diff options
Diffstat (limited to 'lib/efi_loader/efi_riscv.c')
-rw-r--r-- | lib/efi_loader/efi_riscv.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/lib/efi_loader/efi_riscv.c b/lib/efi_loader/efi_riscv.c new file mode 100644 index 0000000..bccfefd --- /dev/null +++ b/lib/efi_loader/efi_riscv.c @@ -0,0 +1,60 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Defines APIs that allow an OS to interact with UEFI firmware to query + * information about the boot hart ID. + * + * Copyright (c) 2022, Ventana Micro Systems Inc + */ + +#define LOG_CATEGORY LOGC_EFI +#include <common.h> +#include <efi_loader.h> +#include <efi_variable.h> +#include <log.h> +#include <asm/global_data.h> +#include <efi_riscv.h> + +DECLARE_GLOBAL_DATA_PTR; + +static const efi_guid_t efi_guid_riscv_boot_protocol = RISCV_EFI_BOOT_PROTOCOL_GUID; + +/** + * efi_riscv_get_boot_hartid() - return boot hart ID + * @this: RISCV_EFI_BOOT_PROTOCOL instance + * @boot_hartid: caller allocated memory to return boot hart id + * Return: status code + */ +static efi_status_t EFIAPI +efi_riscv_get_boot_hartid(struct riscv_efi_boot_protocol *this, + efi_uintn_t *boot_hartid) +{ + EFI_ENTRY("%p, %p", this, boot_hartid); + + if (this != &riscv_efi_boot_prot || !boot_hartid) + return EFI_INVALID_PARAMETER; + + *boot_hartid = gd->arch.boot_hart; + + return EFI_EXIT(EFI_SUCCESS); +} + +struct riscv_efi_boot_protocol riscv_efi_boot_prot = { + .revision = RISCV_EFI_BOOT_PROTOCOL_REVISION, + .get_boot_hartid = efi_riscv_get_boot_hartid +}; + +/** + * efi_riscv_register() - register RISCV_EFI_BOOT_PROTOCOL + * + * Return: status code + */ +efi_status_t efi_riscv_register(void) +{ + efi_status_t ret = EFI_SUCCESS; + + ret = efi_add_protocol(efi_root, &efi_guid_riscv_boot_protocol, + (void *)&riscv_efi_boot_prot); + if (ret != EFI_SUCCESS) + log_err("Cannot install RISCV_EFI_BOOT_PROTOCOL\n"); + return ret; +} |