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AX = 5303h BX = device ID of system BIOS (0000h)
Return:
CF clear if successful AX = real-mode segment base address of protected-mode 32-bit code segment EBX = offset of entry point CX = real-mode segment base address of protected-mode 16-bit code segment DX = real-mode segment base address of protected-mode 16-bit data segment ---APM v1.1--- SI = APM BIOS code segment length DI = APM BIOS data segment length CF set on error AH = error code (02h,05h,07h,08h,09h) (see #00473)
Notes: The caller must initialize three consecutive descriptors with the returned segment base addresses for 32-bit code, 16-bit code, and 16-bit data, respectively; these descriptors must be valid whenever the protected-mode interface is called, and will have their limits arbitrarily set to 64K.. The protected mode interface is invoked by making a far call to the 32-bit code segment with the same register values as for INT 15; it must be invoked while CPL=0, the code segment descriptor must have a DPL of 0, the stack must be in a 32-bit segment and have enough room for BIOS use and possible interrupts, and the current I/O permission bit map must allow access to the I/O ports used for power management.. Functions 00h-03h are not available from protected mode. On connection, an APM v1.1 or v1.2 BIOS switches to APM v1.0 compatibility mode until it is informed that the user supports a newer version of APM (see AX=530Eh)
See Also: AX=5301h - AX=5302h - AX=5304h
Category: Power Management - Int 15h - A
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