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seabios/src/sercon.c

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// serial console support
//
// Copyright (C) 2016 Gerd Hoffmann <kraxel@redhat.com>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "biosvar.h" // SET_BDA
#include "bregs.h" // struct bregs
#include "stacks.h" // yield
#include "output.h" // dprintf
#include "util.h" // irqtimer_calc_ticks
#include "string.h" // memcpy
#include "romfile.h" // romfile_loadint
#include "hw/serialio.h" // SEROFF_IER
#include "cp437.h"
static u8 video_rows(void)
{
return GET_BDA(video_rows)+1;
}
static u8 video_cols(void)
{
return GET_BDA(video_cols);
}
static u8 cursor_pos_col(void)
{
u16 pos = GET_BDA(cursor_pos[0]);
return pos & 0xff;
}
static u8 cursor_pos_row(void)
{
u16 pos = GET_BDA(cursor_pos[0]);
return (pos >> 8) & 0xff;
}
static void cursor_pos_set(u8 row, u8 col)
{
u16 pos = ((u16)row << 8) | col;
SET_BDA(cursor_pos[0], pos);
}
/****************************************************************
* serial console output
****************************************************************/
VARLOW u16 sercon_port;
VARLOW u8 sercon_split;
VARLOW u8 sercon_enable;
VARFSEG struct segoff_s sercon_real_vga_handler;
/*
* We have a small output buffer here, for lazy output. That allows
* to avoid a whole bunch of control sequences for pointless cursor
* moves, so when logging the output it'll be *alot* less cluttered.
*
* sercon_char/attr is the actual output buffer.
* sercon_attr_last is the most recent attribute sent to the terminal.
* sercon_col_last is the most recent column sent to the terminal.
* sercon_row_last is the most recent row sent to the terminal.
*/
VARLOW u8 sercon_attr_last;
VARLOW u8 sercon_col_last;
VARLOW u8 sercon_row_last;
VARLOW u8 sercon_char;
VARLOW u8 sercon_attr = 0x07;
static VAR16 u8 sercon_cmap[8] = { '0', '4', '2', '6', '1', '5', '3', '7' };
static int sercon_splitmode(void)
{
return GET_LOW(sercon_split);
}
static void sercon_putchar(u8 chr)
{
u16 addr = GET_LOW(sercon_port);
u32 end = irqtimer_calc_ticks(0x0a);
#if 0
/* for visual control sequence debugging */
if (chr == '\x1b')
chr = '*';
#endif
for (;;) {
u8 lsr = inb(addr+SEROFF_LSR);
if ((lsr & 0x60) == 0x60) {
// Success - can write data
outb(chr, addr+SEROFF_DATA);
break;
}
if (irqtimer_check(end)) {
break;
}
yield();
}
}
static void sercon_term_reset(void)
{
sercon_putchar('\x1b');
sercon_putchar('c');
}
static void sercon_term_clear_screen(void)
{
sercon_putchar('\x1b');
sercon_putchar('[');
sercon_putchar('2');
sercon_putchar('J');
}
static void sercon_term_no_linewrap(void)
{
sercon_putchar('\x1b');
sercon_putchar('[');
sercon_putchar('?');
sercon_putchar('7');
sercon_putchar('l');
}
static void sercon_term_cursor_goto(u8 row, u8 col)
{
row++; col++;
sercon_putchar('\x1b');
sercon_putchar('[');
sercon_putchar('0' + row / 10);
sercon_putchar('0' + row % 10);
sercon_putchar(';');
sercon_putchar('0' + col / 10);
sercon_putchar('0' + col % 10);
sercon_putchar('H');
}
static void sercon_term_set_color(u8 fg, u8 bg, u8 bold)
{
sercon_putchar('\x1b');
sercon_putchar('[');
sercon_putchar('0');
if (fg != 7) {
sercon_putchar(';');
sercon_putchar('3');
sercon_putchar(GET_GLOBAL(sercon_cmap[fg & 7]));
}
if (bg != 0) {
sercon_putchar(';');
sercon_putchar('4');
sercon_putchar(GET_GLOBAL(sercon_cmap[bg & 7]));
}
if (bold) {
sercon_putchar(';');
sercon_putchar('1');
}
sercon_putchar('m');
}
static void sercon_set_attr(u8 attr)
{
if (attr == GET_LOW(sercon_attr_last))
return;
SET_LOW(sercon_attr_last, attr);
sercon_term_set_color((attr >> 0) & 7,
(attr >> 4) & 7,
attr & 0x08);
}
static void sercon_print_utf8(u8 chr)
{
u16 unicode = cp437_to_unicode(chr);
if (unicode < 0x7f) {
sercon_putchar(unicode);
} else if (unicode < 0x7ff) {
sercon_putchar(0xc0 | ((unicode >> 6) & 0x1f));
sercon_putchar(0x80 | ((unicode >> 0) & 0x3f));
} else {
sercon_putchar(0xe0 | ((unicode >> 12) & 0x0f));
sercon_putchar(0x80 | ((unicode >> 6) & 0x3f));
sercon_putchar(0x80 | ((unicode >> 0) & 0x3f));
}
}
static void sercon_cursor_pos_set(u8 row, u8 col)
{
if (!sercon_splitmode()) {
cursor_pos_set(row, col);
} else {
/* let vgabios update cursor */
}
}
static void sercon_lazy_cursor_sync(void)
{
u8 row = cursor_pos_row();
u8 col = cursor_pos_col();
if (GET_LOW(sercon_row_last) == row &&
GET_LOW(sercon_col_last) == col)
return;
if (col == 0 && GET_LOW(sercon_row_last) <= row) {
if (GET_LOW(sercon_col_last) != 0) {
sercon_putchar('\r');
SET_LOW(sercon_col_last, 0);
}
while (GET_LOW(sercon_row_last) < row) {
sercon_putchar('\n');
SET_LOW(sercon_row_last, GET_LOW(sercon_row_last)+1);
}
if (GET_LOW(sercon_row_last) == row &&
GET_LOW(sercon_col_last) == col)
return;
}
sercon_term_cursor_goto(row, col);
SET_LOW(sercon_row_last, row);
SET_LOW(sercon_col_last, col);
}
static void sercon_lazy_flush(void)
{
u8 chr, attr;
chr = GET_LOW(sercon_char);
attr = GET_LOW(sercon_attr);
if (chr) {
sercon_set_attr(attr);
sercon_print_utf8(chr);
SET_LOW(sercon_col_last, GET_LOW(sercon_col_last) + 1);
}
sercon_lazy_cursor_sync();
SET_LOW(sercon_attr, 0x07);
SET_LOW(sercon_char, 0x00);
}
static void sercon_lazy_cursor_update(u8 row, u8 col)
{
sercon_cursor_pos_set(row, col);
SET_LOW(sercon_row_last, row);
SET_LOW(sercon_col_last, col);
}
static void sercon_lazy_backspace(void)
{
u8 col;
sercon_lazy_flush();
col = cursor_pos_col();
if (col > 0) {
sercon_putchar(8);
sercon_lazy_cursor_update(cursor_pos_row(), col-1);
}
}
static void sercon_lazy_cr(void)
{
sercon_cursor_pos_set(cursor_pos_row(), 0);
}
static void sercon_lazy_lf(void)
{
u8 row;
row = cursor_pos_row() + 1;
if (row >= video_rows()) {
/* scrolling up */
row = video_rows()-1;
if (GET_LOW(sercon_row_last) > 0) {
SET_LOW(sercon_row_last, GET_LOW(sercon_row_last) - 1);
}
}
sercon_cursor_pos_set(row, cursor_pos_col());
}
static void sercon_lazy_move_cursor(void)
{
u8 col;
col = cursor_pos_col() + 1;
if (col >= video_cols()) {
sercon_lazy_cr();
sercon_lazy_lf();
} else {
sercon_cursor_pos_set(cursor_pos_row(), col);
}
}
static void sercon_lazy_putchar(u8 chr, u8 attr, u8 teletype)
{
if (cursor_pos_row() != GET_LOW(sercon_row_last) ||
cursor_pos_col() != GET_LOW(sercon_col_last)) {
sercon_lazy_flush();
}
SET_LOW(sercon_char, chr);
if (teletype)
sercon_lazy_move_cursor();
else
SET_LOW(sercon_attr, attr);
}
/* Set video mode */
static void sercon_1000(struct bregs *regs)
{
u8 clearscreen = !(regs->al & 0x80);
u8 mode = regs->al & 0x7f;
u8 rows, cols;
if (!sercon_splitmode()) {
switch (mode) {
case 0x00:
case 0x01:
case 0x04: /* 320x200 */
case 0x05: /* 320x200 */
cols = 40;
rows = 25;
regs->al = 0x30;
break;
case 0x02:
case 0x03:
case 0x06: /* 640x200 */
case 0x07:
default:
cols = 80;
rows = 25;
regs->al = 0x30;
break;
}
cursor_pos_set(0, 0);
SET_BDA(video_mode, mode);
SET_BDA(video_cols, cols);
SET_BDA(video_rows, rows-1);
SET_BDA(cursor_type, 0x0007);
} else {
/* let vgabios handle mode init */
}
SET_LOW(sercon_enable, mode <= 0x07);
SET_LOW(sercon_col_last, 0);
SET_LOW(sercon_row_last, 0);
SET_LOW(sercon_attr_last, 0);
sercon_term_reset();
sercon_term_no_linewrap();
if (clearscreen)
sercon_term_clear_screen();
}
/* Set text-mode cursor shape */
static void sercon_1001(struct bregs *regs)
{
/* show/hide cursor? */
SET_BDA(cursor_type, regs->cx);
}
/* Set cursor position */
static void sercon_1002(struct bregs *regs)
{
sercon_cursor_pos_set(regs->dh, regs->dl);
}
/* Get cursor position */
static void sercon_1003(struct bregs *regs)
{
regs->cx = GET_BDA(cursor_type);
regs->dh = cursor_pos_row();
regs->dl = cursor_pos_col();
}
/* Scroll up window */
static void sercon_1006(struct bregs *regs)
{
sercon_lazy_flush();
if (regs->al == 0) {
/* clear rect, do only in case this looks like a fullscreen clear */
if (regs->ch == 0 &&
regs->cl == 0 &&
regs->dh == video_rows()-1 &&
regs->dl == video_cols()-1) {
sercon_set_attr(regs->bh);
sercon_term_clear_screen();
}
} else {
sercon_putchar('\r');
sercon_putchar('\n');
}
}
/* Read character and attribute at cursor position */
static void sercon_1008(struct bregs *regs)
{
regs->ah = 0x07;
regs->bh = ' ';
}
/* Write character and attribute at cursor position */
static void sercon_1009(struct bregs *regs)
{
u16 count = regs->cx;
if (count == 1) {
sercon_lazy_putchar(regs->al, regs->bl, 0);
} else if (regs->al == 0x20 &&
video_rows() * video_cols() == count &&
cursor_pos_row() == 0 &&
cursor_pos_col() == 0) {
/* override everything with spaces -> this is clear screen */
sercon_lazy_flush();
sercon_set_attr(regs->bl);
sercon_term_clear_screen();
} else {
sercon_lazy_flush();
sercon_set_attr(regs->bl);
while (count) {
sercon_print_utf8(regs->al);
count--;
}
sercon_term_cursor_goto(cursor_pos_row(),
cursor_pos_col());
}
}
/* Teletype output */
static void sercon_100e(struct bregs *regs)
{
switch (regs->al) {
case 7:
sercon_putchar(0x07);
break;
case 8:
sercon_lazy_backspace();
break;
case '\r':
sercon_lazy_cr();
break;
case '\n':
sercon_lazy_lf();
break;
default:
sercon_lazy_putchar(regs->al, 0, 1);
break;
}
}
/* Get current video mode */
static void sercon_100f(struct bregs *regs)
{
regs->al = GET_BDA(video_mode);
regs->ah = GET_BDA(video_cols);
}
/* VBE 2.0 */
static void sercon_104f(struct bregs *regs)
{
if (!sercon_splitmode()) {
regs->ax = 0x0100;
} else {
// Disable sercon entry point on any vesa modeset
if (regs->al == 0x02)
SET_LOW(sercon_enable, 0);
}
}
static void sercon_10XX(struct bregs *regs)
{
warn_unimplemented(regs);
}
void VISIBLE16
handle_sercon(struct bregs *regs)
{
if (!CONFIG_SERCON)
return;
if (!GET_LOW(sercon_port))
return;
switch (regs->ah) {
case 0x01:
case 0x02:
case 0x03:
case 0x08:
case 0x0f:
if (sercon_splitmode())
/* nothing, vgabios handles it */
return;
}
switch (regs->ah) {
case 0x00: sercon_1000(regs); break;
case 0x01: sercon_1001(regs); break;
case 0x02: sercon_1002(regs); break;
case 0x03: sercon_1003(regs); break;
case 0x06: sercon_1006(regs); break;
case 0x08: sercon_1008(regs); break;
case 0x09: sercon_1009(regs); break;
case 0x0e: sercon_100e(regs); break;
case 0x0f: sercon_100f(regs); break;
case 0x4f: sercon_104f(regs); break;
default: sercon_10XX(regs); break;
}
}
void sercon_setup(void)
{
if (!CONFIG_SERCON)
return;
struct segoff_s seabios, vgabios;
u16 addr;
addr = romfile_loadint("etc/sercon-port", 0);
if (!addr)
return;
dprintf(1, "sercon: using ioport 0x%x\n", addr);
if (CONFIG_DEBUG_SERIAL)
if (addr == CONFIG_DEBUG_SERIAL_PORT)
ScreenAndDebug = 0;
vgabios = GET_IVT(0x10);
seabios = FUNC16(entry_10);
if (vgabios.seg != seabios.seg ||
vgabios.offset != seabios.offset) {
dprintf(1, "sercon: configuring in splitmode (vgabios %04x:%04x)\n",
vgabios.seg, vgabios.offset);
sercon_real_vga_handler = vgabios;
SET_LOW(sercon_split, 1);
} else {
dprintf(1, "sercon: configuring as primary display\n");
sercon_real_vga_handler = seabios;
}
SET_IVT(0x10, FUNC16(entry_sercon));
SET_LOW(sercon_port, addr);
outb(0x03, addr + SEROFF_LCR); // 8N1
outb(0x01, addr + 0x02); // enable fifo
}
/****************************************************************
* serial input
****************************************************************/
VARLOW u8 rx_buf[16];
VARLOW u8 rx_bytes;
static VAR16 struct {
char seq[4];
u8 len;
u16 keycode;
} termseq[] = {
{ .seq = "OP", .len = 2, .keycode = 0x3b00 }, // F1
{ .seq = "OQ", .len = 2, .keycode = 0x3c00 }, // F2
{ .seq = "OR", .len = 2, .keycode = 0x3d00 }, // F3
{ .seq = "OS", .len = 2, .keycode = 0x3e00 }, // F4
{ .seq = "[15~", .len = 4, .keycode = 0x3f00 }, // F5
{ .seq = "[17~", .len = 4, .keycode = 0x4000 }, // F6
{ .seq = "[18~", .len = 4, .keycode = 0x4100 }, // F7
{ .seq = "[19~", .len = 4, .keycode = 0x4200 }, // F8
{ .seq = "[20~", .len = 4, .keycode = 0x4300 }, // F9
{ .seq = "[21~", .len = 4, .keycode = 0x4400 }, // F10
{ .seq = "[23~", .len = 4, .keycode = 0x5700 }, // F11
{ .seq = "[24~", .len = 4, .keycode = 0x5800 }, // F12
{ .seq = "[2~", .len = 3, .keycode = 0x52e0 }, // insert
{ .seq = "[3~", .len = 3, .keycode = 0x53e0 }, // delete
{ .seq = "[5~", .len = 3, .keycode = 0x49e0 }, // page up
{ .seq = "[6~", .len = 3, .keycode = 0x51e0 }, // page down
{ .seq = "[A", .len = 2, .keycode = 0x48e0 }, // up
{ .seq = "[B", .len = 2, .keycode = 0x50e0 }, // down
{ .seq = "[C", .len = 2, .keycode = 0x4de0 }, // right
{ .seq = "[D", .len = 2, .keycode = 0x4be0 }, // left
{ .seq = "[H", .len = 2, .keycode = 0x47e0 }, // home
{ .seq = "[F", .len = 2, .keycode = 0x4fe0 }, // end
};
static void shiftbuf(int remove)
{
int i, remaining;
remaining = GET_LOW(rx_bytes) - remove;
SET_LOW(rx_bytes, remaining);
for (i = 0; i < remaining; i++)
SET_LOW(rx_buf[i], GET_LOW(rx_buf[i + remove]));
}
static int cmpbuf(int seq)
{
int chr, len;
len = GET_GLOBAL(termseq[seq].len);
if (GET_LOW(rx_bytes) < len + 1)
return 0;
for (chr = 0; chr < len; chr++)
if (GET_GLOBAL(termseq[seq].seq[chr]) != GET_LOW(rx_buf[chr + 1]))
return 0;
return 1;
}
static int findseq(void)
{
int seq;
for (seq = 0; seq < ARRAY_SIZE(termseq); seq++)
if (cmpbuf(seq))
return seq;
return -1;
}
void
sercon_check_event(void)
{
if (!CONFIG_SERCON)
return;
u16 addr = GET_LOW(sercon_port);
u16 keycode;
u8 byte, count = 0;
int seq;
// check to see if there is a active serial port
if (!addr)
return;
if (inb(addr + SEROFF_LSR) == 0xFF)
return;
// flush pending output
sercon_lazy_flush();
// read all available data
while (inb(addr + SEROFF_LSR) & 0x01) {
byte = inb(addr + SEROFF_DATA);
u8 rb = GET_LOW(rx_bytes);
if (rb < sizeof(rx_buf)) {
SET_LOW(rx_buf[rb], byte);
SET_LOW(rx_bytes, rb + 1);
count++;
}
}
for (;;) {
// no (more) input data
u8 rb = GET_LOW(rx_bytes);
if (!rb)
return;
// lookup escape sequences
u8 next_char = GET_LOW(rx_buf[0]);
if (rb > 1 && next_char == 0x1b) {
seq = findseq();
if (seq >= 0) {
enqueue_key(GET_GLOBAL(termseq[seq].keycode));
shiftbuf(GET_GLOBAL(termseq[seq].len) + 1);
continue;
}
}
// Seems we got a escape sequence we didn't recognise.
// -> If we received data wait for more, maybe it is just incomplete.
if (next_char == 0x1b && count)
return;
// Handle input as individual char.
keycode = ascii_to_keycode(next_char);
if (keycode)
enqueue_key(keycode);
shiftbuf(1);
}
}
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