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| Rev | Author | Line No. | Line |
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| 22 | jermar | 1 | /* |
| 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 | |||
| 29 | #include <proc/scheduler.h> |
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| 30 | #include <cpu.h> |
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| 1187 | jermar | 31 | #include <proc/task.h> |
| 22 | jermar | 32 | #include <proc/thread.h> |
| 33 | #include <arch.h> |
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| 184 | jermar | 34 | #include <arch/context.h> /* SP_DELTA */ |
| 1074 | palkovsky | 35 | #include <arch/debugger.h> |
| 1112 | palkovsky | 36 | #include <arch/pm.h> |
| 1187 | jermar | 37 | #include <arch/asm.h> |
| 22 | jermar | 38 | |
| 1190 | jermar | 39 | /** Perform ia32 specific tasks needed before the new task is run. |
| 1187 | jermar | 40 | * |
| 1190 | jermar | 41 | * Interrupts are disabled. |
| 1187 | jermar | 42 | */ |
| 1190 | jermar | 43 | void before_task_runs_arch(void) |
| 22 | jermar | 44 | { |
| 1187 | jermar | 45 | size_t iomap_size; |
| 46 | ptr_16_32_t cpugdtr; |
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| 47 | descriptor_t *gdt_p; |
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| 48 | |||
| 49 | /* |
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| 50 | * Switch the I/O Permission Bitmap, if necessary. |
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| 51 | */ |
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| 1190 | jermar | 52 | |
| 53 | /* First, copy the I/O Permission Bitmap. */ |
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| 1187 | jermar | 54 | spinlock_lock(&TASK->lock); |
| 55 | iomap_size = TASK->arch.iomap_size; |
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| 56 | if (iomap_size) { |
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| 57 | ASSERT(TASK->arch.iomap); |
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| 58 | memcpy(CPU->arch.tss->iomap, TASK->arch.iomap, iomap_size); |
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| 59 | CPU->arch.tss->iomap[iomap_size] = 0xff; /* terminating byte */ |
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| 60 | } |
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| 61 | spinlock_unlock(&TASK->lock); |
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| 62 | |||
| 63 | /* Second, adjust TSS segment limit. */ |
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| 64 | gdtr_store(&cpugdtr); |
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| 65 | gdt_p = (descriptor_t *) cpugdtr.base; |
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| 66 | gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + iomap_size - 1); |
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| 67 | gdtr_load(&cpugdtr); |
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| 1190 | jermar | 68 | } |
| 1187 | jermar | 69 | |
| 1190 | jermar | 70 | /** Perform ia32 specific tasks needed before the new thread is scheduled. |
| 71 | * |
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| 72 | * THREAD is locked and interrupts are disabled. |
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| 73 | */ |
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| 74 | void before_thread_runs_arch(void) |
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| 75 | { |
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| 76 | CPU->arch.tss->esp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
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| 77 | CPU->arch.tss->ss0 = selector(KDATA_DES); |
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| 78 | |||
| 79 | /* Set up TLS in GS register */ |
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| 80 | set_tls_desc(THREAD->arch.tls); |
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| 81 | |||
| 1074 | palkovsky | 82 | #ifdef CONFIG_DEBUG_AS_WATCHPOINT |
| 83 | /* Set watchpoint on AS to ensure that nobody sets it to zero */ |
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| 1077 | palkovsky | 84 | if (CPU->id < BKPOINTS_MAX) |
| 85 | breakpoint_add(&((the_t *) THREAD->kstack)->as, |
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| 86 | BKPOINT_WRITE | BKPOINT_CHECK_ZERO, |
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| 87 | CPU->id); |
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| 1074 | palkovsky | 88 | #endif |
| 22 | jermar | 89 | } |
| 897 | jermar | 90 | |
| 91 | void after_thread_ran_arch(void) |
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| 92 | { |
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| 93 | } |