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 cmdline, 13 unsigned long systab); 14 15 efi_status_t check_platform_features(void) 16 { 17 return EFI_SUCCESS; 18 } 19 20 struct exit_boot_struct { 21 efi_memory_desc_t *runtime_map; 22 int runtime_entry_count; 23 }; 24 25 static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv) 26 { 27 struct exit_boot_struct *p = priv; 28 29 /* 30 * Update the memory map with virtual addresses. The function will also 31 * populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME 32 * entries so that we can pass it straight to SetVirtualAddressMap() 33 */ 34 efi_get_virtmap(map->map, map->map_size, map->desc_size, 35 p->runtime_map, &p->runtime_entry_count); 36 37 return EFI_SUCCESS; 38 } 39 40 unsigned long __weak kernel_entry_address(void) 41 { 42 return *(unsigned long *)(PHYSADDR(VMLINUX_LOAD_ADDRESS) + 8); 43 } 44 45 efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image, 46 unsigned long kernel_addr, char *cmdline_ptr) 47 { 48 kernel_entry_t real_kernel_entry; 49 struct exit_boot_struct priv; 50 unsigned long desc_size; 51 efi_status_t status; 52 u32 desc_ver; 53 54 status = efi_alloc_virtmap(&priv.runtime_map, &desc_size, &desc_ver); 55 if (status != EFI_SUCCESS) { 56 efi_err("Unable to retrieve UEFI memory map.\n"); 57 return status; 58 } 59 60 efi_info("Exiting boot services\n"); 61 62 efi_novamap = false; 63 status = efi_exit_boot_services(handle, &priv, exit_boot_func); 64 if (status != EFI_SUCCESS) 65 return status; 66 67 /* Install the new virtual address map */ 68 efi_rt_call(set_virtual_address_map, 69 priv.runtime_entry_count * desc_size, desc_size, 70 desc_ver, priv.runtime_map); 71 72 /* Config Direct Mapping */ 73 csr_write64(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0); 74 csr_write64(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1); 75 76 real_kernel_entry = (void *)kernel_entry_address(); 77 78 real_kernel_entry(true, (unsigned long)cmdline_ptr, 79 (unsigned long)efi_system_table); 80 } 81