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Set up enough to mount initrd as the root

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This commit is contained in:
pjht 2024-06-09 18:39:09 -05:00
parent 6f0094c039
commit 1facd5558c
Signed by: pjht
GPG Key ID: 7B5F6AFBEC7EE78E
3 changed files with 279 additions and 5 deletions
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245
Cargo.lock generated
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@ -2,6 +2,12 @@
# It is not intended for manual editing.
version = 3
[[package]]
name = "arrayvec"
version = "0.5.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "autocfg"
version = "1.3.0"
@ -14,11 +20,50 @@ version = "2.5.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "cf4b9d6a944f767f8e5e0db018570623c85f3d925ac718db4e06d0187adb21c1"
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[[package]]
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checksum = "cf31ab66ed8145a1c7427bd8e9b42a6131bd74ccf444f69b9e620c2e73ded832"
dependencies = [
"arrayvec",
]
[[package]]
name = "init"
version = "0.1.0"
dependencies = [
"hexdump",
"tar-no-std",
"vfs_rpc",
]
[[package]]
name = "libc"
version = "0.2.155"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "97b3888a4aecf77e811145cadf6eef5901f4782c53886191b2f693f24761847c"
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checksum = "07af8b9cdd281b7915f413fa73f29ebd5d55d0d3f0155584dade1ff18cea1b17"
dependencies = [
"autocfg",
"scopeguard",
]
[[package]]
@ -42,6 +87,127 @@ dependencies = [
"autocfg",
]
[[package]]
name = "parking_lot"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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]
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
"cfg-if",
"libc",
"redox_syscall",
"smallvec",
"windows-targets",
]
[[package]]
name = "paste"
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dependencies = [
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[[package]]
name = "rmp"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "rmp-serde"
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name = "serde_derive"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -53,3 +219,82 @@ dependencies = [
"memchr",
"num-traits",
]
[[package]]
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"windows_aarch64_msvc",
"windows_i686_gnu",
"windows_i686_gnullvm",
"windows_i686_msvc",
"windows_x86_64_gnu",
"windows_x86_64_gnullvm",
"windows_x86_64_msvc",
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2
Cargo.toml
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@ -6,7 +6,9 @@ edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
hexdump = "0.1.2"
tar-no-std = "0.3.1"
vfs_rpc = { version = "0.1.0", path = "../vfs/vfs_rpc" }
[profile.dev]
panic = "abort"

37
src/main.rs
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@ -3,16 +3,43 @@
use std::os::mikros::loader::Loader;
use std::os::mikros::syscalls::{get_initrd, new_process};
use std::path::Path;
use tar_no_std::TarArchiveRef;
fn main() {
let initrd = TarArchiveRef::new(get_initrd()).unwrap();
let vfs =
let vfs_pid = run_initrd_proc(&initrd, "bin/vfs");
println!("[INIT] Started the VFS");
run_initrd_proc(&initrd, "bin/devfs");
println!("[INIT] Started the devfs");
run_initrd_proc(&initrd, "bin/tarfs");
println!("[INIT] Started the tar FS driver");
run_initrd_proc(&initrd, "bin/initrd_driver");
println!("[INIT] Started the initrd pseudodevice driver");
let vfs_client = vfs_rpc::Client::new(vfs_pid);
loop {
if vfs_client.mount(Path::new("/dummy"), "devfs", Path::new("/dev")).is_ok() {
break;
}
}
println!("[INIT] Mounted /dev");
loop {
if vfs_client.mount(Path::new("/dev/initrd"), "tarfs", Path::new("/")).is_ok() {
break;
}
}
println!("[INIT] Mounted initrd as root");
println!("/test_file.txt:");
print!("{}", std::fs::read_to_string("/test_file.txt").unwrap())
}
fn run_initrd_proc(initrd: &TarArchiveRef, path: &str) -> u64 {
let proc =
initrd
.entries()
.find(|entry| entry.filename().as_str().unwrap() == "bin/vfs")
.expect("vfs not found")
.find(|entry| entry.filename().as_str().unwrap() == path)
.expect(&format!("{} not found", path))
.data();
let (space, entry) = Loader::load(&vfs);
new_process(entry as _, space).unwrap();
let (space, entry) = Loader::load(&proc);
new_process(entry as _, space).unwrap()
}