b8caf749bf
* Minor cleanup. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25604 a95241bf-73f2-0310-859d-f6bbb57e9c96
152 lines
2.6 KiB
C
152 lines
2.6 KiB
C
/*
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* Copyright 2002-2008, Axel Dörfler, axeld@pinc-software.de.
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* Distributed under the terms of the MIT License.
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*
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* Copyright 2002, Travis Geiselbrecht. All rights reserved.
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* Distributed under the terms of the NewOS License.
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*/
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/* This file contains the cpu functions (init, etc). */
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#include <cpu.h>
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#include <thread_types.h>
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#include <arch/cpu.h>
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#include <boot/kernel_args.h>
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#include <string.h>
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/* global per-cpu structure */
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cpu_ent gCPU[MAX_BOOT_CPUS];
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static spinlock sSetCpuLock;
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status_t
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cpu_init(kernel_args *args)
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{
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return arch_cpu_init(args);
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}
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status_t
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cpu_init_percpu(kernel_args *args, int curr_cpu)
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{
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return arch_cpu_init_percpu(args, curr_cpu);
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}
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status_t
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cpu_init_post_vm(kernel_args *args)
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{
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return arch_cpu_init_post_vm(args);
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}
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status_t
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cpu_init_post_modules(kernel_args *args)
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{
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return arch_cpu_init_post_modules(args);
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}
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status_t
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cpu_preboot_init_percpu(kernel_args *args, int curr_cpu)
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{
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// set the cpu number in the local cpu structure so that
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// we can use it for get_current_cpu
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memset(&gCPU[curr_cpu], 0, sizeof(gCPU[curr_cpu]));
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gCPU[curr_cpu].cpu_num = curr_cpu;
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return arch_cpu_preboot_init_percpu(args, curr_cpu);
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}
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bigtime_t
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cpu_get_active_time(int32 cpu)
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{
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bigtime_t activeTime;
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cpu_status state;
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if (cpu < 0 || cpu > smp_get_num_cpus())
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return 0;
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// We need to grab the thread lock here, because the thread activity
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// time is not maintained atomically (because there is no need to)
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state = disable_interrupts();
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GRAB_THREAD_LOCK();
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activeTime = gCPU[cpu].active_time;
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RELEASE_THREAD_LOCK();
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restore_interrupts(state);
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return activeTime;
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}
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void
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clear_caches(void *address, size_t length, uint32 flags)
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{
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// ToDo: implement me!
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}
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// #pragma mark -
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void
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_user_clear_caches(void *address, size_t length, uint32 flags)
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{
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clear_caches(address, length, flags);
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}
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bool
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_user_cpu_enabled(int32 cpu)
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{
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if (cpu < 0 || cpu >= smp_get_num_cpus())
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return false;
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return !gCPU[cpu].disabled;
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}
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status_t
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_user_set_cpu_enabled(int32 cpu, bool enabled)
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{
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status_t status = B_OK;
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cpu_status state;
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int32 i, count;
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if (cpu < 0 || cpu >= smp_get_num_cpus())
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return B_BAD_VALUE;
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// We need to lock here to make sure that no one can disable
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// the last CPU
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state = disable_interrupts();
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acquire_spinlock(&sSetCpuLock);
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if (!enabled) {
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// check if this is the last CPU to be disabled
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for (i = 0, count = 0; i < smp_get_num_cpus(); i++) {
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if (!gCPU[i].disabled)
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count++;
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}
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if (count == 1)
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status = B_NOT_ALLOWED;
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}
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if (status == B_OK)
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gCPU[cpu].disabled = !enabled;
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release_spinlock(&sSetCpuLock);
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restore_interrupts(state);
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return status;
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}
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