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>
diff --git a/arch/i386/kernel/acpi/wakeup.S b/arch/i386/kernel/acpi/wakeup.S
index a2295a3..b4e2ec3 100644
--- a/arch/i386/kernel/acpi/wakeup.S
+++ b/arch/i386/kernel/acpi/wakeup.S
@@ -13,6 +13,21 @@
# 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 4096
ENTRY(wakeup_start)
@@ -31,6 +46,11 @@
movw %cs, %ax
movw %ax, %ds # Make ds:0 point to wakeup_start
movw %ax, %ss
+
+ testl $1, beep_flags - wakeup_code
+ jz 1f
+ BEEP
+1:
mov $(wakeup_stack - wakeup_code), %sp # Private stack is needed for ASUS board
movw $0x0e00 + 'S', %fs:(0x12)
@@ -88,6 +108,10 @@
cmpl $0x12345678, %eax
jne bogus_real_magic
+ testl $2, beep_flags - wakeup_code
+ jz 1f
+ BEEP
+1:
ljmpl $__KERNEL_CS,$wakeup_pmode_return
real_save_gdt: .word 0
@@ -98,6 +122,7 @@
real_magic: .long 0
video_mode: .long 0
video_flags: .long 0
+beep_flags: .long 0
real_efer_save_restore: .long 0
real_save_efer_edx: .long 0
real_save_efer_eax: .long 0
@@ -262,6 +287,8 @@
movl %edx, video_mode - wakeup_start (%eax)
movl acpi_video_flags, %edx
movl %edx, video_flags - wakeup_start (%eax)
+ movl s2ram_beep, %edx
+ movl %edx, beep_flags - wakeup_start (%eax)
movl $0x12345678, real_magic - wakeup_start (%eax)
movl $0x12345678, saved_magic
popl %ebx
diff --git a/arch/x86_64/kernel/acpi/wakeup.S b/arch/x86_64/kernel/acpi/wakeup.S
index 8550a6f..ed63d18 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 @@
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 @@
.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 @@
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
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index fccd8b5..c0ccdd7 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -123,6 +123,7 @@
extern int sbf_port;
extern unsigned long acpi_video_flags;
+extern unsigned long s2ram_beep;
#else /* !CONFIG_ACPI */
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 32147b5..c74a564 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -332,6 +332,27 @@
power_attr(state);
+unsigned long s2ram_beep = 0;
+
+static ssize_t s2ram_beep_show(struct kset *kset, char *buf)
+{
+ return sprintf(buf, "%d\n", s2ram_beep);
+}
+
+static ssize_t
+s2ram_beep_store(struct kset *kset, const char *buf, size_t n)
+{
+ int val;
+
+ if (sscanf(buf, "%d", &val) > 0) {
+ s2ram_beep = val;
+ return n;
+ }
+ return -EINVAL;
+}
+
+power_attr(s2ram_beep);
+
#ifdef CONFIG_PM_TRACE
int pm_trace_enabled;
@@ -357,11 +378,13 @@
static struct attribute * g[] = {
&state_attr.attr,
&pm_trace_attr.attr,
+ &s2ram_beep_attr.attr,
NULL,
};
#else
static struct attribute * g[] = {
&state_attr.attr,
+ &s2ram_beep_attr.attr,
NULL,
};
#endif /* CONFIG_PM_TRACE */