Date: Sat, 16 Jan 1999 02:30:02 -0800 (PST) From: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp> To: freebsd-bugs@FreeBSD.ORG Subject: Re: kern/9520: VESA Console Lock-ups Message-ID: <199901161030.CAA25291@freefall.freebsd.org>
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The following reply was made to PR kern/9520; it has been noted by GNATS.
From: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
To: aa8vb@pagesz.net
Cc: FreeBSD-gnats-submit@freebsd.org, yokota@zodiac.mech.utsunomiya-u.ac.jp
Subject: Re: kern/9520: VESA Console Lock-ups
Date: Sat, 16 Jan 1999 19:27:39 +0900
In my previous mail to you, I wrote:
>>>Number: 9520
>>>Category: kern
>>>Synopsis: VESA Console Lock-ups
>[...]
>>>Release: FreeBSD 3.0-RELEASE i386
>>>Organization:
>>self
>>>Environment:
>>
>> Stock 3.0-RELEASE. VESA and VM86 options in compiled into kernel.
[...]
>> I like the new VESA support! However, if I'm not careful I can
>> lock my system pretty easily. For example, switch ttyv0 to
>> 132x43, then Alt-F2 over to ttyv1. Instant lock. If I switch
>> all the ttys over to the same mode before a tty switch (via
>> vidcontrol < /dev/ttyv1 132x40, etc.) then tty switches seem
>> to work OK. However if I try to switch ttyv0 back to 80x60 while
>> ttyv0 is active, I hit another lock up.
>
>Is it actually lockup? Does the system beeps when you type anything
>after switching to ttyv0?
>
>I wonder if it is possible to type Alt-F1 to get back to ttyv0...
>
>I have some theory and will send you a patch shortly.
Ok, here is the patch. It is relative to 3.0-RELEASE. However, I have
not tested this patch as I don't have a 3.0-RELEASE box around me at
the moment.
Apply the patch to /sys/i386/isa/vesa.c and rebuild the kernel.
Please report if it works.
Kazu
yokota@FreeBSD.ORG
--- vesa.c-1.8 Sat Jan 16 18:55:46 1999
+++ vesa.c Sat Jan 16 19:15:31 1999
@@ -118,11 +118,14 @@
/* local macros and functions */
#define BIOS_SADDRTOLADDR(p) ((((p) & 0xffff0000) >> 12) + ((p) & 0x0000ffff))
+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_set_dac(int bits);
-static int vesa_bios_save_palette(int start, int colors, u_char *palette);
-static int vesa_bios_load_palette(int start, int colors, u_char *palette);
+static int vesa_bios_save_palette(int start, int colors, u_char *palette,
+ int bits);
+static int vesa_bios_load_palette(int start, int colors, u_char *palette,
+ int bits);
#define STATE_SIZE 0
#define STATE_SAVE 1
#define STATE_LOAD 2
@@ -153,6 +156,18 @@
}
}
+/* INT 10 BIOS calls */
+static int
+int10_set_mode(int mode)
+{
+ struct vm86frame vmf;
+
+ bzero(&vmf, sizeof(vmf));
+ vmf.vmf_eax = 0x0000 | mode;
+ vm86_intcall(0x10, &vmf);
+ return 0;
+}
+
/* VESA BIOS calls */
static int
vesa_bios_get_mode(int mode, struct vesa_mode *vmode)
@@ -196,11 +211,13 @@
vmf.vmf_eax = 0x4f08;
vmf.vmf_ebx = (bits << 8);
err = vm86_intcall(0x10, &vmf);
- return ((err != 0) || (vmf.vmf_eax != 0x4f));
+ if ((err != 0) || (vmf.vmf_eax != 0x4f))
+ return 6; /* XXX */
+ return ((vmf.vmf_ebx >> 8) & 0x00ff);
}
static int
-vesa_bios_save_palette(int start, int colors, u_char *palette)
+vesa_bios_save_palette(int start, int colors, u_char *palette, int bits)
{
struct vm86frame vmf;
u_char *p;
@@ -220,17 +237,18 @@
return 1;
}
+ bits = 8 - bits;
for (i = 0; i < colors; ++i) {
- palette[i*3] = p[i*4 + 1];
- palette[i*3 + 1] = p[i*4 + 2];
- palette[i*3 + 2] = p[i*4 + 3];
+ palette[i*3] = p[i*4 + 2] << bits;
+ palette[i*3 + 1] = p[i*4 + 1] << bits;
+ palette[i*3 + 2] = p[i*4] << bits;
}
free(p, M_DEVBUF);
return 0;
}
static int
-vesa_bios_load_palette(int start, int colors, u_char *palette)
+vesa_bios_load_palette(int start, int colors, u_char *palette, int bits)
{
struct vm86frame vmf;
u_char *p;
@@ -238,11 +256,12 @@
int i;
p = malloc(colors*4, M_DEVBUF, M_WAITOK);
+ bits = 8 - bits;
for (i = 0; i < colors; ++i) {
- p[i*4] = 0;
- p[i*4 + 1] = palette[i*3];
- p[i*4 + 2] = palette[i*3 + 1];
- p[i*4 + 3] = palette[i*3 + 2];
+ p[i*4] = palette[i*3 + 2] >> bits;
+ p[i*4 + 1] = palette[i*3 + 1] >> bits;
+ p[i*4 + 2] = palette[i*3] >> bits;
+ p[i*4 + 3] = 0;
}
bzero(&vmf, sizeof(vmf));
@@ -664,21 +683,35 @@
static int
vesa_save_palette(int ad, u_char *palette)
{
- if ((ad != vesa_adp->va_index) || !(vesa_adp_info->v_flags & V_DAC8)
- || vesa_bios_set_dac(8))
- return (*prevvidsw.save_palette)(ad, palette);
+ int bits;
+ int error;
- return vesa_bios_save_palette(0, 256, palette);
+ if ((ad == vesa_adp->va_index) && (vesa_adp_info->v_flags & V_DAC8)
+ && ((bits = vesa_bios_set_dac(8)) > 6)) {
+ error = vesa_bios_save_palette(0, 256, palette, bits);
+ if (error == 0)
+ return 0
+ vesa_bios_set_dac(6);
+ }
+
+ return (*prevvidsw->save_palette)(ad, palette);
}
static int
-vesa_load_palette(int ad, u_char *palette)
+vesa_load_palette(video_adapter_t *adp, u_char *palette)
{
- if ((ad != vesa_adp->va_index) || !(vesa_adp_info->v_flags & V_DAC8)
- || vesa_bios_set_dac(8))
- return (*prevvidsw.load_palette)(ad, palette);
+ int bits;
+ int error;
+
+ if ((ad == vesa_adp->va_index) && (vesa_adp_info->v_flags & V_DAC8)
+ && ((bits = vesa_bios_set_dac(8)) > 6)) {
+ error = vesa_bios_load_palette(0, 256, palette, bits);
+ if (error == 0)
+ return 0
+ vesa_bios_set_dac(6);
+ }
- return vesa_bios_load_palette(0, 256, palette);
+ return (*prevvidsw->load_palette)(ad, palette);
}
static int
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