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 void efi_cache_sync_image(unsigned long image_base, unsigned long alloc_size) 22 { 23 asm volatile ("ibar 0" ::: "memory"); 24 } 25 26 struct exit_boot_struct { 27 efi_memory_desc_t *runtime_map; 28 int runtime_entry_count; 29 }; 30 31 static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv) 32 { 33 struct exit_boot_struct *p = priv; 34 35 /* 36 * Update the memory map with virtual addresses. The function will also 37 * populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME 38 * entries so that we can pass it straight to SetVirtualAddressMap() 39 */ 40 efi_get_virtmap(map->map, map->map_size, map->desc_size, 41 p->runtime_map, &p->runtime_entry_count); 42 43 return EFI_SUCCESS; 44 } 45 46 unsigned long __weak kernel_entry_address(unsigned long kernel_addr, 47 efi_loaded_image_t *image) 48 { 49 return *(unsigned long *)(kernel_addr + 8) - PHYSADDR(VMLINUX_LOAD_ADDRESS) + kernel_addr; 50 } 51 52 efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image, 53 unsigned long kernel_addr, char *cmdline_ptr) 54 { 55 kernel_entry_t real_kernel_entry; 56 struct exit_boot_struct priv; 57 unsigned long desc_size; 58 efi_status_t status; 59 u32 desc_ver; 60 61 status = efi_alloc_virtmap(&priv.runtime_map, &desc_size, &desc_ver); 62 if (status != EFI_SUCCESS) { 63 efi_err("Unable to retrieve UEFI memory map.\n"); 64 return status; 65 } 66 67 efi_info("Exiting boot services\n"); 68 69 efi_novamap = false; 70 status = efi_exit_boot_services(handle, &priv, exit_boot_func); 71 if (status != EFI_SUCCESS) 72 return status; 73 74 /* Install the new virtual address map */ 75 efi_rt_call(set_virtual_address_map, 76 priv.runtime_entry_count * desc_size, desc_size, 77 desc_ver, priv.runtime_map); 78 79 /* Config Direct Mapping */ 80 csr_write(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0); 81 csr_write(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1); 82 csr_write(CSR_DMW2_INIT, LOONGARCH_CSR_DMWIN2); 83 csr_write(CSR_DMW3_INIT, LOONGARCH_CSR_DMWIN3); 84 85 real_kernel_entry = (void *)kernel_entry_address(kernel_addr, image); 86 87 real_kernel_entry(true, (unsigned long)cmdline_ptr, 88 (unsigned long)efi_system_table); 89 } 90