iPXE
bios_reboot.c
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1 /*
2  * Copyright (C) 2010 Michael Brown <mbrown@fensystems.co.uk>.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License as
6  * published by the Free Software Foundation; either version 2 of the
7  * License, or any later version.
8  *
9  * This program is distributed in the hope that it will be useful, but
10  * WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17  * 02110-1301, USA.
18  *
19  * You can also choose to distribute this program under the terms of
20  * the Unmodified Binary Distribution Licence (as given in the file
21  * COPYING.UBDL), provided that you have satisfied its requirements.
22  */
23 
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
25 
26 /** @file
27  *
28  * Standard PC-BIOS reboot mechanism
29  *
30  */
31 
32 #include <ipxe/reboot.h>
33 #include <realmode.h>
34 #include <bios.h>
35 #include <ipxe/apm.h>
36 #include <ipxe/acpipwr.h>
37 
38 /**
39  * Reboot system
40  *
41  * @v warm Perform a warm reboot
42  */
43 static void bios_reboot ( int warm ) {
44  uint16_t flag;
45 
46  /* Configure BIOS for cold/warm reboot */
47  flag = ( warm ? BDA_REBOOT_WARM : 0 );
49 
50  /* Jump to system reset vector */
51  __asm__ __volatile__ ( REAL_CODE ( "ljmp $0xf000, $0xfff0" ) : );
52 }
53 
54 /**
55  * Power off system
56  *
57  * @ret rc Return status code
58  */
59 static int bios_poweroff ( void ) {
60  int rc;
61 
62  /* Try APM */
63  if ( ( rc = apm_poweroff() ) != 0 )
64  DBG ( "APM power off failed: %s\n", strerror ( rc ) );
65 
66  /* Try ACPI */
67  if ( ( rc = acpi_poweroff() ) != 0 )
68  DBG ( "ACPI power off failed: %s\n", strerror ( rc ) );
69 
70  return rc;
71 }
72 
73 PROVIDE_REBOOT ( pcbios, reboot, bios_reboot );
PROVIDE_REBOOT(pcbios, reboot, bios_reboot)
struct arbelprm_rc_send_wqe rc
Definition: arbel.h:14
unsigned short uint16_t
Definition: stdint.h:11
int acpi_poweroff(void)
Power off the computer using ACPI.
Definition: acpipwr.c:50
FILE_LICENCE(GPL2_OR_LATER_OR_UBDL)
ACPI power off.
#define BDA_REBOOT_WARM
Definition: bios.h:13
static int bios_poweroff(void)
Power off system.
Definition: bios_reboot.c:59
#define BDA_REBOOT
Definition: bios.h:12
#define put_real
Definition: libkir.h:150
iPXE reboot API
int poweroff(void)
Power off system.
static void bios_reboot(int warm)
Reboot system.
Definition: bios_reboot.c:43
char * strerror(int errno)
Retrieve string representation of error number.
Definition: strerror.c:78
#define BDA_SEG
Definition: bios.h:6
__asm__ __volatile__("\n1:\n\t" "movb -1(%2,%1), %%al\n\t" "stosb\n\t" "loop 1b\n\t" "xorl %%eax, %%eax\n\t" "mov %3, %1\n\t" "rep stosb\n\t" :"=&D"(discard_D), "=&c"(discard_c) :"r"(data), "g"(pad_len), "0"(value0), "1"(len) :"eax")
int apm_poweroff(void)
Power off the computer using APM.
Definition: apm.c:42
__asm__(".section \".rodata\", \"a\", " PROGBITS "\n\t" "\nprivate_key_data:\n\t" ".size private_key_data, ( . - private_key_data )\n\t" ".equ private_key_len, ( . - private_key_data )\n\t" ".previous\n\t")
Advanced Power Management.
void reboot(int warm)
Reboot system.
#define DBG(...)
Print a debugging message.
Definition: compiler.h:498
#define REAL_CODE(asm_code_str)
Definition: libkir.h:226
uint16_t flag
Flag number.
Definition: hyperv.h:14