mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 11:00:15 +00:00
dd1086ac6b
If the path consists only of an end node, it does not refer to a partition. Avoid returning a random value from the stack in this case. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
405 lines
10 KiB
C
405 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2015 Google, Inc
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*
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* EFI information obtained here:
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* http://wiki.phoenix.com/wiki/index.php/EFI_BOOT_SERVICES
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*
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* This file implements U-Boot running as an EFI application.
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*/
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#include <common.h>
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#include <cpu_func.h>
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#include <debug_uart.h>
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#include <dm.h>
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#include <errno.h>
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#include <init.h>
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#include <malloc.h>
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#include <asm/global_data.h>
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#include <linux/err.h>
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#include <linux/types.h>
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#include <efi.h>
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#include <efi_api.h>
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#include <sysreset.h>
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#include <dm/device-internal.h>
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#include <dm/lists.h>
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#include <dm/root.h>
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DECLARE_GLOBAL_DATA_PTR;
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int efi_info_get(enum efi_entry_t type, void **datap, int *sizep)
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{
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return -ENOSYS;
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}
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int efi_get_mmap(struct efi_mem_desc **descp, int *sizep, uint *keyp,
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int *desc_sizep, uint *versionp)
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{
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struct efi_priv *priv = efi_get_priv();
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struct efi_boot_services *boot = priv->sys_table->boottime;
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efi_uintn_t size, desc_size, key;
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struct efi_mem_desc *desc;
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efi_status_t ret;
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u32 version;
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/* Get the memory map so we can switch off EFI */
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size = 0;
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ret = boot->get_memory_map(&size, NULL, &key, &desc_size, &version);
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if (ret != EFI_BUFFER_TOO_SMALL)
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return log_msg_ret("get", -ENOMEM);
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desc = malloc(size);
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if (!desc)
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return log_msg_ret("mem", -ENOMEM);
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ret = boot->get_memory_map(&size, desc, &key, &desc_size, &version);
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if (ret)
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return log_msg_ret("get", -EINVAL);
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*descp = desc;
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*sizep = size;
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*desc_sizep = desc_size;
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*versionp = version;
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*keyp = key;
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return 0;
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}
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/**
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* efi_bind_block() - bind a new block device to an EFI device
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*
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* Binds a new top-level EFI_MEDIA device as well as a child block device so
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* that the block device can be accessed in U-Boot.
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*
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* The device can then be accessed using 'part list efi 0', 'fat ls efi 0:1',
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* for example, just like any other interface type.
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*
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* @handle: handle of the controller on which this driver is installed
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* @blkio: block io protocol proxied by this driver
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* @device_path: EFI device path structure for this
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* @len: Length of @device_path in bytes
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* @devp: Returns the bound device
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* Return: 0 if OK, -ve on error
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*/
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int efi_bind_block(efi_handle_t handle, struct efi_block_io *blkio,
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struct efi_device_path *device_path, int len,
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struct udevice **devp)
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{
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struct efi_media_plat plat;
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struct udevice *dev;
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char name[18];
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int ret;
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plat.handle = handle;
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plat.blkio = blkio;
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plat.device_path = malloc(device_path->length);
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if (!plat.device_path)
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return log_msg_ret("path", -ENOMEM);
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memcpy(plat.device_path, device_path, device_path->length);
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ret = device_bind(dm_root(), DM_DRIVER_GET(efi_media), "efi_media",
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&plat, ofnode_null(), &dev);
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if (ret)
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return log_msg_ret("bind", ret);
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snprintf(name, sizeof(name), "efi_media_%x", dev_seq(dev));
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device_set_name(dev, name);
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*devp = dev;
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return 0;
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}
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static efi_status_t setup_memory(struct efi_priv *priv)
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{
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struct efi_boot_services *boot = priv->boot;
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efi_physical_addr_t addr;
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efi_status_t ret;
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int pages;
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/*
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* Use global_data_ptr instead of gd since it is an assignment. There
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* are very few assignments to global_data in U-Boot and this makes
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* it easier to find them.
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*/
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global_data_ptr = efi_malloc(priv, sizeof(struct global_data), &ret);
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if (!global_data_ptr)
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return ret;
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memset(gd, '\0', sizeof(*gd));
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gd->malloc_base = (ulong)efi_malloc(priv, CONFIG_VAL(SYS_MALLOC_F_LEN),
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&ret);
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if (!gd->malloc_base)
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return ret;
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pages = CONFIG_EFI_RAM_SIZE >> 12;
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/*
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* Don't allocate any memory above 4GB. U-Boot is a 32-bit application
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* so we want it to load below 4GB.
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*/
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addr = 1ULL << 32;
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ret = boot->allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
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priv->image_data_type, pages, &addr);
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if (ret) {
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log_info("(using pool %lx) ", ret);
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priv->ram_base = (ulong)efi_malloc(priv, CONFIG_EFI_RAM_SIZE,
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&ret);
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if (!priv->ram_base)
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return ret;
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priv->use_pool_for_malloc = true;
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} else {
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log_info("(using allocated RAM address %lx) ", (ulong)addr);
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priv->ram_base = addr;
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}
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gd->ram_size = pages << 12;
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return 0;
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}
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/**
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* free_memory() - Free memory used by the U-Boot app
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*
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* This frees memory allocated in setup_memory(), in preparation for returning
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* to UEFI. It also zeroes the global_data pointer.
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*
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* @priv: Private EFI data
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*/
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static void free_memory(struct efi_priv *priv)
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{
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struct efi_boot_services *boot = priv->boot;
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if (priv->use_pool_for_malloc)
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efi_free(priv, (void *)priv->ram_base);
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else
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boot->free_pages(priv->ram_base, gd->ram_size >> 12);
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efi_free(priv, (void *)gd->malloc_base);
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efi_free(priv, gd);
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global_data_ptr = NULL;
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}
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/**
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* devpath_is_partition() - Figure out if a device path is a partition
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*
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* Checks if a device path refers to a partition on some media device. This
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* works by checking for a valid partition number in a hard-driver media device
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* as the final component of the device path.
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*
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* @path: device path
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* Return: true if a partition, false if not
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* (e.g. it might be media which contains partitions)
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*/
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static bool devpath_is_partition(const struct efi_device_path *path)
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{
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const struct efi_device_path *p;
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bool was_part = false;
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for (p = path; p->type != DEVICE_PATH_TYPE_END;
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p = (void *)p + p->length) {
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was_part = false;
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if (p->type == DEVICE_PATH_TYPE_MEDIA_DEVICE &&
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p->sub_type == DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH) {
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struct efi_device_path_hard_drive_path *hd =
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(void *)path;
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if (hd->partition_number)
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was_part = true;
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}
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}
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return was_part;
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}
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/**
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* setup_block() - Find all block devices and setup EFI devices for them
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*
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* Partitions are ignored, since U-Boot has partition handling. Errors with
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* particular devices produce a warning but execution continues to try to
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* find others.
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*
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* Return: 0 if found, -ENOSYS if there is no boot-services table, -ENOTSUPP
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* if a required protocol is not supported
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*/
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static int setup_block(void)
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{
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efi_guid_t efi_blkio_guid = EFI_BLOCK_IO_PROTOCOL_GUID;
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efi_guid_t efi_devpath_guid = EFI_DEVICE_PATH_PROTOCOL_GUID;
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efi_guid_t efi_pathutil_guid = EFI_DEVICE_PATH_UTILITIES_PROTOCOL_GUID;
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efi_guid_t efi_pathtext_guid = EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID;
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struct efi_boot_services *boot = efi_get_boot();
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struct efi_device_path_utilities_protocol *util;
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struct efi_device_path_to_text_protocol *text;
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struct efi_device_path *path;
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struct efi_block_io *blkio;
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efi_uintn_t num_handles;
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efi_handle_t *handle;
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int ret, i;
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if (!boot)
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return log_msg_ret("sys", -ENOSYS);
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/* Find all devices which support the block I/O protocol */
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ret = boot->locate_handle_buffer(BY_PROTOCOL, &efi_blkio_guid, NULL,
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&num_handles, &handle);
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if (ret)
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return log_msg_ret("loc", -ENOTSUPP);
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log_debug("Found %d handles:\n", (int)num_handles);
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/* We need to look up the path size and convert it to text */
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ret = boot->locate_protocol(&efi_pathutil_guid, NULL, (void **)&util);
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if (ret)
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return log_msg_ret("util", -ENOTSUPP);
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ret = boot->locate_protocol(&efi_pathtext_guid, NULL, (void **)&text);
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if (ret)
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return log_msg_ret("text", -ENOTSUPP);
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for (i = 0; i < num_handles; i++) {
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struct udevice *dev;
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const u16 *name;
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bool is_part;
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int len;
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ret = boot->handle_protocol(handle[i], &efi_devpath_guid,
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(void **)&path);
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if (ret) {
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log_warning("- devpath %d failed (ret=%d)\n", i, ret);
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continue;
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}
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ret = boot->handle_protocol(handle[i], &efi_blkio_guid,
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(void **)&blkio);
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if (ret) {
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log_warning("- blkio %d failed (ret=%d)\n", i, ret);
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continue;
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}
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name = text->convert_device_path_to_text(path, true, false);
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is_part = devpath_is_partition(path);
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if (!is_part) {
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len = util->get_device_path_size(path);
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ret = efi_bind_block(handle[i], blkio, path, len, &dev);
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if (ret) {
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log_warning("- blkio bind %d failed (ret=%d)\n",
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i, ret);
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continue;
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}
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} else {
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dev = NULL;
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}
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/*
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* Show the device name if we created one. Otherwise indicate
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* that it is a partition.
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*/
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printf("%2d: %-12s %ls\n", i, dev ? dev->name : "<partition>",
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name);
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}
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boot->free_pool(handle);
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return 0;
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}
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/**
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* dm_scan_other() - Scan for UEFI devices that should be available to U-Boot
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*
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* This sets up block devices within U-Boot for those found in UEFI. With this,
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* U-Boot can access those devices
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*
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* @pre_reloc_only: true to only bind pre-relocation devices (ignored)
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* Returns: 0 on success, -ve on error
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*/
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int dm_scan_other(bool pre_reloc_only)
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{
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if (gd->flags & GD_FLG_RELOC) {
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int ret;
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ret = setup_block();
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if (ret)
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return ret;
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}
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return 0;
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}
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/**
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* efi_main() - Start an EFI image
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*
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* This function is called by our EFI start-up code. It handles running
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* U-Boot. If it returns, EFI will continue. Another way to get back to EFI
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* is via reset_cpu().
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*/
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efi_status_t EFIAPI efi_main(efi_handle_t image,
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struct efi_system_table *sys_table)
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{
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struct efi_priv local_priv, *priv = &local_priv;
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efi_status_t ret;
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/* Set up access to EFI data structures */
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ret = efi_init(priv, "App", image, sys_table);
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if (ret) {
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printf("Failed to set up U-Boot: err=%lx\n", ret);
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return ret;
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}
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efi_set_priv(priv);
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/*
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* Set up the EFI debug UART so that printf() works. This is
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* implemented in the EFI serial driver, serial_efi.c. The application
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* can use printf() freely.
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*/
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debug_uart_init();
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ret = setup_memory(priv);
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if (ret) {
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printf("Failed to set up memory: ret=%lx\n", ret);
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return ret;
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}
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/*
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* We could store the EFI memory map here, but it changes all the time,
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* so this is only useful for debugging.
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*
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* ret = efi_store_memory_map(priv);
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* if (ret)
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* return ret;
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*/
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printf("starting\n");
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board_init_f(GD_FLG_SKIP_RELOC);
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board_init_r(NULL, 0);
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free_memory(priv);
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return EFI_SUCCESS;
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}
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static void efi_exit(void)
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{
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struct efi_priv *priv = efi_get_priv();
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free_memory(priv);
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printf("U-Boot EFI exiting\n");
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priv->boot->exit(priv->parent_image, EFI_SUCCESS, 0, NULL);
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}
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static int efi_sysreset_request(struct udevice *dev, enum sysreset_t type)
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{
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efi_exit();
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return -EINPROGRESS;
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}
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static const struct udevice_id efi_sysreset_ids[] = {
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{ .compatible = "efi,reset" },
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{ }
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};
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static struct sysreset_ops efi_sysreset_ops = {
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.request = efi_sysreset_request,
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};
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U_BOOT_DRIVER(efi_sysreset) = {
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.name = "efi-sysreset",
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.id = UCLASS_SYSRESET,
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.of_match = efi_sysreset_ids,
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.ops = &efi_sysreset_ops,
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};
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