arm64: dmi: Add SMBIOS/DMI support

SMbios is important for server hardware vendors. It implements a spec for
providing descriptive information about the platform. Things like serial
numbers, physical layout of the ports, build configuration data, and the like.

This has been tested by dmidecode and lshw tools.

Signed-off-by: Yi Li <yi.li@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/dmi.h b/arch/arm64/include/asm/dmi.h
new file mode 100644
index 000000000000..b0882a8620e1
--- /dev/null
+++ b/arch/arm64/include/asm/dmi.h
@@ -0,0 +1,41 @@
+/*
+ * arch/arm64/include/asm/dmi.h
+ *
+ * Copyright (C) 2013 Linaro Limited.
+ * Written by: Yi Li (yi.li@linaro.org)
+ *
+ * based on arch/ia64/include/asm/dmi.h
+ *
+ * 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.
+ */
+
+#ifndef __ASM_DMI_H
+#define __ASM_DMI_H
+
+#include <linux/slab.h>
+#include <linux/efi.h>
+
+static inline void __iomem *dmi_remap(u64 phys, u64 size)
+{
+	void __iomem *p = efi_lookup_mapped_addr(phys);
+
+	/*
+	 * If the mapping spans multiple pages, do a minimal check to ensure
+	 * that the mapping returned by efi_lookup_mapped_addr() covers the
+	 * whole requested range (but ignore potential holes)
+	 */
+	if ((phys & ~PAGE_MASK) + size > PAGE_SIZE
+	    && (p + size - 1) != efi_lookup_mapped_addr(phys + size - 1))
+		return NULL;
+	return p;
+}
+
+/* Reuse existing UEFI mappings for DMI */
+#define dmi_alloc(l)			kzalloc(l, GFP_KERNEL)
+#define dmi_early_remap(x, l)		dmi_remap(x, l)
+#define dmi_early_unmap(x, l)
+#define dmi_unmap(x)
+
+#endif