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| Rev | Author | Line No. | Line |
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| 257 | palkovsky | 1 | /* |
| 2 | * Copyright (C) 2005 Ondrej Palkovsky |
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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> |
| 257 | palkovsky | 32 | #include <proc/thread.h> |
| 33 | #include <arch.h> |
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| 34 | #include <arch/context.h> /* SP_DELTA */ |
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| 806 | palkovsky | 35 | #include <arch/asm.h> |
| 1072 | palkovsky | 36 | #include <arch/debugger.h> |
| 1104 | jermar | 37 | #include <print.h> |
| 1187 | jermar | 38 | #include <arch/pm.h> |
| 257 | palkovsky | 39 | |
| 1190 | jermar | 40 | /** Perform amd64 specific tasks needed before the new task is run. |
| 41 | * |
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| 42 | * Interrupts are disabled. |
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| 43 | */ |
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| 1187 | jermar | 44 | void before_task_runs_arch(void) |
| 45 | { |
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| 46 | size_t iomap_size; |
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| 47 | ptr_16_64_t cpugdtr; |
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| 48 | descriptor_t *gdt_p; |
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| 49 | |||
| 50 | /* |
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| 51 | * Switch the I/O Permission Bitmap, if necessary. |
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| 52 | */ |
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| 1190 | jermar | 53 | |
| 54 | /* First, copy the I/O Permission Bitmap. */ |
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| 1187 | jermar | 55 | spinlock_lock(&TASK->lock); |
| 56 | iomap_size = TASK->arch.iomap_size; |
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| 57 | if (iomap_size) { |
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| 58 | ASSERT(TASK->arch.iomap); |
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| 59 | memcpy(CPU->arch.tss->iomap, TASK->arch.iomap, iomap_size); |
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| 60 | CPU->arch.tss->iomap[iomap_size] = 0xff; /* terminating byte */ |
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| 61 | } |
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| 62 | spinlock_unlock(&TASK->lock); |
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| 63 | |||
| 64 | /* Second, adjust TSS segment limit. */ |
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| 65 | gdtr_store(&cpugdtr); |
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| 66 | gdt_p = (descriptor_t *) cpugdtr.base; |
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| 67 | gdt_tss_setlimit(&gdt_p[TSS_DES], TSS_BASIC_SIZE + iomap_size - 1); |
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| 68 | gdtr_load(&cpugdtr); |
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| 1190 | jermar | 69 | } |
| 1187 | jermar | 70 | |
| 1190 | jermar | 71 | /** Perform amd64 specific tasks needed before the new thread is scheduled. */ |
| 72 | void before_thread_runs_arch(void) |
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| 73 | { |
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| 74 | CPU->arch.tss->rsp0 = (__address) &THREAD->kstack[THREAD_STACK_SIZE-SP_DELTA]; |
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| 75 | |||
| 76 | /* Syscall support - write address of thread stack pointer to |
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| 77 | * hidden part of gs */ |
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| 78 | swapgs(); |
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| 79 | write_msr(AMD_MSR_GS, (__u64)&THREAD->kstack); |
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| 80 | swapgs(); |
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| 81 | |||
| 82 | /* TLS support - set FS to thread local storage */ |
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| 83 | write_msr(AMD_MSR_FS, THREAD->arch.tls); |
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| 84 | |||
| 1072 | palkovsky | 85 | #ifdef CONFIG_DEBUG_AS_WATCHPOINT |
| 86 | /* Set watchpoint on AS to ensure that nobody sets it to zero */ |
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| 1077 | palkovsky | 87 | if (CPU->id < BKPOINTS_MAX) |
| 88 | breakpoint_add(&((the_t *) THREAD->kstack)->as, |
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| 89 | BKPOINT_WRITE | BKPOINT_CHECK_ZERO, |
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| 90 | CPU->id); |
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| 1072 | palkovsky | 91 | #endif |
| 257 | palkovsky | 92 | } |
| 897 | jermar | 93 | |
| 94 | void after_thread_ran_arch(void) |
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| 95 | { |
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| 96 | } |