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First cut on VESA BIOS access to get extended video modes and framebuffer

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access. For now, there is just probing code.
This commit is contained in:
drochner 2002-07-07 12:59:58 +00:00
parent 3b22d7973b
commit c359f53282
2 changed files with 92 additions and 0 deletions
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85
sys/arch/i386/bios/vesabios.c Normal file
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/* $NetBSD: vesabios.c,v 1.1 2002/07/07 12:59:58 drochner Exp $ */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <machine/frame.h>
#include <machine/kvm86.h>
#include <arch/i386/bios/vesabios.h>
struct vbeinfoblock
{
char VbeSignature[4];
u_int16_t VbeVersion;
u_int32_t OemStringPtr;
u_int32_t Capabilities;
u_int32_t VideoModePtr;
u_int16_t TotalMemory;
u_int16_t OemSoftwareRev;
u_int32_t OemVendorNamePtr, OemProductNamePtr, OemProductRevPtr;
/* data area, in total max 512 bytes for VBE 2.0 */
} __attribute__ ((packed));
static int vesabios_match(struct device *, struct cfdata *, void *);
struct cfattach vesabios_ca = {
sizeof(struct device), vesabios_match, 0
};
static int
vesabios_match(parent, match, aux)
struct device *parent;
struct cfdata *match;
void *aux;
{
struct vesabios_attach_args *vaa = aux;
/* These are not the droids you're looking for. */
if (strcmp(vaa->vaa_busname, "vesabios") != 0)
return (0);
return (0); /* XXX for now */
}
int
vbeprobe()
{
unsigned char *buf;
struct trapframe tf;
int res, ok = 0;
struct vbeinfoblock *vi;
buf = kvm86_bios_addpage(0x2000);
if (!buf) {
printf("vbeprobe: kvm86_bios_addpage(0x2000) failed\n");
return (0);
}
memcpy(buf, "VBE2", 4);
memset(&tf, 0, sizeof(struct trapframe));
tf.tf_eax = 0x4f00; /* function code */
tf.tf_es = 0;
tf.tf_edi = 0x2000; /* buf ptr */
res = kvm86_bioscall(0x10, &tf);
printf("vbecall: res=%d, ax=%x\n", res, tf.tf_eax);
if (res || tf.tf_eax != 0x004f)
goto out;
vi = (struct vbeinfoblock *)buf;
if (memcmp(vi->VbeSignature, "VESA", 4)) {
printf("VESA: bad sig\n");
goto out;
}
printf("VESA: version: %x, cap: %x, oem @%x, modes @%x\n",
vi->VbeVersion, vi->Capabilities, vi->OemStringPtr,
vi->VideoModePtr);
ok = 1;
out:
kvm86_bios_delpage(0x2000, buf);
return (ok);
}

7
sys/arch/i386/bios/vesabios.h Normal file
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/* $NetBSD: vesabios.h,v 1.1 2002/07/07 12:59:58 drochner Exp $ */
int vbeprobe __P((void));
struct vesabios_attach_args {
char *vaa_busname;
};