GDT init (load + flush)

src/kmain.c

@@ -4,6 +4,8 @@
 #include "io/term.h"
 #include "io/printf.h"
 #include "io/serial.h"
+#include "mem/gdt.h"
+#include "mem/utils.h"
 
 // Limine version used
 __attribute__((used, section(".limine_requests")))
@@ -24,74 +26,6 @@ static volatile LIMINE_REQUESTS_END_MARKER;
 
 struct limine_framebuffer* framebuffer;
 
-// We won't be linked to standard library, but still need the basic mem* functions
-// so everything goes allright with the compiler
-
-// We use the "restrict" keyword on pointers so that the compiler knows it can
-// do more optimization on them (and as it's a much used function, it's good to
-// be able to do that)
-void* memcpy(void* restrict dest, const void* restrict src, size_t n)
-{
-	uint8_t* restrict pdest = (uint8_t* restrict)dest;
-	const uint8_t* restrict psrc = (const uint8_t* restrict)src;
-
-	for (size_t i=0; i<n; i++)
-	{
-		pdest[i] = psrc[i];
-	}
-
-	return dest;
-}
-
-void* memset(void* s, int c, size_t n)
-{
-	uint8_t* p = (uint8_t*)s;
-
-	for (size_t i=0; i<n; i++)
-	{
-		p[i] = (uint8_t)c;
-	}
-
-	return s;
-}
-
-void* memmove(void *dest, const void* src, size_t n)
-{
-	uint8_t* pdest = (uint8_t*)dest;
-	const uint8_t* psrc = (uint8_t*)src;
-
-	if (src > dest)
-	{
-		for (size_t i=0; i<n; i++)
-		{
-			pdest[i] = psrc[i];
-		}
-	} else if (src < dest) 
-	{
-		for (size_t i=n; i>0; i--)
-		{
-			pdest[i-1] = psrc[i-1];
-		}
-	}
-	return dest;	
-}
-
-int memcmp(const void* s1, const void* s2, size_t n)
-{
-	const uint8_t* p1 = (const uint8_t*)s1;
-	const uint8_t* p2 = (const uint8_t*)s2;
-
-	for (size_t i=0; i<n; i++)
-	{
-		if (p1[i] != p2[i])
-		{
-			return p1[i] < p2[i] ? -1 : 1;
-		}
-	}
-
-	return 0;
-}
-
 // Panic 
 static void hcf()
 {
@@ -114,7 +48,10 @@ void kmain()
 
 	if (serial_init()) kputs("kernel: serial: error: Cannot init serial communication!");
 	
-	serial_kputs("\n\nkernel: serial: Hello, world from serial!");
+	serial_kputs("\n\nkernel: serial: Hello, world from serial!\n");
+
+	gdt_init();
+	serial_kputs("kernel: gdt: Initialized GDT!");
 
 	// Draw something
 	printf("%s, %s!", "Hello", "world");