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Use multiboot2 to locate RSDT

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This commit is contained in:
WangRunji 2018-06-20 11:08:47 +08:00
parent 0e2cccef9e
commit d2d9affddf
3 changed files with 6 additions and 41 deletions
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38
src/arch/x86_64/driver/acpi/mod.rs
View File

@ -4,19 +4,11 @@ mod structs;
use self::structs::*;
use consts::*;
pub fn init() -> Result<AcpiResult, AcpiError> {
let rsdp = find_rsdp().expect("acpi: rsdp not found.");
if rsdp.rsdt_physical_address > PHYSICAL_MEMORY_LIMIT {
return Err(AcpiError::NotMapped);
}
trace!("RSDT at {:#x}", rsdp.rsdt_physical_address);
let rsdt = unsafe{ &*(rsdp.rsdt_physical_address as *const Rsdt) };
pub fn init(rsdt_addr: usize) -> Result<AcpiResult, AcpiError> {
let rsdt = unsafe { &*(rsdt_addr as *const Rsdt) };
let mut madt: Option<&'static Madt> = None;
for i in 0 .. rsdt.entry_count() {
let entry = rsdt.entry_at(i);
if entry > PHYSICAL_MEMORY_LIMIT {
return Err(AcpiError::NotMapped);
}
let header = unsafe{ &*(entry as *const Header) };
trace!("{:?}", header);
if &header.signature == b"APIC" {
@ -27,11 +19,6 @@ pub fn init() -> Result<AcpiResult, AcpiError> {
config_smp(madt.expect("acpi: madt not found."))
}
#[cfg(target_arch="x86")]
const PHYSICAL_MEMORY_LIMIT: u32 = 0x0E000000;
#[cfg(target_arch="x86_64")]
const PHYSICAL_MEMORY_LIMIT: u32 = 0x80000000;
#[derive(Debug)]
pub struct AcpiResult {
pub cpu_num: u8,
@ -72,24 +59,3 @@ fn config_smp(madt: &'static Madt) -> Result<AcpiResult, AcpiError> {
let ioapic_id = ioapic_id.unwrap();
Ok(AcpiResult { cpu_num, cpu_acpi_ids, ioapic_id, lapic_addr })
}
/// See https://wiki.osdev.org/RSDP -- Detecting the RSDP
fn find_rsdp() -> Option<&'static Rsdp> {
use util::{Checkable, find_in_memory};
let ebda = unsafe { *(0x40E as *const u16) as usize } << 4;
trace!("EBDA at {:#x}", ebda);
macro_rules! return_if_find_in {
($begin:expr, $end:expr) => (
if let Some(addr) = unsafe{ find_in_memory::<Rsdp>($begin, $end, 4) } {
return Some(unsafe{ &*(addr as *const Rsdp) });
}
)
}
if ebda != 0 {
return_if_find_in!(ebda as usize, 1024);
}
return_if_find_in!(0xE0000, 0x20000);
None
}

6
src/arch/x86_64/driver/mod.rs
View File

@ -8,15 +8,13 @@ pub mod keyboard;
pub mod pit;
pub mod ide;
pub fn init(mut page_map: impl FnMut(usize, usize)) -> acpi::AcpiResult {
pub fn init(rsdt_addr: usize, mut page_map: impl FnMut(usize, usize)) -> acpi::AcpiResult {
assert_has_not_been_called!();
page_map(0, 1); // EBDA
page_map(0xe0_000, 0x100 - 0xe0);
page_map(0x07fe1000, 1); // RSDT
page_map(0xfec00000, 1); // IOAPIC
let acpi = acpi::init().expect("Failed to init ACPI");
let acpi = acpi::init(rsdt_addr).expect("Failed to init ACPI");
assert_eq!(acpi.lapic_addr as usize, 0xfee00000);
trace!("acpi = {:?}", acpi);

3
src/lib.rs
View File

@ -73,6 +73,7 @@ pub extern "C" fn rust_main(multiboot_information_address: usize) -> ! {
println!("Hello World{}", "!");
let boot_info = unsafe { multiboot2::load(multiboot_information_address) };
let rsdt_addr = boot_info.rsdp_v1_tag().unwrap().rsdt_address();
// set up guard page and map the heap pages
let mut kernel_memory = memory::init(boot_info);
@ -85,7 +86,7 @@ pub extern "C" fn rust_main(multiboot_information_address: usize) -> ! {
test!(find_mp);
use memory::*;
let acpi = arch::driver::init(|addr: usize, count: usize| {
let acpi = arch::driver::init(rsdt_addr, |addr: usize, count: usize| {
kernel_memory.push(MemoryArea::new_identity(addr, addr + count * 0x1000, MemoryAttr::default(), "acpi"))
});