1 files changed, 267 insertions, 0 deletions

diff --git a/arch/score/include/asm/pgtable.h b/arch/score/include/asm/pgtable.h
new file mode 100644
index 000000000000..0f7177a42205
--- /dev/null
+++ b/arch/score/include/asm/pgtable.h
@@ -0,0 +1,267 @@
+#ifndef _ASM_SCORE_PGTABLE_H
+#define _ASM_SCORE_PGTABLE_H
+
+#include <linux/const.h>
+#include <asm-generic/pgtable-nopmd.h>
+
+#include <asm/fixmap.h>
+#include <asm/setup.h>
+#include <asm/pgtable-bits.h>
+
+extern void load_pgd(unsigned long pg_dir);
+extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+#define PGDIR_SHIFT     22
+#define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
+#define PGDIR_MASK      (~(PGDIR_SIZE - 1))
+
+/*
+ * Entries per page directory level: we use two-level, so
+ * we don't really have any PUD/PMD directory physically.
+ */
+#define PGD_ORDER       0
+#define PTE_ORDER       0
+
+#define PTRS_PER_PGD    1024
+#define PTRS_PER_PTE    1024
+
+#define USER_PTRS_PER_PGD       (0x80000000UL/PGDIR_SIZE)
+#define FIRST_USER_ADDRESS      0
+
+#define VMALLOC_START           (0xc0000000UL)
+
+#define PKMAP_BASE              (0xfd000000UL)
+
+#define VMALLOC_END             (FIXADDR_START - 2*PAGE_SIZE)
+
+#define pte_ERROR(e) \
+        printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
+                __FILE__, __LINE__, pte_val(e))
+#define pgd_ERROR(e) \
+        printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
+                __FILE__, __LINE__, pgd_val(e))
+
+/*
+ * Empty pgd/pmd entries point to the invalid_pte_table.
+ */
+static inline int pmd_none(pmd_t pmd)
+{
+        return pmd_val(pmd) == (unsigned long) invalid_pte_table;
+}
+
+#define pmd_bad(pmd)            (pmd_val(pmd) & ~PAGE_MASK)
+
+static inline int pmd_present(pmd_t pmd)
+{
+        return pmd_val(pmd) != (unsigned long) invalid_pte_table;
+}
+
+static inline void pmd_clear(pmd_t *pmdp)
+{
+        pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
+}
+
+#define pte_page(x)             pfn_to_page(pte_pfn(x))
+#define pte_pfn(x)              ((unsigned long)((x).pte >> PAGE_SHIFT))
+#define pfn_pte(pfn, prot)      \
+        __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
+
+#define __pgd_offset(address)   pgd_index(address)
+#define __pud_offset(address)   (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
+#define __pmd_offset(address)   (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
+
+/* to find an entry in a kernel page-table-directory */
+#define pgd_offset_k(address)   pgd_offset(&init_mm, address)
+#define pgd_index(address)      (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
+
+/* to find an entry in a page-table-directory */
+#define pgd_offset(mm, addr)    ((mm)->pgd + pgd_index(addr))
+
+/* Find an entry in the third-level page table.. */
+#define __pte_offset(address)           \
+        (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
+#define pte_offset(dir, address)        \
+        ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
+#define pte_offset_kernel(dir, address) \
+        ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
+
+#define pte_offset_map(dir, address)    \
+        ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
+#define pte_offset_map_nested(dir, address)     \
+        ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
+#define pte_unmap(pte) ((void)(pte))
+#define pte_unmap_nested(pte) ((void)(pte))
+
+/*
+ * Bits 9(_PAGE_PRESENT) and 10(_PAGE_FILE)are taken,
+ * split up 30 bits of offset into this range:
+ */
+#define PTE_FILE_MAX_BITS       30
+#define pte_to_pgoff(_pte)              \
+        (((_pte).pte & 0x1ff) | (((_pte).pte >> 11) << 9))
+#define pgoff_to_pte(off)               \
+        ((pte_t) {((off) & 0x1ff) | (((off) >> 9) << 11) | _PAGE_FILE})
+#define __pte_to_swp_entry(pte)         \
+        ((swp_entry_t) { pte_val(pte)})
+#define __swp_entry_to_pte(x)   ((pte_t) {(x).val})
+
+#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)
+
+#define pmd_page(pmd) virt_to_page(__va(pmd_val(pmd)))
+#define mk_pte(page, prot)      pfn_pte(page_to_pfn(page), prot)
+static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
+
+#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
+#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
+#define pte_clear(mm, addr, xp)         \
+        do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
+
+#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
+                remap_pfn_range(vma, vaddr, pfn, size, prot)
+
+#define pgd_present(pgd)        (1) /* pages are always present on non MMU */
+#define pgd_none(pgd)           (0)
+#define pgd_bad(pgd)            (0)
+#define pgd_clear(pgdp)
+
+#define kern_addr_valid(addr)   (1)
+#define pmd_offset(a, b)        ((void *) 0)
+#define pmd_page_vaddr(pmd)     pmd_val(pmd)
+
+#define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
+#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
+
+#define pud_offset(pgd, address) ((pud_t *) pgd)
+
+#define PAGE_NONE               __pgprot(0) /* these mean nothing to non MMU */
+#define PAGE_SHARED             __pgprot(0) /* these mean nothing to non MMU */
+#define PAGE_COPY               __pgprot(0) /* these mean nothing to non MMU */
+#define PAGE_READONLY           __pgprot(0) /* these mean nothing to non MMU */
+#define PAGE_KERNEL             __pgprot(0) /* these mean nothing to non MMU */
+
+#define pgprot_noncached(x)     (x)
+
+#define __swp_type(x)           (0)
+#define __swp_offset(x)         (0)
+#define __swp_entry(typ, off)   ((swp_entry_t) { ((typ) | ((off) << 7)) })
+
+#define ZERO_PAGE(vaddr)        ({ BUG(); NULL; })
+
+#define swapper_pg_dir ((pgd_t *) NULL)
+
+#define pgtable_cache_init()    do {} while (0)
+
+#define arch_enter_lazy_cpu_mode()      do {} while (0)
+
+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;
+}
+
+#define pte_special(pte)        (0)
+
+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;
+}
+
+#define set_pmd(pmdptr, pmdval)         \
+         do { *(pmdptr) = (pmdval); } while (0)
+#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
+
+extern unsigned long pgd_current;
+extern void paging_init(void);
+
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{
+        return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
+}
+
+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 __ASSEMBLY__
+#include <asm-generic/pgtable.h>
+
+void setup_memory(void);
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_SCORE_PGTABLE_H */