From 93a0bc5b7f6ca676fcae10df0a172bcbaca24c2f Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Thu, 20 Nov 2025 18:39:25 -0500 Subject: kern: Introduce high-level spinlock interface Signed-off-by: Ian Moffett --- sys/inc/kern/spinlock.h | 69 +++++++++++++++++++++++++++++++++++++++++++ sys/kern/kern_spinlock.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 146 insertions(+) create mode 100644 sys/inc/kern/spinlock.h create mode 100644 sys/kern/kern_spinlock.c diff --git a/sys/inc/kern/spinlock.h b/sys/inc/kern/spinlock.h new file mode 100644 index 0000000..76a2c3f --- /dev/null +++ b/sys/inc/kern/spinlock.h @@ -0,0 +1,69 @@ +/* + * Copyright (c) 2025 Ian Marco Moffett and the Osmora Team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Hyra nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _KERN_SPINLOCK_H_ +#define _KERN_SPINLOCK_H_ 1 + +#include +#include + +#define SPINLOCK_NAMELEN 32 + +struct spinlock { + char name[SPINLOCK_NAMELEN]; + volatile size_t lock; +}; + +/* + * Initialize a named spinlock + * + * @name: Spinlock name + * @lock: Lock to initialize + * + * Returns zero on success + */ +int spinlock_init(const char *name, struct spinlock *lock); + +/* + * Acquire a spinlock + * + * @lock: Lock to acquire + * @irqclr: Mask interrupts + */ +void spinlock_acquire(struct spinlock *lock, bool irqclr); + +/* + * Release a spinlock + * + * @lock: Lock to release + * @irqset: Unmask interrupts + */ +void spinlock_release(struct spinlock *lock, bool irqset); + +#endif /* !_KERN_SPINLOCK_H_ */ diff --git a/sys/kern/kern_spinlock.c b/sys/kern/kern_spinlock.c new file mode 100644 index 0000000..85dee80 --- /dev/null +++ b/sys/kern/kern_spinlock.c @@ -0,0 +1,77 @@ +/* + * Copyright (c) 2025 Ian Marco Moffett and the Osmora Team. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Hyra nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include +#include +#include +#include + +int +spinlock_init(const char *name, struct spinlock *lock) +{ + size_t name_len; + + if (name == NULL || lock == NULL) { + return -EINVAL; + } + + name_len = strlen(name); + if (name_len >= SPINLOCK_NAMELEN - 1) { + return -ENAMETOOLONG; + } + + memcpy(lock->name, name, name_len); + lock->name[name_len] = '\0'; + lock->lock = 0; + return 0; +} + +void +spinlock_acquire(struct spinlock *lock, bool irqclr) +{ + int flags = 0; + + if (irqclr) { + flags |= SPINLOCK_INTTOG; + } + + mu_spinlock_acq(&lock->lock, flags); +} + +void +spinlock_release(struct spinlock *lock, bool irqset) +{ + int flags = 0; + + if (irqset) { + flags |= SPINLOCK_INTTOG; + } + + mu_spinlock_rel(&lock->lock, flags); +} -- cgit v1.2.3