iPXE
Functions
apm.c File Reference

Advanced Power Management. More...

#include <errno.h>
#include <realmode.h>
#include <ipxe/apm.h>

Go to the source code of this file.

Functions

 FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
int apm_poweroff (void)
 Power off the computer using APM.

Detailed Description

Advanced Power Management.

Definition in file apm.c.

Function Documentation

◆ FILE_LICENCE()

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL )

◆ apm_poweroff()

int apm_poweroff ( void )

Power off the computer using APM.

Return values
rcReturn status code

Definition at line 42 of file apm.c.

42 {
43 uint16_t apm_version;
44 uint16_t apm_signature;
45 uint16_t apm_flags;
46 uint16_t carry;
47
48 /* APM check */
49 __asm__ __volatile__ ( REAL_CODE ( "int $0x15\n\t"
50 "adc %%edx,0\n\t" )
51 : "=a" ( apm_version ), "=b" ( apm_signature ),
52 "=c" ( apm_flags ), "=d" ( carry )
53 : "a" ( 0x5300 ), "b" ( 0x0000 ),
54 "d" ( 0x0000 ) );
55 if ( carry ) {
56 DBG ( "APM not present\n" );
57 return -ENOTSUP;
58 }
59 if ( apm_signature != 0x504d ) { /* signature 'PM' */
60 DBG ( "APM not present\n" );
61 return -ENOTSUP;
62 }
63 if ( apm_version < 0x0101 ) { /* Need version 1.1+ */
64 DBG ( "APM 1.1+ not supported\n" );
65 return -ENOTSUP;
66 }
67 if ( ( apm_flags & 0x8 ) == 0x8 ) {
68 DBG ( "APM power management disabled\n" );
69 return -EPERM;
70 }
71 DBG2 ( "APM check completed\n" );
72
73 /* APM initialisation */
74 __asm__ __volatile__ ( REAL_CODE ( "int $0x15\n\t"
75 "adc %%edx,0\n\t" )
76 : "=d" ( carry )
77 : "a" ( 0x5301 ), "b" ( 0x0000 ),
78 "d" ( 0x0000 ) );
79 if ( carry ) {
80 DBG ( "APM initialisation failed\n" );
81 return -EIO;
82 }
83 DBG2 ( "APM initialisation completed\n" );
84
85 /* Set APM driver version */
86 __asm__ __volatile__ ( REAL_CODE ( "int $0x15\n\t"
87 "adc %%edx,0\n\t" )
88 : "=d" ( carry )
89 : "a" ( 0x530e ), "b" ( 0x0000 ),
90 "c" ( 0x0101 ), "d" ( 0x0000 ) );
91 if ( carry ) {
92 DBG ( "APM setting driver version failed\n" );
93 return -EIO;
94 }
95 DBG2 ( "APM driver version set\n" );
96
97 /* Setting power state to off */
98 __asm__ __volatile__ ( REAL_CODE ( "int $0x15\n\t"
99 "adc %%edx,0\n\t" )
100 : "=d" ( carry )
101 : "a" ( 0x5307 ), "b" ( 0x0001 ),
102 "c" ( 0x0003 ), "d" ( 0x0000) );
103 if ( carry ) {
104 DBG ( "APM setting power state failed\n" );
105 return -ENOTTY;
106 }
107
108 /* Should never happen */
109 return -ECANCELED;
110}
__volatile__
__asm__ __volatile__("call *%9" :"=a"(result), "=c"(discard_ecx), "=d"(discard_edx) :"d"(0), "a"(code), "b"(0), "c"(in_phys), "D"(0), "S"(out_phys), "m"(hypercall))
uint16_t
unsigned short uint16_t
Definition stdint.h:11
carry
int carry
Definition bigint.h:68
DBG2
#define DBG2(...)
Definition compiler.h:515
DBG
#define DBG(...)
Print a debugging message.
Definition compiler.h:498
EIO
#define EIO
Input/output error.
Definition errno.h:434
ENOTSUP
#define ENOTSUP
Operation not supported.
Definition errno.h:590
ECANCELED
#define ECANCELED
Operation canceled.
Definition errno.h:344
ENOTTY
#define ENOTTY
Inappropriate I/O control operation.
Definition errno.h:595
EPERM
#define EPERM
Operation not permitted.
Definition errno.h:615
REAL_CODE
#define REAL_CODE(asm_code_str)
Definition libkir.h:226
__asm__
__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")

References __asm__(), __volatile__(), carry, DBG, DBG2, ECANCELED, EIO, ENOTSUP, ENOTTY, EPERM, and REAL_CODE.

Referenced by bios_poweroff().

Generated by doxygen 1.14.0