1 files changed, 243 insertions, 0 deletions

diff --git a/include/asm-mips/pgtable-32.h b/include/asm-mips/pgtable-32.h
new file mode 100644
index 000000000000..41a0df7d7768
--- /dev/null
+++ b/include/asm-mips/pgtable-32.h
@@ -0,0 +1,243 @@
+/*
+ * 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) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
+ * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
+ */
+#ifndef _ASM_PGTABLE_32_H
+#define _ASM_PGTABLE_32_H
+
+#include <linux/config.h>
+#include <asm/addrspace.h>
+#include <asm/page.h>
+
+#include <linux/linkage.h>
+#include <asm/cachectl.h>
+#include <asm/fixmap.h>
+
+/*
+ * - add_wired_entry() add a fixed TLB entry, and move wired register
+ */
+extern void add_wired_entry(unsigned long entrylo0, unsigned long entrylo1,
+                               unsigned long entryhi, unsigned long pagemask);
+
+/*
+ * - add_temporary_entry() add a temporary TLB entry. We use TLB entries
+ *      starting at the top and working down. This is for populating the
+ *      TLB before trap_init() puts the TLB miss handler in place. It
+ *      should be used only for entries matching the actual page tables,
+ *      to prevent inconsistencies.
+ */
+extern int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1,
+                               unsigned long entryhi, unsigned long pagemask);
+
+
+/* Basically we have the same two-level (which is the logical three level
+ * Linux page table layout folded) page tables as the i386.  Some day
+ * when we have proper page coloring support we can have a 1% quicker
+ * tlb refill handling mechanism, but for now it is a bit slower but
+ * works even with the cache aliasing problem the R4k and above have.
+ */
+
+/* PMD_SHIFT determines the size of the area a second-level page table can map */
+#ifdef CONFIG_64BIT_PHYS_ADDR
+#define PMD_SHIFT       21
+#else
+#define PMD_SHIFT       22
+#endif
+#define PMD_SIZE        (1UL << PMD_SHIFT)
+#define PMD_MASK        (~(PMD_SIZE-1))
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+#define PGDIR_SHIFT     PMD_SHIFT
+#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
+#define PGDIR_MASK      (~(PGDIR_SIZE-1))
+
+/*
+ * Entries per page directory level: we use two-level, so
+ * we don't really have any PMD directory physically.
+ */
+#ifdef CONFIG_64BIT_PHYS_ADDR
+#define PGD_ORDER       1
+#define PMD_ORDER       0
+#define PTE_ORDER       0
+#else
+#define PGD_ORDER       0
+#define PMD_ORDER       0
+#define PTE_ORDER       0
+#endif
+
+#define PTRS_PER_PGD    ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
+#define PTRS_PER_PMD    1
+#define PTRS_PER_PTE    ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
+
+#define USER_PTRS_PER_PGD       (0x80000000UL/PGDIR_SIZE)
+#define FIRST_USER_PGD_NR       0
+
+#define VMALLOC_START     KSEG2
+
+#ifdef CONFIG_HIGHMEM
+# define VMALLOC_END    (PKMAP_BASE-2*PAGE_SIZE)
+#else
+# define VMALLOC_END    (FIXADDR_START-2*PAGE_SIZE)
+#endif
+
+#ifdef CONFIG_64BIT_PHYS_ADDR
+#define pte_ERROR(e) \
+        printk("%s:%d: bad pte %016Lx.\n", __FILE__, __LINE__, pte_val(e))
+#else
+#define pte_ERROR(e) \
+        printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
+#endif
+#define pmd_ERROR(e) \
+        printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
+#define pgd_ERROR(e) \
+        printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
+
+extern void load_pgd(unsigned long pg_dir);
+
+extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
+
+/*
+ * 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);
+}
+
+/*
+ * The "pgd_xxx()" functions here are trivial for a folded two-level
+ * setup: the pgd is never bad, and a pmd always exists (as it's folded
+ * into the pgd entry)
+ */
+static inline int pgd_none(pgd_t pgd)           { return 0; }
+static inline int pgd_bad(pgd_t pgd)            { return 0; }
+static inline int pgd_present(pgd_t pgd)        { return 1; }
+static inline void pgd_clear(pgd_t *pgdp)       { }
+
+#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
+#define pte_page(x)             pfn_to_page(pte_pfn(x))
+#define pte_pfn(x)              ((unsigned long)((x).pte_high >> 6))
+static inline pte_t
+pfn_pte(unsigned long pfn, pgprot_t prot)
+{
+        pte_t pte;
+        pte.pte_high = (pfn << 6) | (pgprot_val(prot) & 0x3f);
+        pte.pte_low = pgprot_val(prot);
+        return pte;
+}
+
+#else
+
+#define pte_page(x)             pfn_to_page(pte_pfn(x))
+
+#ifdef CONFIG_CPU_VR41XX
+#define pte_pfn(x)              ((unsigned long)((x).pte >> (PAGE_SHIFT + 2)))
+#define pfn_pte(pfn, prot)      __pte(((pfn) << (PAGE_SHIFT + 2)) | pgprot_val(prot))
+#else
+#define pte_pfn(x)              ((unsigned long)((x).pte >> PAGE_SHIFT))
+#define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
+#endif
+#endif /* defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32) */
+
+#define __pgd_offset(address)   pgd_index(address)
+#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)
+
+/* to find an entry in a page-table-directory */
+#define pgd_offset(mm,addr)     ((mm)->pgd + pgd_index(addr))
+
+/* Find an entry in the second-level page table.. */
+static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address)
+{
+        return (pmd_t *) dir;
+}
+
+/* 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_kernel(*dir)) + __pte_offset(address))
+#define pte_offset_kernel(dir, address) \
+        ((pte_t *) pmd_page_kernel(*(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))
+
+#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
+
+/* Swap entries must have VALID bit cleared. */
+#define __swp_type(x)           (((x).val >> 10) & 0x1f)
+#define __swp_offset(x)         ((x).val >> 15)
+#define __swp_entry(type,offset)        \
+        ((swp_entry_t) { ((type) << 10) | ((offset) << 15) })
+
+/*
+ * Bits 0, 1, 2, 9 and 10 are taken, split up the 27 bits of offset
+ * into this range:
+ */
+#define PTE_FILE_MAX_BITS       27
+
+#define pte_to_pgoff(_pte) \
+        ((((_pte).pte >> 3) & 0x3f ) + (((_pte).pte >> 11) << 8 ))
+
+#define pgoff_to_pte(off) \
+        ((pte_t) { (((off) & 0x3f) << 3) + (((off) >> 8) << 11) + _PAGE_FILE })
+
+#else
+
+/* Swap entries must have VALID and GLOBAL bits cleared. */
+#define __swp_type(x)           (((x).val >> 8) & 0x1f)
+#define __swp_offset(x)         ((x).val >> 13)
+#define __swp_entry(type,offset)        \
+                ((swp_entry_t) { ((type) << 8) | ((offset) << 13) })
+
+/*
+ * Bits 0, 1, 2, 7 and 8 are taken, split up the 27 bits of offset
+ * into this range:
+ */
+#define PTE_FILE_MAX_BITS       27
+
+#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
+        /* fixme */
+#define pte_to_pgoff(_pte) (((_pte).pte_high >> 6) + ((_pte).pte_high & 0x3f))
+#define pgoff_to_pte(off) \
+        ((pte_t){(((off) & 0x3f) + ((off) << 6) + _PAGE_FILE)})
+
+#else
+#define pte_to_pgoff(_pte) \
+        ((((_pte).pte >> 3) & 0x1f ) + (((_pte).pte >> 9) << 6 ))
+
+#define pgoff_to_pte(off) \
+        ((pte_t) { (((off) & 0x1f) << 3) + (((off) >> 6) << 9) + _PAGE_FILE })
+#endif
+
+#endif
+
+#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
+#define __swp_entry_to_pte(x)   ((pte_t) { (x).val })
+
+#endif /* _ASM_PGTABLE_32_H */