linux/drivers/firmware
Ard Biesheuvel 018edcfac4 efi/libstub: Make efi_random_alloc() allocate below 4 GB on 32-bit
The UEFI stub executes in the context of the firmware, which identity
maps the available system RAM, which implies that only memory below
4 GB can be used for allocations on 32-bit architectures, even on [L]PAE
capable hardware.

So ignore any reported memory above 4 GB in efi_random_alloc(). This
also fixes a reported build problem on ARM under -Os, where the 64-bit
logical shift relies on a software routine that the ARM decompressor does
not provide.

A second [minor] issue is also fixed, where the '+ 1' is moved out of
the shift, where it belongs: the reason for its presence is that a
memory region where start == end should count as a single slot, given
that 'end' takes the desired size and alignment of the allocation into
account.

To clarify the code in this regard, rename start/end to 'first_slot' and
'last_slot', respectively, and introduce 'region_end' to describe the
last usable address of the current region.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1480010543-25709-2-git-send-email-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-11-25 07:15:23 +01:00
..
broadcom tree-wide: replace config_enabled() with IS_ENABLED() 2016-08-04 08:50:07 -04:00
efi efi/libstub: Make efi_random_alloc() allocate below 4 GB on 32-bit 2016-11-25 07:15:23 +01:00
google firmware-gsmi: Delete an unnecessary check before the function call "dma_pool_destroy" 2016-09-09 16:08:45 +01:00
meson firmware: Amlogic: Add secure monitor driver 2016-09-01 14:23:39 -07:00
arm_scpi.c firmware: arm_scpi: add missing of_node_put after calling of_parse_phandle 2016-08-08 14:31:09 +01:00
dcdbas.c dcdbas: Make use of smp_call_on_cpu() 2016-09-05 13:52:40 +02:00
dcdbas.h
dell_rbu.c
dmi_scan.c
dmi-id.c dmi-id: don't free dev structure after calling device_register 2016-09-08 10:35:50 +02:00
dmi-sysfs.c
edd.c
iscsi_ibft_find.c
iscsi_ibft.c ibft: Expose iBFT acpi header via sysfs 2016-05-16 11:14:29 -04:00
Kconfig firmware: Amlogic: Add secure monitor driver 2016-09-01 14:23:39 -07:00
Makefile firmware: Amlogic: Add secure monitor driver 2016-09-01 14:23:39 -07:00
memmap.c
pcdp.c
pcdp.h
psci.c drivers: firmware: psci: initialise idle states using ACPI LPI 2016-07-21 23:29:38 +02:00
qcom_scm-32.c firmware: qcom: scm: Expose PAS command 10 as reset-controller 2016-06-24 22:53:52 -05:00
qcom_scm-64.c firmware: qcom: scm: Expose PAS command 10 as reset-controller 2016-06-24 22:53:52 -05:00
qcom_scm.c firmware: qcom_scm: make it explicitly non-modular 2016-08-23 15:46:32 -05:00
qcom_scm.h firmware: qcom: scm: Expose PAS command 10 as reset-controller 2016-06-24 22:53:52 -05:00
qemu_fw_cfg.c driver core update for 4.7-rc1 2016-05-20 21:26:15 -07:00
raspberrypi.c
scpi_pm_domain.c firmware: scpi: add device power domain support using genpd 2016-06-21 10:26:51 +01:00