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 extern int kernel_asize;
16 extern int kernel_fsize;
17 extern int kernel_offset;
18 extern kernel_entry_t kernel_entry;
19
check_platform_features(void)20 efi_status_t check_platform_features(void)
21 {
22 return EFI_SUCCESS;
23 }
24
handle_kernel_image(unsigned long * image_addr,unsigned long * image_size,unsigned long * reserve_addr,unsigned long * reserve_size,efi_loaded_image_t * image,efi_handle_t image_handle)25 efi_status_t handle_kernel_image(unsigned long *image_addr,
26 unsigned long *image_size,
27 unsigned long *reserve_addr,
28 unsigned long *reserve_size,
29 efi_loaded_image_t *image,
30 efi_handle_t image_handle)
31 {
32 efi_status_t status;
33 unsigned long kernel_addr = 0;
34
35 kernel_addr = (unsigned long)&kernel_offset - kernel_offset;
36
37 status = efi_relocate_kernel(&kernel_addr, kernel_fsize, kernel_asize,
38 PHYSADDR(VMLINUX_LOAD_ADDRESS), SZ_2M, 0x0);
39
40 *image_addr = kernel_addr;
41 *image_size = kernel_asize;
42
43 return status;
44 }
45
46 struct exit_boot_struct {
47 efi_memory_desc_t *runtime_map;
48 int runtime_entry_count;
49 };
50
exit_boot_func(struct efi_boot_memmap * map,void * priv)51 static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv)
52 {
53 struct exit_boot_struct *p = priv;
54
55 /*
56 * Update the memory map with virtual addresses. The function will also
57 * populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
58 * entries so that we can pass it straight to SetVirtualAddressMap()
59 */
60 efi_get_virtmap(map->map, map->map_size, map->desc_size,
61 p->runtime_map, &p->runtime_entry_count);
62
63 return EFI_SUCCESS;
64 }
65
efi_boot_kernel(void * handle,efi_loaded_image_t * image,unsigned long kernel_addr,char * cmdline_ptr)66 efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image,
67 unsigned long kernel_addr, char *cmdline_ptr)
68 {
69 kernel_entry_t real_kernel_entry;
70 struct exit_boot_struct priv;
71 unsigned long desc_size;
72 efi_status_t status;
73 u32 desc_ver;
74
75 status = efi_alloc_virtmap(&priv.runtime_map, &desc_size, &desc_ver);
76 if (status != EFI_SUCCESS) {
77 efi_err("Unable to retrieve UEFI memory map.\n");
78 return status;
79 }
80
81 efi_info("Exiting boot services\n");
82
83 efi_novamap = false;
84 status = efi_exit_boot_services(handle, &priv, exit_boot_func);
85 if (status != EFI_SUCCESS)
86 return status;
87
88 /* Install the new virtual address map */
89 efi_rt_call(set_virtual_address_map,
90 priv.runtime_entry_count * desc_size, desc_size,
91 desc_ver, priv.runtime_map);
92
93 /* Config Direct Mapping */
94 csr_write64(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0);
95 csr_write64(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1);
96
97 real_kernel_entry = (kernel_entry_t)
98 ((unsigned long)&kernel_entry - kernel_addr + VMLINUX_LOAD_ADDRESS);
99
100 real_kernel_entry(true, (unsigned long)cmdline_ptr,
101 (unsigned long)efi_system_table);
102 }
103
