From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/ia64/include/asm/page.h | 236 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 236 insertions(+)
 create mode 100644 arch/ia64/include/asm/page.h

(limited to 'arch/ia64/include/asm/page.h')

diff --git a/arch/ia64/include/asm/page.h b/arch/ia64/include/asm/page.h
new file mode 100644
index 000000000..ec48bb9f9
--- /dev/null
+++ b/arch/ia64/include/asm/page.h
@@ -0,0 +1,236 @@
+#ifndef _ASM_IA64_PAGE_H
+#define _ASM_IA64_PAGE_H
+/*
+ * Pagetable related stuff.
+ *
+ * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+
+#include <asm/intrinsics.h>
+#include <asm/types.h>
+
+/*
+ * The top three bits of an IA64 address are its Region Number.
+ * Different regions are assigned to different purposes.
+ */
+#define RGN_SHIFT	(61)
+#define RGN_BASE(r)	(__IA64_UL_CONST(r)<<RGN_SHIFT)
+#define RGN_BITS	(RGN_BASE(-1))
+
+#define RGN_KERNEL	7	/* Identity mapped region */
+#define RGN_UNCACHED    6	/* Identity mapped I/O region */
+#define RGN_GATE	5	/* Gate page, Kernel text, etc */
+#define RGN_HPAGE	4	/* For Huge TLB pages */
+
+/*
+ * PAGE_SHIFT determines the actual kernel page size.
+ */
+#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
+# define PAGE_SHIFT	12
+#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
+# define PAGE_SHIFT	13
+#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
+# define PAGE_SHIFT	14
+#elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
+# define PAGE_SHIFT	16
+#else
+# error Unsupported page size!
+#endif
+
+#define PAGE_SIZE		(__IA64_UL_CONST(1) << PAGE_SHIFT)
+#define PAGE_MASK		(~(PAGE_SIZE - 1))
+
+#define PERCPU_PAGE_SHIFT	18	/* log2() of max. size of per-CPU area */
+#define PERCPU_PAGE_SIZE	(__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
+
+
+#ifdef CONFIG_HUGETLB_PAGE
+# define HPAGE_REGION_BASE	RGN_BASE(RGN_HPAGE)
+# define HPAGE_SHIFT		hpage_shift
+# define HPAGE_SHIFT_DEFAULT	28	/* check ia64 SDM for architecture supported size */
+# define HPAGE_SIZE		(__IA64_UL_CONST(1) << HPAGE_SHIFT)
+# define HPAGE_MASK		(~(HPAGE_SIZE - 1))
+
+# define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
+#endif /* CONFIG_HUGETLB_PAGE */
+
+#ifdef __ASSEMBLY__
+# define __pa(x)		((x) - PAGE_OFFSET)
+# define __va(x)		((x) + PAGE_OFFSET)
+#else /* !__ASSEMBLY */
+#  define STRICT_MM_TYPECHECKS
+
+extern void clear_page (void *page);
+extern void copy_page (void *to, void *from);
+
+/*
+ * clear_user_page() and copy_user_page() can't be inline functions because
+ * flush_dcache_page() can't be defined until later...
+ */
+#define clear_user_page(addr, vaddr, page)	\
+do {						\
+	clear_page(addr);			\
+	flush_dcache_page(page);		\
+} while (0)
+
+#define copy_user_page(to, from, vaddr, page)	\
+do {						\
+	copy_page((to), (from));		\
+	flush_dcache_page(page);		\
+} while (0)
+
+
+#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr)		\
+({									\
+	struct page *page = alloc_page_vma(				\
+		GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr);	\
+	if (page)							\
+ 		flush_dcache_page(page);				\
+	page;								\
+})
+
+#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
+
+#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
+
+#ifdef CONFIG_VIRTUAL_MEM_MAP
+extern int ia64_pfn_valid (unsigned long pfn);
+#else
+# define ia64_pfn_valid(pfn) 1
+#endif
+
+#ifdef CONFIG_VIRTUAL_MEM_MAP
+extern struct page *vmem_map;
+#ifdef CONFIG_DISCONTIGMEM
+# define page_to_pfn(page)	((unsigned long) (page - vmem_map))
+# define pfn_to_page(pfn)	(vmem_map + (pfn))
+#else
+# include <asm-generic/memory_model.h>
+#endif
+#else
+# include <asm-generic/memory_model.h>
+#endif
+
+#ifdef CONFIG_FLATMEM
+# define pfn_valid(pfn)		(((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
+#elif defined(CONFIG_DISCONTIGMEM)
+extern unsigned long min_low_pfn;
+extern unsigned long max_low_pfn;
+# define pfn_valid(pfn)		(((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
+#endif
+
+#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
+#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
+#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
+
+typedef union ia64_va {
+	struct {
+		unsigned long off : 61;		/* intra-region offset */
+		unsigned long reg :  3;		/* region number */
+	} f;
+	unsigned long l;
+	void *p;
+} ia64_va;
+
+/*
+ * Note: These macros depend on the fact that PAGE_OFFSET has all
+ * region bits set to 1 and all other bits set to zero.  They are
+ * expressed in this way to ensure they result in a single "dep"
+ * instruction.
+ */
+#define __pa(x)		({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
+#define __va(x)		({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
+
+#define REGION_NUMBER(x)	({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
+#define REGION_OFFSET(x)	({ia64_va _v; _v.l = (long) (x); _v.f.off;})
+
+#ifdef CONFIG_HUGETLB_PAGE
+# define htlbpage_to_page(x)	(((unsigned long) REGION_NUMBER(x) << 61)			\
+				 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
+# define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
+extern unsigned int hpage_shift;
+#endif
+
+static __inline__ int
+get_order (unsigned long size)
+{
+	long double d = size - 1;
+	long order;
+
+	order = ia64_getf_exp(d);
+	order = order - PAGE_SHIFT - 0xffff + 1;
+	if (order < 0)
+		order = 0;
+	return order;
+}
+
+#endif /* !__ASSEMBLY__ */
+
+#ifdef STRICT_MM_TYPECHECKS
+  /*
+   * These are used to make use of C type-checking..
+   */
+  typedef struct { unsigned long pte; } pte_t;
+  typedef struct { unsigned long pmd; } pmd_t;
+#if CONFIG_PGTABLE_LEVELS == 4
+  typedef struct { unsigned long pud; } pud_t;
+#endif
+  typedef struct { unsigned long pgd; } pgd_t;
+  typedef struct { unsigned long pgprot; } pgprot_t;
+  typedef struct page *pgtable_t;
+
+# define pte_val(x)	((x).pte)
+# define pmd_val(x)	((x).pmd)
+#if CONFIG_PGTABLE_LEVELS == 4
+# define pud_val(x)	((x).pud)
+#endif
+# define pgd_val(x)	((x).pgd)
+# define pgprot_val(x)	((x).pgprot)
+
+# define __pte(x)	((pte_t) { (x) } )
+# define __pmd(x)	((pmd_t) { (x) } )
+# define __pgprot(x)	((pgprot_t) { (x) } )
+
+#else /* !STRICT_MM_TYPECHECKS */
+  /*
+   * .. while these make it easier on the compiler
+   */
+# ifndef __ASSEMBLY__
+    typedef unsigned long pte_t;
+    typedef unsigned long pmd_t;
+    typedef unsigned long pgd_t;
+    typedef unsigned long pgprot_t;
+    typedef struct page *pgtable_t;
+# endif
+
+# define pte_val(x)	(x)
+# define pmd_val(x)	(x)
+# define pgd_val(x)	(x)
+# define pgprot_val(x)	(x)
+
+# define __pte(x)	(x)
+# define __pgd(x)	(x)
+# define __pgprot(x)	(x)
+#endif /* !STRICT_MM_TYPECHECKS */
+
+#define PAGE_OFFSET			RGN_BASE(RGN_KERNEL)
+
+#define VM_DATA_DEFAULT_FLAGS		(VM_READ | VM_WRITE |					\
+					 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |		\
+					 (((current->personality & READ_IMPLIES_EXEC) != 0)	\
+					  ? VM_EXEC : 0))
+
+#define GATE_ADDR		RGN_BASE(RGN_GATE)
+
+/*
+ * 0xa000000000000000+2*PERCPU_PAGE_SIZE
+ * - 0xa000000000000000+3*PERCPU_PAGE_SIZE remain unmapped (guard page)
+ */
+#define KERNEL_START		 (GATE_ADDR+__IA64_UL_CONST(0x100000000))
+#define PERCPU_ADDR		(-PERCPU_PAGE_SIZE)
+#define LOAD_OFFSET		(KERNEL_START - KERNEL_TR_PAGE_SIZE)
+
+#define __HAVE_ARCH_GATE_AREA	1
+
+#endif /* _ASM_IA64_PAGE_H */
-- 
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