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author | Valentin Popov <valentin@popov.link> | 2024-07-19 15:37:58 +0300 |
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committer | Valentin Popov <valentin@popov.link> | 2024-07-19 15:37:58 +0300 |
commit | a990de90fe41456a23e58bd087d2f107d321f3a1 (patch) | |
tree | 15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/portable-atomic/src/imp/interrupt/xtensa.rs | |
parent | 3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff) | |
download | fparkan-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.rs | 47 |
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 deleted file mode 100644 index bc6d117..0000000 --- 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), - ); - } -} |