From 61760f9301427ea56a62ec02af3d0d8ae4745be7 Mon Sep 17 00:00:00 2001
From: Danny Holman <dholman@gymli.org>
Date: Mon, 27 May 2024 13:58:00 -0500
Subject: drivers: create a subdir just for driver code

Create a subdirectory branching from the project root. This directory
will contain nothing but driver and device code.

Signed-off-by: Danny Holman <dholman@gymli.org>
---
 arch/i386/kernel/framebuffer.c | 105 -----------------------------------------
 1 file changed, 105 deletions(-)
 delete mode 100644 arch/i386/kernel/framebuffer.c

(limited to 'arch/i386/kernel/framebuffer.c')

diff --git a/arch/i386/kernel/framebuffer.c b/arch/i386/kernel/framebuffer.c
deleted file mode 100644
index 602bddb..0000000
--- a/arch/i386/kernel/framebuffer.c
+++ /dev/null
@@ -1,105 +0,0 @@
-#include <kernel/vga.h>
-#include <kernel/paging.h>
-#include <kernel/pic.h>
-#include <kernel/string.h>
-#include <stddef.h>
-#include <stdint.h>
-
-static const size_t VGA_WIDTH = 80;
-static const size_t VGA_HEIGHT = 25;
-static uint16_t *const VGA_MEMORY = (uint16_t*)0xC03FF000;
-
-static size_t fb_row;
-static size_t fb_column;
-static uint8_t fb_color;
-static uint16_t *framebuffer;
-
-void _enable_cursor(uint8_t cursor_start, uint8_t cursor_end) {
-        outb(0x3D4, 0x0A);
-        outb(0x3D5, (inb(0x3D5) & 0xC0) | cursor_start);
-
-        outb(0x3D4, 0x0B);
-        outb(0x3D5, (inb(0x3D5) & 0xE0) | cursor_end);
-}
-
-void _update_cursor(size_t x, size_t y) {
-        uint16_t pos = y * VGA_WIDTH + x;
-        
-        outb(0x3D4, 0x0F);
-        outb(0x3D5, (uint8_t)(pos & 0xFF));
-        outb(0x3D4, 0x0E);
-        outb(0x3D5, (uint8_t)((pos >> 8) & 0xFF));
-}
-
-void _fb_putentryat(unsigned char c, uint8_t color, size_t x, size_t y) {
-        const size_t index = y * VGA_WIDTH + x;
-        framebuffer[index] = vga_entry(c, color);
-}
-
-void _fb_scroll(void) {
-        for (size_t i = 0; i < VGA_HEIGHT-1; i++) {
-                for (size_t j = 0; j < VGA_WIDTH; j++)
-                        framebuffer[i * VGA_WIDTH + j] = VGA_MEMORY[(i+1) * VGA_WIDTH + j];
-        }
-}
-
-void fb_init(void) {
-        map_page(NULL, 0xB8000, (uintptr_t)VGA_MEMORY, 0x003);
-
-        fb_row = 0;
-        fb_column = 0;
-        fb_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
-        framebuffer = VGA_MEMORY;
-        for (size_t y = 0; y < VGA_HEIGHT; y++) {
-                for (size_t x = 0; x < VGA_WIDTH; x++)
-                        _fb_putentryat(' ', fb_color, x, y);
-        }
-        _enable_cursor(0, 0);
-        _update_cursor(0, 0);
-}
-
-void fb_setcolor(uint8_t color) {
-        fb_color = color;
-}
-
-void fb_setpos(int x, int y) {
-        fb_row = y;
-        fb_column = x;
-}
-
-void fb_putchar(char c) {
-        unsigned char uc = c;
-        switch (uc) {
-                case '\r':
-                        fb_column = 0;
-                        break;
-                case '\n':
-                        fb_column = 0;
-                        if (++fb_row == VGA_HEIGHT) {
-                                fb_row--;
-                                _fb_scroll();
-                        }
-                        break;
-                case '\t':
-                        fb_column += 4;
-                        if (++fb_column == VGA_WIDTH) {
-                                fb_column = 4;
-                                if (++fb_row == VGA_HEIGHT) {
-                                        fb_row--;
-                                        _fb_scroll();
-                                }
-                        }
-                        break;
-                default:
-                        _fb_putentryat(uc, fb_color, fb_column, fb_row);
-                        if (++fb_column == VGA_WIDTH) {
-                                fb_column = 0;
-                                if (++fb_row == VGA_HEIGHT) {
-                                        fb_row--;
-                                        _fb_scroll();
-                                }
-                        }
-                        break;
-        }
-        _update_cursor(fb_column, fb_row+1);
-}
-- 
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