Implement power-efficient sleep after boot-up
* arch-based crates, inspired by Redox * Do not burn cpu uselessly. * Start using cortex-a registers. * Important: initialise stack pointer!
This commit is contained in:
Berkus Decker
parent
8bacc7cfb7
commit
57e4b81e1c
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@ -26,6 +26,14 @@ dependencies = [
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"rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "cortex-a"
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version = "3.0.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"register 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "nodrop"
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version = "0.1.14"
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@ -44,6 +52,14 @@ name = "r0"
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version = "0.2.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "register"
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version = "0.5.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"tock-registers 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
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]
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[[package]]
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name = "rlibc"
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version = "1.0.0"
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@ -70,6 +86,11 @@ name = "semver-parser"
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version = "0.7.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "tock-registers"
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version = "0.5.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "ux"
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version = "0.1.3"
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@ -79,6 +100,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "vesper"
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version = "0.0.1"
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dependencies = [
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"cortex-a 3.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
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"qemu-exit 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"r0 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
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"rlibc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
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@ -101,12 +123,15 @@ dependencies = [
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"checksum bit_field 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ed8765909f9009617974ab6b7d332625b320b33c326b1e9321382ef1999b5d56"
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"checksum bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
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"checksum cast 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "4b9434b9a5aa1450faa3f9cb14ea0e8c53bb5d2b3c1bfd1ab4fc03e9f33fbfb0"
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"checksum cortex-a 3.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "6922a40af4d1a2deac8c963b9f3e57311b8912490740234f1ad182425c547f80"
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"checksum nodrop 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)" = "72ef4a56884ca558e5ddb05a1d1e7e1bfd9a68d9ed024c21704cc98872dae1bb"
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"checksum qemu-exit 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "95533662c327a4b3be4203123662b7eca1c39d73d66020c52280e4ff0e9c9a41"
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"checksum r0 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e2a38df5b15c8d5c7e8654189744d8e396bddc18ad48041a500ce52d6948941f"
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"checksum register 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "deaba5b0e477d21f61a57504bb5cef4a1e86de30300b457d38971c1cfc98b815"
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"checksum rlibc 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc874b127765f014d792f16763a81245ab80500e2ad921ed4ee9e82481ee08fe"
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"checksum rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
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"checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
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"checksum semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
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"checksum tock-registers 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "70323afdb8082186c0986da0e10f6e4ed103d681c921c00597e98d9806dac20f"
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"checksum ux 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "88dfeb711b61ce620c0cb6fd9f8e3e678622f0c971da2a63c4b3e25e88ed012f"
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"checksum x86_64 0.7.7 (registry+https://github.com/rust-lang/crates.io-index)" = "1f27d9168654aee1b0c1b73746caeb4aa33248f8b8c8f6e100e697fcc2a794b2"
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@ -4,7 +4,7 @@
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* Original code distributed under MIT, additional changes are under BlueOak-1.0.0
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*/
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ENTRY(_boot_cores);
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ENTRY(karch_start);
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/* Symbols between __boot_start and __boot_end should be dropped after init is complete.
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Symbols between __ro_start and __ro_end are the kernel code.
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@ -23,3 +23,4 @@ qemu = ["qemu-exit"]
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r0 = "0.2"
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rlibc = "1.0"
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qemu-exit = { version = "0.1", optional = true }
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cortex-a = "3.0"
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@ -0,0 +1,5 @@
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# Architecture-specific code
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This directory contains code specific to a certain architecture.
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Implementations of arch-specific kernel calls are also placed here.
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@ -0,0 +1,36 @@
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use {
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crate::kmain,
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cortex_a::{
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asm,
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regs::{RegisterReadOnly, RegisterReadWrite, MPIDR_EL1, SP},
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},
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};
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/// The entry to Rust, all things must be initialized
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/// This is invoked from the linker script, does arch-specific init
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/// and passes control to the kernel boot function kmain().
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#[no_mangle]
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pub unsafe extern "C" fn karch_start() -> ! {
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// Set sp to 0x80000 (just before kernel start)
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const STACK_START: u64 = 0x8_0000;
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SP.set(STACK_START);
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match read_cpu_id() {
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0 => kmain(),
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_ => endless_sleep(), // if not core0, indefinitely wait for events
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}
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}
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#[inline]
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pub fn read_cpu_id() -> u64 {
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const CORE_MASK: u64 = 0x3;
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MPIDR_EL1.get() & CORE_MASK
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}
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#[inline]
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pub fn endless_sleep() -> ! {
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loop {
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asm::wfe();
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}
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}
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@ -0,0 +1,5 @@
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#[cfg(target_arch = "aarch64")]
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#[macro_use]
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pub mod aarch64;
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#[cfg(target_arch = "aarch64")]
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pub use self::aarch64::*;
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@ -1,12 +1,20 @@
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#![no_std]
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#![no_main]
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#[no_mangle]
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pub extern "C" fn _boot_cores() -> ! {
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loop {}
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#[cfg(not(target_arch = "aarch64"))]
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use architecture_not_supported_sorry;
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#[macro_use]
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pub mod arch;
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pub use arch::*;
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// Kernel entry point
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// arch crate is responsible for calling this
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pub fn kmain() -> ! {
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endless_sleep()
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}
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#[panic_handler]
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fn panicked(_info: &core::panic::PanicInfo) -> ! {
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loop {}
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endless_sleep()
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}
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