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const console = @import("console.zig");
const ALIGN = 1 << 0;
const MEMINFO = 1 << 1;
const MAGIC = 0x1BADB002;
const FLAGS = ALIGN | MEMINFO;
const MultibootHeader = extern struct {
magic: i32,
flags: i32,
checksum: i32,
};
export const multiboot align(4) linksection(".multiboot") = MultibootHeader{
.magic = MAGIC,
.flags = FLAGS,
.checksum = -(MAGIC + FLAGS),
};
export var stack: [16 * 1024]u8 align(16) linksection(".bss") = undefined;
const stack_bytes_slice = stack[0..];
inline fn inb(port: u16) u8 {
return asm volatile ("inb %[port], %[result]"
: [result] "={al}" (-> u8),
: [port] "N{dx}" (port),
);
}
inline fn outb(port: u16, data: u8) void {
asm volatile ("outb %[data], %[port]"
:
: [data] "{al}" (data),
[port] "N{dx}" (port),
);
}
export fn _start() callconv(.C) noreturn {
outb(0xe9, 'H');
outb(0xe9, 'i');
outb(0xe9, '!');
outb(0xe9, '\n');
asm volatile (
\\ mov %[stk], %rsp
\\ mov %rsp, %rbp
:
: [stk] "{rcx}" (@intFromPtr(&stack) + @sizeOf(@TypeOf(stack))),
);
asm volatile ("call kmain");
while (true) {}
}
export fn kmain() void {
console.initialize();
console.puts("Hello world!");
}
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