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https://github.com/riscv-software-src/opensbi.git
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f58c14090f
Rather than registering all extensions on their behalf in sbi_ecall_init(), introduce another extension callback and invoke that instead. For now, implement each callback by simply registering the extension, which means this patch has no intended functional change. In later patches, extension callbacks will be modified to choose when to register and to possibly narrow the extension ID range prior to registering. When an extension range needs to remove IDs, leaving gaps, then multiple invocations of sbi_ecall_register_extension() may be used. In summary, later patches for current extensions and the introductions of future extensions will use the new callback to ensure that only valid extension IDs from the initial range, which are also available, will be registered. Signed-off-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Anup Patel <anup@brainfault.org>
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 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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*/
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#ifndef __SBI_ECALL_H__
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#define __SBI_ECALL_H__
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#include <sbi/sbi_types.h>
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#include <sbi/sbi_list.h>
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#define SBI_ECALL_VERSION_MAJOR 1
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#define SBI_ECALL_VERSION_MINOR 0
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#define SBI_OPENSBI_IMPID 1
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struct sbi_trap_regs;
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struct sbi_trap_info;
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struct sbi_ecall_extension {
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struct sbi_dlist head;
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unsigned long extid_start;
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unsigned long extid_end;
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int (* register_extensions)(void);
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int (* probe)(unsigned long extid, unsigned long *out_val);
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int (* handle)(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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u16 sbi_ecall_version_major(void);
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u16 sbi_ecall_version_minor(void);
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unsigned long sbi_ecall_get_impid(void);
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void sbi_ecall_set_impid(unsigned long impid);
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struct sbi_ecall_extension *sbi_ecall_find_extension(unsigned long extid);
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int sbi_ecall_register_extension(struct sbi_ecall_extension *ext);
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void sbi_ecall_unregister_extension(struct sbi_ecall_extension *ext);
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int sbi_ecall_handler(struct sbi_trap_regs *regs);
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int sbi_ecall_init(void);
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#endif
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