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- /*
- * SPDX-License-Identifier: BSD-2-Clause
- *
- * Copyright (c) 2019 Western Digital Corporation or its affiliates.
- *
- * Authors:
- * Anup Patel <anup.patel@wdc.com>
- */
- #include <sbi/sbi_console.h>
- #include <sbi/sbi_ecall.h>
- #include <sbi/sbi_ecall_interface.h>
- #include <sbi/sbi_error.h>
- #include <sbi/sbi_trap.h>
- extern struct sbi_ecall_extension *sbi_ecall_exts[];
- extern unsigned long sbi_ecall_exts_size;
- u16 sbi_ecall_version_major(void)
- {
- return SBI_ECALL_VERSION_MAJOR;
- }
- u16 sbi_ecall_version_minor(void)
- {
- return SBI_ECALL_VERSION_MINOR;
- }
- static unsigned long ecall_impid = SBI_OPENSBI_IMPID;
- unsigned long sbi_ecall_get_impid(void)
- {
- return ecall_impid;
- }
- void sbi_ecall_set_impid(unsigned long impid)
- {
- ecall_impid = impid;
- }
- static SBI_LIST_HEAD(ecall_exts_list);
- struct sbi_ecall_extension *sbi_ecall_find_extension(unsigned long extid)
- {
- struct sbi_ecall_extension *t, *ret = NULL;
- sbi_list_for_each_entry(t, &ecall_exts_list, head) {
- if (t->extid_start <= extid && extid <= t->extid_end) {
- ret = t;
- break;
- }
- }
- return ret;
- }
- int sbi_ecall_register_extension(struct sbi_ecall_extension *ext)
- {
- struct sbi_ecall_extension *t;
- if (!ext || (ext->extid_end < ext->extid_start) || !ext->handle)
- return SBI_EINVAL;
- sbi_list_for_each_entry(t, &ecall_exts_list, head) {
- unsigned long start = t->extid_start;
- unsigned long end = t->extid_end;
- if (end < ext->extid_start || ext->extid_end < start)
- /* no overlap */;
- else
- return SBI_EINVAL;
- }
- SBI_INIT_LIST_HEAD(&ext->head);
- sbi_list_add_tail(&ext->head, &ecall_exts_list);
- return 0;
- }
- void sbi_ecall_unregister_extension(struct sbi_ecall_extension *ext)
- {
- bool found = FALSE;
- struct sbi_ecall_extension *t;
- if (!ext)
- return;
- sbi_list_for_each_entry(t, &ecall_exts_list, head) {
- if (t == ext) {
- found = TRUE;
- break;
- }
- }
- if (found)
- sbi_list_del_init(&ext->head);
- }
- int sbi_ecall_handler(struct sbi_trap_regs *regs)
- {
- int ret = 0;
- struct sbi_ecall_extension *ext;
- unsigned long extension_id = regs->a7;
- unsigned long func_id = regs->a6;
- struct sbi_trap_info trap = {0};
- unsigned long out_val = 0;
- bool is_0_1_spec = 0;
- ext = sbi_ecall_find_extension(extension_id);
- if (ext && ext->handle) {
- ret = ext->handle(extension_id, func_id,
- regs, &out_val, &trap);
- if (extension_id >= SBI_EXT_0_1_SET_TIMER &&
- extension_id <= SBI_EXT_0_1_SHUTDOWN)
- is_0_1_spec = 1;
- } else {
- ret = SBI_ENOTSUPP;
- }
- if (ret == SBI_ETRAP) {
- trap.epc = regs->mepc;
- sbi_trap_redirect(regs, &trap);
- } else {
- if (ret < SBI_LAST_ERR) {
- sbi_printf("%s: Invalid error %d for ext=0x%lx "
- "func=0x%lx\n", __func__, ret,
- extension_id, func_id);
- ret = SBI_ERR_FAILED;
- }
- /*
- * This function should return non-zero value only in case of
- * fatal error. However, there is no good way to distinguish
- * between a fatal and non-fatal errors yet. That's why we treat
- * every return value except ETRAP as non-fatal and just return
- * accordingly for now. Once fatal errors are defined, that
- * case should be handled differently.
- */
- regs->mepc += 4;
- regs->a0 = ret;
- if (!is_0_1_spec)
- regs->a1 = out_val;
- }
- return 0;
- }
- int sbi_ecall_init(void)
- {
- int ret;
- struct sbi_ecall_extension *ext;
- unsigned long i;
- for (i = 0; i < sbi_ecall_exts_size; i++) {
- ext = sbi_ecall_exts[i];
- ret = sbi_ecall_register_extension(ext);
- if (ret)
- return ret;
- }
- return 0;
- }
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