1 files changed, 404 insertions, 0 deletions

diff --git a/include/asm-mips/pgtable.h b/include/asm-mips/pgtable.h
new file mode 100644
index 000000000000..878843203d67
--- /dev/null
+++ b/include/asm-mips/pgtable.h
@@ -0,0 +1,404 @@
+/*
+ * 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
+
+#include <asm-generic/4level-fixup.h>
+
+#include <linux/config.h>
+#ifdef CONFIG_MIPS32
+#include <asm/pgtable-32.h>
+#endif
+#ifdef CONFIG_MIPS64
+#include <asm/pgtable-64.h>
+#endif
+
+#include <asm/pgtable-bits.h>
+
+#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..
+ */
+#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
+
+/*
+ * 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(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 page_pte(page)          page_pte_prot(page, __pgprot(0))
+#define pmd_phys(pmd)           (pmd_val(pmd) - PAGE_OFFSET)
+#define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
+#define pmd_page_kernel(pmd)    pmd_val(pmd)
+
+#define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
+#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
+
+#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
+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_val(pte) & _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;
+        }
+}
+#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)
+{
+        /* Preserve global status for the pair */
+        if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
+                set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
+        else
+                set_pte_at(mm, addr, ptep, __pte(0));
+}
+#else
+/*
+ * 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 pgds 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)
+#define set_pgd(pgdptr, pgdval) do { *(pgdptr) = (pgdval); } while(0)
+
+#define PGD_T_LOG2      ffz(~sizeof(pgd_t))
+#define PMD_T_LOG2      ffz(~sizeof(pmd_t))
+#define PTE_T_LOG2      ffz(~sizeof(pte_t))
+
+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+static inline int pte_user(pte_t pte)   { BUG(); return 0; }
+#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
+static inline int pte_read(pte_t pte)   { return (pte).pte_low & _PAGE_READ; }
+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_rdprotect(pte_t pte)
+{
+        (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
+        (pte).pte_high &= ~_PAGE_SILENT_READ;
+        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_mkread(pte_t pte)
+{
+        (pte).pte_low |= _PAGE_READ;
+        if ((pte).pte_low & _PAGE_ACCESSED) {
+                (pte).pte_low |= _PAGE_SILENT_READ;
+                (pte).pte_high |= _PAGE_SILENT_READ;
+        }
+        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_read(pte_t pte)   { return pte_val(pte) & _PAGE_READ; }
+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_rdprotect(pte_t pte)
+{
+        pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
+        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_mkread(pte_t pte)
+{
+        pte_val(pte) |= _PAGE_READ;
+        if (pte_val(pte) & _PAGE_ACCESSED)
+                pte_val(pte) |= _PAGE_SILENT_READ;
+        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
+
+/*
+ * 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_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);
+}
+
+#ifndef CONFIG_DISCONTIGMEM
+#define kern_addr_valid(addr)   (1)
+#endif
+
+#ifdef CONFIG_64BIT_PHYS_ADDR
+extern phys_t fixup_bigphys_addr(phys_t phys_addr, phys_t size);
+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_page_range(struct vm_area_struct *vma,
+                unsigned long vaddr,
+                unsigned long paddr,
+                unsigned long size,
+                pgprot_t prot)
+{
+        phys_t phys_addr_high = fixup_bigphys_addr(paddr, size);
+        return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, 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, pfn, size, prot);
+}
+#else
+#define io_remap_page_range(vma, vaddr, paddr, size, prot)              \
+                remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
+#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
+                remap_pfn_range(vma, vaddr, pfn, size, prot)
+#endif
+
+#define MK_IOSPACE_PFN(space, pfn)      (pfn)
+#define GET_IOSPACE(pfn)                0
+#define GET_PFN(pfn)                    (pfn)
+
+#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 */