| 1 | /*
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| 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 |
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| 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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| 32 | #include <arch/register.h>
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| 33 | #include <arch/context.h>
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| 34 | #include <arch/stack.h>
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| 35 | #include <arch/mm/tlb.h>
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| 36 | #include <config.h>
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| 37 | #include <align.h>
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| 38 |
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| 39 | /** Prepare kernel stack pointers in bank 0 r22 and r23 and make sure the stack is mapped in DTR. */
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| 40 | void before_thread_runs_arch(void)
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| 41 | {
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| 42 | __address base;
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| 43 |
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| 44 | base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
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| 45 |
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| 46 | if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + (1<<KERNEL_PAGE_WIDTH)) {
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| 47 | /*
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| 48 | * Kernel stack of this thread is not mapped by DTR[TR_KERNEL].
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| 49 | * Use DTR[TR_KSTACK] to map it.
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| 50 | */
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| 51 | dtlb_kernel_mapping_insert((__address) THREAD->kstack, KA2PA(THREAD->kstack), true, DTR_KSTACK);
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| 52 | }
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| 53 |
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| 54 | /*
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| 55 | * Record address of kernel backing store to bank 0 r22.
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| 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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| 58 | */
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| 59 | __asm__ volatile (
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| 60 | "bsw.0\n"
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| 61 | "mov r22 = %0\n"
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| 62 | "mov r23 = %1\n"
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| 63 | "bsw.1\n"
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| 64 | :
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| 65 | : "r" (&THREAD->kstack[THREAD_STACK_SIZE]),
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| 66 | "r" (&THREAD->kstack[THREAD_STACK_SIZE - SP_DELTA])
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| 67 | );
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| 68 | }
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| 69 |
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| 70 | void after_thread_ran_arch(void)
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| 71 | {
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| 72 | }
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