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lfbvideo: re-add old kludge vidmem locator as an option

This commit is contained in:
K. Lange 2018-10-21 20:32:02 +09:00
parent 30b0b9477b
commit 6898766fa0
1 changed files with 44 additions and 0 deletions
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44
modules/lfbvideo.c
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@ -382,6 +382,47 @@ static void graphics_install_preset(uint16_t w, uint16_t h) {
finalize_graphics("preset");
}
static void graphics_install_kludge(uint16_t w, uint16_t h) {
uint32_t * herp = (uint32_t *)0xA0000;
herp[0] = 0xA5ADFACE;
herp[1] = 0xFAF42943;
for (int i = 2; i < 1000; i += 2) {
herp[i] = 0xFF00FF00;
herp[i+1] = 0x00FF00FF;
}
for (uintptr_t fb_offset = 0xE0000000; fb_offset < 0xFF000000; fb_offset += 0x01000000) {
/* Enable the higher memory */
for (uintptr_t i = fb_offset; i <= fb_offset + 0xFF0000; i += 0x1000) {
dma_frame(get_page(i, 1, kernel_directory), 0, 1, i);
}
/* Go find it */
for (uintptr_t x = fb_offset; x < fb_offset + 0xFF0000; x += 0x1000) {
if (((uintptr_t *)x)[0] == 0xA5ADFACE && ((uintptr_t *)x)[1] == 0xFAF42943) {
lfb_vid_memory = (uint8_t *)x;
debug_print(INFO, "Had to futz around, but found video memory at 0x%x", lfb_vid_memory);
goto mem_found;
}
}
}
mem_found:
lfb_resolution_x = w;
lfb_resolution_y = h;
lfb_resolution_s = w * 4;
lfb_resolution_b = 32;
for (uintptr_t i = (uintptr_t)lfb_vid_memory; i <= (uintptr_t)lfb_vid_memory + w * h * 4; i += 0x1000) {
page_t * p = get_page(i, 1, kernel_directory);
dma_frame(p, 0, 1, i);
p->pat = 1;
p->writethrough = 1;
p->cachedisable = 1;
}
finalize_graphics("kludge");
}
#define SVGA_IO_BASE (vmware_io)
#define SVGA_IO_MUL 1
#define SVGA_INDEX_PORT 0
@ -526,6 +567,9 @@ static int init(void) {
} else if (!strcmp(argv[0],"preset")) {
/* Set by bootloader (UEFI) */
graphics_install_preset(x,y);
} else if (!strcmp(argv[0],"kludge")) {
/* Old hack to find vid memory from the VGA window */
graphics_install_kludge(x,y);
} else {
debug_print(WARNING, "Unrecognized video adapter: %s", argv[0]);
}