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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 | |
| 1187 | jermar | 39 | /** Perform ia32 specific tasks needed before the new task is run. */ |
| 40 | void before_task_runs_arch(void) |
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| 41 | { |
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| 42 | } |
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| 43 | |||
| 44 | /** Perform ia32 specific tasks needed before the new thread is scheduled. |
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| 45 | * |
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| 46 | * THREAD is locked and interrupts are disabled. |
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| 47 | */ |
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| 52 | vana | 48 | void before_thread_runs_arch(void) |
| 22 | jermar | 49 | { |
| 1187 | jermar | 50 | size_t iomap_size; |
| 51 | ptr_16_32_t cpugdtr; |
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| 52 | descriptor_t *gdt_p; |
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| 53 | |||
| 184 | jermar | 54 | CPU->arch.tss->esp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
| 167 | jermar | 55 | CPU->arch.tss->ss0 = selector(KDATA_DES); |
| 1074 | palkovsky | 56 | |
| 1112 | palkovsky | 57 | /* Set up TLS in GS register */ |
| 1184 | jermar | 58 | set_tls_desc(THREAD->arch.tls); |
| 1112 | palkovsky | 59 | |
| 1187 | jermar | 60 | /* |
| 61 | * Switch the I/O Permission Bitmap, if necessary. |
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| 62 | * |
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| 63 | * First, copy the I/O Permission Bitmap. |
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| 64 | * This needs to be changed so that the |
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| 65 | * copying is avoided if the same task |
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| 66 | * was already running and the iomap did |
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| 67 | * not change. |
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| 68 | */ |
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| 69 | spinlock_lock(&TASK->lock); |
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| 70 | iomap_size = TASK->arch.iomap_size; |
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| 71 | if (iomap_size) { |
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| 72 | ASSERT(TASK->arch.iomap); |
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| 73 | memcpy(CPU->arch.tss->iomap, TASK->arch.iomap, iomap_size); |
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| 74 | CPU->arch.tss->iomap[iomap_size] = 0xff; /* terminating byte */ |
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| 75 | } |
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| 76 | spinlock_unlock(&TASK->lock); |
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| 77 | |||
| 78 | /* Second, adjust TSS segment limit. */ |
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| 79 | gdtr_store(&cpugdtr); |
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| 80 | gdt_p = (descriptor_t *) cpugdtr.base; |
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| 81 | gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + iomap_size - 1); |
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| 82 | gdtr_load(&cpugdtr); |
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| 83 | |||
| 1074 | palkovsky | 84 | #ifdef CONFIG_DEBUG_AS_WATCHPOINT |
| 85 | /* Set watchpoint on AS to ensure that nobody sets it to zero */ |
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| 1077 | palkovsky | 86 | if (CPU->id < BKPOINTS_MAX) |
| 87 | breakpoint_add(&((the_t *) THREAD->kstack)->as, |
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| 88 | BKPOINT_WRITE | BKPOINT_CHECK_ZERO, |
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| 89 | CPU->id); |
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| 1074 | palkovsky | 90 | #endif |
| 22 | jermar | 91 | } |
| 897 | jermar | 92 | |
| 93 | void after_thread_ran_arch(void) |
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| 94 | { |
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| 95 | } |