Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0-only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /* ----------------------------------------------------------------------- *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *   Copyright (C) 1991, 1992 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *   Copyright 2007 rPath, Inc. - All Rights Reserved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * ----------------------------------------------------------------------- */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * The actual transition into protected mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/boot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/processor-flags.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <asm/segment.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	.text
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	.code16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * void protected_mode_jump(u32 entrypoint, u32 bootparams);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) SYM_FUNC_START_NOALIGN(protected_mode_jump)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	movl	%edx, %esi		# Pointer to boot_params table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	xorl	%ebx, %ebx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	movw	%cs, %bx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	shll	$4, %ebx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	addl	%ebx, 2f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	jmp	1f			# Short jump to serialize on 386/486
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	movw	$__BOOT_DS, %cx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	movw	$__BOOT_TSS, %di
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	movl	%cr0, %edx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	orb	$X86_CR0_PE, %dl	# Protected mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	movl	%edx, %cr0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	# Transition to 32-bit mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	.byte	0x66, 0xea		# ljmpl opcode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 2:	.long	.Lin_pm32		# offset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	.word	__BOOT_CS		# segment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) SYM_FUNC_END(protected_mode_jump)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	.code32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	.section ".text32","ax"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) SYM_FUNC_START_LOCAL_NOALIGN(.Lin_pm32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	# Set up data segments for flat 32-bit mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	movl	%ecx, %ds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	movl	%ecx, %es
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	movl	%ecx, %fs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	movl	%ecx, %gs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	movl	%ecx, %ss
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	# The 32-bit code sets up its own stack, but this way we do have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	# a valid stack if some debugging hack wants to use it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	addl	%ebx, %esp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	# Set up TR to make Intel VT happy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	ltr	%di
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	# Clear registers to allow for future extensions to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	# 32-bit boot protocol
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	xorl	%ecx, %ecx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	xorl	%edx, %edx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	xorl	%ebx, %ebx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	xorl	%ebp, %ebp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	xorl	%edi, %edi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	# Set up LDTR to make Intel VT happy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	lldt	%cx
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	jmpl	*%eax			# Jump to the 32-bit entrypoint
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) SYM_FUNC_END(.Lin_pm32)