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use crate::{error::Error, memory::MemoryCaching};
#[repr(i32)]
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum AccessMode {
KernelMode = windows_kernel_sys::base::_MODE::KernelMode,
UserMode = windows_kernel_sys::base::_MODE::UserMode,
}
pub struct MemoryDescriptorList {
raw: *mut windows_kernel_sys::base::MDL,
}
unsafe impl Send for MemoryDescriptorList {}
unsafe impl Sync for MemoryDescriptorList {}
impl MemoryDescriptorList {
/// # Safety
/// `unsafe`
pub unsafe fn new(addr: *mut core::ffi::c_void, size: usize) -> Result<Self, Error> {
use windows_kernel_sys::ntoskrnl::IoAllocateMdl;
let raw = IoAllocateMdl(
addr,
size as _,
false as _,
false as _,
core::ptr::null_mut(),
);
if raw.is_null() {
return Err(Error::INSUFFICIENT_RESOURCES);
}
Ok(Self {
raw,
})
}
pub fn build_for_non_paged_pool(&mut self) {
use windows_kernel_sys::ntoskrnl::MmBuildMdlForNonPagedPool;
unsafe {
MmBuildMdlForNonPagedPool(self.raw);
}
}
pub fn map_locked_pages(
self,
access: AccessMode,
caching: MemoryCaching,
desired_addr: Option<*mut core::ffi::c_void>,
) -> Result<LockedMapping, Error> {
use windows_kernel_sys::ntoskrnl::MmMapLockedPagesSpecifyCache;
let ptr = unsafe {
MmMapLockedPagesSpecifyCache(
self.raw,
access as _,
caching as _,
desired_addr.unwrap_or(core::ptr::null_mut()),
false as _,
0,
)
};
Ok(LockedMapping {
raw: self.raw,
ptr,
})
}
}
impl Drop for MemoryDescriptorList {
fn drop(&mut self) {
use windows_kernel_sys::ntoskrnl::IoFreeMdl;
unsafe {
IoFreeMdl(self.raw);
}
}
}
pub struct LockedMapping {
raw: *mut windows_kernel_sys::base::MDL,
ptr: *mut core::ffi::c_void,
}
unsafe impl Send for LockedMapping {}
unsafe impl Sync for LockedMapping {}
impl LockedMapping {
pub fn ptr(&self) -> *mut core::ffi::c_void { self.ptr }
pub fn unlock(self) -> MemoryDescriptorList {
use windows_kernel_sys::ntoskrnl::MmUnmapLockedPages;
unsafe {
MmUnmapLockedPages(self.ptr, self.raw);
}
MemoryDescriptorList {
raw: self.raw
}
}
}
impl Drop for LockedMapping {
fn drop(&mut self) {
use windows_kernel_sys::ntoskrnl::{IoFreeMdl, MmUnmapLockedPages};
unsafe {
MmUnmapLockedPages(self.ptr, self.raw);
IoFreeMdl(self.raw);
}
}
}
|