patch-2.3.16 linux/include/asm-sh/page.h

• Lines: 105
• Date: Mon Aug 30 18:12:59 1999
• Orig file: v2.3.15/linux/include/asm-sh/page.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.15/linux/include/asm-sh/page.h linux/include/asm-sh/page.h
@@ -0,0 +1,104 @@
+#ifndef __ASM_SH_PAGE_H
+#define __ASM_SH_PAGE_H
+
+/*
+ * Copyright (C) 1999  Niibe Yutaka
+ */
+
+/* XXX 
+   [ P0 (virtual) ]               0x00000000     <------ User space
+   [ P1 (fixed)  write-through]   0x80000000     <------ Kernel space
+   [ P2 (fixed)  non-cachable]    0xA0000000     <------ Physical access
+   [ P3 (virtual) write-back]     0xC0000000     <------ not used
+   [ P4 control   ]               0xE0000000
+ */
+
+#include <linux/config.h>
+
+/* PAGE_SHIFT determines the page size */
+#define PAGE_SHIFT	12
+#define PAGE_SIZE	(1UL << PAGE_SHIFT)
+#define PAGE_MASK	(~(PAGE_SIZE-1))
+
+#ifdef __KERNEL__
+#ifndef __ASSEMBLY__
+
+#define STRICT_MM_TYPECHECKS
+
+#define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
+#define copy_page(to,from)	memcpy((void *)(to), (void *)(from), PAGE_SIZE)
+
+#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;
+typedef struct { unsigned long pgd; } pgd_t;
+typedef struct { unsigned long pgprot; } pgprot_t;
+
+#define pte_val(x)	((x).pte)
+#define pmd_val(x)	((x).pmd)
+#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 __pgd(x)	((pgd_t) { (x) } )
+#define __pgprot(x)	((pgprot_t) { (x) } )
+
+#else
+/*
+ * .. while these make it easier on the compiler
+ */
+typedef unsigned long pte_t;
+typedef unsigned long pmd_t;
+typedef unsigned long pgd_t;
+typedef unsigned long pgprot_t;
+
+#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 __pmd(x)	(x)
+#define __pgd(x)	(x)
+#define __pgprot(x)	(x)
+
+#endif
+#endif /* !__ASSEMBLY__ */
+
+/* to align the pointer to the (next) page boundary */
+#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)
+
+/*
+ * IF YOU CHANGE THIS, PLEASE ALSO CHANGE
+ *
+ *	arch/sh/vmlinux.lds
+ *
+ * which has the same constant encoded..
+ */
+#define __PAGE_OFFSET		(0x80000000)
+
+#define __MEMORY_START		CONFIG_MEMORY_START
+
+#define PAGE_OFFSET		((unsigned long)__PAGE_OFFSET+__MEMORY_START)
+#define __pa(x)			((unsigned long)(x)-__PAGE_OFFSET)
+#define __va(x)			((void *)((unsigned long)(x)+__PAGE_OFFSET))
+#define MAP_NR(addr)		((__pa(addr)-__MEMORY_START) >> PAGE_SHIFT)
+
+#ifndef __ASSEMBLY__
+#define BUG() do { \
+	printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
+	asm volatile("nop"); \
+} while (0)
+
+#define PAGE_BUG(page) do { \
+	BUG(); \
+} while (0)
+#endif
+
+#endif /* __KERNEL__ */
+
+#endif /* __ASM_SH_PAGE_H */