Bootblock hack

.globl bootblock_protected_mode_entry
bootblock_protected_mode_entry:

	/* Save the BIST value */
	movl	%eax, %ebp

	post_code(POST_ENTER_PROTECTED_MODE)

	movw	$ROM_DATA_SEG, %ax
	movw	%ax, %ds
	movw	%ax, %es
	movw	%ax, %ss
	movw	%ax, %fs
	movw	%ax, %gs

	/* Restore the BIST value to %eax */
	movl	%ebp, %eax

	/*
	 * Add some test code to see if we can flash the keyboard
	 * backlight as a way to try to determine if there is any
	 * life at all or whether the CSE has something against us.
	 *
	 * The LPC device implemented in the chipset is PCI device
	 * 1f.0 and the Apollo Lake documentation suggests that it
	 * is enabled by default.  Enable the decode of the IO ranges
	 * for the EC and then send some commands to it!
	 *
	 * The LPC PCI device has two 16bit registers - IO decode (IOD)
	 * at offset 0x80 and IO Enable (IOE) at offset 0x82.  We need
	 * to set bits 13..10 in the IOE register.
	 */
	movl	$0x8000f880 , %eax
	movw	$0xcf8, %dx
	outl	%eax, %dx

	movl	$0x3c030000, %eax	/* <-- Is this byte order correct? */
	movw	$0xcfc, %dx
	outl	%eax, %dx

switch_on:
	/* Send the command to the EC to turn the keyboard backlight on */
	movb	$0x81, %al              /* EC write command */
	movw	$0x66, %dx
	outb	%al, %dx

	movb	$0x19, %al              /* Register 0x19 */
	movw	$0x62, %dx
	outb	%al, %dx

	movb	$0xee, %al              /* Value 0xee */
	outb	%al, %dx

	/* Delay for a while */
wait1:
	movl	$0x00010000, %ecx
	nop
	loop	wait1

	/* Send the command to the EC to turn the keyboard backlight off */
	movb	$0x81, %al              /* EC write command */
	movw	$0x66, %dx
	outb	%al, %dx

	movb	$0x19, %al              /* Register 0x19 */
	movw	$0x62, %dx
	outb	%al, %dx

	movb	$0x00, %al              /* Value 0x00 */
	outb	%al, %dx

	/* Delay for a while */
wait2:
	movl	$0x00010000, %ecx
	nop
	loop	wait2

	jmp	switch_on