diff options
Diffstat (limited to 'arch/sh/mm/clear_page.S')
| -rw-r--r-- | arch/sh/mm/clear_page.S | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/arch/sh/mm/clear_page.S b/arch/sh/mm/clear_page.S new file mode 100644 index 00000000000..ae58a61f0e6 --- /dev/null +++ b/arch/sh/mm/clear_page.S @@ -0,0 +1,295 @@ +/* $Id: clear_page.S,v 1.13 2003/08/25 17:03:10 lethal Exp $ + * + * __clear_user_page, __clear_user, clear_page implementation of SuperH + * + * Copyright (C) 2001 Kaz Kojima + * Copyright (C) 2001, 2002 Niibe Yutaka + * + */ +#include <linux/config.h> +#include <linux/linkage.h> + +/* + * clear_page_slow + * @to: P1 address + * + * void clear_page_slow(void *to) + */ + +/* + * r0 --- scratch + * r4 --- to + * r5 --- to + 4096 + */ +ENTRY(clear_page_slow) + mov r4,r5 + mov.w .Llimit,r0 + add r0,r5 + mov #0,r0 + ! +1: +#if defined(CONFIG_CPU_SH3) + mov.l r0,@r4 +#elif defined(CONFIG_CPU_SH4) + movca.l r0,@r4 + mov r4,r1 +#endif + add #32,r4 + mov.l r0,@-r4 + mov.l r0,@-r4 + mov.l r0,@-r4 + mov.l r0,@-r4 + mov.l r0,@-r4 + mov.l r0,@-r4 + mov.l r0,@-r4 +#if defined(CONFIG_CPU_SH4) + ocbwb @r1 +#endif + cmp/eq r5,r4 + bf/s 1b + add #28,r4 + ! + rts + nop +.Llimit: .word (4096-28) + +ENTRY(__clear_user) + ! + mov #0, r0 + mov #0xe0, r1 ! 0xffffffe0 + ! + ! r4..(r4+31)&~32 -------- not aligned [ Area 0 ] + ! (r4+31)&~32..(r4+r5)&~32 -------- aligned [ Area 1 ] + ! (r4+r5)&~32..r4+r5 -------- not aligned [ Area 2 ] + ! + ! Clear area 0 + mov r4, r2 + ! + tst r1, r5 ! length < 32 + bt .Larea2 ! skip to remainder + ! + add #31, r2 + and r1, r2 + cmp/eq r4, r2 + bt .Larea1 + mov r2, r3 + sub r4, r3 + mov r3, r7 + mov r4, r2 + ! +.L0: dt r3 +0: mov.b r0, @r2 + bf/s .L0 + add #1, r2 + ! + sub r7, r5 + mov r2, r4 +.Larea1: + mov r4, r3 + add r5, r3 + and r1, r3 + cmp/hi r2, r3 + bf .Larea2 + ! + ! Clear area 1 +#if defined(CONFIG_CPU_SH4) +1: movca.l r0, @r2 +#else +1: mov.l r0, @r2 +#endif + add #4, r2 +2: mov.l r0, @r2 + add #4, r2 +3: mov.l r0, @r2 + add #4, r2 +4: mov.l r0, @r2 + add #4, r2 +5: mov.l r0, @r2 + add #4, r2 +6: mov.l r0, @r2 + add #4, r2 +7: mov.l r0, @r2 + add #4, r2 +8: mov.l r0, @r2 + add #4, r2 + cmp/hi r2, r3 + bt/s 1b + nop + ! + ! Clear area 2 +.Larea2: + mov r4, r3 + add r5, r3 + cmp/hs r3, r2 + bt/s .Ldone + sub r2, r3 +.L2: dt r3 +9: mov.b r0, @r2 + bf/s .L2 + add #1, r2 + ! +.Ldone: rts + mov #0, r0 ! return 0 as normal return + + ! return the number of bytes remained +.Lbad_clear_user: + mov r4, r0 + add r5, r0 + rts + sub r2, r0 + +.section __ex_table,"a" + .align 2 + .long 0b, .Lbad_clear_user + .long 1b, .Lbad_clear_user + .long 2b, .Lbad_clear_user + .long 3b, .Lbad_clear_user + .long 4b, .Lbad_clear_user + .long 5b, .Lbad_clear_user + .long 6b, .Lbad_clear_user + .long 7b, .Lbad_clear_user + .long 8b, .Lbad_clear_user + .long 9b, .Lbad_clear_user +.previous + +#if defined(CONFIG_CPU_SH4) +/* + * __clear_user_page + * @to: P3 address (with same color) + * @orig_to: P1 address + * + * void __clear_user_page(void *to, void *orig_to) + */ + +/* + * r0 --- scratch + * r4 --- to + * r5 --- orig_to + * r6 --- to + 4096 + */ +ENTRY(__clear_user_page) + mov.w .L4096,r0 + mov r4,r6 + add r0,r6 + mov #0,r0 + ! +1: ocbi @r5 + add #32,r5 + movca.l r0,@r4 + mov r4,r1 + add #32,r4 + mov.l r0,@-r4 + mov.l r0,@-r4 + mov.l r0,@-r4 + mov.l r0,@-r4 + mov.l r0,@-r4 + mov.l r0,@-r4 + mov.l r0,@-r4 + add #28,r4 + cmp/eq r6,r4 + bf/s 1b + ocbwb @r1 + ! + rts + nop +.L4096: .word 4096 + +ENTRY(__flush_cache_4096) + mov.l 1f,r3 + add r6,r3 + mov r4,r0 + mov #64,r2 + shll r2 + mov #64,r6 + jmp @r3 + mov #96,r7 + .align 2 +1: .long 2f +2: + .rept 32 + mov.l r5,@r0 + mov.l r5,@(32,r0) + mov.l r5,@(r0,r6) + mov.l r5,@(r0,r7) + add r2,r5 + add r2,r0 + .endr + nop + nop + nop + nop + nop + nop + nop + rts + nop + +ENTRY(__flush_dcache_all) + mov.l 2f,r0 + mov.l 3f,r4 + and r0,r4 ! r4 = (unsigned long)&empty_zero_page[0] & ~0xffffc000 + stc sr,r1 ! save SR + mov.l 4f,r2 + or r1,r2 + mov #32,r3 + shll2 r3 +1: + ldc r2,sr ! set BL bit + movca.l r0,@r4 + ocbi @r4 + add #32,r4 + movca.l r0,@r4 + ocbi @r4 + add #32,r4 + movca.l r0,@r4 + ocbi @r4 + add #32,r4 + movca.l r0,@r4 + ocbi @r4 + ldc r1,sr ! restore SR + dt r3 + bf/s 1b + add #32,r4 + + rts + nop + .align 2 +2: .long 0xffffc000 +3: .long empty_zero_page +4: .long 0x10000000 ! BL bit + +/* __flush_cache_4096_all(unsigned long addr) */ +ENTRY(__flush_cache_4096_all) + mov.l 2f,r0 + mov.l 3f,r2 + and r0,r2 + or r2,r4 ! r4 = addr | (unsigned long)&empty_zero_page[0] & ~0x3fff + stc sr,r1 ! save SR + mov.l 4f,r2 + or r1,r2 + mov #32,r3 +1: + ldc r2,sr ! set BL bit + movca.l r0,@r4 + ocbi @r4 + add #32,r4 + movca.l r0,@r4 + ocbi @r4 + add #32,r4 + movca.l r0,@r4 + ocbi @r4 + add #32,r4 + movca.l r0,@r4 + ocbi @r4 + ldc r1,sr ! restore SR + dt r3 + bf/s 1b + add #32,r4 + + rts + nop + .align 2 +2: .long 0xffffc000 +3: .long empty_zero_page +4: .long 0x10000000 ! BL bit +#endif |