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
check_platform_features(void)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
exit_boot_func(struct efi_boot_memmap * map,void * priv)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
kernel_entry_address(unsigned long kernel_addr,efi_loaded_image_t * image)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
efi_boot_kernel(void * handle,efi_loaded_image_t * image,unsigned long kernel_addr,char * cmdline_ptr)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
78 real_kernel_entry = (void *)kernel_entry_address(kernel_addr, image);
79
80 real_kernel_entry(true, (unsigned long)cmdline_ptr,
81 (unsigned long)efi_system_table);
82 }
83