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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2015 Google, Inc
*
* EFI information obtained here:
* http://wiki.phoenix.com/wiki/index.php/EFI_BOOT_SERVICES
*
* This file implements U-Boot running as an EFI application.
*/
#include <common.h>
#include <cpu_func.h>
#include <debug_uart.h>
#include <dm.h>
#include <errno.h>
#include <init.h>
#include <malloc.h>
#include <asm/global_data.h>
#include <linux/err.h>
#include <linux/types.h>
#include <efi.h>
#include <efi_api.h>
#include <sysreset.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/root.h>
DECLARE_GLOBAL_DATA_PTR;
int efi_info_get(enum efi_entry_t type, void **datap, int *sizep)
{
return -ENOSYS;
}
int efi_get_mmap(struct efi_mem_desc **descp, int *sizep, uint *keyp,
int *desc_sizep, uint *versionp)
{
struct efi_priv *priv = efi_get_priv();
struct efi_boot_services *boot = priv->sys_table->boottime;
efi_uintn_t size, desc_size, key;
struct efi_mem_desc *desc;
efi_status_t ret;
u32 version;
/* Get the memory map so we can switch off EFI */
size = 0;
ret = boot->get_memory_map(&size, NULL, &key, &desc_size, &version);
if (ret != EFI_BUFFER_TOO_SMALL)
return log_msg_ret("get", -ENOMEM);
desc = malloc(size);
if (!desc)
return log_msg_ret("mem", -ENOMEM);
ret = boot->get_memory_map(&size, desc, &key, &desc_size, &version);
if (ret)
return log_msg_ret("get", -EINVAL);
*descp = desc;
*sizep = size;
*desc_sizep = desc_size;
*versionp = version;
*keyp = key;
return 0;
}
/**
* efi_bind_block() - bind a new block device to an EFI device
*
* Binds a new top-level EFI_MEDIA device as well as a child block device so
* that the block device can be accessed in U-Boot.
*
* The device can then be accessed using 'part list efi 0', 'fat ls efi 0:1',
* for example, just like any other interface type.
*
* @handle: handle of the controller on which this driver is installed
* @blkio: block io protocol proxied by this driver
* @device_path: EFI device path structure for this
* @len: Length of @device_path in bytes
* @devp: Returns the bound device
* Return: 0 if OK, -ve on error
*/
int efi_bind_block(efi_handle_t handle, struct efi_block_io *blkio,
struct efi_device_path *device_path, int len,
struct udevice **devp)
{
struct efi_media_plat plat;
struct udevice *dev;
char name[18];
int ret;
plat.handle = handle;
plat.blkio = blkio;
plat.device_path = malloc(device_path->length);
if (!plat.device_path)
return log_msg_ret("path", -ENOMEM);
memcpy(plat.device_path, device_path, device_path->length);
ret = device_bind(dm_root(), DM_DRIVER_GET(efi_media), "efi_media",
&plat, ofnode_null(), &dev);
if (ret)
return log_msg_ret("bind", ret);
snprintf(name, sizeof(name), "efi_media_%x", dev_seq(dev));
device_set_name(dev, name);
*devp = dev;
return 0;
}
static efi_status_t setup_memory(struct efi_priv *priv)
{
struct efi_boot_services *boot = priv->boot;
efi_physical_addr_t addr;
efi_status_t ret;
int pages;
/*
* Use global_data_ptr instead of gd since it is an assignment. There
* are very few assignments to global_data in U-Boot and this makes
* it easier to find them.
*/
global_data_ptr = efi_malloc(priv, sizeof(struct global_data), &ret);
if (!global_data_ptr)
return ret;
memset(gd, '\0', sizeof(*gd));
gd->malloc_base = (ulong)efi_malloc(priv, CONFIG_VAL(SYS_MALLOC_F_LEN),
&ret);
if (!gd->malloc_base)
return ret;
pages = CONFIG_EFI_RAM_SIZE >> 12;
/*
* Don't allocate any memory above 4GB. U-Boot is a 32-bit application
* so we want it to load below 4GB.
*/
addr = 1ULL << 32;
ret = boot->allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
priv->image_data_type, pages, &addr);
if (ret) {
log_info("(using pool %lx) ", ret);
priv->ram_base = (ulong)efi_malloc(priv, CONFIG_EFI_RAM_SIZE,
&ret);
if (!priv->ram_base)
return ret;
priv->use_pool_for_malloc = true;
} else {
log_info("(using allocated RAM address %lx) ", (ulong)addr);
priv->ram_base = addr;
}
gd->ram_size = pages << 12;
return 0;
}
/**
* free_memory() - Free memory used by the U-Boot app
*
* This frees memory allocated in setup_memory(), in preparation for returning
* to UEFI. It also zeroes the global_data pointer.
*
* @priv: Private EFI data
*/
static void free_memory(struct efi_priv *priv)
{
struct efi_boot_services *boot = priv->boot;
if (priv->use_pool_for_malloc)
efi_free(priv, (void *)priv->ram_base);
else
boot->free_pages(priv->ram_base, gd->ram_size >> 12);
efi_free(priv, (void *)gd->malloc_base);
efi_free(priv, gd);
global_data_ptr = NULL;
}
/**
* devpath_is_partition() - Figure out if a device path is a partition
*
* Checks if a device path refers to a partition on some media device. This
* works by checking for a valid partition number in a hard-driver media device
* as the final component of the device path.
*
* @path: device path
* Return: true if a partition, false if not
* (e.g. it might be media which contains partitions)
*/
static bool devpath_is_partition(const struct efi_device_path *path)
{
const struct efi_device_path *p;
bool was_part;
for (p = path; p->type != DEVICE_PATH_TYPE_END;
p = (void *)p + p->length) {
was_part = false;
if (p->type == DEVICE_PATH_TYPE_MEDIA_DEVICE &&
p->sub_type == DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH) {
struct efi_device_path_hard_drive_path *hd =
(void *)path;
if (hd->partition_number)
was_part = true;
}
}
return was_part;
}
/**
* setup_block() - Find all block devices and setup EFI devices for them
*
* Partitions are ignored, since U-Boot has partition handling. Errors with
* particular devices produce a warning but execution continues to try to
* find others.
*
* Return: 0 if found, -ENOSYS if there is no boot-services table, -ENOTSUPP
* if a required protocol is not supported
*/
static int setup_block(void)
{
efi_guid_t efi_blkio_guid = EFI_BLOCK_IO_PROTOCOL_GUID;
efi_guid_t efi_devpath_guid = EFI_DEVICE_PATH_PROTOCOL_GUID;
efi_guid_t efi_pathutil_guid = EFI_DEVICE_PATH_UTILITIES_PROTOCOL_GUID;
efi_guid_t efi_pathtext_guid = EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID;
struct efi_boot_services *boot = efi_get_boot();
struct efi_device_path_utilities_protocol *util;
struct efi_device_path_to_text_protocol *text;
struct efi_device_path *path;
struct efi_block_io *blkio;
efi_uintn_t num_handles;
efi_handle_t *handle;
int ret, i;
if (!boot)
return log_msg_ret("sys", -ENOSYS);
/* Find all devices which support the block I/O protocol */
ret = boot->locate_handle_buffer(BY_PROTOCOL, &efi_blkio_guid, NULL,
&num_handles, &handle);
if (ret)
return log_msg_ret("loc", -ENOTSUPP);
log_debug("Found %d handles:\n", (int)num_handles);
/* We need to look up the path size and convert it to text */
ret = boot->locate_protocol(&efi_pathutil_guid, NULL, (void **)&util);
if (ret)
return log_msg_ret("util", -ENOTSUPP);
ret = boot->locate_protocol(&efi_pathtext_guid, NULL, (void **)&text);
if (ret)
return log_msg_ret("text", -ENOTSUPP);
for (i = 0; i < num_handles; i++) {
struct udevice *dev;
const u16 *name;
bool is_part;
int len;
ret = boot->handle_protocol(handle[i], &efi_devpath_guid,
(void **)&path);
if (ret) {
log_warning("- devpath %d failed (ret=%d)\n", i, ret);
continue;
}
ret = boot->handle_protocol(handle[i], &efi_blkio_guid,
(void **)&blkio);
if (ret) {
log_warning("- blkio %d failed (ret=%d)\n", i, ret);
continue;
}
name = text->convert_device_path_to_text(path, true, false);
is_part = devpath_is_partition(path);
if (!is_part) {
len = util->get_device_path_size(path);
ret = efi_bind_block(handle[i], blkio, path, len, &dev);
if (ret) {
log_warning("- blkio bind %d failed (ret=%d)\n",
i, ret);
continue;
}
} else {
dev = NULL;
}
/*
* Show the device name if we created one. Otherwise indicate
* that it is a partition.
*/
printf("%2d: %-12s %ls\n", i, dev ? dev->name : "<partition>",
name);
}
boot->free_pool(handle);
return 0;
}
/**
* dm_scan_other() - Scan for UEFI devices that should be available to U-Boot
*
* This sets up block devices within U-Boot for those found in UEFI. With this,
* U-Boot can access those devices
*
* @pre_reloc_only: true to only bind pre-relocation devices (ignored)
* Returns: 0 on success, -ve on error
*/
int dm_scan_other(bool pre_reloc_only)
{
if (gd->flags & GD_FLG_RELOC) {
int ret;
ret = setup_block();
if (ret)
return ret;
}
return 0;
}
/**
* efi_main() - Start an EFI image
*
* This function is called by our EFI start-up code. It handles running
* U-Boot. If it returns, EFI will continue. Another way to get back to EFI
* is via reset_cpu().
*/
efi_status_t EFIAPI efi_main(efi_handle_t image,
struct efi_system_table *sys_table)
{
struct efi_priv local_priv, *priv = &local_priv;
efi_status_t ret;
/* Set up access to EFI data structures */
ret = efi_init(priv, "App", image, sys_table);
if (ret) {
printf("Failed to set up U-Boot: err=%lx\n", ret);
return ret;
}
efi_set_priv(priv);
/*
* Set up the EFI debug UART so that printf() works. This is
* implemented in the EFI serial driver, serial_efi.c. The application
* can use printf() freely.
*/
debug_uart_init();
ret = setup_memory(priv);
if (ret) {
printf("Failed to set up memory: ret=%lx\n", ret);
return ret;
}
/*
* We could store the EFI memory map here, but it changes all the time,
* so this is only useful for debugging.
*
* ret = efi_store_memory_map(priv);
* if (ret)
* return ret;
*/
printf("starting\n");
board_init_f(GD_FLG_SKIP_RELOC);
board_init_r(NULL, 0);
free_memory(priv);
return EFI_SUCCESS;
}
static void efi_exit(void)
{
struct efi_priv *priv = efi_get_priv();
free_memory(priv);
printf("U-Boot EFI exiting\n");
priv->boot->exit(priv->parent_image, EFI_SUCCESS, 0, NULL);
}
static int efi_sysreset_request(struct udevice *dev, enum sysreset_t type)
{
efi_exit();
return -EINPROGRESS;
}
static const struct udevice_id efi_sysreset_ids[] = {
{ .compatible = "efi,reset" },
{ }
};
static struct sysreset_ops efi_sysreset_ops = {
.request = efi_sysreset_request,
};
U_BOOT_DRIVER(efi_sysreset) = {
.name = "efi-sysreset",
.id = UCLASS_SYSRESET,
.of_match = efi_sysreset_ids,
.ops = &efi_sysreset_ops,
};