| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/m32r/mm/page.S |
| 3 | * |
| 4 | * Clear/Copy page with CPU |
| 5 | * |
| 6 | * Copyright (C) 2004 The Free Software Initiative of Japan |
| 7 | * |
| 8 | * Written by Niibe Yutaka |
| 9 | * |
| 10 | * This file is subject to the terms and conditions of the GNU General Public |
| 11 | * License. See the file "COPYING" in the main directory of this archive |
| 12 | * for more details. |
| 13 | * |
| 14 | */ |
| 15 | .text |
| 16 | .global copy_page |
| 17 | /* |
| 18 | * copy_page (to, from) |
| 19 | * |
| 20 | * PAGE_SIZE = 4096-byte |
| 21 | * Cache line = 16-byte |
| 22 | * 16 * 256 |
| 23 | */ |
| 24 | .align 4 |
| 25 | copy_page: |
| 26 | ldi r2, #255 |
| 27 | ld r3, @r0 /* cache line allocate */ |
| 28 | ld r4, @r1+ |
| 29 | ld r5, @r1+ |
| 30 | ld r6, @r1+ |
| 31 | ld r7, @r1+ |
| 32 | .fillinsn |
| 33 | 0: |
| 34 | st r4, @r0 |
| 35 | st r5, @+r0 |
| 36 | st r6, @+r0 |
| 37 | st r7, @+r0 |
| 38 | ld r4, @r1+ |
| 39 | addi r0, #4 |
| 40 | ld r5, @r1+ |
| 41 | ld r6, @r1+ |
| 42 | ld r7, @r1+ |
| 43 | ld r3, @r0 /* cache line allocate */ |
| 44 | addi r2, #-1 |
| 45 | bnez r2, 0b |
| 46 | |
| 47 | st r4, @r0 |
| 48 | st r5, @+r0 |
| 49 | st r6, @+r0 |
| 50 | st r7, @+r0 |
| 51 | jmp r14 |
| 52 | |
| 53 | .text |
| 54 | .global clear_page |
| 55 | /* |
| 56 | * clear_page (to) |
| 57 | * |
| 58 | * PAGE_SIZE = 4096-byte |
| 59 | * Cache line = 16-byte |
| 60 | * 16 * 256 |
| 61 | */ |
| 62 | .align 4 |
| 63 | clear_page: |
| 64 | ldi r2, #255 |
| 65 | ldi r4, #0 |
| 66 | ld r3, @r0 /* cache line allocate */ |
| 67 | .fillinsn |
| 68 | 0: |
| 69 | st r4, @r0 |
| 70 | st r4, @+r0 |
| 71 | st r4, @+r0 |
| 72 | st r4, @+r0 |
| 73 | addi r0, #4 |
| 74 | ld r3, @r0 /* cache line allocate */ |
| 75 | addi r2, #-1 |
| 76 | bnez r2, 0b |
| 77 | |
| 78 | st r4, @r0 |
| 79 | st r4, @+r0 |
| 80 | st r4, @+r0 |
| 81 | st r4, @+r0 |
| 82 | jmp r14 |