[PATCH v2] x86: give names to realmode wakeup flags

[PATCH v2] x86: give names to realmode wakeup flags

[Kees Cook]

Instead of using literals, use a common set of names for the
user-controlled realmode wakeup flags.

Signed-off-by: Kees Cook <kees.cook@canonical.com>
---
v2: split from the MISC_ENABLE restoration patch

 arch/x86/kernel/acpi/realmode/wakemain.c |    6 +++---
 arch/x86/kernel/acpi/realmode/wakeup.h   |    4 ++++
 arch/x86/kernel/acpi/sleep.c             |    6 +++---
 3 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/acpi/realmode/wakemain.c b/arch/x86/kernel/acpi/realmode/wakemain.c
index 883962d..1749cde 100644
--- a/arch/x86/kernel/acpi/realmode/wakemain.c
+++ b/arch/x86/kernel/acpi/realmode/wakemain.c
@@ -67,13 +67,13 @@ void main(void)
 	if (wakeup_header.real_magic != 0x12345678)
 		while (1);
 
-	if (wakeup_header.realmode_flags & 4)
+	if (wakeup_header.realmode_flags & WAKE_FLAG_BEEP)
 		send_morse("...-");
 
-	if (wakeup_header.realmode_flags & 1)
+	if (wakeup_header.realmode_flags & WAKE_FLAG_BIOS)
 		asm volatile("lcallw   $0xc000,$3");
 
-	if (wakeup_header.realmode_flags & 2) {
+	if (wakeup_header.realmode_flags & WAKE_FLAG_MODE) {
 		/* Need to call BIOS */
 		probe_cards(0);
 		set_mode(wakeup_header.video_mode);
diff --git a/arch/x86/kernel/acpi/realmode/wakeup.h b/arch/x86/kernel/acpi/realmode/wakeup.h
index 97a29e1..516c885 100644
--- a/arch/x86/kernel/acpi/realmode/wakeup.h
+++ b/arch/x86/kernel/acpi/realmode/wakeup.h
@@ -38,6 +38,10 @@ struct wakeup_header {
 extern struct wakeup_header wakeup_header;
 #endif
 
+#define WAKEUP_FLAG_BIOS        1
+#define WAKEUP_FLAG_MODE        2
+#define WAKEUP_FLAG_BEEP        4
+
 #define WAKEUP_HEADER_OFFSET	8
 #define WAKEUP_HEADER_SIGNATURE 0x51ee1111
 #define WAKEUP_END_SIGNATURE	0x65a22c82
diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index 103b6ab..12115a9 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -110,11 +110,11 @@ static int __init acpi_sleep_setup(char *str)
 {
 	while ((str != NULL) && (*str != '\0')) {
 		if (strncmp(str, "s3_bios", 7) == 0)
-			acpi_realmode_flags |= 1;
+			acpi_realmode_flags |= WAKEUP_FLAG_BIOS;
 		if (strncmp(str, "s3_mode", 7) == 0)
-			acpi_realmode_flags |= 2;
+			acpi_realmode_flags |= WAKEUP_FLAG_MODE;
 		if (strncmp(str, "s3_beep", 7) == 0)
-			acpi_realmode_flags |= 4;
+			acpi_realmode_flags |= WAKEUP_FLAG_BEEP;
 #ifdef CONFIG_HIBERNATION
 		if (strncmp(str, "s4_nohwsig", 10) == 0)
 			acpi_no_s4_hw_signature();
-- 
1.7.4.1

-- 
Kees Cook
Ubuntu Security Team