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annotate packages/redboot/current/src/syscall.c @ 202:353a011b23b8

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Merge from eCos master repository on 2002-01-11-06:43:03-GMT
author jlarmour
date Fri, 11 Jan 2002 16:53:46 +0000
parents 678094f34118
children e0c0827131d1
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1 /*==========================================================================
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2 //
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3 // syscall.c
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4 //
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5 // Redboot syscall handling for GNUPro bsp support
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): msalter
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35 // Contributors: msalter
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36 // Date: 1999-02-20
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37 // Purpose: Temporary support for gnupro bsp
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38 //
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39 //####DESCRIPTIONEND####
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40 //
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41 //=========================================================================*/
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42
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43 #include <redboot.h>
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44 #include <cyg/hal/hal_intr.h>
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45 #include <cyg/hal/drv_api.h>
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47 #ifdef CYGSEM_REDBOOT_BSP_SYSCALLS
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48
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49 #define EIO 5 /* I/O error */
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50
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51 // These are required by the ANSI C part of newlib (excluding system() of
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52 // course).
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53 #define SYS_exit 1
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54 #define SYS_open 2
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55 #define SYS_close 3
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56 #define SYS_read 4
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57 #define SYS_write 5
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58 #define SYS_lseek 6
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59 #define SYS_unlink 7
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60 #define SYS_getpid 8
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61 #define SYS_kill 9
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62 #define SYS_fstat 10
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63 //#define SYS_sbrk 11 - not currently a system call, but reserved.
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64
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65 // ARGV support.
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66 #define SYS_argvlen 12
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67 #define SYS_argv 13
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68
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69 // These are extras added for one reason or another.
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70 #define SYS_chdir 14
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71 #define SYS_stat 15
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72 #define SYS_chmod 16
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73 #define SYS_utime 17
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74 #define SYS_time 18
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75 #define SYS_times 20
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76
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77 #define SYS_interrupt 1000
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78 #define SYS_meminfo 1001
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79
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80 #define __GET_SHARED 0xbaad // 47789 decimal
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81
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82
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83 /*
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84 * Clients of this BSP will need to have access to BSP functions and
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85 * data structures. Because, the client and the BSP may not be linked
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86 * together, a structure of vectors is used to gain this access. A
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87 * pointer to this structure can be gotten via a syscall. This syscall
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88 * is made automatically from within the crt0.o file.
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89 */
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90 typedef struct {
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91 int version; /* version number for future expansion */
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92 const void **__ictrl_table;
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93 void **__exc_table;
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94 void *__dbg_vector;
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95 void *__kill_vector;
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96 void *__console_procs;
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97 void *__debug_procs;
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98 void (*__flush_dcache)(void *__p, int __nbytes);
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99 void (*__flush_icache)(void *__p, int __nbytes);
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100 void *__cpu_data;
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101 void *__board_data;
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102 void *__sysinfo;
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103 int (*__set_debug_comm)(int __comm_id);
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104 int (*__set_console_comm)(int __comm_id);
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105 int (*__set_serial_baud)(int __comm_id, int baud);
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106 void *__dbg_data;
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107 void (*__reset)(void);
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108 int __console_interrupt_flag;
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109 } __shared_t;
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110
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111 static __shared_t __shared_data = { 2 };
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112
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113 static inline char __getc(void)
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114 {
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115 char c;
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116 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
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117
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118 if (__chan)
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119 c = CYGACC_COMM_IF_GETC(*__chan);
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120 else {
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121 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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122 c = CYGACC_COMM_IF_GETC(*__chan);
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123 }
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124 return c;
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125 }
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126
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127 static inline void __putc(char c)
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128 {
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129 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
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130 if (__chan)
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131 CYGACC_COMM_IF_PUTC(*__chan, c);
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132 else {
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133 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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134 CYGACC_COMM_IF_PUTC(*__chan, c);
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135 }
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136 }
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138
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139 // Timer support
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140
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141 static cyg_handle_t sys_timer_handle;
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142 static cyg_interrupt sys_timer_interrupt;
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143 static cyg_uint32 sys_timer_ticks = 0;
182
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144
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145 static void
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146 sys_timer_dsr(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
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147 {
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148 // do nothing
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149 }
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150
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151
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152 static cyg_uint32
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153 sys_timer_isr(cyg_vector_t vector, cyg_addrword_t data)
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154 {
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155 ++sys_timer_ticks;
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156
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157 HAL_CLOCK_RESET(CYGNUM_HAL_INTERRUPT_RTC, CYGNUM_HAL_RTC_PERIOD);
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158
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159 cyg_drv_interrupt_acknowledge(CYGNUM_HAL_INTERRUPT_RTC);
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160
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161 return 0;
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162 }
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163
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164
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165 static void sys_timer_init(void)
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166 {
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167 HAL_CLOCK_INITIALIZE(CYGNUM_HAL_RTC_PERIOD);
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168
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169 cyg_drv_interrupt_create(
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170 CYGNUM_HAL_INTERRUPT_RTC,
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171 0, // Priority - unused
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172 (CYG_ADDRWORD)0, // Data item passed to ISR & DSR
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173 sys_timer_isr, // ISR
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174 sys_timer_dsr, // DSR
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175 &sys_timer_handle, // handle to intr obj
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176 &sys_timer_interrupt ); // space for int obj
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177
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178 cyg_drv_interrupt_attach(sys_timer_handle);
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179
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180 cyg_drv_interrupt_unmask(CYGNUM_HAL_INTERRUPT_RTC);
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181 }
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182
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183
136
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184 //
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185 // read -- read bytes from the serial port. Ignore fd, since
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186 // we only have stdin.
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187 static int
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188 sys_read(int fd, char *buf, int nbytes)
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189 {
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190 int i = 0;
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191
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192 for (i = 0; i < nbytes; i++) {
182
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193 *(buf + i) = __getc();
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194 if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {
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195 (*(buf + i + 1)) = 0;
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196 break;
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197 }
136
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198 }
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199 return (i);
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200 }
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201
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202
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203 //
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204 // write -- write bytes to the serial port. Ignore fd, since
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205 // stdout and stderr are the same. Since we have no filesystem,
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206 // open will only return an error.
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207 //
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208 static int
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209 sys_write(int fd, char *buf, int nbytes)
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210 {
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211 #define WBUFSIZE 256
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212 int tosend;
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213
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214 tosend = nbytes;
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215
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216 while (tosend > 0) {
182
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217 if (*buf == '\n')
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218 __putc('\r');
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219 __putc(*buf++);
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220 tosend--;
136
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221 }
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222
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223 return (nbytes);
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224 }
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225
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226
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227 //
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228 // open -- open a file descriptor. We don't have a filesystem, so
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229 // we return an error.
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230 //
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231 static int
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232 sys_open (const char *buf, int flags, int mode)
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233 {
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234 return (-EIO);
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235 }
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236
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237
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238 //
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239 // close -- We don't need to do anything, but pretend we did.
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240 //
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241 static int
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242 sys_close(int fd)
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243 {
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244 return (0);
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245 }
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246
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247
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248 //
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249 // lseek -- Since a serial port is non-seekable, we return an error.
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250 //
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251 static int
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252 sys_lseek(int fd, int offset, int whence)
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253 {
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254 return (-EIO);
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255 }
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256
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257 #define NS_PER_TICK (CYGNUM_HAL_RTC_NUMERATOR/CYGNUM_HAL_RTC_DENOMINATOR)
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258 #define TICKS_PER_SEC (1000000000L / NS_PER_TICK)
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259
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260 // This needs to match newlib HZ which is normally 60.
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261 #define HZ 60
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262
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263 static int
191
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264 sys_times(unsigned long *p)
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265 {
182
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266 static int inited = 0;
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267
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268 if (!inited) {
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269 inited = 1;
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270 sys_timer_init();
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271 }
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272
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273 /* target clock runs at CLOCKS_PER_SEC. Convert to HZ */
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274 if (p)
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275 *p = (sys_timer_ticks * HZ) / TICKS_PER_SEC;
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276
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277 return 0;
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278 }
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279
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280 //
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281 // Generic syscall handler.
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282 //
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283 // Returns 0 if syscall number is not handled by this
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284 // module, 1 otherwise. This allows applications to
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285 // extend the syscall handler by using exception chaining.
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286 //
151
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287 CYG_ADDRWORD
182
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288 __do_syscall(CYG_ADDRWORD func, // syscall function number
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289 CYG_ADDRWORD arg1, CYG_ADDRWORD arg2, // up to four args.
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290 CYG_ADDRWORD arg3, CYG_ADDRWORD arg4,
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291 CYG_ADDRWORD *retval) // syscall return value
136
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292 {
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293 int err = 0;
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294
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295 switch (func) {
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296
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297 case SYS_read:
182
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298 err = sys_read((int)arg1, (char *)arg2, (int)arg3);
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299 break;
136
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300
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301 case SYS_write:
182
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302 err = sys_write((int)arg1, (char *)arg2, (int)arg3);
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303 break;
136
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304
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305 case SYS_open:
182
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306 err = sys_open((const char *)arg1, (int)arg2, (int)arg3);
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307 break;
136
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308
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309 case SYS_close:
182
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310 err = sys_close((int)arg1);
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311 break;
136
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312
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313 case SYS_lseek:
182
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314 err = sys_lseek((int)arg1, (int)arg2, (int)arg3);
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315 break;
136
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316
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317 case SYS_utime:
191
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318 // FIXME. Some libglosses depend on this behavior.
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319 err = sys_times((unsigned long *)arg1);
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320 break;
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321
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322 case SYS_times:
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323 err = sys_times((unsigned long *)arg1);
182
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324 break;
136
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325
151
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326 case SYS_meminfo:
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327 err = 1;
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328 *(unsigned long *)arg1 = (unsigned long)(ram_end-ram_start);
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329 *(unsigned long *)arg2 = (unsigned long)ram_end;
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330 break;
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331
136
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332 case __GET_SHARED:
182
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333 *(__shared_t **)arg1 = &__shared_data;
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334 break;
136
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335
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336 default:
182
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337 return 0;
136
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338 }
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339
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340 *retval = err;
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341 return 1;
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342 }
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343
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344 #endif