OpenCloudOS-Kernel/arch/mips
Thomas Bogendoerfer bd67b711bf MIPS: kernel: Reserve exception base early to prevent corruption
BMIPS is one of the few platforms that do change the exception base.
After commit 2dcb396454 ("memblock: do not start bottom-up allocations
with kernel_end") we started seeing BMIPS boards fail to boot with the
built-in FDT being corrupted.

Before the cited commit, early allocations would be in the [kernel_end,
RAM_END] range, but after commit they would be within [RAM_START +
PAGE_SIZE, RAM_END].

The custom exception base handler that is installed by
bmips_ebase_setup() done for BMIPS5000 CPUs ends-up trampling on the
memory region allocated by unflatten_and_copy_device_tree() thus
corrupting the FDT used by the kernel.

To fix this, we need to perform an early reservation of the custom
exception space. Additional we reserve the first 4k (1k for R3k) for
either normal exception vector space (legacy CPUs) or special vectors
like cache exceptions.

Huge thanks to Serge for analysing and proposing a solution to this
issue.

Fixes: 2dcb396454 ("memblock: do not start bottom-up allocations with kernel_end")
Reported-by: Kamal Dasu <kdasu.kdev@gmail.com>
Debugged-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2021-03-09 11:22:59 +01:00
..
alchemy driver core: lift dma_default_coherent into common code 2021-02-13 09:51:45 +01:00
ar7 MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
ath25 MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
ath79 MIPS: of: Introduce helper function to get DTB 2021-02-04 13:34:51 +01:00
bcm47xx MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
bcm63xx MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
bmips mips: bmips: init clocks earlier 2021-02-23 13:23:35 +01:00
boot MIPS: boot/compressed: Copy DTB to aligned address 2021-03-08 11:49:47 +01:00
cavium-octeon - added support for Nintendo N64 2021-02-21 13:18:26 -08:00
cobalt MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
configs Modules updates for v5.12 2021-02-23 10:15:33 -08:00
crypto crypto: mips/poly1305 - enable for all MIPS processors 2021-03-08 11:52:17 +01:00
dec MIPS: DEC: Restore bootmem reservation for firmware working memory area 2020-10-14 23:57:57 +02:00
fw MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
generic MIPS: of: Introduce helper function to get DTB 2021-02-04 13:34:51 +01:00
include MIPS: kernel: Reserve exception base early to prevent corruption 2021-03-09 11:22:59 +01:00
ingenic MIPS: jz4740: Rename jz4740 folders to ingenic 2020-09-18 16:35:05 +02:00
jazz MIPS: jazz: always allow little-endian builds 2021-01-22 13:53:21 +01:00
kernel MIPS: kernel: Reserve exception base early to prevent corruption 2021-03-09 11:22:59 +01:00
kvm KVM: MIPS: remove unneeded semicolon 2021-02-03 11:33:16 +01:00
lantiq MIPS: of: Introduce helper function to get DTB 2021-02-04 13:34:51 +01:00
lib arch: mips: update references to current linux-mips list 2021-02-23 13:24:38 +01:00
loongson2ef - added support for Nintendo N64 2021-02-21 13:18:26 -08:00
loongson32 MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
loongson64 Kbuild updates for v5.12 2021-02-25 10:17:31 -08:00
math-emu MIPS: Use fallthrough for arch/mips 2020-05-07 11:55:47 +02:00
mm MIPS: make userspace mapping young by default 2021-02-26 09:41:05 -08:00
mti-malta driver core: lift dma_default_coherent into common code 2021-02-13 09:51:45 +01:00
n64 mips: Add N64 machine type 2021-01-22 11:40:00 +01:00
net bpf: Rename BPF_XADD and prepare to encode other atomics in .imm 2021-01-14 18:34:29 -08:00
netlogic MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
pci driver core: lift dma_default_coherent into common code 2021-02-13 09:51:45 +01:00
pic32 MIPS: of: Introduce helper function to get DTB 2021-02-04 13:34:51 +01:00
pistachio driver core: lift dma_default_coherent into common code 2021-02-13 09:51:45 +01:00
power mips: check for dsp presence only once before save/restore 2019-10-07 10:58:53 -07:00
ralink MIPS: ralink: manage low reset lines 2021-02-04 13:35:01 +01:00
rb532 MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
sgi-ip22 MIPS: Only include the platform file needed 2020-05-13 00:17:18 +02:00
sgi-ip27 MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
sgi-ip30 MIPS: SGI-IP30: Move irq bits to better header files 2020-09-21 22:15:49 +02:00
sgi-ip32 arch: mips: update references to current linux-mips list 2021-02-23 13:24:38 +01:00
sibyte MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
sni MIPS: SNI: Fix spurious interrupts 2020-09-16 22:40:58 +02:00
tools MIPS: tools: Fix resource leak in elf-entry.c 2020-05-24 09:29:48 +02:00
txx9 MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
vdso Kbuild updates for v5.12 2021-02-25 10:17:31 -08:00
vr41xx MIPS: Remove empty prom_free_prom_memory functions 2021-01-07 17:11:33 +01:00
Kbuild MIPS: Fix "make clean" error due to recent changes 2020-05-13 13:20:22 +02:00
Kbuild.platforms mips: Add N64 machine type 2021-01-22 11:40:00 +01:00
Kconfig - added support for Nintendo N64 2021-02-21 13:18:26 -08:00
Kconfig.debug mips: Add CPS_NS16550_WIDTH config 2020-05-22 09:12:52 +02:00
Makefile - added support for Nintendo N64 2021-02-21 13:18:26 -08:00
Makefile.postlink MIPS: fix indentation of the 'RELOCS' message 2020-01-20 15:37:30 -08:00