c2f9d95de5
'three-stage' bootstrap. There are a number of caveats with the code in its current state: - The i386 bootstrap only supports booting from a floppy. - The kernel and kld do not yet know how to deal with the extended information and module summary passed in. - PnP-based autodetection and demand loading of modules is not implemented. - i386 ELF kernel loading is not ready yet. - The i386 bootstrap is loaded via an ugly blockmap. On the alpha, both net- and disk-booting (SRM console machines only) is supported. No blockmaps are used by this code. Obtained from: Parts from the NetBSD/i386 standalone bootstrap.
86 lines
2.0 KiB
ArmAsm
86 lines
2.0 KiB
ArmAsm
/*
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* $Id$
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* From: $NetBSD: start.S,v 1.4 1998/03/28 00:54:15 cgd Exp $
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*/
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/*
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* Mach Operating System
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* Copyright (c) 1992 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*/
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#include <machine/asm.h>
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/*
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* start --
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* Entry point for boot/standalone programs.
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*
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* Arguments:
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* a0 long (first free physical page)
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*
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* This is where the prom comes to. Leaves all exception and interrupts
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* to prom, runs off prom's stack too. No return values.
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*/
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.text
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.set noreorder /* don't reorder instructions */
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#define ENTRY_FRAME 32
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NESTED(start, 1, ENTRY_FRAME, ra, 0, 0)
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br pv,Lstartgp
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Lstartgp:
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LDGP(pv)
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#ifndef PRIMARY_BOOTBLOCK
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lda sp,start /* start stack below text */
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lda sp,-ENTRY_FRAME(sp)
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#endif
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lda a0,_edata
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lda a1,_end
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subq a1,a0,a1
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CALL(bzero)
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CALL(main) /* transfer to C */
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XLEAF(_rtt, 0)
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XLEAF(halt, 0)
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call_pal PAL_halt /* halt if we ever return */
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END(start)
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/*
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* Dummy routine for GCC2.
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*/
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LEAF(__main,0)
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RET
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END(__main)
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/*
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* cpu_number
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* Return the cpu number, using the whami instruction.
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*/
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LEAF(cpu_number, 0)
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call_pal PAL_VMS_mfpr_whami
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RET
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END(cpu_number)
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