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annotate level2/modules/ramd_coco3fpga.asm @ 3150:37737e5ec640

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Add coco3fpga RAM disk and RTC driver Added clock2_coco3fpga.as to level1/modules. Added ramd_coco3fpga.asm & r0_ramd_coco3fpga.asm to level2/modules. Build them on level2/coco3. Added definitions to "coco3/modules/makefile" to build 'ramd_coco3fpga.dr", "r0_ramd_cocofga.dd" & "clock2_coco3fpga".
author Bill Pierce <merlinious999@gmail.com>
date Mon, 06 Feb 2017 22:25:15 +0100
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3150
37737e5ec640 Add coco3fpga RAM disk and RTC driver
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1 ********************************************************************
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2 * RAMD SDRAM Disk Driver for CoCo3FPGA
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3 *
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4 * $Id: ramd.asm,v 1.0 2016/12/09 14:52:42 gbecker Exp $
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5 *
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6 * Ed. Comments Who YY/MM/DD
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7 * ------------------------------------------------------------------
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8 * 1 Initial driver Gary Becker 16/12/09
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9 *
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10 * 2 Updated to conform to NitrOS9 Repo Bill Pierce 17/02/04
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11 *
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12
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13 * $FF84: SDRAM Control Register (Write)
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14 RAMDCON equ $00
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15 * Bit Signal
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16 * 0 R/W
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17 *
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18 * $FF84: Disk Flag (Read)
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19 RAMDSTA equ $00
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20 * Bit Signal
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21 * 7 Operation Finished
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22 * 0 R/W
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23 * $FF85-$FF86: DATA (Read / Write)
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24 RAMDDAT equ $01
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25 *
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26 * $FF87-88: Block Address
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27 RAMDADD equ $03
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28 *
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29 N.Drives equ 1 number of drives to support
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30 *
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31 * Command equates
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32 *
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33 *
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34 nam RAMD
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35 ttl os9 device driver
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36
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37 use os9.d
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38 use rbf.d
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39 use coco.d
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40
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41 tylg set Drivr+Objct
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42 atrv set ReEnt+rev
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43 rev set $01
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44
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45 org 0
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46 mod eom,name,tylg,atrv,start,size
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47 fcb $ff
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48
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49 u0000 rmb DRVBEG+(DRVMEM*N.Drives)
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50
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51 size equ .
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52
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53 fcb $FF This byte is the driver permissions
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54 name fcs /RAMD/
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55 fcb 1 edition #1
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56
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57 start bra INIT 3 bytes per entry to keep RBF happy
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58 nop
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59 bra READ
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60 nop
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61 bra WRITE
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62 nop
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63 bra GETSTA
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64 nop
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65 bra SETSTA
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66 nop
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67 bra TERM
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68 nop
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69
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70 * Read
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71 *
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72 * Entry:
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73 * B = MSB of LSN
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74 * X = LSB of LSN
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75 * Y = address of path descriptor
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76 * U = address of device memory area
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77 *
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78 * Exit:
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79 * CC = carry set on error
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80 * B = error code
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81 *
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82 READ lda #$01 1=READ the sector
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83 tstb Make sure 3rd byte of LSN is 0
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84 bne ERROR
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85 pshs x,y Save these registers for later
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86 tst ,s Check high bit of X (Low 16 bits of LSN)
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87 bmi ERROR2 Should equal 0
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88 bsr GetSect Go read the sector
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89 puls x,y
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90 tfr x,d
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91 tstb Test one byte of saved X
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92 bne TERM
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93 tsta Test other byte of saved X
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94 bne TERM
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95 * LSN0, standard OS-9 format
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96 ldy PD.BUF,y address of buffer
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97 leau DRVBEG,u point to the beginning of the drive tables
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98 ldb #DD.SIZ copy bytes over
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99 copy.0 lda ,y+ grab from LSN0
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100 sta ,u+ save into device static storage
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101 decb Finished when B=0
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102 bne copy.0
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103 bra TERM Return
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104
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105 *
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106 * Entry:
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107 * B = MSB of LSN
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108 * X = LSB of LSN
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109 * Y = address of path descriptor
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110 * U = address of device memory area
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111 *
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112 * Exit:
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113 * CC = carry set on error
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114 * B = error code
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115 *
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116 GetSect
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117 * orcc #IntMasks Kill interrupts
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118 pshs x save 2 byte LSN
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119 ldx V.PORT,u get address of hardware
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120 sta RAMDCON,x Setup for a READ
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121 puls d Get 2 byte LSN
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122 std RAMDADD,x Put it in the address
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123 ldy PD.BUF,y address of buffer
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124 lda #$80 128 2 byte transfers
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125 pshs a On stack
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126 lda RAMDDAT+1,x Start transfer
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127 LP0 tst RAMDSTA,x Is transfer completed?
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128 bpl LP0
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129 ldd RAMDDAT,x Yes, read 2 bytes from RAM
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130 std ,y++ Store them in buffer
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131 dec ,s Are we finished?
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132 bne LP0 No
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133 puls b clear b
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134 * andcc #^(IntMasks) Renable Interrupts
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135 rts
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136
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137 ERROR2 puls x,y
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138 ERROR ldb E$SeekRg Only error is Seek out of Range
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139 comb Set carry bit
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140 rts
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141
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142 * Init
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143 *
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144 * Entry:
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145 * Y = address of device descriptor
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146 * U = address of device memory area
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147 *
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148 * Exit:
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149 * CC = carry set on error
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150 * B = error code
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151 *
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152 INIT
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153 leax DRVBEG,u point to the beginning of the drive tables
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154 ldd #$8000 Number of total sectors
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155 stb DD.TOT,x $00
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Bill Pierce <merlinious999@gmail.com>
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156 std DD.TOT+1,x $8000
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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157 ldd #$0100 A=$01 B=$00
37737e5ec640 Add coco3fpga RAM disk and RTC driver
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158 stb V.NDRV,u $01
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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159 * lda #$FF Probably not needed
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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160 * sta V.TRAK,u
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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161
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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162 TERM
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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163 * no SetSta calls - return, no error, ignore
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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164 SETSTA
37737e5ec640 Add coco3fpga RAM disk and RTC driver
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165 * no GetSta calls - return, no error, ignore
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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166 GETSTA
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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167 andcc #^Carry clear carry
37737e5ec640 Add coco3fpga RAM disk and RTC driver
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168 rts
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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169
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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170 *
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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171 * Entry:
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
parents:
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172 * B = MSB of LSN
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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173 * X = LSB of LSN
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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174 * Y = address of path descriptor
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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175 * U = address of device memory area
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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176 *
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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177 * Exit:
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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178 * CC = carry set on error
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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179 * B = error code
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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180 *
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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181 WRITE clra 0 =WRITE to disk
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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182 tstb Make sure 3rd byte of LSN is 0
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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183 bne ERROR
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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184 pshs x,y Save these registers for later
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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185 tst ,s Check high bit of X (Low 16 bits of LSN)
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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186 bmi ERROR2 Should equal 0
37737e5ec640 Add coco3fpga RAM disk and RTC driver
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187 * Get Sector comes here with:
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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188 * Entry: A = read/write command code (0/1)
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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189 * B = MSB of the disk's LSN
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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190 * X = LSW of the disk's LSN
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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191 * Y = path dsc. ptr
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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192 * U = Device static storage ptr
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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193 * Exit: CC = carry set on error
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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194 * A = error status from command register
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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195 PutSect
37737e5ec640 Add coco3fpga RAM disk and RTC driver
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196 * orcc #IntMasks Kill interrupts
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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197 ldx V.PORT,u get address of hardware
37737e5ec640 Add coco3fpga RAM disk and RTC driver
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198 sta RAMDCON,x Setup for a READ
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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199 ldy PD.BUF,y address of buffer
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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200 puls d Get 2 byte LSN
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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201 std RAMDADD,x Put it in the address
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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202 lda #$80 128 2 byte transfers
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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203 pshs a On stack
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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204 LP2 ldd ,y++ get 2 bytes
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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205 std RAMDDAT,x write them to th RAM
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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206 LP1 tst RAMDSTA,x is the transfer completed?
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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207 bpl LP1
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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208 dec ,s
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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209 bne LP2
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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210 puls b clear b
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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211 puls y
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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212 * andcc #^(IntMasks) Renable Interrupts
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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213 bra TERM
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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214
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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215 emod
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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216
37737e5ec640 Add coco3fpga RAM disk and RTC driver
Bill Pierce <merlinious999@gmail.com>
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217 eom equ *