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-rw-r--r--i386/i386at/kd.c19
-rw-r--r--i386/i386at/kd.h2
2 files changed, 21 insertions, 0 deletions
diff --git a/i386/i386at/kd.c b/i386/i386at/kd.c
index 3c66cc5..f70175c 100644
--- a/i386/i386at/kd.c
+++ b/i386/i386at/kd.c
@@ -2498,6 +2498,7 @@ kd_xga_init(void)
{
csrpos_t xga_getpos();
unsigned char screen;
+ unsigned char start, stop;
outb(CMOS_ADDR, CMOS_EB);
screen = inb(CMOS_DATA) & CM_SCRMSK;
@@ -2552,6 +2553,24 @@ kd_xga_init(void)
printf("kd: unknown screen type, defaulting to EGA\n");
}
+ outb(kd_index_reg, C_START);
+ start = inb(kd_io_reg);
+ /* Make sure cursor is enabled */
+ start &= ~0x20;
+ outb(kd_io_reg, start);
+ outb(kd_index_reg, C_STOP);
+ stop = inb(kd_io_reg);
+
+ if (!start && !stop)
+ {
+ /* Some firmware seem not to be initializing the cursor size
+ * any more... Try using standard values. */
+ outb(kd_index_reg, C_START);
+ outb(kd_io_reg, 14);
+ outb(kd_index_reg, C_STOP);
+ outb(kd_io_reg, 15);
+ }
+
kd_setpos(xga_getpos());
}
diff --git a/i386/i386at/kd.h b/i386/i386at/kd.h
index 0907e23..6c869d6 100644
--- a/i386/i386at/kd.h
+++ b/i386/i386at/kd.h
@@ -113,6 +113,8 @@ WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
/*
* Commands sent to graphics adapter.
*/
+#define C_START 0x0a /* return cursor line start */
+#define C_STOP 0x0b /* return cursor line stop */
#define C_LOW 0x0f /* return low byte of cursor addr */
#define C_HIGH 0x0e /* high byte */