Rev 1201 | Rev 1255 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 22 | jermar | 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 | #include <proc/scheduler.h> |
||
| 30 | #include <cpu.h> |
||
| 1187 | jermar | 31 | #include <proc/task.h> |
| 22 | jermar | 32 | #include <proc/thread.h> |
| 33 | #include <arch.h> |
||
| 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> |
| 1201 | jermar | 38 | #include <adt/bitmap.h> |
| 1251 | jermar | 39 | #include <print.h> |
| 22 | jermar | 40 | |
| 1190 | jermar | 41 | /** Perform ia32 specific tasks needed before the new task is run. |
| 1187 | jermar | 42 | * |
| 1190 | jermar | 43 | * Interrupts are disabled. |
| 1187 | jermar | 44 | */ |
| 1190 | jermar | 45 | void before_task_runs_arch(void) |
| 22 | jermar | 46 | { |
| 1201 | jermar | 47 | count_t bits; |
| 1187 | jermar | 48 | ptr_16_32_t cpugdtr; |
| 49 | descriptor_t *gdt_p; |
||
| 50 | |||
| 51 | /* |
||
| 52 | * Switch the I/O Permission Bitmap, if necessary. |
||
| 53 | */ |
||
| 1190 | jermar | 54 | |
| 55 | /* First, copy the I/O Permission Bitmap. */ |
||
| 1187 | jermar | 56 | spinlock_lock(&TASK->lock); |
| 1201 | jermar | 57 | if ((bits = TASK->arch.iomap.bits)) { |
| 58 | bitmap_t iomap; |
||
| 1251 | jermar | 59 | |
| 1201 | jermar | 60 | ASSERT(TASK->arch.iomap.map); |
| 61 | bitmap_initialize(&iomap, CPU->arch.tss->iomap, TSS_IOMAP_SIZE * 8); |
||
| 62 | bitmap_copy(&iomap, &TASK->arch.iomap, TASK->arch.iomap.bits); |
||
| 63 | /* |
||
| 64 | * It is safe to set the trailing four bits because of the extra |
||
| 65 | * convenience byte in TSS_IOMAP_SIZE. |
||
| 66 | */ |
||
| 67 | bitmap_set_range(&iomap, TASK->arch.iomap.bits, 4); |
||
| 1187 | jermar | 68 | } |
| 1201 | jermar | 69 | spinlock_unlock(&TASK->lock); |
| 1187 | jermar | 70 | |
| 71 | /* Second, adjust TSS segment limit. */ |
||
| 72 | gdtr_store(&cpugdtr); |
||
| 73 | gdt_p = (descriptor_t *) cpugdtr.base; |
||
| 1201 | jermar | 74 | gdt_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + BITS2BYTES(bits) - 1); |
| 1187 | jermar | 75 | gdtr_load(&cpugdtr); |
| 1190 | jermar | 76 | } |
| 1187 | jermar | 77 | |
| 1190 | jermar | 78 | /** Perform ia32 specific tasks needed before the new thread is scheduled. |
| 79 | * |
||
| 80 | * THREAD is locked and interrupts are disabled. |
||
| 81 | */ |
||
| 82 | void before_thread_runs_arch(void) |
||
| 83 | { |
||
| 84 | CPU->arch.tss->esp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
||
| 85 | CPU->arch.tss->ss0 = selector(KDATA_DES); |
||
| 86 | |||
| 87 | /* Set up TLS in GS register */ |
||
| 88 | set_tls_desc(THREAD->arch.tls); |
||
| 89 | |||
| 1074 | palkovsky | 90 | #ifdef CONFIG_DEBUG_AS_WATCHPOINT |
| 91 | /* Set watchpoint on AS to ensure that nobody sets it to zero */ |
||
| 1077 | palkovsky | 92 | if (CPU->id < BKPOINTS_MAX) |
| 93 | breakpoint_add(&((the_t *) THREAD->kstack)->as, |
||
| 94 | BKPOINT_WRITE | BKPOINT_CHECK_ZERO, |
||
| 95 | CPU->id); |
||
| 1074 | palkovsky | 96 | #endif |
| 22 | jermar | 97 | } |
| 897 | jermar | 98 | |
| 99 | void after_thread_ran_arch(void) |
||
| 100 | { |
||
| 101 | } |