riscv-openocd/tcl/cpu/arc/common.tcl

#  Copyright (C) 2015, 2020 Synopsys, Inc.
#  Anton Kolesov <anton.kolesov@synopsys.com>
#  Didin Evgeniy <didin@synopsys.com>
#
# SPDX-License-Identifier: GPL-2.0-or-later

# Things common to all ARCs

# It is assumed that target is already halted.
proc arc_common_reset { {target ""} } {
        if { $target != "" } {
                targets $target
        }

        halt

        # 1. Interrupts are disabled (STATUS32.IE)
        # 2. The status register flags are cleared.
        # All fields, except the H bit, are set to 0 when the processor is Reset.

        arc jtag set-aux-reg 0xA 0x1

        # 3. The loop count, loop start, and loop end registers are cleared.
        arc jtag set-core-reg 60 0
        arc jtag set-aux-reg 0x2 0
        arc jtag set-aux-reg 0x3 0

        # Program execution begins at the address referenced by the four byte reset
        # vector located at the interrupt vector base address, which is the first
        # entry (offset 0x00) in the vector table.
        set int_vector_base [arc jtag get-aux-reg 0x25]
        set start_pc [read_memory $int_vector_base 32 1]
        arc jtag set-aux-reg 0x6 $start_pc

        # It is OK to do uncached writes - register cache will be invalidated by
        # the reset_assert() function.
}

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