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authorNigel Cunningham <nigel@nigel.suspend2.net>2007-07-19 01:47:41 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 10:04:43 -0700
commit5a60d6235c8352ade8f2699e72fcdfe853730456 (patch)
treecafab638df562b912e9e2a653e5c7238816d9706 /arch/x86_64
parentbd804eba1c8597cbb7cd5a5f9fe886aae16a079a (diff)
downloadlinux-2.6.34-ux500-5a60d6235c8352ade8f2699e72fcdfe853730456.tar.gz
PM: Optional beeping during resume from suspend to RAM
Add a feature allowing the user to make the system beep during a resume from suspend to RAM, on x86_64 and i386. This is useful for the users with broken resume from RAM, so that they can verify if the control reaches the kernel after a wake-up event. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/kernel/acpi/wakeup.S25
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/acpi/wakeup.S b/arch/x86_64/kernel/acpi/wakeup.S
index 8550a6ffa27..ed63d184579 100644
--- a/arch/x86_64/kernel/acpi/wakeup.S
+++ b/arch/x86_64/kernel/acpi/wakeup.S
@@ -16,6 +16,21 @@
# cs = 0x1234, eip = 0x05
#
+#define BEEP \
+ inb $97, %al; \
+ outb %al, $0x80; \
+ movb $3, %al; \
+ outb %al, $97; \
+ outb %al, $0x80; \
+ movb $-74, %al; \
+ outb %al, $67; \
+ outb %al, $0x80; \
+ movb $-119, %al; \
+ outb %al, $66; \
+ outb %al, $0x80; \
+ movb $15, %al; \
+ outb %al, $66;
+
ALIGN
.align 16
@@ -33,6 +48,13 @@ wakeup_code:
movw %cs, %ax
movw %ax, %ds # Make ds:0 point to wakeup_start
movw %ax, %ss
+
+ # Data segment must be set up before we can see whether to beep.
+ testl $1, beep_flags - wakeup_code
+ jz 1f
+ BEEP
+1:
+
# Private stack is needed for ASUS board
mov $(wakeup_stack - wakeup_code), %sp
@@ -229,6 +251,7 @@ gdt_48a:
.long gdta - wakeup_code # gdt base (relocated in later)
real_magic: .quad 0
+beep_flags: .quad 0
video_mode: .quad 0
video_flags: .quad 0
@@ -344,6 +367,8 @@ ENTRY(acpi_copy_wakeup_routine)
pushq %rax
pushq %rdx
+ movl s2ram_beep, %edx
+ movl %edx, beep_flags - wakeup_start (,%rdi)
movl saved_video_mode, %edx
movl %edx, video_mode - wakeup_start (,%rdi)
movl acpi_video_flags, %edx