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| 1 | /* |
1 | /* |
| 2 | * Copyright (C) 2005 Jakub Jermar |
2 | * Copyright (C) 2005 Jakub Jermar |
| 3 | * All rights reserved. |
3 | * All rights reserved. |
| 4 | * |
4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
7 | * are met: |
| 8 | * |
8 | * |
| 9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
| 16 | * |
16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
27 | */ |
| 28 | 28 | ||
| 29 | #include <proc/scheduler.h> |
29 | #include <proc/scheduler.h> |
| 30 | #include <cpu.h> |
30 | #include <cpu.h> |
| - | 31 | #include <proc/task.h> |
|
| 31 | #include <proc/thread.h> |
32 | #include <proc/thread.h> |
| 32 | #include <arch.h> |
33 | #include <arch.h> |
| 33 | #include <arch/context.h> /* SP_DELTA */ |
34 | #include <arch/context.h> /* SP_DELTA */ |
| 34 | #include <arch/debugger.h> |
35 | #include <arch/debugger.h> |
| 35 | #include <arch/pm.h> |
36 | #include <arch/pm.h> |
| - | 37 | #include <arch/asm.h> |
|
| 36 | 38 | ||
| - | 39 | /** Perform ia32 specific tasks needed before the new task is run. */ |
|
| - | 40 | void before_task_runs_arch(void) |
|
| - | 41 | { |
|
| - | 42 | } |
|
| - | 43 | ||
| - | 44 | /** Perform ia32 specific tasks needed before the new thread is scheduled. |
|
| - | 45 | * |
|
| - | 46 | * THREAD is locked and interrupts are disabled. |
|
| - | 47 | */ |
|
| 37 | void before_thread_runs_arch(void) |
48 | void before_thread_runs_arch(void) |
| 38 | { |
49 | { |
| - | 50 | size_t iomap_size; |
|
| - | 51 | ptr_16_32_t cpugdtr; |
|
| - | 52 | descriptor_t *gdt_p; |
|
| - | 53 | ||
| 39 | CPU->arch.tss->esp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
54 | CPU->arch.tss->esp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
| 40 | CPU->arch.tss->ss0 = selector(KDATA_DES); |
55 | CPU->arch.tss->ss0 = selector(KDATA_DES); |
| 41 | 56 | ||
| 42 | /* Set up TLS in GS register */ |
57 | /* Set up TLS in GS register */ |
| 43 | set_tls_desc(THREAD->arch.tls); |
58 | set_tls_desc(THREAD->arch.tls); |
| 44 | 59 | ||
| - | 60 | /* |
|
| - | 61 | * Switch the I/O Permission Bitmap, if necessary. |
|
| - | 62 | * |
|
| - | 63 | * First, copy the I/O Permission Bitmap. |
|
| - | 64 | * This needs to be changed so that the |
|
| - | 65 | * copying is avoided if the same task |
|
| - | 66 | * was already running and the iomap did |
|
| - | 67 | * not change. |
|
| - | 68 | */ |
|
| - | 69 | spinlock_lock(&TASK->lock); |
|
| - | 70 | iomap_size = TASK->arch.iomap_size; |
|
| - | 71 | if (iomap_size) { |
|
| - | 72 | ASSERT(TASK->arch.iomap); |
|
| - | 73 | memcpy(CPU->arch.tss->iomap, TASK->arch.iomap, iomap_size); |
|
| - | 74 | CPU->arch.tss->iomap[iomap_size] = 0xff; /* terminating byte */ |
|
| - | 75 | } |
|
| - | 76 | spinlock_unlock(&TASK->lock); |
|
| - | 77 | ||
| - | 78 | /* Second, adjust TSS segment limit. */ |
|
| - | 79 | gdtr_store(&cpugdtr); |
|
| - | 80 | gdt_p = (descriptor_t *) cpugdtr.base; |
|
| - | 81 | gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + iomap_size - 1); |
|
| - | 82 | gdtr_load(&cpugdtr); |
|
| - | 83 | ||
| 45 | #ifdef CONFIG_DEBUG_AS_WATCHPOINT |
84 | #ifdef CONFIG_DEBUG_AS_WATCHPOINT |
| 46 | /* Set watchpoint on AS to ensure that nobody sets it to zero */ |
85 | /* Set watchpoint on AS to ensure that nobody sets it to zero */ |
| 47 | if (CPU->id < BKPOINTS_MAX) |
86 | if (CPU->id < BKPOINTS_MAX) |
| 48 | breakpoint_add(&((the_t *) THREAD->kstack)->as, |
87 | breakpoint_add(&((the_t *) THREAD->kstack)->as, |
| 49 | BKPOINT_WRITE | BKPOINT_CHECK_ZERO, |
88 | BKPOINT_WRITE | BKPOINT_CHECK_ZERO, |
| 50 | CPU->id); |
89 | CPU->id); |
| 51 | #endif |
90 | #endif |
| 52 | } |
91 | } |
| 53 | 92 | ||
| 54 | void after_thread_ran_arch(void) |
93 | void after_thread_ran_arch(void) |
| 55 | { |
94 | { |
| 56 | } |
95 | } |
| 57 | 96 | ||