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, 26 insertions, 0 deletions

diff --git a/arch/x86/include/asm/dmi.h b/arch/x86/include/asm/dmi.h
new file mode 100644
index 00000000000..1cff6fe81fa
--- /dev/null
+++ b/arch/x86/include/asm/dmi.h
@@ -0,0 +1,26 @@
+#ifndef ASM_X86__DMI_H
+#define ASM_X86__DMI_H
+
+#include <asm/io.h>
+
+#define DMI_MAX_DATA 2048
+
+extern int dmi_alloc_index;
+extern char dmi_alloc_data[DMI_MAX_DATA];
+
+/* This is so early that there is no good way to allocate dynamic memory.
+   Allocate data in an BSS array. */
+static inline void *dmi_alloc(unsigned len)
+{
+        int idx = dmi_alloc_index;
+        if ((dmi_alloc_index + len) > DMI_MAX_DATA)
+                return NULL;
+        dmi_alloc_index += len;
+        return dmi_alloc_data + idx;
+}
+
+/* Use early IO mappings for DMI because it's initialized early */
+#define dmi_ioremap early_ioremap
+#define dmi_iounmap early_iounmap
+
+#endif /* ASM_X86__DMI_H */