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https://github.com/riscv-software-src/opensbi.git
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767b5fc418
No need to do a fully comprehensive count, just find a supported reset or suspend type Signed-off-by: Xiang W <wxjstz@126.com> Signed-off-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Anup Patel <anup@brainfault.org>
92 lines
2.0 KiB
C
92 lines
2.0 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2020 Western Digital Corporation or its affiliates.
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*
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* Authors:
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* Anup Patel <anup.patel@wdc.com>
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* Atish Patra <atish.patra@wdc.com>
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*/
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#include <sbi/sbi_error.h>
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#include <sbi/sbi_ecall.h>
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#include <sbi/sbi_ecall_interface.h>
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#include <sbi/sbi_trap.h>
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#include <sbi/sbi_system.h>
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static int sbi_ecall_srst_handler(unsigned long extid, unsigned long funcid,
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const struct sbi_trap_regs *regs,
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unsigned long *out_val,
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struct sbi_trap_info *out_trap)
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{
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if (funcid == SBI_EXT_SRST_RESET) {
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if ((((u32)-1U) <= ((u64)regs->a0)) ||
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(((u32)-1U) <= ((u64)regs->a1)))
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return SBI_EINVAL;
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switch (regs->a0) {
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case SBI_SRST_RESET_TYPE_SHUTDOWN:
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case SBI_SRST_RESET_TYPE_COLD_REBOOT:
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case SBI_SRST_RESET_TYPE_WARM_REBOOT:
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break;
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default:
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return SBI_EINVAL;
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}
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switch (regs->a1) {
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case SBI_SRST_RESET_REASON_NONE:
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case SBI_SRST_RESET_REASON_SYSFAIL:
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break;
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default:
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return SBI_EINVAL;
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}
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if (sbi_system_reset_supported(regs->a0, regs->a1))
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sbi_system_reset(regs->a0, regs->a1);
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}
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return SBI_ENOTSUPP;
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}
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static int sbi_ecall_srst_probe(unsigned long extid, unsigned long *out_val)
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{
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u32 type;
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/*
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* At least one standard reset types should be supported by
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* the platform for SBI SRST extension to be usable.
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*/
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for (type = 0; type <= SBI_SRST_RESET_TYPE_LAST; type++) {
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if (sbi_system_reset_supported(type,
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SBI_SRST_RESET_REASON_NONE)) {
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*out_val = 1;
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return 0;
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}
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}
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*out_val = 0;
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return 0;
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}
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struct sbi_ecall_extension ecall_srst;
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static int sbi_ecall_srst_register_extensions(void)
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{
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unsigned long out_val;
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sbi_ecall_srst_probe(SBI_EXT_SRST, &out_val);
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if (!out_val)
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return 0;
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return sbi_ecall_register_extension(&ecall_srst);
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}
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struct sbi_ecall_extension ecall_srst = {
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.extid_start = SBI_EXT_SRST,
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.extid_end = SBI_EXT_SRST,
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.register_extensions = sbi_ecall_srst_register_extensions,
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.probe = sbi_ecall_srst_probe,
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.handle = sbi_ecall_srst_handler,
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};
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