riscv-spike: support for Spike emulation of riscv

Spike support: QEMU RISCV is broken, and the maintainers at Berkeley
are working on it, but at the moment spike is the only way to  test
on riscv. Add support for spike console output for debugging.

Privileged ISA: Update to privileged ISA in RISCV (machine,
supervisor, hypervisor, user modes) broke exisitng RISCV asm, and
bootblock.S was updated to match the new spec. Clean old assembly

[pg: things build with gcc 4.9 now, but don't expect them to work.
Hardcoding register names into the assembler language may not be the smartest
idea of the RISCV folks.]

Change-Id: Ie2c109d3c26712c207512f74f28ce1a925e6e181
Signed-off-by: Thaminda Edirisooriya <thaminda@google.com>
Reviewed-on: http://review.coreboot.org/11078
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 61 insertions, 0 deletions

diff --git a/src/mainboard/emulation/spike-riscv/Kconfig b/src/mainboard/emulation/spike-riscv/Kconfig
new file mode 100644
index 0000000000..7c7fb346a4
--- /dev/null
+++ b/src/mainboard/emulation/spike-riscv/Kconfig
@@ -0,0 +1,61 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2014 Google Inc.
+##
+## This software is licensed under the terms of the GNU General Public
+## License version 2, as published by the Free Software Foundation, and
+## may be copied, distributed, and modified under those terms.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+
+# To execute, do:
+# qemu-system-arm -M vexpress-a9 -m 1024M -nographic -kernel build/coreboot.rom
+
+if BOARD_EMULATION_SPIKE_UCB_RISCV
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+	select SOC_UCB_RISCV
+	select BOARD_ROMSIZE_KB_4096
+	select ARCH_BOOTBLOCK_RISCV
+	select HAVE_UART_SPECIAL
+
+config MAINBOARD_DIR
+	string
+	default emulation/spike-riscv
+
+config MAINBOARD_PART_NUMBER
+	string
+	default "SPIKE RISCV"
+
+config MAX_CPUS
+	int
+	default 1
+
+config MAINBOARD_VENDOR
+	string
+	default "UCB"
+
+config DRAM_SIZE_MB
+	int
+	default 32768
+
+# Memory map for qemu riscv
+#
+# 0x0000_0000: jump instruction (by qemu)
+# 0x0002_0000: bootblock (entry of kernel / firmware)
+# 0x0003_0000: romstage, assume up to 128KB in size.
+# 0x0007_ff00: stack pointer
+# 0x0010_0000: CBFS header
+# 0x0011_0000: CBFS data
+# 0x0100_0000: reserved for ramstage
+
+config RAMTOP
+	hex
+	default 0x1000000
+
+endif #  BOARD_EMULATION_SPIKE_UCB_RISCV