29f8648ecc
This is the initial version for kernel mode build on the arm64 platform. It works much in the same way as the risc-v implementation so any highlights can be read from there. Features that have been tested working: - Creating address environments - Loading init (nsh) from elf file - Booting to nsh - Starting other processes from nsh - ostest runs to completion Features that are not tested / do not work: - SHM / shared memory support - Kernel memory mapping (MM_KMAP) - fork/vfork An example qemu target is provided as a separate patch: tools/configure.sh qemu-armv8a:knsh
367 lines
9.7 KiB
C
367 lines
9.7 KiB
C
/****************************************************************************
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* arch/arm64/include/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_ARM64_INCLUDE_SYSCALL_H
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#define __ARCH_ARM64_INCLUDE_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 Prototypes
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****************************************************************************/
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#define SYS_syscall 0x00
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#define SYS_smhcall 0xf000
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/* Configuration ************************************************************/
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/* This logic uses three system calls {0,1,2} for context switching and one
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* for the syscall return.
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* So a minimum of four syscall values must be reserved.
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* If CONFIG_BUILD_PROTECTED is defined, then four more syscall values must
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* be reserved.
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*/
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#ifndef CONFIG_BUILD_FLAT
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# define CONFIG_SYS_RESERVED 6
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#else
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# define CONFIG_SYS_RESERVED 4
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#endif
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/* system calls */
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/* SYS call 0:
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*
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* int up_saveusercontext(void *saveregs);
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*/
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#define SYS_save_context (0)
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/* SYS call 1:
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*
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* void arm64_fullcontextrestore(void *restoreregs) noreturn_function;
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*/
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#define SYS_restore_context (1)
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/* SYS call 2:
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*
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* void arm64_switchcontext(void **saveregs, void *restoreregs);
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*/
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#define SYS_switch_context (2)
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#ifndef CONFIG_BUILD_FLAT
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/* SYS call 6:
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*
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* void signal_handler(_sa_sigaction_t sighand,
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* int signo, siginfo_t *info,
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* void *ucontext);
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*/
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#define SYS_signal_handler (4)
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/* SYS call 7:
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*
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* void signal_handler_return(void);
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*/
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#define SYS_signal_handler_return (5)
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#endif /* !CONFIG_BUILD_FLAT */
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#define ARM_SMCC_RES_A0 (0)
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#define ARM_SMCC_RES_A1 (1)
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#define ARM_SMCC_RES_A2 (2)
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#define ARM_SMCC_RES_A3 (3)
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#define ARM_SMCC_RES_A4 (4)
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#define ARM_SMCC_RES_A5 (5)
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#define ARM_SMCC_RES_A6 (6)
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#define ARM_SMCC_RES_A7 (7)
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#ifndef __ASSEMBLY__
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* Result from SMC/HVC call
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* a0-a7 result values from registers 0 to 7
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*/
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struct arm64_smccc_res
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{
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unsigned long a0;
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unsigned long a1;
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unsigned long a2;
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unsigned long a3;
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unsigned long a4;
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unsigned long a5;
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unsigned long a6;
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unsigned long a7;
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};
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typedef struct arm64_smccc_res arm64_smccc_res_t;
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enum arm64_smccc_conduit
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{
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SMCCC_CONDUIT_NONE,
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SMCCC_CONDUIT_SMC,
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SMCCC_CONDUIT_HVC,
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};
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/****************************************************************************
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* Inline functions
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****************************************************************************/
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/* SVC with SYS_ call number and no parameters */
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static inline uintptr_t sys_call0(unsigned int nbr)
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{
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register uint64_t reg0 __asm__("x0") = (uint64_t)(nbr);
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__asm__ __volatile__
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(
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"svc %1"
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: "=r"(reg0)
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: "i"(SYS_syscall), "r"(reg0)
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: "memory", "x30"
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);
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return reg0;
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}
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/* SVC with SYS_ call number and one parameter */
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static inline uintptr_t sys_call1(unsigned int nbr, uintptr_t parm1)
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{
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register uint64_t reg0 __asm__("x0") = (uint64_t)(nbr);
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register uint64_t reg1 __asm__("x1") = (uint64_t)(parm1);
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__asm__ __volatile__
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(
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"svc %1"
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: "=r"(reg0)
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: "i"(SYS_syscall), "r"(reg0), "r"(reg1)
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: "memory", "x30"
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);
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return reg0;
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}
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/* SVC with SYS_ call number and two parameters */
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static inline uintptr_t sys_call2(unsigned int nbr, uintptr_t parm1,
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uintptr_t parm2)
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{
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register uint64_t reg0 __asm__("x0") = (uint64_t)(nbr);
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register uint64_t reg2 __asm__("x2") = (uint64_t)(parm2);
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register uint64_t reg1 __asm__("x1") = (uint64_t)(parm1);
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__asm__ __volatile__
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(
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"svc %1"
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: "=r"(reg0)
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: "i"(SYS_syscall), "r"(reg0), "r"(reg1), "r"(reg2)
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: "memory", "x30"
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);
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return reg0;
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}
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/* SVC with SYS_ call number and three parameters */
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static inline uintptr_t sys_call3(unsigned int nbr, uintptr_t parm1,
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uintptr_t parm2, uintptr_t parm3)
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{
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register uint64_t reg0 __asm__("x0") = (uint64_t)(nbr);
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register uint64_t reg3 __asm__("x3") = (uint64_t)(parm3);
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register uint64_t reg2 __asm__("x2") = (uint64_t)(parm2);
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register uint64_t reg1 __asm__("x1") = (uint64_t)(parm1);
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__asm__ __volatile__
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(
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"svc %1"
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: "=r"(reg0)
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: "i"(SYS_syscall), "r"(reg0), "r"(reg1), "r"(reg2),
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"r"(reg3)
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: "memory", "x30"
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);
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return reg0;
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}
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/* SVC with SYS_ call number and four parameters */
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static inline uintptr_t sys_call4(unsigned int nbr, uintptr_t parm1,
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uintptr_t parm2, uintptr_t parm3,
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uintptr_t parm4)
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{
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register uint64_t reg0 __asm__("x0") = (uint64_t)(nbr);
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register uint64_t reg4 __asm__("x4") = (uint64_t)(parm4);
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register uint64_t reg3 __asm__("x3") = (uint64_t)(parm3);
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register uint64_t reg2 __asm__("x2") = (uint64_t)(parm2);
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register uint64_t reg1 __asm__("x1") = (uint64_t)(parm1);
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__asm__ __volatile__
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(
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"svc %1"
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: "=r"(reg0)
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: "i"(SYS_syscall), "r"(reg0), "r"(reg1), "r"(reg2),
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"r"(reg3), "r"(reg4)
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: "memory", "x30"
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);
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return reg0;
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}
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/* SVC with SYS_ call number and five parameters */
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static inline uintptr_t sys_call5(unsigned int nbr, uintptr_t parm1,
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uintptr_t parm2, uintptr_t parm3,
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uintptr_t parm4, uintptr_t parm5)
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{
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register uint64_t reg0 __asm__("x0") = (uint64_t)(nbr);
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register uint64_t reg5 __asm__("x5") = (uint64_t)(parm5);
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register uint64_t reg4 __asm__("x4") = (uint64_t)(parm4);
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register uint64_t reg3 __asm__("x3") = (uint64_t)(parm3);
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register uint64_t reg2 __asm__("x2") = (uint64_t)(parm2);
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register uint64_t reg1 __asm__("x1") = (uint64_t)(parm1);
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__asm__ __volatile__
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(
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"svc %1"
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: "=r"(reg0)
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: "i"(SYS_syscall), "r"(reg0), "r"(reg1), "r"(reg2),
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"r"(reg3), "r"(reg4), "r"(reg5)
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: "memory", "x30"
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);
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return reg0;
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}
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/* SVC with SYS_ call number and six parameters */
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static inline uintptr_t sys_call6(unsigned int nbr, uintptr_t parm1,
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uintptr_t parm2, uintptr_t parm3,
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uintptr_t parm4, uintptr_t parm5,
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uintptr_t parm6)
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{
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register uint64_t reg0 __asm__("x0") = (uint64_t)(nbr);
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register uint64_t reg6 __asm__("x6") = (uint64_t)(parm6);
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register uint64_t reg5 __asm__("x5") = (uint64_t)(parm5);
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register uint64_t reg4 __asm__("x4") = (uint64_t)(parm4);
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register uint64_t reg3 __asm__("x3") = (uint64_t)(parm3);
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register uint64_t reg2 __asm__("x2") = (uint64_t)(parm2);
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register uint64_t reg1 __asm__("x1") = (uint64_t)(parm1);
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__asm__ __volatile__
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(
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"svc %1"
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: "=r"(reg0)
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: "i"(SYS_syscall), "r"(reg0), "r"(reg1), "r"(reg2),
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"r"(reg3), "r"(reg4), "r"(reg5), "r"(reg6)
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: "memory", "x30"
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);
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return reg0;
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}
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/* semihosting(SMH) call with call number and one parameter */
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static inline long smh_call(unsigned int nbr, void *parm)
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{
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register uint64_t reg0 __asm__("x0") = (uint64_t)(nbr);
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register uint64_t reg1 __asm__("x1") = (uint64_t)(parm);
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__asm__ __volatile__
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(
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"hlt %1"
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: "=r"(reg0)
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: "i"(SYS_smhcall), "r"(reg0), "r"(reg1)
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: "memory", "x30"
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);
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return reg0;
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}
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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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/* Make HVC calls
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*
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* param a0 function identifier
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* param a1-a7 parameters registers
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* param res results
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*/
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void arm64_smccc_hvc(unsigned long a0, unsigned long a1,
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unsigned long a2, unsigned long a3,
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unsigned long a4, unsigned long a5,
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unsigned long a6, unsigned long a7,
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struct arm64_smccc_res *res);
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/* Make SMC calls
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*
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* param a0 function identifier
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* param a1-a7 parameters registers
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* param res results
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*/
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void arm64_smccc_smc(unsigned long a0, unsigned long a1,
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unsigned long a2, unsigned long a3,
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unsigned long a4, unsigned long a5,
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unsigned long a6, unsigned long a7,
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struct arm64_smccc_res *res);
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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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#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_ARM64_INCLUDE_SYSCALL_H */
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