1 files changed, 306 insertions, 0 deletions

diff --git a/include/asm-sh/pgtable.h b/include/asm-sh/pgtable.h
new file mode 100644
index 000000000000..8a9689d5366f
--- /dev/null
+++ b/include/asm-sh/pgtable.h
@@ -0,0 +1,306 @@
+#ifndef __ASM_SH_PGTABLE_H
+#define __ASM_SH_PGTABLE_H
+
+#include <asm-generic/4level-fixup.h>
+
+/*
+ * Copyright (C) 1999 Niibe Yutaka
+ * Copyright (C) 2002, 2003, 2004 Paul Mundt
+ */
+
+#include <linux/config.h>
+#include <asm/pgtable-2level.h>
+
+/*
+ * This file contains the functions and defines necessary to modify and use
+ * the SuperH page table tree.
+ */
+#ifndef __ASSEMBLY__
+#include <asm/processor.h>
+#include <asm/addrspace.h>
+#include <asm/fixmap.h>
+#include <linux/threads.h>
+
+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+extern void paging_init(void);
+
+/*
+ * Basically we have the same two-level (which is the logical three level
+ * Linux page table layout folded) page tables as the i386.
+ */
+
+/*
+ * ZERO_PAGE is a global shared page that is always zero: used
+ * for zero-mapped memory areas etc..
+ */
+extern unsigned long empty_zero_page[1024];
+#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
+
+#endif /* !__ASSEMBLY__ */
+
+#define PMD_SIZE        (1UL << PMD_SHIFT)
+#define PMD_MASK        (~(PMD_SIZE-1))
+#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
+#define PGDIR_MASK      (~(PGDIR_SIZE-1))
+
+#define USER_PTRS_PER_PGD       (TASK_SIZE/PGDIR_SIZE)
+#define FIRST_USER_PGD_NR       0
+
+#define PTE_PHYS_MASK   0x1ffff000
+
+#ifndef __ASSEMBLY__
+/*
+ * First 1MB map is used by fixed purpose.
+ * Currently only 4-enty (16kB) is used (see arch/sh/mm/cache.c)
+ */
+#define VMALLOC_START   (P3SEG+0x00100000)
+#define VMALLOC_END     (FIXADDR_START-2*PAGE_SIZE)
+
+#define _PAGE_WT        0x001  /* WT-bit on SH-4, 0 on SH-3 */
+#define _PAGE_HW_SHARED 0x002  /* SH-bit  : page is shared among processes */
+#define _PAGE_DIRTY     0x004  /* D-bit   : page changed */
+#define _PAGE_CACHABLE  0x008  /* C-bit   : cachable */
+#define _PAGE_SZ0       0x010  /* SZ0-bit : Size of page */
+#define _PAGE_RW        0x020  /* PR0-bit : write access allowed */
+#define _PAGE_USER      0x040  /* PR1-bit : user space access allowed */
+#define _PAGE_SZ1       0x080  /* SZ1-bit : Size of page (on SH-4) */
+#define _PAGE_PRESENT   0x100  /* V-bit   : page is valid */
+#define _PAGE_PROTNONE  0x200  /* software: if not present  */
+#define _PAGE_ACCESSED  0x400  /* software: page referenced */
+#define _PAGE_U0_SHARED 0x800  /* software: page is shared in user space */
+
+#define _PAGE_FILE      _PAGE_WT  /* software: pagecache or swap? */
+
+/* software: moves to PTEA.TC (Timing Control) */
+#define _PAGE_PCC_AREA5 0x00000000      /* use BSC registers for area5 */
+#define _PAGE_PCC_AREA6 0x80000000      /* use BSC registers for area6 */
+
+/* software: moves to PTEA.SA[2:0] (Space Attributes) */
+#define _PAGE_PCC_IODYN 0x00000001      /* IO space, dynamically sized bus */
+#define _PAGE_PCC_IO8   0x20000000      /* IO space, 8 bit bus */
+#define _PAGE_PCC_IO16  0x20000001      /* IO space, 16 bit bus */
+#define _PAGE_PCC_COM8  0x40000000      /* Common Memory space, 8 bit bus */
+#define _PAGE_PCC_COM16 0x40000001      /* Common Memory space, 16 bit bus */
+#define _PAGE_PCC_ATR8  0x60000000      /* Attribute Memory space, 8 bit bus */
+#define _PAGE_PCC_ATR16 0x60000001      /* Attribute Memory space, 6 bit bus */
+
+
+/* Mask which drop software flags
+ * We also drop WT bit since it is used for _PAGE_FILE
+ * bit in this implementation.
+ */
+#define _PAGE_CLEAR_FLAGS       (_PAGE_WT | _PAGE_PROTNONE | _PAGE_ACCESSED | _PAGE_U0_SHARED)
+
+#if defined(CONFIG_CPU_SH3)
+/*
+ * MMU on SH-3 has bug on SH-bit: We can't use it if MMUCR.IX=1.
+ * Work around: Just drop SH-bit.
+ */
+#define _PAGE_FLAGS_HARDWARE_MASK       (0x1fffffff & ~(_PAGE_CLEAR_FLAGS | _PAGE_HW_SHARED))
+#else
+#define _PAGE_FLAGS_HARDWARE_MASK       (0x1fffffff & ~(_PAGE_CLEAR_FLAGS))
+#endif
+
+/* Hardware flags: SZ0=1 (4k-byte) */
+#define _PAGE_FLAGS_HARD        _PAGE_SZ0
+
+#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
+#define _PAGE_SZHUGE    (_PAGE_SZ1)
+#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
+#define _PAGE_SZHUGE    (_PAGE_SZ0 | _PAGE_SZ1)
+#endif
+
+#define _PAGE_SHARED    _PAGE_U0_SHARED
+
+#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  (PTE_MASK | _PAGE_ACCESSED | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_SHARED)
+
+#ifdef CONFIG_MMU
+#define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_FLAGS_HARD)
+#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_CACHABLE |_PAGE_ACCESSED | _PAGE_SHARED | _PAGE_FLAGS_HARD)
+#define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
+#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_FLAGS_HARD)
+#define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
+#define PAGE_KERNEL_NOCACHE \
+                        __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
+#define PAGE_KERNEL_RO  __pgprot(_PAGE_PRESENT | _PAGE_CACHABLE | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_HW_SHARED | _PAGE_FLAGS_HARD)
+#define PAGE_KERNEL_PCC(slot, type) \
+                        __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_FLAGS_HARD | (slot ? _PAGE_PCC_AREA5 : _PAGE_PCC_AREA6) | (type))
+#else /* no mmu */
+#define PAGE_NONE               __pgprot(0)
+#define PAGE_SHARED             __pgprot(0)
+#define PAGE_COPY               __pgprot(0)
+#define PAGE_READONLY           __pgprot(0)
+#define PAGE_KERNEL             __pgprot(0)
+#define PAGE_KERNEL_NOCACHE     __pgprot(0)
+#define PAGE_KERNEL_RO          __pgprot(0)
+#define PAGE_KERNEL_PCC         __pgprot(0)
+#endif
+
+/*
+ * As i386 and MIPS, SuperH can't do page protection for execute, and
+ * considers that the same as a 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 pte_none(x)     (!pte_val(x))
+#define pte_present(x)  (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
+#define pte_clear(mm,addr,xp)   do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
+
+#define pmd_none(x)     (!pmd_val(x))
+#define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
+#define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
+#define pmd_bad(x)      ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
+
+#define pages_to_mb(x)  ((x) >> (20-PAGE_SHIFT))
+#define pte_page(x)     phys_to_page(pte_val(x)&PTE_PHYS_MASK)
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
+static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
+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_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
+static inline int pte_write(pte_t pte){ return pte_val(pte) & _PAGE_RW; }
+static inline int pte_not_present(pte_t pte){ return !(pte_val(pte) & _PAGE_PRESENT); }
+
+static inline pte_t pte_rdprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
+static inline pte_t pte_exprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
+static inline pte_t pte_mkclean(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
+static inline pte_t pte_mkold(pte_t pte)        { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
+static inline pte_t pte_wrprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
+static inline pte_t pte_mkread(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
+static inline pte_t pte_mkexec(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
+static inline pte_t pte_mkdirty(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
+static inline pte_t pte_mkyoung(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
+static inline pte_t pte_mkwrite(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
+
+/*
+ * Macro and implementation to make a page protection as uncachable.
+ */
+#define pgprot_noncached pgprot_noncached
+
+static inline pgprot_t pgprot_noncached(pgprot_t _prot)
+{
+        unsigned long prot = pgprot_val(_prot);
+
+        prot &= ~_PAGE_CACHABLE;
+        return __pgprot(prot);
+}
+
+#define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
+
+/*
+ * 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)
+ */
+#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
+
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{ set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot))); return pte; }
+
+#define page_pte(page) page_pte_prot(page, __pgprot(0))
+
+#define pmd_page_kernel(pmd) \
+((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
+
+#define pmd_page(pmd) \
+        (phys_to_page(pmd_val(pmd)))
+
+/* to find an entry in a page-table-directory. */
+#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
+#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
+
+/* to find an entry in a kernel page-table-directory */
+#define pgd_offset_k(address) pgd_offset(&init_mm, address)
+
+/* Find an entry in the third-level page table.. */
+#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_offset_kernel(dir, address)
+#define pte_offset_map_nested(dir, address) pte_offset_kernel(dir, address)
+#define pte_unmap(pte)          do { } while (0)
+#define pte_unmap_nested(pte)   do { } while (0)
+
+struct vm_area_struct;
+extern void update_mmu_cache(struct vm_area_struct * vma,
+                             unsigned long address, pte_t pte);
+
+/* Encode and de-code a swap entry */
+/*
+ * NOTE: We should set ZEROs at the position of _PAGE_PRESENT
+ *       and _PAGE_PROTNONE bits
+ */
+#define __swp_type(x)           ((x).val & 0xff)
+#define __swp_offset(x)         ((x).val >> 10)
+#define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 10) })
+#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 })
+#define __swp_entry_to_pte(x)   ((pte_t) { (x).val << 1 })
+
+/*
+ * Encode and decode a nonlinear file mapping entry
+ */
+#define PTE_FILE_MAX_BITS       29
+#define pte_to_pgoff(pte)       (pte_val(pte) >> 1)
+#define pgoff_to_pte(off)       ((pte_t) { ((off) << 1) | _PAGE_FILE })
+
+typedef pte_t *pte_addr_t;
+
+#endif /* !__ASSEMBLY__ */
+
+#define kern_addr_valid(addr)   (1)
+
+#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)
+
+#define MK_IOSPACE_PFN(space, pfn)      (pfn)
+#define GET_IOSPACE(pfn)                0
+#define GET_PFN(pfn)                    (pfn)
+
+/*
+ * No page table caches to initialise
+ */
+#define pgtable_cache_init()    do { } while (0)
+
+#ifndef CONFIG_MMU
+extern unsigned int kobjsize(const void *objp);
+#endif /* !CONFIG_MMU */
+
+#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB)
+#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
+extern pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep);
+#endif
+
+#include <asm-generic/pgtable.h>
+
+#endif /* __ASM_SH_PAGE_H */
+