iPXE
efidrvprefix.c
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1 /*
2  * Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License as
6  * published by the Free Software Foundation; either version 2 of the
7  * License, or 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  * General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17  * 02110-1301, USA.
18  */
19 
20 FILE_LICENCE ( GPL2_OR_LATER );
21 
22 #include <stdlib.h>
23 #include <ipxe/init.h>
24 #include <ipxe/device.h>
25 #include <ipxe/efi/efi.h>
26 #include <ipxe/efi/efi_driver.h>
27 
28 /**
29  * EFI entry point
30  *
31  * @v image_handle Image handle
32  * @v systab System table
33  * @ret efirc EFI return status code
34  */
36  EFI_SYSTEM_TABLE *systab ) {
37  static struct efi_saved_tpl tpl; /* avoid triggering stack protector */
38  EFI_STATUS efirc;
39 
40  /* Initialise stack cookie */
41  efi_init_stack_guard ( image_handle );
42 
43  /* Initialise EFI environment */
44  if ( ( efirc = efi_init ( image_handle, systab ) ) != 0 )
45  return efirc;
46 
47  /* Raise TPL */
48  efi_raise_tpl ( &tpl );
49 
50  /* Initialise iPXE environment */
51  initialise();
52  startup();
53 
54  /* Restore TPL */
55  efi_restore_tpl ( &tpl );
56 
57  return 0;
58 }
59 
60 /**
61  * Probe EFI root bus
62  *
63  * @v rootdev EFI root device
64  */
65 static int efi_probe ( struct root_device *rootdev __unused ) {
66 
67  /* Do nothing */
68  return 0;
69 }
70 
71 /**
72  * Remove EFI root bus
73  *
74  * @v rootdev EFI root device
75  */
76 static void efi_remove ( struct root_device *rootdev __unused ) {
77 
79 }
80 
81 /** EFI root device driver */
82 static struct root_driver efi_root_driver = {
83  .probe = efi_probe,
84  .remove = efi_remove,
85 };
86 
87 /** EFI root device */
88 struct root_device efi_root_device __root_device = {
89  .dev = { .name = "EFI" },
90  .driver = &efi_root_driver,
91 };
static void efi_init_stack_guard(EFI_HANDLE handle)
Initialise stack cookie.
Definition: efi.h:326
EFI driver interface.
FILE_LICENCE(GPL2_OR_LATER)
void efi_raise_tpl(struct efi_saved_tpl *tpl)
Raise task priority level to TPL_CALLBACK.
Definition: efi_init.c:373
static struct root_driver efi_root_driver
EFI root device driver.
Definition: efidrvprefix.c:82
char name[40]
Name.
Definition: device.h:75
A root device.
Definition: device.h:94
struct device dev
Device chain.
Definition: device.h:99
void initialise(void)
Initialise iPXE.
Definition: init.c:52
EFI_STATUS EFIAPI _efidrv_start(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *systab)
EFI entry point.
Definition: efidrvprefix.c:35
#define EFIAPI
void efi_driver_disconnect_all(void)
Disconnect EFI driver from all possible devices.
Definition: efi_driver.c:584
static void efi_remove(struct root_device *rootdev __unused)
Remove EFI root bus.
Definition: efidrvprefix.c:76
static int efi_probe(struct root_device *rootdev __unused)
Probe EFI root bus.
Definition: efidrvprefix.c:65
A root device driver.
Definition: device.h:107
EFI System Table.
Definition: UefiSpec.h:1949
int(* probe)(struct root_device *rootdev)
Add root device.
Definition: device.h:116
EFI API.
#define __unused
Declare a variable or data structure as unused.
Definition: compiler.h:573
An EFI saved task priority level.
Definition: efi.h:72
struct root_device efi_root_device __root_device
EFI root device.
Definition: efidrvprefix.c:88
RETURN_STATUS EFI_STATUS
Function return status for EFI API.
Definition: UefiBaseType.h:35
Device model.
EFI_STATUS efi_init(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *systab)
Initialise EFI environment.
Definition: efi_init.c:156
void efi_restore_tpl(struct efi_saved_tpl *tpl)
Restore task priority level.
Definition: efi_init.c:389
Definition: efi.h:55
void startup(void)
Start up iPXE.
Definition: init.c:67