bd67b711bf
BMIPS is one of the few platforms that do change the exception base.
After commit 2dcb39645441 ("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: 2dcb39645441 ("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>
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Trap handling definitions.
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*
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* Copyright (C) 2002, 2003 Maciej W. Rozycki
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*/
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#ifndef _ASM_TRAPS_H
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#define _ASM_TRAPS_H
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/*
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* Possible status responses for a board_be_handler backend.
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*/
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#define MIPS_BE_DISCARD 0 /* return with no action */
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#define MIPS_BE_FIXUP 1 /* return to the fixup code */
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#define MIPS_BE_FATAL 2 /* treat as an unrecoverable error */
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extern void (*board_be_init)(void);
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extern int (*board_be_handler)(struct pt_regs *regs, int is_fixup);
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extern void (*board_nmi_handler_setup)(void);
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extern void (*board_ejtag_handler_setup)(void);
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extern void (*board_bind_eic_interrupt)(int irq, int regset);
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extern void (*board_ebase_setup)(void);
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extern void (*board_cache_error_setup)(void);
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extern int register_nmi_notifier(struct notifier_block *nb);
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extern void reserve_exception_space(phys_addr_t addr, unsigned long size);
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extern char except_vec_nmi[];
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#define VECTORSPACING 0x100 /* for EI/VI mode */
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#define nmi_notifier(fn, pri) \
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({ \
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static struct notifier_block fn##_nb = { \
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.notifier_call = fn, \
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.priority = pri \
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}; \
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\
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register_nmi_notifier(&fn##_nb); \
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})
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#endif /* _ASM_TRAPS_H */
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