u-boot.git/lib/efi_loader, branch v2016.05

efi_loader: Handle memory overflows

2016-04-18T21:11:44+00:00

jetson-tk1 has 2 GB of RAM at 0x80000000, causing gd->ram_top to be zero.
Handle this by either avoiding ram_top or by using the same type as
ram_top to reverse the overflow effect.

Cc: Alexander Graf 
Signed-off-by: Andreas Färber 
Reviewed-by: Alexander Graf

efi_loader: Expose ascending efi memory map

2016-04-18T21:11:40+00:00

The EFI memory map does not need to be in a strict order, but 32bit
grub2 does expect it to be ascending. If it's not, it may try to
allocate memory inside the U-Boot data memory region.

We already sort the memory map in descending order, so let's just
reverse it when we pass it to a payload.

Signed-off-by: Alexander Graf 
Tested-by: Andreas Färber

efi_loader: Always flush in cache line size granularity

2016-04-18T21:11:39+00:00

The cache line flush helpers only work properly when they get aligned
start and end addresses. Round our flush range to cache line size. It's
safe because we're guaranteed to flush within a single page which has the
same cache attributes.

Reported-by: Marek Vasut 
Signed-off-by: Alexander Graf 
Reviewed-by: Andreas Färber 
Tested-by: Andreas Färber

efi_loader: Increase path string to 32 characters

2016-04-18T21:11:37+00:00

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

efi_loader: Add el torito support

2016-04-18T21:11:36+00:00

When loading an el torito image, uEFI exposes said image as a raw
block device to the payload.

Let's do the same by creating new block devices with added offsets for
the respective el torito partitions.

Signed-off-by: Alexander Graf

efi_loader: Split drive add into function

2016-04-18T21:11:35+00:00

The snippet of code to add a drive to our drive list needs to
get called from 2 places in the future. Split it into a separate
function.

Signed-off-by: Alexander Graf

efi_loader: Always allocate the highest available address

2016-04-01T21:18:06+00:00

Some EFI applications (grub2) expect that an allocation always returns
the highest available memory address for the given size.

Without this, we may run into situations where the initrd gets allocated
at a lower address than the kernel.

This patch fixes booting in such situations for me.

Signed-off-by: Alexander Graf

efi_loader: Fix some entry/exit points

2016-03-27T13:13:02+00:00

When switching between EFI context and U-Boot context we need to swap
the register that "gd" resides in.

Some functions slipped through here, with efi_allocate_pool / efi_free_pool
not doing the switch correctly and efi_return_handle switching too often.

Fix them all up to make sure we always have consistent register state.

Signed-off-by: Alexander Graf

efi_loader: Add GOP support

2016-03-27T13:12:12+00:00

The EFI standard defines a simple boot protocol that an EFI payload can use
to access video output.

This patch adds support to expose exactly that one (and the mode already in
use) as possible graphical configuration to an EFI payload.

With this, I can successfully run grub2 with graphical output.

Signed-off-by: Alexander Graf

efi_loader: Pass proper device path in on boot

2016-03-16T01:30:14+00:00

EFI payloads can query for the device they were booted from. Because
we have a disconnect between loading binaries and running binaries,
we passed in a dummy device path so far.

Unfortunately that breaks grub2's logic to find its configuration
file from the same device it was booted from.

This patch adds logic to have the "load" command call into our efi
code to set the device path to the one we last loaded a binary from.

With this grub2 properly detects where we got booted from and can
find its configuration file, even when searching by-partition.

Signed-off-by: Alexander Graf