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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <types.h>
#include <device/mmio.h>
#include <ramdetect.h>
#include <arch/exception.h>
#include <arch/transition.h>
static enum {
ABORT_CHECKER_NOT_TRIGGERED,
ABORT_CHECKER_TRIGGERED,
} abort_state = ABORT_CHECKER_NOT_TRIGGERED;
static int abort_checker(struct exc_state *state, uint64_t vector_id)
{
if (raw_read_esr() >> 26 != 0x25)
return EXC_RET_IGNORED; /* Not a data abort. */
abort_state = ABORT_CHECKER_TRIGGERED;
state->elx.elr += sizeof(uint32_t); /* Jump over faulting instruction. */
raw_write_elr(state->elx.elr);
return EXC_RET_HANDLED;
}
static struct exception_handler sync_el0 = {.handler = &abort_checker};
int probe_mb(const uintptr_t dram_start, const uintptr_t size)
{
uintptr_t addr = dram_start + (size * MiB) - sizeof(uint32_t);
void *ptr = (void *)addr;
abort_state = ABORT_CHECKER_NOT_TRIGGERED;
exception_handler_register(EXC_VID_CUR_SP_EL0_SYNC, &sync_el0);
read32(ptr);
exception_handler_unregister(EXC_VID_CUR_SP_EL0_SYNC, &sync_el0);
return abort_state == ABORT_CHECKER_NOT_TRIGGERED;
}
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