| 1 | /* |
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| 2 | * sys_fg.c - Kernel function implementing the "fg" system call. |
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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 <kernel_config.h> |
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| 25 | #include <hal_types.h> |
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| 26 | #include <hal_irqmask.h> |
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| 27 | #include <errno.h> |
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| 28 | #include <thread.h> |
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| 29 | #include <printk.h> |
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| 30 | #include <process.h> |
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| 31 | #include <shared_syscalls.h> |
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| 32 | #include <cluster.h> |
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| 33 | #include <rpc.h> |
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| 34 | |
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| 35 | ////////////////////////// |
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| 36 | int sys_fg( pid_t pid ) |
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| 37 | { |
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| 38 | xptr_t process_xp; |
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| 39 | process_t * process_ptr; |
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| 40 | cxy_t process_cxy; |
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| 41 | xptr_t chdev_xp; |
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| 42 | chdev_t * chdev_ptr; |
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| 43 | cxy_t chdev_cxy; |
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| 44 | |
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| 45 | thread_t * this = CURRENT_THREAD; |
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| 46 | |
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| 47 | #if CONFIG_SYSCALL_DEBUG |
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| 48 | uint64_t tm_start; |
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| 49 | uint64_t tm_end; |
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| 50 | tm_start = hal_get_cycles(); |
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| 51 | printk("\n[DBG] %s : core[%x,%d] enter / process %x / cycle %d\n", |
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| 52 | __FUNCTION__ , local_cxy , this->core->lid , pid, (uint32_t)tm_start ); |
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| 53 | #endif |
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| 54 | |
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| 55 | // check process existence |
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| 56 | process_xp = cluster_get_reference_process_from_pid( pid ); |
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| 57 | |
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| 58 | if( process_xp == XPTR_NULL ) |
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| 59 | { |
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| 60 | syscall_dmsg("\n[ERROR] in %s : process %x not found\n", |
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| 61 | __FUNCTION__ , pid ); |
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| 62 | this->errno = EINVAL; |
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| 63 | return -1; |
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| 64 | } |
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| 65 | |
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| 66 | // get reference process cluster and local pointer |
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| 67 | process_ptr = (process_t *)GET_PTR( process_xp ); |
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| 68 | process_cxy = GET_CXY( process_xp ); |
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| 69 | |
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| 70 | // get extended pointer on TXT_RX chdev |
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| 71 | chdev_xp = chdev_from_file( XPTR( process_cxy , &process_ptr->fd_array.array[0] ) ); |
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| 72 | |
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| 73 | // get chdev cluster and local pointer |
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| 74 | chdev_ptr = (chdev_t *)GET_PTR( chdev_xp ); |
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| 75 | chdev_cxy = GET_CXY( chdev_xp ); |
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| 76 | |
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| 77 | // set reference process owner in TXT_RX chdev |
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| 78 | hal_remote_swd( XPTR( chdev_cxy , &chdev_ptr->ext.txt.owner_xp ) , process_xp ); |
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| 79 | |
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| 80 | hal_fence(); |
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| 81 | |
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| 82 | #if CONFIG_SYSCALL_DEBUG |
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| 83 | tm_end = hal_get_cycles(); |
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| 84 | printk("\n[DBG] %s : core[%x,%d] exit / process %x / cost = %d\n", |
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| 85 | __FUNCTION__ , local_cxy , this->core->lid , pid, (uint32_t)(tm_end - tm_start) ); |
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| 86 | #endif |
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| 87 | |
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| 88 | return 0; |
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| 89 | |
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| 90 | } // end sys_kill() |
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| 91 | |
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