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)  *  linux/arch/arm/lib/copypage.S
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *  Copyright (C) 1995-1999 Russell King
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *  ASM optimised string functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <asm/assembler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/asm-offsets.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/cache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define COPY_COUNT (PAGE_SZ / (2 * L1_CACHE_BYTES) PLD( -1 ))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 		.text
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 		.align	5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  * StrongARM optimised copy_page routine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * now 1.78bytes/cycle, was 1.60 bytes/cycle (50MHz bus -> 89MB/s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * Note that we probably achieve closer to the 100MB/s target with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * the core clock switching.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) ENTRY(copy_page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		stmfd	sp!, {r4, lr}			@	2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	PLD(	pld	[r1, #0]		)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	PLD(	pld	[r1, #L1_CACHE_BYTES]		)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		mov	r2, #COPY_COUNT			@	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		ldmia	r1!, {r3, r4, ip, lr}		@	4+1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 1:	PLD(	pld	[r1, #2 * L1_CACHE_BYTES])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	PLD(	pld	[r1, #3 * L1_CACHE_BYTES])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	.rept	(2 * L1_CACHE_BYTES / 16 - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		stmia	r0!, {r3, r4, ip, lr}		@	4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		ldmia	r1!, {r3, r4, ip, lr}		@	4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	.endr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		subs	r2, r2, #1			@	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		stmia	r0!, {r3, r4, ip, lr}		@	4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		ldmiagt	r1!, {r3, r4, ip, lr}		@	4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		bgt	1b				@	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	PLD(	ldmiaeq r1!, {r3, r4, ip, lr}	)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	PLD(	beq	2b			)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		ldmfd	sp!, {r4, pc}			@	3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) ENDPROC(copy_page)