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1070f01ac1
Usually ARMv8 platforms allow unaligned access for Normal memory. But
some chips might not allow it by default, having SCTLR.A bit set to 1
before U-Boot execution. One such example is Exynos850 SoC. As
allow_unaligned() is not implemented for ARMv8 at the moment, its __weak
implementation is used, which does nothing. That might lead to unaligned
access abort, for example when running EFI selftest. Fix that by
implementing allow_unaligned() for ARMv8.
The issue was found when running EFI selftest on E850-96 board
(Exynos850 based):
=> bootefi selftest $fdtcontroladdr
...
Executing 'HII database protocols'
"Synchronous Abort" handler, esr 0x96000021, far 0xbaac0991
...
resetting ...
Unaligned abort happens in u16_strnlen(), which is called from
efi_hii_sibt_string_ucs2_block_next():
u16_strlen(blk->string_text)
where 'blk' type is struct efi_hii_sibt_string_ucs2_block. Because this
struct is packed, doing "->string_text" makes 'blk' address incremented
by 1 byte, which makes it unaligned. Although allow_unaligned() was
called in efi_init_early() before EFI selftest execution, it wasn't
implemented for ARMv8 CPUs, so data abort happened.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
101 lines
2 KiB
C
101 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2008 Texas Insturments
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* (C) Copyright 2002
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* Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
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*/
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#include <command.h>
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#include <cpu_func.h>
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#include <irq_func.h>
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#include <asm/cache.h>
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#include <asm/system.h>
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#include <asm/secure.h>
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#include <linux/compiler.h>
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/*
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* sdelay() - simple spin loop.
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*
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* Will delay execution by roughly (@loops * 2) cycles.
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* This is necessary to be used before timers are accessible.
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*
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* A value of "0" will results in 2^64 loops.
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*/
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void sdelay(unsigned long loops)
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{
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__asm__ volatile ("1:\n" "subs %0, %0, #1\n"
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"b.ne 1b" : "=r" (loops) : "0"(loops) : "cc");
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}
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void __weak board_cleanup_before_linux(void){}
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int cleanup_before_linux(void)
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{
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/*
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* this function is called just before we call linux
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* it prepares the processor for linux
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*
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* disable interrupt and turn off caches etc ...
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*/
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board_cleanup_before_linux();
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disable_interrupts();
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if (IS_ENABLED(CONFIG_CMO_BY_VA_ONLY)) {
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/*
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* Disable D-cache.
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*/
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dcache_disable();
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} else {
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/*
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* Turn off I-cache and invalidate it
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*/
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icache_disable();
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invalidate_icache_all();
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/*
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* turn off D-cache
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* dcache_disable() in turn flushes the d-cache and disables
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* MMU
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*/
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dcache_disable();
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invalidate_dcache_all();
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}
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return 0;
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}
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#ifdef CONFIG_ARMV8_PSCI
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static void relocate_secure_section(void)
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{
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#ifdef CONFIG_ARMV8_SECURE_BASE
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size_t sz = __secure_end - __secure_start;
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memcpy((void *)CONFIG_ARMV8_SECURE_BASE, __secure_start, sz);
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flush_dcache_range(CONFIG_ARMV8_SECURE_BASE,
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CONFIG_ARMV8_SECURE_BASE + sz + 1);
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invalidate_icache_all();
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#endif
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}
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void armv8_setup_psci(void)
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{
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if (current_el() != 3)
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return;
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relocate_secure_section();
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secure_ram_addr(psci_setup_vectors)();
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secure_ram_addr(psci_arch_init)();
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}
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#endif
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void allow_unaligned(void)
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{
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set_sctlr(get_sctlr() & ~CR_A);
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}
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