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annotate packages/hal/arm/arch/current/src/redboot_linux_exec.c @ 1742:aaa68fc7d7f9

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Add -x option to ARM RedBoot exec command
author msalter
date Thu, 02 Sep 2004 16:30:51 +0000
parents 30d12b1c7bb0
children 72c130f0a30d
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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, 2003, 2004 Red Hat, Inc.
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12 // Copyright (C) 2003, 2004 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/asm-arm/setup.h in
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44 // the Linux kernel, Copyright (C) 1997-1999 Russell King. Their presence
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45 // here is for the express purpose of communication with the Linux kernel
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46 // being booted and is considered 'fair use' by the original author and
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47 // are included with his 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): gthomas
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54 // Contributors: gthomas, jskov,
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55 // Russell King <rmk@arm.linux.org.uk>
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56 // Date: 2001-02-20
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57 // Purpose:
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58 // Description:
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59 //
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60 // This code is part of RedBoot (tm).
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61 //
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62 //####DESCRIPTIONEND####
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63 //
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64 //==========================================================================
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65
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66 #include <pkgconf/hal.h>
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67 #include <redboot.h>
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68
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69 #ifdef CYGPKG_IO_ETH_DRIVERS
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70 #include <cyg/io/eth/eth_drv.h> // Logical driver interfaces
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71 #endif
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72
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73 #include <cyg/hal/hal_intr.h>
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74 #include <cyg/hal/hal_cache.h>
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75 #include CYGHWR_MEMORY_LAYOUT_H
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76
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77 #include <cyg/hal/hal_io.h>
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78
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79 #ifndef CYGARC_PHYSICAL_ADDRESS
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80 # error
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81 # define CYGARC_PHYSICAL_ADDRESS(x) (x)
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82 #endif
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83
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84 // FIXME: This should be a CDL variable, and CYGSEM_REDBOOT_ARM_LINUX_BOOT
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85 // active_if CYGHWR_HAL_ARM_REDBOOT_MACHINE_TYPE>0
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86 #ifdef HAL_PLATFORM_MACHINE_TYPE
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87 #define CYGHWR_REDBOOT_ARM_MACHINE_TYPE HAL_PLATFORM_MACHINE_TYPE
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88
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89 // Exported CLI function(s)
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90 static void do_exec(int argc, char *argv[]);
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91 RedBoot_cmd("exec",
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92 "Execute an image - with MMU off",
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93 "[-w timeout] [-b <load addr> [-l <length>]]\n"
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94 " [-r <ramdisk addr> [-s <ramdisk length>]]\n"
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95 " [-c \"kernel command line\"] [<entry_point>]",
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96 do_exec
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97 );
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98
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99 // CYGARC_HAL_MMU_OFF inserts code to turn off MMU and jump to a physical
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100 // address. Some ARM implementations may need special handling and define
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101 // their own version.
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102 #ifndef CYGARC_HAL_MMU_OFF
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103
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104 #define __CYGARC_GET_CTLREG \
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105 " mrc p15,0,r0,c1,c0,0\n"
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106
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107 #define __CYGARC_CLR_MMU_BITS \
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108 " bic r0,r0,#0xd\n" \
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109 " bic r0,r0,#0x1000\n" \
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110
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111 #ifdef CYGHWR_HAL_ARM_BIGENDIAN
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112 #define __CYGARC_CLR_MMU_BITS_X \
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113 " bic r0,r0,#0x8d\n" \
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114 " bic r0,r0,#0x1000\n"
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115 #else
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116 #define __CYGARC_CLR_MMU_BITS_X \
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117 " bic r0,r0,#0xd\n" \
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118 " bic r0,r0,#0x1000\n" \
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119 " orr r0,r0,#0x80\n"
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120 #endif
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121
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122 #define __CYGARC_SET_CTLREG(__paddr__) \
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123 " mcr p15,0,r0,c1,c0,0\n" \
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124 " mov pc," #__paddr__ "\n"
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125
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126 #define CYGARC_HAL_MMU_OFF(__paddr__) \
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127 " mcr p15,0,r0,c7,c10,4\n" \
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128 " mcr p15,0,r0,c7,c7,0\n" \
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129 __CYGARC_GET_CTLREG \
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130 __CYGARC_CLR_MMU_BITS \
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131 __CYGARC_SET_CTLREG(__paddr__)
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132
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133 #define CYGARC_HAL_MMU_OFF_X(__paddr__) \
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134 " mcr p15,0,r0,c7,c10,4\n" \
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135 " mcr p15,0,r0,c7,c7,0\n" \
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136 __CYGARC_GET_CTLREG \
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137 __CYGARC_CLR_MMU_BITS_X \
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138 __CYGARC_SET_CTLREG(__paddr__)
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139
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140 #endif // CYGARC_HAL_MMU_OFF
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141
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142 //
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143 // Parameter info for Linux kernel
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144 // ** C A U T I O N ** This setup must match "asm-arm/setup.h"
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145 //
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146 // Info is passed at a fixed location, using a sequence of tagged
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147 // data entries.
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148 //
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149
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150 typedef unsigned long u32;
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151 typedef unsigned short u16;
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152 typedef unsigned char u8;
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153
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154 //=========================================================================
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155 // From Linux <asm-arm/setup.h>
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156
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157 #define ATAG_NONE 0x00000000
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158 struct tag_header {
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159 u32 size; // Size of tag (hdr+data) in *longwords*
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160 u32 tag;
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161 };
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162
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163 #define ATAG_CORE 0x54410001
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164 struct tag_core {
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165 u32 flags; /* bit 0 = read-only */
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166 u32 pagesize;
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167 u32 rootdev;
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168 };
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169
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170 #define ATAG_MEM 0x54410002
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171 struct tag_mem32 {
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172 u32 size;
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173 u32 start;
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174 };
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175
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176 #define ATAG_VIDEOTEXT 0x54410003
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177 struct tag_videotext {
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178 u8 x;
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179 u8 y;
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180 u16 video_page;
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181 u8 video_mode;
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182 u8 video_cols;
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183 u16 video_ega_bx;
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184 u8 video_lines;
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185 u8 video_isvga;
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186 u16 video_points;
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187 };
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188
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189 #define ATAG_RAMDISK 0x54410004
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190 struct tag_ramdisk {
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191 u32 flags; /* b0 = load, b1 = prompt */
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192 u32 size;
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193 u32 start;
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194 };
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195
498
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196 /*
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197 * this one accidentally used virtual addresses - as such,
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198 * its deprecated.
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199 */
208
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200 #define ATAG_INITRD 0x54410005
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201
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202 /* describes where the compressed ramdisk image lives (physical address) */
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203 #define ATAG_INITRD2 0x54420005
208
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204 struct tag_initrd {
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205 u32 start;
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206 u32 size;
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207 };
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208
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209 #define ATAG_SERIAL 0x54410006
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210 struct tag_serialnr {
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211 u32 low;
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212 u32 high;
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213 };
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214
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215 #define ATAG_REVISION 0x54410007
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216 struct tag_revision {
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217 u32 rev;
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218 };
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219
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220 #define ATAG_VIDEOLFB 0x54410008
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221 struct tag_videolfb {
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222 u16 lfb_width;
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223 u16 lfb_height;
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224 u16 lfb_depth;
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225 u16 lfb_linelength;
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226 u32 lfb_base;
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227 u32 lfb_size;
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228 u8 red_size;
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229 u8 red_pos;
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230 u8 green_size;
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231 u8 green_pos;
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232 u8 blue_size;
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233 u8 blue_pos;
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234 u8 rsvd_size;
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235 u8 rsvd_pos;
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236 };
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237
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238 #define ATAG_CMDLINE 0x54410009
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239 struct tag_cmdline {
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240 char cmdline[1];
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241 };
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242
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243 #define ATAG_ACORN 0x41000101
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244 struct tag_acorn {
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245 u32 memc_control_reg;
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246 u32 vram_pages;
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247 u8 sounddefault;
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248 u8 adfsdrives;
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249 };
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250
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251 #define ATAG_MEMCLK 0x41000402
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252 struct tag_memclk {
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253 u32 fmemclk;
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254 };
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255
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256 struct tag {
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257 struct tag_header hdr;
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258 union {
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259 struct tag_core core;
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260 struct tag_mem32 mem;
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261 struct tag_videotext videotext;
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262 struct tag_ramdisk ramdisk;
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263 struct tag_initrd initrd;
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264 struct tag_serialnr serialnr;
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265 struct tag_revision revision;
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266 struct tag_videolfb videolfb;
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267 struct tag_cmdline cmdline;
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268
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269 /*
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270 * Acorn specific
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271 */
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272 struct tag_acorn acorn;
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273
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274 /*
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275 * DC21285 specific
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276 */
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277 struct tag_memclk memclk;
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278 } u;
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279 };
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280
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281 // End of inclusion from <asm-arm/setup.h>
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282 //=========================================================================
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283
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284 // Default memory layout - can be overridden by platform, typically in
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285 // <cyg/hal/plf_io.h>
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286 #ifndef CYGHWR_REDBOOT_LINUX_ATAG_MEM
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287 #define CYGHWR_REDBOOT_LINUX_ATAG_MEM(_p_) \
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288 CYG_MACRO_START \
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289 /* Next ATAG_MEM. */ \
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290 _p_->hdr.size = (sizeof(struct tag_mem32) + sizeof(struct tag_header))/sizeof(long); \
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291 _p_->hdr.tag = ATAG_MEM; \
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292 /* Round up so there's only one bit set in the memory size. \
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293 * Don't double it if it's already a power of two, though. \
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294 */ \
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295 _p_->u.mem.size = 1<<hal_msbindex(CYGMEM_REGION_ram_SIZE); \
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296 if (_p_->u.mem.size < CYGMEM_REGION_ram_SIZE) \
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297 _p_->u.mem.size <<= 1; \
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298 _p_->u.mem.start = CYGARC_PHYSICAL_ADDRESS(CYGMEM_REGION_ram); \
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299 CYG_MACRO_END
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300 #endif
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301
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302
208
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303 // Round up a quantity to a longword (32 bit) length
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304 #define ROUNDUP(n) (((n)+3)&~3)
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305
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306 static void
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307 do_exec(int argc, char *argv[])
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308 {
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309 unsigned long entry;
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310 unsigned long oldints;
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311 bool wait_time_set;
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312 int wait_time, res, num_opts;
208
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313 bool base_addr_set, length_set, cmd_line_set;
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314 bool ramdisk_addr_set, ramdisk_size_set;
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315 unsigned long base_addr, length;
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316 unsigned long ramdisk_addr, ramdisk_size;
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317 struct option_info opts[7];
208
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318 char line[8];
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319 char *cmd_line;
212
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320 struct tag *params = (struct tag *)CYGHWR_REDBOOT_ARM_LINUX_TAGS_ADDRESS;
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321 #ifdef CYGHWR_REDBOOT_LINUX_EXEC_X_SWITCH
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322 bool swap_endian;
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323 extern char __xtramp_start__[], __xtramp_end__[];
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324 #endif
212
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325 extern char __tramp_start__[], __tramp_end__[];
208
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326
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327 // Check to see if a valid image has been loaded
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328 if (entry_address == (unsigned long)NO_MEMORY) {
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329 diag_printf("Can't execute Linux - invalid entry address\n");
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330 return;
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331 }
212
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332 // Default physical entry point for Linux is kernel base.
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333 entry = (unsigned long)CYGHWR_REDBOOT_ARM_LINUX_EXEC_ADDRESS;
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334
208
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335 base_addr = load_address;
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336 length = load_address_end - load_address;
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337 // Round length up to the next quad word
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338 length = (length + 3) & ~0x3;
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339
208
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340 ramdisk_size = 4096*1024;
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341 init_opts(&opts[0], 'w', true, OPTION_ARG_TYPE_NUM,
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342 (void **)&wait_time, (bool *)&wait_time_set, "wait timeout");
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343 init_opts(&opts[1], 'b', true, OPTION_ARG_TYPE_NUM,
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344 (void **)&base_addr, (bool *)&base_addr_set, "base address");
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345 init_opts(&opts[2], 'l', true, OPTION_ARG_TYPE_NUM,
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346 (void **)&length, (bool *)&length_set, "length");
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347 init_opts(&opts[3], 'c', true, OPTION_ARG_TYPE_STR,
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348 (void **)&cmd_line, (bool *)&cmd_line_set, "kernel command line");
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349 init_opts(&opts[4], 'r', true, OPTION_ARG_TYPE_NUM,
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350 (void **)&ramdisk_addr, (bool *)&ramdisk_addr_set, "ramdisk_addr");
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351 init_opts(&opts[5], 's', true, OPTION_ARG_TYPE_NUM,
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352 (void **)&ramdisk_size, (bool *)&ramdisk_size_set, "ramdisk_size");
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353 num_opts = 6;
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354 #ifdef CYGHWR_REDBOOT_LINUX_EXEC_X_SWITCH
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355 init_opts(&opts[6], 'x', false, OPTION_ARG_TYPE_FLG,
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356 (void **)&swap_endian, 0, "swap endianess");
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357 ++num_opts;
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358 #endif
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359 if (!scan_opts(argc, argv, 1, opts, num_opts, (void *)&entry, OPTION_ARG_TYPE_NUM, "[physical] starting address"))
208
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360 {
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361 return;
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362 }
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363
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364 // Set up parameters to pass to kernel
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365
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366 // CORE tag must be present & first
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367 params->hdr.size = (sizeof(struct tag_core) + sizeof(struct tag_header))/sizeof(long);
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368 params->hdr.tag = ATAG_CORE;
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369 params->u.core.flags = 0;
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370 params->u.core.pagesize = 0;
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371 params->u.core.rootdev = 0;
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372 params = (struct tag *)((long *)params + params->hdr.size);
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373
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374 // Fill in the details of the memory layout
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375 CYGHWR_REDBOOT_LINUX_ATAG_MEM(params);
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376
208
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377 params = (struct tag *)((long *)params + params->hdr.size);
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378 if (ramdisk_addr_set) {
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379 params->hdr.size = (sizeof(struct tag_initrd) + sizeof(struct tag_header))/sizeof(long);
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380 params->hdr.tag = ATAG_INITRD2;
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381 params->u.initrd.start = CYGARC_PHYSICAL_ADDRESS(ramdisk_addr);
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382 params->u.initrd.size = ramdisk_size;
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383 params = (struct tag *)((long *)params + params->hdr.size);
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384 }
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385 if (cmd_line_set) {
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386 params->hdr.size = (ROUNDUP(strlen(cmd_line)) + sizeof(struct tag_header))/sizeof(long);
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387 params->hdr.tag = ATAG_CMDLINE;
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388 strcpy(params->u.cmdline.cmdline, cmd_line);
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389 params = (struct tag *)((long *)params + params->hdr.size);
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390 }
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391 // Mark end of parameter list
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392 params->hdr.size = 0;
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393 params->hdr.tag = ATAG_NONE;
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394
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395 if (wait_time_set) {
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396 int script_timeout_ms = wait_time * 1000;
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397 #ifdef CYGFUN_REDBOOT_BOOT_SCRIPT
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398 unsigned char *hold_script = script;
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399 script = (unsigned char *)0;
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400 #endif
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401 diag_printf("About to start execution at %p - abort with ^C within %d seconds\n",
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402 (void *)entry, wait_time);
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403 while (script_timeout_ms >= CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT) {
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404 res = _rb_gets(line, sizeof(line), CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT);
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405 if (res == _GETS_CTRLC) {
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406 #ifdef CYGFUN_REDBOOT_BOOT_SCRIPT
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407 script = hold_script; // Re-enable script
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408 #endif
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409 return;
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410 }
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411 script_timeout_ms -= CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT;
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412 }
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413 }
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414 if (!base_addr_set) {
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415 if ((base_addr == 0) || (length == 0)) {
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416 // Probably not valid - don't try it
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417 diag_printf("Base address unknown - use \"-b\" option\n");
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418 return;
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419 }
208
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420 diag_printf("Using base address %p and length %p\n",
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421 (void*)base_addr, (void*)length);
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422 } else if (base_addr_set && !length_set) {
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423 diag_printf("Length required for non-standard base address\n");
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424 return;
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425 }
821
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426
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427 #ifdef CYGPKG_IO_ETH_DRIVERS
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428 eth_drv_stop();
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429 #endif
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430
208
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431 HAL_DISABLE_INTERRUPTS(oldints);
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432 HAL_DCACHE_SYNC();
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433 HAL_ICACHE_DISABLE();
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434 HAL_DCACHE_DISABLE();
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435 HAL_DCACHE_SYNC();
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436 HAL_ICACHE_INVALIDATE_ALL();
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437 HAL_DCACHE_INVALIDATE_ALL();
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438
212
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439 // Tricky code. We are currently running with the MMU on and the
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440 // memory map possibly convoluted from 1-1. The trampoline code
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441 // between labels __tramp_start__ and __tramp_end__ must be copied
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442 // to RAM and then executed at the non-mapped address.
208
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443 //
212
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444 // This magic was created in order to be able to execute standard
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445 // Linux kernels with as little change/perturberance as possible.
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446
1742
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447 #ifdef CYGHWR_REDBOOT_LINUX_EXEC_X_SWITCH
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448 if (swap_endian) {
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449 // copy the trampline code
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450 memcpy((char *)CYGHWR_REDBOOT_ARM_TRAMPOLINE_ADDRESS,
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451 __xtramp_start__,
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452 __xtramp_end__ - __xtramp_start__);
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453
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454 asm volatile (
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455 CYGARC_HAL_MMU_OFF_X(%5)
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456 "__xtramp_start__:\n"
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457 " cmp %1,%4;\n" // Default kernel load address. Relocate
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458 " beq 2f;\n" // kernel image there if necessary, and
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459 " cmp %2,#0;\n" // if size is non-zero
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460 " beq 2f;\n"
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461 "1:\n"
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462 " ldr r0,[%1],#4;\n"
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463 " eor %5, r0, r0, ror #16;\n"
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464 " bic %5, %5, #0x00ff0000;\n"
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465 " mov r0, r0, ror #8;\n"
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466 " eor r0, r0, %5, lsr #8;\n"
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467 " str r0,[%4],#4;\n"
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468 " subs %2,%2,#4;\n"
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469 " bne 1b;\n"
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470 "2:\n"
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471 " mov r0,#0;\n" // Set board type
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472 " mov r1,%3;\n" // Machine type
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473 " mov r2,%6;\n" // Kernel parameters
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474 " mov pc,%0;\n" // Jump to kernel
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475 "__xtramp_end__:\n"
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476 : :
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477 "r"(entry),
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478 "r"(CYGARC_PHYSICAL_ADDRESS(base_addr)),
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479 "r"(length),
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480 "r"(CYGHWR_REDBOOT_ARM_MACHINE_TYPE),
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481 "r"(CYGHWR_REDBOOT_ARM_LINUX_EXEC_ADDRESS),
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482 "r"(CYGARC_PHYSICAL_ADDRESS(CYGHWR_REDBOOT_ARM_TRAMPOLINE_ADDRESS)),
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483 "r"(CYGARC_PHYSICAL_ADDRESS(CYGHWR_REDBOOT_ARM_LINUX_TAGS_ADDRESS))
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484 : "r0", "r1"
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485 );
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486 }
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487 #endif // CYGHWR_REDBOOT_LINUX_EXEC_X_SWITCH
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488
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489 // copy the trampline code
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490 memcpy((char *)CYGHWR_REDBOOT_ARM_TRAMPOLINE_ADDRESS,
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491 __tramp_start__,
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492 __tramp_end__ - __tramp_start__);
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493
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494 asm volatile (
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495 CYGARC_HAL_MMU_OFF(%5)
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496 "__tramp_start__:\n"
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497 " cmp %1,%4;\n" // Default kernel load address. Relocate
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498 " beq 2f;\n" // kernel image there if necessary, and
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499 " cmp %2,#0;\n" // if size is non-zero
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500 " beq 2f;\n"
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501 "1:\n"
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502 " ldr r0,[%1],#4;\n"
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503 " str r0,[%4],#4;\n"
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504 " subs %2,%2,#4;\n"
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505 " bne 1b;\n"
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506 "2:\n"
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507 " mov r0,#0;\n" // Set board type
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508 " mov r1,%3;\n" // Machine type
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509 " mov r2,%6;\n" // Kernel parameters
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510 " mov pc,%0;\n" // Jump to kernel
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511 "__tramp_end__:\n"
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512 : :
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513 "r"(entry),
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514 "r"(CYGARC_PHYSICAL_ADDRESS(base_addr)),
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515 "r"(length),
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516 "r"(CYGHWR_REDBOOT_ARM_MACHINE_TYPE),
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517 "r"(CYGHWR_REDBOOT_ARM_LINUX_EXEC_ADDRESS),
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518 "r"(CYGARC_PHYSICAL_ADDRESS(CYGHWR_REDBOOT_ARM_TRAMPOLINE_ADDRESS)),
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519 "r"(CYGARC_PHYSICAL_ADDRESS(CYGHWR_REDBOOT_ARM_LINUX_TAGS_ADDRESS))
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520 : "r0", "r1"
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521 );
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522 }
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523
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524 #endif // HAL_PLATFORM_MACHINE_TYPE - otherwise we do not support this stuff...
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525
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526 // EOF redboot_linux_exec.c