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x86, reboot: Move the real-mode reboot code to an assembly file

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Move the real-mode reboot code out to an assembly file (reboot_32.S)
which is allocated using the common lowmem trampoline allocator.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
LKML-Reference: <4D5DFBE4.7090104@intel.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Matthieu Castet <castet.matthieu@free.fr>
This commit is contained in:
H. Peter Anvin
2011-02-14 18:36:03 -08:00
parent 014eea518a
commit 3d35ac346e
5 changed files with 160 additions and 105 deletions
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12
arch/x86/kernel/apm_32.c
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@@ -975,20 +975,10 @@ recalc:
static void apm_power_off(void)
{
unsigned char po_bios_call[] = {
0xb8, 0x00, 0x10, /* movw $0x1000,ax */
0x8e, 0xd0, /* movw ax,ss */
0xbc, 0x00, 0xf0, /* movw $0xf000,sp */
0xb8, 0x07, 0x53, /* movw $0x5307,ax */
0xbb, 0x01, 0x00, /* movw $0x0001,bx */
0xb9, 0x03, 0x00, /* movw $0x0003,cx */
0xcd, 0x15 /* int $0x15 */
};
/* Some bioses don't like being called from CPU != 0 */
if (apm_info.realmode_power_off) {
set_cpus_allowed_ptr(current, cpumask_of(0));
machine_real_restart(po_bios_call, sizeof(po_bios_call));
machine_real_restart(MRR_APM);
} else {
(void)set_system_power_state(APM_STATE_OFF);
}