| 1 | /* |
| 2 | * ========== Copyright Header Begin ========================================== |
| 3 | * |
| 4 | * OpenSPARC T2 Processor File: barrier_subr_v9.s |
| 5 | * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. |
| 6 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES. |
| 7 | * |
| 8 | * The above named program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public |
| 10 | * License version 2 as published by the Free Software Foundation. |
| 11 | * |
| 12 | * The above named program is distributed in the hope that it will be |
| 13 | * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public |
| 18 | * License along with this work; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. |
| 20 | * |
| 21 | * ========== Copyright Header End ============================================ |
| 22 | */ |
| 23 | #ifdef ARCH_X64 |
| 24 | |
| 25 | /* |
| 26 | * void barrier(uint32_t loopticks) |
| 27 | * Hmm, this function is not used anymore and should be deleted. |
| 28 | * In fact, the following files should be deleted: |
| 29 | * system/util/barrier_subr_v9.s |
| 30 | * system/util/barrier_subr_v8.s |
| 31 | * system/util/include/barrier.h |
| 32 | * system/util/barrier.cc |
| 33 | * and all references to cpu_barrier |
| 34 | */ |
| 35 | |
| 36 | #else |
| 37 | |
| 38 | #pragma ident "@(#)1.3 07/07/10 barrier_subr_v9.s" |
| 39 | |
| 40 | #include <sys/asm_linkage.h> |
| 41 | |
| 42 | #if 0 |
| 43 | |
| 44 | ENTRY(barrier) |
| 45 | ldx [%o0+24], %o1 ! load bp->sbp into %o1 |
| 46 | |
| 47 | ! atomic decrement of running count |
| 48 | add %o1, 4, %o2 |
| 49 | retry: ld [%o2], %o3 |
| 50 | add %o3, -1, %o4 |
| 51 | cas [%o2], %o3, %o4 |
| 52 | cmp %o3, %o4 |
| 53 | bne retry |
| 54 | nop |
| 55 | |
| 56 | ! check if this is the last one |
| 57 | cmp %o3, 1 |
| 58 | bne wait |
| 59 | nop |
| 60 | |
| 61 | ! YES, switch sub-barriers, reset count and CV |
| 62 | add %o0, 4, %o2 ! %o2 = &bp->sb[0] |
| 63 | cmp %o1, %o2 |
| 64 | bne 1f |
| 65 | nop |
| 66 | add %o0, 12, %o2 ! %o2 = &bp->sb[1] |
| 67 | 1: stx %o2, [%o0 + 24] ! store %o2 into bp->sbp |
| 68 | set 1, %o4 |
| 69 | st %o4, [%o2] |
| 70 | ld [%o0], %o3 |
| 71 | st %o3, [%o2 + 4] |
| 72 | |
| 73 | ! release the CV busy-waiters |
| 74 | retl |
| 75 | clr [%o1] |
| 76 | |
| 77 | ! NO, busy-wait on CV |
| 78 | wait: ld [%o1], %o2 |
| 79 | tst %o2 |
| 80 | bne wait |
| 81 | nop |
| 82 | retl |
| 83 | nop |
| 84 | SET_SIZE(barrier) |
| 85 | |
| 86 | #else |
| 87 | |
| 88 | .global cpu_barrier |
| 89 | ENTRY(barrier) |
| 90 | or %o0, 0, %o5 ! loopticks |
| 91 | setx cpu_barrier, %o2, %o0 |
| 92 | ldx [%o0 + 24], %o1 ! load bp->sbp into %o1 |
| 93 | ldx [%o0 + 32], %o0 !!!!!! global tick pointer |
| 94 | |
| 95 | ! atomic decrement of running count |
| 96 | add %o1, 4, %o2 |
| 97 | retry: ld [%o2], %o3 |
| 98 | add %o3, -1, %o4 |
| 99 | cas [%o2], %o3, %o4 |
| 100 | cmp %o3, %o4 |
| 101 | bne retry |
| 102 | nop |
| 103 | |
| 104 | retry1: ldx [%o0], %o2 !! global_tick + looptick |
| 105 | add %o2, %o5, %o4 !! |
| 106 | casx [%o0], %o2, %o4 !! |
| 107 | cmp %o2, %o4 !! |
| 108 | bne,pn %xcc, retry1 |
| 109 | nop !! |
| 110 | |
| 111 | ! check if this is the last one |
| 112 | cmp %o3, 1 |
| 113 | bne wait |
| 114 | nop |
| 115 | |
| 116 | ! YES, switch sub-barriers, reset count and CV |
| 117 | setx cpu_barrier, %o2, %o0 |
| 118 | add %o0, 4, %o2 ! %o2 = &bp->sb[0] |
| 119 | cmp %o1, %o2 |
| 120 | bne 1f |
| 121 | nop |
| 122 | add %o0, 12, %o2 ! %o2 = &bp->sb[1] |
| 123 | 1: stx %o2, [%o0 + 24] ! store %o2 into bp->sbp |
| 124 | set 1, %o4 |
| 125 | st %o4, [%o2] |
| 126 | ld [%o0], %o3 |
| 127 | st %o3, [%o2 + 4] |
| 128 | |
| 129 | ! release the CV busy-waiters |
| 130 | retl |
| 131 | clr [%o1] |
| 132 | |
| 133 | ! NO, busy-wait on CV |
| 134 | wait: ld [%o1], %o2 |
| 135 | tst %o2 |
| 136 | bne wait |
| 137 | nop |
| 138 | retl |
| 139 | nop |
| 140 | SET_SIZE(barrier) |
| 141 | |
| 142 | #endif |
| 143 | |
| 144 | |
| 145 | #endif |