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/*
* Copyright (c) 2014 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
* The purpose of this test module is to check that the pmap module properly
* synchronizes page tables across processors. Two threads are created and
* bound to processors 0 and 1 respectively. The first thread allocates a
* page and writes it, making sure physical mappings are up-to-date locally.
* It then transfers the page address to the second thread which validates
* the content of the page, an operation that can only be done if the page
* tables of the current processor have been updated.
*/
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <kern/condition.h>
#include <kern/cpumap.h>
#include <kern/error.h>
#include <kern/init.h>
#include <kern/mutex.h>
#include <kern/panic.h>
#include <kern/thread.h>
#include <machine/page.h>
#include <test/test.h>
#include <vm/vm_kmem.h>
static struct condition test_condition;
static struct mutex test_lock;
static void *test_va;
static void
test_run1(void *arg)
{
void *ptr;
(void)arg;
printf("allocating page\n");
ptr = vm_kmem_alloc(PAGE_SIZE);
printf("writing page\n");
memset(ptr, 'a', PAGE_SIZE);
printf("passing page to second thread (%p)\n", ptr);
mutex_lock(&test_lock);
test_va = ptr;
condition_signal(&test_condition);
mutex_unlock(&test_lock);
}
static void
test_run2(void *arg)
{
char *ptr;
unsigned int i;
(void)arg;
printf("waiting for page\n");
mutex_lock(&test_lock);
while (test_va == NULL) {
condition_wait(&test_condition, &test_lock);
}
ptr = test_va;
mutex_unlock(&test_lock);
printf("page received (%p), checking page\n", ptr);
for (i = 0; i < PAGE_SIZE; i++) {
if (ptr[i] != 'a') {
panic("invalid content");
}
}
vm_kmem_free(ptr, PAGE_SIZE);
printf("done\n");
}
void __init
test_setup(void)
{
struct thread_attr attr;
struct thread *thread;
struct cpumap *cpumap;
int error;
condition_init(&test_condition);
mutex_init(&test_lock);
test_va = NULL;
error = cpumap_create(&cpumap);
error_check(error, "cpumap_create");
cpumap_zero(cpumap);
cpumap_set(cpumap, 0);
thread_attr_init(&attr, THREAD_KERNEL_PREFIX "test_run1");
thread_attr_set_detached(&attr);
thread_attr_set_cpumap(&attr, cpumap);
error = thread_create(&thread, &attr, test_run1, NULL);
error_check(error, "thread_create");
cpumap_zero(cpumap);
cpumap_set(cpumap, 1);
thread_attr_init(&attr, THREAD_KERNEL_PREFIX "test_run2");
thread_attr_set_detached(&attr);
thread_attr_set_cpumap(&attr, cpumap);
error = thread_create(&thread, &attr, test_run2, NULL);
error_check(error, "thread_create");
cpumap_destroy(cpumap);
}
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