diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/vt/consolemap.c | 51 |
1 files changed, 43 insertions, 8 deletions
diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c index a0f3d6c4d39d..8308fc7cdc26 100644 --- a/drivers/tty/vt/consolemap.c +++ b/drivers/tty/vt/consolemap.c @@ -516,6 +516,7 @@ int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list) int err = 0, err1, i; struct uni_pagedir *p, *q; + /* Save original vc_unipagdir_loc in case we allocate a new one */ p = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc; if (p->readonly) return -EIO; @@ -528,26 +529,57 @@ int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list) err1 = con_clear_unimap(vc, NULL); if (err1) return err1; + /* + * Since refcount was > 1, con_clear_unimap() allocated a + * a new uni_pagedir for this vc. Re: p != q + */ q = (struct uni_pagedir *)*vc->vc_uni_pagedir_loc; - for (i = 0, l = 0; i < 32; i++) + + /* + * uni_pgdir is a 32*32*64 table with rows allocated + * when its first entry is added. The unicode value must + * still be incremented for empty rows. We are copying + * entries from "p" (old) to "q" (new). + */ + l = 0; /* unicode value */ + for (i = 0; i < 32; i++) if ((p1 = p->uni_pgdir[i])) for (j = 0; j < 32; j++) - if ((p2 = p1[j])) + if ((p2 = p1[j])) { for (k = 0; k < 64; k++, l++) if (p2[k] != 0xffff) { + /* + * Found one, copy entry for unicode + * l with fontpos value p2[k]. + */ err1 = con_insert_unipair(q, l, p2[k]); if (err1) { p->refcount++; *vc->vc_uni_pagedir_loc = (unsigned long)p; con_release_unimap(q); kfree(q); - return err1; + return err1; } - } - p = q; - } else if (p == dflt) + } + } else { + /* Account for row of 64 empty entries */ + l += 64; + } + else + /* Account for empty table */ + l += 32 * 64; + + /* + * Finished copying font table, set vc_uni_pagedir to new table + */ + p = q; + } else if (p == dflt) { dflt = NULL; - + } + + /* + * Insert user specified unicode pairs into new table. + */ while (ct--) { unsigned short unicode, fontpos; __get_user(unicode, &list->unicode); @@ -557,11 +589,14 @@ int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list) list++; } + /* + * Merge with fontmaps of any other virtual consoles. + */ if (con_unify_unimap(vc, p)) return err; for (i = 0; i <= 3; i++) - set_inverse_transl(vc, p, i); /* Update all inverse translations */ + set_inverse_transl(vc, p, i); /* Update inverse translations */ set_inverse_trans_unicode(vc, p); return err; |