From df44843bdf2c8bc5a784541511f0473a58547c79 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Wed, 16 Oct 2019 18:45:24 +0200
Subject: Added some VGA fallback features
---
src/kernel/graphics/vesa.c | 89 ++++++++++++++++++----------------------------
src/kernel/graphics/vesa.h | 17 +++++----
2 files changed, 43 insertions(+), 63 deletions(-)
(limited to 'src/kernel/graphics')
diff --git a/src/kernel/graphics/vesa.c b/src/kernel/graphics/vesa.c
index 3c55f70..6f6c3dc 100644
--- a/src/kernel/graphics/vesa.c
+++ b/src/kernel/graphics/vesa.c
@@ -1,11 +1,10 @@
#include "vesa.h"
-#include "graphics.h"
-#include "../system.h"
+#include "../io/io.h"
#include "../lib/lib.h"
#include "../paging/kheap.h"
-#include "../io/io.h"
-#include "font.h"
#include "../paging/paging.h"
+#include "../system.h"
+#include "font.h"
extern page_directory_t *kernel_directory;
@@ -14,7 +13,15 @@ void switch_to_vga() {
vesa_available = 0;
regs16_t regs;
regs.ax = 0x0003;
+ disable_paging();
int32(0x10, ®s);
+ enable_paging();
+
+ uint16_t *terminal_buffer = (uint16_t *) 0xB8000;
+ char *error = "This computer has no supported video drivers!";
+ for (size_t i = 0; i < strlen(error); i++)
+ terminal_buffer[i] = (uint16_t) error[i] | (uint16_t) 0x700;
+ panic("No VESA!");
}
struct edid_data get_edid() {
@@ -25,7 +32,9 @@ struct edid_data get_edid() {
regs.bx = 0x01; // BL
regs.es = get_segment(edid);
regs.di = get_offset(edid);
+ disable_paging();
int32(0x10, ®s);
+ enable_paging();
kfree(edid);
@@ -33,14 +42,12 @@ struct edid_data get_edid() {
}
void vbe_set_mode(unsigned short mode) {
- serial_write("Setting VBE mode: ");
- serial_write_hex(mode);
- serial_write("\n");
vesa_available = 0;
regs16_t regs;
regs.ax = 0x4F02;
regs.bx = mode;
- regs.bx = mode | (1 << 14);
+ regs.bx |= 0x4000;
+ regs.bx &= 0x7FFF;
disable_paging();
int32(0x10, ®s);
enable_paging();
@@ -98,8 +105,6 @@ struct vbe_mode_info *vbe_get_mode_info(uint16_t mode) {
mode_info_final->width = mode_info->width;
mode_info_final->height = mode_info->height;
mode_info_final->bpp = mode_info->bpp;
- mode_info_final->pitch = mode_info->pitch;
- mode_info_final->memory_model = mode_info->memory_model;
mode_info_final->framebuffer = mode_info->framebuffer;
return mode_info_final;
@@ -114,10 +119,8 @@ void set_optimal_resolution() {
struct vbe_mode_info *mode_info = vbe_get_mode_info(*mode);
if (mode_info->width >= highest_width &&
- (float) mode_info->width / (float) mode_info->height < 2.0 &&
- (mode_info->attributes & 0x1) != 0x1 &&
- (mode_info->attributes & 0x90) != 0x90 &&
- mode_info->memory_model != 6) {
+ // (float) mode_info->width / (float) mode_info->height < 2.0 &&
+ mode_info->attributes & 0x80) {
highest = *mode;
highest_width = mode_info->width;
kfree(mode_info);
@@ -129,36 +132,32 @@ void set_optimal_resolution() {
struct vbe_mode_info *highest_info = vbe_get_mode_info(highest);
vbe_width = highest_info->width;
vbe_height = highest_info->height;
- vbe_bpp = highest_info->bpp / 8;
- vbe_pitch = highest_info->pitch;
- fb = (char *) highest_info->framebuffer;
- uint32_t fb_psize = vbe_width * vbe_height * vbe_bpp;
- for (uint32_t z = 0; z < fb_psize; z += 4096)
- alloc_frame(get_page((uint32_t) (fb + z), 1, kernel_directory), 1, 1);
-
- serial_write("Reached set mode!\n");
+ vbe_bpp = highest_info->bpp >> 3;
+ fb = highest_info->framebuffer;
+
+ serial_write("Using mode: ");
+ serial_write_dec(vbe_width);
+ serial_write("x");
+ serial_write_dec(vbe_height);
+ serial_write("x");
+ serial_write_dec(vbe_bpp << 3);
+ serial_write("\n");
+
+ uint32_t fb_size = vbe_width * vbe_height * vbe_bpp;
+ for (uint32_t z = 0; z < fb_size; z += 4096)
+ alloc_frame(get_page(fb + z, 1, kernel_directory), 1, 1);
vbe_set_mode(highest);
}
uint16_t terminal_x = 1;
uint16_t terminal_y = 1;
-uint32_t terminal_color = 0xFFFFFF;
+uint32_t terminal_color = 0xBEBEBE;
// char text[1024] = {0};
-void vesa_clear() {
- for (int i = 0; i < vbe_width * vbe_height * vbe_bpp; i++) {
- fb[i] = 0;
- fb[i + 1] = 0;
- fb[i + 2] = 0;
- }
-}
-
void vesa_set_pixel(uint16_t x, uint16_t y, uint32_t color) {
- unsigned pos = x * vbe_bpp + y * vbe_pitch;
- fb[pos] = color & 255;
- fb[pos + 1] = (color >> 8) & 255;
- fb[pos + 2] = (color >> 16) & 255;
+ uint32_t pixel = x * vbe_bpp + y * vbe_width * vbe_bpp + fb;
+ *((uint32_t *) pixel) = color;
}
void vesa_draw_char(char ch, int x, int y) {
@@ -174,33 +173,15 @@ void vesa_draw_char(char ch, int x, int y) {
}
}
-void vesa_draw_rectangle(int x1, int y1, int x2, int y2, int color) {
- char blue = color & 255;
- char green = (color >> 8) & 255;
- char red = (color >> 16) & 255;
- int pos1 = x1 * vbe_bpp + y1 * vbe_pitch;
- char *draw = &fb[pos1];
- for (int i = 0; i <= y2 - y1; i++) {
- for (int j = 0; j <= x2 - x1; j++) {
- draw[vbe_bpp * j] = blue;
- draw[vbe_bpp * j + 1] = green;
- draw[vbe_bpp * j + 2] = red;
- }
- draw += vbe_pitch;
- }
-}
-
void vesa_draw_string(char *data) {
- // vesa_clear(); // PAGE FAULT?!
int i = 0;
while (data[i] != '\0') {
vesa_draw_char(data[i], terminal_x, terminal_y);
terminal_x += 10;
i++;
}
- // vesa_draw_rectangle(terminal_x, terminal_y, terminal_x + 10, terminal_y + 16, 0xffffff);
}
void vesa_set_color(uint32_t color) {
terminal_color = color;
-}
\ No newline at end of file
+}
diff --git a/src/kernel/graphics/vesa.h b/src/kernel/graphics/vesa.h
index 4c78219..f58dcf4 100644
--- a/src/kernel/graphics/vesa.h
+++ b/src/kernel/graphics/vesa.h
@@ -99,11 +99,9 @@ struct vbe_mode_info_all {
*/
struct vbe_mode_info {
uint16_t attributes;
- uint16_t pitch;
uint16_t width;
uint16_t height;
uint8_t bpp;
- uint8_t memory_model;
uint32_t framebuffer;
} __attribute__ ((packed));
@@ -114,6 +112,12 @@ struct vbe_mode_info {
*/
struct edid_data get_edid();
+
+/**
+ * Forces switch to VGA, displays an error and halts the CPU
+ */
+void switch_to_vga();
+
/**
* Set the video mode to a specified resolution using
* a video mode code
@@ -149,18 +153,13 @@ int vbe_width;
int vbe_height;
/**
- * The bits per pixel (pixel width) of the current video mode
+ * The bytes per pixel (pixel width) of the current video mode
*/
int vbe_bpp;
-/**
- * The pitch (bytes per line) of the current video mode
- */
-int vbe_pitch;
-
/**
* The framebuffer interface
*/
-char *fb;
+uint32_t fb;
#endif
--
cgit v1.2.3