forked from Mirrors/opensbi
80bc5065bb
We had added args pointer in ecall handler to ensure that ecall handler only implements functionality and does not deal with SBI calling convention. This also helped us to keep SBI calling convention related code in one place at sbi_ecall_handler(). The Keystone Enclavce project needs access to the trap regsiters in their ecall handler so that they can context switch enclaves in custom SBI calls. To help the Keystone Enclave project, we replace the args pointer in ecall handler parameter with a const pointer to trap registers. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
80 lines
1.8 KiB
C
80 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_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_version.h>
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#include <sbi/riscv_asm.h>
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static int sbi_ecall_base_probe(unsigned long extid, unsigned long *out_val)
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{
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struct sbi_ecall_extension *ext;
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ext = sbi_ecall_find_extension(extid);
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if (!ext) {
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*out_val = 0;
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return 0;
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}
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if (ext->probe)
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return ext->probe(extid, out_val);
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*out_val = 1;
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return 0;
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}
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static int sbi_ecall_base_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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switch (funcid) {
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case SBI_EXT_BASE_GET_SPEC_VERSION:
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*out_val = (SBI_ECALL_VERSION_MAJOR <<
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SBI_SPEC_VERSION_MAJOR_OFFSET) &
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(SBI_SPEC_VERSION_MAJOR_MASK <<
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SBI_SPEC_VERSION_MAJOR_OFFSET);
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*out_val = *out_val | SBI_ECALL_VERSION_MINOR;
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break;
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case SBI_EXT_BASE_GET_IMP_ID:
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*out_val = sbi_ecall_get_impid();
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break;
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case SBI_EXT_BASE_GET_IMP_VERSION:
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*out_val = OPENSBI_VERSION;
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break;
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case SBI_EXT_BASE_GET_MVENDORID:
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*out_val = csr_read(CSR_MVENDORID);
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break;
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case SBI_EXT_BASE_GET_MARCHID:
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*out_val = csr_read(CSR_MARCHID);
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break;
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case SBI_EXT_BASE_GET_MIMPID:
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*out_val = csr_read(CSR_MIMPID);
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break;
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case SBI_EXT_BASE_PROBE_EXT:
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ret = sbi_ecall_base_probe(regs->a0, out_val);
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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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struct sbi_ecall_extension ecall_base = {
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.extid_start = SBI_EXT_BASE,
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.extid_end = SBI_EXT_BASE,
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.handle = sbi_ecall_base_handler,
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};
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