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Copy data passed by the boot loader into an array "bootinfo". 

The former "cyloffset" argument is used as an (indirect) pointer to the
information structures. "cyloffset" has always been set to zero in the
past, so this should be save to do.
This commit is contained in:
drochner 1997-09-20 14:01:26 +00:00
parent 968f26b9d3
commit 610abce93b
1 changed files with 36 additions and 6 deletions
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42
sys/arch/i386/i386/locore.s
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@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.168 1997/09/09 21:42:38 mycroft Exp $ */
/* $NetBSD: locore.s,v 1.169 1997/09/20 14:01:26 drochner Exp $ */
/*-
* Copyright (c) 1993, 1994, 1995 Charles M. Hannum. All rights reserved.
@ -61,6 +61,7 @@
#include <machine/segments.h>
#include <machine/specialreg.h>
#include <machine/trap.h>
#include <machine/bootinfo.h>
/*
* override user-land alignment before including asm.h
@ -149,8 +150,9 @@
.data
.globl _cpu,_cpu_id,_cpu_vendor,_cpuid_level,_cpu_feature
.globl _cold,_esym,_boothowto,_bootdev,_atdevbase
.globl _cyloffset,_proc0paddr,_curpcb,_PTDpaddr,_biosbasemem
.globl _cold,_esym,_boothowto,_bootinfo,_atdevbase
.globl _bootdev
.globl _proc0paddr,_curpcb,_PTDpaddr,_biosbasemem
.globl _biosextmem,_dynamic_gdt
_cpu: .long 0 # are we 386, 386sx, or 486, or Pentium, or..
_cpu_id: .long 0 # saved from `cpuid' instruction
@ -160,7 +162,6 @@ _cpu_vendor: .space 16 # vendor string returned by `cpuid' instruction
_cold: .long 1 # cold till we are not
_esym: .long 0 # ptr to end of syms
_atdevbase: .long 0 # location of start of iomem in virtual
_cyloffset: .long 0
_proc0paddr: .long 0
_PTDpaddr: .long 0 # paddr of PTD, for libkvm
#ifndef BIOSBASEMEM
@ -188,7 +189,7 @@ tmpstk:
start: movw $0x1234,0x472 # warm boot
/*
* Load parameters from stack (howto, bootdev, unit, cyloffset, esym).
* Load parameters from stack (howto, bootdev, unit, bootinfo, esym).
* note: (%esp) is return address of boot
* (If we want to hold onto /boot, it's physical %esp up to _end.)
*/
@ -197,7 +198,36 @@ start: movw $0x1234,0x472 # warm boot
movl 8(%esp),%eax
movl %eax,RELOC(_bootdev)
movl 12(%esp),%eax
movl %eax,RELOC(_cyloffset)
testl %eax, %eax
jz 1f
movl (%eax), %ebx /* number of entries */
movl $RELOC(_bootinfo), %edx
movl %ebx, (%edx)
addl $4, %edx
2:
testl %ebx, %ebx
jz 1f
addl $4, %eax
movl (%eax), %ecx /* address of entry */
pushl %eax
pushl (%ecx) /* len */
pushl %edx
addl (%ecx), %edx /* update dest pointer */
cmpl $RELOC(_bootinfo + BOOTINFO_MAXSIZE), %edx
jg 2f
pushl %ecx
call _bcopy
addl $12, %esp
popl %eax
subl $1, %ebx
jmp 2b
2: /* cleanup for overflow case */
addl $12, %esp
movl $RELOC(_bootinfo), %edx
subl %ebx, (%edx) /* correct number of entries */
1:
movl 16(%esp),%eax
testl %eax,%eax
jz 1f