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Correct and clarify some comments.

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This commit is contained in:
Robert Nordier 1999-06-19 20:40:32 +00:00
parent 14de28bd64
commit 68aadbb9c9
1 changed files with 7 additions and 7 deletions
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14
sys/boot/i386/mbr/mbr.s
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@ -13,7 +13,7 @@
# purpose.
#
# $Id: $
# $Id: mbr.s,v 1.1.1.1 1999/05/24 22:36:24 rnordier Exp $
# Master boot record
@ -36,20 +36,20 @@ start: cld # String ops inc
sti # Enable interrupts
movwir(main-EXEC+LOAD,_si) # Source
movwir(main,_di) # Destination
movwir(0x200-(main-start),_cx) # Word count
movwir(0x200-(main-start),_cx) # Byte count
rep # Relocate
movsb # code
jmpnwi(main-LOAD+EXEC) # To relocated code
main: xorl %esi,%esi # No active found
main: xorl %esi,%esi # No active partition
movwir(partbl,_bx) # Partition table
movb $0x4,%cl # Entries
movb $0x4,%cl # Number of entries
main.1: cmpbr0(_ch,_bx_) # Null entry?
je main.2 # Yes
jg err_pt # If bit 7 unset
testl %esi,%esi # Active found?
jg err_pt # If 0x1..0x7f
testl %esi,%esi # Active already found?
jnz err_pt # Yes
movl %ebx,%esi # Keep place
movl %ebx,%esi # Point to active
main.2: addb $0x10,%bl # Till
loop main.1 # done
testl %esi,%esi # Active found?