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2008-07-21 Bean <bean123ch@gmail.com> 

* kern/i386/pc/startup.S (gate_a20_try_bios): Change test order for
	a20. Run keyboard test last, as it will cause macbook to halt.
This commit is contained in:
bean 2008-07-21 10:40:01 +00:00
parent b095e2adbf
commit 18eeaf04d7
2 changed files with 30 additions and 21 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2008-07-21 Bean <bean123ch@gmail.com>
* kern/i386/pc/startup.S (gate_a20_try_bios): Change test order for
a20. Run keyboard test last, as it will cause macbook to halt.
2008-07-18 Pavel Roskin <proski@gnu.org>
* kern/dl.c: Go back to using GRUB_CPU_SIZEOF_VOID_P. We cannot

46
kern/i386/pc/startup.S
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@ -386,9 +386,32 @@ gate_a20_try_bios:
popl %ebp
call gate_a20_check_state
cmpb %al, %dl
jnz gate_a20_try_keyboard_controller
jnz gate_a20_try_system_control_port_a
ret
gate_a20_try_system_control_port_a:
/*
* In macbook, the keyboard test would hang the machine, so we move
* this forward.
*/
/* fourth, try the system control port A */
inb $0x92
andb $(~0x03), %al
testb %dl, %dl
jz 6f
orb $0x02, %al
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
cmpb %al, %dl
jnz gate_a20_try_keyboard_controller
7: ret
gate_a20_flush_keyboard_buffer:
inb $0x64
andb $0x02, %al
@ -425,30 +448,11 @@ gate_a20_try_keyboard_controller:
outb $0x64
call gate_a20_flush_keyboard_buffer
call gate_a20_check_state
cmpb %al, %dl
jnz gate_a20_try_system_control_port_a
ret
gate_a20_try_system_control_port_a:
/* fourth, try the system control port A */
inb $0x92
andb $(~0x03), %al
testb %dl, %dl
jz 6f
orb $0x02, %al
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
cmpb %al, %dl
/* everything failed, so restart from the beginning */
jnz gate_a20_try_bios
7: ret
ret
gate_a20_check_state:
/* iterate the checking for a while */