From d4349352a57eb00ce411b4c0542d3207357aecbe Mon Sep 17 00:00:00 2001
From: Aleksa Vuckovic <aleksav013@gmail.com>
Date: Wed, 3 Aug 2022 21:28:15 +0200
Subject: drawing lines to fb

---
 kernel/main.c | 100 ++++++----------------------------------------------------
 1 file changed, 9 insertions(+), 91 deletions(-)

(limited to 'kernel/main.c')

diff --git a/kernel/main.c b/kernel/main.c
index 79039e6..d868b42 100644
--- a/kernel/main.c
+++ b/kernel/main.c
@@ -1,102 +1,20 @@
 #include <stdint.h>
-
-struct mb2_tag_header {
-	uint32_t type;
-	uint32_t size;
-} __attribute__((packed, aligned(8)));
-typedef struct mb2_tag_header mb2_tag_header;
-
-struct mb2_tag_fb {
-	uint32_t type;
-	uint32_t size;
-	uint64_t framebuffer_addr;
-	uint32_t framebuffer_pitch;
-	uint32_t framebuffer_width;
-	uint32_t framebuffer_height;
-	uint8_t framebuffer_bpp;
-	uint8_t framebuffer_type;
-} __attribute__((packed, aligned(8)));
-typedef struct mb2_tag_fb mb2_tag_fb;
-
-// multiboot2 magic check
-#define MB2_MAGIC		0x36D76289
-
-// multiboot2 tag
-#define MB2_TAG_END		0
-#define MB2_TAG_CMDLINE		1
-#define MB2_TAG_BOOTLOADER	2
-#define MB2_TAG_MODULES		3
-#define MB2_TAG_MEM		4
-#define MB2_TAG_BIOS		5
-#define MB2_TAG_MMAP		6
-#define MB2_TAG_VBE		7
-#define MB2_TAG_FB		8
-
-void breakpoint(void)
-{
-	__asm__ volatile ("xchgw %bx, %bx;");
-}
-
-void put_in_r8(uint64_t value)
-{
-	__asm__ volatile ("movq %0, %%r8;" : : "r"(value) : "%r8");
-}
-
-void put_in_r9(uint64_t value)
-{
-	__asm__ volatile ("movq %0, %%r9;" : : "r"(value) : "%r9");
-}
-
-void put_in_r10(uint64_t value)
-{
-	__asm__ volatile ("movq %0, %%r10;" : : "r"(value) : "%r10");
-}
+#include <multiboot2.h>
+#include <graphics.h>
+#include <debug.h>
 
 int kernel_main(mb2_tag_header* multiboot_bootinfo, uint32_t multiboot_magic)
 {
-	if (multiboot_magic != MB2_MAGIC) {
-		// not loaded by multiboot2 bootloader
-		__asm__ volatile ("hlt;");
-	}
-
-	// we will store framebuffer information here
-	static mb2_tag_fb* tag_fb;
+	init_fb(multiboot_bootinfo, multiboot_magic);
 
-	// skip first 8 bytes (total_size + reserved)
-	mb2_tag_header* tag_header = multiboot_bootinfo + 1;
-
-	while (tag_header->type != MB2_TAG_END) {
-		// process tag_type
-		switch(tag_header->type) {
-			case MB2_TAG_FB:
-				tag_fb = (mb2_tag_fb*)tag_header;
-				break;
-			default:
-				break;
+	static uint32_t color = BLACK;
+	for (uint32_t x = 0 ; x < fb.width; x++) {
+		for (uint32_t y = 0; y < fb.height; y++) {
+			fb_draw_pixel(fb, x, y, color);
 		}
-
-		// next mb2_tag
-		tag_header += tag_header->size / 8 + ((tag_header->size % 8) > 0);
 	}
 
-	uint64_t* framebuffer_addr = (uint64_t*)tag_fb->framebuffer_addr;
-	uint32_t framebuffer_width = tag_fb->framebuffer_width;
-	uint32_t framebuffer_height = tag_fb->framebuffer_height;
-	//uint8_t framebuffer_bpp = tag_fb->framebuffer_bpp;
-	uint32_t framebuffer_pitch = tag_fb->framebuffer_pitch;
-
-	put_in_r8(framebuffer_width);
-	put_in_r9(framebuffer_height);
-	put_in_r10(framebuffer_pitch);
-	breakpoint();
-
-	uint32_t value = 0x0000;
-	for (uint32_t x = 0 ; x < framebuffer_width; x++) {
-		for (uint32_t y = 0; y < framebuffer_height; y++) {
-			framebuffer_addr[y*framebuffer_width + x] = value;
-			value += 0x250;
-		}
-	}
+	fb_draw_line(fb, 0, 0, 100, 1200, WHITE);
 
 	return 0;
 }
-- 
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