lesson 23, initial commit

23-fixes/kernel/kernel.c

@@ -0,0 +1,36 @@
+#include "../cpu/isr.h"
+#include "../drivers/screen.h"
+#include "kernel.h"
+#include "../libc/string.h"
+#include "../libc/mem.h"
+
+void main() {
+    isr_install();
+    irq_install();
+
+    kprint("Type something, it will go through the kernel\n"
+        "Type END to halt the CPU or PAGE to request a kmalloc()\n> ");
+}
+
+void user_input(char *input) {
+    if (strcmp(input, "END") == 0) {
+        kprint("Stopping the CPU. Bye!\n");
+        asm volatile("hlt");
+    } else if (strcmp(input, "PAGE") == 0) {
+        /* Lesson 22: Code to test kmalloc, the rest is unchanged */
+        u32 phys_addr;
+        u32 page = kmalloc(1000, 1, &phys_addr);
+        char page_str[16] = "";
+        hex_to_ascii(page, page_str);
+        char phys_str[16] = "";
+        hex_to_ascii(phys_addr, phys_str);
+        kprint("Page: ");
+        kprint(page_str);
+        kprint(", physical address: ");
+        kprint(phys_str);
+        kprint("\n");
+    }
+    kprint("You said: ");
+    kprint(input);
+    kprint("\n> ");
+}

23-fixes/kernel/kernel.h

@@ -0,0 +1,6 @@
+#ifndef KERNEL_H
+#define KERNEL_H
+
+void user_input(char *input);
+
+#endif