#ifndef ucoo_arch_arch_common_arm_hh #define ucoo_arch_arch_common_arm_hh // ucoolib - Microcontroller object oriented library. {{{ // // Copyright (C) 2013 Nicolas Schodet // // Permission is hereby granted, free of charge, to any person obtaining a // copy of this software and associated documentation files (the "Software"), // to deal in the Software without restriction, including without limitation // the rights to use, copy, modify, merge, publish, distribute, sublicense, // and/or sell copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER // DEALINGS IN THE SOFTWARE. // // }}} namespace ucoo { /// Type used to save irq state. typedef unsigned int irq_flags_t; /// Lock interrupts and return previous state. static inline irq_flags_t irq_lock (void) { irq_flags_t flags; __asm__ __volatile__ ("mrs %0, PRIMASK\n\t" "cpsid i" : "=r" (flags) : : "memory", "cc"); return flags; } /// Restore interrupts lock state after an irq_lock. static inline void irq_restore (irq_flags_t flags) { __asm__ __volatile__ ("msr PRIMASK, %0" : : "r" (flags) : "memory", "cc"); } inline void yield () { // Nothing, the CPU is ours! } } // namespace ucoo #endif // ucoo_arch_arch_common_arm_hh