Fix initialization of video_mode_ptr. It only worked if the segments
in the far pointers are multiples of 4K (as is normal when the video BIOS is at seg 0xc000). Disallow mode switching if the pointer is bad. Use a new pa_to_va() macro for all BIOS and video addresses in syscons.
This commit is contained in:
Bruce Evans
parent
d1a27c8dab
commit
0d55b76505
@ -35,7 +35,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: syscons.c,v 1.71 1994/10/23 21:27:36 wollman Exp $
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* $Id: syscons.c,v 1.72 1994/10/24 21:36:38 wollman Exp $
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*/
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#include "sc.h"
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@ -57,6 +57,7 @@
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#include <sys/malloc.h>
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#include <sys/devconf.h>
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#include <machine/clock.h>
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#include <machine/console.h>
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#include <machine/psl.h>
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#include <machine/frame.h>
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@ -76,6 +77,12 @@
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#include <i386/isa/iso8859.font>
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#endif
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/* vm things */
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#define ISMAPPED(pa, width) \
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(((pa) <= (u_long)0x1000 - (width)) \
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|| ((pa) >= 0xa0000 && (pa) <= 0x100000 - (width)))
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#define pa_to_va(pa) (KERNBASE + (pa)) /* works if ISMAPPED(pa...) */
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/* status flags */
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#define LOCK_KEY_MASK 0x0000F
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#define LED_MASK 0x00007
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@ -200,6 +207,7 @@ static int scrn_blanked = 0; /* screen saver active flag */
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static int scrn_saver = 0; /* screen saver routine */
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static long scrn_time_stamp;
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static u_char scr_map[256];
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static char *video_mode_ptr = NULL;
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/* function prototypes */
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int pcprobe(struct isa_device *dev);
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@ -281,11 +289,10 @@ struct tty *pccons[NCONS+1];
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struct tty pccons[NCONS+1];
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#endif
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#define timeout_t timeout_func_t
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#define MONO_BUF (KERNBASE+0xB0000)
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#define CGA_BUF (KERNBASE+0xB8000)
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#define MONO_BUF pa_to_va(0xB0000)
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#define CGA_BUF pa_to_va(0xB8000)
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u_short *Crtat = (u_short *)MONO_BUF;
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void consinit(void) {scinit();}
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extern char *video_mode_ptr;
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struct isa_driver scdriver = {
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pcprobe, pcattach, "sc", 1
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@ -666,7 +673,7 @@ pcioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
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case SW_ENH_B80x25: case SW_ENH_C80x25:
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case SW_ENH_B80x43: case SW_ENH_C80x43:
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if (!crtc_vga)
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if (!crtc_vga || video_mode_ptr == NULL)
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return ENXIO;
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cmd &= 0xFF;
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i = cmd < M_VGA_C80x50 ?
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@ -2107,7 +2114,23 @@ scinit(void)
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/* is this a VGA or higher ? */
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outb(crtc_addr, 7);
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if (inb(crtc_addr) == 7) {
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u_long pa;
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u_long segoff;
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crtc_vga = 1;
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/*
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* Get the BIOS video mode pointer.
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*/
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segoff = *(u_long *)pa_to_va(0x4a8);
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pa = (((segoff & 0xffff0000) >> 12) + (segoff & 0xffff));
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if (ISMAPPED(pa, sizeof(u_long))) {
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segoff = *(u_long *)pa_to_va(pa);
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pa = (((segoff & 0xffff0000) >> 12)
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+ (segoff & 0xffff));
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if (ISMAPPED(pa, 64))
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video_mode_ptr = (char *)pa_to_va(pa);
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}
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#if defined(FAT_CURSOR)
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start = 0;
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end = 18;
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@ -2639,7 +2662,7 @@ set_mode(scr_stat *scp)
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return;
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/* mode change only on VGA's */
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if (!crtc_vga) {
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if (!crtc_vga || video_mode_ptr == NULL) {
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/* (re)activate cursor */
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untimeout((timeout_t)cursor_pos, 0);
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cursor_pos(1);
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@ -2685,7 +2708,7 @@ set_mode(scr_stat *scp)
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case M_ENH_B40x25: case M_ENH_C40x25:
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case M_ENH_B80x25: case M_ENH_C80x25:
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modetable = (char*)(video_mode_ptr + (scp->mode * 64));
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modetable = video_mode_ptr + (scp->mode * 64);
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setup_mode:
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set_vgaregs(modetable);
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font_size = *(modetable + 2);
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@ -2799,11 +2822,11 @@ copy_font(int direction, int segment, int size, char* font)
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for (ch=0; ch < 256; ch++)
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for (line=0; line < size; line++)
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if (direction)
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*((char *)atdevbase+(segment*0x4000)+(ch*32)+line) =
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*(char *)pa_to_va(VIDEOMEM+(segment*0x4000)+(ch*32)+line) =
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font[(ch*size)+line];
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else
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font[(ch*size)+line] =
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*((char *)atdevbase+(segment*0x4000)+(ch*32)+line);
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*(char *)pa_to_va(VIDEOMEM+(segment*0x4000)+(ch*32)+line);
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/* setup vga for text mode again */
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s = splhigh();
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inb(crtc_addr+6); /* reset flip/flop */
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@ -35,7 +35,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: syscons.c,v 1.71 1994/10/23 21:27:36 wollman Exp $
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* $Id: syscons.c,v 1.72 1994/10/24 21:36:38 wollman Exp $
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*/
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#include "sc.h"
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@ -57,6 +57,7 @@
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#include <sys/malloc.h>
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#include <sys/devconf.h>
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#include <machine/clock.h>
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#include <machine/console.h>
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#include <machine/psl.h>
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#include <machine/frame.h>
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@ -76,6 +77,12 @@
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#include <i386/isa/iso8859.font>
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#endif
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/* vm things */
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#define ISMAPPED(pa, width) \
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(((pa) <= (u_long)0x1000 - (width)) \
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|| ((pa) >= 0xa0000 && (pa) <= 0x100000 - (width)))
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#define pa_to_va(pa) (KERNBASE + (pa)) /* works if ISMAPPED(pa...) */
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/* status flags */
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#define LOCK_KEY_MASK 0x0000F
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#define LED_MASK 0x00007
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@ -200,6 +207,7 @@ static int scrn_blanked = 0; /* screen saver active flag */
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static int scrn_saver = 0; /* screen saver routine */
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static long scrn_time_stamp;
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static u_char scr_map[256];
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static char *video_mode_ptr = NULL;
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/* function prototypes */
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int pcprobe(struct isa_device *dev);
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@ -281,11 +289,10 @@ struct tty *pccons[NCONS+1];
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struct tty pccons[NCONS+1];
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#endif
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#define timeout_t timeout_func_t
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#define MONO_BUF (KERNBASE+0xB0000)
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#define CGA_BUF (KERNBASE+0xB8000)
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#define MONO_BUF pa_to_va(0xB0000)
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#define CGA_BUF pa_to_va(0xB8000)
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u_short *Crtat = (u_short *)MONO_BUF;
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void consinit(void) {scinit();}
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extern char *video_mode_ptr;
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struct isa_driver scdriver = {
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pcprobe, pcattach, "sc", 1
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@ -666,7 +673,7 @@ pcioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
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case SW_ENH_B80x25: case SW_ENH_C80x25:
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case SW_ENH_B80x43: case SW_ENH_C80x43:
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if (!crtc_vga)
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if (!crtc_vga || video_mode_ptr == NULL)
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return ENXIO;
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cmd &= 0xFF;
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i = cmd < M_VGA_C80x50 ?
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@ -2107,7 +2114,23 @@ scinit(void)
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/* is this a VGA or higher ? */
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outb(crtc_addr, 7);
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if (inb(crtc_addr) == 7) {
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u_long pa;
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u_long segoff;
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crtc_vga = 1;
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/*
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* Get the BIOS video mode pointer.
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*/
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segoff = *(u_long *)pa_to_va(0x4a8);
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pa = (((segoff & 0xffff0000) >> 12) + (segoff & 0xffff));
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if (ISMAPPED(pa, sizeof(u_long))) {
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segoff = *(u_long *)pa_to_va(pa);
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pa = (((segoff & 0xffff0000) >> 12)
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+ (segoff & 0xffff));
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if (ISMAPPED(pa, 64))
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video_mode_ptr = (char *)pa_to_va(pa);
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}
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#if defined(FAT_CURSOR)
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start = 0;
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end = 18;
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@ -2639,7 +2662,7 @@ set_mode(scr_stat *scp)
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return;
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/* mode change only on VGA's */
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if (!crtc_vga) {
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if (!crtc_vga || video_mode_ptr == NULL) {
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/* (re)activate cursor */
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untimeout((timeout_t)cursor_pos, 0);
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cursor_pos(1);
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@ -2685,7 +2708,7 @@ set_mode(scr_stat *scp)
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case M_ENH_B40x25: case M_ENH_C40x25:
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case M_ENH_B80x25: case M_ENH_C80x25:
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modetable = (char*)(video_mode_ptr + (scp->mode * 64));
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modetable = video_mode_ptr + (scp->mode * 64);
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setup_mode:
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set_vgaregs(modetable);
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font_size = *(modetable + 2);
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@ -2799,11 +2822,11 @@ copy_font(int direction, int segment, int size, char* font)
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for (ch=0; ch < 256; ch++)
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for (line=0; line < size; line++)
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if (direction)
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*((char *)atdevbase+(segment*0x4000)+(ch*32)+line) =
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*(char *)pa_to_va(VIDEOMEM+(segment*0x4000)+(ch*32)+line) =
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font[(ch*size)+line];
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else
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font[(ch*size)+line] =
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*((char *)atdevbase+(segment*0x4000)+(ch*32)+line);
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*(char *)pa_to_va(VIDEOMEM+(segment*0x4000)+(ch*32)+line);
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/* setup vga for text mode again */
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s = splhigh();
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inb(crtc_addr+6); /* reset flip/flop */
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@ -35,7 +35,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: syscons.c,v 1.71 1994/10/23 21:27:36 wollman Exp $
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* $Id: syscons.c,v 1.72 1994/10/24 21:36:38 wollman Exp $
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*/
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#include "sc.h"
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@ -57,6 +57,7 @@
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#include <sys/malloc.h>
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#include <sys/devconf.h>
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#include <machine/clock.h>
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#include <machine/console.h>
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#include <machine/psl.h>
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#include <machine/frame.h>
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@ -76,6 +77,12 @@
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#include <i386/isa/iso8859.font>
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#endif
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/* vm things */
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#define ISMAPPED(pa, width) \
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(((pa) <= (u_long)0x1000 - (width)) \
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|| ((pa) >= 0xa0000 && (pa) <= 0x100000 - (width)))
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#define pa_to_va(pa) (KERNBASE + (pa)) /* works if ISMAPPED(pa...) */
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/* status flags */
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#define LOCK_KEY_MASK 0x0000F
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#define LED_MASK 0x00007
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@ -200,6 +207,7 @@ static int scrn_blanked = 0; /* screen saver active flag */
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static int scrn_saver = 0; /* screen saver routine */
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static long scrn_time_stamp;
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static u_char scr_map[256];
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static char *video_mode_ptr = NULL;
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/* function prototypes */
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int pcprobe(struct isa_device *dev);
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@ -281,11 +289,10 @@ struct tty *pccons[NCONS+1];
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struct tty pccons[NCONS+1];
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#endif
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#define timeout_t timeout_func_t
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#define MONO_BUF (KERNBASE+0xB0000)
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#define CGA_BUF (KERNBASE+0xB8000)
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#define MONO_BUF pa_to_va(0xB0000)
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#define CGA_BUF pa_to_va(0xB8000)
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u_short *Crtat = (u_short *)MONO_BUF;
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void consinit(void) {scinit();}
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extern char *video_mode_ptr;
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struct isa_driver scdriver = {
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pcprobe, pcattach, "sc", 1
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@ -666,7 +673,7 @@ pcioctl(dev_t dev, int cmd, caddr_t data, int flag, struct proc *p)
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case SW_ENH_B80x25: case SW_ENH_C80x25:
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case SW_ENH_B80x43: case SW_ENH_C80x43:
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if (!crtc_vga)
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if (!crtc_vga || video_mode_ptr == NULL)
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return ENXIO;
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cmd &= 0xFF;
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i = cmd < M_VGA_C80x50 ?
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@ -2107,7 +2114,23 @@ scinit(void)
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/* is this a VGA or higher ? */
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outb(crtc_addr, 7);
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if (inb(crtc_addr) == 7) {
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u_long pa;
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u_long segoff;
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crtc_vga = 1;
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/*
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* Get the BIOS video mode pointer.
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*/
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segoff = *(u_long *)pa_to_va(0x4a8);
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pa = (((segoff & 0xffff0000) >> 12) + (segoff & 0xffff));
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if (ISMAPPED(pa, sizeof(u_long))) {
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segoff = *(u_long *)pa_to_va(pa);
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pa = (((segoff & 0xffff0000) >> 12)
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+ (segoff & 0xffff));
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if (ISMAPPED(pa, 64))
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video_mode_ptr = (char *)pa_to_va(pa);
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}
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#if defined(FAT_CURSOR)
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start = 0;
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end = 18;
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@ -2639,7 +2662,7 @@ set_mode(scr_stat *scp)
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return;
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/* mode change only on VGA's */
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if (!crtc_vga) {
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if (!crtc_vga || video_mode_ptr == NULL) {
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/* (re)activate cursor */
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untimeout((timeout_t)cursor_pos, 0);
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cursor_pos(1);
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@ -2685,7 +2708,7 @@ set_mode(scr_stat *scp)
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case M_ENH_B40x25: case M_ENH_C40x25:
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case M_ENH_B80x25: case M_ENH_C80x25:
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modetable = (char*)(video_mode_ptr + (scp->mode * 64));
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modetable = video_mode_ptr + (scp->mode * 64);
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setup_mode:
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set_vgaregs(modetable);
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font_size = *(modetable + 2);
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@ -2799,11 +2822,11 @@ copy_font(int direction, int segment, int size, char* font)
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for (ch=0; ch < 256; ch++)
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for (line=0; line < size; line++)
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if (direction)
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*((char *)atdevbase+(segment*0x4000)+(ch*32)+line) =
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*(char *)pa_to_va(VIDEOMEM+(segment*0x4000)+(ch*32)+line) =
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font[(ch*size)+line];
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else
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font[(ch*size)+line] =
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*((char *)atdevbase+(segment*0x4000)+(ch*32)+line);
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*(char *)pa_to_va(VIDEOMEM+(segment*0x4000)+(ch*32)+line);
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/* setup vga for text mode again */
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s = splhigh();
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inb(crtc_addr+6); /* reset flip/flop */
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Block a user