2018-12-04 09:46:27 +00:00
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/* https://github.com/cirosantilli/x86-bare-metal-examples#apm */
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2015-09-06 23:16:58 +02:00
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#include "common.h"
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BEGIN
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movb $0x53,%ah #this is an APM command
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movb $0x0,%al #installation check command
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xorw %bx,%bx #device id (0 = APM BIOS)
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int $0x15 #call the BIOS function through interrupt 15h
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jc APM_error #if the carry flag is set there was an error
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#the function was successful
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#AX = APM version number
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#AH = Major revision number (in BCD format)
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#AL = Minor revision number (also BCD format)
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#BX = ASCII characters "P" (in BH) and "M" (in BL)
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#CX = APM flags (see the official documentation for more details)
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#disconnect from any APM interface
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movb $0x53,%ah #this is an APM command
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movb $0x4,%al #interface disconnect command
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xorw %bx,%bx #device id (0 = APM BIOS)
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int $0x15 #call the BIOS function through interrupt 15h
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jc .disconnect_error #if the carry flag is set see what the fuss is about.
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jmp .no_error
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.disconnect_error: #the error code is in ah.
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cmpb $0x3,%ah #if the error code is anything but 03h there was an error.
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jne APM_error #the error code 03h means that no interface was connected in the first place.
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.no_error:
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#the function was successful
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#Nothing is returned.
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#connect to an APM interface
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movb $0x53,%ah #this is an APM command
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movb $0x01,%al #see above description
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xorw %bx,%bx #device id (0 = APM BIOS)
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int $0x15 #call the BIOS function through interrupt 15h
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jc APM_error #if the carry flag is set there was an error
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#the function was successful
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#The return values are different for each interface.
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#The Real Mode Interface returns nothing.
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#See the official documentation for the
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#return values for the protected mode interfaces.
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#Enable power management for all devices
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movb $0x53,%ah #this is an APM command
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movb $0x8,%al #Change the state of power management...
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movw $0x001,%bx #...on all devices to...
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movw $0x001,%cx #...power management on.
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int $0x15 #call the BIOS function through interrupt 15h
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jc APM_error #if the carry flag is set there was an error
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#Set the power state for all devices
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movb $0x53,%ah #this is an APM command
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movb $0x07,%al #Set the power state...
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movw $0x0001,%bx #...on all devices to...
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movw $0x0003,%cx #see above
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int $0x15 #call the BIOS function through interrupt 15h
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jc APM_error #if the carry flag is set there was an error
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APM_error:
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hlt
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