| 1 | /* |
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| 2 | * hal_user_syscall.c - Implementation of user-side HAL API for TSAR-MIPS32. |
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| 3 | * |
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| 4 | * Author Alain Greiner (2016,2017) |
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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 <hal_user.h> |
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| 25 | |
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| 26 | ///////////////////////////////////////////// |
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| 27 | inline int hal_user_syscall( reg_t service_num, |
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| 28 | reg_t arg0, |
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| 29 | reg_t arg1, |
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| 30 | reg_t arg2, |
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| 31 | reg_t arg3 ) |
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| 32 | { |
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| 33 | register int num_and_ret __asm__("v0") = service_num; |
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| 34 | register int a0 __asm__("a0") = arg0; |
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| 35 | register int a1 __asm__("a1") = arg1; |
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| 36 | register int a2 __asm__("a2") = arg2; |
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| 37 | register int a3 __asm__("a3") = arg3; |
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| 38 | |
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| 39 | asm volatile( |
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| 40 | "syscall" |
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| 41 | : "+r" (num_and_ret) |
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| 42 | : "r" (a0), |
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| 43 | "r" (a1), |
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| 44 | "r" (a2), |
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| 45 | "r" (a3) |
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| 46 | : "memory", |
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| 47 | "at", |
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| 48 | "v1", |
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| 49 | "ra", |
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| 50 | "t0", |
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| 51 | "t1", |
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| 52 | "t2", |
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| 53 | "t3", |
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| 54 | "t4", |
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| 55 | "t5", |
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| 56 | "t6", |
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| 57 | "t7", |
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| 58 | "t8", |
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| 59 | "t9" |
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| 60 | ); |
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| 61 | |
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| 62 | return (volatile int)num_and_ret; |
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| 63 | } |
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| 64 | |
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| 65 | /////////////////////////////////// |
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| 66 | int hal_user_atomic_add( int * ptr, |
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| 67 | int val ) |
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| 68 | { |
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| 69 | int current; |
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| 70 | |
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| 71 | asm volatile ( |
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| 72 | ".set noreorder \n" |
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| 73 | "1: \n" |
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| 74 | "ll %0, (%1) \n" |
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| 75 | "addu $3, %0, %2 \n" |
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| 76 | "sc $3, (%1) \n" |
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| 77 | "beq $3, $0, 1b \n" |
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| 78 | "nop \n" |
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| 79 | "sync \n" |
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| 80 | ".set reorder \n" |
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| 81 | :"=&r"(current) : "r" (ptr), "r" (val) : "$3" , "memory" ); |
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| 82 | |
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| 83 | return current; |
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| 84 | } |
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| 85 | |
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| 86 | ///////////////////// |
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| 87 | void hal_user_fence( void ) |
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| 88 | { |
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| 89 | asm volatile ( "sync" ); |
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| 90 | } |
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