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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>
56 lines
1.4 KiB
C
56 lines
1.4 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_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_platform.h>
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#include <sbi/sbi_trap.h>
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#include <sbi/riscv_asm.h>
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static inline unsigned long sbi_ecall_vendor_id(void)
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{
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return SBI_EXT_VENDOR_START +
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(csr_read(CSR_MVENDORID) &
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(SBI_EXT_VENDOR_END - SBI_EXT_VENDOR_START));
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}
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static int sbi_ecall_vendor_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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return sbi_platform_vendor_ext_provider(sbi_platform_thishart_ptr(),
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funcid, regs,
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out_val, out_trap);
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}
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struct sbi_ecall_extension ecall_vendor;
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static int sbi_ecall_vendor_register_extensions(void)
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{
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unsigned long extid = sbi_ecall_vendor_id();
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if (!sbi_platform_vendor_ext_check(sbi_platform_thishart_ptr()))
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return 0;
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ecall_vendor.extid_start = extid;
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ecall_vendor.extid_end = extid;
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return sbi_ecall_register_extension(&ecall_vendor);
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}
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struct sbi_ecall_extension ecall_vendor = {
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.extid_start = SBI_EXT_VENDOR_START,
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.extid_end = SBI_EXT_VENDOR_END,
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.register_extensions = sbi_ecall_vendor_register_extensions,
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.handle = sbi_ecall_vendor_handler,
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};
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