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2005-07-17 Yoshinori Okuji <okuji@enbug.org>

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* kern/i386/pc/startup.S (gate_a20_try_system_control_port_a):
	When turning off Gate A20, skip the check and return immediately,
	because this is not fatal usually.
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okuji 2005-07-17 14:17:55 +00:00
parent ebedfd0003
commit e293232b8e
2 changed files with 13 additions and 2 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2005-07-17 Yoshinori Okuji <okuji@enbug.org>
* kern/i386/pc/startup.S (gate_a20_try_system_control_port_a):
When turning off Gate A20, skip the check and return immediately,
because this is not fatal usually.
2005-07-17 Yoshinori Okuji <okuji@enbug.org> 2005-07-17 Yoshinori Okuji <okuji@enbug.org>
* conf/i386-pc.rmk (pxeboot_img_LDFLAGS): The text address should * conf/i386-pc.rmk (pxeboot_img_LDFLAGS): The text address should

9
kern/i386/pc/startup.S
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@ -463,12 +463,17 @@ gate_a20_try_system_control_port_a:
jz 6f jz 6f
orb $0x02, %al orb $0x02, %al
6: outb $0x92 6: outb $0x92
/* When turning off Gate A20, do not check the state strictly,
because a failure is not fatal usually, and Gate A20 is always
on some modern machines. */
testb %dl, %dl
jz 7f
call gate_a20_check_state call gate_a20_check_state
cmpb %al, %dl cmpb %al, %dl
/* everything failed, so restart from the beginning */ /* everything failed, so restart from the beginning */
jnz gate_a20_try_bios jnz gate_a20_try_bios
ret 7: ret
gate_a20_check_state: gate_a20_check_state:
/* iterate the checking for a while */ /* iterate the checking for a while */