sanchayanmaity/xv6-cs450
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This commit is contained in:
Robert Morris 2011-09-12 14:27:14 -04:00
parent 9b59dc44dc
commit 90a81b3228
1 changed files with 3 additions and 3 deletions
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6
bootasm.S
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@ -12,8 +12,8 @@
start: start:
cli # BIOS enabled interrupts; disable cli # BIOS enabled interrupts; disable
# Set up the important data segment registers (DS, ES, SS). # Zero data segment registers DS, ES, and SS.
xorw %ax,%ax # Segment number zero xorw %ax,%ax # Set %ax to zero
movw %ax,%ds # -> Data Segment movw %ax,%ds # -> Data Segment
movw %ax,%es # -> Extra Segment movw %ax,%es # -> Extra Segment
movw %ax,%ss # -> Stack Segment movw %ax,%ss # -> Stack Segment
@ -37,7 +37,7 @@ seta20.2:
outb %al,$0x60 outb %al,$0x60
# Switch from real to protected mode. Use a bootstrap GDT that makes # Switch from real to protected mode. Use a bootstrap GDT that makes
# virtual addresses map dierctly to physical addresses so that the # virtual addresses map directly to physical addresses so that the
# effective memory map doesn't change during the transition. # effective memory map doesn't change during the transition.
lgdt gdtdesc lgdt gdtdesc
movl %cr0, %eax movl %cr0, %eax