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Wait for ACKs when setting the mode

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-08-23 11:26:28 +02:00
parent b88904ca7f
commit 7ae3eb6232
2 changed files with 31 additions and 9 deletions
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2
include/grub/at_keyboard.h
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@ -27,6 +27,8 @@
#define KEYBOARD_AT_TRANSLATE 0x40
#define GRUB_AT_ACK 0xfa
#define KEYBOARD_ISMAKE(x) !((x) & 0x80)
#define KEYBOARD_ISREADY(x) ((x) & 0x01)
#define KEYBOARD_SCANCODE(x) ((x) & 0x7f)

36
term/at_keyboard.c
View file

@ -23,6 +23,7 @@
#include <grub/misc.h>
#include <grub/term.h>
#include <grub/keyboard_layouts.h>
#include <grub/time.h>
static short at_keyboard_status = 0;
static int e0_received = 0;
@ -225,19 +226,29 @@ grub_keyboard_controller_write (grub_uint8_t c)
}
static int
write_mode (int mode)
wait_ack (void)
{
grub_uint8_t ack;
grub_uint64_t endtime = grub_get_time_ms () + 20;
do
{
ack = grub_inb (KEYBOARD_REG_DATA);
}
while (ack != GRUB_AT_ACK && grub_get_time_ms () < endtime);
grub_dprintf ("atkeyb", "Ack 0x%02x\n", ack);
return ack == GRUB_AT_ACK;
}
static int
write_mode (int mode)
{
keyboard_controller_wait_until_ready ();
grub_outb (0xf0, KEYBOARD_REG_DATA);
keyboard_controller_wait_until_ready ();
grub_outb (mode, KEYBOARD_REG_DATA);
keyboard_controller_wait_until_ready ();
ack = grub_inb (KEYBOARD_REG_DATA);
if (ack != 0xfa)
return 0;
return 1;
return wait_ack ();
}
static int
@ -254,7 +265,7 @@ query_mode (void)
do
ret = grub_inb (KEYBOARD_REG_DATA);
while (ret == 0xfa);
while (ret == GRUB_AT_ACK);
/* QEMU translates the set even in no-translate mode. */
if (ret == 0x43 || ret == 1)
@ -275,6 +286,7 @@ set_scancodes (void)
knowledge. Assume XT. */
if (!grub_keyboard_orig_set)
{
grub_dprintf ("atkeyb", "No sets support assumed\n");
current_set = 1;
return;
}
@ -284,11 +296,13 @@ set_scancodes (void)
write_mode (2);
current_set = query_mode ();
grub_dprintf ("atkeyb", "returned set %d\n", current_set);
if (current_set == 2)
return;
write_mode (1);
current_set = query_mode ();
grub_dprintf ("atkeyb", "returned set %d\n", current_set);
if (current_set == 1)
return;
grub_printf ("No supported scancode set found\n");
@ -334,7 +348,7 @@ fetch_key (int *is_break)
}
/* Setting LEDs may generate ACKs. */
if (at_key == 0xfa)
if (at_key == GRUB_AT_ACK)
return -1;
was_ext = e0_received;
@ -540,8 +554,14 @@ grub_keyboard_controller_init (struct grub_term_input *term __attribute__ ((unus
pending_key = -1;
at_keyboard_status = 0;
/* Drain input buffer. */
while (KEYBOARD_ISREADY (grub_inb (KEYBOARD_REG_STATUS)))
while (1)
{
keyboard_controller_wait_until_ready ();
if (! KEYBOARD_ISREADY (grub_inb (KEYBOARD_REG_STATUS)))
break;
keyboard_controller_wait_until_ready ();
grub_inb (KEYBOARD_REG_DATA);
}
grub_keyboard_controller_orig = grub_keyboard_controller_read ();
set_scancodes ();
keyboard_controller_led (led_status);