Mercurial > hg > Members > kono > nitros9-code

annotate level1/modules/boot_common.asm @ 2152:74fb212cb659

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Changelog comes from higher up
author boisy
date Wed, 14 May 2008 02:13:22 +0000
parents 73a8a7fe0151
children e0614e08fa5e
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1 ********************************************************************
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2 * Boot Common - Common code for NitrOS-9 booters
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3 *
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4 * $Id$
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5 *
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6 * This common file is not a stand-alone module, but is 'used' by boot module
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7 * source files to bring in support for booting from RBF file systems that have
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8 * either standard or new-style fragmented bootfiles.
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9 *
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10 * This code uses several static variables which are expected to be defined in
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11 * the main boot source code. See a booter like boot_1773.asm for an example on
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12 * how to write a booter which uses this code.
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13 *
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14 * Important Notes:
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15 * For certain devices, only the lower 16 bits of DD.BT are used. This special
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16 * case allows us to save some code by ignoring the loading LSN bits 23-16 in
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17 * DD.BT and FDSL.A. Booters for such devices (floppy, RAMPak) should have the
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18 * following line in their code to take advantage of this optimization:
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19 *
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20 * LSN24BIT equ 0
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21 *
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22 * Floppy booters require the acquistion of DD.TKS and DD.FMT from LSN0 to make
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23 * certain decisions about the boot process. In most cases, non-floppy booters
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24 * do not need these values. Hence, floppy booters should have this line in their
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25 * source code file:
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26 *
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27 * FLOPPY equ 1
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28 *
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29 * Edt/Rev YYYY/MM/DD Modified by
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30 * Comment
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31 * ------------------------------------------------------------------
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32 * 2005/10/14 Boisy G. Pitre
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33 * Created as a stand-alone file.
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34 *
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35 * 2005/10/16 Boisy G. Pitre
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36 * Further optimizations made
1964
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37 *
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38 * 2006/01/04 P.Harvey-Smith.
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39 * Added pointer to loaded LSN0 to data passed to hardware dependent section.
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40 *
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41 * 2007/08/23 Boisy G. Pitre
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42 * Added 'subd #$00FF' to counteract earlier 'addd #$00FF'. We need to undo
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43 * to give F$SRqMem the right amount of memory to allocate.
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44 *
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45 * 2007/08/24 Boisy G. Pitre
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46 * We no longer use F$SRqMem to get the 256 byte buffer for LSN0, but
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47 * instead allocate the memory temporarily off the stack. This gives us
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48 * two system ram pages that were not available before, and also prevents
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49 * a needless system call.
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50 * Note: For Level 1, we actually use the page above the stack at $500-$5FF
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51 * to hold LSN0 during the bootfile acquisition process. This is because the
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52 * system stack is only 256 bytes and we are using more than that. Since
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53 * the module directory table is at $400-$4FF, we must do this; otherwise, we
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54 * would overwrite the bottom portion of the module directory table and corrupt
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55 * it (it's already setup by krn before boot is called!)
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56
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57 start orcc #IntMasks ensure IRQs are off (necessary?)
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58 * allocate memory on stack for vars and sector buffer
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59 IFEQ Level-1
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60 * Level 1: stack is only 256 bytes and its bottom runs against moddir ptrs... so cheat and use free page just above stack
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61 * for 256 byte disk buffer
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62 leas -size,s
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63 tfr s,u get pointer to data area
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64 ldx #$500
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65 ELSE
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66 leas -size-256,s
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67 tfr s,u get pointer to data area
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68 leax size,u point U to 256 byte sector buffer
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69 ENDC
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70 pshs u save pointer to data area
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71 stx blockloc,u
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72
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73 * Initialize Hardware
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74 ldy Address,pcr get hardware address
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75 lbsr HWInit
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76
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77 * Read LSN0
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78 IFNE LSN24BIT
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79 clrb MSB sector
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80 ENDC
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81 ldx #0 LSW sector
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82 lbsr HWRead read LSN 0
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83 bcs error branch if error
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84
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85 IFGT Level-1
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86 lda #'0 --- loaded in LSN0'
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87 jsr <D.BtBug ---
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88 ENDC
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89
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90 stx LSN0Ptr,u Save LSN0 pointer
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91 * Pull relevant values from LSN0
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92 IFNE FLOPPY
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93 lda DD.TKS,x number of tracks on this disk
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94 ldb DD.FMT,x disk format byte
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95 std ddtks,u TAKE NOTE! ASSUMES ADJACENT VARS!
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96 ENDC
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97 ldd DD.BSZ,x os9boot size in bytes
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98 beq FragBoot if zero, do frag boot
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99 std bootsize,u
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100 * Old style boot -- make a fake FD segment right from LSN0!
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101 leax DD.BT,x
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102 addd #$00FF round up to next page
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103 * Important note: We are making an assumption that the upper 8 bits of the
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104 * FDSL.B field will always be zero. That is a safe assumption, since an
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105 * FDSL.B value of $00FF would mean the file is 65280 bytes. A bootfile
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106 * under NitrOS-9 cannot be this large, and therefore this assumption
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107 * is safe.
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108 sta FDSL.B+1,x save file size
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109 IFNE LSN24BIT
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110 clr FDSL.S,x make next segment entry 0
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111 ENDC
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112 clr FDSL.S+1,x
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113 clr FDSL.S+2,x
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114 subd #$00FF undo previous add #$00FF
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115 bra GrabBootMem
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116
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117 Back2Krn lbsr HWTerm call HW termination routine
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118 ldx blockimg,u pointer to start of os9boot in memory
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119 clrb clear carry
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120 ldd bootsize,u
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121 error
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122 IFEQ Level-1
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123 leas 2+size,s reset the stack same as PULS U
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124 ELSE
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125 leas 2+size+256,s reset the stack same as PULS U
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126 ENDC
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127 rts return to kernel
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128
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129
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130 * NEW! Fragmented boot support!
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131 *FragBoot ldb bootloc,u MSB fd sector location
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132 * ldx bootloc+1,u LSW fd sector location
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133 FragBoot ldb DD.BT,x MSB fd sector location
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134 ldx DD.BT+1,x LSW fd sector location
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135 lbsr HWRead get fd sector
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136 ldd FD.SIZ+2,x get file size (we skip first two bytes)
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137 std bootsize,u
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138 leax FD.SEG,x point to segment table
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139
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140 GrabBootMem
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141 IFGT Level-1
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142 os9 F$BtMem
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143 ELSE
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144 os9 F$SRqMem
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145 ENDC
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146 bcs error
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147 * Save off alloced mem from F$SRqMem into blockloc,u and restore
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148 * the statics pointer in U
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149 tfr u,d save pointer to requested memory
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150 ldu ,s recover pointer to data stack
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151 std blockloc,u
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152 std blockimg,u
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153
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154 * Get os9boot into memory
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155 BootLoop stx seglist,u update segment list
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156 IFNE LSN24BIT
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157 ldb FDSL.A,x MSB sector location
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158 ENDC
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159 BL2 ldx FDSL.A+1,x LSW sector location
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160 IFNE LSN24BIT
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161 bne BL3
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162 tstb
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163 ENDC
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164 beq Back2Krn
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165 BL3 lbsr HWRead
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166 inc blockloc,u point to next input sector in mem
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167
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168 IFGT Level-1
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169 lda #'. show .'
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170 jsr <D.BtBug
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171 ENDC
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172
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173 ldx seglist,u get pointer to segment list
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174 dec FDSL.B+1,x get segment size
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175 beq NextSeg if <=0, get next segment
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176
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177 ldd FDSL.A+1,x update sector location by one
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178 addd #1
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179 std FDSL.A+1,x
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180 IFNE LSN24BIT
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181 ldb FDSL.A,x
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182 adcb #0
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183 stb FDSL.A,x
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184 ENDC
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185 bra BL2
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186
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187 NextSeg leax FDSL.S,x advance to next segment entry
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188 bra BootLoop