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https://github.com/riscv-software-src/opensbi.git
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8b952d4fcd
When an extension implements a probe function it means there's a chance that the extension is not available. Use this function in the register_extensions callback to determine if the extension should be registered at all. Where the probe implementation is simple, just open code the check. Signed-off-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Anup Patel <anup@brainfault.org>
75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2023 Ventana Micro Systems Inc.
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*
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*/
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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_error.h>
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#include <sbi/sbi_trap.h>
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#include <sbi/sbi_cppc.h>
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static int sbi_ecall_cppc_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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int ret = 0;
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uint64_t temp;
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switch (funcid) {
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case SBI_EXT_CPPC_READ:
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ret = sbi_cppc_read(regs->a0, &temp);
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*out_val = temp;
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break;
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case SBI_EXT_CPPC_READ_HI:
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#if __riscv_xlen == 32
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ret = sbi_cppc_read(regs->a0, &temp);
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*out_val = temp >> 32;
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#else
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*out_val = 0;
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#endif
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break;
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case SBI_EXT_CPPC_WRITE:
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ret = sbi_cppc_write(regs->a0, regs->a1);
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break;
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case SBI_EXT_CPPC_PROBE:
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ret = sbi_cppc_probe(regs->a0);
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if (ret >= 0) {
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*out_val = ret;
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ret = 0;
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}
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break;
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default:
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ret = SBI_ENOTSUPP;
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}
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return ret;
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}
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static int sbi_ecall_cppc_probe(unsigned long extid, unsigned long *out_val)
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{
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*out_val = sbi_cppc_get_device() ? 1 : 0;
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return 0;
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}
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struct sbi_ecall_extension ecall_cppc;
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static int sbi_ecall_cppc_register_extensions(void)
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{
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if (!sbi_cppc_get_device())
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return 0;
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return sbi_ecall_register_extension(&ecall_cppc);
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}
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struct sbi_ecall_extension ecall_cppc = {
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.extid_start = SBI_EXT_CPPC,
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.extid_end = SBI_EXT_CPPC,
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.register_extensions = sbi_ecall_cppc_register_extensions,
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.probe = sbi_ecall_cppc_probe,
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.handle = sbi_ecall_cppc_handler,
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};
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