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drivers/vbe: Properly return failures from int 0x10/ax=0x4f00

This commit is contained in:
mintsuki 2024-07-20 18:59:26 +02:00
parent 923412b90d
commit d1ad6d6285
1 changed files with 14 additions and 3 deletions
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17
common/drivers/vbe.c
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@ -88,12 +88,19 @@ struct vbe_mode_info_struct {
uint8_t reserved2[189];
} __attribute__((packed));
static void get_vbe_info(struct vbe_info_struct *buf) {
static bool get_vbe_info(struct vbe_info_struct *buf) {
struct rm_regs r = {0};
r.eax = 0x4f00;
r.edi = (uint32_t)buf;
rm_int(0x10, &r, &r);
if ((r.eax & 0xff00) >> 8 != 0
|| (r.eax & 0x00ff) != 0x4f) {
return false;
}
return true;
}
static void get_vbe_mode_info(struct vbe_mode_info_struct *buf,
@ -118,7 +125,9 @@ static int set_vbe_mode(uint16_t mode) {
struct fb_info *vbe_get_mode_list(size_t *count) {
struct vbe_info_struct vbe_info;
get_vbe_info(&vbe_info);
if (!get_vbe_info(&vbe_info)) {
return NULL;
}
uint16_t *vid_modes = (uint16_t *)rm_desegment(vbe_info.vid_modes_seg,
vbe_info.vid_modes_off);
@ -190,7 +199,9 @@ bool init_vbe(struct fb_info *ret,
size_t current_fallback = 0;
struct vbe_info_struct vbe_info;
get_vbe_info(&vbe_info);
if (!get_vbe_info(&vbe_info)) {
return false;
}
printv("vbe: Version: %u.%u\n", vbe_info.version_maj, vbe_info.version_min);
printv("vbe: OEM: %s\n", (char *)rm_desegment(vbe_info.oem_seg, vbe_info.oem_off));