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path: root/drivers/tty/vt/vc_screen.c
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Diffstat (limited to 'drivers/tty/vt/vc_screen.c')
-rw-r--r--drivers/tty/vt/vc_screen.c90
1 files changed, 76 insertions, 14 deletions
diff --git a/drivers/tty/vt/vc_screen.c b/drivers/tty/vt/vc_screen.c
index e4a66e1fd05f..2384ea85ffaf 100644
--- a/drivers/tty/vt/vc_screen.c
+++ b/drivers/tty/vt/vc_screen.c
@@ -10,6 +10,12 @@
* Attribute/character pair is in native endianity.
* [minor: N+128]
*
+ * /dev/vcsuN: similar to /dev/vcsaN but using 4-byte unicode values
+ * instead of 1-byte screen glyph values.
+ * [minor: N+64]
+ *
+ * /dev/vcsuaN: same idea as /dev/vcsaN for unicode (not yet implemented).
+ *
* This replaces screendump and part of selection, so that the system
* administrator can control access using file system permissions.
*
@@ -51,6 +57,26 @@
#define CON_BUF_SIZE (CONFIG_BASE_SMALL ? 256 : PAGE_SIZE)
+/*
+ * Our minor space:
+ *
+ * 0 ... 63 glyph mode without attributes
+ * 64 ... 127 unicode mode without attributes
+ * 128 ... 191 glyph mode with attributes
+ * 192 ... 255 unused (reserved for unicode with attributes)
+ *
+ * This relies on MAX_NR_CONSOLES being <= 63, meaning 63 actual consoles
+ * with minors 0, 64, 128 and 192 being proxies for the foreground console.
+ */
+#if MAX_NR_CONSOLES > 63
+#warning "/dev/vcs* devices may not accommodate more than 63 consoles"
+#endif
+
+#define console(inode) (iminor(inode) & 63)
+#define use_unicode(inode) (iminor(inode) & 64)
+#define use_attributes(inode) (iminor(inode) & 128)
+
+
struct vcs_poll_data {
struct notifier_block notifier;
unsigned int cons_num;
@@ -102,7 +128,7 @@ vcs_poll_data_get(struct file *file)
poll = kzalloc(sizeof(*poll), GFP_KERNEL);
if (!poll)
return NULL;
- poll->cons_num = iminor(file_inode(file)) & 127;
+ poll->cons_num = console(file_inode(file));
init_waitqueue_head(&poll->waitq);
poll->notifier.notifier_call = vcs_notifier;
if (register_vt_notifier(&poll->notifier) != 0) {
@@ -140,7 +166,7 @@ vcs_poll_data_get(struct file *file)
static struct vc_data*
vcs_vc(struct inode *inode, int *viewed)
{
- unsigned int currcons = iminor(inode) & 127;
+ unsigned int currcons = console(inode);
WARN_CONSOLE_UNLOCKED();
@@ -164,7 +190,6 @@ static int
vcs_size(struct inode *inode)
{
int size;
- int minor = iminor(inode);
struct vc_data *vc;
WARN_CONSOLE_UNLOCKED();
@@ -175,8 +200,12 @@ vcs_size(struct inode *inode)
size = vc->vc_rows * vc->vc_cols;
- if (minor & 128)
+ if (use_attributes(inode)) {
+ if (use_unicode(inode))
+ return -EOPNOTSUPP;
size = 2*size + HEADER_SIZE;
+ } else if (use_unicode(inode))
+ size *= 4;
return size;
}
@@ -197,12 +226,10 @@ static ssize_t
vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
struct inode *inode = file_inode(file);
- unsigned int currcons = iminor(inode);
struct vc_data *vc;
struct vcs_poll_data *poll;
- long pos;
- long attr, read;
- int col, maxcol, viewed;
+ long pos, read;
+ int attr, uni_mode, row, col, maxcol, viewed;
unsigned short *org = NULL;
ssize_t ret;
char *con_buf;
@@ -218,7 +245,8 @@ vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
*/
console_lock();
- attr = (currcons & 128);
+ uni_mode = use_unicode(inode);
+ attr = use_attributes(inode);
ret = -ENXIO;
vc = vcs_vc(inode, &viewed);
if (!vc)
@@ -227,6 +255,10 @@ vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
ret = -EINVAL;
if (pos < 0)
goto unlock_out;
+ /* we enforce 32-bit alignment for pos and count in unicode mode */
+ if (uni_mode && (pos | count) & 3)
+ goto unlock_out;
+
poll = file->private_data;
if (count && poll)
poll->seen_last_update = true;
@@ -266,7 +298,28 @@ vcs_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
con_buf_start = con_buf0 = con_buf;
orig_count = this_round;
maxcol = vc->vc_cols;
- if (!attr) {
+ if (uni_mode) {
+ unsigned int nr;
+
+ ret = vc_uniscr_check(vc);
+ if (ret)
+ break;
+ p /= 4;
+ row = p / vc->vc_cols;
+ col = p % maxcol;
+ nr = maxcol - col;
+ do {
+ if (nr > this_round/4)
+ nr = this_round/4;
+ vc_uniscr_copy_line(vc, con_buf0, viewed,
+ row, col, nr);
+ con_buf0 += nr * 4;
+ this_round -= nr * 4;
+ row++;
+ col = 0;
+ nr = maxcol;
+ } while (this_round);
+ } else if (!attr) {
org = screen_pos(vc, p, viewed);
col = p % maxcol;
p += maxcol - col;
@@ -375,7 +428,6 @@ static ssize_t
vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
struct inode *inode = file_inode(file);
- unsigned int currcons = iminor(inode);
struct vc_data *vc;
long pos;
long attr, size, written;
@@ -396,7 +448,7 @@ vcs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
*/
console_lock();
- attr = (currcons & 128);
+ attr = use_attributes(inode);
ret = -ENXIO;
vc = vcs_vc(inode, &viewed);
if (!vc)
@@ -593,9 +645,15 @@ vcs_fasync(int fd, struct file *file, int on)
static int
vcs_open(struct inode *inode, struct file *filp)
{
- unsigned int currcons = iminor(inode) & 127;
+ unsigned int currcons = console(inode);
+ bool attr = use_attributes(inode);
+ bool uni_mode = use_unicode(inode);
int ret = 0;
-
+
+ /* we currently don't support attributes in unicode mode */
+ if (attr && uni_mode)
+ return -EOPNOTSUPP;
+
console_lock();
if(currcons && !vc_cons_allocated(currcons-1))
ret = -ENXIO;
@@ -628,6 +686,8 @@ void vcs_make_sysfs(int index)
{
device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 1), NULL,
"vcs%u", index + 1);
+ device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 65), NULL,
+ "vcsu%u", index + 1);
device_create(vc_class, NULL, MKDEV(VCS_MAJOR, index + 129), NULL,
"vcsa%u", index + 1);
}
@@ -635,6 +695,7 @@ void vcs_make_sysfs(int index)
void vcs_remove_sysfs(int index)
{
device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 1));
+ device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 65));
device_destroy(vc_class, MKDEV(VCS_MAJOR, index + 129));
}
@@ -647,6 +708,7 @@ int __init vcs_init(void)
vc_class = class_create(THIS_MODULE, "vc");
device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 0), NULL, "vcs");
+ device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 64), NULL, "vcsu");
device_create(vc_class, NULL, MKDEV(VCS_MAJOR, 128), NULL, "vcsa");
for (i = 0; i < MIN_NR_CONSOLES; i++)
vcs_make_sysfs(i);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-12 21:51:07 +0000