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1 //========================================================================== |
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2 // |
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3 // redboot_linux_boot.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 Red Hat, Inc. |
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12 // Copyright (C) 2002 Gary Thomas |
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13 // |
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14 // eCos is free software; you can redistribute it and/or modify it under |
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15 // the terms of the GNU General Public License as published by the Free |
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16 // Software Foundation; either version 2 or (at your option) any later version. |
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17 // |
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY |
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19 // 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 along |
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24 // with eCos; if not, write to the Free Software Foundation, Inc., |
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25 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
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26 // |
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27 // As a special exception, if other files instantiate templates or use macros |
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28 // or inline functions from this file, or you compile this file and link it |
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29 // with other works to produce a work based on this file, this file does not |
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30 // by itself cause the resulting work to be covered by the GNU General Public |
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31 // License. However the source code for this file must still be made available |
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32 // in accordance with section (3) of the GNU General Public License. |
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33 // |
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34 // This exception does not invalidate any other reasons why a work based on |
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35 // this file might be covered by the GNU General Public License. |
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36 // |
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37 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. |
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38 // at http://sources.redhat.com/ecos/ecos-license/ |
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39 // ------------------------------------------- |
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40 //####ECOSGPLCOPYRIGHTEND#### |
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41 //####OTHERCOPYRIGHTBEGIN#### |
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42 // |
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43 // The structure definitions below are taken from include/ppc/platforms/am860.h in |
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44 // the Linux kernel, Copyright (c) 2002 Gary Thomas, Copyright (c) 1997 Dan Malek. |
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45 // Their presence here is for the express purpose of communication with the Linux |
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46 // kernel being booted and is considered 'fair use' by the original author and |
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47 // are included with their permission. |
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48 // |
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49 //####OTHERCOPYRIGHTEND#### |
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50 //========================================================================== |
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51 //#####DESCRIPTIONBEGIN#### |
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52 // |
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53 // Author(s): msalter |
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54 // Contributors: gthomas,msalter |
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55 // Date: 2002-01-14 |
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56 // Purpose: |
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57 // Description: |
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58 // |
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59 // This code is part of RedBoot (tm). |
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60 // |
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61 //####DESCRIPTIONEND#### |
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62 // |
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63 //========================================================================== |
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64 |
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65 #include <redboot.h> |
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66 #include <pkgconf/hal_powerpc_quicc.h> |
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67 |
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68 #include <cyg/hal/hal_arch.h> |
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69 #include <cyg/hal/hal_if.h> |
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70 #include <cyg/hal/hal_intr.h> |
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71 #include <cyg/hal/hal_cache.h> |
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72 |
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73 #ifdef CYGPKG_REDBOOT_NETWORKING |
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74 #include <net/net.h> |
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75 #endif |
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76 |
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77 #ifdef CYGSEM_REDBOOT_HAL_LINUX_BOOT |
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78 |
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79 #include CYGHWR_MEMORY_LAYOUT_H |
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80 |
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81 //========================================================================= |
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82 |
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83 // Exported CLI function(s) |
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84 static void do_exec(int argc, char *argv[]); |
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85 RedBoot_cmd("exec", |
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86 "Execute a Linux image - with MMU off", |
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87 "[-w timeout]\n" |
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88 " [-c \"kernel command line\"] [<entry_point>]", |
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89 do_exec |
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90 ); |
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91 |
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92 //========================================================================= |
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93 // Imported from Linux kernel include/asm-ppc/am860.h |
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94 // Copyright (c) 2002 Gary Thomas (gary@chez-thomas.org) |
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95 // Copyright (c) 1997 Dan Malek (dmalek@jlc.net) |
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96 // Used with permission of author(s). |
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97 |
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98 |
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99 /* A Board Information structure that is given to a program when |
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100 * RedBoot starts it up. |
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101 */ |
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102 typedef struct bd_info { |
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103 unsigned int bi_tag; /* Should be 0x42444944 "BDID" */ |
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104 unsigned int bi_size; /* Size of this structure */ |
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105 unsigned int bi_revision; /* revision of this structure */ |
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106 unsigned int bi_bdate; /* EPPCbug date, i.e. 0x11061997 */ |
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107 unsigned int bi_memstart; /* Memory start address */ |
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108 unsigned int bi_memsize; /* Memory (end) size in bytes */ |
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109 unsigned int bi_intfreq; /* Internal Freq, in Hz */ |
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110 unsigned int bi_busfreq; /* Bus Freq, in Hz */ |
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111 unsigned int bi_clun; /* Boot device controller */ |
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112 unsigned int bi_dlun; /* Boot device logical dev */ |
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113 unsigned char bi_enetaddr[6]; |
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114 unsigned int bi_baudrate; |
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115 unsigned char *bi_cmdline; |
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116 } bd_t; |
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117 |
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118 // |
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119 // Execute a Linux kernel - this is a RedBoot CLI command |
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120 // |
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121 static void |
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122 do_exec(int argc, char *argv[]) |
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123 { |
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124 unsigned long entry; |
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125 bool wait_time_set, cmd_line_set; |
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126 int wait_time; |
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127 char *cmd_line; |
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128 char *cline; |
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129 struct option_info opts[2]; |
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130 hal_virtual_comm_table_t *__chan; |
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131 int baud_rate; |
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132 |
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133 bd_t *board_info; |
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134 CYG_INTERRUPT_STATE oldints; |
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135 unsigned long sp = CYGMEM_REGION_ram+CYGMEM_REGION_ram_SIZE; |
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136 |
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137 init_opts(&opts[0], 'w', true, OPTION_ARG_TYPE_NUM, |
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138 (void **)&wait_time, (bool *)&wait_time_set, "wait timeout"); |
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139 init_opts(&opts[1], 'c', true, OPTION_ARG_TYPE_STR, |
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140 (void **)&cmd_line, (bool *)&cmd_line_set, "kernel command line"); |
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141 entry = entry_address; // Default from last 'load' operation |
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142 if (!scan_opts(argc, argv, 1, opts, 2, (void *)&entry, OPTION_ARG_TYPE_NUM, |
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143 "[physical] starting address")) { |
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144 return; |
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145 } |
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146 |
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147 // Determine baud rate on current console |
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148 __chan = CYGACC_CALL_IF_CONSOLE_PROCS(); |
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149 baud_rate = CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_GETBAUD); |
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150 if (baud_rate <= 0) { |
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151 baud_rate = CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD; |
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152 } |
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153 |
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154 // Make a little space at the top of the stack, and align to |
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155 // 64-bit boundary. |
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156 sp = (sp-128) & ~7; // The Linux boot code uses this space for FIFOs |
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157 |
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158 // Copy the commandline onto the stack, and set the SP to just below it. |
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159 if (cmd_line_set) { |
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160 int len,i; |
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161 |
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162 // get length of string |
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163 for( len = 0; cmd_line[len] != '\0'; len++ ); |
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164 |
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165 // decrement sp by length of string and align to |
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166 // word boundary. |
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167 sp = (sp-(len+1)) & ~3; |
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168 |
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169 // assign this SP value to command line start |
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170 cline = (char *)sp; |
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171 |
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172 // copy command line over. |
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173 for( i = 0; i < len; i++ ) |
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174 cline[i] = cmd_line[i]; |
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175 cline[len] = '\0'; |
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176 |
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177 } else { |
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178 cline = (char *)NULL; |
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179 } |
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180 |
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181 // Set up parameter struct at top of stack |
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182 sp = sp-sizeof(bd_t); |
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183 board_info = (bd_t *)sp; |
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184 memset(board_info, sizeof(*board_info), 0); |
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185 |
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186 board_info->bi_tag = 0x42444944; |
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187 board_info->bi_size = sizeof(board_info); |
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188 board_info->bi_revision = 1; |
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189 board_info->bi_bdate = 0x06012002; |
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190 board_info->bi_memstart = CYGMEM_REGION_ram; |
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191 board_info->bi_memsize = CYGMEM_REGION_ram_SIZE; |
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192 board_info->bi_intfreq = CYGHWR_HAL_POWERPC_BOARD_SPEED*1000000; |
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193 board_info->bi_busfreq = 66*1000000; |
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194 board_info->bi_clun = 0; // ???? |
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195 board_info->bi_dlun = 0; // ???? |
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196 board_info->bi_baudrate = baud_rate; |
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197 board_info->bi_cmdline = cline; |
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198 #ifdef CYGPKG_REDBOOT_NETWORKING |
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199 memcpy(board_info->bi_enetaddr, __local_enet_addr, sizeof(enet_addr_t)); |
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200 #endif |
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201 |
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202 // adjust SP to 64 bit boundary, and leave a little space |
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203 // between it and the commandline for PowerPC calling |
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204 // conventions. |
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205 |
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206 sp = (sp-32)&~7; |
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207 |
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208 if (wait_time_set) { |
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209 int script_timeout_ms = wait_time * 1000; |
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210 #ifdef CYGFUN_REDBOOT_BOOT_SCRIPT |
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211 unsigned char *hold_script = script; |
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212 script = (unsigned char *)0; |
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213 #endif |
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214 diag_printf("About to start execution at %p - abort with ^C within %d seconds\n", |
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215 (void *)entry, wait_time); |
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216 while (script_timeout_ms >= CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT) { |
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217 int res; |
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218 char line[80]; |
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219 res = _rb_gets(line, sizeof(line), CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT); |
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220 if (res == _GETS_CTRLC) { |
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221 #ifdef CYGFUN_REDBOOT_BOOT_SCRIPT |
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222 script = hold_script; // Re-enable script |
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223 #endif |
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224 return; |
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225 } |
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226 script_timeout_ms -= CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT; |
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227 } |
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228 } |
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229 |
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230 // Disable interrupts |
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231 HAL_DISABLE_INTERRUPTS(oldints); |
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232 |
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233 // Put the caches to sleep. |
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234 HAL_DCACHE_SYNC(); |
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235 HAL_ICACHE_DISABLE(); |
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236 HAL_DCACHE_DISABLE(); |
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237 HAL_DCACHE_SYNC(); |
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238 HAL_ICACHE_INVALIDATE_ALL(); |
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239 HAL_DCACHE_INVALIDATE_ALL(); |
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240 |
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241 // diag_printf("entry %08x, sp %08x, info %08x, cmd line %08x, baud %d\n", |
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242 // entry, sp, board_info, cline, baud_rate); |
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243 // breakpoint(); |
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244 |
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245 // Call into Linux |
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246 __asm__ volatile ( |
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247 // Start by disabling MMU - the mappings are |
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248 // 1-1 so this should not cause any problems |
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249 "mfmsr 3\n" |
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250 "li 4,0xFFFFFFCF\n" |
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251 "and 3,3,4\n" |
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252 "sync\n" |
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253 "mtmsr 3\n" |
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254 "sync\n" |
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255 |
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256 // Now set up parameters to jump into linux |
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257 |
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258 "mtlr %0\n" // set entry address in LR |
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259 "mr 1,%1\n" // set stack pointer |
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260 "mr 3,%2\n" // set board info in R3 |
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261 "mr 4,%3\n" // set command line in R4 |
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262 "blr \n" // jump into linux |
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263 : |
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264 : "r"(entry),"r"(sp),"r"(board_info),"r"(cline) |
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265 : "r3", "r4" |
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266 |
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267 ); |
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268 } |
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269 |
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270 #endif // CYGSEM_REDBOOT_HAL_LINUX_BOOT |
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271 |
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272 //========================================================================= |
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273 // EOF redboot_linux_exec.c |
