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| Rev | Author | Line No. | Line |
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| 901 | jermar | 1 | /* |
| 2 | * Copyright (C) 2006 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 | |||
| 1705 | cejka | 29 | /** @addtogroup ia64proc |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 901 | jermar | 35 | #include <proc/scheduler.h> |
| 36 | #include <proc/thread.h> |
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| 37 | #include <arch.h> |
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| 911 | jermar | 38 | #include <arch/register.h> |
| 912 | jermar | 39 | #include <arch/context.h> |
| 916 | jermar | 40 | #include <arch/stack.h> |
| 901 | jermar | 41 | #include <arch/mm/tlb.h> |
| 42 | #include <config.h> |
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| 43 | #include <align.h> |
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| 44 | |||
| 1187 | jermar | 45 | /** Perform ia64 specific tasks needed before the new task is run. */ |
| 46 | void before_task_runs_arch(void) |
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| 47 | { |
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| 48 | } |
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| 49 | |||
| 916 | jermar | 50 | /** Prepare kernel stack pointers in bank 0 r22 and r23 and make sure the stack is mapped in DTR. */ |
| 901 | jermar | 51 | void before_thread_runs_arch(void) |
| 52 | { |
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| 53 | __address base; |
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| 54 | |||
| 55 | base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH); |
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| 56 | |||
| 1138 | jermar | 57 | if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + (1<<(KERNEL_PAGE_WIDTH))) { |
| 901 | jermar | 58 | /* |
| 903 | jermar | 59 | * Kernel stack of this thread is not mapped by DTR[TR_KERNEL]. |
| 1138 | jermar | 60 | * Use DTR[TR_KSTACK1] and DTR[TR_KSTACK2] to map it. |
| 901 | jermar | 61 | */ |
| 1675 | jermar | 62 | |
| 63 | /* purge DTR[TR_STACK1] and DTR[TR_STACK2] */ |
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| 64 | dtr_purge((__address) THREAD->kstack, PAGE_WIDTH+1); |
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| 65 | |||
| 66 | /* insert DTR[TR_STACK1] and DTR[TR_STACK2] */ |
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| 1138 | jermar | 67 | dtlb_kernel_mapping_insert((__address) THREAD->kstack, KA2PA(THREAD->kstack), true, DTR_KSTACK1); |
| 68 | dtlb_kernel_mapping_insert((__address) THREAD->kstack + PAGE_SIZE, KA2PA(THREAD->kstack) + FRAME_SIZE, true, DTR_KSTACK2); |
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| 901 | jermar | 69 | } |
| 903 | jermar | 70 | |
| 71 | /* |
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| 916 | jermar | 72 | * Record address of kernel backing store to bank 0 r22. |
| 73 | * Record address of kernel stack to bank 0 r23. |
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| 74 | * These values will be found there after switch from userspace. |
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| 903 | jermar | 75 | */ |
| 911 | jermar | 76 | __asm__ volatile ( |
| 77 | "bsw.0\n" |
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| 916 | jermar | 78 | "mov r22 = %0\n" |
| 79 | "mov r23 = %1\n" |
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| 911 | jermar | 80 | "bsw.1\n" |
| 916 | jermar | 81 | : |
| 993 | jermar | 82 | : "r" (&THREAD->kstack[THREAD_STACK_SIZE]), |
| 935 | vana | 83 | "r" (&THREAD->kstack[THREAD_STACK_SIZE - SP_DELTA]) |
| 84 | ); |
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| 901 | jermar | 85 | } |
| 86 | |||
| 87 | void after_thread_ran_arch(void) |
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| 88 | { |
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| 89 | } |
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| 1702 | cejka | 90 | |
| 91 | /** @} |
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| 92 | */ |
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| 93 |