/*
*
* This file contains the entry point for the application.
* The name of this entry point is compiler dependent.
* It jumps to the BSP which is responsible for performing
* all initialization.
*
* COPYRIGHT (c) 1989-1997.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* Based on the `gen68302' board support package, and covered by the
* original distribution terms.
*
* W. Eric Norum
* Saskatchewan Accelerator Laboratory
* University of Saskatchewan
* Saskatoon, Saskatchewan, CANADA
* eric@skatter.usask.ca
*
* $Id$
*/
#include "asm.h"
BEGIN_CODE
/*
* Step 1: Decide on Reset Stack Pointer and Initial Program Counter
*/
Entry:
.long SYM(m360)+1024 | 0: Initial SSP
.long start | 1: Initial PC
.long uhoh | 2: Bus error
.long uhoh | 3: Address error
.long uhoh | 4: Illegal instruction
.long uhoh | 5: Zero division
.long uhoh | 6: CHK, CHK2 instruction
.long uhoh | 7: TRAPcc, TRAPV instructions
.long uhoh | 8: Privilege violation
.long uhoh | 9: Trace
.long uhoh | 10: Line 1010 emulator
.long uhoh | 11: Line 1111 emulator
.long uhoh | 12: Hardware breakpoint
.long uhoh | 13: Reserved for coprocessor violation
.long uhoh | 14: Format error
.long uhoh | 15: Uninitialized interrupt
.long uhoh | 16: Unassigned, reserved
.long uhoh | 17:
.long uhoh | 18:
.long uhoh | 19:
.long uhoh | 20:
.long uhoh | 21:
.long uhoh | 22:
.long uhoh | 23:
.long spurious_interrupt | 24: Spurious interrupt
.long uhoh | 25: Level 1 interrupt autovector
.long uhoh | 26: Level 2 interrupt autovector
.long uhoh | 27: Level 3 interrupt autovector
.long uhoh | 28: Level 4 interrupt autovector
.long uhoh | 29: Level 5 interrupt autovector
.long uhoh | 30: Level 6 interrupt autovector
.long uhoh | 31: Level 7 interrupt autovector
.long uhoh | 32: Trap instruction (0-15)
.long uhoh | 33:
.long uhoh | 34:
.long uhoh | 35:
.long uhoh | 36:
.long uhoh | 37:
.long uhoh | 38:
.long uhoh | 39:
.long uhoh | 40:
.long uhoh | 41:
.long uhoh | 42:
.long uhoh | 43:
.long uhoh | 44:
.long uhoh | 45:
.long uhoh | 46:
.long uhoh | 47:
.long uhoh | 48: Reserved for coprocessor
.long uhoh | 49:
.long uhoh | 50:
.long uhoh | 51:
.long uhoh | 52:
.long uhoh | 53:
.long uhoh | 54:
.long uhoh | 55:
.long uhoh | 56:
.long uhoh | 57:
.long uhoh | 58:
.long uhoh | 59: Unassigned, reserved
.long uhoh | 60:
.long uhoh | 61:
.long uhoh | 62:
.long uhoh | 63:
.long uhoh | 64: User defined vectors (192)
.long uhoh | 65:
.long uhoh | 66:
.long uhoh | 67:
.long uhoh | 68:
.long uhoh | 69:
.long uhoh | 70:
.long uhoh | 71:
.long uhoh | 72:
.long uhoh | 73:
.long uhoh | 74:
.long uhoh | 75:
.long uhoh | 76:
.long uhoh | 77:
.long uhoh | 78:
.long uhoh | 79:
.long uhoh | 80:
.long uhoh | 81:
.long uhoh | 82:
.long uhoh | 83:
.long uhoh | 84:
.long uhoh | 85:
.long uhoh | 86:
.long uhoh | 87:
.long uhoh | 88:
.long uhoh | 89:
.long uhoh | 90:
.long uhoh | 91:
.long uhoh | 92:
.long uhoh | 93:
.long uhoh | 94:
.long uhoh | 95:
.long uhoh | 96:
.long uhoh | 97:
.long uhoh | 98:
.long uhoh | 99:
.long uhoh | 100:
.long uhoh | 101:
.long uhoh | 102:
.long uhoh | 103:
.long uhoh | 104:
.long uhoh | 105:
.long uhoh | 106:
.long uhoh | 107:
.long uhoh | 108:
.long uhoh | 109:
.long uhoh | 110:
.long uhoh | 111:
.long uhoh | 112:
.long uhoh | 113:
.long uhoh | 114:
.long uhoh | 115:
.long uhoh | 116:
.long uhoh | 117:
.long uhoh | 118:
.long uhoh | 119:
.long uhoh | 120:
.long uhoh | 121:
.long uhoh | 122:
.long uhoh | 123:
.long uhoh | 124:
.long uhoh | 125:
.long uhoh | 126:
.long uhoh | 127:
.long uhoh | 128:
.long uhoh | 129:
.long uhoh | 130:
.long uhoh | 131:
.long uhoh | 132:
.long uhoh | 133:
.long uhoh | 134:
.long uhoh | 135:
.long uhoh | 136:
.long uhoh | 137:
.long uhoh | 138:
.long uhoh | 139:
.long uhoh | 140:
.long uhoh | 141:
.long uhoh | 142:
.long uhoh | 143:
.long uhoh | 144:
.long uhoh | 145:
.long uhoh | 146:
.long uhoh | 147:
.long uhoh | 148:
.long uhoh | 149:
.long uhoh | 150:
.long uhoh | 151:
.long uhoh | 152:
.long uhoh | 153:
.long uhoh | 154:
.long uhoh | 155:
.long uhoh | 156:
.long uhoh | 157:
.long uhoh | 158:
.long uhoh | 159:
.long uhoh | 160:
.long uhoh | 161:
.long uhoh | 162:
.long uhoh | 163:
.long uhoh | 164:
.long uhoh | 165:
.long uhoh | 166:
.long uhoh | 167:
.long uhoh | 168:
.long uhoh | 169:
.long uhoh | 170:
.long uhoh | 171:
.long uhoh | 172:
.long uhoh | 173:
.long uhoh | 174:
.long uhoh | 175:
.long uhoh | 176:
.long uhoh | 177:
.long uhoh | 178:
.long uhoh | 179:
.long uhoh | 180:
.long uhoh | 181:
.long uhoh | 182:
.long uhoh | 183:
.long uhoh | 184:
.long uhoh | 185:
.long uhoh | 186:
.long uhoh | 187:
.long uhoh | 188:
.long uhoh | 189:
.long uhoh | 190:
.long uhoh | 191:
.long uhoh | 192:
.long uhoh | 193:
.long uhoh | 194:
.long uhoh | 195:
.long uhoh | 196:
.long uhoh | 197:
.long uhoh | 198:
.long uhoh | 199:
.long uhoh | 200:
.long uhoh | 201:
.long uhoh | 202:
.long uhoh | 203:
.long uhoh | 204:
.long uhoh | 205:
.long uhoh | 206:
.long uhoh | 207:
.long uhoh | 208:
.long uhoh | 209:
.long uhoh | 210:
.long uhoh | 211:
.long uhoh | 212:
.long uhoh | 213:
.long uhoh | 214:
.long uhoh | 215:
.long uhoh | 216:
.long uhoh | 217:
.long uhoh | 218:
.long uhoh | 219:
.long uhoh | 220:
.long uhoh | 221:
.long uhoh | 222:
.long uhoh | 223:
.long uhoh | 224:
.long uhoh | 225:
.long uhoh | 226:
.long uhoh | 227:
.long uhoh | 228:
.long uhoh | 229:
.long uhoh | 230:
.long uhoh | 231:
.long uhoh | 232:
.long uhoh | 233:
.long uhoh | 234:
.long uhoh | 235:
.long uhoh | 236:
.long uhoh | 237:
.long uhoh | 238:
.long uhoh | 239:
.long uhoh | 240:
.long uhoh | 241:
.long uhoh | 242:
.long uhoh | 243:
.long uhoh | 244:
.long uhoh | 245:
.long uhoh | 246:
.long uhoh | 247:
.long uhoh | 248:
.long uhoh | 249:
.long uhoh | 250:
.long uhoh | 251:
.long uhoh | 252:
.long uhoh | 253:
.long uhoh | 254:
.long uhoh | 255:
/*
* Default trap handler
* With an oscilloscope you can see AS* stop
*/
uhoh: nop | Leave spot for breakpoint
stop #0x2700 | Stop with interrupts disabled
bra.s uhoh | Stuck forever
/*
* Log, but otherwise ignore, spurious interrupts
*/
spurious_interrupt:
addql #1,SYM(_M68kSpuriousInterruptCount)
rte
/*
* Place the low-order 3 octets of the board's ethernet address at
* a `well-known' fixed location relative to the beginning of ROM.
*/
.align 2
.long ETHERNET_ADDRESS | Low-order 3 octets of ethernet address
/*
* For some reason, the symbol start must not be global.
*
* .global start
*/
/*
* Initial PC
*/
start:
/*
* Step 2: Stay in Supervisor Mode
*/
#if ( M68K_HAS_SEPARATE_STACKS == 1 )
oriw #0x3000,sr | Switch to Master Stack Pointer
lea SYM(m360)+1024-64,a7 | Load stack pointer with space
| for the Interrupt Stack
#endif
/*
* Step 3: Write the VBR
*/
lea Entry,a0 | Get base of vector table
movec a0,vbr | Set up the VBR
/*
* Step 4: Write the MBAR
*/
movec dfc,d1 | Save destination register
moveq #7,d0 | CPU-space funcction code
movec d0,dfc | Set destination function code register
movel #SYM(m360)+0x101,d0 | MBAR value (mask CPU space accesses)
movesl d0,0x3FF00 | Set MBAR
movec d1,dfc | Restore destination register
/*
* Step 5: Verify a dual-port RAM location
*/
lea SYM(m360),a0 | Point a0 to first DPRAM location
moveb #0x33,d0 | Set the test value
moveb d0,a0@ | Set the memory location
cmpb a0@,d0 | Does it read back?
bne uhoh | If not, bad news!
notb d0 | Flip bits
moveb d0,a0@ | Set the memory location
cmpb a0@,d0 | Does it read back?
bne uhoh | If not, bad news!
/*
* Remaining steps are handled by C code
*/
jmp SYM(_Init68360) | Start C code (which never returns)
/*
* Copy DATA segment, clear BSS segment, set up real stack,
* initialize heap, start C program.
* Assume that DATA and BSS sizes are multiples of 4.
*/
PUBLIC (_CopyDataClearBSSAndStart)
SYM(_CopyDataClearBSSAndStart):
lea copy_start,a0 | Get start of DATA in RAM
lea SYM(etext),a2 | Get start of DATA in ROM
cmpl a0,a2 | Are they the same?
beq.s NOCOPY | Yes, no copy necessary
lea copy_end,a1 | Get end of DATA in RAM
bra.s COPYLOOPTEST | Branch into copy loop
COPYLOOP:
movel a2@+,a0@+ | Copy word from ROM to RAM
COPYLOOPTEST:
cmpl a1,a0 | Done?
bcs.s COPYLOOP | No, skip
NOCOPY:
lea clear_start,a0 | Get start of BSS
lea clear_end,a1 | Get end of BSS
clrl d0 | Value to set
bra.s ZEROLOOPTEST | Branch into clear loop
ZEROLOOP:
movel d0,a0@+ | Clear a word
ZEROLOOPTEST:
cmpl a1,a0 | Done?
bcs.s ZEROLOOP | No, skip
movel #stack_init,a7 | set master stack pointer
movel d0,a7@- | environp
movel d0,a7@- | argv
movel d0,a7@- | argc
jsr SYM(main) | Call C main
| Should this just force a reset?
mainDone: nop | Leave spot for breakpoint
movew #1,a7 | Force a double bus error
movel d0,a7@- | This should cause a RESET
stop #0x2700 | Stop with interrupts disabled
bra.s mainDone | Stuck forever
.align 2
PUBLIC (_HeapSize)
SYM (_HeapSize):
.long HeapSize
PUBLIC (_StackSize)
SYM (_StackSize):
.long StackSize
END_CODE
BEGIN_DATA_DCL
.align 2
PUBLIC (environ)
SYM (environ):
.long 0
PUBLIC (_M68kSpuriousInterruptCount)
SYM (_M68kSpuriousInterruptCount):
.long 0
END_DATA_DCL
END
