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6d60b6ee0c
This patch contains code that interfaces with devices that are mandated by the RISC-V supervisor specification and that don't have explicit drivers anywhere else in the tree. This includes the staticly defined interrupts, the CSR-mapped timer, and virtualized SBI devices. Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/*
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* Copyright (C) 2015 Regents of the University of California
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _ASM_RISCV_SBI_H
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#define _ASM_RISCV_SBI_H
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#include <linux/types.h>
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#define SBI_SET_TIMER 0
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#define SBI_CONSOLE_PUTCHAR 1
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#define SBI_CONSOLE_GETCHAR 2
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#define SBI_CLEAR_IPI 3
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#define SBI_SEND_IPI 4
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#define SBI_REMOTE_FENCE_I 5
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#define SBI_REMOTE_SFENCE_VMA 6
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#define SBI_REMOTE_SFENCE_VMA_ASID 7
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#define SBI_SHUTDOWN 8
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#define SBI_CALL(which, arg0, arg1, arg2) ({ \
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register uintptr_t a0 asm ("a0") = (uintptr_t)(arg0); \
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register uintptr_t a1 asm ("a1") = (uintptr_t)(arg1); \
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register uintptr_t a2 asm ("a2") = (uintptr_t)(arg2); \
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register uintptr_t a7 asm ("a7") = (uintptr_t)(which); \
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asm volatile ("ecall" \
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: "+r" (a0) \
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: "r" (a1), "r" (a2), "r" (a7) \
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: "memory"); \
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a0; \
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})
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/* Lazy implementations until SBI is finalized */
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#define SBI_CALL_0(which) SBI_CALL(which, 0, 0, 0)
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#define SBI_CALL_1(which, arg0) SBI_CALL(which, arg0, 0, 0)
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#define SBI_CALL_2(which, arg0, arg1) SBI_CALL(which, arg0, arg1, 0)
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static inline void sbi_console_putchar(int ch)
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{
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SBI_CALL_1(SBI_CONSOLE_PUTCHAR, ch);
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}
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static inline int sbi_console_getchar(void)
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{
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return SBI_CALL_0(SBI_CONSOLE_GETCHAR);
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}
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static inline void sbi_set_timer(uint64_t stime_value)
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{
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#if __riscv_xlen == 32
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SBI_CALL_2(SBI_SET_TIMER, stime_value, stime_value >> 32);
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#else
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SBI_CALL_1(SBI_SET_TIMER, stime_value);
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#endif
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}
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static inline void sbi_shutdown(void)
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{
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SBI_CALL_0(SBI_SHUTDOWN);
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}
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static inline void sbi_clear_ipi(void)
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{
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SBI_CALL_0(SBI_CLEAR_IPI);
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}
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static inline void sbi_send_ipi(const unsigned long *hart_mask)
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{
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SBI_CALL_1(SBI_SEND_IPI, hart_mask);
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}
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static inline void sbi_remote_fence_i(const unsigned long *hart_mask)
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{
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SBI_CALL_1(SBI_REMOTE_FENCE_I, hart_mask);
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}
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static inline void sbi_remote_sfence_vma(const unsigned long *hart_mask,
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unsigned long start,
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unsigned long size)
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{
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SBI_CALL_1(SBI_REMOTE_SFENCE_VMA, hart_mask);
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}
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static inline void sbi_remote_sfence_vma_asid(const unsigned long *hart_mask,
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unsigned long start,
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unsigned long size,
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unsigned long asid)
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{
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SBI_CALL_1(SBI_REMOTE_SFENCE_VMA_ASID, hart_mask);
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}
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#endif
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