| 1 | /* |
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| 2 | * boot_utils.c - TSAR bootloader utilities implementation. |
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| 3 | * |
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| 4 | * Authors : Alain Greiner / Vu Son (2016) |
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| 5 | * |
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| 6 | * Copyright (c) UPMC Sorbonne Universites |
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| 7 | * |
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| 8 | * This file is part of ALMOS-MKH. |
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| 9 | * |
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| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 11 | * under the terms of the GNU General Public License as published by |
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| 12 | * the Free Software Foundation; version 2.0 of the License. |
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| 13 | * |
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| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 17 | * General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 22 | */ |
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| 23 | |
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| 24 | #include <stdarg.h> |
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| 25 | |
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| 26 | #include <boot_tty_driver.h> |
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| 27 | #include <hal_types.h> |
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| 28 | #include <boot_utils.h> |
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| 29 | |
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| 30 | |
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| 31 | /**************************************************************************** |
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| 32 | * Global variables * |
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| 33 | ****************************************************************************/ |
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| 34 | |
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| 35 | extern boot_remote_spinlock_t tty0_lock; // allocated in boot.c |
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| 36 | |
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| 37 | /**************************************************************************** |
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| 38 | * Remote accesses. * |
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| 39 | ****************************************************************************/ |
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| 40 | |
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| 41 | ////////////////////////////////// |
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| 42 | uint32_t boot_remote_lw(xptr_t xp) |
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| 43 | { |
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| 44 | uint32_t res; |
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| 45 | uint32_t ptr; |
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| 46 | uint32_t cxy; |
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| 47 | |
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| 48 | // Extracting information from the extended pointer |
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| 49 | ptr = (uint32_t)GET_PTR(xp); |
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| 50 | cxy = (uint32_t)GET_CXY(xp); |
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| 51 | |
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| 52 | // Assembly instructions to get the work done. |
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| 53 | asm volatile("mfc2 $15, $24\n" /* $15 <= CP2_DATA_PADDR_EXT */ |
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| 54 | "mtc2 %2, $24\n" /* CP2_DATA_PADDR_EXT <= cxy */ |
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| 55 | "lw %0, 0(%1)\n" /* *ptr <= data */ |
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| 56 | "mtc2 $15, $24\n" /* CP2_DATA_PADDR_EXT <= $15 */ |
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| 57 | "sync \n" |
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| 58 | : "=&r"(res) /* Temporary register so that it |
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| 59 | doesn't overlap the other inputs |
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| 60 | or outputs. */ |
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| 61 | : "r"(ptr), "r"(cxy) |
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| 62 | : "$15" |
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| 63 | ); |
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| 64 | |
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| 65 | return res; |
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| 66 | |
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| 67 | } // boot_remote_lw() |
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| 68 | |
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| 69 | ///////////////////////////////////////////// |
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| 70 | void boot_remote_sw(xptr_t xp, uint32_t data) |
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| 71 | { |
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| 72 | uint32_t ptr; /* Classic pointer to the distant memory location. */ |
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| 73 | uint32_t cxy; /* Identifier of the cluster containing the distant |
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| 74 | memory location. */ |
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| 75 | |
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| 76 | /* Extracting information from the extended pointers. */ |
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| 77 | ptr = (uint32_t)GET_PTR(xp); |
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| 78 | cxy = (uint32_t)GET_CXY(xp); |
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| 79 | |
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| 80 | /* Assembly instructions to get the work done. */ |
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| 81 | asm volatile("mfc2 $15, $24\n" /* $15 <= CP2_DATA_PADDR_EXT */ |
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| 82 | "mtc2 %2, $24\n" /* CP2_DATA_PADDR_EXT <= cxy */ |
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| 83 | "sw %0, 0(%1)\n" /* *ptr <= data */ |
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| 84 | "mtc2 $15, $24\n" /* CP2_DATA_PADDR_EXT <= $15 */ |
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| 85 | "sync \n" |
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| 86 | : |
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| 87 | : "r"(data), "r"(ptr), "r"(cxy) |
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| 88 | : "$15", "memory" |
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| 89 | ); |
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| 90 | |
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| 91 | } // boot_remote_sw() |
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| 92 | |
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| 93 | ////////////////////////////////////////////////////// |
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| 94 | int32_t boot_remote_atomic_add(xptr_t xp, int32_t val) |
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| 95 | { |
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| 96 | int32_t res; /* Value stored at the distant memory location before |
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| 97 | the atomic operation. */ |
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| 98 | uint32_t ptr; /* Classic pointer to the distant memory location. */ |
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| 99 | uint32_t cxy; /* Identifier of the cluster containing the distant |
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| 100 | memory location. */ |
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| 101 | |
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| 102 | /* Extracting information from the extended pointers. */ |
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| 103 | ptr = (uint32_t)GET_PTR(xp); |
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| 104 | cxy = (uint32_t)GET_CXY(xp); |
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| 105 | |
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| 106 | /* Assembly instructions to get the work done. */ |
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| 107 | asm volatile("mfc2 $15, $24 \n" /* $15 <= CP2_DATA_PADDR_EXT */ |
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| 108 | "mtc2 %3, $24 \n" /* CP2_DATA_PADDR_EXT <= cxy */ |
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| 109 | "1: \n" |
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| 110 | "ll %0, 0(%1) \n" /* res <= *ptr */ |
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| 111 | "addu $3, %0, %2\n" /* $3 <= res + val */ |
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| 112 | "sc $3, 0(%1) \n" /* *ptr <= $3 */ |
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| 113 | "beq $3, $0, 1b\n" /* Retry until success. */ |
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| 114 | "nop \n" /* Delayed slot. */ |
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| 115 | "mtc2 $15, $24 \n" /* CP2_DATA_PADDR_EXT <= $15 */ |
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| 116 | "sync \n" |
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| 117 | : "=&r"(res) /* Temporary register so that |
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| 118 | it doesn't overlap the other |
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| 119 | inputs or outputs. */ |
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| 120 | : "r"(ptr), "r"(val), "r"(cxy) |
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| 121 | : "$3", "$15", "memory" |
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| 122 | ); |
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| 123 | |
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| 124 | return res; |
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| 125 | |
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| 126 | } // boot_remote_atomic_add() |
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| 127 | |
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| 128 | /////////////////////////////////////////////////////////////// |
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| 129 | void boot_remote_memcpy(xptr_t dest, xptr_t src, uint32_t size) |
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| 130 | { |
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| 131 | uint32_t words_nr; /* Number of 32-bit words to be copied. */ |
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| 132 | uint32_t dptr; /* Classic pointer to the destination buffer. */ |
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| 133 | uint32_t dcxy; /* Identifier of the cluster containing the |
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| 134 | destination buffer. */ |
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| 135 | uint32_t sptr; /* Classic pointer to the source buffer. */ |
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| 136 | uint32_t scxy; /* Identifier of the cluster containing the |
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| 137 | source buffer. */ |
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| 138 | uint32_t i; /* Iterator for memory copying loop. */ |
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| 139 | |
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| 140 | /* Extracting information from the extended pointers. */ |
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| 141 | dptr = (uint32_t)GET_PTR(dest); |
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| 142 | dcxy = (uint32_t)GET_CXY(dest); |
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| 143 | sptr = (uint32_t)GET_PTR(src); |
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| 144 | scxy = (uint32_t)GET_CXY(src); |
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| 145 | |
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| 146 | /* |
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| 147 | * Testing if we could perform word-by-word copy (if both addresses are |
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| 148 | * word-aligned). |
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| 149 | */ |
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| 150 | if ((dptr & 0x3) || (sptr & 0x3)) |
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| 151 | words_nr = 0; |
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| 152 | else |
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| 153 | words_nr = size >> 2; |
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| 154 | |
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| 155 | /* Copying word-by-word. */ |
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| 156 | for (i = 0; i < words_nr; i++) |
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| 157 | { |
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| 158 | asm volatile("mfc2 $15, $24\n" /* $15 <= CP2_DATA_PADDR_EXT */ |
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| 159 | "mtc2 %0, $24\n" /* CP2_DATA_PADDR_EXT <= scxy */ |
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| 160 | "lw $3, 0(%1)\n" /* $3 <= *(sptr + 4*i) */ |
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| 161 | "mtc2 %2, $24\n" /* CP2_DATA_PADDR_EXT <= dcxy */ |
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| 162 | "sw $3, 0(%3)\n" /* *(dptr + 4*i) <= $3 */ |
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| 163 | "mtc2 $15, $24\n" /* CP2_DATA_PADDR_EXT <= $15 */ |
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| 164 | "sync \n" |
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| 165 | : |
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| 166 | : "r"(scxy), "r"(sptr + (i << 2)), |
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| 167 | "r"(dcxy), "r"(dptr + (i << 2)) |
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| 168 | : "$3", "$15", "memory" |
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| 169 | ); |
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| 170 | } |
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| 171 | |
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| 172 | /* Copying byte-by-byte if there is any left. */ |
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| 173 | for (i = words_nr << 2; i < size; i++) |
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| 174 | { |
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| 175 | asm volatile("mfc2 $15, $24\n" /* $15 <= CP2_DATA_PADDR_EXT */ |
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| 176 | "mtc2 %0, $24\n" /* CP2_DATA_PADDR_EXT <= scxy */ |
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| 177 | "lb $3, 0(%1)\n" /* $3 <= *(sptr + i) */ |
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| 178 | "mtc2 %2, $24\n" /* CP2_DATA_PADDR_EXT <= dcxy */ |
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| 179 | "sb $3, 0(%3)\n" /* *(dptr + i) <= $3 */ |
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| 180 | "mtc2 $15, $24\n" /* CP2_DATA_PADDR_EXT <= $15 */ |
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| 181 | "sync \n" |
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| 182 | : |
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| 183 | : "r"(scxy), "r"(sptr + i), |
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| 184 | "r"(dcxy), "r"(dptr + i) |
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| 185 | : "$3", "$15", "memory" |
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| 186 | ); |
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| 187 | } |
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| 188 | |
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| 189 | } // boot_remote_memcpy() |
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| 190 | |
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| 191 | /**************************************************************************** |
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| 192 | * Atomic operations. * |
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| 193 | ****************************************************************************/ |
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| 194 | |
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| 195 | int32_t boot_atomic_add(int32_t* ptr, int32_t val) |
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| 196 | { |
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| 197 | int32_t res; /* Value of the variable before the atomic operation. */ |
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| 198 | |
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| 199 | asm volatile(".set noreorder \n" |
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| 200 | "1: \n" |
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| 201 | "ll %0, 0(%1) \n" /* res <= *ptr */ |
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| 202 | "addu $3, %0, %2\n" /* $3 <= res + val */ |
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| 203 | "sc $3, 0(%1) \n" /* $ptr <= $3 */ |
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| 204 | "beq $3, $0, 1b\n" /* Retry until success. */ |
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| 205 | "nop \n" |
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| 206 | "sync \n" |
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| 207 | ".set reorder \n" |
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| 208 | : "=&r"(res) /* Temporary register so that it |
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| 209 | doesn't overlap the other |
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| 210 | inputs or outputs. */ |
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| 211 | : "r"(ptr), "r"(val) |
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| 212 | : "$3", "memory" |
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| 213 | ); |
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| 214 | |
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| 215 | return res; |
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| 216 | |
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| 217 | } // boot_atomic_add() |
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| 218 | |
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| 219 | /**************************************************************************** |
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| 220 | * Memory functions. * |
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| 221 | ****************************************************************************/ |
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| 222 | |
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| 223 | /////////////////////////////////////////////////////// |
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| 224 | void boot_memcpy(void * dst, void * src, uint32_t size) |
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| 225 | { |
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| 226 | uint32_t * wdst = dst; |
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| 227 | uint32_t * wsrc = src; |
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| 228 | |
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| 229 | // word-by-word copy if both addresses are word-aligned |
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| 230 | if ( (((uint32_t)dst & 0x3) == 0) && (((uint32_t)src & 0x3) == 0) ) |
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| 231 | { |
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| 232 | while (size > 3) |
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| 233 | { |
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| 234 | *wdst++ = *wsrc++; |
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| 235 | size -= 4; |
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| 236 | } |
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| 237 | } |
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| 238 | |
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| 239 | unsigned char * cdst = (unsigned char *)wdst; |
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| 240 | unsigned char * csrc = (unsigned char *)wsrc; |
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| 241 | |
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| 242 | // byte-by-byte copy if: |
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| 243 | // - At least 1 of the 2 addresses is not word-aligned, |
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| 244 | // - 'size' value is not a multiple of 4 bytes. |
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| 245 | while (size) |
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| 246 | { |
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| 247 | *cdst++ = *csrc++; |
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| 248 | } |
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| 249 | } // boot_memcpy() |
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| 250 | |
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| 251 | //////////////////////////////////////////////////// |
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| 252 | void boot_memset(void * dst, int val, uint32_t size) |
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| 253 | { |
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| 254 | val &= 0xFF; |
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| 255 | |
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| 256 | // build a word-sized value |
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| 257 | uint32_t wval = (val << 24) | (val << 16) | (val << 8) | val; |
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| 258 | uint32_t * wdst = (uint32_t *)dst; |
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| 259 | |
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| 260 | // word per word if address aligned |
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| 261 | if (((uint32_t)dst & 0x3) == 0) |
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| 262 | { |
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| 263 | while (size > 3) |
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| 264 | { |
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| 265 | *wdst++ = wval; |
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| 266 | size -= 4; |
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| 267 | } |
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| 268 | } |
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| 269 | |
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| 270 | char * cdst = (char *)wdst; |
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| 271 | |
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| 272 | // byte per byte |
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| 273 | while (size--) |
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| 274 | { |
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| 275 | *cdst++ = (char)val; |
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| 276 | } |
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| 277 | } // boot_memset() |
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| 278 | |
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| 279 | /**************************************************************************** |
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| 280 | * String functions. * |
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| 281 | ****************************************************************************/ |
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| 282 | |
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| 283 | /////////////////////////////////////// |
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| 284 | void boot_strcpy(char* dest, char* src) |
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| 285 | { |
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| 286 | /* Checking if the arguments are correct. */ |
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| 287 | if ((dest == NULL) || (src == NULL)) |
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| 288 | return; |
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| 289 | |
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| 290 | /* Copying the string. */ |
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| 291 | while ((*dest++ = *src++) != '\0'); |
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| 292 | |
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| 293 | } // boot_strcpy() |
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| 294 | |
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| 295 | ///////////////////////////// |
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| 296 | uint32_t boot_strlen(char* s) |
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| 297 | { |
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| 298 | uint32_t res = 0; /* Length of the string (in bytes). */ |
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| 299 | |
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| 300 | if (s != NULL) |
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| 301 | { |
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| 302 | while (*s++ != '\0') |
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| 303 | res++; |
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| 304 | } |
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| 305 | |
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| 306 | return res; |
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| 307 | |
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| 308 | } // boot_strlen() |
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| 309 | |
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| 310 | /////////////////////////////////// |
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| 311 | int boot_strcmp(char* s1, char* s2) |
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| 312 | { |
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| 313 | if ((s1 == NULL) || (s2 == NULL)) |
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| 314 | return 0; |
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| 315 | |
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| 316 | while (1) |
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| 317 | { |
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| 318 | if (*s1 != *s2) |
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| 319 | return 1; |
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| 320 | if (*s1 == '\0') |
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| 321 | break; |
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| 322 | s1++; |
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| 323 | s2++; |
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| 324 | } |
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| 325 | |
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| 326 | return 0; |
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| 327 | |
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| 328 | } // boot_strcmp() |
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| 329 | |
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| 330 | /**************************************************************************** |
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| 331 | * Display functions. * |
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| 332 | ****************************************************************************/ |
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| 333 | |
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| 334 | ///////////////////////// |
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| 335 | void boot_puts(char* str) |
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| 336 | { |
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| 337 | boot_tty_write(str, boot_strlen(str)); |
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| 338 | |
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| 339 | } // boot_puts() |
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| 340 | |
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| 341 | /////////////////////////////////////// |
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| 342 | void boot_printf( char * format , ... ) |
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| 343 | { |
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| 344 | va_list args; |
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| 345 | va_start( args , format ); |
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| 346 | |
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| 347 | // take the lock protecting TTY0 |
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| 348 | boot_remote_lock( XPTR( 0 , &tty0_lock ) ); |
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| 349 | |
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| 350 | printf_text: |
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| 351 | |
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| 352 | while ( *format ) |
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| 353 | { |
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| 354 | uint32_t i; |
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| 355 | for (i = 0 ; format[i] && (format[i] != '%') ; i++); |
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| 356 | if (i) |
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| 357 | { |
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| 358 | boot_tty_write( format , i ); |
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| 359 | format += i; |
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| 360 | } |
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| 361 | if (*format == '%') |
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| 362 | { |
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| 363 | format++; |
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| 364 | goto printf_arguments; |
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| 365 | } |
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| 366 | } |
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| 367 | |
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| 368 | // release the lock |
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| 369 | boot_remote_unlock( XPTR( 0 , &tty0_lock ) ); |
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| 370 | |
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| 371 | va_end( args ); |
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| 372 | return; |
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| 373 | |
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| 374 | printf_arguments: |
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| 375 | |
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| 376 | { |
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| 377 | char buf[20]; |
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| 378 | char * pbuf = NULL; |
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| 379 | uint32_t len = 0; |
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| 380 | static const char HexaTab[] = "0123456789ABCDEF"; |
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| 381 | uint32_t i; |
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| 382 | |
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| 383 | switch (*format++) |
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| 384 | { |
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| 385 | case ('c'): /* char conversion */ |
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| 386 | { |
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| 387 | int val = va_arg( args , int ); |
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| 388 | len = 1; |
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| 389 | buf[0] = val; |
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| 390 | pbuf = &buf[0]; |
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| 391 | break; |
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| 392 | } |
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| 393 | case ('d'): /* 32 bits decimal signed */ |
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| 394 | { |
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| 395 | int val = va_arg( args , int ); |
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| 396 | if (val < 0) |
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| 397 | { |
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| 398 | val = -val; |
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| 399 | boot_tty_write( "-" , 1 ); |
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| 400 | } |
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| 401 | for(i = 0; i < 10; i++) |
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| 402 | { |
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| 403 | buf[9 - i] = HexaTab[val % 10]; |
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| 404 | if (!(val /= 10)) break; |
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| 405 | } |
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| 406 | len = i + 1; |
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| 407 | pbuf = &buf[9 - i]; |
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| 408 | break; |
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| 409 | } |
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| 410 | case ('u'): /* 32 bits decimal unsigned */ |
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| 411 | { |
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| 412 | uint32_t val = va_arg( args , uint32_t ); |
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| 413 | for(i = 0; i < 10; i++) |
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| 414 | { |
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| 415 | buf[9 - i] = HexaTab[val % 10]; |
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| 416 | if (!(val /= 10)) break; |
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| 417 | } |
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| 418 | len = i + 1; |
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| 419 | pbuf = &buf[9 - i]; |
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| 420 | break; |
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| 421 | } |
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| 422 | case ('x'): /* 32 bits hexadecimal unsigned */ |
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| 423 | { |
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| 424 | uint32_t val = va_arg( args , uint32_t ); |
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| 425 | boot_tty_write( "0x" , 2 ); |
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| 426 | for(i = 0; i < 8; i++) |
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| 427 | { |
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| 428 | buf[7 - i] = HexaTab[val & 0xF]; |
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| 429 | if (!(val = (val>>4))) break; |
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| 430 | } |
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| 431 | len = i + 1; |
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| 432 | pbuf = &buf[7 - i]; |
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| 433 | break; |
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| 434 | } |
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| 435 | case ('X'): /* 32 bits hexadecimal unsigned on 10 char */ |
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| 436 | { |
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| 437 | uint32_t val = va_arg( args , uint32_t ); |
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| 438 | boot_tty_write( "0x" , 2 ); |
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| 439 | for(i = 0; i < 8; i++) |
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| 440 | { |
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| 441 | buf[7 - i] = HexaTab[val & 0xF]; |
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| 442 | val = (val>>4); |
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| 443 | } |
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| 444 | len = 8; |
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| 445 | pbuf = buf; |
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| 446 | break; |
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| 447 | } |
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| 448 | case ('l'): /* 64 bits hexadecimal unsigned */ |
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| 449 | { |
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| 450 | uint64_t val = va_arg( args , uint64_t ); |
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| 451 | boot_tty_write( "0x" , 2 ); |
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| 452 | for(i = 0; i < 16; i++) |
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| 453 | { |
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| 454 | buf[15 - i] = HexaTab[val & 0xF]; |
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| 455 | if (!(val = (val>>4))) break; |
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| 456 | } |
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| 457 | len = i + 1; |
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| 458 | pbuf = &buf[15 - i]; |
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| 459 | break; |
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| 460 | } |
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| 461 | case ('L'): /* 64 bits hexadecimal unsigned on 18 char */ |
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| 462 | { |
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| 463 | uint64_t val = va_arg( args , uint64_t ); |
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| 464 | boot_tty_write( "0x" , 2 ); |
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| 465 | for(i = 0; i < 16; i++) |
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| 466 | { |
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| 467 | buf[15 - i] = HexaTab[val & 0xF]; |
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| 468 | val = (val>>4); |
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| 469 | } |
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| 470 | len = 16; |
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| 471 | pbuf = buf; |
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| 472 | break; |
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| 473 | } |
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| 474 | case ('s'): /* string */ |
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| 475 | { |
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| 476 | char* str = va_arg( args , char* ); |
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| 477 | while (str[len]) |
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| 478 | { |
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| 479 | len++; |
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| 480 | } |
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| 481 | pbuf = str; |
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| 482 | break; |
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| 483 | } |
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| 484 | default: |
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| 485 | { |
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| 486 | boot_tty_write( "\n[PANIC] in boot_printf() : illegal format\n", 43 ); |
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| 487 | } |
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| 488 | } |
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| 489 | |
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| 490 | if( pbuf != NULL ) boot_tty_write( pbuf, len ); |
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| 491 | |
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| 492 | goto printf_text; |
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| 493 | } |
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| 494 | } // boot_printf() |
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| 495 | |
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| 496 | |
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| 497 | |
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| 498 | |
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| 499 | |
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| 500 | |
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| 501 | /**************************************************************************** |
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| 502 | * Misc. functions. * |
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| 503 | ****************************************************************************/ |
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| 504 | |
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| 505 | //////////////// |
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| 506 | void boot_exit() |
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| 507 | { |
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| 508 | boot_printf("\n[BOOT PANIC] core %x suicide at cycle %d...\n", |
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| 509 | boot_get_procid() , boot_get_proctime() ); |
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| 510 | |
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| 511 | while (1) asm volatile ("nop"); |
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| 512 | |
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| 513 | } // boot_exit() |
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| 514 | |
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| 515 | //////////////////////////// |
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| 516 | uint32_t boot_get_proctime() |
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| 517 | { |
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| 518 | uint32_t res; /* Value stored in the CP0_COUNT register. */ |
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| 519 | |
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| 520 | asm volatile("mfc0 %0, $9" : "=r"(res)); |
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| 521 | |
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| 522 | return res; |
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| 523 | |
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| 524 | } // boot_get_proctime() |
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| 525 | |
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| 526 | |
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| 527 | ////////////////////////// |
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| 528 | uint32_t boot_get_procid() |
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| 529 | { |
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| 530 | uint32_t res; /* Value stored in the CP0_PROCID register. */ |
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| 531 | |
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| 532 | asm volatile("mfc0 %0, $15, 1" : "=r"(res)); |
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| 533 | |
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| 534 | return (res & 0xFFF); |
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| 535 | |
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| 536 | } // boot_get_procid() |
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| 537 | |
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| 538 | |
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| 539 | //////////////////////////////////////////////// |
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| 540 | void boot_remote_barrier( xptr_t xp_barrier, |
|---|
| 541 | uint32_t count) |
|---|
| 542 | { |
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| 543 | boot_remote_barrier_t * ptr; |
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| 544 | uint32_t cxy; |
|---|
| 545 | uint32_t expected; |
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| 546 | uint32_t current; |
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| 547 | |
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| 548 | // Extract information from the extended pointer |
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| 549 | ptr = (boot_remote_barrier_t*)GET_PTR(xp_barrier); |
|---|
| 550 | cxy = (uint32_t) GET_CXY(xp_barrier); |
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| 551 | |
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| 552 | // Explicitly test the barrier sense value because no initialization |
|---|
| 553 | if (boot_remote_lw(XPTR(cxy, &ptr->sense)) == 0) expected = 1; |
|---|
| 554 | else expected = 0; |
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| 555 | |
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| 556 | // Atomically increment counter |
|---|
| 557 | current = boot_remote_atomic_add(XPTR(cxy, &ptr->current), 1); |
|---|
| 558 | |
|---|
| 559 | // The processor arrived last resets the barrier and toggles its sense |
|---|
| 560 | if (current == (count - 1)) |
|---|
| 561 | { |
|---|
| 562 | boot_remote_sw(XPTR(cxy, &ptr->current), 0); |
|---|
| 563 | boot_remote_sw(XPTR(cxy, &ptr->sense), expected); |
|---|
| 564 | } |
|---|
| 565 | // Other processors poll the sense |
|---|
| 566 | else |
|---|
| 567 | { |
|---|
| 568 | while (boot_remote_lw(XPTR(cxy, &ptr->sense)) != expected); |
|---|
| 569 | } |
|---|
| 570 | |
|---|
| 571 | } // boot_barrier() |
|---|
| 572 | |
|---|
| 573 | //////////////////////////////////////// |
|---|
| 574 | void boot_remote_lock( xptr_t lock_xp ) |
|---|
| 575 | |
|---|
| 576 | { |
|---|
| 577 | // Extract information from the extended pointer |
|---|
| 578 | boot_remote_spinlock_t * ptr = (boot_remote_spinlock_t *)GET_PTR( lock_xp ); |
|---|
| 579 | uint32_t cxy = GET_CXY( lock_xp ); |
|---|
| 580 | |
|---|
| 581 | // get next free ticket |
|---|
| 582 | uint32_t ticket = boot_remote_atomic_add( XPTR( cxy , &ptr->ticket ) , 1 ); |
|---|
| 583 | |
|---|
| 584 | // poll the current slot index |
|---|
| 585 | while ( boot_remote_lw( XPTR( cxy , &ptr->current ) ) != ticket ) |
|---|
| 586 | { |
|---|
| 587 | asm volatile ("nop"); |
|---|
| 588 | } |
|---|
| 589 | |
|---|
| 590 | } // boot_remote_lock() |
|---|
| 591 | |
|---|
| 592 | ///////////////////////////////////////// |
|---|
| 593 | void boot_remote_unlock( xptr_t lock_xp ) |
|---|
| 594 | { |
|---|
| 595 | asm volatile ( "sync" ); // for consistency |
|---|
| 596 | |
|---|
| 597 | // Extract information from the extended pointer |
|---|
| 598 | boot_remote_spinlock_t * ptr = (boot_remote_spinlock_t *)GET_PTR( lock_xp ); |
|---|
| 599 | uint32_t cxy = GET_CXY( lock_xp ); |
|---|
| 600 | xptr_t current_xp = XPTR( cxy , &ptr->current ); |
|---|
| 601 | |
|---|
| 602 | // get current index value |
|---|
| 603 | uint32_t current = boot_remote_lw( current_xp ); |
|---|
| 604 | |
|---|
| 605 | // increment current index |
|---|
| 606 | boot_remote_sw( current_xp , current + 1 ); |
|---|
| 607 | |
|---|
| 608 | } // boot_remote_unlock() |
|---|
| 609 | |
|---|
| 610 | |
|---|