x86: Split pgtable_32.h into pgtable_32.h and pgtable_32_types.h

Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>

1 files changed, 46 insertions, 0 deletions

diff --git a/arch/x86/include/asm/pgtable_32_types.h b/arch/x86/include/asm/pgtable_32_types.h
new file mode 100644
index 00000000000..bd8df3b2fe0
--- /dev/null
+++ b/arch/x86/include/asm/pgtable_32_types.h
@@ -0,0 +1,46 @@
+#ifndef _ASM_X86_PGTABLE_32_DEFS_H
+#define _ASM_X86_PGTABLE_32_DEFS_H
+
+/*
+ * The Linux x86 paging architecture is 'compile-time dual-mode', it
+ * implements both the traditional 2-level x86 page tables and the
+ * newer 3-level PAE-mode page tables.
+ */
+#ifdef CONFIG_X86_PAE
+# include <asm/pgtable-3level_types.h>
+# define PMD_SIZE       (1UL << PMD_SHIFT)
+# define PMD_MASK       (~(PMD_SIZE - 1))
+#else
+# include <asm/pgtable-2level_types.h>
+#endif
+
+#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
+#define PGDIR_MASK      (~(PGDIR_SIZE - 1))
+
+/* Just any arbitrary offset to the start of the vmalloc VM area: the
+ * current 8MB value just means that there will be a 8MB "hole" after the
+ * physical memory until the kernel virtual memory starts.  That means that
+ * any out-of-bounds memory accesses will hopefully be caught.
+ * The vmalloc() routines leaves a hole of 4kB between each vmalloced
+ * area for the same reason. ;)
+ */
+#define VMALLOC_OFFSET  (8 * 1024 * 1024)
+#define VMALLOC_START   ((unsigned long)high_memory + VMALLOC_OFFSET)
+#ifdef CONFIG_X86_PAE
+#define LAST_PKMAP 512
+#else
+#define LAST_PKMAP 1024
+#endif
+
+#define PKMAP_BASE ((FIXADDR_BOOT_START - PAGE_SIZE * (LAST_PKMAP + 1)) \
+                    & PMD_MASK)
+
+#ifdef CONFIG_HIGHMEM
+# define VMALLOC_END    (PKMAP_BASE - 2 * PAGE_SIZE)
+#else
+# define VMALLOC_END    (FIXADDR_START - 2 * PAGE_SIZE)
+#endif
+
+#define MAXMEM  (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE)
+
+#endif /* _ASM_X86_PGTABLE_32_DEFS_H */