/* * Copyright (c) 2005 Jakub Jermar * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - 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. * - The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ /** @addtogroup kernel_ia32_proc * @{ */ /** @file */ #include <proc/scheduler.h> #include <cpu.h> #include <proc/task.h> #include <proc/thread.h> #include <arch.h> #include <arch/interrupt.h> #include <arch/pm.h> #include <arch/asm.h> #include <arch/ddi/ddi.h> /** Perform ia32 specific tasks needed before the new task is run. * * Interrupts are disabled. */ void before_task_runs_arch(void) { io_perm_bitmap_install(); } /** Perform ia32 specific tasks needed before the new thread is scheduled. * * THREAD is locked and interrupts are disabled. */ void before_thread_runs_arch(void) { uintptr_t kstk = (uintptr_t) &THREAD->kstack[STACK_SIZE]; #ifndef PROCESSOR_i486 if (CPU->arch.fi.bits.sep) { /* Set kernel stack for CP3 -> CPL0 switch via SYSENTER */ write_msr(IA32_MSR_SYSENTER_ESP, kstk - sizeof(istate_t)); } #endif /* Set kernel stack for CPL3 -> CPL0 switch via interrupt */ CPU->arch.tss->esp0 = kstk; CPU->arch.tss->ss0 = GDT_SELECTOR(KDATA_DES); } void after_thread_ran_arch(void) { } /** @} */