diff options
| -rw-r--r-- | i386/i386at/kd.c | 19 | ||||
| -rw-r--r-- | i386/i386at/kd.h | 2 |
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 */ |