fix: gdt add stack

libbozo/headers/string.h

@@ -8,3 +8,4 @@ int strncmp(const char *s1, const char *s2, size_t n);
 size_t strlen(const char *str);
 char *strstr(const char *haystack, const char *needle);
 void *memcpy(void *dest, const void *src, size_t n);
+int memcmp(const void *s1, const void *s2, size_t n);

libbozo/headers/sys/io.h

@@ -13,3 +13,15 @@ static inline uint8_t inb(uint16_t port)
 	__asm__ volatile("inb %w1, %b0" : "=a"(ret) : "Nd"(port) : "memory");
 	return ret;
 }
+
+static inline void outw(uint16_t port, uint16_t val)
+{
+	__asm__ volatile("outb %b0, %w1" : : "a"(val), "Nd"(port) : "memory");
+}
+
+static inline uint16_t inw(uint16_t port)
+{
+	uint8_t ret;
+	__asm__ volatile("inb %w1, %b0" : "=a"(ret) : "Nd"(port) : "memory");
+	return ret;
+}

libbozo/src/string/memcmp.c

@@ -0,0 +1,13 @@
+#include <stddef.h>
+
+int memcmp(const void *s1, const void *s2, size_t n)
+{
+    const char *str1 = s1;
+    const char *str2 = s2;
+    size_t i;
+    
+    if (n == 0)
+        return 0;
+    for (i = 0; str1[i] == str2[i] && i < n - 1; i++);
+    return str1[i] - str2[i];
+}

src/gdt/gdt.c

@@ -50,9 +50,11 @@ void initGdt()
 	    .base = 0, .limit = 0xFFFFF, .access_byte = 0x92, .flags = 0xC};
 	encodeGdtEntry(gdt_entries[2], gdt_entry_kernel_mode_data_segment);
 
-	struct gdt_entry gdt_entry_kernel_mode_stack_segment = {
-	    .base = 0x0, .limit = 0x0, .access_byte = 0x97, .flags = 0x0D};
-	encodeGdtEntry(gdt_entries[3], gdt_entry_kernel_mode_data_segment);
+    struct gdt_entry gdt_entry_kernel_mode_stack_segment = { .base = 0x0,
+                                                             .limit = 0x0,
+                                                             .access_byte = 0x97,
+                                                             .flags = 0x0D };
+    encodeGdtEntry(gdt_entries[3], gdt_entry_kernel_mode_stack_segment);
 
 	struct gdt_entry gdt_entry_user_mode_code_segment = {
 	    .base = 0, .limit = 0xFFFFF, .access_byte = 0xFA, .flags = 0xC};
@@ -62,9 +64,11 @@ void initGdt()
 	    .base = 0, .limit = 0xFFFFF, .access_byte = 0xF2, .flags = 0xC};
 	encodeGdtEntry(gdt_entries[5], gdt_entry_user_mode_data_segment);
 
-	struct gdt_entry gdt_entry_user_mode_stack_segment = {
-	    .base = 0x0, .limit = 0x0, .access_byte = 0xF7, .flags = 0x0D};
-	encodeGdtEntry(gdt_entries[6], gdt_entry_user_mode_data_segment);
+    struct gdt_entry gdt_entry_user_mode_stack_segment = { .base = 0x0,
+                                                           .limit = 0x0,
+                                                           .access_byte = 0xF7,
+                                                           .flags = 0x0D };
+    encodeGdtEntry(gdt_entries[6], gdt_entry_user_mode_stack_segment);
 
 	memcpy((void *)gdtr.base, (void *)gdt_entries, (size_t)GDT_SIZE);