Update README to add a short description and legal notice so that california doesn't sue meHEADmain

1 files changed, 180 insertions, 0 deletions

diff --git a/src/kernel.c b/src/kernel.c
index 28b1dc8..97a42b5 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -6,6 +6,10 @@ This software is licensed under the ARPL. See LICENSE for details. */
 #include <stdint.h>
 #include "font8x8_basic.h"
 
+#define KB_DATA_PORT 0x60
+#define KB_STATUS_PORT 0x64
+#define KB_OBF 0x01
+
 /* check if compiler thinks we are targeting incorrect OS. */
 #if defined(__linux__)
 #error "you are not using a cross-compiler, this is bad. use an elf cross-compiler for ix86 targets, for example, i386-elf-gcc"
@@ -22,6 +26,7 @@ static uint32_t *g_framebuffer = NULL;
 static uint32_t g_width = 0;
 static uint32_t g_height = 0;
 static uint32_t g_default_color = 0xFFFFFF;
+static bool kbd_shifted = false;
 
 /* what in the dark magic? ok just dont touch one can hope */
 struct multiboot_info {
@@ -55,6 +60,138 @@ struct multiboot_info {
 	uint8_t  color_info[6];
 } __attribute__((packed));
 
+static const char scancode_to_ascii[128] __attribute__((section(".text"))) = {
+	[0x29] = '`',
+	[0x02] = '1',
+	[0x03] = '2',
+	[0x04] = '3',
+	[0x05] = '4',
+	[0x06] = '5',
+	[0x07] = '6',
+	[0x08] = '7',
+	[0x09] = '8',
+	[0x0A] = '9',
+	[0x0B] = '0',
+	[0x0C] = '-',
+	[0x0D] = '=',
+	[0x0E] = '\b',
+
+	[0x10] = 'q',
+	[0x11] = 'w',
+	[0x12] = 'e',
+	[0x13] = 'r',
+	[0x14] = 't',
+	[0x15] = 'y',
+	[0x16] = 'u',
+	[0x17] = 'i',
+	[0x18] = 'o',
+	[0x19] = 'p',
+
+	[0x1A] = '[',
+	[0x1B] = ']',
+	[0x1C] = '\n',
+	[0x2B] = '\\',
+
+	[0x1E] = 'a',
+	[0x1F] = 's',
+	[0x20] = 'd',
+	[0x21] = 'f',
+	[0x22] = 'g',
+	[0x23] = 'h',
+	[0x24] = 'j',
+	[0x25] = 'k',
+	[0x26] = 'l',
+
+	[0x27] = ';',
+	[0x28] = '\'',
+
+	[0x2C] = 'z',
+	[0x2D] = 'x',
+	[0x2E] = 'c',
+	[0x2F] = 'v',
+	[0x30] = 'b',
+	[0x31] = 'n',
+	[0x32] = 'm',
+	[0x33] = ',',
+	[0x34] = '.',
+	[0x35] = '/',
+
+	[0x39] = ' ',
+};
+
+static const char scancode_to_ascii_shifted[128] __attribute__((section(".text"))) = {
+	[0x29] = '~',
+	[0x02] = '!',
+	[0x03] = '@',
+	[0x04] = '#',
+	[0x05] = '$',
+	[0x06] = '%',
+	[0x07] = '^',
+	[0x08] = '&',
+	[0x09] = '*',
+	[0x0A] = '(',
+	[0x0B] = ')',
+	[0x0C] = '_',
+	[0x0D] = '+',
+	[0x0E] = '\b',
+
+	[0x10] = 'Q',
+	[0x11] = 'W',
+	[0x12] = 'E',
+	[0x13] = 'R',
+	[0x14] = 'T',
+	[0x15] = 'Y',
+	[0x16] = 'U',
+	[0x17] = 'I',
+	[0x18] = 'O',
+	[0x19] = 'P',
+
+	[0x1A] = '{',
+	[0x1B] = '}',
+	[0x1C] = '\n',
+	[0x2B] = '|',
+
+	[0x1E] = 'A',
+	[0x1F] = 'S',
+	[0x20] = 'D',
+	[0x21] = 'F',
+	[0x22] = 'G',
+	[0x23] = 'H',
+	[0x24] = 'J',
+	[0x25] = 'K',
+	[0x26] = 'L',
+
+	[0x27] = ':',
+	[0x28] = '"',
+
+	[0x2C] = 'Z',
+	[0x2D] = 'X',
+	[0x2E] = 'C',
+	[0x2F] = 'V',
+	[0x30] = 'B',
+	[0x31] = 'N',
+	[0x32] = 'M',
+	[0x33] = '<',
+	[0x34] = '>',
+	[0x35] = '?',
+
+	[0x39] = ' ',
+};
+
+static inline void outb(uint16_t port, uint8_t val) {
+	asm volatile("outb %0, %1" : : "a"(val), "Nd"(port));
+}
+
+static inline uint8_t inb(uint16_t port) {
+	uint8_t ret;
+	asm volatile("inb %1, %0" : "=a"(ret) : "Nd"(port));
+	return ret;
+}
+
+uint8_t keyboard_read_scan_code() {
+	while (!(inb(KB_STATUS_PORT) & KB_OBF));
+	return inb(KB_DATA_PORT);
+}
 void draw_char(int x, int y, int c, uint32_t color, uint32_t *framebuffer, uint32_t width)
 {
 	char *glyph = font8x8_basic[(unsigned char)c];
@@ -117,6 +254,46 @@ void term_printf(const char *str)
 	}
 }
 
+void shell() {
+	term_set_color(0xFCD24D);
+	term_printf("\n> ");
+	term_set_color(0xFFFFFF);
+	while (1) {
+		uint8_t scancode = keyboard_read_scan_code();
+	
+		// shift or no shift????
+		if (scancode == 0x2A) kbd_shifted = true;
+		if (scancode == 0xAA) kbd_shifted = false;
+
+		// we dont care abt key releases
+		if (scancode & 0x80) continue;
+
+		char c = kbd_shifted ? scancode_to_ascii_shifted[scancode] : scancode_to_ascii[scancode];
+
+		if (c) {
+			if (c == '\n') {
+				// enter, interpret command
+				// we dont know what to do with command yet so new prompt and pretend we did something
+				// we also need to add like handling of the current command, do that soon!
+				term_set_color(0xFCD24D);
+				term_printf("\n> ");
+				term_set_color(0xFFFFFF);
+			}
+			if (c == '\b') {
+				// stupid nut keep trying to use backspace when its not done yet, just add a handler placeholder
+				term_printf("\n---\nyou stupid nut!\n");
+				term_printf("we dont have backspace yet, stop trying to when testing! get better\n");
+				term_set_color(0xFCD24D);
+				term_printf("\n> ");
+				term_set_color(0xFFFFFF);
+			}
+			else {
+				term_printf(&c);
+			}
+		}
+	}
+}
+
 void kernel_main(struct multiboot_info *mbi) 
 {
 	// check if framebuffer info is available (bit 12)
@@ -142,6 +319,9 @@ void kernel_main(struct multiboot_info *mbi)
 	term_printf("---\n");
 	term_printf("https://arslaancodes.com\n");
 
+	term_printf("\n---\nShell:\n");
+	shell();
+
 	// if theres nothing left to do, halt the cpu or else cooked
 	// our boot.s already does this but better to be safe than sorry
 	while (1) {