x86, um: ... and asm-x86 move

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/arch/x86/include/asm/sparsemem.h b/arch/x86/include/asm/sparsemem.h
new file mode 100644
index 000000000000..38f8e6bc3186
--- /dev/null
+++ b/arch/x86/include/asm/sparsemem.h
@@ -0,0 +1,34 @@
+#ifndef ASM_X86__SPARSEMEM_H
+#define ASM_X86__SPARSEMEM_H
+
+#ifdef CONFIG_SPARSEMEM
+/*
+ * generic non-linear memory support:
+ *
+ * 1) we will not split memory into more chunks than will fit into the flags
+ *    field of the struct page
+ *
+ * SECTION_SIZE_BITS            2^n: size of each section
+ * MAX_PHYSADDR_BITS            2^n: max size of physical address space
+ * MAX_PHYSMEM_BITS             2^n: how much memory we can have in that space
+ *
+ */
+
+#ifdef CONFIG_X86_32
+# ifdef CONFIG_X86_PAE
+#  define SECTION_SIZE_BITS     29
+#  define MAX_PHYSADDR_BITS     36
+#  define MAX_PHYSMEM_BITS      36
+# else
+#  define SECTION_SIZE_BITS     26
+#  define MAX_PHYSADDR_BITS     32
+#  define MAX_PHYSMEM_BITS      32
+# endif
+#else /* CONFIG_X86_32 */
+# define SECTION_SIZE_BITS      27 /* matt - 128 is convenient right now */
+# define MAX_PHYSADDR_BITS      44
+# define MAX_PHYSMEM_BITS       44
+#endif
+
+#endif /* CONFIG_SPARSEMEM */
+#endif /* ASM_X86__SPARSEMEM_H */