4lDO2
48 lines
1.2 KiB
Rust
48 lines
1.2 KiB
Rust
use alloc::sync::Arc;
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use crate::{
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context,
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paging::VirtualAddress,
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syscall::error::{Error, Result, EFAULT, EPERM, ESRCH},
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};
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fn enforce_root() -> Result<()> {
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let contexts = context::contexts();
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let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
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let context = context_lock.read();
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if context.euid == 0 {
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Ok(())
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} else {
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Err(Error::new(EPERM))
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}
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}
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#[cfg(not(any(target_arch = "x86", target_arch = "x86_64")))]
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pub fn iopl(level: usize) -> Result<usize> {
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Err(Error::new(syscall::error::ENOSYS))
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}
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#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
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pub fn iopl(level: usize) -> Result<usize> {
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enforce_root()?;
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context::current()?.write().set_userspace_io_allowed(level >= 3);
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Ok(0)
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}
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pub fn virttophys(virtual_address: usize) -> Result<usize> {
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enforce_root()?;
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let addr_space = Arc::clone(context::current()?.read().addr_space()?);
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let addr_space = addr_space.acquire_read();
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match addr_space
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.table
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.utable
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.translate(VirtualAddress::new(virtual_address))
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{
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Some((physical_address, _)) => Ok(physical_address.data()),
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None => Err(Error::new(EFAULT)),
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}
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}
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