1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27/ 28/ Inline functions for i386 kernels. 29/ Shared between all x86 platform variants. 30/ 31 32/ 33/ return current thread pointer 34/ 35/ NOTE: the "0x10" should be replaced by the computed value of the 36/ offset of "cpu_thread" from the beginning of the struct cpu. 37/ Including "assym.h" does not work, however, since that stuff 38/ is PSM-specific and is only visible to the 'unix' build anyway. 39/ Same with current cpu pointer, where "0xc" should be replaced 40/ by the computed value of the offset of "cpu_self". 41/ Ugh -- what a disaster. 42/ 43 .inline threadp,0 44 movl %gs:0x10, %eax 45 .end 46 47/ 48/ return current cpu pointer 49/ 50 .inline curcpup,0 51 movl %gs:0xc, %eax 52 .end 53 54/ 55/ return caller 56/ 57 .inline caller,0 58 movl 4(%ebp), %eax 59 .end 60 61/ 62/ convert ipl to spl. This is the identity function for i86 63/ 64 .inline ipltospl,0 65 movl (%esp), %eax 66 .end 67 68/ 69/ find the low order bit in a word 70/ 71 .inline lowbit,4 72 movl $-1, %eax 73 bsfl (%esp), %eax 74 incl %eax 75 .end 76 77/ 78/ find the high order bit in a word 79/ 80 .inline highbit,4 81 movl $-1, %eax 82 bsrl (%esp), %eax 83 incl %eax 84 .end 85 86/ 87/ Networking byte order functions (too bad, Intel has the wrong byte order) 88/ 89 .inline htonll,4 90 movl (%esp), %edx 91 movl 4(%esp), %eax 92 bswap %edx 93 bswap %eax 94 .end 95 96 .inline ntohll,4 97 movl (%esp), %edx 98 movl 4(%esp), %eax 99 bswap %edx 100 bswap %eax 101 .end 102 103 .inline htonl,4 104 movl (%esp), %eax 105 bswap %eax 106 .end 107 108 .inline ntohl,4 109 movl (%esp), %eax 110 bswap %eax 111 .end 112 113 .inline htons,4 114 movl (%esp), %eax 115 bswap %eax 116 shrl $16, %eax 117 .end 118 119 .inline ntohs,4 120 movl (%esp), %eax 121 bswap %eax 122 shrl $16, %eax 123 .end 124 125/* 126 * multiply two long numbers and yield a u_longlong_t result 127 * Provided to manipulate hrtime_t values. 128 */ 129 .inline mul32, 8 130 movl 4(%esp), %eax 131 movl (%esp), %ecx 132 mull %ecx 133 .end 134 135/* 136 * Unlock hres_lock and increment the count value. (See clock.h) 137 */ 138 .inline unlock_hres_lock, 0 139 lock 140 incl hres_lock 141 .end 142 143 .inline atomic_orb,8 144 movl (%esp), %eax 145 movl 4(%esp), %edx 146 lock 147 orb %dl,(%eax) 148 .end 149 150 .inline atomic_andb,8 151 movl (%esp), %eax 152 movl 4(%esp), %edx 153 lock 154 andb %dl,(%eax) 155 .end 156 157/* 158 * atomic inc/dec operations. 159 * void atomic_inc16(uint16_t *addr) { ++*addr; } 160 * void atomic_dec16(uint16_t *addr) { --*addr; } 161 */ 162 .inline atomic_inc16,4 163 movl (%esp), %eax 164 lock 165 incw (%eax) 166 .end 167 168 .inline atomic_dec16,4 169 movl (%esp), %eax 170 lock 171 decw (%eax) 172 .end 173 174/* 175 * Call the pause instruction. To the Pentium 4 Xeon processor, it acts as 176 * a hint that the code sequence is a busy spin-wait loop. Without a pause 177 * instruction in these loops, the P4 Xeon processor may suffer a severe 178 * penalty when exiting the loop because the processor detects a possible 179 * memory violation. Inserting the pause instruction significantly reduces 180 * the likelihood of a memory order violation, improving performance. 181 * The pause instruction is a NOP on all other IA-32 processors. 182 */ 183 .inline ht_pause, 0 184 rep / our compiler doesn't support "pause" yet, 185 nop / so we're using "F3 90" opcode directly 186 .end 187 188/ 189/ prefetch 64 bytes 190/ prefetch is an SSE extension which is not supported on older 32-bit processors 191/ so define this as a no-op for now 192/ 193 .inline prefetch64,4 194/ movl (%esp), %eax 195/ prefetcht0 (%eax) 196/ prefetcht0 32(%eax) 197 .end 198