[PATCH 3/4] x86, efi: Add an efi= kernel command line parameter

[Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>]

From: Borislav Petkov <bp-l3A5Bk7waGM@public.gmane.org>

.. for passing miscellaneous options from the kernel command line.

Signed-off-by: Borislav Petkov <bp-l3A5Bk7waGM@public.gmane.org>
---
 arch/x86/platform/efi/efi.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 82089d8b1954..aea4337f7023 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -88,6 +88,11 @@ static u64 active_size;
 
 unsigned long x86_efi_facility;
 
+ /* 1:1 mapping of services regions */
+#define EFI_CFG_MAP11	BIT(0)
+
+static unsigned long efi_config;
+
 /*
  * Returns 1 if 'facility' is enabled, 0 otherwise.
  */
@@ -1167,3 +1172,14 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size)
 	return EFI_SUCCESS;
 }
 EXPORT_SYMBOL_GPL(efi_query_variable_store);
+
+static int __init parse_efi_cmdline(char *str)
+{
+	if (*str == '=')
+		str++;
+	if (!strncmp(str, "1:1_map", 7))
+		efi_config |= EFI_CFG_MAP11;
+
+	return 0;
+}
+early_param("efi", parse_efi_cmdline);
-- 
1.8.3.rc1.25.g423ecb0