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https://github.com/riscv-software-src/opensbi.git
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3284bea833
Some of the upcoming SBI extensions (such as SSE) will directly update register state so improve the prototype of ecall handler to accommodate this. Further, this flexibility allows us to push the trap redirection from sbi_ecall_handler() to the sbi_ecall_legacy_handler(). Signed-off-by: Anup Patel <apatel@ventanamicro.com>
83 lines
1.8 KiB
C
83 lines
1.8 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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struct sbi_trap_regs *regs,
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struct sbi_ecall_return *out)
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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 bool srst_available(void)
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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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return true;
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}
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return false;
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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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if (!srst_available())
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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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.handle = sbi_ecall_srst_handler,
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};
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