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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 | |||
29 | #include <proc/scheduler.h> |
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30 | #include <proc/thread.h> |
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31 | #include <arch.h> |
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911 | jermar | 32 | #include <arch/register.h> |
912 | jermar | 33 | #include <arch/context.h> |
916 | jermar | 34 | #include <arch/stack.h> |
901 | jermar | 35 | #include <arch/mm/tlb.h> |
36 | #include <config.h> |
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37 | #include <align.h> |
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38 | |||
1187 | jermar | 39 | /** Perform ia64 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 | |||
916 | jermar | 44 | /** Prepare kernel stack pointers in bank 0 r22 and r23 and make sure the stack is mapped in DTR. */ |
901 | jermar | 45 | void before_thread_runs_arch(void) |
46 | { |
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47 | __address base; |
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48 | |||
49 | base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH); |
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50 | |||
1138 | jermar | 51 | if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + (1<<(KERNEL_PAGE_WIDTH))) { |
901 | jermar | 52 | /* |
903 | jermar | 53 | * Kernel stack of this thread is not mapped by DTR[TR_KERNEL]. |
1138 | jermar | 54 | * Use DTR[TR_KSTACK1] and DTR[TR_KSTACK2] to map it. |
901 | jermar | 55 | */ |
1138 | jermar | 56 | dtlb_kernel_mapping_insert((__address) THREAD->kstack, KA2PA(THREAD->kstack), true, DTR_KSTACK1); |
57 | dtlb_kernel_mapping_insert((__address) THREAD->kstack + PAGE_SIZE, KA2PA(THREAD->kstack) + FRAME_SIZE, true, DTR_KSTACK2); |
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901 | jermar | 58 | } |
903 | jermar | 59 | |
60 | /* |
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916 | jermar | 61 | * Record address of kernel backing store to bank 0 r22. |
62 | * Record address of kernel stack to bank 0 r23. |
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63 | * These values will be found there after switch from userspace. |
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903 | jermar | 64 | */ |
911 | jermar | 65 | __asm__ volatile ( |
66 | "bsw.0\n" |
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916 | jermar | 67 | "mov r22 = %0\n" |
68 | "mov r23 = %1\n" |
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911 | jermar | 69 | "bsw.1\n" |
916 | jermar | 70 | : |
993 | jermar | 71 | : "r" (&THREAD->kstack[THREAD_STACK_SIZE]), |
935 | vana | 72 | "r" (&THREAD->kstack[THREAD_STACK_SIZE - SP_DELTA]) |
73 | ); |
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901 | jermar | 74 | } |
75 | |||
76 | void after_thread_ran_arch(void) |
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77 | { |
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78 | } |