patch-2.3.16 linux/arch/i386/mm/bigmem.c

• Lines: 34
• Date: Thu Aug 26 12:34:55 1999
• Orig file: v2.3.15/linux/arch/i386/mm/bigmem.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.15/linux/arch/i386/mm/bigmem.c linux/arch/i386/mm/bigmem.c
@@ -0,0 +1,33 @@
+/*
+ * BIGMEM IA32 code and variables.
+ *
+ * (C) 1999 Andrea Arcangeli, SuSE GmbH, andrea@suse.de
+ *          Gerhard Wichert, Siemens AG, Gerhard.Wichert@pdb.siemens.de
+ */
+
+#include <linux/mm.h>
+#include <linux/bigmem.h>
+
+unsigned long bigmem_start, bigmem_end;
+
+/* NOTE: fixmap_init alloc all the fixmap pagetables contigous on the
+   physical space so we can cache the place of the first one and move
+   around without checking the pgd every time. */
+pte_t *kmap_pte;
+pgprot_t kmap_prot;
+
+#define kmap_get_fixmap_pte(vaddr)					\
+	pte_offset(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
+
+void __init kmap_init(void)
+{
+	unsigned long kmap_vstart;
+
+	/* cache the first kmap pte */
+	kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
+	kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
+
+	kmap_prot = PAGE_KERNEL;
+	if (boot_cpu_data.x86_capability & X86_FEATURE_PGE)
+		pgprot_val(kmap_prot) |= _PAGE_GLOBAL;
+}