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Avoid interruptions while talking to keyboard controller.

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This commit is contained in:
rnordier 1998-10-27 20:19:24 +00:00
parent b845950ce7
commit 25598ad6e0
2 changed files with 16 additions and 12 deletions
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14
sys/boot/i386/boot2/boot1.S
View File

@ -13,7 +13,7 @@
# purpose.
#
# $Id: boot1.s,v 1.1.1.1 1998/10/12 21:16:26 rnordier Exp $
# $Id: boot1.s,v 1.2 1998/10/13 21:35:42 rnordier Exp $
.set MEM_REL,0x600 # Relocation address
.set MEM_ARG,0x800 # Arguments
@ -109,16 +109,18 @@ main.5: movwrm(_dx,MEM_ARG) # Save args
# Enable A20
seta20: inb $0x64,%al # Get status
testb $0x2,%al # Busy?
jnz seta20 # Yes
movb $0xd1,%al # Command: Write
outb %al,$0x64 # output port
seta20: cli # Disable interrupts
seta20.1: inb $0x64,%al # Get status
testb $0x2,%al # Busy?
jnz seta20.1 # Yes
movb $0xd1,%al # Command: Write
outb %al,$0x64 # output port
seta20.2: inb $0x64,%al # Get status
testb $0x2,%al # Busy?
jnz seta20.2 # Yes
movb $0xdf,%al # Enable
outb %al,$0x60 # A20
sti # Enable interrupts
ret # To caller
# Read from disk

14
sys/boot/i386/boot2/boot1.s
View File

@ -13,7 +13,7 @@
# purpose.
#
# $Id: boot1.s,v 1.1.1.1 1998/10/12 21:16:26 rnordier Exp $
# $Id: boot1.s,v 1.2 1998/10/13 21:35:42 rnordier Exp $
.set MEM_REL,0x600 # Relocation address
.set MEM_ARG,0x800 # Arguments
@ -109,16 +109,18 @@ main.5: movwrm(_dx,MEM_ARG) # Save args
# Enable A20
seta20: inb $0x64,%al # Get status
testb $0x2,%al # Busy?
jnz seta20 # Yes
movb $0xd1,%al # Command: Write
outb %al,$0x64 # output port
seta20: cli # Disable interrupts
seta20.1: inb $0x64,%al # Get status
testb $0x2,%al # Busy?
jnz seta20.1 # Yes
movb $0xd1,%al # Command: Write
outb %al,$0x64 # output port
seta20.2: inb $0x64,%al # Get status
testb $0x2,%al # Busy?
jnz seta20.2 # Yes
movb $0xdf,%al # Enable
outb %al,$0x60 # A20
sti # Enable interrupts
ret # To caller
# Read from disk