172 lines
3.6 KiB
C
172 lines
3.6 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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#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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u16 sbi_ecall_version_major(void)
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{
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return SBI_ECALL_VERSION_MAJOR;
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}
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u16 sbi_ecall_version_minor(void)
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{
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return SBI_ECALL_VERSION_MINOR;
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}
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static unsigned long ecall_impid = SBI_OPENSBI_IMPID;
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unsigned long sbi_ecall_get_impid(void)
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{
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return ecall_impid;
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}
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void sbi_ecall_set_impid(unsigned long impid)
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{
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ecall_impid = impid;
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}
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static SBI_LIST_HEAD(ecall_exts_list);
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struct sbi_ecall_extension *sbi_ecall_find_extension(unsigned long extid)
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{
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struct sbi_ecall_extension *t, *ret = NULL;
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sbi_list_for_each_entry(t, &ecall_exts_list, head) {
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if (t->extid_start <= extid && extid <= t->extid_end) {
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ret = t;
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break;
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}
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}
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return ret;
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}
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int sbi_ecall_register_extension(struct sbi_ecall_extension *ext)
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{
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struct sbi_ecall_extension *t;
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if (!ext || (ext->extid_end < ext->extid_start) || !ext->handle)
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return SBI_EINVAL;
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sbi_list_for_each_entry(t, &ecall_exts_list, head) {
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unsigned long start = t->extid_start;
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unsigned long end = t->extid_end;
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if (end < ext->extid_start || ext->extid_end < start)
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/* no overlap */;
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else
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return SBI_EINVAL;
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}
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SBI_INIT_LIST_HEAD(&ext->head);
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sbi_list_add_tail(&ext->head, &ecall_exts_list);
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return 0;
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}
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void sbi_ecall_unregister_extension(struct sbi_ecall_extension *ext)
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{
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bool found = FALSE;
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struct sbi_ecall_extension *t;
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if (!ext)
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return;
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sbi_list_for_each_entry(t, &ecall_exts_list, head) {
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if (t == ext) {
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found = TRUE;
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break;
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}
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}
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if (found)
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sbi_list_del_init(&ext->head);
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}
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int sbi_ecall_handler(struct sbi_trap_regs *regs)
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{
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int ret = 0;
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struct sbi_ecall_extension *ext;
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unsigned long extension_id = regs->a7;
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unsigned long func_id = regs->a6;
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struct sbi_trap_info trap = {0};
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unsigned long out_val = 0;
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bool is_0_1_spec = 0;
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unsigned long args[6];
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args[0] = regs->a0;
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args[1] = regs->a1;
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args[2] = regs->a2;
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args[3] = regs->a3;
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args[4] = regs->a4;
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args[5] = regs->a5;
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ext = sbi_ecall_find_extension(extension_id);
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if (ext && ext->handle) {
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ret = ext->handle(extension_id, func_id,
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args, &out_val, &trap);
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if (extension_id >= SBI_EXT_0_1_SET_TIMER &&
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extension_id <= SBI_EXT_0_1_SHUTDOWN)
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is_0_1_spec = 1;
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} else {
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ret = SBI_ENOTSUPP;
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}
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if (ret == SBI_ETRAP) {
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trap.epc = regs->mepc;
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sbi_trap_redirect(regs, &trap);
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} else {
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/*
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* This function should return non-zero value only in case of
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* fatal error. However, there is no good way to distinguish
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* between a fatal and non-fatal errors yet. That's why we treat
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* every return value except ETRAP as non-fatal and just return
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* accordingly for now. Once fatal errors are defined, that
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* case should be handled differently.
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*/
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regs->mepc += 4;
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regs->a0 = ret;
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if (!is_0_1_spec)
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regs->a1 = out_val;
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}
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return 0;
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}
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int sbi_ecall_init(void)
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{
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int ret;
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/* The order of below registrations is performance optimized */
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ret = sbi_ecall_register_extension(&ecall_time);
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if (ret)
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return ret;
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ret = sbi_ecall_register_extension(&ecall_rfence);
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if (ret)
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return ret;
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ret = sbi_ecall_register_extension(&ecall_ipi);
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if (ret)
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return ret;
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ret = sbi_ecall_register_extension(&ecall_base);
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if (ret)
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return ret;
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ret = sbi_ecall_register_extension(&ecall_hsm);
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if (ret)
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return ret;
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ret = sbi_ecall_register_extension(&ecall_legacy);
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if (ret)
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return ret;
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ret = sbi_ecall_register_extension(&ecall_vendor);
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if (ret)
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return ret;
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return 0;
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}
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