Mercurial > hg > Members > kono > nitros9-code
annotate level1/modules/boot_sdc.asm @ 3130:e0614e08fa5e
l1 boot modules: Expand documentation and clean up code
Tidy up white-space and indentation.
Expand documentation to show C flag is important on return
from HWRead.
Expand documentation to show how/why/when filler is needed at
end of file.
Delete dead code in some places. No functional changes.
| author | Neal Crook <foofoobedoo@gmail.com> |
|---|---|
| date | Sun, 04 Dec 2016 21:01:42 +0000 |
| parents | 47cd23dcf55e |
| children |
| rev | line source |
|---|---|
| 3033 | 1 ******************************************************************** |
| 2 * Boot - CoCo SDC Boot module | |
|
3130
e0614e08fa5e
l1 boot modules: Expand documentation and clean up code
Neal Crook <foofoobedoo@gmail.com>
parents:
3117
diff
changeset
|
3 * Provides HWInit, HWTerm, HWRead which are called by code in |
|
e0614e08fa5e
l1 boot modules: Expand documentation and clean up code
Neal Crook <foofoobedoo@gmail.com>
parents:
3117
diff
changeset
|
4 * "use"d boot_common.asm |
| 3033 | 5 * |
| 6 * $Id$ | |
| 7 * | |
| 8 * Edt/Rev YYYY/MM/DD Modified by | |
| 9 * Comment | |
| 10 * ------------------------------------------------------------------ | |
| 11 * 2014/12/22 Darren Atkinson | |
| 12 * Created. | |
| 13 | |
| 14 nam Boot | |
| 15 ttl SDC Boot module | |
| 16 | |
| 17 IFP1 | |
| 18 use defsfile | |
| 19 ENDC | |
| 20 | |
| 21 * Default Boot is from drive 0 | |
| 22 BootDr set 0 | |
| 23 | |
| 24 * Alternate Boot is from drive 1 | |
| 25 IFEQ DNum-1 | |
| 26 BootDr set 1 | |
| 27 ENDC | |
| 28 | |
| 29 * Common booter-required defines | |
| 30 LSN24BIT equ 1 | |
| 31 FLOPPY equ 0 | |
| 32 | |
| 33 * DPort offsets | |
| 34 CONTROL equ 0 write-only | |
| 35 CMDREG equ 8+0 write-only | |
| 36 STATREG equ CMDREG read-only | |
| 37 LSNREG equ 8+1 | |
| 38 DATAREG equ 8+2 | |
| 39 | |
| 40 * NOTE: these are U-stack offsets, not DP | |
| 41 seglist rmb 2 pointer to segment list | |
| 42 blockloc rmb 2 pointer to memory requested | |
| 43 blockimg rmb 2 duplicate of the above | |
| 44 bootsize rmb 2 size in bytes | |
| 45 LSN0Ptr rmb 2 In memory LSN0 pointer | |
| 46 size equ . | |
| 47 | |
| 48 | |
| 49 tylg set Systm+Objct | |
| 50 atrv set ReEnt+rev | |
| 51 rev set $00 | |
| 52 edition set 1 | |
| 53 | |
| 54 mod eom,name,tylg,atrv,start,size | |
| 55 | |
| 56 name fcs /Boot/ | |
| 57 fcb edition | |
| 58 | |
| 59 | |
| 60 *-------------------------------------------------------------------------- | |
| 61 * HWInit - Initialize the device | |
| 62 * | |
| 63 * Entry: | |
| 64 * Y = hardware address | |
| 65 * | |
| 66 * Exit: | |
| 67 * Carry Clear = OK, Set = Error | |
| 68 * B = error (Carry Set) | |
| 69 * | |
|
3117
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
70 HWInit |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
71 IFNE mc09 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
72 clrb |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
73 rts |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
74 ELSE |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
75 orcc #$50 mask interrupts |
| 3033 | 76 lda #$D0 stop any emulated FDC command |
| 77 sta CMDREG,y | |
| 78 pshs d,x,y,u delay | |
| 79 puls d,x,y,u | |
| 80 lda STATREG,y clear INTRQ | |
| 81 | |
| 82 *** Fall Thru *** | |
|
3117
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
83 ENDC |
| 3033 | 84 *-------------------------------------------------------------------------- |
| 85 * HWTerm - Terminate the device | |
| 86 * | |
| 87 * Entry: | |
| 88 * Y = hardware address | |
| 89 * | |
| 90 * Exit: | |
| 91 * Carry Clear = OK, Set = Error | |
| 92 * B = error (Carry Set) | |
| 93 * | |
| 94 HWTerm clrb no error | |
|
3117
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
95 IFNE mc09 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
96 ELSE |
| 3033 | 97 stb CONTROL,y disable command mode |
|
3117
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
98 ENDC |
| 3033 | 99 rts |
| 100 | |
| 101 | |
| 102 *************************************************************************** | |
| 103 use boot_common.asm | |
| 104 *************************************************************************** | |
| 105 | |
| 106 * | |
| 107 * HWRead - Read a 256 byte sector from the device | |
| 108 * | |
| 109 * Entry: | |
| 110 * Y = hardware address | |
| 111 * B = bits 23-16 of LSN | |
| 112 * X = bits 15-0 of LSN | |
| 113 * blockloc,u = where to load the 256 byte sector | |
| 114 * | |
| 115 * Exit: | |
| 116 * X = ptr to data (i.e. ptr in blockloc,u) | |
|
3130
e0614e08fa5e
l1 boot modules: Expand documentation and clean up code
Neal Crook <foofoobedoo@gmail.com>
parents:
3117
diff
changeset
|
117 * Carry Clear = OK, Set = Error |
| 3033 | 118 * |
|
3117
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
119 * multicomp09: |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
120 * for now, the image starts at SDcard block $02.8000 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
121 * so simply need to add that offset to the incoming |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
122 * LSN and load it into the hardware. Simples! |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
123 HWRead |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
124 IFNE mc09 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
125 bsr LDSDADRS set up address |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
126 * WAIT FOR PREVIOUS COMMAND (IF ANY) TO COMPLETE |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
127 RDBIZ LDA SDCTL |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
128 CMPA #$80 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
129 BNE RDBIZ |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
130 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
131 * ISSUE THE READ COMMAND TO THE SDCARD CONTROLLER |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
132 CLRA |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
133 STA SDCTL |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
134 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
135 * TRANSFER 512 BYTES, WAITING FOR EACH IN TURN. ONLY WANT 256 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
136 * OF THEM - DISCARD THE REST |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
137 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
138 ldx blockloc,u get address of buffer to fill |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
139 pshs x |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
140 CLRB ZERO IS LIKE 256 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
141 SDRBIZ LDA SDCTL |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
142 CMPA #$E0 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
143 BNE SDRBIZ BYTE NOT READY |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
144 LDA SDDATA GET BYTE |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
145 STA ,X+ STORE IN SECTOR BUFFER |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
146 DECB |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
147 BNE SDRBIZ NEXT |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
148 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
149 SDRBIZ2 LDA SDCTL B IS ALREADY ZERO (LIKE 256) |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
150 CMPA #$E0 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
151 BNE SDRBIZ2 BYTE NOT READY |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
152 LDA SDDATA GET BYTE (BUT DO NOTHING WITH IT) |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
153 DECB |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
154 BNE SDRBIZ2 NEXT |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
155 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
156 puls x |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
157 clra carry clear -> successful completion |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
158 RTS |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
159 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
160 ELSE |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
161 lda #$43 start command mode |
| 3033 | 162 sta CONTROL,y |
| 163 stb LSNREG,y put LSN into registers | |
| 164 stx LSNREG+1,y | |
| 165 clra A=0 for use at rdExit | |
| 166 bsr waitSDC wait for BUSY to be cleared | |
| 167 bcs rdExit exit on error or timeout | |
| 168 ldb WhichDrv,pcr get drive number | |
| 169 andb #1 limit to 0 or 1 | |
| 170 orb #$80 combine with Read Sector command | |
| 171 stb CMDREG,y send command to controller | |
| 172 bsr waitSDC wait for data READY | |
| 173 bcs rdExit exit on error or timeout | |
| 174 ldx blockloc,u get address of buffer to fill | |
| 175 pshs u,x preserve U and X | |
| 176 ldb #256/2 1/2 sector size | |
| 177 rdLoop ldu DATAREG,y read word data from controller | |
| 178 stu ,x++ store to buffer | |
| 179 decb decrement word counter | |
| 180 bne rdLoop loop until done | |
| 181 puls x,u restore X and U | |
| 182 rdExit sta CONTROL,y end command mode | |
| 183 rts | |
|
3117
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
184 ENDC |
| 3033 | 185 |
|
3117
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
186 IFNE mc09 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
187 ******************************************************************* |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
188 * SET SDLBA2 SDLBA1 SDLBA0 FOR NEXT SD OPERATION |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
189 * add $02.8000 to {B,XH,XL} and load into the hardware |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
190 * registers. |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
191 * Can destroy A, B, X, CC |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
192 * Assumption: the lowest byte of the adder ($02.8000 here) will |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
193 * always be 0 and so never need fixup |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
194 LDSDADRS pshs b |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
195 tfr x,d |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
196 stb SDLBA0 ls byte is done. |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
197 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
198 ldb #$02 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
199 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
200 adda #$80 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
201 sta SDLBA1 middle byte is done |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
202 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
203 adcb #$00 add carry from middle byte |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
204 addb ,s+ add and drop stacked b |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
205 stb SDLBA2 |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
206 rts |
|
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
207 ELSE |
| 3033 | 208 |
| 209 *-------------------------------------------------------------------------- | |
| 210 * Wait for controller status to indicate either "Not Busy" or "Ready". | |
| 211 * Will time out if neither condition satisfied within a suitable period. | |
| 212 * | |
| 213 * Exit: | |
| 214 * CC.C set on error or time out | |
| 215 * | |
| 216 waitSDC ldx #0 setup timeout counter | |
| 217 waitLp bsr waitRet extra cycles for timeout | |
| 218 comb set carry for timeout/FAILED | |
| 219 leax ,-x decrement timeout counter | |
| 220 beq waitRet return if timed out | |
| 221 ldb STATREG,y read status | |
| 222 bmi waitRet return if FAILED | |
| 223 lsrb BUSY --> Carry | |
| 224 bcc waitRet return if not busy | |
| 225 rolb clear carry | |
| 226 bitb #2 test READY | |
| 227 beq waitLp loop if not ready for transfer | |
| 228 waitRet rts return | |
|
3117
47cd23dcf55e
Incorporate mc09 in build, add support in l1 init/rel/boot_sdc
Neal Crook <foofoobedoo@gmail.com>
parents:
3033
diff
changeset
|
229 ENDC |
| 3033 | 230 |
| 231 | |
| 232 *-------------------------------------------------------------------------- | |
| 233 | |
| 234 IFGT Level-1 | |
|
3130
e0614e08fa5e
l1 boot modules: Expand documentation and clean up code
Neal Crook <foofoobedoo@gmail.com>
parents:
3117
diff
changeset
|
235 * L2 kernel file is composed of rel, boot, krn. The size of each of these |
|
e0614e08fa5e
l1 boot modules: Expand documentation and clean up code
Neal Crook <foofoobedoo@gmail.com>
parents:
3117
diff
changeset
|
236 * is controlled with filler, so that (after relocation): |
|
e0614e08fa5e
l1 boot modules: Expand documentation and clean up code
Neal Crook <foofoobedoo@gmail.com>
parents:
3117
diff
changeset
|
237 * rel starts at $ED00 and is $130 bytes in size |
|
e0614e08fa5e
l1 boot modules: Expand documentation and clean up code
Neal Crook <foofoobedoo@gmail.com>
parents:
3117
diff
changeset
|
238 * boot starts at $EE30 and is $1D0 bytes in size |
|
e0614e08fa5e
l1 boot modules: Expand documentation and clean up code
Neal Crook <foofoobedoo@gmail.com>
parents:
3117
diff
changeset
|
239 * krn starts at $F000 and ends at $FEFF (there is no 'emod' at the end |
|
e0614e08fa5e
l1 boot modules: Expand documentation and clean up code
Neal Crook <foofoobedoo@gmail.com>
parents:
3117
diff
changeset
|
240 * of krn and so there are no module-end boilerplate bytes) |
|
e0614e08fa5e
l1 boot modules: Expand documentation and clean up code
Neal Crook <foofoobedoo@gmail.com>
parents:
3117
diff
changeset
|
241 * |
|
e0614e08fa5e
l1 boot modules: Expand documentation and clean up code
Neal Crook <foofoobedoo@gmail.com>
parents:
3117
diff
changeset
|
242 * Filler to get to a total size of $1D0. 3, 2, 1 represent bytes after |
|
e0614e08fa5e
l1 boot modules: Expand documentation and clean up code
Neal Crook <foofoobedoo@gmail.com>
parents:
3117
diff
changeset
|
243 * the filler: the end boilerplate for the module, fdb and fcb respectively. |
| 3033 | 244 Filler fill $39,$1D0-3-2-1-* |
| 245 ENDC | |
| 246 | |
| 247 Address fdb DPort | |
| 248 WhichDrv fcb BootDr | |
| 249 | |
| 250 emod | |
| 251 eom equ * | |
| 252 end |