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Another round of fix for palette loading.

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- Don't try to change DAC width when unnecessary.
- Convert 8 bit DAC data to 6 bit DAC data before unloading the vesa
  KLD module.
This commit is contained in:
Kazutaka YOKOTA 1999-03-29 15:10:56 +00:00
parent 20f20ae658
commit d1a9e1a0cb
1 changed files with 39 additions and 8 deletions
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47
sys/i386/isa/vesa.c
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@ -23,7 +23,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: vesa.c,v 1.19 1999/03/18 04:38:16 jlemon Exp $
* $Id: vesa.c,v 1.20 1999/03/18 20:13:20 jlemon Exp $
*/
#include "vga.h"
@ -152,6 +152,7 @@ static char *vesa_revstr = NULL;
static int int10_set_mode(int mode);
static int vesa_bios_get_mode(int mode, struct vesa_mode *vmode);
static int vesa_bios_set_mode(int mode);
static int vesa_bios_get_dac(void);
static int vesa_bios_set_dac(int bits);
static int vesa_bios_save_palette(int start, int colors, u_char *palette,
int bits);
@ -234,6 +235,21 @@ vesa_bios_set_mode(int mode)
return ((err != 0) || (vmf.vmf_eax != 0x4f));
}
static int
vesa_bios_get_dac(void)
{
struct vm86frame vmf;
int err;
bzero(&vmf, sizeof(vmf));
vmf.vmf_eax = 0x4f08;
vmf.vmf_ebx = 1; /* get DAC width */
err = vm86_intcall(0x10, &vmf);
if ((err != 0) || (vmf.vmf_eax != 0x4f))
return 6; /* XXX */
return ((vmf.vmf_ebx >> 8) & 0x00ff);
}
static int
vesa_bios_set_dac(int bits)
{
@ -841,12 +857,14 @@ vesa_save_palette(video_adapter_t *adp, u_char *palette)
int bits;
int error;
if ((adp == vesa_adp) && (vesa_adp_info->v_flags & V_DAC8)
&& ((bits = vesa_bios_set_dac(8)) > 6)) {
if ((adp == vesa_adp) && (vesa_adp_info->v_flags & V_DAC8)
&& VESA_MODE(adp->va_mode)) {
bits = vesa_bios_get_dac();
error = vesa_bios_save_palette(0, 256, palette, bits);
vesa_bios_set_dac(6);
if (error == 0)
return 0;
if (bits != 6)
return error;
}
return (*prevvidsw->save_palette)(adp, palette);
@ -855,16 +873,19 @@ vesa_save_palette(video_adapter_t *adp, u_char *palette)
static int
vesa_load_palette(video_adapter_t *adp, u_char *palette)
{
#if notyet
int bits;
int error;
if ((adp == vesa_adp) && (vesa_adp_info->v_flags & V_DAC8)
&& ((bits = vesa_bios_set_dac(8)) > 6)) {
&& VESA_MODE(adp->va_mode) && ((bits = vesa_bios_set_dac(8)) > 6)) {
error = vesa_bios_load_palette(0, 256, palette, bits);
vesa_bios_set_dac(6);
if (error == 0)
return 0;
if (vesa_bios_set_dac(6) != 6)
return 1;
}
#endif /* notyet */
return (*prevvidsw->load_palette)(adp, palette);
}
@ -1075,7 +1096,9 @@ vesa_load(void)
static int
vesa_unload(void)
{
u_char palette[256*3];
int error;
int bits;
int s;
/* if the adapter is currently in a VESA mode, don't unload */
@ -1089,8 +1112,16 @@ vesa_unload(void)
s = spltty();
if ((error = vesa_unload_ioctl()) == 0) {
if (vesa_adp != NULL) {
if (vesa_adp_info->v_flags & V_DAC8)
vesa_bios_set_dac(6);
if (vesa_adp_info->v_flags & V_DAC8) {
bits = vesa_bios_get_dac();
if (bits > 6) {
vesa_bios_save_palette(0, 256,
palette, bits);
vesa_bios_set_dac(6);
vesa_bios_load_palette(0, 256,
palette, 6);
}
}
vesa_adp->va_flags &= ~V_ADP_VESA;
vidsw[vesa_adp->va_index] = prevvidsw;
}