bitkeeper revision 1.71 (3e53dbfc_URK_oQbGAQZ3O3Qfr6z-Q)

missing file for Keir's virtual block device checkin

2 files changed, 92 insertions, 0 deletions

diff --git a/.rootkeys b/.rootkeys
index 98a3bb18a8..07a5d73368 100644
--- a/.rootkeys
+++ b/.rootkeys
@@ -348,6 +348,7 @@
 3ddb79bac26NkKcPIEsfxETc5Snyag xenolinux-2.4.16-sparse/include/asm-xeno/elf.h
 3ddb79ba722pCJ_g_xI8ebsE31IK-Q xenolinux-2.4.16-sparse/include/asm-xeno/errno.h
 3ddb79b8vIpUpgaSNEneFkg5hYSvNg xenolinux-2.4.16-sparse/include/asm-xeno/fcntl.h
+3e53dbfb9mmyM-y5NuBBTDJvQkDzjA xenolinux-2.4.16-sparse/include/asm-xeno/fixmap.h
 3ddb79b8780YvqvK1g5KPIWzQ6P15w xenolinux-2.4.16-sparse/include/asm-xeno/floppy.h
 3ddb79bas-nFywnmilbUeT34PEAA0g xenolinux-2.4.16-sparse/include/asm-xeno/hardirq.h
 3ddb79batzR40ZFY9dvgs5f1aM9I6g xenolinux-2.4.16-sparse/include/asm-xeno/hdreg.h
diff --git a/xenolinux-2.4.16-sparse/include/asm-xeno/fixmap.h b/xenolinux-2.4.16-sparse/include/asm-xeno/fixmap.h
new file mode 100644
index 0000000000..d9a10f2e39
--- /dev/null
+++ b/xenolinux-2.4.16-sparse/include/asm-xeno/fixmap.h
@@ -0,0 +1,91 @@
+/*
+ * fixmap.h: compile-time virtual memory allocation
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1998 Ingo Molnar
+ *
+ * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
+ */
+
+#ifndef _ASM_FIXMAP_H
+#define _ASM_FIXMAP_H
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <asm/apicdef.h>
+#include <asm/page.h>
+
+/*
+ * Here we define all the compile-time 'special' virtual
+ * addresses. The point is to have a constant address at
+ * compile time, but to set the physical address only
+ * in the boot process. We allocate these special  addresses
+ * from the end of virtual memory (0xfffff000) backwards.
+ * Also this lets us do fail-safe vmalloc(), we
+ * can guarantee that these special addresses and
+ * vmalloc()-ed addresses never overlap.
+ *
+ * these 'compile-time allocated' memory buffers are
+ * fixed-size 4k pages. (or larger if used with an increment
+ * highger than 1) use fixmap_set(idx,phys) to associate
+ * physical memory with fixmap indices.
+ *
+ * TLB entries of such buffers will not be flushed across
+ * task switches.
+ */
+enum fixed_addresses {
+    FIX_BLKRING_BASE,
+    __end_of_fixed_addresses
+};
+
+extern void __set_fixmap (enum fixed_addresses idx,
+					unsigned long phys, pgprot_t flags);
+
+#define set_fixmap(idx, phys) \
+		__set_fixmap(idx, phys, PAGE_KERNEL)
+/*
+ * Some hardware wants to get fixmapped without caching.
+ */
+#define set_fixmap_nocache(idx, phys) \
+		__set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
+/*
+ * used by vmalloc.c.
+ *
+ * Leave one empty page between vmalloc'ed areas and
+ * the start of the fixmap, and leave one page empty
+ * at the top of mem..
+ */
+#define FIXADDR_TOP	(HYPERVISOR_VIRT_START - 2*PAGE_SIZE)
+#define __FIXADDR_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)
+#define FIXADDR_START	(FIXADDR_TOP - __FIXADDR_SIZE)
+
+#define __fix_to_virt(x)	(FIXADDR_TOP - ((x) << PAGE_SHIFT))
+
+extern void __this_fixmap_does_not_exist(void);
+
+/*
+ * 'index to address' translation. If anyone tries to use the idx
+ * directly without tranlation, we catch the bug with a NULL-deference
+ * kernel oops. Illegal ranges of incoming indices are caught too.
+ */
+static inline unsigned long fix_to_virt(const unsigned int idx)
+{
+	/*
+	 * this branch gets completely eliminated after inlining,
+	 * except when someone tries to use fixaddr indices in an
+	 * illegal way. (such as mixing up address types or using
+	 * out-of-range indices).
+	 *
+	 * If it doesn't get removed, the linker will complain
+	 * loudly with a reasonably clear error message..
+	 */
+	if (idx >= __end_of_fixed_addresses)
+		__this_fixmap_does_not_exist();
+
+        return __fix_to_virt(idx);
+}
+
+#endif