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1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 /*
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU Lesser General Public License as published by
6 * the Free Software Foundation; either version 2.1 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * Copyright (C) 2015 Kay Sievers <kay@vrfy.org>
15 */
16
17 #include <efi.h>
18 #include <efilib.h>
19
20 #include "linux.h"
21 #include "util.h"
22
23 #define SETUP_MAGIC 0x53726448 /* "HdrS" */
24 struct SetupHeader {
25 UINT8 boot_sector[0x01f1];
26 UINT8 setup_secs;
27 UINT16 root_flags;
28 UINT32 sys_size;
29 UINT16 ram_size;
30 UINT16 video_mode;
31 UINT16 root_dev;
32 UINT16 signature;
33 UINT16 jump;
34 UINT32 header;
35 UINT16 version;
36 UINT16 su_switch;
37 UINT16 setup_seg;
38 UINT16 start_sys;
39 UINT16 kernel_ver;
40 UINT8 loader_id;
41 UINT8 load_flags;
42 UINT16 movesize;
43 UINT32 code32_start;
44 UINT32 ramdisk_start;
45 UINT32 ramdisk_len;
46 UINT32 bootsect_kludge;
47 UINT16 heap_end;
48 UINT8 ext_loader_ver;
49 UINT8 ext_loader_type;
50 UINT32 cmd_line_ptr;
51 UINT32 ramdisk_max;
52 UINT32 kernel_alignment;
53 UINT8 relocatable_kernel;
54 UINT8 min_alignment;
55 UINT16 xloadflags;
56 UINT32 cmdline_size;
57 UINT32 hardware_subarch;
58 UINT64 hardware_subarch_data;
59 UINT32 payload_offset;
60 UINT32 payload_length;
61 UINT64 setup_data;
62 UINT64 pref_address;
63 UINT32 init_size;
64 UINT32 handover_offset;
65 } __attribute__((packed));
66
67 #ifdef __x86_64__
68 typedef VOID(*handover_f)(VOID *image, EFI_SYSTEM_TABLE *table, struct SetupHeader *setup);
69 static inline VOID linux_efi_handover(EFI_HANDLE image, struct SetupHeader *setup) {
70 handover_f handover;
71
72 asm volatile ("cli");
73 handover = (handover_f)((UINTN)setup->code32_start + 512 + setup->handover_offset);
74 handover(image, ST, setup);
75 }
76 #else
77 typedef VOID(*handover_f)(VOID *image, EFI_SYSTEM_TABLE *table, struct SetupHeader *setup) __attribute__((regparm(0)));
78 static inline VOID linux_efi_handover(EFI_HANDLE image, struct SetupHeader *setup) {
79 handover_f handover;
80
81 handover = (handover_f)((UINTN)setup->code32_start + setup->handover_offset);
82 handover(image, ST, setup);
83 }
84 #endif
85
86 EFI_STATUS linux_exec(EFI_HANDLE *image,
87 CHAR8 *cmdline, UINTN cmdline_len,
88 UINTN linux_addr,
89 UINTN initrd_addr, UINTN initrd_size) {
90 struct SetupHeader *image_setup;
91 struct SetupHeader *boot_setup;
92 EFI_PHYSICAL_ADDRESS addr;
93 EFI_STATUS err;
94
95 image_setup = (struct SetupHeader *)(linux_addr);
96 if (image_setup->signature != 0xAA55 || image_setup->header != SETUP_MAGIC)
97 return EFI_LOAD_ERROR;
98
99 if (image_setup->version < 0x20b || !image_setup->relocatable_kernel)
100 return EFI_LOAD_ERROR;
101
102 addr = 0x3fffffff;
103 err = uefi_call_wrapper(BS->AllocatePages, 4, AllocateMaxAddress, EfiLoaderData,
104 EFI_SIZE_TO_PAGES(0x4000), &addr);
105 if (EFI_ERROR(err))
106 return err;
107 boot_setup = (struct SetupHeader *)(UINTN)addr;
108 ZeroMem(boot_setup, 0x4000);
109 CopyMem(boot_setup, image_setup, sizeof(struct SetupHeader));
110 boot_setup->loader_id = 0xff;
111
112 boot_setup->code32_start = (UINT32)linux_addr + (image_setup->setup_secs+1) * 512;
113
114 if (cmdline) {
115 addr = 0xA0000;
116 err = uefi_call_wrapper(BS->AllocatePages, 4, AllocateMaxAddress, EfiLoaderData,
117 EFI_SIZE_TO_PAGES(cmdline_len + 1), &addr);
118 if (EFI_ERROR(err))
119 return err;
120 CopyMem((VOID *)(UINTN)addr, cmdline, cmdline_len);
121 ((CHAR8 *)addr)[cmdline_len] = 0;
122 boot_setup->cmd_line_ptr = (UINT32)addr;
123 }
124
125 boot_setup->ramdisk_start = (UINT32)initrd_addr;
126 boot_setup->ramdisk_len = (UINT32)initrd_size;
127
128 linux_efi_handover(image, boot_setup);
129 return EFI_LOAD_ERROR;
130 }