/* * Copyright (c) 2003 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ #include <sys/appleapiopts.h> #include <ppc/asm.h> #include <machine/cpu_capabilities.h> #include <machine/commpage.h> /* * WARNING: this code is written for 32-bit mode, and ported by the kernel if necessary * to 64-bit mode for use in the 64-bit commpage. This "port" consists of the following * simple transformations: * - all word compares are changed to doubleword * - all "srwi[.]" opcodes are changed to "srdi[.]" * Nothing else is done. For this to work, the following rules must be * carefully followed: * - do not use carry or overflow * - only use record mode if you are sure the results are mode-invariant * for example, all "andi." and almost all "rlwinm." are fine * - do not use "slwi", "slw", or "srw" * An imaginative programmer could break the porting model in other ways, but the above * are the most likely problem areas. It is perhaps surprising how well in practice * this simple method works. */ .text .align 2 /* ********************* * * M E M S E T _ 6 4 * * ********************* * * This is a subroutine called by Libc memset and _memset_pattern for large nonzero * operands (zero operands are funneled into bzero.) This version is for a * hypothetic processor that is 64-bit but not Altivec. * It is not optimized, since it would only be used during bringup. * * Registers at entry: * r4 = count of bytes to store (must be >= 32) * r8 = ptr to the 1st byte to store (16-byte aligned) * r9 = ptr to 16-byte pattern to store (16-byte aligned) * When we return: * r3 = not changed, since memset returns it * r4 = bytes remaining to store (will be <32) * r7 = not changed * r8 = ptr to next byte to store (still 16-byte aligned) * r12 = not changed (holds return value for memset) */ memset_64: srwi r0,r4,5 // get number of 32-byte chunks (>0) ld r10,0(r9) // load pattern ld r11,8(r9) rlwinm r4,r4,0,0x1F // mask down count mtctr r0 // set up loop count // Loop over 32-byte chunks. 1: std r10,0(r8) std r11,8(r8) std r10,16(r8) std r11,24(r8) addi r8,r8,32 bdnz++ 1b blr COMMPAGE_DESCRIPTOR(memset_64,_COMM_PAGE_MEMSET_PATTERN,k64Bit,kHasAltivec, \ kCommPageBoth+kPort32to64)