serial_keyboard_init()

serial_keyboard_init.S

/* refer to osfmk/console/serial_general.c */

.globl _cereal64
_cereal64:
	/* do the important parts of serial_keyboard_init() */
	stp  x20, x19, [sp, #-0x20]!
	stp  x29, x30, [sp, #0x10]
	add  x29, sp,  #0x20
	sub  sp,  sp,  #0x10
	
	/* kernel_thread_start_priority(serial_keyboard_start, NULL, MAXPRI_KERNEL, &thread); */
	adr  x0,  L_serial_keyboard_start_ptr
	ldr  x0,  [x0]
	mov  x1,  #0
	mov  w2,  #0x5f
	mov  x3,  sp
	bl   _kernel_thread_start_priority_stub
	
	/* return 1 if kernel_thread_start_priority() failed */
	mov  x19, x0
	mov  x0,  #1
	cbnz x19, L_return
	
	/* thread_deallocate(thread); */
	ldr  x0,  [sp]
	bl   _thread_deallocate_stub
	
	/* return 0 on success */
	mov  x0,  #0
L_return:	
	sub  sp,  x29, #0x20
	ldp  x29, x30, [sp, #0x10]
	ldp  x20, x19, [sp], #0x20
	ret

/* kext-ish stubs */
.global _kernel_thread_start_priority_stub
_kernel_thread_start_priority_stub:
	adr  x16, L_kernel_thread_start_priority_ptr
	ldr  x16, [x16]
	br   x16

.global _thread_deallocate_stub
_thread_deallocate_stub:
	adr  x16, L_thread_deallocate_ptr
	ldr  x16, [x16]
	br   x16

/* replace with the appropriate pointers */
/* there are no symbols for these :(     */
.align 4
L_serial_keyboard_start_ptr:
	.quad 0xCCCCCCCCCCCCCCCC
.align 4
L_kernel_thread_start_priority_ptr:
	.quad 0xDDDDDDDDDDDDDDDD
.align 4
L_thread_deallocate_ptr:
	.quad 0xEEEEEEEEEEEEEEEE