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efi_loader: Add mem-mapped for fallback

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When we don't have a real device/image path, such as 'bootefi hello',
construct a mem-mapped device-path.

This fixes 'bootefi hello' after devicepath refactoring.

Fixes: 95c5553ea2 ("efi_loader: refactor boot device and loaded_image handling")
Signed-off-by: Rob Clark <robdclark@gmail.com>
Acked-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Rob Clark 2017-10-10 08:23:06 -04:00 • committed by Alexander Graf
parent bcbc4a8046
commit bf19273e81
5 changed files with 67 additions and 0 deletions
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24
lib/efi_loader/efi_device_path.c
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@ -538,6 +538,30 @@ struct efi_device_path *efi_dp_from_eth(void)
}
#endif
/* Construct a device-path for memory-mapped image */
struct efi_device_path *efi_dp_from_mem(uint32_t memory_type,
uint64_t start_address,
uint64_t end_address)
{
struct efi_device_path_memory *mdp;
void *buf, *start;
start = buf = dp_alloc(sizeof(*mdp) + sizeof(END));
mdp = buf;
mdp->dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE;
mdp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MEMORY;
mdp->dp.length = sizeof(*mdp);
mdp->memory_type = memory_type;
mdp->start_address = start_address;
mdp->end_address = end_address;
buf = &mdp[1];
*((struct efi_device_path *)buf) = END;
return start;
}
/*
* Helper to split a full device path (containing both device and file
* parts) into it's constituent parts.