freebsd-dev/sys/boot/efi/libefi/efifs.c
2001-10-11 13:47:20 +00:00

353 lines
7.1 KiB
C

/*-
* Copyright (c) 2001 Doug Rabson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/time.h>
#include <stddef.h>
#include <stand.h>
#include <stdarg.h>
#include <efi.h>
#include <efilib.h>
#include "efiboot.h"
static int
efifs_open(const char *upath, struct open_file *f)
{
struct efi_devdesc *dev = f->f_devdata;
static EFI_GUID sfsid = SIMPLE_FILE_SYSTEM_PROTOCOL;
EFI_FILE_IO_INTERFACE *sfs;
EFI_FILE *root;
EFI_FILE *file;
EFI_STATUS status;
CHAR16 *cp;
CHAR16 *path;
if (!dev->d_handle)
return ENOENT;
status = BS->HandleProtocol(dev->d_handle, &sfsid, (VOID **)&sfs);
if (EFI_ERROR(status))
return ENOENT;
/*
* Find the root directory.
*/
status = sfs->OpenVolume(sfs, &root);
/*
* Convert path to CHAR16, skipping leading separators.
*/
while (*upath == '/')
upath++;
if (!*upath) {
/* Opening the root directory, */
f->f_fsdata = root;
return 0;
}
cp = path = malloc((strlen(upath) + 1) * sizeof(CHAR16));
if (path == NULL)
return ENOMEM;
while (*upath) {
if (*upath == '/')
*cp = '\\';
else
*cp = *upath;
upath++;
cp++;
}
*cp++ = 0;
/*
* Try to open it.
*/
status = root->Open(root, &file, path, EFI_FILE_MODE_READ, 0);
free(path);
if (EFI_ERROR(status)) {
root->Close(root);
return ENOENT;
}
root->Close(root);
f->f_fsdata = file;
return 0;
}
static int
efifs_close(struct open_file *f)
{
EFI_FILE *file = f->f_fsdata;
file->Close(file);
return 0;
}
static int
efifs_read(struct open_file *f, void *buf, size_t size, size_t *resid)
{
EFI_FILE *file = f->f_fsdata;
EFI_STATUS status;
UINTN sz = size;
char *bufp;
bufp = buf;
while (size > 0) {
sz = size;
if (sz > 8192)
sz = 8192;
status = file->Read(file, &sz, bufp);
twiddle();
if (EFI_ERROR(status))
return EIO;
if (sz == 0)
break;
size -= sz;
bufp += sz;
}
*resid = size;
return 0;
}
static off_t
efifs_seek(struct open_file *f, off_t offset, int where)
{
EFI_FILE *file = f->f_fsdata;
EFI_STATUS status;
UINT64 base;
UINTN sz;
static EFI_GUID infoid = EFI_FILE_INFO_ID;
EFI_FILE_INFO info;
switch (where) {
case SEEK_SET:
base = 0;
break;
case SEEK_CUR:
status = file->GetPosition(file, &base);
if (EFI_ERROR(status))
return -1;
break;
case SEEK_END:
sz = sizeof(info);
status = file->GetInfo(file, &infoid, &sz, &info);
if (EFI_ERROR(status))
return -1;
base = info.FileSize;
break;
}
status = file->SetPosition(file, base + offset);
if (EFI_ERROR(status))
return -1;
file->GetPosition(file, &base);
return base;
}
static int
efifs_stat(struct open_file *f, struct stat *sb)
{
EFI_FILE *file = f->f_fsdata;
EFI_STATUS status;
char *buf;
UINTN sz;
static EFI_GUID infoid = EFI_FILE_INFO_ID;
EFI_FILE_INFO *info;
bzero(sb, sizeof(*sb));
buf = malloc(1024);
sz = 1024;
status = file->GetInfo(file, &infoid, &sz, buf);
if (EFI_ERROR(status)) {
free(buf);
return -1;
}
info = (EFI_FILE_INFO *) buf;
if (info->Attribute & EFI_FILE_READ_ONLY)
sb->st_mode = S_IRUSR;
else
sb->st_mode = S_IRUSR | S_IWUSR;
if (info->Attribute & EFI_FILE_DIRECTORY)
sb->st_mode |= S_IFDIR;
sb->st_size = info->FileSize;
free(buf);
return 0;
}
static int
efifs_readdir(struct open_file *f, struct dirent *d)
{
EFI_FILE *file = f->f_fsdata;
EFI_STATUS status;
char *buf;
UINTN sz;
EFI_FILE_INFO *info;
int i;
buf = malloc(1024);
sz = 1024;
status = file->Read(file, &sz, buf);
if (EFI_ERROR(status) || sz < offsetof(EFI_FILE_INFO, FileName))
return ENOENT;
info = (EFI_FILE_INFO *) buf;
d->d_fileno = 0;
d->d_reclen = sizeof(*d);
if (info->Attribute & EFI_FILE_DIRECTORY)
d->d_type = DT_DIR;
else
d->d_type = DT_REG;
d->d_namlen = ((info->Size - offsetof(EFI_FILE_INFO, FileName))
/ sizeof(CHAR16));
for (i = 0; i < d->d_namlen; i++)
d->d_name[i] = info->FileName[i];
d->d_name[i] = 0;
free(buf);
return 0;
}
struct fs_ops efi_fsops = {
"fs",
efifs_open,
efifs_close,
efifs_read,
null_write,
efifs_seek,
efifs_stat,
efifs_readdir
};
static EFI_HANDLE *fs_handles;
UINTN fs_handle_count;;
static int
efifs_dev_init(void)
{
EFI_STATUS status;
UINTN sz;
static EFI_GUID sfsid = SIMPLE_FILE_SYSTEM_PROTOCOL;
sz = 0;
status = BS->LocateHandle(ByProtocol, &sfsid, 0, &sz, 0);
if (status != EFI_BUFFER_TOO_SMALL)
return ENOENT;
fs_handles = (EFI_HANDLE *) malloc(sz);
status = BS->LocateHandle(ByProtocol, &sfsid, 0,
&sz, fs_handles);
if (EFI_ERROR(status)) {
free(fs_handles);
return ENOENT;
}
fs_handle_count = sz / sizeof(EFI_HANDLE);
return 0;
}
/*
* Print information about disks
*/
static void
efifs_dev_print(int verbose)
{
int i;
char line[80];
for (i = 0; i < fs_handle_count; i++) {
sprintf(line, " fs%d: EFI filesystem", i);
pager_output(line);
/* XXX more detail? */
pager_output("\n");
}
}
/*
* Attempt to open the disk described by (dev) for use by (f).
*
* Note that the philosophy here is "give them exactly what
* they ask for". This is necessary because being too "smart"
* about what the user might want leads to complications.
* (eg. given no slice or partition value, with a disk that is
* sliced - are they after the first BSD slice, or the DOS
* slice before it?)
*/
static int
efifs_dev_open(struct open_file *f, ...)
{
va_list args;
struct efi_devdesc *dev;
int unit;
va_start(args, f);
dev = va_arg(args, struct efi_devdesc*);
va_end(args);
unit = dev->d_kind.efidisk.unit;
if (unit < 0 || unit >= fs_handle_count) {
printf("attempt to open nonexistent EFI filesystem\n");
return(ENXIO);
}
dev->d_handle = fs_handles[unit];
return 0;
}
static int
efifs_dev_close(struct open_file *f)
{
return 0;
}
static int
efifs_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
{
return 0;
}
struct devsw efifs_dev = {
"fs",
DEVT_DISK,
efifs_dev_init,
efifs_dev_strategy,
efifs_dev_open,
efifs_dev_close,
noioctl,
efifs_dev_print
};