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Remove interrupt setup from asm bootloader, add io module, memcpy functions, and serial driver

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This commit is contained in:
Jeremy Soller 2016-08-14 09:31:35 -06:00
commit 42c9ba12dc
17 changed files with 422 additions and 264 deletions
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58
src/arch/x86_64/main.rs
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@ -3,27 +3,69 @@
/// It must create the IDT with the correct entries, those entries are
/// defined in other files inside of the `arch` module
use super::idt::{IDTR, IDT};
use super::idt::{IDTR, IDT, IDT_PRESENT, IDT_RING_0, IDT_INTERRUPT};
use super::mem::memset;
extern {
/// The starting byte of the text (code) data segment.
static mut __text_start: u8;
/// The ending byte of the text (code) data segment.
static mut __text_end: u8;
/// The starting byte of the _.rodata_ (read-only data) segment.
static mut __rodata_start: u8;
/// The ending byte of the _.rodata_ (read-only data) segment.
static mut __rodata_end: u8;
/// The starting byte of the _.data_ segment.
static mut __data_start: u8;
/// The ending byte of the _.data_ segment.
static mut __data_end: u8;
/// The starting byte of the _.bss_ (uninitialized data) segment.
static mut __bss_start: u8;
/// The ending byte of the _.bss_ (uninitialized data) segment.
static mut __bss_end: u8;
}
/// Test of zero values in BSS.
static BSS_TEST_ZERO: usize = 0;
/// Test of non-zero values in BSS.
static BSS_TEST_NONZERO: usize = 0xFFFFFFFFFFFFFFFF;
#[naked]
#[no_mangle]
pub unsafe extern "C" fn kmain() {
asm!("xchg bx, bx" : : : : "intel", "volatile");
// Zero BSS, this initializes statics that are set to 0
{
let start_ptr = &mut __bss_start as *mut u8;
let end_ptr = & __bss_end as *const u8 as usize;
if start_ptr as usize <= end_ptr {
let size = end_ptr - start_ptr as usize;
memset(start_ptr, 0, size);
}
//debug_assert_eq!(BSS_TEST_ZERO, 0);
//debug_assert_eq!(BSS_TEST_NONZERO, 0xFFFFFFFFFFFFFFFF);
}
asm!("xchg bx, bx" : : : : "intel", "volatile");
//Set up IDT
for entry in IDT.iter_mut() {
entry.attribute = 1 << 7 | 0xE;
entry.selector = 8;
entry.set_offset(blank as usize);
entry.zero = 0;
entry.zero2 = 0;
entry.set_flags(IDT_PRESENT | IDT_RING_0 | IDT_INTERRUPT);
entry.set_offset(8, blank as usize);
}
IDTR.set_slice(&IDT);
asm!("lidt [rax]" : : "{rax}"(&IDTR as *const _ as usize) : : "intel", "volatile");
IDTR.load();
asm!("xchg bx, bx" : : : : "intel", "volatile");
asm!("int 0xFF" : : : : "intel", "volatile");
asm!("xchg bx, bx" : : : : "intel", "volatile");
print!("TEST\n");
loop{
asm!("hlt" : : : : "intel", "volatile");
}