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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 | |||
| 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 | |||
| 916 | jermar | 39 | /** Prepare kernel stack pointers in bank 0 r22 and r23 and make sure the stack is mapped in DTR. */ |
| 901 | jermar | 40 | void before_thread_runs_arch(void) |
| 41 | { |
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| 42 | __address base; |
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| 43 | |||
| 44 | base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH); |
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| 45 | |||
| 46 | if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + (1<<KERNEL_PAGE_WIDTH)) { |
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| 47 | /* |
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| 903 | jermar | 48 | * Kernel stack of this thread is not mapped by DTR[TR_KERNEL]. |
| 49 | * Use DTR[TR_KSTACK] to map it. |
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| 901 | jermar | 50 | */ |
| 902 | jermar | 51 | dtlb_kernel_mapping_insert((__address) THREAD->kstack, KA2PA(THREAD->kstack), true, DTR_KSTACK); |
| 901 | jermar | 52 | } |
| 903 | jermar | 53 | |
| 54 | /* |
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| 916 | jermar | 55 | * Record address of kernel backing store to bank 0 r22. |
| 56 | * Record address of kernel stack to bank 0 r23. |
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| 57 | * These values will be found there after switch from userspace. |
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| 903 | jermar | 58 | */ |
| 911 | jermar | 59 | __asm__ volatile ( |
| 60 | "bsw.0\n" |
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| 916 | jermar | 61 | "mov r22 = %0\n" |
| 62 | "mov r23 = %1\n" |
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| 911 | jermar | 63 | "bsw.1\n" |
| 916 | jermar | 64 | : |
| 65 | : "r" (((__address) THREAD->kstack) + ALIGN_UP(sizeof(the_t), REGISTER_STACK_ALIGNMENT)), |
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| 66 | "r" (&THREAD->kstack[THREAD_STACK_SIZE - SP_DELTA])); |
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| 901 | jermar | 67 | } |
| 68 | |||
| 69 | void after_thread_ran_arch(void) |
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| 70 | { |
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| 71 | } |