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/*
* EFI application disk support
*
* Copyright (c) 2016 Alexander Graf
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <efi_loader.h>
#include <inttypes.h>
#include <part.h>
#include <malloc.h>
static const efi_guid_t efi_block_io_guid = BLOCK_IO_GUID;
struct efi_disk_obj {
/* Generic EFI object parent class data */
struct efi_object parent;
/* EFI Interface callback struct for block I/O */
struct efi_block_io ops;
/* U-Boot ifname for block device */
const char *ifname;
/* U-Boot dev_index for block device */
int dev_index;
/* EFI Interface Media descriptor struct, referenced by ops */
struct efi_block_io_media media;
/* EFI device path to this block device */
struct efi_device_path_file_path *dp;
};
static efi_status_t efi_disk_open_block(void *handle, efi_guid_t *protocol,
void **protocol_interface, void *agent_handle,
void *controller_handle, uint32_t attributes)
{
struct efi_disk_obj *diskobj = handle;
*protocol_interface = &diskobj->ops;
return EFI_SUCCESS;
}
static efi_status_t efi_disk_open_dp(void *handle, efi_guid_t *protocol,
void **protocol_interface, void *agent_handle,
void *controller_handle, uint32_t attributes)
{
struct efi_disk_obj *diskobj = handle;
*protocol_interface = diskobj->dp;
return EFI_SUCCESS;
}
static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this,
char extended_verification)
{
EFI_ENTRY("%p, %x", this, extended_verification);
return EFI_EXIT(EFI_DEVICE_ERROR);
}
enum efi_disk_direction {
EFI_DISK_READ,
EFI_DISK_WRITE,
};
static efi_status_t EFIAPI efi_disk_rw_blocks(struct efi_block_io *this,
u32 media_id, u64 lba, unsigned long buffer_size,
void *buffer, enum efi_disk_direction direction)
{
struct efi_disk_obj *diskobj;
struct blk_desc *desc;
int blksz;
int blocks;
unsigned long n;
EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba,
buffer_size, buffer);
diskobj = container_of(this, struct efi_disk_obj, ops);
if (!(desc = blk_get_dev(diskobj->ifname, diskobj->dev_index)))
return EFI_EXIT(EFI_DEVICE_ERROR);
blksz = desc->blksz;
blocks = buffer_size / blksz;
#ifdef DEBUG_EFI
printf("EFI: %s:%d blocks=%x lba=%"PRIx64" blksz=%x dir=%d\n", __func__,
__LINE__, blocks, lba, blksz, direction);
#endif
/* We only support full block access */
if (buffer_size & (blksz - 1))
return EFI_EXIT(EFI_DEVICE_ERROR);
if (direction == EFI_DISK_READ)
n = desc->block_read(desc, lba, blocks, buffer);
else
n = desc->block_write(desc, lba, blocks, buffer);
/* We don't do interrupts, so check for timers cooperatively */
efi_timer_check();
#ifdef DEBUG_EFI
printf("EFI: %s:%d n=%lx blocks=%x\n", __func__, __LINE__, n, blocks);
#endif
if (n != blocks)
return EFI_EXIT(EFI_DEVICE_ERROR);
return EFI_EXIT(EFI_SUCCESS);
}
static efi_status_t efi_disk_read_blocks(struct efi_block_io *this,
u32 media_id, u64 lba, unsigned long buffer_size,
void *buffer)
{
return efi_disk_rw_blocks(this, media_id, lba, buffer_size, buffer,
EFI_DISK_READ);
}
static efi_status_t efi_disk_write_blocks(struct efi_block_io *this,
u32 media_id, u64 lba, unsigned long buffer_size,
void *buffer)
{
return efi_disk_rw_blocks(this, media_id, lba, buffer_size, buffer,
EFI_DISK_WRITE);
}
static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this)
{
/* We always write synchronously */
EFI_ENTRY("%p", this);
return EFI_EXIT(EFI_SUCCESS);
}
static const struct efi_block_io block_io_disk_template = {
.reset = &efi_disk_reset,
.read_blocks = &efi_disk_read_blocks,
.write_blocks = &efi_disk_write_blocks,
.flush_blocks = &efi_disk_flush_blocks,
};
/*
* U-Boot doesn't have a list of all online disk devices. So when running our
* EFI payload, we scan through all of the potentially available ones and
* store them in our object pool.
*
* This gets called from do_bootefi_exec().
*/
int efi_disk_register(void)
{
const struct block_drvr *cur_drvr;
int i;
int disks = 0;
/* Search for all available disk devices */
for (cur_drvr = block_drvr; cur_drvr->name; cur_drvr++) {
printf("Scanning disks on %s...\n", cur_drvr->name);
for (i = 0; i < 4; i++) {
struct blk_desc *desc;
struct efi_disk_obj *diskobj;
struct efi_device_path_file_path *dp;
int objlen = sizeof(*diskobj) + (sizeof(*dp) * 2);
char devname[16] = { 0 }; /* dp->str is u16[16] long */
desc = blk_get_dev(cur_drvr->name, i);
if (!desc)
continue;
if (desc->type == DEV_TYPE_UNKNOWN)
continue;
diskobj = calloc(1, objlen);
/* Fill in object data */
diskobj->parent.protocols[0].guid = &efi_block_io_guid;
diskobj->parent.protocols[0].open = efi_disk_open_block;
diskobj->parent.protocols[1].guid = &efi_guid_device_path;
diskobj->parent.protocols[1].open = efi_disk_open_dp;
diskobj->parent.handle = diskobj;
diskobj->ops = block_io_disk_template;
diskobj->ifname = cur_drvr->name;
diskobj->dev_index = i;
/* Fill in EFI IO Media info (for read/write callbacks) */
diskobj->media.removable_media = desc->removable;
diskobj->media.media_present = 1;
diskobj->media.block_size = desc->blksz;
diskobj->media.io_align = desc->blksz;
diskobj->media.last_block = desc->lba;
diskobj->ops.media = &diskobj->media;
/* Fill in device path */
dp = (void*)&diskobj[1];
diskobj->dp = dp;
dp[0].dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE;
dp[0].dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH;
dp[0].dp.length = sizeof(*dp);
snprintf(devname, sizeof(devname), "%s%d",
cur_drvr->name, i);
ascii2unicode(dp[0].str, devname);
dp[1].dp.type = DEVICE_PATH_TYPE_END;
dp[1].dp.sub_type = DEVICE_PATH_SUB_TYPE_END;
dp[1].dp.length = sizeof(*dp);
/* Hook up to the device list */
list_add_tail(&diskobj->parent.link, &efi_obj_list);
disks++;
}
}
printf("Found %d disks\n", disks);
return 0;
}
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