED; }
+static inline int pte_young(pte_t pte)  { return pte.pte_low & _PAGE_ACCESSED; }
+static inline int pte_file(pte_t pte)   { return pte.pte_low & _PAGE_FILE; }
+
+static inline pte_t pte_wrprotect(pte_t pte)
+{
+        pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
+        pte.pte_high &= ~_PAGE_SILENT_WRITE;
+        return pte;
+}
+
+static inline pte_t pte_mkclean(pte_t pte)
+{
+        pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
+        pte.pte_high &= ~_PAGE_SILENT_WRITE;
+        return pte;
+}
+
+static inline pte_t pte_mkold(pte_t pte)
+{
+        pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
+        pte.pte_high &= ~_PAGE_SILENT_READ;
+        return pte;
+}
+
+static inline pte_t pte_mkwrite(pte_t pte)
+{
+        pte.pte_low |= _PAGE_WRITE;
+        if (pte.pte_low & _PAGE_MODIFIED) {
+                pte.pte_low  |= _PAGE_SILENT_WRITE;
+                pte.pte_high |= _PAGE_SILENT_WRITE;
+        }
+        return pte;
+}
+
+static inline pte_t pte_mkdirty(pte_t pte)
+{
+        pte.pte_low |= _PAGE_MODIFIED;
+        if (pte.pte_low & _PAGE_WRITE) {
+                pte.pte_low  |= _PAGE_SILENT_WRITE;
+                pte.pte_high |= _PAGE_SILENT_WRITE;
+        }
+        return pte;
+}
+
+static inline pte_t pte_mkyoung(pte_t pte)
+{
+        pte.pte_low |= _PAGE_ACCESSED;
+        if (pte.pte_low & _PAGE_READ) {
+                pte.pte_low  |= _PAGE_SILENT_READ;
+                pte.pte_high |= _PAGE_SILENT_READ;
+        }
+        return pte;
+}
+#else
+static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
+static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_MODIFIED; }
+static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
+static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
+
+static inline pte_t pte_wrprotect(pte_t pte)
+{
+        pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
+        return pte;
+}
+
+static inline pte_t pte_mkclean(pte_t pte)
+{
+        pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
+        return pte;
+}
+
+static inline pte_t pte_mkold(pte_t pte)
+{
+        pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
+        return pte;
+}
+
+static inline pte_t pte_mkwrite(pte_t pte)
+{
+        pte_val(pte) |= _PAGE_WRITE;
+        if (pte_val(pte) & _PAGE_MODIFIED)
+                pte_val(pte) |= _PAGE_SILENT_WRITE;
+        return pte;
+}
+
+static inline pte_t pte_mkdirty(pte_t pte)
+{
+        pte_val(pte) |= _PAGE_MODIFIED;
+        if (pte_val(pte) & _PAGE_WRITE)
+                pte_val(pte) |= _PAGE_SILENT_WRITE;
+        return pte;
+}
+
+static inline pte_t pte_mkyoung(pte_t pte)
+{
+        pte_val(pte) |= _PAGE_ACCESSED;
+        if (pte_val(pte) & _PAGE_READ)
+                pte_val(pte) |= _PAGE_SILENT_READ;
+        return pte;
+}
+#endif
+static inline int pte_special(pte_t pte)        { return 0; }
+static inline pte_t pte_mkspecial(pte_t pte)    { return pte; }
+
+/*
+ * Macro to make mark a page protection value as "uncacheable".  Note
+ * that "protection" is really a misnomer here as the protection value
+ * contains the memory attribute bits, dirty bits, and various other
+ * bits as well.
+ */
+#define pgprot_noncached pgprot_noncached
+
+static inline pgprot_t pgprot_noncached(pgprot_t _prot)
+{
+        unsigned long prot = pgprot_val(_prot);
+
+        prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
+
+        return __pgprot(prot);
+}
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
+#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
+
+#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{
+        pte.pte_low  &= _PAGE_CHG_MASK;
+        pte.pte_high &= ~0x3f;
+        pte.pte_low  |= pgprot_val(newprot);
+        pte.pte_high |= pgprot_val(newprot) & 0x3f;
+        return pte;
+}
+#else
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{
+        return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
+}
+#endif
+
+
+extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
+        pte_t pte);
+extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
+        pte_t pte);
+
+static inline void update_mmu_cache(struct vm_area_struct *vma,
+        unsigned long address, pte_t pte)
+{
+        __update_tlb(vma, address, pte);
+        __update_cache(vma, address, pte);
+}
+
+#define kern_addr_valid(addr)   (1)
+
+#ifdef CONFIG_64BIT_PHYS_ADDR
+extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
+
+static inline int io_remap_pfn_range(struct vm_area_struct *vma,
+                unsigned long vaddr,
+                unsigned long pfn,
+                unsigned long size,
+                pgprot_t prot)
+{
+        phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
+        return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
+}
+#else
+#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
+                remap_pfn_range(vma, vaddr, pfn, size, prot)
+#endif
+
+#include <asm-generic/pgtable.h>
+
+/*
+ * We provide our own get_unmapped area to cope with the virtual aliasing
+ * constraints placed on us by the cache architecture.
+ */
+#define HAVE_ARCH_UNMAPPED_AREA
+
+/*
+ * No page table caches to initialise
+ */
+#define pgtable_cache_init()    do { } while (0)
+
+#endif /* _ASM_PGTABLE_H */