1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Defines APIs that allow an OS to interact with UEFI firmware to query
4  * information about the boot hart ID.
5  *
6  * Copyright (c) 2022, Ventana Micro Systems Inc
7  */
8 
9 #define LOG_CATEGORY LOGC_EFI
10 #include <common.h>
11 #include <efi_loader.h>
12 #include <efi_variable.h>
13 #include <log.h>
14 #include <asm/global_data.h>
15 #include <efi_riscv.h>
16 
17 DECLARE_GLOBAL_DATA_PTR;
18 
19 static const efi_guid_t efi_guid_riscv_boot_protocol = RISCV_EFI_BOOT_PROTOCOL_GUID;
20 
21 /**
22  * efi_riscv_get_boot_hartid() - return boot hart ID
23  * @this:		RISCV_EFI_BOOT_PROTOCOL instance
24  * @boot_hartid:	caller allocated memory to return boot hart id
25  * Return:		status code
26  */
27 static efi_status_t EFIAPI
efi_riscv_get_boot_hartid(struct riscv_efi_boot_protocol * this,efi_uintn_t * boot_hartid)28 efi_riscv_get_boot_hartid(struct riscv_efi_boot_protocol *this,
29 			  efi_uintn_t *boot_hartid)
30 {
31 	EFI_ENTRY("%p, %p",  this, boot_hartid);
32 
33 	if (this != &riscv_efi_boot_prot || !boot_hartid)
34 		return EFI_EXIT(EFI_INVALID_PARAMETER);
35 
36 	*boot_hartid = gd->arch.boot_hart;
37 
38 	return EFI_EXIT(EFI_SUCCESS);
39 }
40 
41 struct riscv_efi_boot_protocol riscv_efi_boot_prot = {
42 	.revision = RISCV_EFI_BOOT_PROTOCOL_REVISION,
43 	.get_boot_hartid = efi_riscv_get_boot_hartid
44 };
45 
46 /**
47  * efi_riscv_register() - register RISCV_EFI_BOOT_PROTOCOL
48  *
49  * Return:	status code
50  */
efi_riscv_register(void)51 efi_status_t efi_riscv_register(void)
52 {
53 	efi_status_t ret = EFI_SUCCESS;
54 
55 	ret = efi_add_protocol(efi_root, &efi_guid_riscv_boot_protocol,
56 			       (void *)&riscv_efi_boot_prot);
57 	if (ret != EFI_SUCCESS)
58 		log_err("Cannot install RISCV_EFI_BOOT_PROTOCOL\n");
59 	return ret;
60 }
61