[7150f00f] | 1 | /*-------------------------------------------------------------------------+ |
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| 2 | | bspstart.c v1.1 - PC386 BSP - 1997/08/07 |
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| 3 | +--------------------------------------------------------------------------+ |
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| 4 | | This file contains the PC386 BSP startup package. It includes application, |
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| 5 | | board, and monitor specific initialization and configuration. The generic CPU |
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| 6 | | dependent initialization has been performed before this routine is invoked. |
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| 7 | +--------------------------------------------------------------------------+ |
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| 8 | | (C) Copyright 1997 - |
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| 9 | | - NavIST Group - Real-Time Distributed Systems and Industrial Automation |
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| 10 | | |
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| 11 | | http://pandora.ist.utl.pt |
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| 12 | | |
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| 13 | | Instituto Superior Tecnico * Lisboa * PORTUGAL |
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| 14 | +--------------------------------------------------------------------------+ |
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| 15 | | Disclaimer: |
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| 16 | | |
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| 17 | | This file is provided "AS IS" without warranty of any kind, either |
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| 18 | | expressed or implied. |
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| 19 | +--------------------------------------------------------------------------+ |
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| 20 | | This code is based on: |
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| 21 | | bspstart.c,v 1.8 1996/05/28 13:12:40 joel Exp - go32 BSP |
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| 22 | | With the following copyright notice: |
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| 23 | | ************************************************************************** |
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[60b791ad] | 24 | | * COPYRIGHT (c) 1989-1998. |
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[6f9c75c3] | 25 | | * On-Line Applications Research Corporation (OAR). |
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| 26 | | * Copyright assigned to U.S. Government, 1994. |
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| 27 | | * |
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| 28 | | * The license and distribution terms for this file may be |
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| 29 | | * found in found in the file LICENSE in this distribution or at |
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| 30 | | * http://www.OARcorp.com/rtems/license.html. |
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[7150f00f] | 31 | | ************************************************************************** |
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[6f9c75c3] | 32 | | |
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| 33 | | $Id$ |
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[7150f00f] | 34 | +--------------------------------------------------------------------------*/ |
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| 35 | |
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| 36 | |
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| 37 | #include <bsp.h> |
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| 38 | #include <libcsupport.h> |
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| 39 | #include <rtems/libio.h> |
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| 40 | |
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| 41 | /*-------------------------------------------------------------------------+ |
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| 42 | | Global Variables |
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| 43 | +--------------------------------------------------------------------------*/ |
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| 44 | #ifdef RTEMS_SMALL_MEMORY |
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| 45 | extern rtems_unsigned32 _end; /* End of BSS. Defined in 'linkcmds'. */ |
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| 46 | |
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| 47 | rtems_unsigned32 rtemsFreeMemStart = (rtems_unsigned32)&_end; |
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| 48 | /* Address of start of free memory - should be updated |
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| 49 | after creating new partitions or regions. */ |
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| 50 | #else |
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| 51 | rtems_unsigned32 rtemsFreeMemStart = RAM_START; |
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| 52 | /* RAM_START defined in 'bsp.h'. */ |
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| 53 | #endif /* RTEMS_SMALL_MEMORY */ |
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| 54 | |
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| 55 | /* The original BSP configuration table from the application and our copy of it |
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| 56 | with some changes. */ |
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| 57 | |
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| 58 | extern rtems_configuration_table Configuration; |
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| 59 | rtems_configuration_table BSP_Configuration; |
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| 60 | |
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| 61 | rtems_cpu_table Cpu_table; /* CPU configuration table. */ |
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| 62 | char *rtems_progname; /* Program name - from main(). */ |
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| 63 | |
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| 64 | |
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| 65 | /*-------------------------------------------------------------------------+ |
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| 66 | | External Prototypes |
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| 67 | +--------------------------------------------------------------------------*/ |
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| 68 | extern void _exit(int); /* define in exit.c */ |
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| 69 | |
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| 70 | /*-------------------------------------------------------------------------+ |
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| 71 | | Function: bsp_libc_init |
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| 72 | | Description: Initialize whatever libc we are using. Called from |
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| 73 | | pretasking hook. |
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| 74 | | Global Variables: rtemsFreeMemStart. |
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| 75 | | Arguments: None. |
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| 76 | | Returns: Nothing. |
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| 77 | +--------------------------------------------------------------------------*/ |
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| 78 | static void |
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| 79 | bsp_libc_init(void) |
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| 80 | { |
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| 81 | if (rtemsFreeMemStart & (CPU_ALIGNMENT - 1)) /* not aligned => align it */ |
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| 82 | rtemsFreeMemStart = (rtemsFreeMemStart+CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1); |
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| 83 | |
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| 84 | RTEMS_Malloc_Initialize((void *)rtemsFreeMemStart, HEAP_SIZE << 10, 0); |
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| 85 | rtemsFreeMemStart += HEAP_SIZE << 10; /* HEAP_SIZE is in KBytes */ |
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| 86 | |
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| 87 | /* Init the RTEMS libio facility to provide UNIX-like system calls for use by |
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| 88 | newlib (ie: provide __rtems_open, __rtems_close, etc). Uses malloc() |
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| 89 | to get area for the iops, so must be after malloc initialization. */ |
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| 90 | |
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| 91 | rtems_libio_init(); |
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| 92 | |
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| 93 | /* Set up for the libc handling. */ |
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| 94 | |
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| 95 | if (BSP_Configuration.ticks_per_timeslice > 0) |
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| 96 | libc_init(1); /* reentrant if possible */ |
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| 97 | else |
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| 98 | libc_init(0); /* non-reentrant */ |
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| 99 | } /* bsp_libc_init */ |
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| 100 | |
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| 101 | |
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| 102 | /*-------------------------------------------------------------------------+ |
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| 103 | | Function: bsp_pretasking_hook |
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| 104 | | Description: BSP pretasking hook. Called just before drivers are |
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| 105 | | initialized. Used to setup libc and install any BSP |
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| 106 | | extensions. NOTE: Must not use libc (to do io) from here, |
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| 107 | | since drivers are not yet initialized. |
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| 108 | | Global Variables: None. |
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| 109 | | Arguments: None. |
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| 110 | | Returns: Nothing. |
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| 111 | +--------------------------------------------------------------------------*/ |
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| 112 | void |
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| 113 | bsp_pretasking_hook(void) |
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| 114 | { |
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| 115 | bsp_libc_init(); |
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| 116 | |
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| 117 | #ifdef RTEMS_DEBUG |
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| 118 | |
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| 119 | rtems_debug_enable(RTEMS_DEBUG_ALL_MASK); |
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| 120 | |
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| 121 | #endif /* RTEMS_DEBUG */ |
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| 122 | } /* bsp_pretasking_hook */ |
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| 123 | |
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| 124 | |
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[8f95b5f] | 125 | /* |
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| 126 | * Use the shared bsp_postdriver_hook() implementation |
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| 127 | */ |
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[7150f00f] | 128 | |
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[8f95b5f] | 129 | void bsp_postdriver_hook(void); |
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[7150f00f] | 130 | |
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| 131 | |
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| 132 | /*-------------------------------------------------------------------------+ |
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[e2a2ec60] | 133 | | Function: bsp_start |
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| 134 | | Description: Called before main is invoked. |
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[7150f00f] | 135 | | Global Variables: None. |
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| 136 | | Arguments: None. |
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| 137 | | Returns: Nothing. |
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| 138 | +--------------------------------------------------------------------------*/ |
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[e2a2ec60] | 139 | void bsp_start( void ) |
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[7150f00f] | 140 | { |
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| 141 | /* If we don't have command line arguments set default program name. */ |
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| 142 | |
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| 143 | Cpu_table.pretasking_hook = bsp_pretasking_hook; /* init libc, etc. */ |
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| 144 | Cpu_table.predriver_hook = NULL; /* use system's */ |
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| 145 | Cpu_table.postdriver_hook = bsp_postdriver_hook; |
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| 146 | Cpu_table.idle_task = NULL; |
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| 147 | /* do not override system IDLE task */ |
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| 148 | Cpu_table.do_zero_of_workspace = TRUE; |
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| 149 | Cpu_table.interrupt_table_segment = get_ds(); |
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| 150 | Cpu_table.interrupt_table_offset = (void *)Interrupt_descriptor_table; |
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| 151 | Cpu_table.interrupt_stack_size = 4096; |
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| 152 | Cpu_table.extra_mpci_receive_server_stack = 0; |
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| 153 | |
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| 154 | /* Copy user's table and make necessary adjustments. */ |
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| 155 | |
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| 156 | BSP_Configuration = Configuration; |
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| 157 | |
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| 158 | /* Place RTEMS workspace at top of physical RAM (RAM_END defined in 'bsp.h' */ |
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| 159 | |
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| 160 | BSP_Configuration.work_space_start = |
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| 161 | (void *)(RAM_END - BSP_Configuration.work_space_size); |
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| 162 | |
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| 163 | /* Tell libio how many fd's we want and allow it to tweak config. */ |
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| 164 | |
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| 165 | rtems_libio_config(&BSP_Configuration, BSP_LIBIO_MAX_FDS); |
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| 166 | |
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[e2a2ec60] | 167 | #if 0 |
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[7150f00f] | 168 | rtems_initialize_executive(&BSP_Configuration, &Cpu_table); |
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| 169 | /* does not return */ |
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| 170 | |
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| 171 | /*-------------------------------------------------------------------------+ |
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| 172 | | We only return here if the executive has finished. This happens when the |
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| 173 | | task has called exit(). We will then call _exit() which is part of the bsp. |
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| 174 | +--------------------------------------------------------------------------*/ |
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| 175 | |
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| 176 | for (;;) |
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| 177 | _exit(0); |
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| 178 | |
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| 179 | /* no cleanup necessary for PC386 */ |
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| 180 | |
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| 181 | return 0; |
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[e2a2ec60] | 182 | #endif |
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| 183 | } /* bsp_start */ |
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