patch-2.4.2 linux/include/asm-cris/page.h

• Lines: 119
• Date: Tue Feb 13 14:13:44 2001
• Orig file: v2.4.1/linux/include/asm-cris/page.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.1/linux/include/asm-cris/page.h linux/include/asm-cris/page.h
@@ -0,0 +1,118 @@
+#ifndef _CRIS_PAGE_H
+#define _CRIS_PAGE_H
+
+#include <linux/config.h>
+#include <asm/mmu.h>
+
+/* PAGE_SHIFT determines the page size */
+#define PAGE_SHIFT	13
+#define PAGE_SIZE	(1UL << PAGE_SHIFT)
+#define PAGE_MASK	(~(PAGE_SIZE-1))
+
+#ifdef __KERNEL__
+
+#define clear_page(page)        memset((void *)(page), 0, PAGE_SIZE)
+#define copy_page(to,from)      memcpy((void *)(to), (void *)(from), PAGE_SIZE)
+
+#define clear_user_page(page, vaddr)    clear_page(page)
+#define copy_user_page(to, from, vaddr) copy_page(to, from)
+
+#define STRICT_MM_TYPECHECKS
+
+#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
+
+/* to align the pointer to the (next) page boundary */
+#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)
+
+/* This handles the memory map.. */
+
+#ifdef CONFIG_CRIS_LOW_MAP
+#define PAGE_OFFSET		KSEG_6   /* kseg_6 is mapped to physical ram */
+#else
+#define PAGE_OFFSET		KSEG_C   /* kseg_c is mapped to physical ram */
+#endif
+
+#ifndef __ASSEMBLY__
+
+#define BUG() do { \
+  printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
+} while (0)
+
+#define PAGE_BUG(page) do { \
+         BUG(); \
+} while (0)
+
+#endif /* __ASSEMBLY__ */
+
+/* macros to convert between really physical and virtual addresses
+ * by stripping a selected bit, we can convert between KSEG_x and 0x40000000 where
+ * the DRAM really resides
+ */
+
+#ifdef CONFIG_CRIS_LOW_MAP
+/* we have DRAM virtually at 0x6 */
+#define __pa(x)                 ((unsigned long)(x) & 0xdfffffff)
+#define __va(x)                 ((void *)((unsigned long)(x) | 0x20000000))
+#else
+/* we have DRAM virtually at 0xc */
+#define __pa(x)                 ((unsigned long)(x) & 0x7fffffff)
+#define __va(x)                 ((void *)((unsigned long)(x) | 0x80000000))
+#endif
+
+/* to index into the page map. our pages all start at physical addr PAGE_OFFSET so
+ * we can let the map start there. notice that we subtract PAGE_OFFSET because
+ * we start our mem_map there - in other ports they map mem_map physically and
+ * use __pa instead. in our system both the physical and virtual address of DRAM
+ * is too high to let mem_map start at 0, so we do it this way instead (similar
+ * to arm and m68k I think)
+ */ 
+
+#define virt_to_page(kaddr)    (mem_map + (((unsigned long)kaddr - PAGE_OFFSET) >> PAGE_SHIFT))
+#define VALID_PAGE(page)       ((page - mem_map) < max_mapnr)
+
+/* from linker script */
+
+extern unsigned long dram_start, dram_end;
+
+#endif /* __KERNEL__ */
+
+#endif /* _CRIS_PAGE_H */
+