lib: ramdetect: Register exception handlers for ARMv8
Register exception handlers to avoid a Synchronous External Abort that is raised when you try to access a non-memory address on ARMv8. An exception handler can jump over the faulting instruction. This is the feature only for QEMU/AArch64. Signed-off-by: Asami Doi <d0iasm.pub@gmail.com> Change-Id: I09a306ca307ba4027d9758c3debc2e7c844c66b8 Reviewed-on: https://review.coreboot.org/c/coreboot/+/34774 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Raul Rangel <rrangel@chromium.org>
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@ -107,6 +107,7 @@ romstage-$(CONFIG_ARM64_USE_ARCH_TIMER) += arch_timer.c
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romstage-y += memset.S
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romstage-y += memcpy.S
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romstage-y += memmove.S
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romstage-y += ramdetect.c
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romstage-y += romstage.c
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romstage-y += transition.c transition_asm.S
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@ -131,6 +132,7 @@ ramstage-y += div0.c
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ramstage-y += eabi_compat.c
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ramstage-y += boot.c
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ramstage-y += tables.c
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ramstage-y += ramdetect.c
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ramstage-$(CONFIG_ARM64_USE_ARCH_TIMER) += arch_timer.c
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ramstage-y += memset.S
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ramstage-y += memcpy.S
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@ -0,0 +1,41 @@
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/*
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* This file is part of the coreboot project.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include <types.h>
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#include <device/mmio.h>
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#include <ramdetect.h>
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#include <arch/exception.h>
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#include <arch/transition.h>
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static enum {
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ABORT_CHECKER_NOT_TRIGGERED,
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ABORT_CHECKER_TRIGGERED,
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} abort_state = ABORT_CHECKER_NOT_TRIGGERED;
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static int abort_checker(struct exc_state *state, uint64_t vector_id)
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{
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if (raw_read_esr_el3() >> 26 != 0x25)
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return EXC_RET_IGNORED; /* Not a data abort. */
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abort_state = ABORT_CHECKER_TRIGGERED;
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state->elx.elr += sizeof(uint32_t); /* Jump over faulting instruction. */
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raw_write_elr_el3(state->elx.elr);
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return EXC_RET_HANDLED;
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}
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static struct exception_handler sync_el0 = {.handler = &abort_checker};
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int probe_mb(const uintptr_t dram_start, const uintptr_t size)
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{
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uintptr_t addr = dram_start + (size * MiB) - sizeof(uint32_t);
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void *ptr = (void *)addr;
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abort_state = ABORT_CHECKER_NOT_TRIGGERED;
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exception_handler_register(EXC_VID_CUR_SP_EL0_SYNC, &sync_el0);
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read32(ptr);
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exception_handler_unregister(EXC_VID_CUR_SP_EL0_SYNC, &sync_el0);
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return abort_state == ABORT_CHECKER_NOT_TRIGGERED;
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}
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@ -11,6 +11,12 @@
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* GNU General Public License for more details.
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*/
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/*
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* Used in probe_ramsize(). This is a weak function and it's overridden for
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* ARMv8. Return 1 when DRAM exists at the address, otherwise return 0.
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*/
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int probe_mb(const uintptr_t dram_start, const uintptr_t size);
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/*
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* Probe an area if it's read/writable.
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* Primary use case is the detection of DRAM amount on emulators.
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@ -19,7 +19,7 @@
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#define OVERLAP(a, b, s, e) ((b) > (s) && (a) < (e))
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static int probe_mb(const uintptr_t dram_start, const uintptr_t size)
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int __weak probe_mb(const uintptr_t dram_start, const uintptr_t size)
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{
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uintptr_t addr = dram_start + (size * MiB) - sizeof(uint32_t);
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static const uint32_t patterns[] = {
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