projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d73e60b7 RK |
1 | /* |
| 2 | * linux/arch/arm/mm/copypage-v3.c | |
| 3 | * | |
| 4 | * Copyright (C) 1995-1999 Russell King | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | */ | |
| 10 | #include <linux/init.h> | |
| 063b0a42 | 11 | #include <linux/highmem.h> |
| d73e60b7 RK |
12 | |
| 13 | /* | |
| 063b0a42 | 14 | * ARMv3 optimised copy_user_highpage |
| d73e60b7 RK |
15 | * |
| 16 | * FIXME: do we need to handle cache stuff... | |
| 17 | */ | |
| 063b0a42 RK |
18 | static void __attribute__((naked)) |
| 19 | v3_copy_user_page(void *kto, const void *kfrom) | |
| d73e60b7 RK |
20 | { |
| 21 | asm("\n\ | |
| 22 | stmfd sp!, {r4, lr} @ 2\n\ | |
| 23 | mov r2, %2 @ 1\n\ | |
| 24 | ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\ | |
| 25 | 1: stmia %1!, {r3, r4, ip, lr} @ 4\n\ | |
| 26 | ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\ | |
| 27 | stmia %1!, {r3, r4, ip, lr} @ 4\n\ | |
| 28 | ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\ | |
| 29 | stmia %1!, {r3, r4, ip, lr} @ 4\n\ | |
| 30 | ldmia %0!, {r3, r4, ip, lr} @ 4\n\ | |
| 31 | subs r2, r2, #1 @ 1\n\ | |
| 32 | stmia %1!, {r3, r4, ip, lr} @ 4\n\ | |
| 33 | ldmneia %0!, {r3, r4, ip, lr} @ 4\n\ | |
| 34 | bne 1b @ 1\n\ | |
| 35 | ldmfd sp!, {r4, pc} @ 3" | |
| 36 | : | |
| 37 | : "r" (kfrom), "r" (kto), "I" (PAGE_SIZE / 64)); | |
| 38 | } | |
| 39 | ||
| 063b0a42 RK |
40 | void v3_copy_user_highpage(struct page *to, struct page *from, |
| 41 | unsigned long vaddr) | |
| 42 | { | |
| 43 | void *kto, *kfrom; | |
| 44 | ||
| 45 | kto = kmap_atomic(to, KM_USER0); | |
| 46 | kfrom = kmap_atomic(from, KM_USER1); | |
| 47 | v3_copy_user_page(kto, kfrom); | |
| 48 | kunmap_atomic(kfrom, KM_USER1); | |
| 49 | kunmap_atomic(kto, KM_USER0); | |
| 50 | } | |
| 51 | ||
| d73e60b7 RK |
52 | /* |
| 53 | * ARMv3 optimised clear_user_page | |
| 54 | * | |
| 55 | * FIXME: do we need to handle cache stuff... | |
| 56 | */ | |
| 57 | void __attribute__((naked)) v3_clear_user_page(void *kaddr, unsigned long vaddr) | |
| 58 | { | |
| 59 | asm("\n\ | |
| 60 | str lr, [sp, #-4]!\n\ | |
| 61 | mov r1, %1 @ 1\n\ | |
| 62 | mov r2, #0 @ 1\n\ | |
| 63 | mov r3, #0 @ 1\n\ | |
| 64 | mov ip, #0 @ 1\n\ | |
| 65 | mov lr, #0 @ 1\n\ | |
| 66 | 1: stmia %0!, {r2, r3, ip, lr} @ 4\n\ | |
| 67 | stmia %0!, {r2, r3, ip, lr} @ 4\n\ | |
| 68 | stmia %0!, {r2, r3, ip, lr} @ 4\n\ | |
| 69 | stmia %0!, {r2, r3, ip, lr} @ 4\n\ | |
| 70 | subs r1, r1, #1 @ 1\n\ | |
| 71 | bne 1b @ 1\n\ | |
| 72 | ldr pc, [sp], #4" | |
| 73 | : | |
| 74 | : "r" (kaddr), "I" (PAGE_SIZE / 64)); | |
| 75 | } | |
| 76 | ||
| 77 | struct cpu_user_fns v3_user_fns __initdata = { | |
| 78 | .cpu_clear_user_page = v3_clear_user_page, | |
| 063b0a42 | 79 | .cpu_copy_user_highpage = v3_copy_user_highpage, |
| d73e60b7 | 80 | }; |