| 1 | /*
|
|---|
| 2 | * Copyright (c) 2005 Jakub Jermar
|
|---|
| 3 | * All rights reserved.
|
|---|
| 4 | *
|
|---|
| 5 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | * modification, are permitted provided that the following conditions
|
|---|
| 7 | * are met:
|
|---|
| 8 | *
|
|---|
| 9 | * - Redistributions of source code must retain the above copyright
|
|---|
| 10 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | * - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 13 | * documentation and/or other materials provided with the distribution.
|
|---|
| 14 | * - The name of the author may not be used to endorse or promote products
|
|---|
| 15 | * derived from this software without specific prior written permission.
|
|---|
| 16 | *
|
|---|
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | /** @addtogroup ia32proc
|
|---|
| 30 | * @{
|
|---|
| 31 | */
|
|---|
| 32 | /** @file
|
|---|
| 33 | */
|
|---|
| 34 |
|
|---|
| 35 | #include <proc/scheduler.h>
|
|---|
| 36 | #include <cpu.h>
|
|---|
| 37 | #include <proc/task.h>
|
|---|
| 38 | #include <proc/thread.h>
|
|---|
| 39 | #include <arch.h>
|
|---|
| 40 | #include <arch/context.h> /* SP_DELTA */
|
|---|
| 41 | #include <arch/debugger.h>
|
|---|
| 42 | #include <arch/pm.h>
|
|---|
| 43 | #include <arch/asm.h>
|
|---|
| 44 | #include <arch/ddi/ddi.h>
|
|---|
| 45 |
|
|---|
| 46 | /** Perform ia32 specific tasks needed before the new task is run.
|
|---|
| 47 | *
|
|---|
| 48 | * Interrupts are disabled.
|
|---|
| 49 | */
|
|---|
| 50 | void before_task_runs_arch(void)
|
|---|
| 51 | {
|
|---|
| 52 | io_perm_bitmap_install();
|
|---|
| 53 | }
|
|---|
| 54 |
|
|---|
| 55 | /** Perform ia32 specific tasks needed before the new thread is scheduled.
|
|---|
| 56 | *
|
|---|
| 57 | * THREAD is locked and interrupts are disabled.
|
|---|
| 58 | */
|
|---|
| 59 | void before_thread_runs_arch(void)
|
|---|
| 60 | {
|
|---|
| 61 | uintptr_t kstk = (uintptr_t) &THREAD->kstack[THREAD_STACK_SIZE -
|
|---|
| 62 | SP_DELTA];
|
|---|
| 63 |
|
|---|
| 64 | /* Set kernel stack for CP3 -> CPL0 switch via SYSENTER */
|
|---|
| 65 | write_msr(IA32_MSR_SYSENTER_ESP, kstk);
|
|---|
| 66 |
|
|---|
| 67 | /* Set kernel stack for CPL3 -> CPL0 switch via interrupt */
|
|---|
| 68 | CPU->arch.tss->esp0 = kstk;
|
|---|
| 69 | CPU->arch.tss->ss0 = selector(KDATA_DES);
|
|---|
| 70 |
|
|---|
| 71 | /* Set up TLS in GS register */
|
|---|
| 72 | set_tls_desc(THREAD->arch.tls);
|
|---|
| 73 |
|
|---|
| 74 | #ifdef CONFIG_DEBUG_AS_WATCHPOINT
|
|---|
| 75 | /* Set watchpoint on AS to ensure that nobody sets it to zero */
|
|---|
| 76 | if (CPU->id < BKPOINTS_MAX) {
|
|---|
| 77 | the_t *the = THE;
|
|---|
| 78 | breakpoint_add(&((the_t *) the->thread->kstack)->as,
|
|---|
| 79 | BKPOINT_WRITE | BKPOINT_CHECK_ZERO, the->cpu->id);
|
|---|
| 80 | }
|
|---|
| 81 | #endif
|
|---|
| 82 | }
|
|---|
| 83 |
|
|---|
| 84 | void after_thread_ran_arch(void)
|
|---|
| 85 | {
|
|---|
| 86 | }
|
|---|
| 87 |
|
|---|
| 88 | /** @}
|
|---|
| 89 | */
|
|---|
