Ensure that MMIO memory is mapped without caching

ihdad/src/hda/device.rs

@@ -6,7 +6,7 @@ use std::str;
 use std::collections::BTreeMap;
 use std::sync::atomic::{AtomicUsize, Ordering};
 
-use syscall::PHYSMAP_WRITE;
+use syscall::{PHYSMAP_NO_CACHE, PHYSMAP_WRITE};
 use syscall::error::{Error, EACCES, EBADF, Result, EINVAL};
 use syscall::flag::{SEEK_SET, SEEK_CUR, SEEK_END};
 use syscall::io::{Mmio, Io};
@@ -159,7 +159,7 @@ impl IntelHDA {
 		};
 
 		let buff_desc_virt = unsafe {
-			syscall::physmap(buff_desc_phys, 0x1000, PHYSMAP_WRITE)
+			syscall::physmap(buff_desc_phys, 0x1000, PHYSMAP_WRITE | PHYSMAP_NO_CACHE)
 				.expect("ihdad: failed to map address for buffer descriptor list.")
 		};
 
@@ -172,7 +172,7 @@ impl IntelHDA {
 				.expect("Could not allocate physical memory for CORB and RIRB.")
 		};
 
-		let cmd_buff_virt = unsafe { syscall::physmap(cmd_buff_address, 0x1000, PHYSMAP_WRITE).expect("ihdad: failed to map address for CORB/RIRB buff") };
+		let cmd_buff_virt = unsafe { syscall::physmap(cmd_buff_address, 0x1000, PHYSMAP_WRITE | PHYSMAP_NO_CACHE).expect("ihdad: failed to map address for CORB/RIRB buff") };
 
 		print!("Virt: {:016X}, Phys: {:016X}\n", cmd_buff_virt, cmd_buff_address);
 		let mut module = IntelHDA {

ihdad/src/hda/stream.rs

@@ -1,4 +1,4 @@
-use syscall::PHYSMAP_WRITE;
+use syscall::{PHYSMAP_WRITE, PHYSMAP_NO_CACHE};
 use syscall::error::{Error, EIO, Result};
 use syscall::io::{Mmio, Io};
 use std::result;
@@ -301,7 +301,7 @@ impl StreamBuffer {
 		};
 
 		let addr = match unsafe {
-			syscall::physmap(phys, block_length * block_count, PHYSMAP_WRITE)
+			syscall::physmap(phys, block_length * block_count, PHYSMAP_WRITE | PHYSMAP_NO_CACHE)
 		} {
 			Ok(addr) => addr,
 			Err(err) => {