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PM: Optional beeping during resume from suspend to RAM

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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>
This commit is contained in:
Nigel Cunningham 2007-07-19 01:47:41 -07:00 committed by Linus Torvalds
parent bd804eba1c
commit 5a60d6235c
4 changed files with 76 additions and 0 deletions
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27
arch/i386/kernel/acpi/wakeup.S
View file

@ -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 @@ wakeup_code:
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 @@ wakeup_code:
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_save_cr4: .long 0
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 @@ ENTRY(acpi_copy_wakeup_routine)
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

25
arch/x86_64/kernel/acpi/wakeup.S
View file

@ -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

1
include/linux/acpi.h
View file

@ -123,6 +123,7 @@ extern int pci_mmcfg_config_num;
extern int sbf_port;
extern unsigned long acpi_video_flags;
extern unsigned long s2ram_beep;
#else /* !CONFIG_ACPI */

23
kernel/power/main.c
View file

@ -332,6 +332,27 @@ static ssize_t state_store(struct kset *kset, const char *buf, size_t n)
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 @@ power_attr(pm_trace);
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 */