| 1 | /*
|
|---|
| 2 | * Copyright (C) 2006 Jakub Jermar
|
|---|
| 3 | * All rights reserved.
|
|---|
| 4 | *
|
|---|
| 5 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | * modification, are permitted provided that the following conditions
|
|---|
| 7 | * are met:
|
|---|
| 8 | *
|
|---|
| 9 | * - Redistributions of source code must retain the above copyright
|
|---|
| 10 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | * - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 13 | * documentation and/or other materials provided with the distribution.
|
|---|
| 14 | * - The name of the author may not be used to endorse or promote products
|
|---|
| 15 | * derived from this software without specific prior written permission.
|
|---|
| 16 | *
|
|---|
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | #include <proc/scheduler.h>
|
|---|
| 30 | #include <proc/thread.h>
|
|---|
| 31 | #include <arch.h>
|
|---|
| 32 | #include <arch/register.h>
|
|---|
| 33 | #include <arch/context.h>
|
|---|
| 34 | #include <arch/mm/tlb.h>
|
|---|
| 35 | #include <config.h>
|
|---|
| 36 | #include <align.h>
|
|---|
| 37 |
|
|---|
| 38 | /** Record kernel stack address in bank 0 r23 and make sure it is mapped in DTR. */
|
|---|
| 39 | void before_thread_runs_arch(void)
|
|---|
| 40 | {
|
|---|
| 41 | __address base;
|
|---|
| 42 |
|
|---|
| 43 | base = ALIGN_DOWN(config.base, 1<<KERNEL_PAGE_WIDTH);
|
|---|
| 44 |
|
|---|
| 45 | if ((__address) THREAD->kstack < base || (__address) THREAD->kstack > base + (1<<KERNEL_PAGE_WIDTH)) {
|
|---|
| 46 | /*
|
|---|
| 47 | * Kernel stack of this thread is not mapped by DTR[TR_KERNEL].
|
|---|
| 48 | * Use DTR[TR_KSTACK] to map it.
|
|---|
| 49 | */
|
|---|
| 50 | dtlb_kernel_mapping_insert((__address) THREAD->kstack, KA2PA(THREAD->kstack), true, DTR_KSTACK);
|
|---|
| 51 | }
|
|---|
| 52 |
|
|---|
| 53 | /*
|
|---|
| 54 | * Record address of kernel stack to bank 0 r23
|
|---|
| 55 | * where it will be found after switch from userspace.
|
|---|
| 56 | */
|
|---|
| 57 | __asm__ volatile (
|
|---|
| 58 | "bsw.0\n"
|
|---|
| 59 | "mov r23 = %0\n"
|
|---|
| 60 | "bsw.1\n"
|
|---|
| 61 | : : "r" (&THREAD->kstack[THREAD_STACK_SIZE - SP_DELTA]));
|
|---|
| 62 | }
|
|---|
| 63 |
|
|---|
| 64 | void after_thread_ran_arch(void)
|
|---|
| 65 | {
|
|---|
| 66 | }
|
|---|
