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 #include "loongarch-stub.h" 12 13 typedef void __noreturn (*kernel_entry_t)(bool efi, unsigned long cmdline, 14 unsigned long systab); 15 16 efi_status_t check_platform_features(void) 17 { 18 return EFI_SUCCESS; 19 } 20 21 struct exit_boot_struct { 22 efi_memory_desc_t *runtime_map; 23 int runtime_entry_count; 24 }; 25 26 static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv) 27 { 28 struct exit_boot_struct *p = priv; 29 30 /* 31 * Update the memory map with virtual addresses. The function will also 32 * populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME 33 * entries so that we can pass it straight to SetVirtualAddressMap() 34 */ 35 efi_get_virtmap(map->map, map->map_size, map->desc_size, 36 p->runtime_map, &p->runtime_entry_count); 37 38 return EFI_SUCCESS; 39 } 40 41 unsigned long __weak kernel_entry_address(unsigned long kernel_addr, 42 efi_loaded_image_t *image) 43 { 44 return *(unsigned long *)(kernel_addr + 8) - PHYSADDR(VMLINUX_LOAD_ADDRESS) + kernel_addr; 45 } 46 47 efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image, 48 unsigned long kernel_addr, char *cmdline_ptr) 49 { 50 kernel_entry_t real_kernel_entry; 51 struct exit_boot_struct priv; 52 unsigned long desc_size; 53 efi_status_t status; 54 u32 desc_ver; 55 56 status = efi_alloc_virtmap(&priv.runtime_map, &desc_size, &desc_ver); 57 if (status != EFI_SUCCESS) { 58 efi_err("Unable to retrieve UEFI memory map.\n"); 59 return status; 60 } 61 62 efi_info("Exiting boot services\n"); 63 64 efi_novamap = false; 65 status = efi_exit_boot_services(handle, &priv, exit_boot_func); 66 if (status != EFI_SUCCESS) 67 return status; 68 69 /* Install the new virtual address map */ 70 efi_rt_call(set_virtual_address_map, 71 priv.runtime_entry_count * desc_size, desc_size, 72 desc_ver, priv.runtime_map); 73 74 /* Config Direct Mapping */ 75 csr_write64(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0); 76 csr_write64(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1); 77 csr_write64(CSR_DMW2_INIT, LOONGARCH_CSR_DMWIN2); 78 csr_write64(CSR_DMW3_INIT, LOONGARCH_CSR_DMWIN3); 79 80 real_kernel_entry = (void *)kernel_entry_address(kernel_addr, image); 81 82 real_kernel_entry(true, (unsigned long)cmdline_ptr, 83 (unsigned long)efi_system_table); 84 } 85