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efi_loader: add file/filesys support

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fallback.efi (and probably other things) use UEFI's simple-file-system
protocol and file support to search for OS's to boot.

Signed-off-by: Rob Clark <robdclark@gmail.com>
[agraf: whitespace fixes, unsigned fixes]
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Rob Clark 2017-09-13 18:05:34 -04:00 • committed by Alexander Graf
parent 95c5553ea2
commit 2a92080d8c
7 changed files with 676 additions and 0 deletions
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32
lib/efi_loader/efi_disk.c
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@ -31,6 +31,8 @@ struct efi_disk_obj {
struct efi_device_path *dp;
/* partition # */
unsigned int part;
/* handle to filesys proto (for partition objects) */
struct efi_simple_file_system_protocol *volume;
/* Offset into disk for simple partitions */
lbaint_t offset;
/* Internal block device */
@ -172,6 +174,28 @@ static const struct efi_block_io block_io_disk_template = {
.flush_blocks = &efi_disk_flush_blocks,
};
/*
* Find filesystem from a device-path. The passed in path 'p' probably
* contains one or more /File(name) nodes, so the comparison stops at
* the first /File() node, and returns the pointer to that via 'rp'.
* This is mostly intended to be a helper to map a device-path to an
* efi_file_handle object.
*/
struct efi_simple_file_system_protocol *
efi_fs_from_path(struct efi_device_path *fp)
{
struct efi_object *efiobj;
struct efi_disk_obj *diskobj;
efiobj = efi_dp_find_obj(fp, NULL);
if (!efiobj)
return NULL;
diskobj = container_of(efiobj, struct efi_disk_obj, parent);
return diskobj->volume;
}
static void efi_disk_add_dev(const char *name,
const char *if_typename,
struct blk_desc *desc,
@ -194,6 +218,14 @@ static void efi_disk_add_dev(const char *name,
diskobj->parent.protocols[0].protocol_interface = &diskobj->ops;
diskobj->parent.protocols[1].guid = &efi_guid_device_path;
diskobj->parent.protocols[1].protocol_interface = diskobj->dp;
if (part >= 1) {
diskobj->volume = efi_simple_file_system(desc, part,
diskobj->dp);
diskobj->parent.protocols[2].guid =
&efi_simple_file_system_protocol_guid;
diskobj->parent.protocols[2].protocol_interface =
diskobj->volume;
}
diskobj->parent.handle = diskobj;
diskobj->ops = block_io_disk_template;
diskobj->ifname = if_typename;