UEFI notes
==========

/efi/boot/bootx64.efi

rcx: efi handle
rdx: efi system table pointer
rsp: return address?

after loading call EFI_BOOT_SERVICES.ExitBootServices()

struct EFI_TABLE_HEADER {
	uint64_t signature;
	uint32_t revision;
	uint32_t header_size;
	uint32_t crc32;
	uint32_t rsvd;
};

EFI_SYSTEM_TABLE signature: 0x5453595320494249
0	EFI_TABLE_HEADER
24	wchar_t *firmware_vendor
32	uint32_t firmware_revision
36	padding
40	void *console_in_handle
48	EFI_SIMPLE_TEXT_INPUT_PROTOCOL*
56	void *console_out_handle
64	EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL*
72	void *stderr_handle
80	EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL*
88	EFI_RUNTIME_SERVICES *runtime_services;
96	EFI_BOOT_SERVICES *boot_services;
	uint64_t num_of_table_entries;
	EFI_CONFIGURATION_TABLE *cfg_table;

EFI_BOOT_SERVICES signature: 0x56524553544f4f42
0	EFI_TABLE_HEADER
24	EFI_RAISE_TPL
32	EFI_RESTORE_TPL
40	EFI_ALLOCATE_PAGES
48	EFI_FREE_PAGES
56	EFI_GET_MEMORY_MAP
64	EFI_ALLOCATE_POOL
72	EFI_FREE_POOL
80	EFI_CREATE_EVENT
88	EFI_SET_TIMER
96	EFI_WAIT_FOR_EVENT
104	EFI_SIGNAL_EVENT
112	EFI_CLOSE_EVENT
120	EFI_CHECK_EVENT
128	EFI_INSTALL_PROTOCOL_INTERFACE
136	EFI_REINSTALL_PROTOCOL_INTERFACE
144	EFI_UNINSTALL_PROTOCOL_INTERFACE
152	EFI_HANDLE_PROTOCOL
160	void *rsvd
168	EFI_REGISTER_PROTOCOL_NOTIFY
176	EFI_LOCATE_HANDLE
184	EFI_LOCATE_DEVICE_PATH
192	EFI_INSTALL_CONFIGURATION_TABLE
200	EFI_IMAGE_LOAD
208	EFI_IMAGE_START
216	EFI_EXIT
224	EFI_IMAGE_UNLOAD
232	EFI_EXIT_BOOT_SERVICES
	... more ...

EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL {
0	EFI_TEXT_RESET
8	EFI_TEXT_STRING
16	EFI_TEXT_TEST_STRING
24	EFI_TEXT_QUERY_MODE
32	EFI_TEXT_SET_MODE
40	EFI_TEXT_SET_ATTRIBUTE
48	EFI_TEXT_CLEAR_SCREEN
56	EFI_TEXT_SET_CURSOR_POSITION
64	EFI_TEXT_ENABLE_CURSOR
72	SIMPLE_TEXT_OUPUT_MODE *mode;
};