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const debug = @import("debugcon.zig");
const ALIGN = 1 << 0;
const MEMINFO = 1 << 1;
const MAGIC = 0xE85250D6;
// const FLAGS = ALIGN | MEMINFO;
const FLAGS = 0;
const MultibootHeader = extern struct {
magic: u32,
flags: u32,
len: u32,
checksum: u32,
tag0: u16,
tag1: u16,
tag2: u32,
};
export const multiboot2 align(4) linksection(".multiboot") = MultibootHeader{
.magic = MAGIC,
.flags = FLAGS,
.len = 24,
.checksum = 0x100000000 - (MAGIC + FLAGS + 24),
.tag0 = 0,
.tag1 = 0,
.tag2 = 8,
};
export fn _start() callconv(.Naked) noreturn {
asm volatile (
\\ mov _sstack, %rsp
\\ mov %rsp, %rbp
);
asm volatile ("jmp kmain");
}
var vga = @as([*]volatile u16, @ptrFromInt(0xB8000));
export fn kmain() noreturn {
//print OK
vga[0] = 0x2f4f;
vga[1] = 0x2f4b;
// write debug data
debug.outb(0xe9, 'H');
debug.outb(0xe9, 'i');
debug.outb(0xe9, '!');
debug.outb(0xe9, '\n');
while (true) {}
}
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