efi_selftest_fdt.c
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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 const struct efi_system_table *systemtab;
static const struct efi_boot_services *boottime;
static const char *fdt;
/* This should be sufficient for */
#define BUFFERSIZE 0x100000
static const efi_guid_t fdt_guid = EFI_FDT_GUID;
static const efi_guid_t acpi_guid = EFI_ACPI_TABLE_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;
}
}
}
/**
* efi_st_get_config_table() - get configuration table
*
* @guid: GUID of the configuration table
* Return: pointer to configuration table or NULL
*/
static void *efi_st_get_config_table(const efi_guid_t *guid)
{
size_t i;
for (i = 0; i < systab.nr_tables; i++) {
if (!guidcmp(guid, &systemtab->tables[i].guid))
return systemtab->tables[i].table;
}
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)
{
void *acpi;
systemtab = systable;
boottime = systable->boottime;
acpi = efi_st_get_config_table(&acpi_guid);
fdt = efi_st_get_config_table(&fdt_guid);
if (!fdt) {
efi_st_error("Missing device tree\n");
return EFI_ST_FAILURE;
}
if (acpi) {
efi_st_error("Found ACPI table and 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,
};