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Allocate space for storing of arguments at the end of conventional

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memory.
This commit is contained in:
Robert Nordier 1998-10-04 21:14:33 +00:00
parent 5f8edb2c4d
commit 18577050a0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=39961
2 changed files with 6 additions and 4 deletions
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5
sys/boot/i386/btx/btx/btx.S
View File

@ -13,7 +13,7 @@
# purpose.
#
# $Id: btx.s,v 1.4 1998/10/03 14:33:06 rnordier Exp $
# $Id: btx.s,v 1.5 1998/10/03 18:05:12 rnordier Exp $
#
# Memory layout.
@ -100,7 +100,7 @@ btx_hdr: .byte 0xeb # Machine ID
.byte 0xe # Header size
.ascii "BTX" # Magic
.byte 0x0 # Major version
.byte 0x56 # Minor version
.byte 0x57 # Minor version
.byte 0x0 # Flags
.word PAG_CNT-MEM_ORG>>0xc # Paging control
.word break-start # Text size
@ -213,6 +213,7 @@ init.8: xorl %ecx,%ecx # Zero
movl $MEM_USR,%edx # User base address
movzwl %ss:BDA_MEM,%eax # Get free memory
shll $0xa,%eax # To bytes
subl $0x1000,%eax # Less arg space
subl %edx,%eax # Less base
movb $SEL_UDATA,%cl # User data selector
pushl %ecx # Set SS

5
sys/boot/i386/btx/btx/btx.s
View File

@ -13,7 +13,7 @@
# purpose.
#
# $Id: btx.s,v 1.4 1998/10/03 14:33:06 rnordier Exp $
# $Id: btx.s,v 1.5 1998/10/03 18:05:12 rnordier Exp $
#
# Memory layout.
@ -100,7 +100,7 @@ btx_hdr: .byte 0xeb # Machine ID
.byte 0xe # Header size
.ascii "BTX" # Magic
.byte 0x0 # Major version
.byte 0x56 # Minor version
.byte 0x57 # Minor version
.byte 0x0 # Flags
.word PAG_CNT-MEM_ORG>>0xc # Paging control
.word break-start # Text size
@ -213,6 +213,7 @@ init.8: xorl %ecx,%ecx # Zero
movl $MEM_USR,%edx # User base address
movzwl %ss:BDA_MEM,%eax # Get free memory
shll $0xa,%eax # To bytes
subl $0x1000,%eax # Less arg space
subl %edx,%eax # Less base
movb $SEL_UDATA,%cl # User data selector
pushl %ecx # Set SS