1b2441318SGreg Kroah-Hartman/* SPDX-License-Identifier: GPL-2.0 */ 288278ca2SAdrian Bunk/* 31da177e4SLinus Torvalds * blockops.S: Common block zero optimized routines. 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) 61da177e4SLinus Torvalds */ 71da177e4SLinus Torvalds 8*4cdb71b6SMasahiro Yamada#include <linux/export.h> 98695c37dSDavid S. Miller#include <linux/linkage.h> 101da177e4SLinus Torvalds#include <asm/page.h> 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds /* Zero out 64 bytes of memory at (buf + offset). 131da177e4SLinus Torvalds * Assumes %g1 contains zero. 141da177e4SLinus Torvalds */ 151da177e4SLinus Torvalds#define BLAST_BLOCK(buf, offset) \ 161da177e4SLinus Torvalds std %g0, [buf + offset + 0x38]; \ 171da177e4SLinus Torvalds std %g0, [buf + offset + 0x30]; \ 181da177e4SLinus Torvalds std %g0, [buf + offset + 0x28]; \ 191da177e4SLinus Torvalds std %g0, [buf + offset + 0x20]; \ 201da177e4SLinus Torvalds std %g0, [buf + offset + 0x18]; \ 211da177e4SLinus Torvalds std %g0, [buf + offset + 0x10]; \ 221da177e4SLinus Torvalds std %g0, [buf + offset + 0x08]; \ 231da177e4SLinus Torvalds std %g0, [buf + offset + 0x00]; 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds /* Copy 32 bytes of memory at (src + offset) to 261da177e4SLinus Torvalds * (dst + offset). 271da177e4SLinus Torvalds */ 281da177e4SLinus Torvalds#define MIRROR_BLOCK(dst, src, offset, t0, t1, t2, t3, t4, t5, t6, t7) \ 291da177e4SLinus Torvalds ldd [src + offset + 0x18], t0; \ 301da177e4SLinus Torvalds ldd [src + offset + 0x10], t2; \ 311da177e4SLinus Torvalds ldd [src + offset + 0x08], t4; \ 321da177e4SLinus Torvalds ldd [src + offset + 0x00], t6; \ 331da177e4SLinus Torvalds std t0, [dst + offset + 0x18]; \ 341da177e4SLinus Torvalds std t2, [dst + offset + 0x10]; \ 351da177e4SLinus Torvalds std t4, [dst + offset + 0x08]; \ 361da177e4SLinus Torvalds std t6, [dst + offset + 0x00]; 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds /* Profiling evidence indicates that memset() is 391da177e4SLinus Torvalds * commonly called for blocks of size PAGE_SIZE, 401da177e4SLinus Torvalds * and (2 * PAGE_SIZE) (for kernel stacks) 411da177e4SLinus Torvalds * and with a second arg of zero. We assume in 421da177e4SLinus Torvalds * all of these cases that the buffer is aligned 431da177e4SLinus Torvalds * on at least an 8 byte boundary. 441da177e4SLinus Torvalds * 451da177e4SLinus Torvalds * Therefore we special case them to make them 461da177e4SLinus Torvalds * as fast as possible. 471da177e4SLinus Torvalds */ 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds .text 508695c37dSDavid S. MillerENTRY(bzero_1page) 511da177e4SLinus Torvalds/* NOTE: If you change the number of insns of this routine, please check 521da177e4SLinus Torvalds * arch/sparc/mm/hypersparc.S */ 531da177e4SLinus Torvalds /* %o0 = buf */ 541da177e4SLinus Torvalds or %g0, %g0, %g1 551da177e4SLinus Torvalds or %o0, %g0, %o1 561da177e4SLinus Torvalds or %g0, (PAGE_SIZE >> 8), %g2 571da177e4SLinus Torvalds1: 581da177e4SLinus Torvalds BLAST_BLOCK(%o0, 0x00) 591da177e4SLinus Torvalds BLAST_BLOCK(%o0, 0x40) 601da177e4SLinus Torvalds BLAST_BLOCK(%o0, 0x80) 611da177e4SLinus Torvalds BLAST_BLOCK(%o0, 0xc0) 621da177e4SLinus Torvalds subcc %g2, 1, %g2 631da177e4SLinus Torvalds bne 1b 641da177e4SLinus Torvalds add %o0, 0x100, %o0 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds retl 671da177e4SLinus Torvalds nop 688695c37dSDavid S. MillerENDPROC(bzero_1page) 69d3867f04SAl ViroEXPORT_SYMBOL(bzero_1page) 701da177e4SLinus Torvalds 718695c37dSDavid S. MillerENTRY(__copy_1page) 721da177e4SLinus Torvalds/* NOTE: If you change the number of insns of this routine, please check 731da177e4SLinus Torvalds * arch/sparc/mm/hypersparc.S */ 741da177e4SLinus Torvalds /* %o0 = dst, %o1 = src */ 751da177e4SLinus Torvalds or %g0, (PAGE_SIZE >> 8), %g1 761da177e4SLinus Torvalds1: 771da177e4SLinus Torvalds MIRROR_BLOCK(%o0, %o1, 0x00, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 781da177e4SLinus Torvalds MIRROR_BLOCK(%o0, %o1, 0x20, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 791da177e4SLinus Torvalds MIRROR_BLOCK(%o0, %o1, 0x40, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 801da177e4SLinus Torvalds MIRROR_BLOCK(%o0, %o1, 0x60, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 811da177e4SLinus Torvalds MIRROR_BLOCK(%o0, %o1, 0x80, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 821da177e4SLinus Torvalds MIRROR_BLOCK(%o0, %o1, 0xa0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 831da177e4SLinus Torvalds MIRROR_BLOCK(%o0, %o1, 0xc0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 841da177e4SLinus Torvalds MIRROR_BLOCK(%o0, %o1, 0xe0, %o2, %o3, %o4, %o5, %g2, %g3, %g4, %g5) 851da177e4SLinus Torvalds subcc %g1, 1, %g1 861da177e4SLinus Torvalds add %o0, 0x100, %o0 871da177e4SLinus Torvalds bne 1b 881da177e4SLinus Torvalds add %o1, 0x100, %o1 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds retl 911da177e4SLinus Torvalds nop 928695c37dSDavid S. MillerENDPROC(__copy_1page) 93d3867f04SAl ViroEXPORT_SYMBOL(__copy_1page) 94