From 1513ff9b7899ab588401c89db0e99903dbf5f886 Mon Sep 17 00:00:00 2001
From: Ralf Baechle <ralf@linux-mips.org>
Date: Mon, 28 Nov 1994 11:59:19 +0000
Subject: Import of Linus's Linux 1.1.68

---
 include/asm-alpha/page.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 include/asm-alpha/page.h

(limited to 'include/asm-alpha/page.h')

diff --git a/include/asm-alpha/page.h b/include/asm-alpha/page.h
new file mode 100644
index 000000000..6a09532f9
--- /dev/null
+++ b/include/asm-alpha/page.h
@@ -0,0 +1,50 @@
+#ifndef _ALPHA_PAGE_H
+#define _ALPHA_PAGE_H
+
+#define invalidate_all() \
+__asm__ __volatile__( \
+	"lda $16,-2($31)\n\t" \
+	".long 51" \
+	: : :"$1", "$16", "$17", "$22","$23","$24","$25")
+
+#define invalidate() \
+__asm__ __volatile__( \
+	"lda $16,-1($31)\n\t" \
+	".long 51" \
+	: : :"$1", "$16", "$17", "$22","$23","$24","$25")
+
+			/* PAGE_SHIFT determines the page size */
+#define PAGE_SHIFT			13
+#define PGDIR_SHIFT			23
+#define PAGE_SIZE			(1UL << PAGE_SHIFT)
+#define PGDIR_SIZE			(1UL << PGDIR_SHIFT)
+
+#ifdef __KERNEL__
+
+			/* number of bits that fit into a memory pointer */
+#define BITS_PER_PTR			(8*sizeof(unsigned long))
+			/* to mask away the intra-page address bits */
+#define PAGE_MASK			(~(PAGE_SIZE-1))
+			/* to mask away the intra-page address bits */
+#define PGDIR_MASK			(~(PGDIR_SIZE-1))
+			/* to align the pointer to the (next) page boundary */
+#define PAGE_ALIGN(addr)		(((addr)+PAGE_SIZE-1)&PAGE_MASK)
+			/* to align the pointer to a pointer address */
+#define PTR_MASK			(~(sizeof(void*)-1))
+
+					/* sizeof(void*)==1<<SIZEOF_PTR_LOG2 */
+					/* 64-bit machines, beware!  SRB. */
+#define SIZEOF_PTR_LOG2			4
+
+			/* to find an entry in a page-table-directory */
+#define PAGE_DIR_OFFSET(base,address)	((unsigned long*)((base)+\
+  ((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)*2&PTR_MASK&~PAGE_MASK)))
+			/* to find an entry in a page-table */
+#define PAGE_PTR(address)		\
+  ((unsigned long)(address)>>(PAGE_SHIFT-SIZEOF_PTR_LOG2)&PTR_MASK&~PAGE_MASK)
+			/* the no. of pointers that fit on a page */
+#define PTRS_PER_PAGE			(PAGE_SIZE/sizeof(void*))
+
+#endif /* __KERNEL__ */
+
+#endif /* _ALPHA_PAGE_H */
-- 
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