1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Author: Yun Liu <liuyun@loongson.cn> 4 * Huacai Chen <chenhuacai@loongson.cn> 5 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 6 */ 7 8 #include <asm/efi.h> 9 #include <asm/addrspace.h> 10 #include "efistub.h" 11 12 typedef void __noreturn (*kernel_entry_t)(bool efi, unsigned long fdt); 13 14 extern int kernel_asize; 15 extern int kernel_fsize; 16 extern int kernel_offset; 17 extern kernel_entry_t kernel_entry; 18 19 efi_status_t check_platform_features(void) 20 { 21 return EFI_SUCCESS; 22 } 23 24 efi_status_t handle_kernel_image(unsigned long *image_addr, 25 unsigned long *image_size, 26 unsigned long *reserve_addr, 27 unsigned long *reserve_size, 28 efi_loaded_image_t *image, 29 efi_handle_t image_handle) 30 { 31 efi_status_t status; 32 unsigned long kernel_addr = 0; 33 34 kernel_addr = (unsigned long)&kernel_offset - kernel_offset; 35 36 status = efi_relocate_kernel(&kernel_addr, kernel_fsize, kernel_asize, 37 PHYSADDR(VMLINUX_LOAD_ADDRESS), SZ_2M, 0x0); 38 39 *image_addr = kernel_addr; 40 *image_size = kernel_asize; 41 42 return status; 43 } 44 45 void __noreturn efi_enter_kernel(unsigned long entrypoint, unsigned long fdt, unsigned long fdt_size) 46 { 47 kernel_entry_t real_kernel_entry; 48 49 /* Config Direct Mapping */ 50 csr_write64(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0); 51 csr_write64(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1); 52 53 real_kernel_entry = (kernel_entry_t) 54 ((unsigned long)&kernel_entry - entrypoint + VMLINUX_LOAD_ADDRESS); 55 56 if (!efi_novamap) 57 real_kernel_entry(true, fdt); 58 else 59 real_kernel_entry(false, fdt); 60 } 61