Fix CI, add qemu debug

.github/workflows/c-cpp.yml

@@ -14,6 +14,6 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: configure
-      run: sudo apt install gcc build-essential grub2-common qemu-system-x86
+      run: sudo apt install gcc build-essential grub2-common qemu-system-x86 xorriso mtools
     - name: make
       run: make

.gitignore

@@ -52,3 +52,4 @@ Mkfile.old
 dkms.conf
 *.iso
 /isodir
+serial.log

Makefile

@@ -28,4 +28,4 @@ clean:
 	find kernel/ -name "*.o" -delete
 
 run:
-	qemu-system-x86_64 -m 256 -cdrom cis-os.iso
+	qemu-system-x86_64 -m 256 -cdrom cis-os.iso -d guest_errors -serial file:serial.log

README.md

@@ -1,12 +1,14 @@
 # kernel
 
+[![C/C++ CI](https://github.com/CIS-osdev/kernel/actions/workflows/c-cpp.yml/badge.svg?branch=master)](https://github.com/CIS-osdev/kernel/actions/workflows/c-cpp.yml)
+
 Это проект анархичной операционной системы
 
 ## Сборка и запуск
 
 1. Установите необходимые инструменты:
 ```bash
-sudo apt install gcc build-essential grub2-common qemu
+sudo apt install gcc build-essential grub2-common qemu-system-x86 xorriso mtools
 ```
 
 2. Соберите проект:

kernel/kernel.c

@@ -1,5 +1,13 @@
 #include <kstdint.h>
 
+static inline void outb(uint16_t port, uint8_t val) {
+	asm volatile("outb %0, %1" : : "a"(val), "Nd"(port));
+}
+
+void hal_write_byte_manual(uint8_t byte) {
+	outb(0x3f8, byte);
+}
+
 void puts(char *str) {
     char *video_memory = (char *)0xB8000;
     uint16_t *v = (uint16_t *)video_memory;
@@ -11,6 +19,7 @@ void puts(char *str) {
 }
 
 void kernel_main64() {
+    hal_write_byte_manual('C');
     puts("Hello, World from CIS! ");
-    while(1);
+    for(;;) {}
 }