205 lines
6.3 KiB
C
205 lines
6.3 KiB
C
/****************************************************************************
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* arch/risc-v/include/rv32im/syscall.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* This file should never be included directly but, rather, only indirectly
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* through include/syscall.h or include/sys/sycall.h
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*/
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#ifndef __ARCH_RISCV_INCLUDE_RV32IM_SYSCALL_H
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#define __ARCH_RISCV_INCLUDE_RV32IM_SYSCALL_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#ifndef __ASSEMBLY__
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# include <stdint.h>
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#endif
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define SYS_syscall 0x00
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/* Configuration ************************************************************/
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/* SYS call 1 and 2 are defined for internal use by the RISC-V port (see
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* arch/riscv/include/mips32/syscall.h). In addition, SYS call 3 is the
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* return from a SYS call in kernel mode. The first four syscall values
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* must, therefore, be reserved (0 is not used).
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*/
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#ifdef CONFIG_BUILD_KERNEL
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# ifndef CONFIG_SYS_RESERVED
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# error "CONFIG_SYS_RESERVED must be defined to the value 4"
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# elif CONFIG_SYS_RESERVED != 4
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# error "CONFIG_SYS_RESERVED must have the value 4"
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# endif
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#endif
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/* sys_call macros **********************************************************/
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#ifndef __ASSEMBLY__
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/* Context switching system calls *******************************************/
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/* SYS call 0:
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*
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* int riscv_saveusercontext(uint32_t *saveregs);
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*
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* Return:
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* 0: Normal Return
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* 1: Context Switch Return
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*/
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#define SYS_save_context (0)
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#define riscv_saveusercontext(saveregs) \
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(int)sys_call1(SYS_save_context, (uintptr_t)saveregs)
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/* SYS call 1:
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*
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* void riscv_fullcontextrestore(uint32_t *restoreregs) noreturn_function;
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*/
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#define SYS_restore_context (1)
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#define riscv_fullcontextrestore(restoreregs) \
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sys_call1(SYS_restore_context, (uintptr_t)restoreregs)
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/* SYS call 2:
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*
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* void riscv_switchcontext(uint32_t *saveregs, uint32_t *restoreregs);
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*/
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#define SYS_switch_context (2)
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#define riscv_switchcontext(saveregs, restoreregs) \
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sys_call2(SYS_switch_context, (uintptr_t)saveregs, (uintptr_t)restoreregs)
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#ifdef CONFIG_BUILD_KERNEL
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/* SYS call 3:
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*
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* void riscv_syscall_return(void);
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*/
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#define SYS_syscall_return (3)
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#define riscv_syscall_return() (void)sys_call0(SYS_syscall_return)
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#endif
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#endif /* __ASSEMBLY__ */
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Inline functions
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****************************************************************************/
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#ifndef __ASSEMBLY__
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Name: sys_call0
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*
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* Description:
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* System call SYS_ argument and no additional parameters.
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*
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****************************************************************************/
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uintptr_t sys_call0(unsigned int nbr);
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/****************************************************************************
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* Name: sys_call1
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*
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* Description:
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* System call SYS_ argument and one additional parameter.
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*
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****************************************************************************/
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uintptr_t sys_call1(unsigned int nbr, uintptr_t parm1);
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/****************************************************************************
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* Name: sys_call2
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*
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* Description:
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* System call SYS_ argument and two additional parameters.
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*
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****************************************************************************/
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uintptr_t sys_call2(unsigned int nbr, uintptr_t parm1, uintptr_t parm2);
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/****************************************************************************
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* Name: sys_call3
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*
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* Description:
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* System call SYS_ argument and three additional parameters.
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*
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****************************************************************************/
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uintptr_t sys_call3(unsigned int nbr, uintptr_t parm1, uintptr_t parm2,
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uintptr_t parm3);
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/****************************************************************************
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* Name: sys_call4
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*
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* Description:
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* System call SYS_ argument and four additional parameters.
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*
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****************************************************************************/
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uintptr_t sys_call4(unsigned int nbr, uintptr_t parm1, uintptr_t parm2,
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uintptr_t parm3, uintptr_t parm4);
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/****************************************************************************
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* Name: sys_call5
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*
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* Description:
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* System call SYS_ argument and five additional parameters.
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*
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****************************************************************************/
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uintptr_t sys_call5(unsigned int nbr, uintptr_t parm1, uintptr_t parm2,
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uintptr_t parm3, uintptr_t parm4, uintptr_t parm5);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __ARCH_RISCV_INCLUDE_RV32IM_SYSCALL_H */
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