Annotation of sys/arch/arm/arm/bcopy_page.S, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: bcopy_page.S,v 1.1 2004/02/01 05:09:48 drahn Exp $ */
! 2: /* $NetBSD: bcopy_page.S,v 1.7 2003/10/13 21:03:13 scw Exp $ */
! 3:
! 4:
! 5: /*
! 6: * Copyright (c) 1995 Scott Stevens
! 7: * All rights reserved.
! 8: *
! 9: * Redistribution and use in source and binary forms, with or without
! 10: * modification, are permitted provided that the following conditions
! 11: * are met:
! 12: * 1. Redistributions of source code must retain the above copyright
! 13: * notice, this list of conditions and the following disclaimer.
! 14: * 2. Redistributions in binary form must reproduce the above copyright
! 15: * notice, this list of conditions and the following disclaimer in the
! 16: * documentation and/or other materials provided with the distribution.
! 17: * 3. All advertising materials mentioning features or use of this software
! 18: * must display the following acknowledgement:
! 19: * This product includes software developed by Scott Stevens.
! 20: * 4. The name of the author may not be used to endorse or promote products
! 21: * derived from this software without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 24: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 25: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 26: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 27: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 28: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 29: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 30: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 31: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 32: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 33: *
! 34: * RiscBSD kernel project
! 35: *
! 36: * bcopy_page.S
! 37: *
! 38: * page optimised bcopy and bzero routines
! 39: *
! 40: * Created : 08/04/95
! 41: */
! 42:
! 43: #include <machine/asm.h>
! 44:
! 45: #include "assym.h"
! 46:
! 47: #ifndef __XSCALE__
! 48:
! 49: /* #define BIG_LOOPS */
! 50:
! 51: /*
! 52: * bcopy_page(src, dest)
! 53: *
! 54: * Optimised copy page routine.
! 55: *
! 56: * On entry:
! 57: * r0 - src address
! 58: * r1 - dest address
! 59: *
! 60: * Requires:
! 61: * number of bytes per page (PAGE_SIZE) is a multiple of 512 (BIG_LOOPS), 128
! 62: * otherwise.
! 63: */
! 64:
! 65: #define CHUNK_SIZE 32
! 66:
! 67: #define PREFETCH_FIRST_CHUNK /* nothing */
! 68: #define PREFETCH_NEXT_CHUNK /* nothing */
! 69:
! 70: #ifndef COPY_CHUNK
! 71: #define COPY_CHUNK \
! 72: PREFETCH_NEXT_CHUNK ; \
! 73: ldmia r0!, {r3-r8,ip,lr} ; \
! 74: stmia r1!, {r3-r8,ip,lr}
! 75: #endif /* ! COPY_CHUNK */
! 76:
! 77: #ifndef SAVE_REGS
! 78: #define SAVE_REGS stmfd sp!, {r4-r8, lr}
! 79: #define RESTORE_REGS ldmfd sp!, {r4-r8, pc}
! 80: #endif
! 81:
! 82: ENTRY(bcopy_page)
! 83: PREFETCH_FIRST_CHUNK
! 84: SAVE_REGS
! 85: #ifdef BIG_LOOPS
! 86: mov r2, #(PAGE_SIZE >> 9)
! 87: #else
! 88: mov r2, #(PAGE_SIZE >> 7)
! 89: #endif
! 90:
! 91: 1:
! 92: COPY_CHUNK
! 93: COPY_CHUNK
! 94: COPY_CHUNK
! 95: COPY_CHUNK
! 96:
! 97: #ifdef BIG_LOOPS
! 98: /* There is little point making the loop any larger; unless we are
! 99: running with the cache off, the load/store overheads will
! 100: completely dominate this loop. */
! 101: COPY_CHUNK
! 102: COPY_CHUNK
! 103: COPY_CHUNK
! 104: COPY_CHUNK
! 105:
! 106: COPY_CHUNK
! 107: COPY_CHUNK
! 108: COPY_CHUNK
! 109: COPY_CHUNK
! 110:
! 111: COPY_CHUNK
! 112: COPY_CHUNK
! 113: COPY_CHUNK
! 114: COPY_CHUNK
! 115: #endif
! 116: subs r2, r2, #1
! 117: bne 1b
! 118:
! 119: RESTORE_REGS /* ...and return. */
! 120:
! 121: /*
! 122: * bzero_page(dest)
! 123: *
! 124: * Optimised zero page routine.
! 125: *
! 126: * On entry:
! 127: * r0 - dest address
! 128: *
! 129: * Requires:
! 130: * number of bytes per page (PAGE_SIZE) is a multiple of 512 (BIG_LOOPS), 128
! 131: * otherwise
! 132: */
! 133:
! 134: ENTRY(bzero_page)
! 135: stmfd sp!, {r4-r8, lr}
! 136: #ifdef BIG_LOOPS
! 137: mov r2, #(PAGE_SIZE >> 9)
! 138: #else
! 139: mov r2, #(PAGE_SIZE >> 7)
! 140: #endif
! 141: mov r3, #0
! 142: mov r4, #0
! 143: mov r5, #0
! 144: mov r6, #0
! 145: mov r7, #0
! 146: mov r8, #0
! 147: mov ip, #0
! 148: mov lr, #0
! 149:
! 150: 1:
! 151: stmia r0!, {r3-r8,ip,lr}
! 152: stmia r0!, {r3-r8,ip,lr}
! 153: stmia r0!, {r3-r8,ip,lr}
! 154: stmia r0!, {r3-r8,ip,lr}
! 155:
! 156: #ifdef BIG_LOOPS
! 157: /* There is little point making the loop any larger; unless we are
! 158: running with the cache off, the load/store overheads will
! 159: completely dominate this loop. */
! 160: stmia r0!, {r3-r8,ip,lr}
! 161: stmia r0!, {r3-r8,ip,lr}
! 162: stmia r0!, {r3-r8,ip,lr}
! 163: stmia r0!, {r3-r8,ip,lr}
! 164:
! 165: stmia r0!, {r3-r8,ip,lr}
! 166: stmia r0!, {r3-r8,ip,lr}
! 167: stmia r0!, {r3-r8,ip,lr}
! 168: stmia r0!, {r3-r8,ip,lr}
! 169:
! 170: stmia r0!, {r3-r8,ip,lr}
! 171: stmia r0!, {r3-r8,ip,lr}
! 172: stmia r0!, {r3-r8,ip,lr}
! 173: stmia r0!, {r3-r8,ip,lr}
! 174:
! 175: #endif
! 176:
! 177: subs r2, r2, #1
! 178: bne 1b
! 179:
! 180: ldmfd sp!, {r4-r8, pc}
! 181:
! 182: #else /* __XSCALE__ */
! 183:
! 184: /*
! 185: * XSCALE version of bcopy_page
! 186: */
! 187: ENTRY(bcopy_page)
! 188: pld [r0]
! 189: stmfd sp!, {r4, r5}
! 190: mov ip, #32
! 191: ldr r2, [r0], #0x04 /* 0x00 */
! 192: ldr r3, [r0], #0x04 /* 0x04 */
! 193: 1: pld [r0, #0x18] /* Prefetch 0x20 */
! 194: ldr r4, [r0], #0x04 /* 0x08 */
! 195: ldr r5, [r0], #0x04 /* 0x0c */
! 196: strd r2, [r1], #0x08
! 197: ldr r2, [r0], #0x04 /* 0x10 */
! 198: ldr r3, [r0], #0x04 /* 0x14 */
! 199: strd r4, [r1], #0x08
! 200: ldr r4, [r0], #0x04 /* 0x18 */
! 201: ldr r5, [r0], #0x04 /* 0x1c */
! 202: strd r2, [r1], #0x08
! 203: ldr r2, [r0], #0x04 /* 0x20 */
! 204: ldr r3, [r0], #0x04 /* 0x24 */
! 205: pld [r0, #0x18] /* Prefetch 0x40 */
! 206: strd r4, [r1], #0x08
! 207: ldr r4, [r0], #0x04 /* 0x28 */
! 208: ldr r5, [r0], #0x04 /* 0x2c */
! 209: strd r2, [r1], #0x08
! 210: ldr r2, [r0], #0x04 /* 0x30 */
! 211: ldr r3, [r0], #0x04 /* 0x34 */
! 212: strd r4, [r1], #0x08
! 213: ldr r4, [r0], #0x04 /* 0x38 */
! 214: ldr r5, [r0], #0x04 /* 0x3c */
! 215: strd r2, [r1], #0x08
! 216: ldr r2, [r0], #0x04 /* 0x40 */
! 217: ldr r3, [r0], #0x04 /* 0x44 */
! 218: pld [r0, #0x18] /* Prefetch 0x60 */
! 219: strd r4, [r1], #0x08
! 220: ldr r4, [r0], #0x04 /* 0x48 */
! 221: ldr r5, [r0], #0x04 /* 0x4c */
! 222: strd r2, [r1], #0x08
! 223: ldr r2, [r0], #0x04 /* 0x50 */
! 224: ldr r3, [r0], #0x04 /* 0x54 */
! 225: strd r4, [r1], #0x08
! 226: ldr r4, [r0], #0x04 /* 0x58 */
! 227: ldr r5, [r0], #0x04 /* 0x5c */
! 228: strd r2, [r1], #0x08
! 229: ldr r2, [r0], #0x04 /* 0x60 */
! 230: ldr r3, [r0], #0x04 /* 0x64 */
! 231: pld [r0, #0x18] /* Prefetch 0x80 */
! 232: strd r4, [r1], #0x08
! 233: ldr r4, [r0], #0x04 /* 0x68 */
! 234: ldr r5, [r0], #0x04 /* 0x6c */
! 235: strd r2, [r1], #0x08
! 236: ldr r2, [r0], #0x04 /* 0x70 */
! 237: ldr r3, [r0], #0x04 /* 0x74 */
! 238: strd r4, [r1], #0x08
! 239: ldr r4, [r0], #0x04 /* 0x78 */
! 240: ldr r5, [r0], #0x04 /* 0x7c */
! 241: strd r2, [r1], #0x08
! 242: subs ip, ip, #0x01
! 243: ldrgt r2, [r0], #0x04 /* 0x80 */
! 244: ldrgt r3, [r0], #0x04 /* 0x84 */
! 245: strd r4, [r1], #0x08
! 246: bgt 1b
! 247: ldmfd sp!, {r4, r5}
! 248: mov pc, lr
! 249:
! 250: /*
! 251: * XSCALE version of bzero_page
! 252: */
! 253: ENTRY(bzero_page)
! 254: mov r1, #PAGE_SIZE
! 255: mov r2, #0
! 256: mov r3, #0
! 257: 1: strd r2, [r0], #8 /* 32 */
! 258: strd r2, [r0], #8
! 259: strd r2, [r0], #8
! 260: strd r2, [r0], #8
! 261: strd r2, [r0], #8 /* 64 */
! 262: strd r2, [r0], #8
! 263: strd r2, [r0], #8
! 264: strd r2, [r0], #8
! 265: strd r2, [r0], #8 /* 96 */
! 266: strd r2, [r0], #8
! 267: strd r2, [r0], #8
! 268: strd r2, [r0], #8
! 269: strd r2, [r0], #8 /* 128 */
! 270: strd r2, [r0], #8
! 271: strd r2, [r0], #8
! 272: strd r2, [r0], #8
! 273: subs r1, r1, #128
! 274: bne 1b
! 275: mov pc, lr
! 276: #endif /* __XSCALE__ */
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