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#include <stdint.h>
#include "settings.h"
#include "shutdown.h"
#include "window.h"
#include "drive.h"
#include "panic.h"
#include "pmap.h"
#include "util.h"
#include "kbd.h"
#include "log.h"
#define SCANTAB_DIR "sys/scantabs/"
#define SCANTAB_DIR_LEN 13
enum {
PS2_CMD = 0x64,
PS2_DATA = 0x60
};
enum {
PS2C_READ_CONFIG = 0x20,
PS2C_WRITE_CONFIG = 0x60,
PS2C_DISABLE = 0xad,
PS2C_ENABLE = 0xae
};
enum {
PS2S_CODE_READY = 0x01
};
enum {
PS2G_XT_COMPAT = 0x40
};
static uint32_t n_scantabs;
static struct scantab_info {
uint8_t *scantab;
uint8_t prefix_length;
uint8_t prefix[256];
} *scantabs;
enum {
ST_ILLEGAL,
ST_SUBTABLE,
ST_FLIP,
ST_SKIP
};
#define LAYOUT_NAME_MAX_LEN 31
static char scantab_path[SCANTAB_DIR_LEN + LAYOUT_NAME_MAX_LEN + 5] = SCANTAB_DIR;
void init_kbd() {
outb(PS2_CMD, PS2C_READ_CONFIG);
uint8_t config = inb(PS2_DATA);
outb(PS2_CMD, PS2C_WRITE_CONFIG);
outb(PS2_DATA, config | PS2G_XT_COMPAT);
uint32_t layout_len;
if (!try_get_sz_setting("kbd-layout", scantab_path + SCANTAB_DIR_LEN, LAYOUT_NAME_MAX_LEN, &layout_len))
PANIC("keyboard layout not found in settings file.");
if (layout_len == LAYOUT_NAME_MAX_LEN)
logf(LOG_WARN, "keyboard layout name potentially cropped.");
scantab_path[SCANTAB_DIR_LEN + layout_len] = '.';
scantab_path[SCANTAB_DIR_LEN + layout_len + 1] = 's';
scantab_path[SCANTAB_DIR_LEN + layout_len + 2] = 'c';
scantab_path[SCANTAB_DIR_LEN + layout_len + 3] = 't';
scantab_path[SCANTAB_DIR_LEN + layout_len + 4] = '\0';
logf(LOG_INFO, "Using scantab file at \"%s\".", scantab_path);
file_id_t stf = drives->get_file(drives, scantab_path);
if (!stf)
PANIC("could not load scantab file.");
fmcpy(&n_scantabs, drives, stf, 0, 4);
scantabs = allocate_kernel_pages((sizeof(struct scantab_info) * n_scantabs - 1) / 4096 + 1);
uint32_t fi = 0x10;
void *st_data = allocate_kernel_pages((n_scantabs - 1) / 8 + 1);
for (uint32_t n = 0; n < n_scantabs; ++n) {
uint32_t data_sector;
fmcpy(&data_sector, drives, stf, fi, 4);
drives->load_sector(drives, stf, data_sector, st_data + 512 * n);
scantabs[n].scantab = st_data + 512 * n;
uint8_t pl;
fmcpy(&pl, drives, stf, fi + 4, 1);
scantabs[n].prefix_length = pl;
fmcpy(scantabs[n].prefix, drives, stf, fi + 5, pl);
fi += 5 + pl;
if (fi & 0xf)
fi = (fi & ~0xf) + 0x10;
}
drives->free_file(drives, stf);
}
static uint8_t last_code_byte = 0;
static inline uint8_t get_next_code_byte() {
uint8_t cb;
do
cb = inb(PS2_DATA);
while (cb == last_code_byte);
last_code_byte = cb;
return cb;
}
static enum key_modifiers_t keymods = 0;
enum kbd_isr_result on_kbd_isr() {
//logf(LOG_INFO, "on_kbd_isr()");
while (inb(PS2_CMD) & PS2S_CODE_READY) {
last_code_byte = 0;
uint8_t code[256];
uint8_t code_i = 0;
sub_table:
code[code_i] = get_next_code_byte();
const uint8_t *table;
for (uint32_t i = 0; i < n_scantabs; ++i) {
if (scantabs[i].prefix_length != code_i)
continue;
for (uint8_t j = 0; j < code_i; ++j)
if (scantabs[i].prefix[j] != code[j])
goto next_table;
table = scantabs[i].scantab;
goto got_table;
next_table:;
}
PANIC("Couldn't find scantable");
got_table:;
bool is_up = false;
flipped_table:;
uint8_t entry = table[code[code_i]];
switch (entry) {
case ST_ILLEGAL:
PANIC("Illegal scancode encountered");
case ST_SUBTABLE:
++code_i;
goto sub_table;
case ST_FLIP:
if (is_up)
PANIC("Recursive flip in scantable");
table += 0x100;
is_up = true;
goto flipped_table;
case ST_SKIP:
continue;
}
switch ((enum key_id_t)entry) {
case KEY_LEFT_SHIFT:
if (is_up)
keymods &= ~LSHIFT;
else
keymods |= LSHIFT;
break;
case KEY_RIGHT_SHIFT:
if (is_up)
keymods &= ~RSHIFT;
else
keymods |= RSHIFT;
break;
case KEY_LEFT_CONTROL:
if (is_up)
keymods &= ~LCTRL;
else
keymods |= LCTRL;
break;
case KEY_RIGHT_CONTROL:
if (is_up)
keymods &= ~RCTRL;
else
keymods |= RCTRL;
break;
case KEY_LEFT_ALT:
if (is_up)
keymods &= ~LALT;
else
keymods |= LALT;
break;
case KEY_RIGHT_ALT:
if (is_up)
keymods &= ~RALT;
else
keymods |= RALT;
break;
case KEY_LEFT_WIN:
if (is_up)
keymods &= ~LWIN;
else
keymods |= LWIN;
break;
case KEY_RIGHT_WIN:
if (is_up)
keymods &= ~RWIN;
else
keymods |= RWIN;
break;
case KEY_CAPS_LOCK:
if (!is_up)
keymods ^= CAPS;
break;
case KEY_NUM_LOCK:
if (!is_up)
keymods ^= NUM;
break;
case KEY_SCROLL_LOCK:
if (!is_up)
keymods ^= SCROLL;
break;
case KEY_INSERT:
if (!is_up)
keymods ^= INSERT;
break;
default:
break;
}
if (!is_up && (entry == KEY_PAUSE) && (keymods & ALTS))
return (keymods & SHIFTS) ? SHIFT_DUMP : DUMP;
if (!is_up && (entry == KEY_Q) && (keymods & WINS) && (keymods & SHIFTS))
shutdown();
on_action((struct window_action){
.action_type = is_up ? KEY_UP : KEY_DOWN,
.as_key = (struct key_packet){
.key_id = entry,
.modifiers = keymods
}
});
}
return NORMAL;
}
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