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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * efi_selftest_pos
- *
- * Copyright (c) 2018 Heinrich Schuchardt <xypron.glpk@gmx.de>
- *
- * Test the EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.
- *
- * The following services are tested:
- * OutputString, TestString, SetAttribute.
- */
- #include <efi_selftest.h>
- #include <linux/libfdt.h>
- static struct efi_boot_services *boottime;
- static const char *fdt;
- /* This should be sufficent for */
- #define BUFFERSIZE 0x100000
- static efi_guid_t fdt_guid = EFI_FDT_GUID;
- /*
- * Convert FDT value to host endianness.
- *
- * @val FDT value
- * @return converted value
- */
- static uint32_t f2h(fdt32_t val)
- {
- char *buf = (char *)&val;
- char i;
- #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
- /* Swap the bytes */
- i = buf[0]; buf[0] = buf[3]; buf[3] = i;
- i = buf[1]; buf[1] = buf[2]; buf[2] = i;
- #endif
- return *(uint32_t *)buf;
- }
- /*
- * Return the value of a property of the FDT root node.
- *
- * @name name of the property
- * @return value of the property
- */
- static char *get_property(const u16 *property)
- {
- struct fdt_header *header = (struct fdt_header *)fdt;
- const fdt32_t *pos;
- const char *strings;
- if (!header)
- return NULL;
- if (f2h(header->magic) != FDT_MAGIC) {
- printf("Wrong magic\n");
- return NULL;
- }
- pos = (fdt32_t *)(fdt + f2h(header->off_dt_struct));
- strings = fdt + f2h(header->off_dt_strings);
- for (;;) {
- switch (f2h(pos[0])) {
- case FDT_BEGIN_NODE: {
- char *c = (char *)&pos[1];
- size_t i;
- for (i = 0; c[i]; ++i)
- ;
- pos = &pos[2 + (i >> 2)];
- break;
- }
- case FDT_PROP: {
- struct fdt_property *prop = (struct fdt_property *)pos;
- const char *label = &strings[f2h(prop->nameoff)];
- efi_status_t ret;
- /* Check if this is the property to be returned */
- if (!efi_st_strcmp_16_8(property, label)) {
- char *str;
- efi_uintn_t len = f2h(prop->len);
- if (!len)
- return NULL;
- /*
- * The string might not be 0 terminated.
- * It is safer to make a copy.
- */
- ret = boottime->allocate_pool(
- EFI_LOADER_DATA, len + 1,
- (void **)&str);
- if (ret != EFI_SUCCESS) {
- efi_st_printf("AllocatePool failed\n");
- return NULL;
- }
- boottime->copy_mem(str, &pos[3], len);
- str[len] = 0;
- return str;
- }
- pos = &pos[3 + ((f2h(prop->len) + 3) >> 2)];
- break;
- }
- case FDT_NOP:
- pos = &pos[1];
- break;
- default:
- return NULL;
- }
- }
- }
- /*
- * Setup unit test.
- *
- * @handle: handle of the loaded image
- * @systable: system table
- * @return: EFI_ST_SUCCESS for success
- */
- static int setup(const efi_handle_t img_handle,
- const struct efi_system_table *systable)
- {
- efi_uintn_t i;
- boottime = systable->boottime;
- /* Find configuration tables */
- for (i = 0; i < systable->nr_tables; ++i) {
- if (!efi_st_memcmp(&systable->tables[i].guid, &fdt_guid,
- sizeof(efi_guid_t)))
- fdt = systable->tables[i].table;
- }
- if (!fdt) {
- efi_st_error("Missing device tree\n");
- return EFI_ST_FAILURE;
- }
- return EFI_ST_SUCCESS;
- }
- /*
- * Execute unit test.
- *
- * @return: EFI_ST_SUCCESS for success
- */
- static int execute(void)
- {
- char *str;
- efi_status_t ret;
- str = get_property(L"compatible");
- if (str) {
- efi_st_printf("compatible: %s\n", str);
- ret = boottime->free_pool(str);
- if (ret != EFI_SUCCESS) {
- efi_st_error("FreePool failed\n");
- return EFI_ST_FAILURE;
- }
- } else {
- efi_st_printf("Missing property 'compatible'\n");
- return EFI_ST_FAILURE;
- }
- str = get_property(L"serial-number");
- if (str) {
- efi_st_printf("serial-number: %s\n", str);
- ret = boottime->free_pool(str);
- if (ret != EFI_SUCCESS) {
- efi_st_error("FreePool failed\n");
- return EFI_ST_FAILURE;
- }
- }
- return EFI_ST_SUCCESS;
- }
- EFI_UNIT_TEST(fdt) = {
- .name = "device tree",
- .phase = EFI_EXECUTE_BEFORE_BOOTTIME_EXIT,
- .setup = setup,
- .execute = execute,
- .on_request = true,
- };
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