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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v2 05/12] mini-os: use alloc_file_type() and get_file_from_fd() in tpmfront
Allocate a file type dynamically via alloc_file_type().
Instead of directly accessing the files[] array use get_file_from_fd().
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
include/lib.h | 3 +-
include/tpmfront.h | 5 ---
lib/sys.c | 23 -----------
tpmfront.c | 100 ++++++++++++++++++++++++++++++++-------------
4 files changed, 72 insertions(+), 59 deletions(-)
diff --git a/include/lib.h b/include/lib.h
index d94d142..f6478de 100644
--- a/include/lib.h
+++ b/include/lib.h
@@ -165,8 +165,7 @@ void sanity_check(void);
#define FTYPE_KBD 7
#define FTYPE_TAP 8
#define FTYPE_BLK 9
-#define FTYPE_TPMFRONT 10
-#define FTYPE_N 11
+#define FTYPE_N 10
#define FTYPE_SPARE 16
typedef int file_read_func(int fd, void *buf, size_t nbytes);
diff --git a/include/tpmfront.h b/include/tpmfront.h
index b7da50e..a527371 100644
--- a/include/tpmfront.h
+++ b/include/tpmfront.h
@@ -81,7 +81,6 @@ int tpmfront_cmd(struct tpmfront_dev* dev, uint8_t* req,
size_t reqlen, uint8_t*
int tpmfront_set_locality(struct tpmfront_dev* dev, int locality);
#ifdef HAVE_LIBC
-#include <sys/stat.h>
/* POSIX IO functions:
* use tpmfront_open() to get a file descriptor to the tpm device
* use write() on the fd to send a command to the backend. You must
@@ -90,10 +89,6 @@ int tpmfront_set_locality(struct tpmfront_dev* dev, int
locality);
* fstat() to get the size of the response and lseek() to seek on it.
*/
int tpmfront_open(struct tpmfront_dev* dev);
-int tpmfront_posix_read(int fd, uint8_t* buf, size_t count);
-int tpmfront_posix_write(int fd, const uint8_t* buf, size_t count);
-int tpmfront_posix_fstat(int fd, struct stat* buf);
#endif
-
#endif
diff --git a/lib/sys.c b/lib/sys.c
index 4060b42..ff6be52 100644
--- a/lib/sys.c
+++ b/lib/sys.c
@@ -28,7 +28,6 @@
#include <netfront.h>
#include <blkfront.h>
#include <fbfront.h>
-#include <tpmfront.h>
#include <xenbus.h>
#include <xenstore.h>
#include <poll.h>
@@ -343,11 +342,6 @@ int read(int fd, void *buf, size_t nbytes)
case FTYPE_BLK: {
return blkfront_posix_read(fd, buf, nbytes);
}
-#endif
-#ifdef CONFIG_TPMFRONT
- case FTYPE_TPMFRONT: {
- return tpmfront_posix_read(fd, buf, nbytes);
- }
#endif
default:
break;
@@ -389,10 +383,6 @@ int write(int fd, const void *buf, size_t nbytes)
#ifdef CONFIG_BLKFRONT
case FTYPE_BLK:
return blkfront_posix_write(fd, buf, nbytes);
-#endif
-#ifdef CONFIG_TPMFRONT
- case FTYPE_TPMFRONT:
- return tpmfront_posix_write(fd, buf, nbytes);
#endif
default:
break;
@@ -445,10 +435,6 @@ off_t lseek(int fd, off_t offset, int whence)
#ifdef CONFIG_BLKFRONT
case FTYPE_BLK:
break;
-#endif
-#ifdef CONFIG_TPMFRONT
- case FTYPE_TPMFRONT:
- break;
#endif
case FTYPE_FILE:
break;
@@ -496,11 +482,6 @@ int close(int fd)
shutdown_blkfront(files[fd].dev);
break;
#endif
-#ifdef CONFIG_TPMFRONT
- case FTYPE_TPMFRONT:
- shutdown_tpmfront(files[fd].dev);
- break;
-#endif
#ifdef CONFIG_KBDFRONT
case FTYPE_KBD:
shutdown_kbdfront(files[fd].dev);
@@ -576,10 +557,6 @@ int fstat(int fd, struct stat *buf)
#ifdef CONFIG_BLKFRONT
case FTYPE_BLK:
return blkfront_posix_fstat(fd, buf);
-#endif
-#ifdef CONFIG_TPMFRONT
- case FTYPE_TPMFRONT:
- return tpmfront_posix_fstat(fd, buf);
#endif
default:
break;
diff --git a/tpmfront.c b/tpmfront.c
index 0a2fefc..a19a052 100644
--- a/tpmfront.c
+++ b/tpmfront.c
@@ -49,6 +49,10 @@
void tpmfront_handler(evtchn_port_t port, struct pt_regs *regs, void *data) {
struct tpmfront_dev* dev = (struct tpmfront_dev*) data;
tpmif_shared_page_t *shr = dev->page;
+#ifdef HAVE_LIBC
+ struct file *file = get_file_from_fd(dev->fd);
+#endif
+
/*If we get a response when we didnt make a request, just ignore it */
if(!dev->waiting) {
return;
@@ -65,8 +69,9 @@ void tpmfront_handler(evtchn_port_t port, struct pt_regs
*regs, void *data) {
dev->waiting = 0;
#ifdef HAVE_LIBC
- if(dev->fd >= 0) {
- files[dev->fd].read = true;
+ if ( file )
+ {
+ file->read = true;
}
#endif
wake_up(&dev->waitq);
@@ -405,6 +410,10 @@ int tpmfront_send(struct tpmfront_dev* dev, const uint8_t*
msg, size_t length)
#ifdef TPMFRONT_PRINT_DEBUG
int i;
#endif
+#ifdef HAVE_LIBC
+ struct file *file = dev ? get_file_from_fd(dev->fd) : NULL;
+#endif
+
/* Error Checking */
if(dev == NULL || dev->state != XenbusStateConnected) {
TPMFRONT_ERR("Tried to send message through disconnected frontend\n");
@@ -437,9 +446,10 @@ int tpmfront_send(struct tpmfront_dev* dev, const uint8_t*
msg, size_t length)
dev->waiting = 1;
dev->resplen = 0;
#ifdef HAVE_LIBC
- if(dev->fd >= 0) {
- files[dev->fd].read = false;
- files[dev->fd].offset = 0;
+ if ( file )
+ {
+ file->read = false;
+ file->offset = 0;
dev->respgot = false;
}
#endif
@@ -529,25 +539,14 @@ int tpmfront_set_locality(struct tpmfront_dev* dev, int
locality)
#ifdef HAVE_LIBC
#include <errno.h>
-int tpmfront_open(struct tpmfront_dev* dev)
-{
- /* Silently prevent multiple opens */
- if(dev->fd != -1) {
- return dev->fd;
- }
- dev->fd = alloc_fd(FTYPE_TPMFRONT);
- printk("tpmfront_open(%s) -> %d\n", dev->nodename, dev->fd);
- files[dev->fd].dev = dev;
- dev->respgot = false;
- return dev->fd;
-}
-
-int tpmfront_posix_write(int fd, const uint8_t* buf, size_t count)
+static int tpmfront_posix_write(int fd, const void *buf, size_t count)
{
int rc;
struct tpmfront_dev* dev;
- dev = files[fd].dev;
+ struct file *file = get_file_from_fd(fd);
+
+ dev = file->dev;
if(count == 0) {
return 0;
@@ -566,14 +565,15 @@ int tpmfront_posix_write(int fd, const uint8_t* buf,
size_t count)
return count;
}
-int tpmfront_posix_read(int fd, uint8_t* buf, size_t count)
+static int tpmfront_posix_read(int fd, void *buf, size_t count)
{
int rc;
uint8_t* dummybuf;
size_t dummysz;
struct tpmfront_dev* dev;
+ struct file *file = get_file_from_fd(fd);
- dev = files[fd].dev;
+ dev = file->dev;
if(count == 0) {
return 0;
@@ -588,29 +588,33 @@ int tpmfront_posix_read(int fd, uint8_t* buf, size_t
count)
}
/* handle EOF case */
- if(files[dev->fd].offset >= dev->resplen) {
+ if ( file->offset >= dev->resplen )
+ {
return 0;
}
/* Compute the number of bytes and do the copy operation */
- if((rc = min(count, dev->resplen - files[dev->fd].offset)) != 0) {
- memcpy(buf, dev->respbuf + files[dev->fd].offset, rc);
- files[dev->fd].offset += rc;
+ if ( (rc = min(count, dev->resplen - file->offset)) != 0 )
+ {
+ memcpy(buf, dev->respbuf + file->offset, rc);
+ file->offset += rc;
}
return rc;
}
-int tpmfront_posix_fstat(int fd, struct stat* buf)
+static int tpmfront_posix_fstat(int fd, struct stat *buf)
{
uint8_t* dummybuf;
size_t dummysz;
int rc;
- struct tpmfront_dev* dev = files[fd].dev;
+ struct file *file = get_file_from_fd(fd);
+ struct tpmfront_dev* dev = file->dev;
/* If we have a response waiting, then read it now from the backend
* so we can get its length*/
- if(dev->waiting || (files[dev->fd].read && !dev->respgot)) {
+ if ( dev->waiting || (file->read && !dev->respgot) )
+ {
if ((rc = tpmfront_recv(dev, &dummybuf, &dummysz)) != 0) {
errno = EIO;
return -1;
@@ -626,5 +630,43 @@ int tpmfront_posix_fstat(int fd, struct stat* buf)
return 0;
}
+static int tpmfront_close_fd(int fd)
+{
+ struct file *file = get_file_from_fd(fd);
+
+ shutdown_tpmfront(file->dev);
+
+ return 0;
+}
+
+static struct file_ops tpmfront_ops = {
+ .name = "tpmfront",
+ .read = tpmfront_posix_read,
+ .write = tpmfront_posix_write,
+ .lseek = lseek_default,
+ .close = tpmfront_close_fd,
+ .fstat = tpmfront_posix_fstat,
+};
+
+int tpmfront_open(struct tpmfront_dev* dev)
+{
+ struct file *file;
+ static unsigned int ftype_tpmfront;
+
+ /* Silently prevent multiple opens */
+ if(dev->fd != -1) {
+ return dev->fd;
+ }
+
+ if ( !ftype_tpmfront )
+ ftype_tpmfront = alloc_file_type(&tpmfront_ops);
+
+ dev->fd = alloc_fd(ftype_tpmfront);
+ printk("tpmfront_open(%s) -> %d\n", dev->nodename, dev->fd);
+ file = get_file_from_fd(dev->fd);
+ file->dev = dev;
+ dev->respgot = false;
+ return dev->fd;
+}
#endif
--
2.26.2
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