[533] | 1 | /* |
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| 2 | * soclib_mtty.c - soclib tty driver implementation. |
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| 3 | * |
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| 4 | * Author Alain Greiner (2016,2017,2018) |
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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 | |
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| 25 | #include <hal_kernel_types.h> |
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| 26 | #include <dev_txt.h> |
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| 27 | #include <chdev.h> |
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| 28 | #include <soclib_mtty.h> |
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| 29 | #include <remote_spinlock.h> |
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| 30 | #include <thread.h> |
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| 31 | #include <printk.h> |
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| 32 | #include <hal_special.h> |
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| 33 | |
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| 34 | #if (DEBUG_SYS_READ & 1) |
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| 35 | extern uint32_t enter_tty_cmd_read; |
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| 36 | extern uint32_t exit_tty_cmd_read; |
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| 37 | |
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| 38 | extern uint32_t enter_tty_isr_read; |
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| 39 | extern uint32_t exit_tty_isr_read; |
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| 40 | #endif |
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| 41 | |
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| 42 | #if (DEBUG_SYS_WRITE & 1) |
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| 43 | extern uint32_t enter_tty_cmd_write; |
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| 44 | extern uint32_t exit_tty_cmd_write; |
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| 45 | |
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| 46 | extern uint32_t enter_tty_isr_write; |
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| 47 | extern uint32_t exit_tty_isr_write; |
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| 48 | #endif |
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| 49 | |
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[539] | 50 | extern chdev_directory_t chdev_dir; // allocated in the kernel_init.c file. |
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| 51 | extern spinlock_t txt0_lock; // Initialized in kernel_init.c |
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[533] | 52 | //////////////////////////////////////////////////////////////////////////////////// |
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| 53 | // These global variables implement the MTTY_RX FIFOs (one per channel) |
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| 54 | //////////////////////////////////////////////////////////////////////////////////// |
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| 55 | |
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| 56 | __attribute__((section(".kdata"))) |
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[534] | 57 | mtty_fifo_t mtty_rx_fifo[CONFIG_MAX_TXT_CHANNELS]; |
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[533] | 58 | |
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| 59 | __attribute__((section(".kdata"))) |
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[534] | 60 | mtty_fifo_t mtty_tx_fifo[CONFIG_MAX_TXT_CHANNELS]; |
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[533] | 61 | |
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| 62 | /////////////////////////////////////// |
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| 63 | void soclib_mtty_init( chdev_t * chdev ) |
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| 64 | { |
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| 65 | xptr_t reg_xp; |
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| 66 | |
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| 67 | // initialise function pointers in chdev |
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| 68 | chdev->cmd = &soclib_mtty_cmd; |
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| 69 | chdev->isr = &soclib_mtty_isr; |
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| 70 | chdev->aux = &soclib_mtty_aux; |
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| 71 | |
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| 72 | // get TTY channel and extended pointer on TTY peripheral base address |
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| 73 | xptr_t tty_xp = chdev->base; |
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| 74 | uint32_t channel = chdev->channel; |
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| 75 | bool_t is_rx = chdev->is_rx; |
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| 76 | |
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| 77 | // get SOCLIB_TTY device cluster and local pointer |
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| 78 | cxy_t tty_cxy = GET_CXY( tty_xp ); |
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| 79 | uint32_t * tty_ptr = GET_PTR( tty_xp ); |
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| 80 | |
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| 81 | // enable interruptions for RX but not for TX |
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[537] | 82 | reg_xp = XPTR( tty_cxy , tty_ptr + MTTY_CONFIG ); |
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[533] | 83 | hal_remote_sw( reg_xp , MTTY_CONFIG_RX_ENABLE ); |
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| 84 | |
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| 85 | // reset relevant FIFO |
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| 86 | if( is_rx ) |
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| 87 | { |
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[534] | 88 | mtty_rx_fifo[channel].sts = 0; |
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| 89 | mtty_rx_fifo[channel].ptr = 0; |
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| 90 | mtty_rx_fifo[channel].ptw = 0; |
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[533] | 91 | } |
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| 92 | else |
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| 93 | { |
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[534] | 94 | mtty_tx_fifo[channel].sts = 0; |
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| 95 | mtty_tx_fifo[channel].ptr = 0; |
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| 96 | mtty_tx_fifo[channel].ptw = 0; |
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[533] | 97 | } |
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| 98 | } // end soclib_mtty_init() |
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| 99 | |
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| 100 | ////////////////////////////////////////////////////////////// |
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| 101 | void __attribute__ ((noinline)) soclib_mtty_cmd( xptr_t th_xp ) |
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| 102 | { |
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[534] | 103 | mtty_fifo_t * fifo; // MTTY_RX or MTTY_TX FIFO |
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[533] | 104 | char byte; // byte value |
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| 105 | uint32_t done; // number of bytes moved |
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| 106 | |
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| 107 | // get client thread cluster and local pointer |
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| 108 | cxy_t th_cxy = GET_CXY( th_xp ); |
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| 109 | thread_t * th_ptr = GET_PTR( th_xp ); |
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| 110 | |
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| 111 | // get command arguments |
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| 112 | uint32_t type = hal_remote_lw ( XPTR( th_cxy , &th_ptr->txt_cmd.type ) ); |
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| 113 | xptr_t buf_xp = hal_remote_lwd( XPTR( th_cxy , &th_ptr->txt_cmd.buf_xp ) ); |
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| 114 | uint32_t count = hal_remote_lw ( XPTR( th_cxy , &th_ptr->txt_cmd.count ) ); |
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| 115 | xptr_t error_xp = XPTR( th_cxy , &th_ptr->txt_cmd.error ); |
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| 116 | |
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| 117 | #if (DEBUG_SYS_READ & 1) |
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| 118 | if( type == TXT_READ) enter_tty_cmd_read = (uint32_t)hal_get_cycles(); |
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| 119 | #endif |
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| 120 | |
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| 121 | #if (DEBUG_SYS_WRITE & 1) |
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| 122 | if( type == TXT_WRITE) enter_tty_cmd_write = (uint32_t)hal_get_cycles(); |
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| 123 | #endif |
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| 124 | |
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| 125 | // get TXT device cluster and pointers |
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| 126 | xptr_t dev_xp = (xptr_t)hal_remote_lwd( XPTR( th_cxy , &th_ptr->txt_cmd.dev_xp ) ); |
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| 127 | cxy_t dev_cxy = GET_CXY( dev_xp ); |
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| 128 | chdev_t * dev_ptr = GET_PTR( dev_xp ); |
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| 129 | |
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| 130 | // get cluster and pointers for SOCLIB_TTY peripheral base segment |
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| 131 | xptr_t tty_xp = (xptr_t)hal_remote_lwd( XPTR( dev_cxy , &dev_ptr->base ) ); |
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| 132 | cxy_t tty_cxy = GET_CXY( tty_xp ); |
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| 133 | uint32_t * tty_ptr = GET_PTR( tty_xp ); |
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| 134 | |
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| 135 | // get TTY channel index and channel base address |
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| 136 | uint32_t channel = hal_remote_lw( XPTR( dev_cxy , &dev_ptr->channel ) ); |
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[537] | 137 | uint32_t * base = tty_ptr; |
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[533] | 138 | |
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| 139 | /////////////////////// |
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| 140 | if( type == TXT_WRITE ) // write bytes to MTTY_TX FIFO |
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| 141 | { |
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[534] | 142 | fifo = &mtty_tx_fifo[channel]; |
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[533] | 143 | |
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| 144 | done = 0; |
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| 145 | |
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| 146 | while( done < count ) |
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| 147 | { |
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| 148 | if( fifo->sts < MTTY_FIFO_DEPTH ) // put one byte to FIFO if TX_FIFO not full |
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| 149 | { |
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| 150 | // get one byte from command buffer |
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| 151 | byte = hal_remote_lb( buf_xp + done ); |
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| 152 | |
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| 153 | #if DEBUG_HAL_TXT_TX |
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| 154 | uint32_t tx_cycle = (uint32_t)hal_get_cycles(); |
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| 155 | if( DEBUG_HAL_TXT_TX < tx_cycle ) |
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| 156 | printk("\n[DBG] %s : thread %x put character <%c> to TXT%d_TX fifo / cycle %d\n", |
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| 157 | __FUNCTION__, CURRENT_THREAD, byte, channel, tx_cycle ); |
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| 158 | #endif |
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| 159 | // write byte to FIFO |
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| 160 | fifo->data[fifo->ptw] = byte; |
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| 161 | |
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| 162 | // prevent race |
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| 163 | hal_fence(); |
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| 164 | |
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| 165 | // update FIFO state |
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| 166 | fifo->ptw = (fifo->ptw + 1) % MTTY_FIFO_DEPTH; |
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| 167 | hal_atomic_add( &fifo->sts , 1 ); |
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| 168 | |
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| 169 | // udate number of bytes moved |
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| 170 | done++; |
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| 171 | |
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| 172 | // enable TX_IRQ |
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[538] | 173 | // vci_multi_tty devices never raise TX IRQs |
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| 174 | // so the following instructions are useless |
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| 175 | // and moreover they kernel panic |
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| 176 | // xptr_t config_xp = XPTR( tty_cxy , base + MTTY_CONFIG ); |
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| 177 | // uint32_t old = hal_remote_lw( config_xp ); |
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| 178 | // uint32_t new = old | MTTY_CONFIG_TX_ENABLE; |
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| 179 | // hal_remote_atomic_cas( config_xp , old , new ); |
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| 180 | // hal_remote_sw( XPTR( tty_cxy , base + MTTY_CONFIG ) , MTTY_CONFIG_TX_ENABLE ); |
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[533] | 181 | } |
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| 182 | else // block & deschedule if TX_FIFO full |
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| 183 | { |
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| 184 | // block on ISR |
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| 185 | thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_ISR ); |
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| 186 | |
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| 187 | // deschedule |
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| 188 | sched_yield( "MTTY_TX_FIFO full" ); |
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| 189 | } |
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| 190 | } |
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| 191 | |
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| 192 | // set error status in command and return |
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| 193 | hal_remote_sw( error_xp , 0 ); |
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| 194 | } |
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| 195 | /////////////////////////// |
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| 196 | else if( type == TXT_READ ) // read bytes from MTTY_RX FIFO |
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| 197 | { |
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[534] | 198 | fifo = &mtty_rx_fifo[channel]; |
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[533] | 199 | |
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| 200 | done = 0; |
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| 201 | |
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| 202 | while( done < count ) |
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| 203 | { |
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| 204 | if( fifo->sts > 0 ) // get byte from FIFO if not empty |
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| 205 | { |
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| 206 | // get one byte from FIFO |
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| 207 | char byte = fifo->data[fifo->ptr]; |
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| 208 | |
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| 209 | #if DEBUG_HAL_TXT_RX |
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| 210 | uint32_t rx_cycle = (uint32_t)hal_get_cycles(); |
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| 211 | if( DEBUG_HAL_TXT_RX < rx_cycle ) |
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| 212 | printk("\n[DBG] %s : thread %x get character <%c> from TXT%d_RX fifo / cycle %d\n", |
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| 213 | __FUNCTION__, CURRENT_THREAD, byte, channel, rx_cycle ); |
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| 214 | #endif |
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| 215 | // update FIFO state |
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| 216 | fifo->ptr = (fifo->ptr + 1) % MTTY_FIFO_DEPTH; |
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| 217 | hal_atomic_add( &fifo->sts , -1 ); |
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| 218 | |
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| 219 | // set byte to command buffer |
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| 220 | hal_remote_sb( buf_xp + done , byte ); |
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| 221 | |
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| 222 | // udate number of bytes |
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| 223 | done++; |
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| 224 | } |
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| 225 | else // deschedule if FIFO empty |
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| 226 | { |
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| 227 | // block on ISR |
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| 228 | thread_block( XPTR( local_cxy , CURRENT_THREAD ) , THREAD_BLOCKED_ISR ); |
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| 229 | |
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| 230 | // deschedule |
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| 231 | sched_yield( "MTTY_RX_FIFO empty" ); |
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| 232 | } |
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| 233 | } // end while |
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| 234 | |
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| 235 | // set error status in command |
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| 236 | hal_remote_sw( error_xp , 0 ); |
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| 237 | } |
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| 238 | else |
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| 239 | { |
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| 240 | assert( false , __FUNCTION__ , "illegal TXT command\n" ); |
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| 241 | } |
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| 242 | |
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| 243 | #if (DEBUG_SYS_READ & 1) |
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| 244 | if( type == TXT_READ ) exit_tty_cmd_read = (uint32_t)hal_get_cycles(); |
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| 245 | #endif |
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| 246 | |
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| 247 | #if (DEBUG_SYS_WRITE & 1) |
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| 248 | if( type == TXT_WRITE ) exit_tty_cmd_write = (uint32_t)hal_get_cycles(); |
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| 249 | #endif |
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| 250 | |
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| 251 | } // end soclib_mtty_cmd() |
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| 252 | |
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| 253 | ///////////////////////////////////////////////////////////////// |
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| 254 | void __attribute__ ((noinline)) soclib_mtty_isr( chdev_t * chdev ) |
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| 255 | { |
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| 256 | thread_t * server; // pointer on TXT chdev server thread |
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| 257 | lid_t server_lid; // local index of core running the server thread |
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| 258 | uint32_t channel; // TXT chdev channel |
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| 259 | bool_t is_rx; // TXT chdev direction |
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| 260 | char byte; // byte value |
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| 261 | xptr_t owner_xp; // extended pointer on TXT owner process |
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| 262 | cxy_t owner_cxy; // TXT owner process cluster |
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| 263 | process_t * owner_ptr; // local pointer on TXT owner process |
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| 264 | pid_t owner_pid; // TXT owner process identifier |
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[534] | 265 | mtty_fifo_t * fifo; // pointer on MTTY_TX or MTTY_RX FIFO |
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[533] | 266 | cxy_t tty_cxy; // soclib_mtty cluster |
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| 267 | uint32_t * tty_ptr; // soclib_mtty segment base address |
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| 268 | uint32_t * base; // soclib_mtty channel base address |
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| 269 | xptr_t status_xp; // extended pointer on MTTY_STATUS register |
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| 270 | xptr_t write_xp; // extended pointer on MTTY_WRITE register |
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| 271 | xptr_t read_xp; // extended pointer on MTTY_READ register |
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| 272 | xptr_t parent_xp; // extended pointer on parent process |
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| 273 | cxy_t parent_cxy; // parent process cluster |
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| 274 | process_t * parent_ptr; // local pointer on parent process |
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| 275 | xptr_t children_lock_xp; // extended pointer on children processes lock |
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| 276 | thread_t * parent_main_ptr; // extended pointer on parent process main thread |
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| 277 | xptr_t parent_main_xp; // local pointer on parent process main thread |
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| 278 | |
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| 279 | // get TXT chdev channel, direction and server thread |
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| 280 | channel = chdev->channel; |
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| 281 | is_rx = chdev->is_rx; |
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| 282 | server = chdev->server; |
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| 283 | server_lid = server->core->lid; |
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| 284 | |
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| 285 | #if (DEBUG_SYS_READ & 1) |
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| 286 | if( is_rx ) enter_tty_isr_read = (uint32_t)hal_get_cycles(); |
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| 287 | #endif |
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| 288 | |
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| 289 | #if (DEBUG_SYS_WRITE & 1) |
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| 290 | if( is_rx == 0 ) enter_tty_isr_write = (uint32_t)hal_get_cycles(); |
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| 291 | #endif |
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| 292 | |
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| 293 | #if DEBUG_HAL_TXT_RX |
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| 294 | uint32_t rx_cycle = (uint32_t)hal_get_cycles(); |
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| 295 | #endif |
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| 296 | |
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| 297 | #if DEBUG_HAL_TXT_TX |
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| 298 | uint32_t tx_cycle = (uint32_t)hal_get_cycles(); |
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| 299 | #endif |
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| 300 | |
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| 301 | // get SOCLIB_TTY peripheral cluster and local pointer |
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| 302 | tty_cxy = GET_CXY( chdev->base ); |
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| 303 | tty_ptr = GET_PTR( chdev->base ); |
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| 304 | |
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| 305 | // get channel base address |
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[537] | 306 | base = tty_ptr; |
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[533] | 307 | |
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| 308 | // get extended pointer on TTY registers |
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| 309 | status_xp = XPTR( tty_cxy , base + MTTY_STATUS ); |
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| 310 | write_xp = XPTR( tty_cxy , base + MTTY_WRITE ); |
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| 311 | read_xp = XPTR( tty_cxy , base + MTTY_READ ); |
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| 312 | |
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| 313 | /////////////////////////// handle RX ////////////////////// |
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| 314 | if( is_rx ) |
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| 315 | { |
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[534] | 316 | fifo = &mtty_rx_fifo[channel]; |
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[533] | 317 | |
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| 318 | // try to move bytes until MTTY_READ register empty |
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| 319 | while( hal_remote_lw( status_xp ) & MTTY_STATUS_RX_FULL ) |
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| 320 | { |
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| 321 | // get one byte from MTTY_READ register & acknowledge RX_IRQ |
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| 322 | byte = (char)hal_remote_lb( read_xp ); |
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| 323 | |
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| 324 | // filter special character ^Z => block TXT owner process |
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| 325 | if( byte == 0x1A ) |
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| 326 | { |
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| 327 | |
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| 328 | #if DEBUG_HAL_TXT_RX |
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| 329 | if( DEBUG_HAL_TXT_RX < rx_cycle ) |
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| 330 | printk("\n[DBG] %s : read ^Z character from TXT%d\n", __FUNCTION__, channel ); |
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| 331 | #endif |
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| 332 | // get pointers on TXT owner process in owner cluster |
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| 333 | owner_xp = process_txt_get_owner( channel ); |
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| 334 | |
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| 335 | // check process exist |
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| 336 | assert( (owner_xp != XPTR_NULL) , __FUNCTION__, |
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| 337 | "TXT owner process not found\n" ); |
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| 338 | |
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| 339 | // get relevant infos on TXT owner process |
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| 340 | owner_cxy = GET_CXY( owner_xp ); |
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| 341 | owner_ptr = GET_PTR( owner_xp ); |
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| 342 | owner_pid = hal_remote_lw( XPTR( owner_cxy , &owner_ptr->pid ) ); |
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| 343 | |
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| 344 | // block TXT owner process only if it is not the INIT process |
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| 345 | if( owner_pid != 1 ) |
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| 346 | { |
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| 347 | // get parent process descriptor pointers |
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| 348 | parent_xp = hal_remote_lwd( XPTR( owner_cxy , &owner_ptr->parent_xp ) ); |
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| 349 | parent_cxy = GET_CXY( parent_xp ); |
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| 350 | parent_ptr = GET_PTR( parent_xp ); |
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| 351 | |
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| 352 | // get extended pointer on lock protecting children list in parent process |
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| 353 | children_lock_xp = XPTR( parent_cxy , &parent_ptr->children_lock ); |
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| 354 | |
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| 355 | // get pointers on the parent process main thread |
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| 356 | parent_main_ptr = hal_remote_lpt(XPTR(parent_cxy,&parent_ptr->th_tbl[0])); |
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| 357 | parent_main_xp = XPTR( parent_cxy , parent_main_ptr ); |
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| 358 | |
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| 359 | // transfer TXT ownership |
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| 360 | process_txt_transfer_ownership( owner_xp ); |
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| 361 | |
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| 362 | // block all threads in all clusters, but the main thread |
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| 363 | process_sigaction( owner_pid , BLOCK_ALL_THREADS ); |
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| 364 | |
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| 365 | // block the main thread |
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| 366 | xptr_t main_xp = XPTR( owner_cxy , &owner_ptr->th_tbl[0] ); |
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| 367 | thread_block( main_xp , THREAD_BLOCKED_GLOBAL ); |
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| 368 | |
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| 369 | // atomically update owner process termination state |
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| 370 | hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) , |
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| 371 | PROCESS_TERM_STOP ); |
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| 372 | |
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| 373 | // take the children lock and unblock the parent process main thread |
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| 374 | remote_spinlock_lock( children_lock_xp ); |
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| 375 | thread_unblock( parent_main_xp , THREAD_BLOCKED_WAIT ); |
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| 376 | remote_spinlock_unlock( children_lock_xp ); |
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| 377 | |
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| 378 | return; |
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| 379 | } |
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| 380 | } |
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| 381 | |
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| 382 | // filter special character ^C => kill TXT owner process |
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| 383 | if( byte == 0x03 ) |
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| 384 | { |
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| 385 | |
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| 386 | #if DEBUG_HAL_TXT_RX |
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| 387 | if( DEBUG_HAL_TXT_RX < rx_cycle ) |
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| 388 | printk("\n[DBG] %s : read ^C character from TXT%d\n", __FUNCTION__, channel ); |
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| 389 | #endif |
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| 390 | // get pointer on TXT owner process in owner cluster |
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| 391 | owner_xp = process_txt_get_owner( channel ); |
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| 392 | |
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| 393 | // check process exist |
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| 394 | assert( (owner_xp != XPTR_NULL) , __FUNCTION__, |
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| 395 | "TXT owner process not found\n" ); |
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| 396 | |
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| 397 | // get relevant infos on TXT owner process |
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| 398 | owner_cxy = GET_CXY( owner_xp ); |
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| 399 | owner_ptr = GET_PTR( owner_xp ); |
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| 400 | owner_pid = hal_remote_lw( XPTR( owner_cxy , &owner_ptr->pid ) ); |
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| 401 | |
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| 402 | // kill TXT owner process only if it is not the INIT process |
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| 403 | if( owner_pid != 1 ) |
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| 404 | { |
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| 405 | // get parent process descriptor pointers |
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| 406 | parent_xp = hal_remote_lwd( XPTR( owner_cxy , &owner_ptr->parent_xp ) ); |
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| 407 | parent_cxy = GET_CXY( parent_xp ); |
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| 408 | parent_ptr = GET_PTR( parent_xp ); |
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| 409 | |
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| 410 | // get extended pointer on lock protecting children list in parent process |
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| 411 | children_lock_xp = XPTR( parent_cxy , &parent_ptr->children_lock ); |
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| 412 | |
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| 413 | // get pointers on the parent process main thread |
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| 414 | parent_main_ptr = hal_remote_lpt(XPTR(parent_cxy,&parent_ptr->th_tbl[0])); |
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| 415 | parent_main_xp = XPTR( parent_cxy , parent_main_ptr ); |
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| 416 | |
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| 417 | // remove process from TXT list |
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| 418 | process_txt_detach( owner_xp ); |
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| 419 | |
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| 420 | // mark for delete all thread in all clusters, but the main |
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| 421 | process_sigaction( owner_pid , DELETE_ALL_THREADS ); |
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| 422 | |
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| 423 | // block main thread |
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| 424 | xptr_t main_xp = XPTR( owner_cxy , &owner_ptr->th_tbl[0] ); |
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| 425 | thread_block( main_xp , THREAD_BLOCKED_GLOBAL ); |
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| 426 | |
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| 427 | // atomically update owner process termination state |
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| 428 | hal_remote_atomic_or( XPTR( owner_cxy , &owner_ptr->term_state ) , |
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| 429 | PROCESS_TERM_KILL ); |
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| 430 | |
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| 431 | // take the children lock and unblock the parent process main thread |
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| 432 | remote_spinlock_lock( children_lock_xp ); |
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| 433 | thread_unblock( parent_main_xp , THREAD_BLOCKED_WAIT ); |
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| 434 | remote_spinlock_unlock( children_lock_xp ); |
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| 435 | |
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| 436 | return; |
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| 437 | } |
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| 438 | } |
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| 439 | |
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| 440 | // write byte in MTTY_RX FIFO if not full / discard byte if full |
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| 441 | if ( fifo->sts < MTTY_FIFO_DEPTH ) |
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| 442 | { |
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| 443 | |
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| 444 | #if DEBUG_HAL_TXT_RX |
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| 445 | if( DEBUG_HAL_TXT_RX < rx_cycle ) |
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| 446 | printk("\n[DBG] %s : put character <%c> to TXT%d_RX fifo\n", |
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| 447 | __FUNCTION__, byte, channel ); |
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| 448 | #endif |
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| 449 | // store byte into FIFO |
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| 450 | fifo->data[fifo->ptw] = (char)byte; |
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| 451 | |
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| 452 | // avoid race |
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| 453 | hal_fence(); |
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| 454 | |
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| 455 | // update RX_FIFO state |
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| 456 | fifo->ptw = (fifo->ptw + 1) % MTTY_FIFO_DEPTH; |
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| 457 | hal_atomic_add( &fifo->sts , 1 ); |
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| 458 | |
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| 459 | // unblock TXT_RX server thread |
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| 460 | thread_unblock( XPTR( local_cxy , server ) , THREAD_BLOCKED_ISR ); |
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| 461 | |
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| 462 | // send IPI to core running server thread |
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| 463 | dev_pic_send_ipi( local_cxy , server_lid ); |
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| 464 | } |
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| 465 | else |
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| 466 | { |
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| 467 | printk("\n[WARNING] %s : MTTY_RX_FIFO[%d] full => discard character <%x>\n", |
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| 468 | __FUNCTION__, channel, (uint32_t)byte ); |
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| 469 | } |
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| 470 | } // end while MTTY_READ register full |
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| 471 | |
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| 472 | } // end RX |
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| 473 | |
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| 474 | /////////////////////// handle TX ///////////////////////////// |
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| 475 | else |
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| 476 | { |
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[534] | 477 | fifo = &mtty_tx_fifo[channel]; |
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[533] | 478 | |
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| 479 | // try to move bytes until TX_FIFO empty |
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| 480 | while( fifo->sts > 0 ) |
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| 481 | { |
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| 482 | // write one byte to MTTY_WRITE register if empty / exit loop if full |
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| 483 | if( (hal_remote_lw( status_xp ) & MTTY_STATUS_TX_FULL) == 0 ) |
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| 484 | { |
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| 485 | // get one byte from TX_FIFO |
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| 486 | byte = fifo->data[fifo->ptr]; |
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| 487 | |
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| 488 | #if DEBUG_HAL_TXT_TX |
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| 489 | if( DEBUG_HAL_TXT_TX < tx_cycle ) |
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| 490 | printk("\n[DBG] %s : get character <%c> from TXT%d_TX fifo\n", |
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| 491 | __FUNCTION__, byte, channel ); |
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| 492 | #endif |
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| 493 | // update TX_FIFO state |
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| 494 | fifo->ptr = (fifo->ptr + 1) % MTTY_FIFO_DEPTH; |
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| 495 | hal_atomic_add( &fifo->sts , -1 ); |
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| 496 | |
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| 497 | // write byte to MTTY_WRITE register & acknowledge TX_IRQ |
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| 498 | hal_remote_sb( write_xp , byte ); |
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| 499 | } |
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| 500 | } |
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| 501 | |
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| 502 | // disable TX_IRQ |
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[538] | 503 | // vci_multi_tty devices never raise TX IRQs |
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| 504 | // so the following instructions are useless |
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| 505 | // and moreover they kernel panic |
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| 506 | // xptr_t config_xp = XPTR( tty_cxy , base + MTTY_CONFIG ); |
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| 507 | // uint32_t old = hal_remote_lw( config_xp ); |
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| 508 | // uint32_t new = old & ~(MTTY_CONFIG_TX_ENABLE); |
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| 509 | // hal_remote_atomic_cas( config_xp , old , new ); |
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| 510 | // hal_remote_sw( XPTR( tty_cxy , base + MTTY_CONFIG ) , 0 ); |
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[533] | 511 | |
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| 512 | // unblock TXT_TX server thread |
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| 513 | thread_unblock( XPTR( local_cxy , server ) , THREAD_BLOCKED_ISR ); |
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| 514 | |
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| 515 | // send IPI to core running server thread |
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| 516 | dev_pic_send_ipi( local_cxy , server_lid ); |
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| 517 | |
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| 518 | } // end TX |
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| 519 | |
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| 520 | hal_fence(); |
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| 521 | |
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| 522 | #if (DEBUG_SYS_READ & 1) |
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| 523 | if( is_rx ) exit_tty_isr_read = (uint32_t)hal_get_cycles(); |
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| 524 | #endif |
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| 525 | |
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| 526 | #if (DEBUG_SYS_WRITE & 1) |
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| 527 | if( is_rx == 0 ) exit_tty_isr_write = (uint32_t)hal_get_cycles(); |
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| 528 | #endif |
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| 529 | |
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| 530 | } // end soclib_mtty_isr() |
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| 531 | |
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| 532 | ///////////////////////////////////////////////////////////// |
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| 533 | void __attribute__ ((noinline)) soclib_mtty_aux( void * args ) |
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| 534 | { |
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| 535 | uint32_t status; |
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| 536 | bool_t empty; |
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| 537 | uint32_t i; |
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| 538 | |
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| 539 | xptr_t dev_xp = ((txt_sync_args_t *)args)->dev_xp; |
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| 540 | char * buffer = ((txt_sync_args_t *)args)->buffer; |
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| 541 | uint32_t count = ((txt_sync_args_t *)args)->count; |
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[539] | 542 | uint32_t channel = ((txt_sync_args_t *)args)->channel; |
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[533] | 543 | |
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| 544 | // get TXT0 chdev cluster and local pointer |
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| 545 | cxy_t dev_cxy = GET_CXY( dev_xp ); |
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| 546 | chdev_t * dev_ptr = (chdev_t *)GET_PTR( dev_xp ); |
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| 547 | |
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| 548 | // get extended pointer on TTY channel base address |
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| 549 | xptr_t tty_xp = (xptr_t)hal_remote_lwd( XPTR( dev_cxy , &dev_ptr->base ) ); |
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| 550 | |
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| 551 | // get TTY channel segment cluster and local pointer |
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| 552 | cxy_t tty_cxy = GET_CXY( tty_xp ); |
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| 553 | uint32_t * tty_ptr = (uint32_t *)GET_PTR( tty_xp ); |
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| 554 | |
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| 555 | // get extended pointers on MTTY_WRITE & MTTY_STATUS registers |
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| 556 | xptr_t write_xp = XPTR( tty_cxy , tty_ptr + MTTY_WRITE ); |
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| 557 | xptr_t status_xp = XPTR( tty_cxy , tty_ptr + MTTY_STATUS ); |
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| 558 | |
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[539] | 559 | reg_t save_sr; |
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| 560 | |
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[533] | 561 | // loop on characters (busy waiting policy) |
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| 562 | for( i = 0 ; i < count ; i++ ) |
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| 563 | { |
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[539] | 564 | // This is the MTTY multiplexing |
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| 565 | // Before each character, we send the destination TTY number for this char. |
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| 566 | // The two bytes (dest number + char) must be sent consecutively, |
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| 567 | // so to guarantee this atomicity, we use a lock to prevent other |
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| 568 | // concurrent server DEV threads to write a byte in between our two bytes |
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| 569 | |
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| 570 | // Get the lock |
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| 571 | spinlock_lock_busy( &txt0_lock, &save_sr ); |
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| 572 | |
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| 573 | // Send the destination TTY number |
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[533] | 574 | do |
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| 575 | { |
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| 576 | // get MTTY_STATUS |
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| 577 | status = hal_remote_lw( status_xp ); |
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| 578 | empty = ( (status & MTTY_STATUS_TX_FULL) == 0 ); |
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| 579 | |
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| 580 | // transfer one byte if TX buffer empty |
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[539] | 581 | if ( empty ) hal_remote_sb( write_xp , channel + '0' ); |
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| 582 | |
---|
| 583 | } |
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| 584 | while ( empty == false ); |
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| 585 | |
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| 586 | // Send the character |
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| 587 | do |
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| 588 | { |
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| 589 | // get MTTY_STATUS |
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| 590 | status = hal_remote_lw( status_xp ); |
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| 591 | empty = ( (status & MTTY_STATUS_TX_FULL) == 0 ); |
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| 592 | |
---|
| 593 | // transfer one byte if TX buffer empty |
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[533] | 594 | if ( empty ) hal_remote_sb( write_xp , buffer[i] ); |
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| 595 | } |
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| 596 | while ( empty == false ); |
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[539] | 597 | |
---|
| 598 | // Release the lock |
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| 599 | spinlock_unlock_busy( &txt0_lock, save_sr ); |
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[533] | 600 | } |
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| 601 | } // end soclib_mtty_aux() |
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| 602 | |
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| 603 | |
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| 604 | |
---|