Kernel: Introduce basic pre-kernel environment

This implements a simple bootloader that is capable of loading ELF64
kernel images. It does this by using QEMU/GRUB to load the kernel image
from disk and pass it to our bootloader as a Multiboot module.

The bootloader then parses the ELF image and sets it up appropriately.
The kernel's entry point is a C++ function with architecture-native
code.

Co-authored-by: Liav A <liavalb@gmail.com>

1 files changed, 0 insertions, 82 deletions

diff --git a/Kernel/StdLib.cpp b/Kernel/StdLib.cpp
index dc8da48252..a4487d36c6 100644
--- a/Kernel/StdLib.cpp
+++ b/Kernel/StdLib.cpp
@@ -236,48 +236,6 @@ bool copy_from_user(void* dest_ptr, const void* src_ptr, size_t n)
     return true;
 }
 
-void* memcpy(void* dest_ptr, const void* src_ptr, size_t n)
-{
-    size_t dest = (size_t)dest_ptr;
-    size_t src = (size_t)src_ptr;
-    // FIXME: Support starting at an unaligned address.
-    if (!(dest & 0x3) && !(src & 0x3) && n >= 12) {
-        size_t size_ts = n / sizeof(size_t);
-#if ARCH(I386)
-        asm volatile(
-            "rep movsl\n"
-            : "=S"(src), "=D"(dest)
-            : "S"(src), "D"(dest), "c"(size_ts)
-            : "memory");
-#else
-        asm volatile(
-            "rep movsq\n"
-            : "=S"(src), "=D"(dest)
-            : "S"(src), "D"(dest), "c"(size_ts)
-            : "memory");
-#endif
-        n -= size_ts * sizeof(size_t);
-        if (n == 0)
-            return dest_ptr;
-    }
-    asm volatile(
-        "rep movsb\n" ::"S"(src), "D"(dest), "c"(n)
-        : "memory");
-    return dest_ptr;
-}
-
-void* memmove(void* dest, const void* src, size_t n)
-{
-    if (dest < src)
-        return memcpy(dest, src, n);
-
-    u8* pd = (u8*)dest;
-    const u8* ps = (const u8*)src;
-    for (pd += n, ps += n; n--;)
-        *--pd = *--ps;
-    return dest;
-}
-
 const void* memmem(const void* haystack, size_t haystack_length, const void* needle, size_t needle_length)
 {
     return AK::memmem(haystack, haystack_length, needle, needle_length);
@@ -297,46 +255,6 @@ const void* memmem(const void* haystack, size_t haystack_length, const void* nee
     return true;
 }
 
-void* memset(void* dest_ptr, int c, size_t n)
-{
-    size_t dest = (size_t)dest_ptr;
-    // FIXME: Support starting at an unaligned address.
-    if (!(dest & 0x3) && n >= 12) {
-        size_t size_ts = n / sizeof(size_t);
-        size_t expanded_c = explode_byte((u8)c);
-#if ARCH(I386)
-        asm volatile(
-            "rep stosl\n"
-            : "=D"(dest)
-            : "D"(dest), "c"(size_ts), "a"(expanded_c)
-            : "memory");
-#else
-        asm volatile(
-            "rep stosq\n"
-            : "=D"(dest)
-            : "D"(dest), "c"(size_ts), "a"(expanded_c)
-            : "memory");
-#endif
-        n -= size_ts * sizeof(size_t);
-        if (n == 0)
-            return dest_ptr;
-    }
-    asm volatile(
-        "rep stosb\n"
-        : "=D"(dest), "=c"(n)
-        : "0"(dest), "1"(n), "a"(c)
-        : "memory");
-    return dest_ptr;
-}
-
-size_t strlen(const char* str)
-{
-    size_t len = 0;
-    while (*(str++))
-        ++len;
-    return len;
-}
-
 size_t strnlen(const char* str, size_t maxlen)
 {
     size_t len = 0;