This implements a filesystem driver which uses the EFI Simple File System Protocol to provide files from EFI to barebox.
Signed-off-by: Sascha Hauer <[email protected]> --- fs/Kconfig | 8 + fs/Makefile | 1 + fs/efi.c | 559 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 568 insertions(+) create mode 100644 fs/efi.c diff --git a/fs/Kconfig b/fs/Kconfig index 3724b34..21690de 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -41,6 +41,14 @@ config FS_NFS bool prompt "nfs support" +config FS_EFI + depends on ARCH_EFI + bool + prompt "EFI filesystem support" + help + This filesystem driver provides access to the filesystems provided + by the EFI Firmware via the EFI Simple File System Protocol. + source fs/fat/Kconfig source fs/ubifs/Kconfig diff --git a/fs/Makefile b/fs/Makefile index d3465ed..f027851 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -11,3 +11,4 @@ obj-$(CONFIG_FS_OMAP4_USBBOOT) += omap4_usbbootfs.o obj-$(CONFIG_FS_NFS) += nfs.o parseopt.o obj-$(CONFIG_FS_BPKFS) += bpkfs.o obj-$(CONFIG_FS_UIMAGEFS) += uimagefs.o +obj-$(CONFIG_FS_EFI) += efi.o diff --git a/fs/efi.c b/fs/efi.c new file mode 100644 index 0000000..cea1dda --- /dev/null +++ b/fs/efi.c @@ -0,0 +1,559 @@ +/* + * efi.c - EFI filesystem mirror driver + * + * Copyright (c) 2014 Sascha Hauer <[email protected]>, Pengutronix + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <common.h> +#include <driver.h> +#include <init.h> +#include <malloc.h> +#include <fs.h> +#include <string.h> +#include <command.h> +#include <errno.h> +#include <linux/stat.h> +#include <xfuncs.h> +#include <fcntl.h> +#include <wchar.h> +#include <efi.h> +#include <mach/efi.h> +#include <mach/efi-device.h> + +/* Open modes */ +#define EFI_FILE_MODE_READ 0x0000000000000001 +#define EFI_FILE_MODE_WRITE 0x0000000000000002 +#define EFI_FILE_MODE_CREATE 0x8000000000000000 + +/* File attributes */ +#define EFI_FILE_READ_ONLY 0x0000000000000001 +#define EFI_FILE_HIDDEN 0x0000000000000002 +#define EFI_FILE_SYSTEM 0x0000000000000004 +#define EFI_FILE_RESERVIED 0x0000000000000008 +#define EFI_FILE_DIRECTORY 0x0000000000000010 +#define EFI_FILE_ARCHIVE 0x0000000000000020 +#define EFI_FILE_VALID_ATTR 0x0000000000000037 + +#define EFI_FILE_HANDLE_REVISION 0x00010000 +struct efi_file_handle { + uint64_t Revision; + efi_status_t(EFIAPI *open)(struct efi_file_handle *File, + struct efi_file_handle **NewHandle, s16 *FileName, + uint64_t OpenMode, uint64_t Attributes); + efi_status_t(EFIAPI *close)(struct efi_file_handle *File); + efi_status_t(EFIAPI *delete)(struct efi_file_handle *File); + efi_status_t(EFIAPI *read)(struct efi_file_handle *File, unsigned long *BufferSize, + void *Buffer); + efi_status_t(EFIAPI *write)(struct efi_file_handle *File, + unsigned long *BufferSize, void *Buffer); + efi_status_t(EFIAPI *get_position)(struct efi_file_handle *File, + uint64_t *Position); + efi_status_t(EFIAPI *set_position)(struct efi_file_handle *File, + uint64_t Position); + efi_status_t(EFIAPI *get_info)(struct efi_file_handle *File, + efi_guid_t *InformationType, unsigned long *BufferSize, + void *Buffer); + efi_status_t(EFIAPI *set_info)(struct efi_file_handle *File, + efi_guid_t *InformationType, unsigned long BufferSize, + void *Buffer); + efi_status_t(EFIAPI *flush)(struct efi_file_handle *File); +}; + +#define EFI_FILE_IO_INTERFACE_REVISION 0x00010000 + +struct efi_file_io_interface { + uint64_t Revision; + efi_status_t(EFIAPI *open_volume)( + struct efi_file_io_interface *This, + struct efi_file_handle **Root); +}; + +struct efi_file_info { + uint64_t Size; + uint64_t FileSize; + uint64_t PhysicalSize; + efi_time_t CreateTime; + efi_time_t LastAccessTime; + efi_time_t ModificationTime; + uint64_t Attribute; + s16 FileName[1]; +}; + +typedef unsigned short wchar_t; + +struct efifs_priv { + struct efi_file_handle *root_dir; + struct efi_file_io_interface *protocol; +}; + +struct efifs_file { + struct efi_file_handle *entry; +}; + +struct efifs_dir { + DIR dir; + struct efi_file_handle *entries; +}; + +static wchar_t *path_to_efi(const char *path) +{ + wchar_t *dst = strdup_char_to_wchar(path); + wchar_t *ret; + + if (!dst) + return NULL; + + ret = dst; + + while (*dst) { + if (*dst == '/') + *dst = '\\'; + dst++; + } + + return ret; +} + +static int efifs_create(struct device_d *dev, const char *pathname, mode_t mode) +{ + struct efifs_priv *priv = dev->priv; + wchar_t *efi_path = path_to_efi(pathname); + struct efi_file_handle *entry; + efi_status_t efiret; + + efiret = priv->root_dir->open(priv->root_dir, &entry, efi_path, + EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_CREATE, + 0ULL); + + free(efi_path); + + if (EFI_ERROR(efiret)) { + printf("%s %s: %s\n", __func__, pathname, efi_strerror(efiret)); + return -efi_errno(efiret); + } + + entry->close(entry); + + return 0; +} + +static int efifs_unlink(struct device_d *dev, const char *pathname) +{ + struct efifs_priv *priv = dev->priv; + wchar_t *efi_path = path_to_efi(pathname); + struct efi_file_handle *entry; + efi_status_t efiret; + + efiret = priv->root_dir->open(priv->root_dir, &entry, efi_path, + EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE, 0ULL); + + free(efi_path); + + if (EFI_ERROR(efiret)) + return -efi_errno(efiret); + + efiret = entry->delete(entry); + if (EFI_ERROR(efiret)) + return -efi_errno(efiret); + + return 0; +} + +static int efifs_mkdir(struct device_d *dev, const char *pathname) +{ + struct efifs_priv *priv = dev->priv; + wchar_t *efi_path = path_to_efi(pathname); + struct efi_file_handle *entry; + efi_status_t efiret; + + efiret = priv->root_dir->open(priv->root_dir, &entry, efi_path, + EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_CREATE, + EFI_FILE_DIRECTORY); + + free(efi_path); + + if (EFI_ERROR(efiret)) { + printf("%s %s: %s\n", __func__, pathname, efi_strerror(efiret)); + return -efi_errno(efiret); + } + + entry->close(entry); + + return 0; +} + +static int efifs_rmdir(struct device_d *dev, const char *pathname) +{ + return efifs_unlink(dev, pathname); +} + +static int efifs_open(struct device_d *dev, FILE *f, const char *filename) +{ + struct efifs_priv *priv = dev->priv; + efi_status_t efiret; + struct efifs_file *ufile; + wchar_t *efi_path = path_to_efi(filename); + struct efi_file_info *info; + unsigned long bufsize = 1024; + uint64_t efimode = EFI_FILE_MODE_READ; + int ret; + + ufile = xzalloc(sizeof(*ufile)); + + if (f->flags & O_ACCMODE) + efimode |= EFI_FILE_MODE_WRITE; + + efiret = priv->root_dir->open(priv->root_dir, &ufile->entry, efi_path, + efimode, 0ULL); + if (EFI_ERROR(efiret)) { + pr_err("%s: unable to Open %s: %s\n", __func__, + filename, efi_strerror(efiret)); + free(ufile); + return -efi_errno(efiret); + } + + free(efi_path); + + info = xzalloc(1024); + efiret = ufile->entry->get_info(ufile->entry, &efi_file_info_id, &bufsize, info); + if (EFI_ERROR(efiret)) { + pr_err("%s: unable to GetInfo %s: %s\n", __func__, + filename, efi_strerror(efiret)); + ret = -efi_errno(efiret); + goto out; + } + + f->size = info->FileSize; + + free(info); + f->inode = ufile; + + return 0; +out: + free(info); + free(ufile); + return ret; +} + +static int efifs_close(struct device_d *dev, FILE *f) +{ + struct efifs_file *ufile = f->inode; + + ufile->entry->close(ufile->entry); + + free(ufile); + + return 0; +} + +static int efifs_read(struct device_d *_dev, FILE *f, void *buf, size_t insize) +{ + struct efifs_file *ufile = f->inode; + efi_status_t efiret; + unsigned long bufsize = insize; + + efiret = ufile->entry->read(ufile->entry, &bufsize, buf); + if (EFI_ERROR(efiret)) { + return -efi_errno(efiret); + } + + return bufsize; +} + +static int efifs_write(struct device_d *_dev, FILE *f, const void *buf, size_t insize) +{ + struct efifs_file *ufile = f->inode; + efi_status_t efiret; + unsigned long bufsize = insize; + + efiret = ufile->entry->write(ufile->entry, &bufsize, (void *)buf); + if (EFI_ERROR(efiret)) { + pr_err("%s: unable to write: %s\n", __func__, efi_strerror(efiret)); + return -efi_errno(efiret); + } + + return bufsize; +} + +static loff_t efifs_lseek(struct device_d *dev, FILE *f, loff_t pos) +{ + struct efifs_file *ufile = f->inode; + efi_status_t efiret; + + f->pos = pos; + + efiret = ufile->entry->set_position(ufile->entry, pos); + if (EFI_ERROR(efiret)) { + return -efi_errno(efiret); + } + + return f->pos; +} + +static int efifs_truncate(struct device_d *dev, FILE *f, unsigned long size) +{ + struct efifs_file *ufile = f->inode; + efi_status_t efiret; + struct efi_file_info *info; + unsigned long bufsize = 1024; + int ret; + + info = xzalloc(1024); + + efiret = ufile->entry->get_info(ufile->entry, &efi_file_info_id, &bufsize, info); + if (EFI_ERROR(efiret)) { + pr_err("%s: unable to GetInfo: %s\n", __func__, efi_strerror(efiret)); + ret = -efi_errno(efiret); + goto out; + } + + if (size > info->FileSize) + return 0; + + info->FileSize = size; + + efiret = ufile->entry->set_info(ufile->entry, &efi_file_info_id, bufsize, info); + if (EFI_ERROR(efiret)) { + pr_err("%s: unable to SetInfo: %s\n", __func__, efi_strerror(efiret)); + ret = -efi_errno(efiret); + goto out; + } + + return 0; +out: + return ret; +} + +static DIR *efifs_opendir(struct device_d *dev, const char *pathname) +{ + struct efifs_priv *priv = dev->priv; + efi_status_t efiret; + struct efifs_dir *udir; + wchar_t *efi_path = path_to_efi(pathname); + + udir = xzalloc(sizeof(*udir)); + + efiret = priv->root_dir->open(priv->root_dir, &udir->entries, efi_path, EFI_FILE_MODE_READ, 0ULL); + if (EFI_ERROR(efiret)) { + free(udir); + return NULL; + } + + free(efi_path); + + return &udir->dir; +} + +static struct dirent *efifs_readdir(struct device_d *dev, DIR *dir) +{ + struct efifs_dir *udir = container_of(dir, struct efifs_dir, dir); + efi_status_t efiret; + unsigned long bufsize = 256; + s16 buf[256]; + struct efi_file_info *f; + + efiret = udir->entries->read(udir->entries, &bufsize, buf); + if (EFI_ERROR(efiret) || bufsize == 0) + return NULL; + + f = (struct efi_file_info *)buf; + + strcpy_wchar_to_char(dir->d.d_name, f->FileName); + + return &dir->d; +} + +static int efifs_closedir(struct device_d *dev, DIR *dir) +{ + struct efifs_dir *udir = container_of(dir, struct efifs_dir, dir); + + udir->entries->close(udir->entries); + + free(dir); + + return 0; +} + +static int efifs_stat(struct device_d *dev, const char *filename, struct stat *s) +{ + struct efifs_priv *priv = dev->priv; + wchar_t *efi_path; + efi_status_t efiret; + struct efi_file_handle *entry; + struct efi_file_info *info; + unsigned long bufsize = 1024; + int ret; + + info = xzalloc(1024); + + efi_path = path_to_efi(filename); + + efiret = priv->root_dir->open(priv->root_dir, &entry, efi_path, EFI_FILE_MODE_READ, 0ULL); + if (EFI_ERROR(efiret)) { + pr_err("%s: unable to Open %s: %s\n", __func__, filename, + efi_strerror(efiret)); + ret = -efi_errno(efiret); + goto out_free; + } + + efiret = entry->get_info(entry, &efi_file_info_id, &bufsize, info); + if (EFI_ERROR(efiret)) { + pr_err("%s: unable to GetInfo %s: %s\n", __func__, filename, + efi_strerror(efiret)); + ret = -efi_errno(efiret); + goto out; + } + + s->st_size = info->FileSize; + s->st_mode = 00555; + + if (!info->Attribute & EFI_FILE_READ_ONLY) + s->st_mode |= 00222; + + if (info->Attribute & EFI_FILE_DIRECTORY) + s->st_mode |= S_IFDIR; + else + s->st_mode |= S_IFREG; + + ret = 0; +out: + entry->close(entry); +out_free: + free(efi_path); + free(info); + + return ret; +} + +static int efifs_symlink(struct device_d *dev, const char *pathname, + const char *newpath) +{ + return -EROFS; +} + +static int efifs_readlink(struct device_d *dev, const char *pathname, + char *buf, size_t bufsiz) +{ + return -ENOENT; +} + +static int efifs_probe(struct device_d *dev) +{ + struct fs_device_d *fsdev = dev_to_fs_device(dev); + struct efifs_priv *priv; + efi_status_t efiret; + struct efi_file_handle *file; + struct device_d *efi = get_device_by_name(fsdev->backingstore); + struct efi_device *udev = container_of(efi, struct efi_device, dev); + + priv = xzalloc(sizeof(struct efifs_priv)); + priv->protocol = udev->protocol; + dev->priv = priv; + dev->parent = &udev->dev; + + efiret = priv->protocol->open_volume(priv->protocol, &file); + if (EFI_ERROR(efiret)) { + dev_err(dev, "failed to open volume: %s\n", efi_strerror(efiret)); + return -efi_errno(efiret); + } + + priv->root_dir = file; + + return 0; +} + +static void efifs_remove(struct device_d *dev) +{ + free(dev->priv); +} + +static struct fs_driver_d efifs_driver = { + .create = efifs_create, + .unlink = efifs_unlink, + .open = efifs_open, + .close = efifs_close, + .truncate = efifs_truncate, + .read = efifs_read, + .write = efifs_write, + .lseek = efifs_lseek, + .mkdir = efifs_mkdir, + .rmdir = efifs_rmdir, + .opendir = efifs_opendir, + .readdir = efifs_readdir, + .closedir = efifs_closedir, + .stat = efifs_stat, + .symlink = efifs_symlink, + .readlink = efifs_readlink, + .drv = { + .probe = efifs_probe, + .remove = efifs_remove, + .name = "efifs", + } +}; + +static int efifs_init(void) +{ + return register_fs_driver(&efifs_driver); +} + +coredevice_initcall(efifs_init); + +static int index; + +int efi_fs_probe(struct efi_device *efidev) +{ + char *path, *device; + int ret; + struct efi_file_io_interface *volume; + + if (efi_loaded_image) + BS->handle_protocol(efi_loaded_image->device_handle, + &efi_simple_file_system_protocol_guid, (void*)&volume); + + if (efidev->protocol == volume) + path = xstrdup("/boot"); + else + path = asprintf("/efi%d", index); + device = asprintf("%s", dev_name(&efidev->dev)); + + ret = make_directory(path); + if (ret) + goto out; + + ret = mount(device, "efifs", path, NULL); + if (ret) + goto out; + + index++; + + dev_info(&efidev->dev, "mounted on %s\n", path); + + ret = 0; +out: + free(path); + free(device); + + return ret; +} + +static struct efi_driver efi_fs_driver = { + .driver = { + .name = "efi-fs", + }, + .probe = efi_fs_probe, + .guid = EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID, +}; +device_efi_driver(efi_fs_driver); 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