Merge remote-tracking branch 'remotes/alistair/tags/pull-riscv-to-apply-20200713' into staging

This is a colection of bug fixes and small imrprovements for RISC-V.

This includes some vector extensions fixes, a PMP bug fix, OpenTitan
UART bug fix and support for OpenSBI dynamic firmware.

# gpg: Signature made Tue 14 Jul 2020 01:29:44 BST
# gpg:                using RSA key F6C4AC46D4934868D3B8CE8F21E10D29DF977054
# gpg: Good signature from "Alistair Francis <alistair@alistair23.me>" [full]
# Primary key fingerprint: F6C4 AC46 D493 4868 D3B8  CE8F 21E1 0D29 DF97 7054

* remotes/alistair/tags/pull-riscv-to-apply-20200713:
  target/riscv: Fix pmp NA4 implementation
  tcg/riscv: Remove superfluous breaks
  hw/char: Convert the Ibex UART to use the registerfields API
  hw/char: Convert the Ibex UART to use the qdev Clock model
  target/riscv: fix vill bit index in vtype register
  target/riscv: fix return value of do_opivx_widen()
  target/riscv: correct the gvec IR called in gen_vec_rsub16_i64()
  target/riscv: fix rsub gvec tcg_assert_listed_vecop assertion
  hw/riscv: Modify MROM size to end at 0x10000
  RISC-V: Support 64 bit start address
  riscv: Add opensbi firmware dynamic support
  RISC-V: Copy the fdt in dram instead of ROM
  riscv: Unify Qemu's reset vector code path
  hw/riscv: virt: Sort the SoC memmap table entries
  MAINTAINERS: Add an entry for OpenSBI firmware

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 58 insertions, 0 deletions

diff --git a/include/hw/riscv/boot_opensbi.h b/include/hw/riscv/boot_opensbi.h
new file mode 100644
index 0000000000..0d5ddd6c3d
--- /dev/null
+++ b/include/hw/riscv/boot_opensbi.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (c) 2019 Western Digital Corporation or its affiliates.
+ *
+ * Based on include/sbi/{fw_dynamic.h,sbi_scratch.h} from the OpenSBI project.
+ */
+#ifndef OPENSBI_H
+#define OPENSBI_H
+
+/** Expected value of info magic ('OSBI' ascii string in hex) */
+#define FW_DYNAMIC_INFO_MAGIC_VALUE     0x4942534f
+
+/** Maximum supported info version */
+#define FW_DYNAMIC_INFO_VERSION         0x2
+
+/** Possible next mode values */
+#define FW_DYNAMIC_INFO_NEXT_MODE_U     0x0
+#define FW_DYNAMIC_INFO_NEXT_MODE_S     0x1
+#define FW_DYNAMIC_INFO_NEXT_MODE_M     0x3
+
+enum sbi_scratch_options {
+    /** Disable prints during boot */
+    SBI_SCRATCH_NO_BOOT_PRINTS = (1 << 0),
+    /** Enable runtime debug prints */
+    SBI_SCRATCH_DEBUG_PRINTS = (1 << 1),
+};
+
+/** Representation dynamic info passed by previous booting stage */
+struct fw_dynamic_info {
+    /** Info magic */
+    target_long magic;
+    /** Info version */
+    target_long version;
+    /** Next booting stage address */
+    target_long next_addr;
+    /** Next booting stage mode */
+    target_long next_mode;
+    /** Options for OpenSBI library */
+    target_long options;
+    /**
+     * Preferred boot HART id
+     *
+     * It is possible that the previous booting stage uses same link
+     * address as the FW_DYNAMIC firmware. In this case, the relocation
+     * lottery mechanism can potentially overwrite the previous booting
+     * stage while other HARTs are still running in the previous booting
+     * stage leading to boot-time crash. To avoid this boot-time crash,
+     * the previous booting stage can specify last HART that will jump
+     * to the FW_DYNAMIC firmware as the preferred boot HART.
+     *
+     * To avoid specifying a preferred boot HART, the previous booting
+     * stage can set it to -1UL which will force the FW_DYNAMIC firmware
+     * to use the relocation lottery mechanism.
+     */
+    target_long boot_hart;
+};
+
+#endif