* This must be preceded by a successful call to vc_uniscr_check() once
* the console lock has been taken.
*/
-void vc_uniscr_copy_line(struct vc_data *vc, void *dest,
+void vc_uniscr_copy_line(struct vc_data *vc, void *dest, int viewed,
unsigned int row, unsigned int col, unsigned int nr)
{
struct uni_screen *uniscr = get_vc_uniscr(vc);
+ int offset = row * vc->vc_size_row + col * 2;
+ unsigned long pos;
BUG_ON(!uniscr);
- memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
+
+ pos = (unsigned long)screenpos(vc, offset, viewed);
+ if (pos >= vc->vc_origin && pos < vc->vc_scr_end) {
+ /*
+ * Desired position falls in the main screen buffer.
+ * However the actual row/col might be different if
+ * scrollback is active.
+ */
+ row = (pos - vc->vc_origin) / vc->vc_size_row;
+ col = ((pos - vc->vc_origin) % vc->vc_size_row) / 2;
+ memcpy(dest, &uniscr->lines[row][col], nr * sizeof(char32_t));
+ } else {
+ /*
+ * Scrollback is active. For now let's simply backtranslate
+ * the screen glyphs until the unicode screen buffer does
+ * synchronize with console display drivers for a scrollback
+ * buffer of its own.
+ */
+ u16 *p = (u16 *)pos;
+ int mask = vc->vc_hi_font_mask | 0xff;
+ char32_t *uni_buf = dest;
+ while (nr--) {
+ u16 glyph = scr_readw(p++) & mask;
+ *uni_buf++ = inverse_translate(vc, glyph, true);
+ }
+ }
}
extern void vcs_scr_updated(struct vc_data *vc);
extern int vc_uniscr_check(struct vc_data *vc);
-extern void vc_uniscr_copy_line(struct vc_data *vc, void *dest,
+extern void vc_uniscr_copy_line(struct vc_data *vc, void *dest, int viewed,
unsigned int row, unsigned int col,
unsigned int nr);