patch-2.4.2 linux/include/asm-s390x/page.h

• Lines: 95
• Date: Tue Feb 13 14:13:44 2001
• Orig file: v2.4.1/linux/include/asm-s390x/page.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.1/linux/include/asm-s390x/page.h linux/include/asm-s390x/page.h
@@ -0,0 +1,94 @@
+/*
+ *  include/asm-s390/page.h
+ *
+ *  S390 version
+ *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Hartmut Penner (hpenner@de.ibm.com)
+ */
+
+#ifndef _S390_PAGE_H
+#define _S390_PAGE_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__
+
+/*
+ * gcc uses builtin, i.e. MVCLE for both operations
+ */
+
+#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 BUG() do { \
+        printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
+        __asm__ __volatile__(".long 0"); \
+} while (0)                                       
+
+#define PAGE_BUG(page) do { \
+        BUG(); \
+} while (0)                      
+
+/* Pure 2^n version of get_order */
+extern __inline__ int get_order(unsigned long size)
+{
+        int order;
+
+        size = (size-1) >> (PAGE_SHIFT-1);
+        order = -1;
+        do {
+                size >>= 1;
+                order++;
+        } while (size);
+        return order;
+}
+
+/*
+ * These are used to make use of C type-checking..
+ */
+typedef struct { unsigned long pte; } pte_t;
+typedef struct { 
+        unsigned long pmd0;
+        unsigned long pmd1; 
+        } 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).pmd0)
+#define pmd_val1(x)     ((x).pmd1)
+#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) } )
+
+#endif                                 /* !__ASSEMBLY__                    */
+
+/* to align the pointer to the (next) page boundary */
+#define PAGE_ALIGN(addr)        (((addr)+PAGE_SIZE-1)&PAGE_MASK)
+
+/*
+ *
+ *
+ */
+
+#define __PAGE_OFFSET           0x0UL
+#define PAGE_OFFSET             0x0UL
+#define __pa(x)                 (unsigned long)(x)
+#define __va(x)                 (void *)(x)
+#define virt_to_page(kaddr)	(mem_map + (__pa(kaddr) >> PAGE_SHIFT))
+#define VALID_PAGE(page)	((page - mem_map) < max_mapnr)
+
+#endif                                 /* __KERNEL__                       */
+
+#endif                                 /* _S390_PAGE_H                     */