Blame - arch/sh/lib/clear_page.S - android_kernel_htc_msm8960

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Paul Mundt	510c72ad	2006-11-27 12:06:26 +0900	[diff] [blame]	1	/*
Linus Torvalds	1da177e	2005-04-16 15:20:36 -0700	[diff] [blame]	2	* __clear_user_page, __clear_user, clear_page implementation of SuperH
				3	*
				4	* Copyright (C) 2001 Kaz Kojima
				5	* Copyright (C) 2001, 2002 Niibe Yutaka
Paul Mundt	510c72ad	2006-11-27 12:06:26 +0900	[diff] [blame]	6	* Copyright (C) 2006 Paul Mundt
Linus Torvalds	1da177e	2005-04-16 15:20:36 -0700	[diff] [blame]	7	*/
Linus Torvalds	1da177e	2005-04-16 15:20:36 -0700	[diff] [blame]	8	#include <linux/linkage.h>
Paul Mundt	510c72ad	2006-11-27 12:06:26 +0900	[diff] [blame]	9	#include <asm/page.h>
Linus Torvalds	1da177e	2005-04-16 15:20:36 -0700	[diff] [blame]	10
				11	/*
Paul Mundt	0dcb957	2007-11-23 13:55:02 +0900	[diff] [blame]	12	* clear_page
Linus Torvalds	1da177e	2005-04-16 15:20:36 -0700	[diff] [blame]	13	* @to: P1 address
				14	*
Paul Mundt	0dcb957	2007-11-23 13:55:02 +0900	[diff] [blame]	15	* void clear_page(void *to)
Linus Torvalds	1da177e	2005-04-16 15:20:36 -0700	[diff] [blame]	16	*/
				17
				18	/*
				19	* r0 --- scratch
				20	* r4 --- to
Paul Mundt	510c72ad	2006-11-27 12:06:26 +0900	[diff] [blame]	21	* r5 --- to + PAGE_SIZE
Linus Torvalds	1da177e	2005-04-16 15:20:36 -0700	[diff] [blame]	22	*/
Paul Mundt	0dcb957	2007-11-23 13:55:02 +0900	[diff] [blame]	23	ENTRY(clear_page)
Linus Torvalds	1da177e	2005-04-16 15:20:36 -0700	[diff] [blame]	24	mov r4,r5
Paul Mundt	510c72ad	2006-11-27 12:06:26 +0900	[diff] [blame]	25	mov.l .Llimit,r0
Linus Torvalds	1da177e	2005-04-16 15:20:36 -0700	[diff] [blame]	26	add r0,r5
				27	mov #0,r0
				28	!
				29	1:
Paul Mundt	5c0cbd7	2008-03-21 18:07:04 +0900	[diff] [blame]	30	#if defined(CONFIG_CPU_SH4)
Linus Torvalds	1da177e	2005-04-16 15:20:36 -0700	[diff] [blame]	31	movca.l r0,@r4
				32	mov r4,r1
Paul Mundt	5c0cbd7	2008-03-21 18:07:04 +0900	[diff] [blame]	33	#else
				34	mov.l r0,@r4
Linus Torvalds	1da177e	2005-04-16 15:20:36 -0700	[diff] [blame]	35	#endif
				36	add #32,r4
				37	mov.l r0,@-r4
				38	mov.l r0,@-r4
				39	mov.l r0,@-r4
				40	mov.l r0,@-r4
				41	mov.l r0,@-r4
				42	mov.l r0,@-r4
				43	mov.l r0,@-r4
				44	#if defined(CONFIG_CPU_SH4)
				45	ocbwb @r1
				46	#endif
				47	cmp/eq r5,r4
				48	bf/s 1b
				49	add #28,r4
				50	!
				51	rts
				52	nop
Paul Mundt	325df7f	2007-11-30 16:34:26 +0900	[diff] [blame]	53
				54	.balign 4
Paul Mundt	510c72ad	2006-11-27 12:06:26 +0900	[diff] [blame]	55	.Llimit: .long (PAGE_SIZE-28)
Linus Torvalds	1da177e	2005-04-16 15:20:36 -0700	[diff] [blame]	56
				57	ENTRY(__clear_user)
				58	!
				59	mov #0, r0
				60	mov #0xe0, r1 ! 0xffffffe0
				61	!
				62	! r4..(r4+31)&~32 -------- not aligned [ Area 0 ]
				63	! (r4+31)&~32..(r4+r5)&~32 -------- aligned [ Area 1 ]
				64	! (r4+r5)&~32..r4+r5 -------- not aligned [ Area 2 ]
				65	!
				66	! Clear area 0
				67	mov r4, r2
				68	!
				69	tst r1, r5 ! length < 32
				70	bt .Larea2 ! skip to remainder
				71	!
				72	add #31, r2
				73	and r1, r2
				74	cmp/eq r4, r2
				75	bt .Larea1
				76	mov r2, r3
				77	sub r4, r3
				78	mov r3, r7
				79	mov r4, r2
				80	!
				81	.L0: dt r3
				82	0: mov.b r0, @r2
				83	bf/s .L0
				84	add #1, r2
				85	!
				86	sub r7, r5
				87	mov r2, r4
				88	.Larea1:
				89	mov r4, r3
				90	add r5, r3
				91	and r1, r3
				92	cmp/hi r2, r3
				93	bf .Larea2
				94	!
				95	! Clear area 1
				96	#if defined(CONFIG_CPU_SH4)
				97	1: movca.l r0, @r2
				98	#else
				99	1: mov.l r0, @r2
				100	#endif
				101	add #4, r2
				102	2: mov.l r0, @r2
				103	add #4, r2
				104	3: mov.l r0, @r2
				105	add #4, r2
				106	4: mov.l r0, @r2
				107	add #4, r2
				108	5: mov.l r0, @r2
				109	add #4, r2
				110	6: mov.l r0, @r2
				111	add #4, r2
				112	7: mov.l r0, @r2
				113	add #4, r2
				114	8: mov.l r0, @r2
				115	add #4, r2
				116	cmp/hi r2, r3
				117	bt/s 1b
				118	nop
				119	!
				120	! Clear area 2
				121	.Larea2:
				122	mov r4, r3
				123	add r5, r3
				124	cmp/hs r3, r2
				125	bt/s .Ldone
				126	sub r2, r3
				127	.L2: dt r3
				128	9: mov.b r0, @r2
				129	bf/s .L2
				130	add #1, r2
				131	!
				132	.Ldone: rts
				133	mov #0, r0 ! return 0 as normal return
				134
				135	! return the number of bytes remained
				136	.Lbad_clear_user:
				137	mov r4, r0
				138	add r5, r0
				139	rts
				140	sub r2, r0
				141
				142	.section __ex_table,"a"
				143	.align 2
				144	.long 0b, .Lbad_clear_user
				145	.long 1b, .Lbad_clear_user
				146	.long 2b, .Lbad_clear_user
				147	.long 3b, .Lbad_clear_user
				148	.long 4b, .Lbad_clear_user
				149	.long 5b, .Lbad_clear_user
				150	.long 6b, .Lbad_clear_user
				151	.long 7b, .Lbad_clear_user
				152	.long 8b, .Lbad_clear_user
				153	.long 9b, .Lbad_clear_user
				154	.previous