2ab188f529
the S_IFREG bit for regular files. This caused the path search code to skip it when it finally did find the kernel (after the common/module.c buffer overrun bug was fixed)
388 lines
7.8 KiB
C
388 lines
7.8 KiB
C
/*-
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* Copyright (c) 2001 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/time.h>
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#include <stddef.h>
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#include <stand.h>
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#include <stdarg.h>
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#include <efi.h>
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#include <efilib.h>
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#include "efiboot.h"
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static int
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efifs_open(const char *upath, struct open_file *f)
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{
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struct efi_devdesc *dev = f->f_devdata;
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static EFI_GUID sfsid = SIMPLE_FILE_SYSTEM_PROTOCOL;
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EFI_FILE_IO_INTERFACE *sfs;
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EFI_FILE *root;
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EFI_FILE *file;
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EFI_STATUS status;
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CHAR16 *cp;
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CHAR16 *path;
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/*
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* We cannot blindly assume that f->f_devdata points to a
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* efi_devdesc structure. Before we dereference 'dev', make
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* sure that the underlying device is ours.
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*/
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if (f->f_dev != &efifs_dev || dev->d_handle == NULL)
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return ENOENT;
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status = BS->HandleProtocol(dev->d_handle, &sfsid, (VOID **)&sfs);
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if (EFI_ERROR(status))
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return ENOENT;
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/*
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* Find the root directory.
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*/
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status = sfs->OpenVolume(sfs, &root);
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/*
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* Convert path to CHAR16, skipping leading separators.
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*/
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while (*upath == '/')
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upath++;
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if (!*upath) {
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/* Opening the root directory, */
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f->f_fsdata = root;
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return 0;
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}
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cp = path = malloc((strlen(upath) + 1) * sizeof(CHAR16));
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if (path == NULL)
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return ENOMEM;
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while (*upath) {
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if (*upath == '/')
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*cp = '\\';
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else
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*cp = *upath;
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upath++;
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cp++;
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}
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*cp++ = 0;
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/*
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* Try to open it.
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*/
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status = root->Open(root, &file, path, EFI_FILE_MODE_READ, 0);
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free(path);
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if (EFI_ERROR(status)) {
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root->Close(root);
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return ENOENT;
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}
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root->Close(root);
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f->f_fsdata = file;
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return 0;
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}
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static int
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efifs_close(struct open_file *f)
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{
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EFI_FILE *file = f->f_fsdata;
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file->Close(file);
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return 0;
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}
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static int
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efifs_read(struct open_file *f, void *buf, size_t size, size_t *resid)
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{
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EFI_FILE *file = f->f_fsdata;
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EFI_STATUS status;
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UINTN sz = size;
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char *bufp;
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bufp = buf;
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while (size > 0) {
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sz = size;
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if (sz > 8192)
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sz = 8192;
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status = file->Read(file, &sz, bufp);
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twiddle();
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if (EFI_ERROR(status))
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return EIO;
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if (sz == 0)
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break;
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size -= sz;
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bufp += sz;
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}
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if (resid)
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*resid = size;
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return 0;
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}
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static int
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efifs_write(struct open_file *f, void *buf, size_t size, size_t *resid)
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{
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EFI_FILE *file = f->f_fsdata;
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EFI_STATUS status;
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UINTN sz = size;
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char *bufp;
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bufp = buf;
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while (size > 0) {
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sz = size;
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if (sz > 8192)
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sz = 8192;
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status = file->Write(file, &sz, bufp);
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twiddle();
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if (EFI_ERROR(status))
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return EIO;
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if (sz == 0)
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break;
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size -= sz;
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bufp += sz;
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}
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if (resid)
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*resid = size;
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return 0;
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}
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static off_t
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efifs_seek(struct open_file *f, off_t offset, int where)
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{
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EFI_FILE *file = f->f_fsdata;
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EFI_STATUS status;
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UINT64 base;
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UINTN sz;
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static EFI_GUID infoid = EFI_FILE_INFO_ID;
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EFI_FILE_INFO info;
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switch (where) {
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case SEEK_SET:
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base = 0;
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break;
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case SEEK_CUR:
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status = file->GetPosition(file, &base);
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if (EFI_ERROR(status))
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return -1;
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break;
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case SEEK_END:
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sz = sizeof(info);
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status = file->GetInfo(file, &infoid, &sz, &info);
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if (EFI_ERROR(status))
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return -1;
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base = info.FileSize;
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break;
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}
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status = file->SetPosition(file, base + offset);
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if (EFI_ERROR(status))
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return -1;
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file->GetPosition(file, &base);
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return base;
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}
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static int
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efifs_stat(struct open_file *f, struct stat *sb)
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{
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EFI_FILE *file = f->f_fsdata;
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EFI_STATUS status;
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char *buf;
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UINTN sz;
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static EFI_GUID infoid = EFI_FILE_INFO_ID;
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EFI_FILE_INFO *info;
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bzero(sb, sizeof(*sb));
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buf = malloc(1024);
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sz = 1024;
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status = file->GetInfo(file, &infoid, &sz, buf);
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if (EFI_ERROR(status)) {
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free(buf);
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return -1;
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}
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info = (EFI_FILE_INFO *) buf;
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if (info->Attribute & EFI_FILE_READ_ONLY)
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sb->st_mode = S_IRUSR;
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else
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sb->st_mode = S_IRUSR | S_IWUSR;
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if (info->Attribute & EFI_FILE_DIRECTORY)
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sb->st_mode |= S_IFDIR;
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else
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sb->st_mode |= S_IFREG;
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sb->st_size = info->FileSize;
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free(buf);
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return 0;
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}
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static int
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efifs_readdir(struct open_file *f, struct dirent *d)
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{
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EFI_FILE *file = f->f_fsdata;
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EFI_STATUS status;
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char *buf;
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UINTN sz;
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EFI_FILE_INFO *info;
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int i;
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buf = malloc(1024);
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sz = 1024;
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status = file->Read(file, &sz, buf);
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if (EFI_ERROR(status) || sz < offsetof(EFI_FILE_INFO, FileName))
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return ENOENT;
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info = (EFI_FILE_INFO *) buf;
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d->d_fileno = 0;
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d->d_reclen = sizeof(*d);
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if (info->Attribute & EFI_FILE_DIRECTORY)
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d->d_type = DT_DIR;
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else
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d->d_type = DT_REG;
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d->d_namlen = ((info->Size - offsetof(EFI_FILE_INFO, FileName))
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/ sizeof(CHAR16));
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for (i = 0; i < d->d_namlen; i++)
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d->d_name[i] = info->FileName[i];
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d->d_name[i] = 0;
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free(buf);
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return 0;
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}
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struct fs_ops efi_fsops = {
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"fs",
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efifs_open,
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efifs_close,
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efifs_read,
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efifs_write,
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efifs_seek,
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efifs_stat,
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efifs_readdir
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};
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static EFI_HANDLE *fs_handles;
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UINTN fs_handle_count;;
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static int
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efifs_dev_init(void)
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{
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EFI_STATUS status;
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UINTN sz;
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static EFI_GUID sfsid = SIMPLE_FILE_SYSTEM_PROTOCOL;
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sz = 0;
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status = BS->LocateHandle(ByProtocol, &sfsid, 0, &sz, 0);
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if (status != EFI_BUFFER_TOO_SMALL)
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return ENOENT;
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fs_handles = (EFI_HANDLE *) malloc(sz);
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status = BS->LocateHandle(ByProtocol, &sfsid, 0,
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&sz, fs_handles);
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if (EFI_ERROR(status)) {
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free(fs_handles);
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return ENOENT;
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}
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fs_handle_count = sz / sizeof(EFI_HANDLE);
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return 0;
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}
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/*
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* Print information about disks
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*/
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static void
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efifs_dev_print(int verbose)
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{
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int i;
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char line[80];
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for (i = 0; i < fs_handle_count; i++) {
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sprintf(line, " fs%d: EFI filesystem", i);
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pager_output(line);
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/* XXX more detail? */
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pager_output("\n");
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}
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}
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/*
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* Attempt to open the disk described by (dev) for use by (f).
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*
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* Note that the philosophy here is "give them exactly what
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* they ask for". This is necessary because being too "smart"
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* about what the user might want leads to complications.
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* (eg. given no slice or partition value, with a disk that is
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* sliced - are they after the first BSD slice, or the DOS
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* slice before it?)
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*/
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static int
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efifs_dev_open(struct open_file *f, ...)
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{
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va_list args;
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struct efi_devdesc *dev;
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int unit;
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va_start(args, f);
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dev = va_arg(args, struct efi_devdesc*);
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va_end(args);
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unit = dev->d_kind.efidisk.unit;
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if (unit < 0 || unit >= fs_handle_count) {
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printf("attempt to open nonexistent EFI filesystem\n");
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return(ENXIO);
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}
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dev->d_handle = fs_handles[unit];
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return 0;
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}
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static int
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efifs_dev_close(struct open_file *f)
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{
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return 0;
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}
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static int
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efifs_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
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{
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return 0;
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}
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struct devsw efifs_dev = {
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"fs",
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DEVT_DISK,
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efifs_dev_init,
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efifs_dev_strategy,
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efifs_dev_open,
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efifs_dev_close,
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noioctl,
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efifs_dev_print
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};
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