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2019-03-19RISC-V: Update load reservation comment in do_interruptMichael Clark
Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Alistair Francis <Alistair.Francis@wdc.com> Signed-off-by: Michael Clark <mjc@sifive.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-03-19RISC-V: Convert trap debugging to trace eventsMichael Clark
Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Alistair Francis <Alistair.Francis@wdc.com> Signed-off-by: Michael Clark <mjc@sifive.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-03-19RISC-V: Add support for vectored interruptsMichael Clark
If vectored interrupts are enabled (bits[1:0] of mtvec/stvec == 1) then use the following logic for trap entry address calculation: pc = mtvec + cause * 4 In addition to adding support for vectored interrupts this patch simplifies the interrupt delivery logic by making sync/async cause decoding and encoding steps distinct. The cause code and the sign bit indicating sync/async is split at the beginning of the function and fixed cause is renamed to cause. The MSB setting for async traps is delayed until setting mcause/scause to allow redundant variables to be eliminated. Some variables are renamed for conciseness and moved so that decls are at the start of the block. Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Alistair Francis <Alistair.Francis@wdc.com> Signed-off-by: Michael Clark <mjc@sifive.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-03-19RISC-V: Change local interrupts from edge to levelMichael Clark
This effectively changes riscv_cpu_update_mip from edge to level. i.e. cpu_interrupt or cpu_reset_interrupt are called regardless of the current interrupt level. Fixes WFI doesn't return when a IPI is issued: - https://github.com/riscv/riscv-qemu/issues/132 To test: 1) Apply RISC-V Linux CPU hotplug patch: - http://lists.infradead.org/pipermail/linux-riscv/2018-May/000603.html 2) Enable CONFIG_CPU_HOTPLUG in linux .config 3) Try to offline and online cpus: echo 1 > /sys/devices/system/cpu/cpu2/online echo 0 > /sys/devices/system/cpu/cpu2/online echo 1 > /sys/devices/system/cpu/cpu2/online Reported-by: Atish Patra <atishp04@gmail.com> Cc: Atish Patra <atishp04@gmail.com> Cc: Alistair Francis <Alistair.Francis@wdc.com> Signed-off-by: Michael Clark <mjc@sifive.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-03-19RISC-V: linux-user support for RVE ABIKito Cheng
This change checks elf_flags for EF_RISCV_RVE and if present uses the RVE linux syscall ABI which uses t0 for the syscall number instead of a7. Warn and exit if a non-RVE ABI binary is run on a cpu with the RVE extension as it is incompatible. Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Sagar Karandikar <sagark@eecs.berkeley.edu> Cc: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Cc: Alistair Francis <Alistair.Francis@wdc.com> Co-authored-by: Kito Cheng <kito.cheng@gmail.com> Co-authored-by: Michael Clark <mjc@sifive.com> Signed-off-by: Michael Clark <mjc@sifive.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-03-19RISC-V: Allow interrupt controllers to claim interruptsMichael Clark
We can't allow the supervisor to control SEIP as this would allow the supervisor to clear a pending external interrupt which will result in lost a interrupt in the case a PLIC is attached. The SEIP bit must be hardware controlled when a PLIC is attached. This logic was previously hard-coded so SEIP was always masked even if no PLIC was attached. This patch adds riscv_cpu_claim_interrupts so that the PLIC can register control of SEIP. In the case of models without a PLIC (spike), the SEIP bit remains software controlled. This interface allows for hardware control of supervisor timer and software interrupts by other interrupt controller models. Cc: Palmer Dabbelt <palmer@sifive.com> Cc: Sagar Karandikar <sagark@eecs.berkeley.edu> Cc: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Cc: Alistair Francis <Alistair.Francis@wdc.com> Signed-off-by: Michael Clark <mjc@sifive.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-03-19riscv: pmp: Log pmp access errors as guest errorsAlistair Francis
Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-03-19RISC-V: Add hooks to use the gdb xml files.Jim Wilson
The gdb CSR xml file has registers in documentation order, not numerical order, so we need a table to map the register numbers. This also adds fairly standard gdb hooks to access xml specified registers. notice: The fpu xml from gdb 8.3 has unused register #, 65 and make first csr register # become 69. We register extra register on gdb to correct csr offset calculation Signed-off-by: Jim Wilson <jimw@sifive.com> Signed-off-by: Chih-Min Chao <chihmin.chao@sifive.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-03-19RISC-V: Add debug support for accessing CSRs.Jim Wilson
Add a debugger field to CPURISCVState. Add riscv_csrrw_debug function to set it. Disable mode checks when debugger field true. Signed-off-by: Jim Wilson <jimw@sifive.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-Id: <20190212230903.9215-1-jimw@sifive.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-03-19RISC-V: Fixes to CSR_* register macros.Jim Wilson
This adds some missing CSR_* register macros, and documents some as being priv v1.9.1 specific. Signed-off-by: Jim Wilson <jimw@sifive.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-Id: <20190212230830.9160-1-jimw@sifive.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-03-17target/riscv: Fix manually parsed 16 bit insnBastian Koppelmann
during the refactor to decodetree we removed the manual decoding that is necessary for c.jal/c.addiw and removed the translation of c.flw/c.ld and c.fsw/c.sd. This reintroduces the manual parsing and the omited implementation. Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Tested-by: Palmer Dabbelt <palmer@sifive.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Tested-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-03-13target/riscv: Remove decode_RV32_64G()Bastian Koppelmann
decodetree handles all instructions now so the fallback is not necessary anymore. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Remove gen_system()Bastian Koppelmann
with all 16 bit insns moved to decodetree no path is falling back to gen_system(), so we can remove it. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Rename trans_arith to gen_arithBastian Koppelmann
Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
2019-03-13target/riscv: Remove manual decoding of RV32/64M insnBastian Koppelmann
Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Remove shift and slt insn manual decodingBastian Koppelmann
Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: make ADD/SUB/OR/XOR/AND insn use arg listsBastian Koppelmann
manual decoding in gen_arith() is not necessary with decodetree. For now the function is called trans_arith as the original gen_arith still exists. The former will be renamed to gen_arith as soon as the old gen_arith can be removed. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Move gen_arith_imm() decoding into trans_* functionsBastian Koppelmann
gen_arith_imm() does a lot of decoding manually, which was hard to read in case of the shift instructions and is not necessary anymore with decodetree. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Remove manual decoding from gen_store()Bastian Koppelmann
With decodetree we don't need to convert RISC-V opcodes into to MemOps as the old gen_store() did. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Remove manual decoding from gen_load()Bastian Koppelmann
With decodetree we don't need to convert RISC-V opcodes into to MemOps as the old gen_load() did. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Remove manual decoding from gen_branch()Bastian Koppelmann
We now utilizes argument-sets of decodetree such that no manual decoding is necessary. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Remove gen_jalr()Bastian Koppelmann
trans_jalr() is the only caller, so move the code into trans_jalr(). Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert quadrant 2 of RVXC insns to decodetreeBastian Koppelmann
Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert quadrant 1 of RVXC insns to decodetreeBastian Koppelmann
Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert quadrant 0 of RVXC insns to decodetreeBastian Koppelmann
Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert RV priv insns to decodetreeBastian Koppelmann
Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert RV64D insns to decodetreeBastian Koppelmann
Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert RV32D insns to decodetreeBastian Koppelmann
Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert RV64F insns to decodetreeBastian Koppelmann
Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert RV32F insns to decodetreeBastian Koppelmann
Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert RV64A insns to decodetreeBastian Koppelmann
Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert RV32A insns to decodetreeBastian Koppelmann
Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert RVXM insns to decodetreeBastian Koppelmann
Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert RVXI csr insns to decodetreeBastian Koppelmann
Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert RVXI fence insns to decodetreeBastian Koppelmann
Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert RVXI arithmetic insns to decodetreeBastian Koppelmann
we cannot remove the call to gen_arith() in decode_RV32_64G() since it is used to translate multiply instructions. Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert RV64I load/store insns to decodetreeBastian Koppelmann
this splits the 64-bit only instructions into its own decode file such that we generate the decoder for these instructions only for the RISC-V 64 bit target. Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert RV32I load/store insns to decodetreeBastian Koppelmann
Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Convert RVXI branch insns to decodetreeBastian Koppelmann
Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Palmer Dabbelt <palmer@sifive.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-03-13target/riscv: Activate decodetree and implemnt LUI & AUIPCBastian Koppelmann
for now only LUI & AUIPC are decoded and translated. If decodetree fails, we fall back to the old decoder. Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Acked-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
2019-02-11target/riscv: fix counter-enable checks in ctr()Xi Wang
Access to a counter in U-mode is permitted only if the corresponding bit is set in both mcounteren and scounteren. The current code ignores mcounteren and checks scounteren only for U-mode access. Signed-off-by: Xi Wang <xi.wang@gmail.com> Reviewed-by: Palmer Dabbelt <palmer@sifive.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-02-11RISC-V: Add misa runtime write supportMichael Clark
This patch adds support for writing misa. misa is validated based on rules in the ISA specification. 'E' is mutually exclusive with all other extensions. 'D' depends on 'F' so 'D' bit is dropped if 'F' is not present. A conservative approach to consistency is taken by flushing the translation cache on misa writes. misa_mask is added to the CPU struct to store the original set of extensions. Signed-off-by: Michael Clark <mjc@sifive.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Palmer Dabbelt <palmer@sifive.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-02-11RISC-V: Add misa.MAFD checks to translateMichael Clark
Add misa checks for M, A, F and D extensions and if they are not present generate illegal instructions. This improves emulation accurary for harts with a limited set of extensions. Signed-off-by: Michael Clark <mjc@sifive.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-02-11RISC-V: Add misa to DisasContextMichael Clark
gen methods should access state from DisasContext. Add misa field to the DisasContext struct and remove CPURISCVState argument from all gen methods. Signed-off-by: Michael Clark <mjc@sifive.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-02-11RISC-V: Add priv_ver to DisasContextAlistair Francis
The gen methods should access state from DisasContext. Add priv_ver field to the DisasContext struct. Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-02-11RISC-V: Use riscv prefix consistently on cpu helpersMichael Clark
* Add riscv prefix to raise_exception function * Add riscv prefix to CSR read/write functions * Add riscv prefix to signal handler function * Add riscv prefix to get fflags function * Remove redundant declaration of riscv_cpu_init and rename cpu_riscv_init to riscv_cpu_init * rename riscv_set_mode to riscv_cpu_set_mode Signed-off-by: Michael Clark <mjc@sifive.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-02-11RISC-V: Implement mstatus.TSR/TW/TVMMichael Clark
This adds the necessary minimum to support S-mode virtualization for priv ISA >= v1.10 Signed-off-by: Michael Clark <mjc@sifive.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Co-authored-by: Matthew Suozzo <msuozzo@google.com> Co-authored-by: Michael Clark <mjc@sifive.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-02-11RISC-V: Mark mstatus.fs dirtyRichard Henderson
Modifed from Richard Henderson's patch [1] to integrate with the new control and status register implementation. [1] https://lists.nongnu.org/archive/html/qemu-devel/2018-03/msg07034.html Note: the f* CSRs already mark mstatus.FS dirty using env->mstatus |= mstatus.FS so the bug in the first spin of this patch has been fixed in a prior commit. Signed-off-by: Michael Clark <mjc@sifive.com> Reviewed-by: Michael Clark <mjc@sifive.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Co-authored-by: Richard Henderson <richard.henderson@linaro.org> Co-authored-by: Michael Clark <mjc@sifive.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-02-11RISC-V: Split out mstatus_fs from tb_flagsRichard Henderson
Signed-off-by: Michael Clark <mjc@sifive.com> Reviewed-by: Michael Clark <mjc@sifive.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-01-09RISC-V: Implement existential predicates for CSRsMichael Clark
CSR predicate functions are added to the CSR table. mstatus.FS and counter enable checks are moved to predicate functions and two new predicates are added to check misa.S for s* CSRs and a new PMP CPU feature for pmp* CSRs. Processors that don't implement S-mode will trap on access to s* CSRs and processors that don't implement PMP will trap on accesses to pmp* CSRs. PMP checks are disabled in riscv_cpu_handle_mmu_fault when the PMP CPU feature is not present. Signed-off-by: Michael Clark <mjc@sifive.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
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