roska/kernel
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Basic serial driver

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This commit is contained in:
Lauren Toivanen 2023-06-15 03:06:27 +03:00
parent e9fd2e98bf
commit c33a57fa33
Signed by: jt
GPG key ID: 9151B109B73ECAD5
4 changed files with 91 additions and 12 deletions
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39
kernel.c
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@ -1,9 +1,15 @@
#include "multiboot.h"
#include "vga.h"
#include "serial.h"
static inline void outb(unsigned short port, unsigned char val) {
asm volatile ("outb %0, %1" : : "a"(val), "Nd"(port) : "memory");
}
static inline unsigned char inb(unsigned short port) {
unsigned char ret;
asm volatile("inb %1, %0" : "=a"(ret) : "Nd"(port) : "memory");
return ret;
}
char* itoa(int value, int base) {
char* result;
@ -41,6 +47,14 @@ void kmain (unsigned int mbootmagick, multiboot_info_t* mbootinfo) {
vga_init(VGA_COLOR_BLACK, VGA_COLOR_GRAY);
vga_write_line("=== KoalemOS ===");
if (serial_init() > 0) {
vga_write_line_color("Serial initialization failed", VGA_COLOR_BLACK,
VGA_COLOR_ORANGE);
} else {
vga_write_line("\nInitialized serial.");
serial_write_string("\n=== KoalemOS ===\n");
}
vga_write("Checking multiboot loader: ");
// Check multiboot header
@ -56,23 +70,30 @@ void kmain (unsigned int mbootmagick, multiboot_info_t* mbootinfo) {
vga_write("\nMultiboot flags: ");
vga_write(itoa(mbootinfo->flags, 2));
// Check videomode
vga_write("\nVideomode: ");
serial_write_string("\nMultiboot flags: ");
serial_write_string(itoa(mbootinfo->flags, 2));
// Check videomode
if (mbootinfo->flags & MULTIBOOT_INFO_VBE_INFO) {
vga_write("VBE 0x");
vga_write("\nVBE Mode: 0x");
vga_write(itoa(mbootinfo->vbe_mode, 16));
} else if (mbootinfo->flags & MULTIBOOT_INFO_FRAMEBUFFER_INFO) {
vga_write("Framebuffer");
vga_write("\nVideo address: 0x");
serial_write_string("\nVBE Mode: 0x");
serial_write_string(itoa(mbootinfo->vbe_mode, 16));
}
if (mbootinfo->flags & MULTIBOOT_INFO_FRAMEBUFFER_INFO) {
vga_write("\nFramebuffer: ");
vga_write("address: 0x");
vga_write(itoa(mbootinfo->framebuffer_addr, 16));
unsigned long long *vmem = &mbootinfo->framebuffer_addr;
serial_write_string("\nFramebuffer: ");
serial_write_string("address: 0x");
serial_write_string(itoa(mbootinfo->framebuffer_addr, 16));
unsigned long *vmem = &mbootinfo->framebuffer_addr;
*vmem = 0xff00ff;
} else {
vga_write_color("Not available", VGA_COLOR_BLACK, VGA_COLOR_RED);
vga_write_color("Info not available", VGA_COLOR_BLACK, VGA_COLOR_RED);
serial_write_string("Info not available");
return;
}
vga_write_line("\nExecution finished, halting...");
}