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annotate packages/hal/powerpc/arch/current/src/redboot_linux_exec.c @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents a85441e685fa
children
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1 //==========================================================================
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2 //
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3 // redboot_linux_exec.c
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4 //
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5 // RedBoot command to boot Linux
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6 //
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7 //==========================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //####OTHERCOPYRIGHTBEGIN####
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40 //
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41 // The structure definitions below are taken from include/asm-/redboot.h in
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42 // the Linux kernel, Copyright (c) 2002, 2003 Gary Thomas, Copyright (c) 1997 Dan Malek.
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43 // Their presence here is for the express purpose of communication with the Linux
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44 // kernel being booted and is considered 'fair use' by the original author and
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45 // are included with their permission.
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46 //
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47 //####OTHERCOPYRIGHTEND####
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48 //==========================================================================
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49 //#####DESCRIPTIONBEGIN####
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50 //
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51 // Author(s): msalter
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52 // Contributors: gthomas,msalter
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53 // Date: 2002-01-14
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54 // Purpose:
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55 // Description:
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56 //
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57 // This code is part of RedBoot (tm).
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58 //
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59 //####DESCRIPTIONEND####
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60 //
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61 //==========================================================================
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62
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63 #include <redboot.h>
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64
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65 #include <cyg/hal/hal_arch.h>
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66 #include <cyg/hal/hal_if.h>
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67 #include <cyg/hal/hal_intr.h>
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68 #include <cyg/hal/hal_cache.h>
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69
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70 #ifdef CYGPKG_REDBOOT_NETWORKING
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71 #include <net/net.h>
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72 #endif
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73
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74 #ifdef CYGPKG_IO_ETH_DRIVERS
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75 #include <cyg/io/eth/eth_drv.h> // Logical driver interfaces
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76 #endif
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77
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78 #include CYGHWR_MEMORY_LAYOUT_H
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79
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80 #include <cyg/hal/redboot_linux_exec.h>
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81
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82 //=========================================================================
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83
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84 // Exported CLI function(s)
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85 static void do_exec(int argc, char *argv[]);
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86 RedBoot_cmd("exec",
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87 "Execute a Linux image - with MMU off",
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88 "[-w timeout]\n"
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89 " [-c \"kernel command line\"] [<entry_point>]",
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90 do_exec
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91 );
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92
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93 //
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94 // Execute a Linux kernel - this is a RedBoot CLI command
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95 //
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96 static void
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97 do_exec(int argc, char *argv[])
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98 {
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99 unsigned long entry;
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100 bool wait_time_set, cmd_line_set;
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101 int wait_time;
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102 char *cmd_line;
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103 char *cline;
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104 struct option_info opts[2];
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105 hal_virtual_comm_table_t *__chan;
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106 int baud_rate;
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107
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108 bd_t *board_info;
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109 CYG_INTERRUPT_STATE oldints;
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110 unsigned long sp = CYGMEM_REGION_ram+CYGMEM_REGION_ram_SIZE;
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111
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112 init_opts(&opts[0], 'w', true, OPTION_ARG_TYPE_NUM,
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113 (void *)&wait_time, (bool *)&wait_time_set, "wait timeout");
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114 init_opts(&opts[1], 'c', true, OPTION_ARG_TYPE_STR,
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115 (void *)&cmd_line, (bool *)&cmd_line_set, "kernel command line");
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116 entry = entry_address; // Default from last 'load' operation
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117 if (!scan_opts(argc, argv, 1, opts, 2, (void *)&entry, OPTION_ARG_TYPE_NUM,
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118 "[physical] starting address")) {
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119 return;
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120 }
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121 if (entry == (unsigned long)NO_MEMORY) {
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122 diag_printf("Can't execute Linux - invalid entry address\n");
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123 return;
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124 }
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125
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126 // Determine baud rate on current console
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127 __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
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128 baud_rate = CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_GETBAUD);
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129 if (baud_rate <= 0) {
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130 baud_rate = CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD;
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131 }
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132
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133 // Make a little space at the top of the stack, and align to
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134 // 64-bit boundary.
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135 sp = (sp-128) & ~7; // The Linux boot code uses this space for FIFOs
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136
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137 // Copy the commandline onto the stack, and set the SP to just below it.
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138 if (cmd_line_set) {
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139 int len,i;
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140
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141 // get length of string
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142 for( len = 0; cmd_line[len] != '\0'; len++ );
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143
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144 // decrement sp by length of string and align to
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145 // word boundary.
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146 sp = (sp-(len+1)) & ~3;
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147
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148 // assign this SP value to command line start
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149 cline = (char *)sp;
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150
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151 // copy command line over.
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152 for( i = 0; i < len; i++ )
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153 cline[i] = cmd_line[i];
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154 cline[len] = '\0';
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155
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156 } else {
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157 cline = (char *)NULL;
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158 }
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159
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160 // Set up parameter struct at top of stack
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161 sp = sp-sizeof(bd_t);
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162 board_info = (bd_t *)sp;
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163 memset(board_info, sizeof(*board_info), 0);
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164
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165 board_info->bi_tag = 0x42444944;
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166 board_info->bi_size = sizeof(*board_info);
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167 board_info->bi_revision = 1;
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168 board_info->bi_bdate = 0x06012002;
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169 board_info->bi_memstart = CYGMEM_REGION_ram;
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170 board_info->bi_memsize = CYGMEM_REGION_ram_SIZE;
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171 board_info->bi_baudrate = baud_rate;
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172 board_info->bi_cmdline = cline;
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173 #ifdef CYGPKG_REDBOOT_NETWORKING
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174 memcpy(board_info->bi_enetaddr, __local_enet_addr, sizeof(enet_addr_t));
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175 #endif
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176 // Call platform specific code to fill in the platform/architecture specific details
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177 plf_redboot_linux_exec(board_info);
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178
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179 // adjust SP to 64 byte boundary, and leave a little space
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180 // between it and the commandline for PowerPC calling
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181 // conventions.
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182
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183 sp = (sp-64)&~63;
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184
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185 if (wait_time_set) {
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186 int script_timeout_ms = wait_time * 1000;
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187 #ifdef CYGFUN_REDBOOT_BOOT_SCRIPT
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188 unsigned char *hold_script = script;
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189 script = (unsigned char *)0;
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190 #endif
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191 diag_printf("About to start execution at %p - abort with ^C within %d seconds\n",
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192 (void *)entry, wait_time);
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193 while (script_timeout_ms >= CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT) {
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194 int res;
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195 char line[80];
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196 res = _rb_gets(line, sizeof(line), CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT);
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197 if (res == _GETS_CTRLC) {
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198 #ifdef CYGFUN_REDBOOT_BOOT_SCRIPT
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199 script = hold_script; // Re-enable script
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200 #endif
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201 return;
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202 }
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203 script_timeout_ms -= CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT;
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204 }
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205 }
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206
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207 #ifdef CYGPKG_IO_ETH_DRIVERS
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208 eth_drv_stop();
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209 #endif
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210
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211 // Disable interrupts
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212 HAL_DISABLE_INTERRUPTS(oldints);
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213
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214 // Put the caches to sleep.
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215 HAL_DCACHE_SYNC();
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216 HAL_ICACHE_DISABLE();
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217 HAL_DCACHE_DISABLE();
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218 HAL_DCACHE_SYNC();
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219 HAL_ICACHE_INVALIDATE_ALL();
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220 HAL_DCACHE_INVALIDATE_ALL();
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221
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222 // diag_printf("entry %08x, sp %08x, info %08x, cmd line %08x, baud %d\n",
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223 // entry, sp, board_info, cline, baud_rate);
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224 // breakpoint();
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225
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226 // Call into Linux
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227 __asm__ volatile (
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228 // Start by disabling MMU - the mappings are
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229 // 1-1 so this should not cause any problems
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230 "mfmsr 3\n"
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231 "li 4,0xFFFFFFCF\n"
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232 "and 3,3,4\n"
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233 "sync\n"
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234 "mtmsr 3\n"
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235 "sync\n"
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236
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237 // Now set up parameters to jump into linux
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238
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239 "mtlr %0\n" // set entry address in LR
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240 "mr 1,%1\n" // set stack pointer
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241 "mr 3,%2\n" // set board info in R3
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242 "mr 4,%3\n" // set command line in R4
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243 "blr \n" // jump into linux
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244 :
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245 : "r"(entry),"r"(sp),"r"(board_info),"r"(cline)
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246 : "r3", "r4"
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247
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248 );
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249 }
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250
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251 //=========================================================================
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252 // EOF redboot_linux_exec.c