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freebsd-dev/sys/boot/alpha/libalpha/start.S

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This is the new unified bootstrap, sometimes known previously as the '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.
1998-08-21 03:17:42 +00:00
/*
Bring the 'new-bus' to the i386. This extensively changes the way the i386 platform boots, it is no longer ISA-centric, and is fully dynamic. Most old drivers compile and run without modification via 'compatability shims' to enable a smoother transition. eisa, isapnp and pccard* are not yet using the new resource manager. Once fully converted, all drivers will be loadable, including PCI and ISA. (Some other changes appear to have snuck in, including a port of Soren's ATA driver to the Alpha. Soren, back this out if you need to.) This is a checkpoint of work-in-progress, but is quite functional. The bulk of the work was done over the last few years by Doug Rabson and Garrett Wollman. Approved by: core
1999-04-16 21:22:55 +00:00
* $Id: start.S,v 1.2 1998/10/31 17:12:32 dfr Exp $
This is the new unified bootstrap, sometimes known previously as the '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.
1998-08-21 03:17:42 +00:00
* From: $NetBSD: start.S,v 1.4 1998/03/28 00:54:15 cgd Exp $
*/
/*
* Mach Operating System
* Copyright (c) 1992 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
#include <machine/asm.h>
/*
* start --
* Entry point for boot/standalone programs.
*
* Arguments:
* a0 long (first free physical page)
*
* This is where the prom comes to. Leaves all exception and interrupts
* to prom, runs off prom's stack too. No return values.
*/
.text
.set noreorder /* don't reorder instructions */
#define ENTRY_FRAME 32
Bring the 'new-bus' to the i386. This extensively changes the way the i386 platform boots, it is no longer ISA-centric, and is fully dynamic. Most old drivers compile and run without modification via 'compatability shims' to enable a smoother transition. eisa, isapnp and pccard* are not yet using the new resource manager. Once fully converted, all drivers will be loadable, including PCI and ISA. (Some other changes appear to have snuck in, including a port of Soren's ATA driver to the Alpha. Soren, back this out if you need to.) This is a checkpoint of work-in-progress, but is quite functional. The bulk of the work was done over the last few years by Doug Rabson and Garrett Wollman. Approved by: core
1999-04-16 21:22:55 +00:00
#define STACK_SIZE 8192
This is the new unified bootstrap, sometimes known previously as the '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.
1998-08-21 03:17:42 +00:00
NESTED(start, 1, ENTRY_FRAME, ra, 0, 0)
br pv,Lstartgp
Lstartgp:
LDGP(pv)
lda a0,_edata
lda a1,_end
subq a1,a0,a1
CALL(bzero)
* Extend the memory available for the heap from 256k to 512k. * Embed the stack into the bss section for loader and netboot. This is required for netboot since otherwise the stack would be inside our heap. * Install loader and netboot in /boot by default. * Fix getbootfile so that it searches for a ',' instead of a ';' when terminating the filename.
1998-10-31 17:12:32 +00:00
#if defined(NETBOOT) || defined(LOADER)
Bring the 'new-bus' to the i386. This extensively changes the way the i386 platform boots, it is no longer ISA-centric, and is fully dynamic. Most old drivers compile and run without modification via 'compatability shims' to enable a smoother transition. eisa, isapnp and pccard* are not yet using the new resource manager. Once fully converted, all drivers will be loadable, including PCI and ISA. (Some other changes appear to have snuck in, including a port of Soren's ATA driver to the Alpha. Soren, back this out if you need to.) This is a checkpoint of work-in-progress, but is quite functional. The bulk of the work was done over the last few years by Doug Rabson and Garrett Wollman. Approved by: core
1999-04-16 21:22:55 +00:00
lda sp,stack + STACK_SIZE - ENTRY_FRAME
* Extend the memory available for the heap from 256k to 512k. * Embed the stack into the bss section for loader and netboot. This is required for netboot since otherwise the stack would be inside our heap. * Install loader and netboot in /boot by default. * Fix getbootfile so that it searches for a ',' instead of a ';' when terminating the filename.
1998-10-31 17:12:32 +00:00
#endif
This is the new unified bootstrap, sometimes known previously as the '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.
1998-08-21 03:17:42 +00:00
CALL(main) /* transfer to C */
XLEAF(_rtt, 0)
XLEAF(halt, 0)
call_pal PAL_halt /* halt if we ever return */
END(start)
/*
* Dummy routine for GCC2.
*/
LEAF(__main,0)
RET
END(__main)
/*
* cpu_number
* Return the cpu number, using the whami instruction.
*/
LEAF(cpu_number, 0)
call_pal PAL_VMS_mfpr_whami
RET
END(cpu_number)
* Extend the memory available for the heap from 256k to 512k. * Embed the stack into the bss section for loader and netboot. This is required for netboot since otherwise the stack would be inside our heap. * Install loader and netboot in /boot by default. * Fix getbootfile so that it searches for a ',' instead of a ';' when terminating the filename.
1998-10-31 17:12:32 +00:00
#if defined(NETBOOT) || defined(LOADER)
Bring the 'new-bus' to the i386. This extensively changes the way the i386 platform boots, it is no longer ISA-centric, and is fully dynamic. Most old drivers compile and run without modification via 'compatability shims' to enable a smoother transition. eisa, isapnp and pccard* are not yet using the new resource manager. Once fully converted, all drivers will be loadable, including PCI and ISA. (Some other changes appear to have snuck in, including a port of Soren's ATA driver to the Alpha. Soren, back this out if you need to.) This is a checkpoint of work-in-progress, but is quite functional. The bulk of the work was done over the last few years by Doug Rabson and Garrett Wollman. Approved by: core
1999-04-16 21:22:55 +00:00
BSS(stack, STACK_SIZE)
* Extend the memory available for the heap from 256k to 512k. * Embed the stack into the bss section for loader and netboot. This is required for netboot since otherwise the stack would be inside our heap. * Install loader and netboot in /boot by default. * Fix getbootfile so that it searches for a ',' instead of a ';' when terminating the filename.
1998-10-31 17:12:32 +00:00
#endif
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