57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
/**
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* \brief Calls supported by machine mode (or SBI interface in RISC-V)
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* \author Sebastian Sumpf
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* \author Martin Stein
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* \author Stefan Kalkowski
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* \date 2015-06-14
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*/
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/*
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* Copyright (C) 2015-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _SRC__LIB__HW__SPEC__RISCV__MACHINE_CALL_H_
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#define _SRC__LIB__HW__SPEC__RISCV__MACHINE_CALL_H_
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#include <kernel/interface.h>
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namespace Hw {
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using Kernel::addr_t;
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using Kernel::Call_arg;
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using Genode::uint64_t;
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/**
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* SBI calls to machine mode.
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*
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* Keep in sync with exception_vector.s.
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*/
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constexpr Call_arg call_id_set_sys_timer() { return 200; }
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constexpr Call_arg call_id_get_sys_timer() { return 201; }
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inline addr_t ecall(addr_t call, addr_t arg)
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{
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asm volatile ("mv a0, %0\n"
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"mv a1, %1\n"
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"ecall \n"
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"mv %0, a0\n"
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: "+r"(call) : "r"(arg)
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: "a0", "a1");
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return call;
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}
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inline void put_char(addr_t c) {
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ecall(Kernel::call_id_print_char(), c);
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}
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inline void set_sys_timer(addr_t t) {
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Kernel::call(call_id_set_sys_timer(), (Call_arg)t); }
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inline addr_t get_sys_timer() {
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return Kernel::call(call_id_get_sys_timer()); }
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}
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#endif /* _SRC__LIB__HW__SPEC__RISCV__MACHINE_CALL_H_ */
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