Initial import

1 files changed, 240 insertions, 0 deletions

diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h
new file mode 100644
index 000000000..89dd7fed1
--- /dev/null
+++ b/arch/mips/include/asm/page.h
@@ -0,0 +1,240 @@
+/*
+ * 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 - 1999, 2000, 03 Ralf Baechle
+ * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ */
+#ifndef _ASM_PAGE_H
+#define _ASM_PAGE_H
+
+#include <spaces.h>
+#include <linux/const.h>
+#include <linux/kernel.h>
+#include <asm/mipsregs.h>
+
+/*
+ * PAGE_SHIFT determines the page size
+ */
+#ifdef CONFIG_PAGE_SIZE_4KB
+#define PAGE_SHIFT	12
+#endif
+#ifdef CONFIG_PAGE_SIZE_8KB
+#define PAGE_SHIFT	13
+#endif
+#ifdef CONFIG_PAGE_SIZE_16KB
+#define PAGE_SHIFT	14
+#endif
+#ifdef CONFIG_PAGE_SIZE_32KB
+#define PAGE_SHIFT	15
+#endif
+#ifdef CONFIG_PAGE_SIZE_64KB
+#define PAGE_SHIFT	16
+#endif
+#define PAGE_SIZE	(_AC(1,UL) << PAGE_SHIFT)
+#define PAGE_MASK	(~((1 << PAGE_SHIFT) - 1))
+
+/*
+ * This is used for calculating the real page sizes
+ * for FTLB or VTLB + FTLB configurations.
+ */
+static inline unsigned int page_size_ftlb(unsigned int mmuextdef)
+{
+	switch (mmuextdef) {
+	case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT:
+		if (PAGE_SIZE == (1 << 30))
+			return 5;
+		if (PAGE_SIZE == (1llu << 32))
+			return 6;
+		if (PAGE_SIZE > (256 << 10))
+			return 7; /* reserved */
+			/* fall through */
+	case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT:
+		return (PAGE_SHIFT - 10) / 2;
+	default:
+		panic("Invalid FTLB configuration with Conf4_mmuextdef=%d value\n",
+		      mmuextdef >> 14);
+	}
+}
+
+#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
+#define HPAGE_SHIFT	(PAGE_SHIFT + PAGE_SHIFT - 3)
+#define HPAGE_SIZE	(_AC(1,UL) << HPAGE_SHIFT)
+#define HPAGE_MASK	(~(HPAGE_SIZE - 1))
+#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
+#else /* !CONFIG_MIPS_HUGE_TLB_SUPPORT */
+#define HPAGE_SHIFT	({BUILD_BUG(); 0; })
+#define HPAGE_SIZE	({BUILD_BUG(); 0; })
+#define HPAGE_MASK	({BUILD_BUG(); 0; })
+#define HUGETLB_PAGE_ORDER	({BUILD_BUG(); 0; })
+#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
+
+#include <linux/pfn.h>
+
+extern void build_clear_page(void);
+extern void build_copy_page(void);
+
+/*
+ * It's normally defined only for FLATMEM config but it's
+ * used in our early mem init code for all memory models.
+ * So always define it.
+ */
+#define ARCH_PFN_OFFSET		PFN_UP(PHYS_OFFSET)
+
+extern void clear_page(void * page);
+extern void copy_page(void * to, void * from);
+
+extern unsigned long shm_align_mask;
+
+static inline unsigned long pages_do_alias(unsigned long addr1,
+	unsigned long addr2)
+{
+	return (addr1 ^ addr2) & shm_align_mask;
+}
+
+struct page;
+
+static inline void clear_user_page(void *addr, unsigned long vaddr,
+	struct page *page)
+{
+	extern void (*flush_data_cache_page)(unsigned long addr);
+
+	clear_page(addr);
+	if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
+		flush_data_cache_page((unsigned long)addr);
+}
+
+struct vm_area_struct;
+extern void copy_user_highpage(struct page *to, struct page *from,
+	unsigned long vaddr, struct vm_area_struct *vma);
+
+#define __HAVE_ARCH_COPY_USER_HIGHPAGE
+
+/*
+ * These are used to make use of C type-checking..
+ */
+#ifdef CONFIG_PHYS_ADDR_T_64BIT
+  #ifdef CONFIG_CPU_MIPS32
+    typedef struct { unsigned long pte_low, pte_high; } pte_t;
+    #define pte_val(x)	  ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
+    #define __pte(x)	  ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
+  #else
+     typedef struct { unsigned long long pte; } pte_t;
+     #define pte_val(x) ((x).pte)
+     #define __pte(x)	((pte_t) { (x) } )
+  #endif
+#else
+typedef struct { unsigned long pte; } pte_t;
+#define pte_val(x)	((x).pte)
+#define __pte(x)	((pte_t) { (x) } )
+#endif
+typedef struct page *pgtable_t;
+
+/*
+ * Right now we don't support 4-level pagetables, so all pud-related
+ * definitions come from <asm-generic/pgtable-nopud.h>.
+ */
+
+/*
+ * Finall the top of the hierarchy, the pgd
+ */
+typedef struct { unsigned long pgd; } pgd_t;
+#define pgd_val(x)	((x).pgd)
+#define __pgd(x)	((pgd_t) { (x) } )
+
+/*
+ * Manipulate page protection bits
+ */
+typedef struct { unsigned long pgprot; } pgprot_t;
+#define pgprot_val(x)	((x).pgprot)
+#define __pgprot(x)	((pgprot_t) { (x) } )
+
+/*
+ * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
+ * pair of pages we only have a single global bit per pair of pages.  When
+ * writing to the TLB make sure we always have the bit set for both pages
+ * or none.  This macro is used to access the `buddy' of the pte we're just
+ * working on.
+ */
+#define ptep_buddy(x)	((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
+
+/*
+ * __pa()/__va() should be used only during mem init.
+ */
+#ifdef CONFIG_64BIT
+#define __pa(x)								\
+({									\
+    unsigned long __x = (unsigned long)(x);				\
+    __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x);			\
+})
+#else
+#define __pa(x)								\
+    ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
+#endif
+#define __va(x)		((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
+#include <asm/io.h>
+
+/*
+ * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad
+ * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org).  The
+ * discussion can be found in lkml posting
+ * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is
+ * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html
+ *
+ * It is unclear if the misscompilations mentioned in
+ * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one
+ * until GCC 3.x has been retired before we can apply
+ * https://patchwork.linux-mips.org/patch/1541/
+ */
+
+#ifndef __pa_symbol
+#define __pa_symbol(x)	__pa(RELOC_HIDE((unsigned long)(x), 0))
+#endif
+
+#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
+
+#ifdef CONFIG_FLATMEM
+
+static inline int pfn_valid(unsigned long pfn)
+{
+	/* avoid <linux/mm.h> include hell */
+	extern unsigned long max_mapnr;
+
+	return pfn >= ARCH_PFN_OFFSET && pfn < max_mapnr;
+}
+
+#elif defined(CONFIG_SPARSEMEM)
+
+/* pfn_valid is defined in linux/mmzone.h */
+
+#elif defined(CONFIG_NEED_MULTIPLE_NODES)
+
+#define pfn_valid(pfn)							\
+({									\
+	unsigned long __pfn = (pfn);					\
+	int __n = pfn_to_nid(__pfn);					\
+	((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +		\
+			       NODE_DATA(__n)->node_spanned_pages)	\
+		    : 0);						\
+})
+
+#endif
+
+#define virt_to_page(kaddr)	pfn_to_page(PFN_DOWN(virt_to_phys((void *)     \
+								  (kaddr))))
+
+extern int __virt_addr_valid(const volatile void *kaddr);
+#define virt_addr_valid(kaddr)						\
+	__virt_addr_valid((const volatile void *) (kaddr))
+
+#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
+				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+
+#define UNCAC_ADDR(addr)	((addr) - PAGE_OFFSET + UNCAC_BASE)
+#define CAC_ADDR(addr)		((addr) - UNCAC_BASE + PAGE_OFFSET)
+
+#include <asm-generic/memory_model.h>
+#include <asm-generic/getorder.h>
+
+#endif /* _ASM_PAGE_H */