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added tty

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This commit is contained in:
Anders Holck
2026-04-11 00:21:06 +02:00
parent c870ab8561
commit 554d32f7e8
5 changed files with 366 additions and 0 deletions
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tty/Makefile
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tty: tty.S
as -o tty.o tty.S
ld -o tty tty.o
clean:
rm -f tty tty.o
tty/tty.S
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.intel_syntax noprefix
# syscall numbers
.equ SYS_READ, 0
.equ SYS_WRITE, 1
.equ SYS_OPEN, 2
.equ SYS_CLOSE, 3
.equ SYS_POLL, 7
.equ SYS_IOCTL, 16
.equ SYS_EXIT, 60
# ioctl / termios
.equ TCGETS, 0x5401
.equ TCSETS, 0x5402
.equ TERMIOS_SIZE, 60 # sizeof(struct termios) on x86_64
# termios c_lflag bits to clear
.equ ICANON, 0x2
.equ ECHO, 0x8
.equ ISIG, 0x1
# termios c_iflag bits to clear
.equ IGNBRK, 0x1
.equ BRKINT, 0x2
.equ PARMRK, 0x8
.equ ISTRIP, 0x20
.equ INLCR, 0x40
.equ IGNCR, 0x80
.equ ICRNL, 0x100
.equ IXON, 0x400
# termios c_oflag bits to clear
.equ OPOST, 0x1
# termios c_cflag
.equ CSIZE, 0x30
.equ PARENB, 0x100
.equ CS8, 0x30
.equ CLOCAL, 0x800
.equ CREAD, 0x80
# baud
.equ B115200, 0x1002
# open flags
.equ O_RDWR, 0x2
.equ O_NOCTTY, 0x100
# poll
.equ POLLIN, 0x1
.equ POLLFD_SIZE, 8
# termios field offsets
.equ OFLAG_OFF, 4
.equ CFLAG_OFF, 8
.equ LFLAG_OFF, 12
.equ CC_OFF, 17 # c_cc array offset
.equ VMIN, 6 # c_cc index
.equ VTIME, 5 # c_cc index
.equ ISPEED_OFF, 52
.equ OSPEED_OFF, 56
.data
devpath: .asciz "/dev/ttyUSB0"
banner: .ascii "Holck's minitty - ctrl-d to exit!\r\n"
.equ BANNER_LEN, . - banner
.bss
.align 8
serial_fd: .quad 0
old_termios: .space TERMIOS_SIZE
raw_termios: .space TERMIOS_SIZE
ser_termios: .space TERMIOS_SIZE
pollfds: .space POLLFD_SIZE * 2 # two pollfd structs
buf: .space 256
.text
.globl _start
_start:
# Open serial port
mov rdi, offset devpath
mov rsi, O_RDWR | O_NOCTTY
xor rdx, rdx
mov rax, SYS_OPEN
syscall
test rax, rax
js exit_fail
mov [serial_fd], rax
# Get serial termios & configure
mov rdi, rax
mov rsi, TCGETS
lea rdx, [ser_termios]
mov rax, SYS_IOCTL
syscall
# cfmakeraw equivalent for serial
lea rbx, [ser_termios]
# iflag: clear everything raw clears
and dword ptr [rbx], ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON)
# oflag: clear OPOST
and dword ptr [rbx + OFLAG_OFF], ~OPOST
# cflag: CS8, CLOCAL, CREAD, no parity
mov eax, [rbx + CFLAG_OFF]
and eax, ~(CSIZE | PARENB)
or eax, CS8 | CLOCAL | CREAD
mov [rbx + CFLAG_OFF], eax
# lflag: clear ECHO, ICANON, ISIG
and dword ptr [rbx + LFLAG_OFF], ~(ECHO|ICANON|ISIG)
# VMIN=0, VTIME=1
mov byte ptr [rbx + CC_OFF + VMIN], 0
mov byte ptr [rbx + CC_OFF + VTIME], 1
# baud 115200
mov dword ptr [rbx + ISPEED_OFF], B115200
mov dword ptr [rbx + OSPEED_OFF], B115200
mov rdi, [serial_fd]
mov rsi, TCSETS
lea rdx, [ser_termios]
mov rax, SYS_IOCTL
syscall
# Save stdin termios
xor rdi, rdi
mov rsi, TCGETS
lea rdx, [old_termios]
mov rax, SYS_IOCTL
syscall
# Copy old to raw and make raw
lea rsi, [old_termios]
lea rdi, [raw_termios]
mov rcx, TERMIOS_SIZE
rep movsb
lea rbx, [raw_termios]
and dword ptr [rbx], ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON)
and dword ptr [rbx + OFLAG_OFF], ~OPOST
mov eax, [rbx + CFLAG_OFF]
and eax, ~(CSIZE | PARENB)
or eax, CS8
mov [rbx + CFLAG_OFF], eax
and dword ptr [rbx + LFLAG_OFF], ~(ECHO|ICANON|ISIG)
mov byte ptr [rbx + CC_OFF + VMIN], 1
mov byte ptr [rbx + CC_OFF + VTIME], 0
# Set stdin raw
xor rdi, rdi
mov rsi, TCSETS
lea rdx, [raw_termios]
mov rax, SYS_IOCTL
syscall
# Print banner
mov rdi, 1
lea rsi, [banner]
mov rdx, BANNER_LEN
mov rax, SYS_WRITE
syscall
# Setup pollfds: [0]=stdin, [1]=serial
lea rbx, [pollfds]
mov dword ptr [rbx], 0 # fd = stdin
mov word ptr [rbx + 4], POLLIN # events
mov word ptr [rbx + 6], 0 # revents
mov eax, [serial_fd]
mov dword ptr [rbx + 8], eax # fd = serial
mov word ptr [rbx + 12], POLLIN
mov word ptr [rbx + 14], 0
poll_loop:
lea rdi, [pollfds]
mov rsi, 2
mov rdx, -1 # infinite timeout
mov rax, SYS_POLL
syscall
# Check stdin
lea rbx, [pollfds]
movzx eax, word ptr [rbx + 6] # revents
test eax, POLLIN
jz check_serial
# Read stdin
xor rdi, rdi
lea rsi, [buf]
mov rdx, 256
mov rax, SYS_READ
syscall
test rax, rax
jle done
# Scan for Ctrl-D (0x04)
mov rcx, rax
lea rsi, [buf]
scan:
cmp byte ptr [rsi], 4
je done
inc rsi
dec rcx
jnz scan
# Write to serial
mov rdi, [serial_fd]
lea rsi, [buf]
mov rdx, rax
mov rax, SYS_WRITE
syscall
check_serial:
lea rbx, [pollfds]
movzx eax, word ptr [rbx + 14] # revents
test eax, POLLIN
jz poll_loop
# Read serial
mov rdi, [serial_fd]
lea rsi, [buf]
mov rdx, 256
mov rax, SYS_READ
syscall
test rax, rax
jle poll_loop
# Write to stdout
mov rdx, rax
mov rdi, 1
lea rsi, [buf]
mov rax, SYS_WRITE
syscall
jmp poll_loop
done:
# Restore stdin termios
xor rdi, rdi
mov rsi, TCSETS
lea rdx, [old_termios]
mov rax, SYS_IOCTL
syscall
# Close serial
mov rdi, [serial_fd]
mov rax, SYS_CLOSE
syscall
xor rdi, rdi
mov rax, SYS_EXIT
syscall
exit_fail:
mov rdi, 1
mov rax, SYS_EXIT
syscall
tty_c/Makefile
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tty: tty.c
$(CC) -o $@ $<
clean:
rm -f tty
tty_c/tty.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <poll.h>
int main(void) {
int fd = open("/dev/ttyUSB0", O_RDWR | O_NOCTTY);
if (fd < 0) { perror("open"); return 1; }
// Configure serial port
struct termios tty;
tcgetattr(fd, &tty);
cfmakeraw(&tty);
cfsetspeed(&tty, B115200);
tty.c_cflag |= CLOCAL | CREAD;
tty.c_cc[VMIN] = 0;
tty.c_cc[VTIME] = 1;
tcsetattr(fd, TCSANOW, &tty);
// Set stdin to raw mode
struct termios old_stdin, raw_stdin;
tcgetattr(STDIN_FILENO, &old_stdin);
raw_stdin = old_stdin;
cfmakeraw(&raw_stdin);
tcsetattr(STDIN_FILENO, TCSANOW, &raw_stdin);
write(STDOUT_FILENO, "Holcks minitty - ctrl-d to exit\r\n", 33);
struct pollfd fds[2] = {
{ .fd = STDIN_FILENO, .events = POLLIN },
{ .fd = fd, .events = POLLIN },
};
char buf[256];
while (1) {
poll(fds, 2, -1);
if (fds[0].revents & POLLIN) {
int n = read(STDIN_FILENO, buf, sizeof(buf));
if (n > 0) {
for (int i = 0; i < n; i++)
if (buf[i] == 4) goto done; // Ctrl-D
write(fd, buf, n);
}
}
if (fds[1].revents & POLLIN) {
int n = read(fd, buf, sizeof(buf));
if (n > 0) write(STDOUT_FILENO, buf, n);
}
}
done:
tcsetattr(STDIN_FILENO, TCSANOW, &old_stdin);
close(fd);
return 0;
}
vedit/worklog.md
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## 2026-04-10 20:39:49
User [chat]: Hello!
AI: Hello, Anders! How are you doing today? Is there anything specific you'd like to talk about or any questions I can help you with?
## 2026-04-10 20:40:00
User [chat]: What are you doing?
AI: I'm currently processing your messages and waiting to see how I can help you, Anders! Since I'm an AI, I don't have a physical life, so I spend my time analyzing text, answering questions, and chattin
## 2026-04-10 20:41:29
User [chat]: How can I control fans in Linux?
AI: Controlling fans in Linux, Anders, is a bit of a delicate process because it requires interacting directly with your motherboard's hardware controllers. The most standard approach involves using a com
## 2026-04-10 21:45:34
User [chat]: How can I control fans in Linux?
AI: Since you are asking again, Anders, perhaps you are looking for a more structured way to approach this, or maybe you are looking for alternatives to the command-line method I mentioned previously. Let
## 2026-04-10 23:24:11
User: Are you here?
AI: Yes, I am here.
## 2026-04-10 23:24:17
User [chat]: Hello
AI: Hello there. How are you doing today, Anders?
## 2026-04-10 23:24:25
User [chat]: Not much
AI: I'm sorry to hear that. Is everything okay? Or are you just having a quiet day?
## 2026-04-10 23:26:19
User [chat]: All is ok!
AI: That's good to hear! Sometimes just having an okay day is exactly what you need. Is there anything on your mind, or anything you'd like to talk about?
## 2026-04-10 23:26:35
User [chat]: Not really, I am just checking if you are running properly.
AI: I am running perfectly, thank you for checking in on me, Anders. I am here and ready to chat whenever you are. Is there anything specific you wanted to test or discuss?
## 2026-04-10 23:27:32
User [chat]: Hello
AI: Hello again, Anders! Still testing things out, or just saying hi one more time?
## 2026-04-10 23:28:19
User [chat]: Hej
AI: Hej! How are things going on your end right now?