URL
https://opencores.org/ocsvn/openrisc/openrisc/trunk
Subversion Repositories openrisc
[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [m68k/] [gen68340/] [start/] [startfor340only.S] - Rev 690
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/** 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) 1989-1999.* On-Line Applications Research Corporation (OAR).** The license and distribution terms for this file may in* the file LICENSE in this distribution or at* http://www.OARcorp.com/rtems/license.html.** Based on the `gen68360' board support package, and covered by the* original distribution terms.** Geoffroy Montel* France Telecom - CNET/DSM/TAM/CAT* 4, rue du Clos Courtel* 35512 CESSON-SEVIGNE* FRANCE** e-mail: g_montel@yahoo.com** $Id: startfor340only.S,v 1.2 2001-09-27 12:00:07 chris Exp $*/#include "asm.h"#include <m68340.inc>BEGIN_CODE/** Step 1: Decide on Reset Stack Pointer and Initial Program Counter*/Entry:.long SYM(m340)+1024 | 0: Initial SSP.long start | 1: Initial PC.long SYM(_uhoh) | 2: Bus error.long SYM(_uhoh) | 3: Address error.long SYM(_uhoh) | 4: Illegal instruction.long SYM(_uhoh) | 5: Zero division.long SYM(_uhoh) | 6: CHK, CHK2 instruction.long SYM(_uhoh) | 7: TRAPcc, TRAPV instructions.long SYM(_uhoh) | 8: Privilege violation.long SYM(_uhoh) | 9: Trace.long SYM(_uhoh) | 10: Line 1010 emulator.long SYM(_uhoh) | 11: Line 1111 emulator.long SYM(_uhoh) | 12: Hardware breakpoint.long SYM(_uhoh) | 13: Reserved for coprocessor violation.long SYM(_uhoh) | 14: Format error.long SYM(_uhoh) | 15: Uninitialized interrupt.long SYM(_uhoh) | 16: Unassigned, reserved.long SYM(_uhoh) | 17:.long SYM(_uhoh) | 18:.long SYM(_uhoh) | 19:.long SYM(_uhoh) | 20:.long SYM(_uhoh) | 21:.long SYM(_uhoh) | 22:.long SYM(_uhoh) | 23:.long SYM(_spuriousInterrupt) | 24: Spurious interrupt.long SYM(_uhoh) | 25: Level 1 interrupt autovector.long SYM(_uhoh) | 26: Level 2 interrupt autovector.long SYM(_uhoh) | 27: Level 3 interrupt autovector.long SYM(_uhoh) | 28: Level 4 interrupt autovector.long SYM(_uhoh) | 29: Level 5 interrupt autovector.long SYM(_uhoh) | 30: Level 6 interrupt autovector.long SYM(_uhoh) | 31: Level 7 interrupt autovector.long SYM(_uhoh) | 32: Trap instruction (0-15).long SYM(_uhoh) | 33:.long SYM(_uhoh) | 34:.long SYM(_uhoh) | 35:.long SYM(_uhoh) | 36:.long SYM(_uhoh) | 37:.long SYM(_uhoh) | 38:.long SYM(_uhoh) | 39:.long SYM(_uhoh) | 40:.long SYM(_uhoh) | 41:.long SYM(_uhoh) | 42:.long SYM(_uhoh) | 43:.long SYM(_uhoh) | 44:.long SYM(_uhoh) | 45:.long SYM(_uhoh) | 46:.long SYM(_uhoh) | 47:.long SYM(_uhoh) | 48: Reserved for coprocessor.long SYM(_uhoh) | 49:.long SYM(_uhoh) | 50:.long SYM(_uhoh) | 51:.long SYM(_uhoh) | 52:.long SYM(_uhoh) | 53:.long SYM(_uhoh) | 54:.long SYM(_uhoh) | 55:.long SYM(_uhoh) | 56:.long SYM(_uhoh) | 57:.long SYM(_uhoh) | 58:.long SYM(_uhoh) | 59: Unassigned, reserved.long SYM(_uhoh) | 60:.long SYM(_uhoh) | 61:.long SYM(_uhoh) | 62:.long SYM(_uhoh) | 63:.long SYM(_uhoh) | 64: User defined vectors (192).long SYM(_uhoh) | 65:.long SYM(_uhoh) | 66:.long SYM(_uhoh) | 67:.long SYM(_uhoh) | 68:.long SYM(_uhoh) | 69:.long SYM(_uhoh) | 70:.long SYM(_uhoh) | 71:.long SYM(_uhoh) | 72:.long SYM(_uhoh) | 73:.long SYM(_uhoh) | 74:.long SYM(_uhoh) | 75:.long SYM(_uhoh) | 76:.long SYM(_uhoh) | 77:.long SYM(_uhoh) | 78:.long SYM(_uhoh) | 79:.long SYM(_uhoh) | 80:.long SYM(_uhoh) | 81:.long SYM(_uhoh) | 82:.long SYM(_uhoh) | 83:.long SYM(_uhoh) | 84:.long SYM(_uhoh) | 85:.long SYM(_uhoh) | 86:.long SYM(_uhoh) | 87:.long SYM(_uhoh) | 88:.long SYM(_uhoh) | 89:.long SYM(_uhoh) | 90:.long SYM(_uhoh) | 91:.long SYM(_uhoh) | 92:.long SYM(_uhoh) | 93:.long SYM(_uhoh) | 94:.long SYM(_uhoh) | 95:.long SYM(_uhoh) | 96:.long SYM(_uhoh) | 97:.long SYM(_uhoh) | 98:.long SYM(_uhoh) | 99:.long SYM(_uhoh) | 100:.long SYM(_uhoh) | 101:.long SYM(_uhoh) | 102:.long SYM(_uhoh) | 103:.long SYM(_uhoh) | 104:.long SYM(_uhoh) | 105:.long SYM(_uhoh) | 106:.long SYM(_uhoh) | 107:.long SYM(_uhoh) | 108:.long SYM(_uhoh) | 109:.long SYM(_uhoh) | 110:.long SYM(_uhoh) | 111:.long SYM(_uhoh) | 112:.long SYM(_uhoh) | 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SYM(_uhoh) | 157:.long SYM(_uhoh) | 158:.long SYM(_uhoh) | 159:.long SYM(_uhoh) | 160:.long SYM(_uhoh) | 161:.long SYM(_uhoh) | 162:.long SYM(_uhoh) | 163:.long SYM(_uhoh) | 164:.long SYM(_uhoh) | 165:.long SYM(_uhoh) | 166:.long SYM(_uhoh) | 167:.long SYM(_uhoh) | 168:.long SYM(_uhoh) | 169:.long SYM(_uhoh) | 170:.long SYM(_uhoh) | 171:.long SYM(_uhoh) | 172:.long SYM(_uhoh) | 173:.long SYM(_uhoh) | 174:.long SYM(_uhoh) | 175:.long SYM(_uhoh) | 176:.long SYM(_uhoh) | 177:.long SYM(_uhoh) | 178:.long SYM(_uhoh) | 179:.long SYM(_uhoh) | 180:.long SYM(_uhoh) | 181:.long SYM(_uhoh) | 182:.long SYM(_uhoh) | 183:.long SYM(_uhoh) | 184:.long SYM(_uhoh) | 185:.long SYM(_uhoh) | 186:.long SYM(_uhoh) | 187:.long SYM(_uhoh) | 188:.long SYM(_uhoh) | 189:.long SYM(_uhoh) | 190:.long SYM(_uhoh) | 191:.long SYM(_uhoh) | 192:.long SYM(_uhoh) | 193:.long SYM(_uhoh) | 194:.long SYM(_uhoh) | 195:.long SYM(_uhoh) | 196:.long SYM(_uhoh) | 197:.long SYM(_uhoh) | 198:.long SYM(_uhoh) | 199:.long SYM(_uhoh) | 200:.long SYM(_uhoh) | 201:.long SYM(_uhoh) | 202:.long SYM(_uhoh) | 203:.long SYM(_uhoh) | 204:.long SYM(_uhoh) | 205:.long SYM(_uhoh) | 206:.long SYM(_uhoh) | 207:.long SYM(_uhoh) | 208:.long SYM(_uhoh) | 209:.long SYM(_uhoh) | 210:.long SYM(_uhoh) | 211:.long SYM(_uhoh) | 212:.long SYM(_uhoh) | 213:.long SYM(_uhoh) | 214:.long SYM(_uhoh) | 215:.long SYM(_uhoh) | 216:.long SYM(_uhoh) | 217:.long SYM(_uhoh) | 218:.long SYM(_uhoh) | 219:.long SYM(_uhoh) | 220:.long SYM(_uhoh) | 221:.long SYM(_uhoh) | 222:.long SYM(_uhoh) | 223:.long SYM(_uhoh) | 224:.long SYM(_uhoh) | 225:.long SYM(_uhoh) | 226:.long SYM(_uhoh) | 227:.long SYM(_uhoh) | 228:.long SYM(_uhoh) | 229:.long SYM(_uhoh) | 230:.long SYM(_uhoh) | 231:.long SYM(_uhoh) | 232:.long SYM(_uhoh) | 233:.long SYM(_uhoh) | 234:.long SYM(_uhoh) | 235:.long SYM(_uhoh) | 236:.long SYM(_uhoh) | 237:.long SYM(_uhoh) | 238:.long SYM(_uhoh) | 239:.long SYM(_uhoh) | 240:.long SYM(_uhoh) | 241:.long SYM(_uhoh) | 242:.long SYM(_uhoh) | 243:.long SYM(_uhoh) | 244:.long SYM(_uhoh) | 245:.long SYM(_uhoh) | 246:.long SYM(_uhoh) | 247:.long SYM(_uhoh) | 248:.long SYM(_uhoh) | 249:.long SYM(_uhoh) | 250:.long SYM(_uhoh) | 251:.long SYM(_uhoh) | 252:.long SYM(_uhoh) | 253:.long SYM(_uhoh) | 254:.long SYM(_uhoh) | 255:/** Default trap handler* With an oscilloscope you can see AS* stop*/PUBLIC (_uhoh)SYM(_uhoh): nop | Leave spot for breakpointstop #0x2700 | Stop with interrupts disabledbra.s SYM(_uhoh) | Stuck forever/** Log, but otherwise ignore, spurious interrupts*/PUBLIC (_spuriousInterrupt)SYM(_spuriousInterrupt):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 startup location.*/.align 2.word 0 | Paddingethernet_address_buffer:.word 0x08F3 | Default address.word 0xDEAD.word 0xCAFE/* -- equates -- */.equ _PROM_Start, 0x01000000 /* CS0 */.equ _BCCram_Start, 0x00000000 /* CS1 */.equ _FLEX_Start, 0x08000000 /* CS2 */.equ _I2C_Start, 0x02000000 /* CS3 */.equ _EXTram_Start, 0x10000000 /* CS4 */.equ _EXTram_Size, 0x000400000 /* 4 Mbytes */.equ _SPEED, 0xD780 /* 25 Mhz CPU349 *//* .equ _SPEED, 0xD700 25 Mhz *//* .equ _SPEED, 0xCE00 16 Mhz */BEGIN_DATA_crt0_init_stack:ds.l 0x1000_crt0_init_stktop:BEGIN_CODEdc.l _crt0_init_stktop /* reset SP */dc.l _crt0_cold_start /* reset PC */dc.l _crt0_warm_start.ascii "RTEMS"dc.w 0.align 2_table_cs:/* carte Astecc - 68340 */dc.l 0x003FFFF0 /* Mask CS0 (4Mbytes PROM, 32bits, 0WS) *//* dc.l 0x003FFFFD Mask CS0 (4Mbytes PROM, 16bits, 3WS) */dc.l ((_PROM_Start&0xFFFFFF00)+0x00000003) /* Base CS0 *//* dc.l 0x0000FFF1 MASK CS1 (RAMBCC340, 0WS, FTE) */dc.l 0x0000FFFD /* MASK CS1 (RAMBCC340, 0WS, FTE) *//* dc.l ((_BCCram_Start&0xFFFFFF00)+0x00000007) Base CS1 */dc.l ((_BCCram_Start&0xFFFFFF00)+0x00000003) /* Base CS1 */dc.l 0x000000FF /* MASK CS2 (FLEX, ext DTACK, 256 bytes) */dc.l ((_FLEX_Start&0xFFFFFF00)+0x00000003) /* Base CS2 */dc.l 0x000000FF /* Mask CS3 (I2C, ext DTACK, 256 bytes) */dc.l ((_I2C_Start&0xFFFFFF00)+0x00000003) /* Base CS3 *//** Initial PC*/.globl startstart:_crt0_cold_start:moveq.l #0,d0 /* signal cold reset */bra.s _crt0_common_start_crt0_warm_start:moveq.l #1,d0 /* signal warm reset */_crt0_common_start:move.w #0x2700,sr /* disable interrupts and switch to interrupt mode */movea.l #_crt0_init_stktop,sp /* set up initialization stack */lea Entry,a0 /* Get base of vector table */movec a0,vbr /* Set up the VBR */moveq.l #0x07,d1movec.l d1,dfc /* prepare access in CPU space */move.l #(BASE_SIM+1),d1moves.l d1,BASE_REG /* base initialization (must be MOVES, PCC-130795) */moveq.l #0x05,d1movec.l d1,dfcmovea.l #BASE_SIM,a0/* -- disable Bus Monitor -- */move.b #0,SIM_SYPCR(a0) /* system protection control register *//* -- set frequency to 25.16 Mhz -- */move.w #_SPEED,SIM_SYNCR(a0) /* clock */sync_wait:btst.b #3,(SIM_SYNCR+1)(a0)beq sync_wait/* -- enable A31-A24 -- */clr.b SIM_PPRA1(a0)/* -- show cycles, user acces to SIM, 4 /CS & 4 /IT -- */move.w #0x427F,SIM_MCR(a0)/* -- chip select initialization -- */lea.l SIM_MASKH0(a0),a2lea.l _table_cs(%pc),a1moveq.l #0x07,d1_b_cs:move.l (a1)+, (a2)+dbra d1,_b_cs/* fill RAM if COLDSTART */tst.l d0bne _dont_fillmovea.l #_EXTram_Start,a0 /* get start */move.l #_EXTram_Size,d1 /* get size */lsr.l #2,d1 /* ajust for long word */_fill_loop:clr.l (a0)+subq.l #1,d1bne _fill_loop_dont_fill:jmp SYM(_Init68340) | 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 RAMlea SYM(etext),a2 | Get start of DATA in ROMcmpl a0,a2 | Are they the same?beq.s NOCOPY | Yes, no copy necessarylea copy_end,a1 | Get end of DATA in RAMbra.s COPYLOOPTEST | Branch into copy loopCOPYLOOP:movel a2@+,a0@+ | Copy word from ROM to RAMCOPYLOOPTEST:cmpl a1,a0 | Done?bcs.s COPYLOOP | No, skipNOCOPY:lea clear_start,a0 | Get start of BSSlea clear_end,a1 | Get end of BSSclrl d0 | Value to setbra.s ZEROLOOPTEST | Branch into clear loopZEROLOOP:movel d0,a0@+ | Clear a wordZEROLOOPTEST:cmpl a1,a0 | Done?bcs.s ZEROLOOP | No, skipmovel #stack_init,a7 | set master stack pointermovel d0,a7@- | environpmovel d0,a7@- | argvmovel d0,a7@- | argcjsr SYM(boot_card) | Call C mainPUBLIC (_mainDone)SYM(_mainDone):nop | Leave spot for breakpointmovew #1,a7 | Force a double bus errormovel d0,a7@- | This should cause a RESETstop #0x2700 | Stop with interrupts disabledbra.s SYM(_mainDone) | Stuck forever.align 2BEGIN_DATA_DCL.align 2PUBLIC (environ)SYM (environ):.long 0PUBLIC (_M68kSpuriousInterruptCount)SYM (_M68kSpuriousInterruptCount):.long 0END_DATA_DCLEND
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