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annotate packages/hal/powerpc/mbx/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
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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-ppc/mbx.h in
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43 // the Linux kernel, Copyright (c) 1997 Dan Malek. 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): msalter
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53 // Contributors: gthomas,msalter
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54 // Date: 2002-01-14
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55 // Purpose:
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56 // Description:
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57 //
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58 // This code is part of RedBoot (tm).
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59 //
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60 //####DESCRIPTIONEND####
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61 //
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62 //==========================================================================
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63
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64 #include <redboot.h>
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65 #include CYGBLD_HAL_TARGET_H
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66 #include CYGBLD_HAL_PLATFORM_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
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71 #ifdef CYGSEM_REDBOOT_HAL_LINUX_BOOT
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72
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73 #include CYGHWR_MEMORY_LAYOUT_H
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74
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75 //=========================================================================
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76
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77 // Exported CLI function(s)
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78 static void do_exec(int argc, char *argv[]);
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79 RedBoot_cmd("exec",
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80 "Execute an image - with MMU off",
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81 "[-w timeout]\n"
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82 " [-r <ramdisk addr> [-s <ramdisk length>]]\n"
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83 " [-c \"kernel command line\"] [<entry_point>]",
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84 do_exec
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85 );
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86
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87 //=========================================================================
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88 // Imported from Linux kernel include/asm-ppc/mbx.h
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89 // Copyright (c) 1997 Dan Malek (dmalek@jlc.net)
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90 // Used with permission of author.
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91
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92
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93 /* A Board Information structure that is given to a program when
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94 * EPPC-Bug starts it up.
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95 */
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96 typedef struct bd_info {
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97 unsigned int bi_tag; /* Should be 0x42444944 "BDID" */
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98 unsigned int bi_size; /* Size of this structure */
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99 unsigned int bi_revision; /* revision of this structure */
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100 unsigned int bi_bdate; /* EPPCbug date, i.e. 0x11061997 */
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101 unsigned int bi_memstart; /* Memory start address */
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102 unsigned int bi_memsize; /* Memory (end) size in bytes */
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103 unsigned int bi_intfreq; /* Internal Freq, in Hz */
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104 unsigned int bi_busfreq; /* Bus Freq, in Hz */
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105 unsigned int bi_clun; /* Boot device controller */
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106 unsigned int bi_dlun; /* Boot device logical dev */
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107
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108 /* These fields are not part of the board information structure
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109 * provided by the boot rom. They are filled in by embed_config.c
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110 * so we have the information consistent with other platforms.
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111 */
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112 unsigned char bi_enetaddr[6];
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113 unsigned int bi_baudrate;
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114 } bd_t;
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115
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116 /* Memory map for the MBX as configured by EPPC-Bug. We could reprogram
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117 * The SIU and PCI bridge, and try to use larger MMU pages, but the
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118 * performance gain is not measureable and it certainly complicates the
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119 * generic MMU model.
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120 *
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121 * In a effort to minimize memory usage for embedded applications, any
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122 * PCI driver or ISA driver must request or map the region required by
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123 * the device. For convenience (and since we can map up to 4 Mbytes with
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124 * a single page table page), the MMU initialization will map the
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125 * NVRAM, Status/Control registers, CPM Dual Port RAM, and the PCI
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126 * Bridge CSRs 1:1 into the kernel address space.
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127 */
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128 #define PCI_ISA_IO_ADDR ((unsigned)0x80000000)
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129 #define PCI_ISA_IO_SIZE ((unsigned int)(512 * 1024 * 1024))
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130 #define PCI_IDE_ADDR ((unsigned)0x81000000)
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131 #define PCI_ISA_MEM_ADDR ((unsigned)0xc0000000)
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132 #define PCI_ISA_MEM_SIZE ((unsigned int)(512 * 1024 * 1024))
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133 #define PCMCIA_MEM_ADDR ((unsigned int)0xe0000000)
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134 #define PCMCIA_MEM_SIZE ((unsigned int)(64 * 1024 * 1024))
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135 #define PCMCIA_DMA_ADDR ((unsigned int)0xe4000000)
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136 #define PCMCIA_DMA_SIZE ((unsigned int)(64 * 1024 * 1024))
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137 #define PCMCIA_ATTRB_ADDR ((unsigned int)0xe8000000)
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138 #define PCMCIA_ATTRB_SIZE ((unsigned int)(64 * 1024 * 1024))
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139 #define PCMCIA_IO_ADDR ((unsigned int)0xec000000)
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140 #define PCMCIA_IO_SIZE ((unsigned int)(64 * 1024 * 1024))
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141 #define NVRAM_ADDR ((unsigned int)0xfa000000)
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142 #define NVRAM_SIZE ((unsigned int)(1 * 1024 * 1024))
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143 #define MBX_CSR_ADDR ((unsigned int)0xfa100000)
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144 #define MBX_CSR_SIZE ((unsigned int)(1 * 1024 * 1024))
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145 #define IMAP_ADDR ((unsigned int)0xfa200000)
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146 #define IMAP_SIZE ((unsigned int)(64 * 1024))
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147 #define PCI_CSR_ADDR ((unsigned int)0xfa210000)
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148 #define PCI_CSR_SIZE ((unsigned int)(64 * 1024))
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149
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150 /* Map additional physical space into well known virtual addresses. Due
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151 * to virtual address mapping, these physical addresses are not accessible
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152 * in a 1:1 virtual to physical mapping.
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153 */
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154 #define ISA_IO_VIRT_ADDR ((unsigned int)0xfa220000)
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155 #define ISA_IO_VIRT_SIZE ((unsigned int)64 * 1024)
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156
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157 /* Interrupt assignments.
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158 * These are defined (and fixed) by the MBX hardware implementation.
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159 */
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160 #define POWER_FAIL_INT SIU_IRQ0 /* Power fail */
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161 #define TEMP_HILO_INT SIU_IRQ1 /* Temperature sensor */
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162 #define QSPAN_INT SIU_IRQ2 /* PCI Bridge (DMA CTLR?) */
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163 #define ISA_BRIDGE_INT SIU_IRQ3 /* All those PC things */
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164 #define COMM_L_INT SIU_IRQ6 /* MBX Comm expansion connector pin */
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165 #define STOP_ABRT_INT SIU_IRQ7 /* Stop/Abort header pin */
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166
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167 /* The MBX uses the 8259.
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168 */
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169 #define NR_8259_INTS 16
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170
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171 // End of imported data/structures
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172 //=========================================================================
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173
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174 #define MBX_CSR_COM1 0x02 // COM1 enabled
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175
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176 //
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177 // Execute a Linux kernel - this is a RedBoot CLI command
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178 //
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179 static void
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180 do_exec(int argc, char *argv[])
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181 {
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182 unsigned long entry;
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183 bool wait_time_set;
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184 int wait_time;
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185 bool cmd_line_set, ramdisk_addr_set, ramdisk_size_set;
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186 unsigned long ramdisk_addr, ramdisk_size;
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187 char *cmd_line;
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188 char *cline;
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189 struct option_info opts[6];
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190
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191 bd_t *board_info;
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192
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193 CYG_INTERRUPT_STATE oldints;
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194 unsigned long sp = CYGMEM_REGION_ram+CYGMEM_REGION_ram_SIZE;
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195
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196 init_opts(&opts[0], 'w', true, OPTION_ARG_TYPE_NUM,
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197 (void **)&wait_time, (bool *)&wait_time_set, "wait timeout");
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198 init_opts(&opts[1], 'c', true, OPTION_ARG_TYPE_STR,
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199 (void **)&cmd_line, (bool *)&cmd_line_set, "kernel command line");
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200 init_opts(&opts[2], 'r', true, OPTION_ARG_TYPE_NUM,
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201 (void **)&ramdisk_addr, (bool *)&ramdisk_addr_set, "ramdisk_addr");
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202 init_opts(&opts[3], 's', true, OPTION_ARG_TYPE_NUM,
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203 (void **)&ramdisk_size, (bool *)&ramdisk_size_set, "ramdisk_size");
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204 if (!scan_opts(argc, argv, 1, opts, 4, (void *)&entry, OPTION_ARG_TYPE_NUM,
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205 "[physical] starting address"))
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206 {
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207 return;
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208 }
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209
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210 // Make a little space at the top of the stack, and align to
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211 // 64-bit boundary.
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212 sp = (sp-8) & ~7;
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213
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214 // Set up parameter struct at top of stack
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215
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216 sp = sp-sizeof(bd_t);
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217
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218 board_info = (bd_t *)sp;
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219
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220 board_info->bi_tag = 0x42444944;
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221 board_info->bi_size = sizeof(board_info);
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222 board_info->bi_revision = 1;
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223 board_info->bi_bdate = 0x11061997;
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224 board_info->bi_memstart = CYGMEM_REGION_ram;
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225 board_info->bi_memsize = CYGMEM_REGION_ram_SIZE;
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226 board_info->bi_intfreq = CYGHWR_HAL_POWERPC_BOARD_SPEED;
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227 board_info->bi_busfreq = 66; // ????
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228 board_info->bi_clun = 0; // ????
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229 board_info->bi_dlun = 0; // ????
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230
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231 // Copy the commandline onto the stack, and set the SP to just below it.
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232
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233 // If no cmd_line set in args, set it to empty string.
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234 if( !cmd_line_set )
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235 cmd_line = "";
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236
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237 {
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238 int len,i;
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239
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240 // get length of string
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241 for( len = 0; cmd_line[len] != '\0'; len++ );
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242
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243 // decrement sp by length of string and align to
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244 // word boundary.
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245 sp = (sp-(len+1)) & ~3;
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246
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247 // assign this SP value to command line start
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248 cline = (char *)sp;
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249
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250 // copy command line over.
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251 for( i = 0; i < len; i++ )
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252 cline[i] = cmd_line[i];
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253 cline[len] = '\0';
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254
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255 // adjust SP to 64 bit boundary, and leave a little space
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256 // between it and the commandline for PowerPC calling
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257 // conventions.
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258
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259 sp = (sp-32)&~7;
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260
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261 }
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262
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263 // Disable interrupts
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264 HAL_DISABLE_INTERRUPTS(oldints);
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265
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266 // Put the caches to sleep.
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267 HAL_DCACHE_SYNC();
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268 HAL_ICACHE_DISABLE();
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269 HAL_DCACHE_DISABLE();
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270 HAL_DCACHE_SYNC();
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271 HAL_ICACHE_INVALIDATE_ALL();
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272 HAL_DCACHE_INVALIDATE_ALL();
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273
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274 // diag_printf("entry %08x sp %08x bi %08x cl %08x\n",
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275 // entry,sp,board_info,cline);
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276 // breakpoint();
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277
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278 // Call into Linux
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279 *(volatile unsigned char *)MBX_CSR_ADDR |= MBX_CSR_COM1; // Magic that says COM1 enabled
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280 __asm__ volatile (
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281 // Linux seems to want the I/O mapped at 0xFA200000
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282 "lis 3,0xFA20\n"
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283 "mtspr 638,3\n"
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284
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285 // Start by disabling MMU - the mappings are
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286 // 1-1 so this should not cause any problems
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287 "mfmsr 3\n"
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288 "li 4,0xFFFFFFCF\n"
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289 "and 3,3,4\n"
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290 "sync\n"
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291 "mtmsr 3\n"
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292 "sync\n"
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293
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294 // Now set up parameters to jump into linux
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295
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296 "mtlr %0\n" // set entry address in LR
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297 "mr 1,%1\n" // set stack pointer
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298 "mr 3,%2\n" // set board info in R3
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299 "mr 4,%3\n" // set command line in R4
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300 "blr \n" // jump into linux
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301 :
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302 : "r"(entry),"r"(sp),"r"(board_info),"r"(cline)
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303 : "r3", "r4"
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304
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305 );
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306 }
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307
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308 #endif // CYGSEM_REDBOOT_HAL_LINUX_BOOT
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309
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310 //=========================================================================
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311 // EOF redboot_linux_exec.c