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annotate packages/hal/arm/arch/current/src/redboot_linux_exec.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
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children d2c90368aeef
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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 on ARM platforms
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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 //
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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 version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //####OTHERCOPYRIGHTBEGIN####
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41 //
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42 // The structure definitions below are taken from include/asm-arm/setup.h in
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43 // the Linux kernel, Copyright (C) 1997-1999 Russell King. Their presence
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44 // here is for the express purpose of communication with the Linux kernel
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45 // being booted and is considered 'fair use' by the original author and
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46 // are included with his permission.
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47 //
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48 //####OTHERCOPYRIGHTEND####
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49 //==========================================================================
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50 //#####DESCRIPTIONBEGIN####
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51 //
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52 // Author(s): gthomas
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53 // Contributors: gthomas, jskov,
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54 // Russell King <rmk@arm.linux.org.uk>
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55 // Date: 2001-02-20
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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 <pkgconf/hal.h>
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66 #include <redboot.h>
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67
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68 #include <cyg/hal/hal_intr.h>
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69 #include <cyg/hal/hal_cache.h>
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70 #include CYGHWR_MEMORY_LAYOUT_H
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71
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72 #include <cyg/hal/hal_io.h>
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73
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74 #ifndef CYGARC_PHYSICAL_ADDRESS
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75 # error
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76 # define CYGARC_PHYSICAL_ADDRESS(x) (x)
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77 #endif
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78
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79 // FIXME: This should be a CDL variable, and CYGSEM_REDBOOT_ARM_LINUX_BOOT
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80 // active_if CYGHWR_HAL_ARM_REDBOOT_MACHINE_TYPE>0
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81 #ifdef HAL_PLATFORM_MACHINE_TYPE
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82 #define CYGHWR_REDBOOT_ARM_MACHINE_TYPE HAL_PLATFORM_MACHINE_TYPE
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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 an image - with MMU off",
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88 "[-w timeout] [-b <load addr> [-l <length>]]\n"
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89 " [-r <ramdisk addr> [-s <ramdisk length>]]\n"
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90 " [-c \"kernel command line\"] [<entry_point>]",
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91 do_exec
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92 );
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93
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94 //
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95 // Parameter info for Linux kernel
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96 // ** C A U T I O N ** This setup must match "asm-arm/setup.h"
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97 //
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98 // Info is passed at a fixed location, using a sequence of tagged
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99 // data entries.
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100 //
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101
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102 typedef unsigned long u32;
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103 typedef unsigned short u16;
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104 typedef unsigned char u8;
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105
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106 //=========================================================================
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107 // From Linux <asm-arm/setup.h>
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108
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109 #define ATAG_NONE 0x00000000
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110 struct tag_header {
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111 u32 size; // Size of tag (hdr+data) in *longwords*
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112 u32 tag;
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113 };
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114
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115 #define ATAG_CORE 0x54410001
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116 struct tag_core {
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117 u32 flags; /* bit 0 = read-only */
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118 u32 pagesize;
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119 u32 rootdev;
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120 };
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121
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122 #define ATAG_MEM 0x54410002
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123 struct tag_mem32 {
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124 u32 size;
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125 u32 start;
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126 };
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127
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128 #define ATAG_VIDEOTEXT 0x54410003
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129 struct tag_videotext {
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130 u8 x;
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131 u8 y;
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132 u16 video_page;
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133 u8 video_mode;
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134 u8 video_cols;
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135 u16 video_ega_bx;
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136 u8 video_lines;
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137 u8 video_isvga;
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138 u16 video_points;
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139 };
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140
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141 #define ATAG_RAMDISK 0x54410004
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142 struct tag_ramdisk {
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143 u32 flags; /* b0 = load, b1 = prompt */
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144 u32 size;
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145 u32 start;
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146 };
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147
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148 #define ATAG_INITRD 0x54410005
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149 struct tag_initrd {
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150 u32 start;
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151 u32 size;
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152 };
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153
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154 #define ATAG_SERIAL 0x54410006
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155 struct tag_serialnr {
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156 u32 low;
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157 u32 high;
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158 };
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159
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160 #define ATAG_REVISION 0x54410007
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161 struct tag_revision {
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162 u32 rev;
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163 };
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164
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165 #define ATAG_VIDEOLFB 0x54410008
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166 struct tag_videolfb {
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167 u16 lfb_width;
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168 u16 lfb_height;
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169 u16 lfb_depth;
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170 u16 lfb_linelength;
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171 u32 lfb_base;
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172 u32 lfb_size;
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173 u8 red_size;
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174 u8 red_pos;
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175 u8 green_size;
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176 u8 green_pos;
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177 u8 blue_size;
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178 u8 blue_pos;
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179 u8 rsvd_size;
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180 u8 rsvd_pos;
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181 };
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182
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183 #define ATAG_CMDLINE 0x54410009
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184 struct tag_cmdline {
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185 char cmdline[1];
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186 };
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187
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188 #define ATAG_ACORN 0x41000101
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189 struct tag_acorn {
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190 u32 memc_control_reg;
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191 u32 vram_pages;
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192 u8 sounddefault;
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193 u8 adfsdrives;
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194 };
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195
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196 #define ATAG_MEMCLK 0x41000402
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197 struct tag_memclk {
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198 u32 fmemclk;
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199 };
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200
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201 struct tag {
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202 struct tag_header hdr;
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203 union {
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204 struct tag_core core;
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205 struct tag_mem32 mem;
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206 struct tag_videotext videotext;
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207 struct tag_ramdisk ramdisk;
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208 struct tag_initrd initrd;
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209 struct tag_serialnr serialnr;
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210 struct tag_revision revision;
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211 struct tag_videolfb videolfb;
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212 struct tag_cmdline cmdline;
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213
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214 /*
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215 * Acorn specific
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216 */
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217 struct tag_acorn acorn;
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218
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219 /*
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220 * DC21285 specific
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221 */
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222 struct tag_memclk memclk;
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223 } u;
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224 };
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225
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226 // End of inclusion from <asm-arm/setup.h>
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227 //=========================================================================
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228
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229 // Round up a quantity to a longword (32 bit) length
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230 #define ROUNDUP(n) (((n)+3)&~3)
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231
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232 static void
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233 do_exec(int argc, char *argv[])
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234 {
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235 unsigned long entry;
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236 unsigned long oldints;
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237 bool wait_time_set;
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238 int wait_time, res;
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239 bool base_addr_set, length_set, cmd_line_set;
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240 bool ramdisk_addr_set, ramdisk_size_set;
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241 unsigned long base_addr, length;
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242 unsigned long ramdisk_addr, ramdisk_size;
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243 struct option_info opts[6];
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244 char line[8];
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245 char *cmd_line;
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246 struct tag *params = (struct tag *)0x0100;
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247
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248 entry = (unsigned long)CYGARC_PHYSICAL_ADDRESS(CYGHWR_REDBOOT_ARM_LINUX_EXEC_ADDRESS); // Default Linux execute address
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249 base_addr = load_address;
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250 length = load_address_end - load_address;
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251 ramdisk_size = 4096*1024;
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252 init_opts(&opts[0], 'w', true, OPTION_ARG_TYPE_NUM,
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253 (void **)&wait_time, (bool *)&wait_time_set, "wait timeout");
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254 init_opts(&opts[1], 'b', true, OPTION_ARG_TYPE_NUM,
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255 (void **)&base_addr, (bool *)&base_addr_set, "base address");
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256 init_opts(&opts[2], 'l', true, OPTION_ARG_TYPE_NUM,
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257 (void **)&length, (bool *)&length_set, "length");
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258 init_opts(&opts[3], 'c', true, OPTION_ARG_TYPE_STR,
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259 (void **)&cmd_line, (bool *)&cmd_line_set, "kernel command line");
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260 init_opts(&opts[4], 'r', true, OPTION_ARG_TYPE_NUM,
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261 (void **)&ramdisk_addr, (bool *)&ramdisk_addr_set, "ramdisk_addr");
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262 init_opts(&opts[5], 's', true, OPTION_ARG_TYPE_NUM,
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263 (void **)&ramdisk_size, (bool *)&ramdisk_size_set, "ramdisk_size");
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264 if (!scan_opts(argc, argv, 1, opts, 6, (void *)&entry, OPTION_ARG_TYPE_NUM, "[physical] starting address"))
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265 {
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266 return;
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267 }
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268
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269 // Set up parameters to pass to kernel
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270
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271 // CORE tag must be present & first
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272 params->hdr.size = (sizeof(struct tag_core) + sizeof(struct tag_header))/sizeof(long);
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273 params->hdr.tag = ATAG_CORE;
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274 params->u.core.flags = 0;
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275 params->u.core.pagesize = 0;
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276 params->u.core.rootdev = 0;
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277 params = (struct tag *)((long *)params + params->hdr.size);
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278
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279 /* Next ATAG_MEM. */
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280 params->hdr.size = (sizeof(struct tag_mem32) + sizeof(struct tag_header))/sizeof(long);
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281 params->hdr.tag = ATAG_MEM;
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282 params->u.mem.start = CYGARC_PHYSICAL_ADDRESS(CYGMEM_REGION_ram);
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283 /* Round up so there's only one bit set in the memory size.
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284 * Don't double it if it's already a power of two, though.
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285 */
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286 params->u.mem.size = 1<<hal_msbindex(CYGMEM_REGION_ram_SIZE);
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287 if (params->u.mem.size < CYGMEM_REGION_ram_SIZE << 1)
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288 params->u.mem.size <<= 1;
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289 params = (struct tag *)((long *)params + params->hdr.size);
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290
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291 if (ramdisk_addr_set) {
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292 params->hdr.size = (sizeof(struct tag_initrd) + sizeof(struct tag_header))/sizeof(long);
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293 params->hdr.tag = ATAG_INITRD;
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294 params->u.initrd.start = CYGARC_PHYSICAL_ADDRESS(ramdisk_addr);
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295 params->u.initrd.size = ramdisk_size;
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296 params = (struct tag *)((long *)params + params->hdr.size);
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297 }
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298 if (cmd_line_set) {
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299 params->hdr.size = (ROUNDUP(strlen(cmd_line)) + sizeof(struct tag_header))/sizeof(long);
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300 params->hdr.tag = ATAG_CMDLINE;
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301 strcpy(params->u.cmdline.cmdline, cmd_line);
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302 params = (struct tag *)((long *)params + params->hdr.size);
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303 }
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304 // Mark end of parameter list
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305 params->hdr.size = 0;
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306 params->hdr.tag = ATAG_NONE;
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307
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308 if (wait_time_set) {
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309 int script_timeout_ms = wait_time * 1000;
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310 #ifdef CYGFUN_REDBOOT_BOOT_SCRIPT
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311 unsigned char *hold_script = script;
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312 script = (unsigned char *)0;
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313 #endif
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314 diag_printf("About to start execution at %p - abort with ^C within %d seconds\n",
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315 (void *)entry, wait_time);
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316 while (script_timeout_ms >= CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT) {
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317 res = _rb_gets(line, sizeof(line), CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT);
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318 if (res == _GETS_CTRLC) {
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319 #ifdef CYGFUN_REDBOOT_BOOT_SCRIPT
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320 script = hold_script; // Re-enable script
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321 #endif
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322 return;
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323 }
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324 script_timeout_ms -= CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT;
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325 }
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326 }
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327 if (!base_addr_set) {
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328 diag_printf("Using base address %p and length %p\n",
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329 (void*)base_addr, (void*)length);
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330 } else if (base_addr_set && !length_set) {
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331 diag_printf("Length required for non-standard base address\n");
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332 return;
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333 }
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334 HAL_DISABLE_INTERRUPTS(oldints);
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335 HAL_DCACHE_SYNC();
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336 HAL_ICACHE_DISABLE();
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337 HAL_DCACHE_DISABLE();
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338 HAL_DCACHE_SYNC();
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339 HAL_ICACHE_INVALIDATE_ALL();
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340 HAL_DCACHE_INVALIDATE_ALL();
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341
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342 // Tricky code. We are currently running with the MMU on and the
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343 // memory map convoluted from 1-1. The trampoline code between
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344 // labels 1 and 2 must be copied to RAM and then executed at the
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345 // non-mapped address. Then when the code turns off the MMU, the
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346 // control flow is unchanged and control can be passed safely to
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347 // the program to be executed.
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348 // Note: This only works if phys=virt (or there are appropriate
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349 // double mapping of the memory). This should be rewritten
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350 // so a jump follows immediately after the MMU disable
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351 // operation.
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352 //
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353 // This magic was created in order to
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354 // be able to execute standard Linux kernels with as little
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355 // change/perturberance as possible.
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356 asm volatile ("\n" // Copy code between labels 1-2 to the
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357 " ldr r2,=1f;\n" // trampoline address...
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358 " ldr r3,=2f;\n"
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359 " mov r5,%0;\n"
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360 "4:\n"
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361 " ldr r1,[r2],#4;\n"
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362 " str r1,[r5],#4;\n"
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363 " cmp r2,r3;\n"
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364 " bne 4b;\n"
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365 " nop;nop;nop;nop;nop;nop;nop;nop;\n"
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366 " mov r5,%1;\n"
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367 " mov r2,%2;\n"
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368 " mov r3,%3;\n"
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369 " mov r7,%4;\n"
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370 " mov r6,%5;\n"
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371 " mov pc,%0;\n" //... and jump to it.
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372 " \n"
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373 "1:\n"
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374 " mrs r1,cpsr;\n" // Put processor in IRQ mode
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375 " bic r0,r1,#0x1F;\n"
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diff changeset
376 " orr r0,r0,#0x12;\n"
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diff changeset
377 " msr cpsr,r0;\n"
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diff changeset
378 " msr spsr,r1;\n"
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379 " mov lr,r5;\n" // Set kernel entry point
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380 " mov sp,r5;\n" // Give the kernel a stack just below the entry point
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381 " mov r1,#0;\n" // Turn off MMU and caches
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382 " mcr p15,0,r1,c1,c0;\n"
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383 " nop;nop;nop;\n"
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384 " cmp r2,r6;\n" // Default kernel load address. Relocate
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385 " beq 10f;\n" // kernel image there if necessary, and
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386 " cmp r3,#0;\n" // if size is non-zero
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387 " beq 10f;\n"
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diff changeset
388 "05:\n"
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389 " ldr r4,[r2],#4;\n"
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diff changeset
390 " str r4,[r6],#4;\n"
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diff changeset
391 " sub r3,r3,#4;\n"
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diff changeset
392 " cmp r3,#0;\n"
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393 " bne 05b;\n"
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394 "10:\n"
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395 " mov r0,#0;\n" // Set board type and start the kernel
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396 " mov r1,r7;\n"
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diff changeset
397 " movs pc,lr;\n"
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398 "2:\n"
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399 : :
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400 "r"(CYGARC_PHYSICAL_ADDRESS(CYGHWR_REDBOOT_ARM_TRAMPOLINE_ADDRESS)),
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401 "r"(entry),
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402 "r"(CYGARC_PHYSICAL_ADDRESS(base_addr)),
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403 "r"(length),
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404 "r"(CYGHWR_REDBOOT_ARM_MACHINE_TYPE),
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405 "r"(CYGHWR_REDBOOT_ARM_LINUX_EXEC_ADDRESS) :
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406 "r7","r6","r5","r2","r3","r1");
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407 }
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408
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409 #endif // HAL_PLATFORM_MACHINE_TYPE - otherwise we do not support this stuff...
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410
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411 // EOF redboot_linux_exec.c