BDS & Specific action: Code
Description
0x00
Report the legacy boot is happening
0x12
Wake up the Aps
0x13
Initialize SMM Private Data and relocate BSP SMBASE
0x21
PC init begin at the stage1
0x27
Report every memory range do the hard ware ECC init
0x28
Report status code of every memory range
0x50
Get the root bridge handle
0x51
Notify pci bus driver starts to program the resource
0x58
Reset the host controller
0x5A
IdeBus begin initialization
0x79
Report that the remote terminal is being disabled
0x7A
Report that the remote terminal is being enabled
0x90
Keyboard reset
0x91
USB Keyboard disable
0x92
Keyboard detection
0x93
Report that the usb keyboard is being enabled
0x94
Clear the keyboard buffer
0x95
Init Keyboard
0x98
Mouse reset
0x99
Mouse disable
0x9A
Detect PS2 mouse
0x9B
Report that the mouse is being enabled
0xB8
Peripheral removable media reset (ex: IsaFloppy, USB device)
0xB9
Peripheral removable media disable
0xBB
Peripheral removable media enable
0xE4
Report Status Code here for DXE_ENTRY_POINT once it is available
0xF8
Report that ExitBootServices() has been called
0xF9
Runtime driver set virtual address map
Chapter 3
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