114 lines
3.0 KiB
ArmAsm
114 lines
3.0 KiB
ArmAsm
.data
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.asciz "@(#)srt0.s 1.1 92/07/30 SMI";
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.even
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#include "assym.s"
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| This variable is used in the DELAY macro. 5 is the right value for
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| 68010's running 10MHz. 3 is the right value for 68020's running 16MHz
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| with cache on. (4x as fast at doing the delay loop.) Other values
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| should be empirically determined as needed.
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| It's critical that the value be no SMALLER than required, e.g. the
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| DELAY macro guarantees a MINIMUM delay, not a maximum.
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.globl _cpudelay
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_cpudelay:
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.long 3 | Multiplier for DELAY macro.
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.text
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| Copyright (c) 1988 by Sun Microsystems, Inc.
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| Startup code for standalone system
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.globl _end
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.globl _edata
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.globl _main
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.globl __exit
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.globl __exitto
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HIGH = 0x2700
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.globl _start
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_start:
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#ifdef BOOTBLOCK
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| The following globals are filled in by installboot (qv)
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| after bootxx is built. They contain the block numbers
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| where /boot may be found.
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| This data table must be above _start, since only what is
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| above _start is copied to high memory. That means we
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| have to jump over the data, hence _start1.
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.globl start1, _bootb, _bbsize, _bbchecksum
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jmp start1
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_bootb:
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| should be NBLKENTRIES (64), see installboot.c
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.long 0,0,0,0,0,0,0,0 | room for boot_tab
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.long 0,0,0,0,0,0,0,0
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.long 0,0,0,0,0,0,0,0
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.long 0,0,0,0,0,0,0,0
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.long 0,0,0,0,0,0,0,0
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.long 0,0,0,0,0,0,0,0
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.long 0,0,0,0,0,0,0,0
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.long 0,0,0,0,0,0,0,0
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_bbsize: .long 0
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_bbchecksum: .long 0
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start1:
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#endif /* BOOTBLOCK */
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movw #HIGH,sr | just in case
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leax: lea pc@(_start-(leax+2)),a0 | True current location of "_start"
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lea _start:l,a1 | Desired location of "_start"
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movl a0,d3 | save source address (njl)
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movl a1,d4 | save destination address (njl)
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cmpl a0,a1
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jeq gobegin | If the same, just go do it.
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movl #_end,d0 | Desired end of program
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subl a1,d0 | Calculate length, round up.
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lsrl #2,d0
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movl d0,d5 | save length in words (njl)
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movc: movl a0@+,a1@+ | Move it where it belongs.
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dbra d0,movc
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| Turn on the cache...
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moveq #CACR_CLEAR+CACR_ENABLE,d0
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movc d0,cacr
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jmp begin:l | Force non-PCrel jump
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begin:
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| We create a stack below the booter for use by the thing we are loading
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movl sp,LOAD-4:l
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movl #LOAD-4,sp
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movl #_edata,a0
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clr:
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clrl a0@+
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cmpl #_end,a0
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ble clr
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#ifdef sun2
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jsr _setkcontext
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#endif
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| reset translation table to prevent YYY
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movl V_TRANSLATION,a0
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movl a0@, d0
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movl #1, a0@
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clrl sp@- | argv = 0 for now.
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clrl sp@- | argc = 0 for now.
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jsr _main
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addqw #8,sp
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jsr _exit | after main() returns, call exit().
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| Just fall thru into __exit if exit() ever returns.
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__exit:
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movl LOAD-4:l,sp | Restore caller's stack pointer
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rts | Return to caller (PROM probably)
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| Transfer control to a new program, passing on the same arguments that
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| we (srt0.s) received when we were started. Note that this does NOT call
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| exit() -- you'd better close your files yourself.
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__exitto:
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movl sp@(4),a0 | Address to call
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movl LOAD-4:l,sp | Restore caller's stack pointer
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jra a0@ | Jump to callee using caller's stk
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