| 1 | /*
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| 2 | * Copyright (c) 2005 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup ia32proc
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #include <proc/scheduler.h>
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| 36 | #include <cpu.h>
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| 37 | #include <proc/task.h>
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| 38 | #include <proc/thread.h>
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| 39 | #include <arch.h>
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| 40 | #include <arch/interrupt.h>
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| 41 | #include <arch/pm.h>
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| 42 | #include <arch/asm.h>
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| 43 | #include <arch/ddi/ddi.h>
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| 44 |
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| 45 | /** Perform ia32 specific tasks needed before the new task is run.
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| 46 | *
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| 47 | * Interrupts are disabled.
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| 48 | */
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| 49 | void before_task_runs_arch(void)
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| 50 | {
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| 51 | io_perm_bitmap_install();
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| 52 | }
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| 53 |
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| 54 | /** Perform ia32 specific tasks needed before the new thread is scheduled.
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| 55 | *
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| 56 | * THREAD is locked and interrupts are disabled.
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| 57 | */
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| 58 | void before_thread_runs_arch(void)
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| 59 | {
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| 60 | uintptr_t kstk = (uintptr_t) &THREAD->kstack[STACK_SIZE];
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| 61 |
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| 62 | #ifndef PROCESSOR_i486
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| 63 | if (CPU->arch.fi.bits.sep) {
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| 64 | /* Set kernel stack for CP3 -> CPL0 switch via SYSENTER */
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| 65 | write_msr(IA32_MSR_SYSENTER_ESP, kstk - sizeof(istate_t));
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| 66 | }
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| 67 | #endif
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| 68 |
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| 69 | /* Set kernel stack for CPL3 -> CPL0 switch via interrupt */
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| 70 | CPU->arch.tss->esp0 = kstk;
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| 71 | CPU->arch.tss->ss0 = GDT_SELECTOR(KDATA_DES);
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| 72 | }
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| 73 |
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| 74 | void after_thread_ran_arch(void)
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| 75 | {
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| 76 | }
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| 77 |
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| 78 | /** @}
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| 79 | */
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