mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-31 06:18:51 +09:00
![Alexander Graf](/assets/img/avatar_default.png)
Whenever we want to tell our payload about a path, we limit ourselves to a reasonable amount of characters. So far we only passed in device names - exceeding 16 chars was unlikely there. However by now we also pass real file path information, so let's increase the limit to 32 characters. That way common paths like "boot/efi/bootaa64.efi" fit just fine. Signed-off-by: Alexander Graf <agraf@suse.de>
258 lines
6.8 KiB
C
258 lines
6.8 KiB
C
/*
|
|
* 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;
|
|
/* Offset into disk for simple partitions */
|
|
lbaint_t offset;
|
|
};
|
|
|
|
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;
|
|
lba += diskobj->offset;
|
|
|
|
#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,
|
|
};
|
|
|
|
static void efi_disk_add_dev(char *name,
|
|
const struct block_drvr *cur_drvr,
|
|
const struct blk_desc *desc,
|
|
int dev_index,
|
|
lbaint_t offset)
|
|
{
|
|
struct efi_disk_obj *diskobj;
|
|
struct efi_device_path_file_path *dp;
|
|
int objlen = sizeof(*diskobj) + (sizeof(*dp) * 2);
|
|
|
|
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 = dev_index;
|
|
diskobj->offset = offset;
|
|
|
|
/* 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);
|
|
ascii2unicode(dp[0].str, name);
|
|
|
|
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);
|
|
}
|
|
|
|
static int efi_disk_create_eltorito(struct blk_desc *desc,
|
|
const struct block_drvr *cur_drvr,
|
|
int diskid)
|
|
{
|
|
int disks = 0;
|
|
#ifdef CONFIG_ISO_PARTITION
|
|
char devname[32] = { 0 }; /* dp->str is u16[32] long */
|
|
disk_partition_t info;
|
|
int part = 1;
|
|
|
|
if (desc->part_type != PART_TYPE_ISO)
|
|
return 0;
|
|
|
|
while (!part_get_info(desc, part, &info)) {
|
|
snprintf(devname, sizeof(devname), "%s%d:%d", cur_drvr->name,
|
|
diskid, part);
|
|
efi_disk_add_dev(devname, cur_drvr, desc, diskid, info.start);
|
|
part++;
|
|
disks++;
|
|
}
|
|
#endif
|
|
|
|
return disks;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
char devname[32] = { 0 }; /* dp->str is u16[32] long */
|
|
|
|
desc = blk_get_dev(cur_drvr->name, i);
|
|
if (!desc)
|
|
continue;
|
|
if (desc->type == DEV_TYPE_UNKNOWN)
|
|
continue;
|
|
|
|
snprintf(devname, sizeof(devname), "%s%d",
|
|
cur_drvr->name, i);
|
|
efi_disk_add_dev(devname, cur_drvr, desc, i, 0);
|
|
disks++;
|
|
|
|
/*
|
|
* El Torito images show up as block devices
|
|
* in an EFI world, so let's create them here
|
|
*/
|
|
disks += efi_disk_create_eltorito(desc, cur_drvr, i);
|
|
}
|
|
}
|
|
printf("Found %d disks\n", disks);
|
|
|
|
return 0;
|
|
}
|