1 files changed, 299 insertions, 0 deletions

diff --git a/include/asm-sh/pgtable_64.h b/include/asm-sh/pgtable_64.h
new file mode 100644
index 000000000000..972211671c9a
--- /dev/null
+++ b/include/asm-sh/pgtable_64.h
@@ -0,0 +1,299 @@
+#ifndef __ASM_SH_PGTABLE_64_H
+#define __ASM_SH_PGTABLE_64_H
+
+/*
+ * include/asm-sh/pgtable_64.h
+ *
+ * This file contains the functions and defines necessary to modify and use
+ * the SuperH page table tree.
+ *
+ * Copyright (C) 2000, 2001  Paolo Alberelli
+ * Copyright (C) 2003, 2004  Paul Mundt
+ * Copyright (C) 2003, 2004  Richard Curnow
+ *
+ * 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.
+ */
+#include <linux/threads.h>
+#include <asm/processor.h>
+#include <asm/page.h>
+
+/*
+ * Error outputs.
+ */
+#define pte_ERROR(e) \
+        printk("%s:%d: bad pte %016Lx.\n", __FILE__, __LINE__, pte_val(e))
+#define pgd_ERROR(e) \
+        printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
+
+/*
+ * Table setting routines. Used within arch/mm only.
+ */
+#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
+
+static __inline__ void set_pte(pte_t *pteptr, pte_t pteval)
+{
+        unsigned long long x = ((unsigned long long) pteval.pte_low);
+        unsigned long long *xp = (unsigned long long *) pteptr;
+        /*
+         * Sign-extend based on NPHYS.
+         */
+        *(xp) = (x & NPHYS_SIGN) ? (x | NPHYS_MASK) : x;
+}
+#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+static __inline__ void pmd_set(pmd_t *pmdp,pte_t *ptep)
+{
+        pmd_val(*pmdp) = (unsigned long) ptep;
+}
+
+/*
+ * PGD defines. Top level.
+ */
+
+/* To find an entry in a generic PGD. */
+#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
+#define __pgd_offset(address) pgd_index(address)
+#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
+
+/* To find an entry in a kernel PGD. */
+#define pgd_offset_k(address) pgd_offset(&init_mm, address)
+
+/*
+ * PMD level access routines. Same notes as above.
+ */
+#define _PMD_EMPTY              0x0
+/* Either the PMD is empty or present, it's not paged out */
+#define pmd_present(pmd_entry)  (pmd_val(pmd_entry) & _PAGE_PRESENT)
+#define pmd_clear(pmd_entry_p)  (set_pmd((pmd_entry_p), __pmd(_PMD_EMPTY)))
+#define pmd_none(pmd_entry)     (pmd_val((pmd_entry)) == _PMD_EMPTY)
+#define pmd_bad(pmd_entry)      ((pmd_val(pmd_entry) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
+
+#define pmd_page_vaddr(pmd_entry) \
+        ((unsigned long) __va(pmd_val(pmd_entry) & PAGE_MASK))
+
+#define pmd_page(pmd) \
+        (virt_to_page(pmd_val(pmd)))
+
+/* PMD to PTE dereferencing */
+#define pte_index(address) \
+                ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
+
+#define pte_offset_kernel(dir, addr) \
+                ((pte_t *) ((pmd_val(*(dir))) & PAGE_MASK) + pte_index((addr)))
+
+#define pte_offset_map(dir,addr)        pte_offset_kernel(dir, addr)
+#define pte_offset_map_nested(dir,addr) pte_offset_kernel(dir, addr)
+#define pte_unmap(pte)          do { } while (0)
+#define pte_unmap_nested(pte)   do { } while (0)
+
+#ifndef __ASSEMBLY__
+#define IOBASE_VADDR    0xff000000
+#define IOBASE_END      0xffffffff
+
+/*
+ * PTEL coherent flags.
+ * See Chapter 17 ST50 CPU Core Volume 1, Architecture.
+ */
+/* The bits that are required in the SH-5 TLB are placed in the h/w-defined
+   positions, to avoid expensive bit shuffling on every refill.  The remaining
+   bits are used for s/w purposes and masked out on each refill.
+
+   Note, the PTE slots are used to hold data of type swp_entry_t when a page is
+   swapped out.  Only the _PAGE_PRESENT flag is significant when the page is
+   swapped out, and it must be placed so that it doesn't overlap either the
+   type or offset fields of swp_entry_t.  For x86, offset is at [31:8] and type
+   at [6:1], with _PAGE_PRESENT at bit 0 for both pte_t and swp_entry_t.  This
+   scheme doesn't map to SH-5 because bit [0] controls cacheability.  So bit
+   [2] is used for _PAGE_PRESENT and the type field of swp_entry_t is split
+   into 2 pieces.  That is handled by SWP_ENTRY and SWP_TYPE below. */
+#define _PAGE_WT        0x001  /* CB0: if cacheable, 1->write-thru, 0->write-back */
+#define _PAGE_DEVICE    0x001  /* CB0: if uncacheable, 1->device (i.e. no write-combining or reordering at bus level) */
+#define _PAGE_CACHABLE  0x002  /* CB1: uncachable/cachable */
+#define _PAGE_PRESENT   0x004  /* software: page referenced */
+#define _PAGE_FILE      0x004  /* software: only when !present */
+#define _PAGE_SIZE0     0x008  /* SZ0-bit : size of page */
+#define _PAGE_SIZE1     0x010  /* SZ1-bit : size of page */
+#define _PAGE_SHARED    0x020  /* software: reflects PTEH's SH */
+#define _PAGE_READ      0x040  /* PR0-bit : read access allowed */
+#define _PAGE_EXECUTE   0x080  /* PR1-bit : execute access allowed */
+#define _PAGE_WRITE     0x100  /* PR2-bit : write access allowed */
+#define _PAGE_USER      0x200  /* PR3-bit : user space access allowed */
+#define _PAGE_DIRTY     0x400  /* software: page accessed in write */
+#define _PAGE_ACCESSED  0x800  /* software: page referenced */
+
+/* Mask which drops software flags */
+#define _PAGE_FLAGS_HARDWARE_MASK       0xfffffffffffff3dbLL
+
+/*
+ * HugeTLB support
+ */
+#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
+#define _PAGE_SZHUGE    (_PAGE_SIZE0)
+#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
+#define _PAGE_SZHUGE    (_PAGE_SIZE1)
+#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
+#define _PAGE_SZHUGE    (_PAGE_SIZE0 | _PAGE_SIZE1)
+#endif
+
+/*
+ * Default flags for a Kernel page.
+ * This is fundametally also SHARED because the main use of this define
+ * (other than for PGD/PMD entries) is for the VMALLOC pool which is
+ * contextless.
+ *
+ * _PAGE_EXECUTE is required for modules
+ *
+ */
+#define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
+                         _PAGE_EXECUTE | \
+                         _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_DIRTY | \
+                         _PAGE_SHARED)
+
+/* Default flags for a User page */
+#define _PAGE_TABLE     (_KERNPG_TABLE | _PAGE_USER)
+
+#define _PAGE_CHG_MASK  (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
+
+/*
+ * We have full permissions (Read/Write/Execute/Shared).
+ */
+#define _PAGE_COMMON    (_PAGE_PRESENT | _PAGE_USER | \
+                         _PAGE_CACHABLE | _PAGE_ACCESSED)
+
+#define PAGE_NONE       __pgprot(_PAGE_CACHABLE | _PAGE_ACCESSED)
+#define PAGE_SHARED     __pgprot(_PAGE_COMMON | _PAGE_READ | _PAGE_WRITE | \
+                                 _PAGE_SHARED)
+#define PAGE_EXECREAD   __pgprot(_PAGE_COMMON | _PAGE_READ | _PAGE_EXECUTE)
+
+/*
+ * We need to include PAGE_EXECUTE in PAGE_COPY because it is the default
+ * protection mode for the stack.
+ */
+#define PAGE_COPY       PAGE_EXECREAD
+
+#define PAGE_READONLY   __pgprot(_PAGE_COMMON | _PAGE_READ)
+#define PAGE_WRITEONLY  __pgprot(_PAGE_COMMON | _PAGE_WRITE)
+#define PAGE_RWX        __pgprot(_PAGE_COMMON | _PAGE_READ | \
+                                 _PAGE_WRITE | _PAGE_EXECUTE)
+#define PAGE_KERNEL     __pgprot(_KERNPG_TABLE)
+
+/* Make it a device mapping for maximum safety (e.g. for mapping device
+   registers into user-space via /dev/map).  */
+#define pgprot_noncached(x) __pgprot(((x).pgprot & ~(_PAGE_CACHABLE)) | _PAGE_DEVICE)
+#define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
+
+/*
+ * Handling allocation failures during page table setup.
+ */
+extern void __handle_bad_pmd_kernel(pmd_t * pmd);
+#define __handle_bad_pmd(x)     __handle_bad_pmd_kernel(x)
+
+/*
+ * PTE level access routines.
+ *
+ * Note1:
+ * It's the tree walk leaf. This is physical address to be stored.
+ *
+ * Note 2:
+ * Regarding the choice of _PTE_EMPTY:
+
+   We must choose a bit pattern that cannot be valid, whether or not the page
+   is present.  bit[2]==1 => present, bit[2]==0 => swapped out.  If swapped
+   out, bits [31:8], [6:3], [1:0] are under swapper control, so only bit[7] is
+   left for us to select.  If we force bit[7]==0 when swapped out, we could use
+   the combination bit[7,2]=2'b10 to indicate an empty PTE.  Alternatively, if
+   we force bit[7]==1 when swapped out, we can use all zeroes to indicate
+   empty.  This is convenient, because the page tables get cleared to zero
+   when they are allocated.
+
+ */
+#define _PTE_EMPTY      0x0
+#define pte_present(x)  (pte_val(x) & _PAGE_PRESENT)
+#define pte_clear(mm,addr,xp)   (set_pte_at(mm, addr, xp, __pte(_PTE_EMPTY)))
+#define pte_none(x)     (pte_val(x) == _PTE_EMPTY)
+
+/*
+ * Some definitions to translate between mem_map, PTEs, and page
+ * addresses:
+ */
+
+/*
+ * Given a PTE, return the index of the mem_map[] entry corresponding
+ * to the page frame the PTE. Get the absolute physical address, make
+ * a relative physical address and translate it to an index.
+ */
+#define pte_pagenr(x)           (((unsigned long) (pte_val(x)) - \
+                                 __MEMORY_START) >> PAGE_SHIFT)
+
+/*
+ * Given a PTE, return the "struct page *".
+ */
+#define pte_page(x)             (mem_map + pte_pagenr(x))
+
+/*
+ * Return number of (down rounded) MB corresponding to x pages.
+ */
+#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
+
+
+/*
+ * The following have defined behavior only work if pte_present() is true.
+ */
+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_WRITE; }
+
+static inline pte_t pte_wrprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_WRITE)); 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_mkwrite(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_WRITE)); 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_mkhuge(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_SZHUGE)); return pte; }
+
+
+/*
+ * Conversion functions: convert a page and protection to a page entry.
+ *
+ * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
+ */
+#define mk_pte(page,pgprot)                                                     \
+({                                                                              \
+        pte_t __pte;                                                            \
+                                                                                \
+        set_pte(&__pte, __pte((((page)-mem_map) << PAGE_SHIFT) |                \
+                __MEMORY_START | pgprot_val((pgprot))));                        \
+        __pte;                                                                  \
+})
+
+/*
+ * This takes a (absolute) physical page address that is used
+ * by the remapping functions
+ */
+#define mk_pte_phys(physpage, pgprot) \
+({ pte_t __pte; set_pte(&__pte, __pte(physpage | pgprot_val(pgprot))); __pte; })
+
+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; }
+
+/* Encode and decode a swap entry */
+#define __swp_type(x)                   (((x).val & 3) + (((x).val >> 1) & 0x3c))
+#define __swp_offset(x)                 ((x).val >> 8)
+#define __swp_entry(type, offset)       ((swp_entry_t) { ((offset << 8) + ((type & 0x3c) << 1) + (type & 3)) })
+#define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
+#define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
+
+/* Encode and decode a nonlinear file mapping entry */
+#define PTE_FILE_MAX_BITS               29
+#define pte_to_pgoff(pte)               (pte_val(pte))
+#define pgoff_to_pte(off)               ((pte_t) { (off) | _PAGE_FILE })
+
+#endif /* !__ASSEMBLY__ */
+
+#define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
+#define pfn_pmd(pfn, prot)      __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
+
+#endif /* __ASM_SH_PGTABLE_64_H */