vbatts/grub
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

New terminal outputs using serial: morse and spkmodem.

Browse source
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2013-01-16 20:39:54 +01:00
parent 34f71cb866
commit b78d6c32e3
10 changed files with 512 additions and 132 deletions
Download patch file Download diff file Expand all files Collapse all files

35
grub-core/kern/i386/pit.c
View file

@ -20,37 +20,30 @@
#include <grub/i386/io.h>
#include <grub/i386/pit.h>
#define TIMER2_REG_CONTROL 0x42
#define TIMER_REG_COMMAND 0x43
#define TIMER2_REG_LATCH 0x61
#define TIMER2_SELECT 0x80
#define TIMER_ENABLE_LSB 0x20
#define TIMER_ENABLE_MSB 0x10
#define TIMER2_LATCH 0x20
#define TIMER2_SPEAKER 0x02
#define TIMER2_GATE 0x01
void
grub_pit_wait (grub_uint16_t tics)
{
/* Disable timer2 gate and speaker. */
grub_outb (grub_inb (TIMER2_REG_LATCH) & ~ (TIMER2_SPEAKER | TIMER2_GATE),
TIMER2_REG_LATCH);
grub_outb (grub_inb (GRUB_PIT_SPEAKER_PORT)
& ~ (GRUB_PIT_SPK_DATA | GRUB_PIT_SPK_TMR2),
GRUB_PIT_SPEAKER_PORT);
/* Set tics. */
grub_outb (TIMER2_SELECT | TIMER_ENABLE_LSB | TIMER_ENABLE_MSB, TIMER_REG_COMMAND);
grub_outb (tics & 0xff, TIMER2_REG_CONTROL);
grub_outb (tics >> 8, TIMER2_REG_CONTROL);
grub_outb (GRUB_PIT_CTRL_SELECT_2 | GRUB_PIT_CTRL_READLOAD_WORD,
GRUB_PIT_CTRL);
grub_outb (tics & 0xff, GRUB_PIT_COUNTER_2);
grub_outb (tics >> 8, GRUB_PIT_COUNTER_2);
/* Enable timer2 gate, keep speaker disabled. */
grub_outb ((grub_inb (TIMER2_REG_LATCH) & ~ TIMER2_SPEAKER) | TIMER2_GATE,
TIMER2_REG_LATCH);
grub_outb ((grub_inb (GRUB_PIT_SPEAKER_PORT) & ~ GRUB_PIT_SPK_DATA)
| GRUB_PIT_SPK_TMR2,
GRUB_PIT_SPEAKER_PORT);
/* Wait. */
while ((grub_inb (TIMER2_REG_LATCH) & TIMER2_LATCH) == 0x00);
while ((grub_inb (GRUB_PIT_SPEAKER_PORT) & GRUB_PIT_SPK_TMR2_LATCH) == 0x00);
/* Disable timer2 gate and speaker. */
grub_outb (grub_inb (TIMER2_REG_LATCH) & ~ (TIMER2_SPEAKER | TIMER2_GATE),
TIMER2_REG_LATCH);
grub_outb (grub_inb (GRUB_PIT_SPEAKER_PORT)
& ~ (GRUB_PIT_SPK_DATA | GRUB_PIT_SPK_TMR2),
GRUB_PIT_SPEAKER_PORT);
}