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tests: add basic k_mem_map() test

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Show we can measure free memory properly and map a page of
anonymous memory, which has been zeroed and is writable.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2021-01-11 09:04:08 -08:00 • committed by Anas Nashif
commit 146eaf4335
1 changed files with 44 additions and 1 deletions
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45
tests/kernel/mem_protect/mem_map/src/main.c
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@ -165,6 +165,48 @@ void test_z_phys_map_side_effect(void)
ztest_test_fail();
}
/**
* Basic k_mem_map() functionality
*
* Does not exercise K_MEM_MAP_* control flags, just default behavior
*/
void test_k_mem_map(void)
{
size_t free_mem, free_mem_after_map;
char *mapped;
int i;
free_mem = k_mem_free_get();
zassert_not_equal(free_mem, 0, "no free memory");
printk("Free memory: %zu\n", free_mem);
mapped = k_mem_map(CONFIG_MMU_PAGE_SIZE, K_MEM_PERM_RW);
zassert_not_null(mapped, "failed to map memory");
printk("mapped a page to %p\n", mapped);
/* Page should be zeroed */
for (i = 0; i < CONFIG_MMU_PAGE_SIZE; i++) {
zassert_equal(mapped[i], '\x00', "page not zeroed");
}
free_mem_after_map = k_mem_free_get();
printk("Free memory now: %zu\n", free_mem_after_map);
zassert_equal(free_mem, free_mem_after_map + CONFIG_MMU_PAGE_SIZE,
"incorrect free memory accounting");
/* Show we can write to page without exploding */
(void)memset(mapped, '\xFF', CONFIG_MMU_PAGE_SIZE);
for (i = 0; i < CONFIG_MMU_PAGE_SIZE; i++) {
zassert_true(mapped[i] == '\xFF',
"incorrect value 0x%hhx read at index %d",
mapped[i], i);
}
/* TODO: Un-map the mapped page to clean up, once we have that
* capability
*/
}
/* ztest main entry*/
void test_main(void)
{
@ -177,7 +219,8 @@ void test_main(void)
ztest_test_suite(test_mem_map,
ztest_unit_test(test_z_phys_map_rw),
ztest_unit_test(test_z_phys_map_exec),
ztest_unit_test(test_z_phys_map_side_effect)
ztest_unit_test(test_z_phys_map_side_effect),
ztest_unit_test(test_k_mem_map)
);
ztest_run_test_suite(test_mem_map);
}