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intwrapped halt

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-04-04 18:42:48 +02:00
parent 1b8cb8573b
commit 42c4f00016
3 changed files with 65 additions and 61 deletions
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64
commands/i386/pc/halt.c
View file

@ -21,6 +21,7 @@
#include <grub/misc.h>
#include <grub/extcmd.h>
#include <grub/i18n.h>
#include <grub/machine/int.h>
static const struct grub_arg_option options[] =
{
@ -28,6 +29,69 @@ static const struct grub_arg_option options[] =
{0, 0, 0, 0, 0, 0}
};
static inline void __attribute__ ((noreturn))
stop (void)
{
while (1)
{
asm volatile ("hlt");
}
}
/*
* Halt the system, using APM if possible. If NO_APM is true, don't use
* APM even if it is available.
*/
void
grub_halt (int no_apm)
{
struct grub_bios_int_registers regs;
if (no_apm)
stop ();
/* detect APM */
regs.eax = 0x5300;
regs.ebx = 0;
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
grub_bios_interrupt (0x15, &regs);
if (regs.flags & GRUB_CPU_INT_FLAGS_CARRY)
stop ();
/* disconnect APM first */
regs.eax = 0x5304;
regs.ebx = 0;
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
grub_bios_interrupt (0x15, &regs);
/* connect APM */
regs.eax = 0x5301;
regs.ebx = 0;
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
grub_bios_interrupt (0x15, &regs);
if (regs.flags & GRUB_CPU_INT_FLAGS_CARRY)
stop ();
/* set APM protocol level - 1.1 or bust. (this covers APM 1.2 also) */
regs.eax = 0x530E;
regs.ebx = 0;
regs.ecx = 0x0101;
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
grub_bios_interrupt (0x15, &regs);
if (regs.flags & GRUB_CPU_INT_FLAGS_CARRY)
stop ();
/* set the power state to off */
regs.eax = 0x5307;
regs.ebx = 1;
regs.ecx = 3;
regs.flags = GRUB_CPU_INT_FLAGS_DEFAULT;
grub_bios_interrupt (0x15, &regs);
/* shouldn't reach here */
stop ();
}
static grub_err_t
grub_cmd_halt (grub_extcmd_t cmd,
int argc __attribute__ ((unused)),

2
include/grub/misc.h
View file

@ -298,7 +298,7 @@ void EXPORT_FUNC (grub_reboot) (void);
#ifdef GRUB_MACHINE_PCBIOS
/* Halt the system, using APM if possible. If NO_APM is true, don't
* use APM even if it is available. */
void EXPORT_FUNC (grub_halt) (int no_apm);
void grub_halt (int no_apm);
#else
void EXPORT_FUNC (grub_halt) (void);
#endif

60
kern/i386/pc/startup.S
View file

@ -450,16 +450,6 @@ gate_a20_check_state:
*/
. = _start + GRUB_KERNEL_MACHINE_RAW_SIZE
/*
* This next part is sort of evil. It takes advantage of the
* byte ordering on the x86 to work in either 16-bit or 32-bit
* mode, so think about it before changing it.
*/
FUNCTION(grub_hard_stop)
hlt
jmp EXT_C(grub_hard_stop)
/*
* grub_stop_floppy()
@ -486,56 +476,6 @@ FUNCTION(grub_exit)
jmp cold_reboot
.code32
/*
* grub_halt(int no_apm)
*
* Halt the system, using APM if possible. If NO_APM is true, don't use
* APM even if it is available.
*/
FUNCTION(grub_halt)
/* see if zero */
testl %eax, %eax
jnz EXT_C(grub_stop)
call prot_to_real
.code16
/* detect APM */
movw $0x5300, %ax
xorw %bx, %bx
int $0x15
jc EXT_C(grub_hard_stop)
/* don't check %bx for buggy BIOSes... */
/* disconnect APM first */
movw $0x5304, %ax
xorw %bx, %bx
int $0x15
/* connect APM */
movw $0x5301, %ax
xorw %bx, %bx
int $0x15
jc EXT_C(grub_hard_stop)
/* set APM protocol level - 1.1 or bust. (this covers APM 1.2 also) */
movw $0x530E, %ax
xorw %bx, %bx
movw $0x0101, %cx
int $0x15
jc EXT_C(grub_hard_stop)
/* set the power state to off */
movw $0x5307, %ax
movw $1, %bx
movw $3, %cx
int $0x15
/* shouldn't reach here */
jmp EXT_C(grub_hard_stop)
.code32
/*
* void grub_chainloader_real_boot (int drive, void *part_addr)
*