linux/drivers/char/vc_screen.c
Tim Schmielau cd354f1ae7 [PATCH] remove many unneeded #includes of sched.h
After Al Viro (finally) succeeded in removing the sched.h #include in module.h
recently, it makes sense again to remove other superfluous sched.h includes.
There are quite a lot of files which include it but don't actually need
anything defined in there.  Presumably these includes were once needed for
macros that used to live in sched.h, but moved to other header files in the
course of cleaning it up.

To ease the pain, this time I did not fiddle with any header files and only
removed #includes from .c-files, which tend to cause less trouble.

Compile tested against 2.6.20-rc2 and 2.6.20-rc2-mm2 (with offsets) on alpha,
arm, i386, ia64, mips, powerpc, and x86_64 with allnoconfig, defconfig,
allmodconfig, and allyesconfig as well as a few randconfigs on x86_64 and all
configs in arch/arm/configs on arm.  I also checked that no new warnings were
introduced by the patch (actually, some warnings are removed that were emitted
by unnecessarily included header files).

Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-14 08:09:54 -08:00

500 lines
11 KiB
C

/*
* linux/drivers/char/vc_screen.c
*
* Provide access to virtual console memory.
* /dev/vcs0: the screen as it is being viewed right now (possibly scrolled)
* /dev/vcsN: the screen of /dev/ttyN (1 <= N <= 63)
* [minor: N]
*
* /dev/vcsaN: idem, but including attributes, and prefixed with
* the 4 bytes lines,columns,x,y (as screendump used to give).
* Attribute/character pair is in native endianity.
* [minor: N+128]
*
* This replaces screendump and part of selection, so that the system
* administrator can control access using file system permissions.
*
* aeb@cwi.nl - efter Friedas begravelse - 950211
*
* machek@k332.feld.cvut.cz - modified not to send characters to wrong console
* - fixed some fatal off-by-one bugs (0-- no longer == -1 -> looping and looping and looping...)
* - making it shorter - scr_readw are macros which expand in PRETTY long code
*/
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/interrupt.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/vt_kern.h>
#include <linux/selection.h>
#include <linux/kbd_kern.h>
#include <linux/console.h>
#include <linux/smp_lock.h>
#include <linux/device.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#undef attr
#undef org
#undef addr
#define HEADER_SIZE 4
static int
vcs_size(struct inode *inode)
{
int size;
int minor = iminor(inode);
int currcons = minor & 127;
struct vc_data *vc;
if (currcons == 0)
currcons = fg_console;
else
currcons--;
if (!vc_cons_allocated(currcons))
return -ENXIO;
vc = vc_cons[currcons].d;
size = vc->vc_rows * vc->vc_cols;
if (minor & 128)
size = 2*size + HEADER_SIZE;
return size;
}
static loff_t vcs_lseek(struct file *file, loff_t offset, int orig)
{
int size;
down(&con_buf_sem);
size = vcs_size(file->f_path.dentry->d_inode);
switch (orig) {
default:
up(&con_buf_sem);
return -EINVAL;
case 2:
offset += size;
break;
case 1:
offset += file->f_pos;
case 0:
break;
}
if (offset < 0 || offset > size) {
up(&con_buf_sem);
return -EINVAL;
}
file->f_pos = offset;
up(&con_buf_sem);
return file->f_pos;
}
static ssize_t
vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
struct inode *inode = file->f_path.dentry->d_inode;
unsigned int currcons = iminor(inode);
struct vc_data *vc;
long pos;
long viewed, attr, read;
int col, maxcol;
unsigned short *org = NULL;
ssize_t ret;
down(&con_buf_sem);
pos = *ppos;
/* Select the proper current console and verify
* sanity of the situation under the console lock.
*/
acquire_console_sem();
attr = (currcons & 128);
currcons = (currcons & 127);
if (currcons == 0) {
currcons = fg_console;
viewed = 1;
} else {
currcons--;
viewed = 0;
}
ret = -ENXIO;
if (!vc_cons_allocated(currcons))
goto unlock_out;
vc = vc_cons[currcons].d;
ret = -EINVAL;
if (pos < 0)
goto unlock_out;
read = 0;
ret = 0;
while (count) {
char *con_buf0, *con_buf_start;
long this_round, size;
ssize_t orig_count;
long p = pos;
/* Check whether we are above size each round,
* as copy_to_user at the end of this loop
* could sleep.
*/
size = vcs_size(inode);
if (pos >= size)
break;
if (count > size - pos)
count = size - pos;
this_round = count;
if (this_round > CON_BUF_SIZE)
this_round = CON_BUF_SIZE;
/* Perform the whole read into the local con_buf.
* Then we can drop the console spinlock and safely
* attempt to move it to userspace.
*/
con_buf_start = con_buf0 = con_buf;
orig_count = this_round;
maxcol = vc->vc_cols;
if (!attr) {
org = screen_pos(vc, p, viewed);
col = p % maxcol;
p += maxcol - col;
while (this_round-- > 0) {
*con_buf0++ = (vcs_scr_readw(vc, org++) & 0xff);
if (++col == maxcol) {
org = screen_pos(vc, p, viewed);
col = 0;
p += maxcol;
}
}
} else {
if (p < HEADER_SIZE) {
size_t tmp_count;
con_buf0[0] = (char)vc->vc_rows;
con_buf0[1] = (char)vc->vc_cols;
getconsxy(vc, con_buf0 + 2);
con_buf_start += p;
this_round += p;
if (this_round > CON_BUF_SIZE) {
this_round = CON_BUF_SIZE;
orig_count = this_round - p;
}
tmp_count = HEADER_SIZE;
if (tmp_count > this_round)
tmp_count = this_round;
/* Advance state pointers and move on. */
this_round -= tmp_count;
p = HEADER_SIZE;
con_buf0 = con_buf + HEADER_SIZE;
/* If this_round >= 0, then p is even... */
} else if (p & 1) {
/* Skip first byte for output if start address is odd
* Update region sizes up/down depending on free
* space in buffer.
*/
con_buf_start++;
if (this_round < CON_BUF_SIZE)
this_round++;
else
orig_count--;
}
if (this_round > 0) {
unsigned short *tmp_buf = (unsigned short *)con_buf0;
p -= HEADER_SIZE;
p /= 2;
col = p % maxcol;
org = screen_pos(vc, p, viewed);
p += maxcol - col;
/* Buffer has even length, so we can always copy
* character + attribute. We do not copy last byte
* to userspace if this_round is odd.
*/
this_round = (this_round + 1) >> 1;
while (this_round) {
*tmp_buf++ = vcs_scr_readw(vc, org++);
this_round --;
if (++col == maxcol) {
org = screen_pos(vc, p, viewed);
col = 0;
p += maxcol;
}
}
}
}
/* Finally, release the console semaphore while we push
* all the data to userspace from our temporary buffer.
*
* AKPM: Even though it's a semaphore, we should drop it because
* the pagefault handling code may want to call printk().
*/
release_console_sem();
ret = copy_to_user(buf, con_buf_start, orig_count);
acquire_console_sem();
if (ret) {
read += (orig_count - ret);
ret = -EFAULT;
break;
}
buf += orig_count;
pos += orig_count;
read += orig_count;
count -= orig_count;
}
*ppos += read;
if (read)
ret = read;
unlock_out:
release_console_sem();
up(&con_buf_sem);
return ret;
}
static ssize_t
vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
struct inode *inode = file->f_path.dentry->d_inode;
unsigned int currcons = iminor(inode);
struct vc_data *vc;
long pos;
long viewed, attr, size, written;
char *con_buf0;
int col, maxcol;
u16 *org0 = NULL, *org = NULL;
size_t ret;
down(&con_buf_sem);
pos = *ppos;
/* Select the proper current console and verify
* sanity of the situation under the console lock.
*/
acquire_console_sem();
attr = (currcons & 128);
currcons = (currcons & 127);
if (currcons == 0) {
currcons = fg_console;
viewed = 1;
} else {
currcons--;
viewed = 0;
}
ret = -ENXIO;
if (!vc_cons_allocated(currcons))
goto unlock_out;
vc = vc_cons[currcons].d;
size = vcs_size(inode);
ret = -EINVAL;
if (pos < 0 || pos > size)
goto unlock_out;
if (count > size - pos)
count = size - pos;
written = 0;
while (count) {
long this_round = count;
size_t orig_count;
long p;
if (this_round > CON_BUF_SIZE)
this_round = CON_BUF_SIZE;
/* Temporarily drop the console lock so that we can read
* in the write data from userspace safely.
*/
release_console_sem();
ret = copy_from_user(con_buf, buf, this_round);
acquire_console_sem();
if (ret) {
this_round -= ret;
if (!this_round) {
/* Abort loop if no data were copied. Otherwise
* fail with -EFAULT.
*/
if (written)
break;
ret = -EFAULT;
goto unlock_out;
}
}
/* The vcs_size might have changed while we slept to grab
* the user buffer, so recheck.
* Return data written up to now on failure.
*/
size = vcs_size(inode);
if (pos >= size)
break;
if (this_round > size - pos)
this_round = size - pos;
/* OK, now actually push the write to the console
* under the lock using the local kernel buffer.
*/
con_buf0 = con_buf;
orig_count = this_round;
maxcol = vc->vc_cols;
p = pos;
if (!attr) {
org0 = org = screen_pos(vc, p, viewed);
col = p % maxcol;
p += maxcol - col;
while (this_round > 0) {
unsigned char c = *con_buf0++;
this_round--;
vcs_scr_writew(vc,
(vcs_scr_readw(vc, org) & 0xff00) | c, org);
org++;
if (++col == maxcol) {
org = screen_pos(vc, p, viewed);
col = 0;
p += maxcol;
}
}
} else {
if (p < HEADER_SIZE) {
char header[HEADER_SIZE];
getconsxy(vc, header + 2);
while (p < HEADER_SIZE && this_round > 0) {
this_round--;
header[p++] = *con_buf0++;
}
if (!viewed)
putconsxy(vc, header + 2);
}
p -= HEADER_SIZE;
col = (p/2) % maxcol;
if (this_round > 0) {
org0 = org = screen_pos(vc, p/2, viewed);
if ((p & 1) && this_round > 0) {
char c;
this_round--;
c = *con_buf0++;
#ifdef __BIG_ENDIAN
vcs_scr_writew(vc, c |
(vcs_scr_readw(vc, org) & 0xff00), org);
#else
vcs_scr_writew(vc, (c << 8) |
(vcs_scr_readw(vc, org) & 0xff), org);
#endif
org++;
p++;
if (++col == maxcol) {
org = screen_pos(vc, p/2, viewed);
col = 0;
}
}
p /= 2;
p += maxcol - col;
}
while (this_round > 1) {
unsigned short w;
w = get_unaligned(((unsigned short *)con_buf0));
vcs_scr_writew(vc, w, org++);
con_buf0 += 2;
this_round -= 2;
if (++col == maxcol) {
org = screen_pos(vc, p, viewed);
col = 0;
p += maxcol;
}
}
if (this_round > 0) {
unsigned char c;
c = *con_buf0++;
#ifdef __BIG_ENDIAN
vcs_scr_writew(vc, (vcs_scr_readw(vc, org) & 0xff) | (c << 8), org);
#else
vcs_scr_writew(vc, (vcs_scr_readw(vc, org) & 0xff00) | c, org);
#endif
}
}
count -= orig_count;
written += orig_count;
buf += orig_count;
pos += orig_count;
if (org0)
update_region(vc, (unsigned long)(org0), org - org0);
}
*ppos += written;
ret = written;
unlock_out:
release_console_sem();
up(&con_buf_sem);
return ret;
}
static int
vcs_open(struct inode *inode, struct file *filp)
{
unsigned int currcons = iminor(inode) & 127;
if(currcons && !vc_cons_allocated(currcons-1))
return -ENXIO;
return 0;
}
static const struct file_operations vcs_fops = {
.llseek = vcs_lseek,
.read = vcs_read,
.write = vcs_write,
.open = vcs_open,
};
static struct class *vc_class;
void vcs_make_sysfs(struct tty_struct *tty)
{
device_create(vc_class, NULL, MKDEV(VCS_MAJOR, tty->index + 1),
"vcs%u", tty->index + 1);
device_create(vc_class, NULL, MKDEV(VCS_MAJOR, tty->index + 129),
"vcsa%u", tty->index + 1);
}
void vcs_remove_sysfs(struct tty_struct *tty)
{
device_destroy(vc_class, MKDEV(VCS_MAJOR, tty->index + 1));
device_destroy(vc_class, MKDEV(VCS_MAJOR, tty->index + 129));
}
int __init vcs_init(void)
{
if (register_chrdev(VCS_MAJOR, "vcs", &vcs_fops))
panic("unable to get major %d for vcs device", VCS_MAJOR);
vc_class = class_create(THIS_MODULE, "vc");
device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 0), "vcs");
device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 128), "vcsa");
return 0;
}