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authorValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
committerValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
commita990de90fe41456a23e58bd087d2f107d321f3a1 (patch)
tree15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/portable-atomic/src/imp/interrupt/xtensa.rs
parent3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff)
downloadfparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.tar.xz
fparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.zip
Deleted vendor folder
Diffstat (limited to 'vendor/portable-atomic/src/imp/interrupt/xtensa.rs')
-rw-r--r--vendor/portable-atomic/src/imp/interrupt/xtensa.rs47
1 files changed, 0 insertions, 47 deletions
diff --git a/vendor/portable-atomic/src/imp/interrupt/xtensa.rs b/vendor/portable-atomic/src/imp/interrupt/xtensa.rs
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--- a/vendor/portable-atomic/src/imp/interrupt/xtensa.rs
+++ /dev/null
@@ -1,47 +0,0 @@
-// SPDX-License-Identifier: Apache-2.0 OR MIT
-
-// Refs:
-// - Xtensa Instruction Set Architecture (ISA) Reference Manual https://0x04.net/~mwk/doc/xtensa.pdf
-// - Linux kernel's Xtensa atomic implementation https://github.com/torvalds/linux/blob/v6.1/arch/xtensa/include/asm/atomic.h
-
-use core::arch::asm;
-
-pub(super) use core::sync::atomic;
-
-pub(super) type State = u32;
-
-/// Disables interrupts and returns the previous interrupt state.
-#[inline]
-pub(super) fn disable() -> State {
- let r: State;
- // SAFETY: reading the PS special register and disabling all interrupts is safe.
- // (see module-level comments of interrupt/mod.rs on the safety of using privileged instructions)
- unsafe {
- // Do not use `nomem` and `readonly` because prevent subsequent memory accesses from being reordered before interrupts are disabled.
- // Interrupt level 15 to disable all interrupts.
- // SYNC after RSIL is not required.
- asm!("rsil {0}, 15", out(reg) r, options(nostack));
- }
- r
-}
-
-/// Restores the previous interrupt state.
-///
-/// # Safety
-///
-/// The state must be the one retrieved by the previous `disable`.
-#[inline]
-pub(super) unsafe fn restore(r: State) {
- // SAFETY: the caller must guarantee that the state was retrieved by the previous `disable`,
- // and we've checked that interrupts were enabled before disabling interrupts.
- unsafe {
- // Do not use `nomem` and `readonly` because prevent preceding memory accesses from being reordered after interrupts are enabled.
- // SYNC after WSR is required to guarantee that subsequent RSIL read the written value.
- asm!(
- "wsr.ps {0}",
- "rsync",
- in(reg) r,
- options(nostack),
- );
- }
-}