patch-2.3.50 linux/include/asm-sh/highmem.h

• Lines: 86
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.49/linux/include/asm-sh/highmem.h
• Orig date: Wed Oct 27 16:34:12 1999

diff -u --recursive --new-file v2.3.49/linux/include/asm-sh/highmem.h linux/include/asm-sh/highmem.h
@@ -1,85 +0,0 @@
-/*
- * highmem.h: virtual kernel memory mappings for high memory
- *
- * Used in CONFIG_HIGHMEM systems for memory pages which
- * are not addressable by direct kernel virtual adresses.
- *
- * Copyright (C) 1999 Gerhard Wichert, Siemens AG
- *		      Gerhard.Wichert@pdb.siemens.de
- *
- *
- * Redesigned the x86 32-bit VM architecture to deal with 
- * up to 16 Terrabyte physical memory. With current x86 CPUs
- * we now support up to 64 Gigabytes physical RAM.
- *
- * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
- */
-
-#ifndef _ASM_HIGHMEM_H
-#define _ASM_HIGHMEM_H
-
-#include <linux/init.h>
-
-/* undef for production */
-#define HIGHMEM_DEBUG 1
-
-/* declarations for highmem.c */
-extern unsigned long highstart_pfn, highend_pfn;
-
-extern pte_t *kmap_pte;
-extern pgprot_t kmap_prot;
-
-extern void kmap_init(void) __init;
-
-/* kmap helper functions necessary to access the highmem pages in kernel */
-#include <asm/pgtable.h>
-#include <asm/kmap_types.h>
-
-extern inline unsigned long kmap(struct page *page, enum km_type type)
-{
-	if (page < highmem_start_page)
-		return page_address(page);
-	{
-		enum fixed_addresses idx = type+KM_TYPE_NR*smp_processor_id();
-		unsigned long vaddr = __fix_to_virt(FIX_KMAP_BEGIN+idx);
-
-#if HIGHMEM_DEBUG
-		if (!pte_none(*(kmap_pte-idx)))
-		{
-			__label__ here;
-		here:
-			printk(KERN_ERR "not null pte on CPU %d from %p\n",
-			       smp_processor_id(), &&here);
-		}
-#endif
-		set_pte(kmap_pte-idx, mk_pte(page, kmap_prot));
-		__flush_tlb_one(vaddr);
-
-		return vaddr;
-	}
-}
-
-extern inline void kunmap(unsigned long vaddr, enum km_type type)
-{
-#if HIGHMEM_DEBUG
-	enum fixed_addresses idx = type+KM_TYPE_NR*smp_processor_id();
-	if ((vaddr & PAGE_MASK) == __fix_to_virt(FIX_KMAP_BEGIN+idx))
-	{
-		/* force other mappings to Oops if they'll try to access
-		   this pte without first remap it */
-		pte_clear(kmap_pte-idx);
-		__flush_tlb_one(vaddr);
-	}
-#endif
-}
-
-extern inline void kmap_check(void)
-{
-#if HIGHMEM_DEBUG
-	int idx_base = KM_TYPE_NR*smp_processor_id(), i;
-	for (i = idx_base; i < idx_base+KM_TYPE_NR; i++)
-		if (!pte_none(*(kmap_pte-i)))
-			BUG();
-#endif
-}
-#endif /* _ASM_HIGHMEM_H */