| /* |
| * Copyright (c) 2014 Travis Geiselbrecht |
| * |
| * 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. |
| */ |
| |
| #include <kernel/mp.h> |
| |
| #include <stdlib.h> |
| #include <debug.h> |
| #include <assert.h> |
| #include <trace.h> |
| #include <arch/mp.h> |
| #include <kernel/spinlock.h> |
| |
| #define LOCAL_TRACE 0 |
| |
| #if WITH_SMP |
| /* a global state structure, aligned on cpu cache line to minimize aliasing */ |
| struct mp_state mp __CPU_ALIGN; |
| |
| void mp_init(void) |
| { |
| } |
| |
| void mp_reschedule(mp_cpu_mask_t target, uint flags) |
| { |
| uint local_cpu = arch_curr_cpu_num(); |
| |
| LTRACEF("local %d, target 0x%x\n", local_cpu, target); |
| |
| /* mask out cpus that are not active and the local cpu */ |
| target &= mp.active_cpus; |
| |
| /* mask out cpus that are currently running realtime code */ |
| if ((flags & MP_RESCHEDULE_FLAG_REALTIME) == 0) { |
| target &= ~mp.realtime_cpus; |
| } |
| target &= ~(1U << local_cpu); |
| |
| LTRACEF("local %d, post mask target now 0x%x\n", local_cpu, target); |
| |
| arch_mp_send_ipi(target, MP_IPI_RESCHEDULE); |
| } |
| |
| void mp_set_curr_cpu_active(bool active) |
| { |
| atomic_or((volatile int *)&mp.active_cpus, 1U << arch_curr_cpu_num()); |
| } |
| |
| enum handler_return mp_mbx_reschedule_irq(void) |
| { |
| uint cpu = arch_curr_cpu_num(); |
| |
| LTRACEF("cpu %u\n", cpu); |
| |
| THREAD_STATS_INC(reschedule_ipis); |
| |
| return (mp.active_cpus & (1U << cpu)) ? INT_RESCHEDULE : INT_NO_RESCHEDULE; |
| } |
| #endif |