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loader: create local copy of mode list provided by vbeinfoblock

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Apparently some systems do corrupt mode list memory area, so we need
to use local copy instead.
This commit is contained in:
Toomas Soome 2021-01-16 12:18:32 +02:00
parent 0bc776f3da
commit ad1ebbe5ce
1 changed files with 49 additions and 33 deletions
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82
stand/i386/libi386/vbe.c
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@ -48,12 +48,14 @@
static struct vbeinfoblock *vbe;
static struct modeinfoblock *vbe_mode;
static uint16_t *vbe_mode_list;
static size_t vbe_mode_list_size;
/* The default VGA color palette format is 6 bits per primary color. */
int palette_format = 6;
#define VESA_MODE_BASE 0x100
#define VESA_MODE_MAX 0x1ff
#define VESA_MODE_COUNT (VESA_MODE_MAX - VESA_MODE_BASE + 1)
/*
* palette array for 8-bit indexed colors. In this case, cmap does store
@ -545,9 +547,17 @@ mode_set(struct env_var *ev, int flags __unused, const void *value)
return (0);
}
static void *
vbe_farptr(uint32_t farptr)
{
return (PTOV((((farptr & 0xffff0000) >> 12) + (farptr & 0xffff))));
}
void
vbe_init(void)
{
uint16_t *p, *ml;
/* First set FB for text mode. */
gfx_state.tg_fb_type = FB_TEXT;
gfx_state.tg_fb.fb_height = TEXT_ROWS;
@ -573,6 +583,27 @@ vbe_init(void)
vbe_mode = NULL;
}
/*
* Copy mode list. We must do this because some systems do
* corrupt the provided list (vbox 6.1 is one example).
*/
p = ml = vbe_farptr(vbe->VideoModePtr);
while(*p++ != 0xFFFF)
;
vbe_mode_list_size = (uintptr_t)p - (uintptr_t)ml;
vbe_mode_list = malloc(vbe_mode_list_size);
if (vbe_mode_list == NULL) {
free(vbe);
vbe = NULL;
free(vbe_mode);
vbe_mode = NULL;
}
bcopy(ml, vbe_mode_list, vbe_mode_list_size);
/* reset VideoModePtr, so we will not have chance to use bad data. */
vbe->VideoModePtr = 0;
env_setenv("screen.textmode", EV_VOLATILE, "1", mode_set,
env_nounset);
env_setenv("vbe_max_resolution", EV_VOLATILE, NULL, mode_set,
@ -717,12 +748,6 @@ vbe_set_mode(int modenum)
return (0);
}
static void *
vbe_farptr(uint32_t farptr)
{
return (PTOV((((farptr & 0xffff0000) >> 12) + (farptr & 0xffff))));
}
/*
* Verify existance of mode number or find mode by
* dimensions. If depth is not given, walk values 32, 24, 16, 8.
@ -731,15 +756,13 @@ static int
vbe_find_mode_xydm(int x, int y, int depth, int m)
{
struct modeinfoblock mi;
uint32_t farptr;
uint16_t *farptr;
uint16_t mode;
int safety, i;
int idx, nitems, i;
memset(vbe, 0, sizeof (*vbe));
if (biosvbe_info(vbe) != VBE_SUCCESS)
return (0);
if (vbe->VideoModePtr == 0)
return (0);
if (m != -1)
i = 8;
@ -748,17 +771,17 @@ vbe_find_mode_xydm(int x, int y, int depth, int m)
else
i = depth;
nitems = vbe_mode_list_size / sizeof(*vbe_mode_list);
while (i > 0) {
farptr = vbe->VideoModePtr;
safety = 0;
while ((mode = *(uint16_t *)vbe_farptr(farptr)) != 0xffff) {
safety++;
farptr += 2;
if (safety == VESA_MODE_COUNT)
for (idx = 0; idx < nitems; idx++) {
mode = vbe_mode_list[idx];
if (mode == 0xffff)
break;
if (biosvbe_get_mode_info(mode, &mi) != VBE_SUCCESS) {
continue;
}
/* we only care about linear modes here */
if (vbe_mode_is_supported(&mi) == 0)
continue;
@ -910,9 +933,8 @@ void
vbe_modelist(int depth)
{
struct modeinfoblock mi;
uint32_t farptr;
uint16_t mode;
int nmodes = 0, safety = 0;
int nmodes, idx, nentries;
int ddc_caps;
uint32_t width, height;
bool edid = false;
@ -948,6 +970,7 @@ vbe_modelist(int depth)
if (vbe_get_flatpanel(&width, &height))
printf(": Panel %dx%d\n", width, height);
nmodes = 0;
memset(vbe, 0, sizeof (*vbe));
memcpy(vbe->VbeSignature, "VBE2", 4);
if (biosvbe_info(vbe) != VBE_SUCCESS)
@ -958,26 +981,19 @@ vbe_modelist(int depth)
vbe_print_vbe_info(vbe);
printf("Modes: ");
farptr = vbe->VideoModePtr;
if (farptr == 0)
goto done;
while ((mode = *(uint16_t *)vbe_farptr(farptr)) != 0xffff) {
safety++;
farptr += 2;
if (safety == VESA_MODE_COUNT) {
printf("[?] ");
nentries = vbe_mode_list_size / sizeof(*vbe_mode_list);
for (idx = 0; idx < nentries; idx++) {
mode = vbe_mode_list[idx];
if (mode == 0xffff)
break;
}
if (biosvbe_get_mode_info(mode, &mi) != VBE_SUCCESS)
continue;
/* we only care about linear modes here */
if (vbe_mode_is_supported(&mi) == 0)
continue;
/* we found some mode so reset safety counter */
safety = 0;
/* apply requested filter */
if (depth != -1 && mi.BitsPerPixel != depth)
continue;