aarch64 support

Makefile

@@ -25,10 +25,17 @@ ifeq (${ARCH},riscv64)
 	UEFI := true
 endif
 
+ifeq (${ARCH},aarch64)
+	LIMINE_BOOT_VARIATION := AA64
+	UEFI := true
+endif
+
 ifneq (${UEFI},)
 	RUN_OPTS := ovmf-${ARCH}
 	ifeq (${ARCH},riscv64)
 		QEMU_OPTS += -drive if=pflash,unit=0,format=raw,file=ovmf/ovmf-riscv64/OVMF.fd -M virt
+	else ifeq (${ARCH},aarch64)
+		QEMU_OPTS += -M virt -bios ovmf/ovmf-${ARCH}/OVMF.fd
 	else
 		QEMU_OPTS += -bios ovmf/ovmf-${ARCH}/OVMF.fd
 	endif
@@ -148,6 +155,12 @@ ovmf-riscv64: ovmf
 		cd ovmf/ovmf-riscv64 && curl -o OVMF.fd https://retrage.github.io/edk2-nightly/bin/RELEASERISCV64_VIRT_CODE.fd && dd if=/dev/zero of=OVMF.fd bs=1 count=0 seek=33554432; \
 	fi
 
+ovmf-aarch64:
+	mkdir -p ovmf/ovmf-aarch64
+	@if [ ! -d "ovmf/ovmf-aarch64/OVMF.fd" ]; then \
+		cd ovmf/ovmf-aarch64 && curl -o OVMF.fd https://retrage.github.io/edk2-nightly/bin/RELEASEAARCH64_QEMU_EFI.fd; \
+	fi
+
 # In debug mode, open a terminal and run this command:
 # gdb target/x86_64-unknown-none/debug/CappuccinOS.elf -ex "target remote :1234"
 
@@ -157,7 +170,10 @@ run-x86_64:
 	qemu-system-x86_64 ${QEMU_OPTS}
 
 run-riscv64:
-	qemu-system-riscv64 ${QEMU_OPTS} -M virt -cpu rv64 -device ramfb -device qemu-xhci -device usb-kbd -device virtio-scsi-pci,id=scsi -device scsi-hd,drive=hd0
+	qemu-system-riscv64 ${QEMU_OPTS} -cpu rv64 -device ramfb -device qemu-xhci -device usb-kbd -device virtio-scsi-pci,id=scsi -device scsi-hd,drive=hd0
+
+run-aarch64:
+	qemu-system-aarch64 ${QEMU_OPTS} -cpu cortex-a72 -device ramfb -device qemu-xhci -device usb-kbd -boot d
 
 line-count:
 		cloc --quiet --exclude-dir=bin --csv src/ | tail -n 1 | awk -F, '{print $$5}'

src/arch/aarch64/aarch64-unknown-none.json

@@ -0,0 +1,22 @@
+{
+    "data-layout": "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128",
+    "llvm-target": "aarch64-unknown-none",
+    "target-endian": "little",
+    "target-pointer-width": "64",
+    "target-c-int-width": "32",
+    "features": "+v8a,+strict-align,+neon,+fp-armv8",
+    "os": "CappuccinOS",
+    "arch": "aarch64",
+    "linker": "rust-lld",
+    "linker-flavor": "ld.lld",
+    "pre-link-args": {
+        "ld.lld": [
+            "--fix-cortex-a53-843419",
+            "-maarch64elf",
+            "--script=./src/arch/aarch64/linker.ld"
+        ]
+    },
+    "panic-strategy": "abort",
+    "exe-suffix": ".elf",
+    "disable-redzone": true
+}

src/arch/aarch64/io.rs

@@ -0,0 +1,54 @@
+#[inline(always)]
+pub fn outb(port: u16, value: u8) {
+    return;
+}
+
+#[inline(always)]
+pub fn inb(port: u16) -> u8 {
+    return 0;
+}
+
+#[inline(always)]
+pub fn outw(port: u16, value: u16) {
+    return;
+}
+
+#[inline(always)]
+pub fn inw(port: u16) -> u16 {
+    return 0;
+}
+
+/// Reads `count` 16-bit values from the specified `port` into the `buffer`.
+///
+/// # Safety
+///
+/// This function panics if the supplied buffer's size is smaller than `count`.
+#[inline(always)]
+pub unsafe fn insw(port: u16, buffer: *mut u16, count: usize) {
+    return;
+}
+
+/// Outputs `count` 16-bit values from the specified `port` into the `buffer`.
+///
+/// # Safety
+///
+/// This function panics if the supplied buffer's size is smaller than `count`.
+#[inline(always)]
+pub unsafe fn outsw(port: u16, buffer: *mut u16, count: usize) {
+    return;
+}
+
+#[inline(always)]
+pub fn outl(port: u16, value: u32) {
+    return;
+}
+
+#[inline(always)]
+pub fn inl(port: u16) -> u32 {
+    return 0;
+}
+
+#[inline(always)]
+pub fn io_wait() {
+    return;
+}

src/arch/aarch64/linker.ld

@@ -0,0 +1,63 @@
+/* Tell the linker that we want an aarch64 ELF64 output file */
+OUTPUT_FORMAT(elf64-littleaarch64)
+OUTPUT_ARCH(aarch64)
+
+/* We want the symbol _start to be our entry point */
+ENTRY(_start)
+
+/* Define the program headers we want so the bootloader gives us the right */
+/* MMU permissions */
+PHDRS
+{
+    text    PT_LOAD    FLAGS((1 << 0) | (1 << 2)) ; /* Execute + Read */
+    rodata  PT_LOAD    FLAGS((1 << 2)) ;            /* Read only */
+    data    PT_LOAD    FLAGS((1 << 1) | (1 << 2)) ; /* Write + Read */
+    dynamic PT_DYNAMIC FLAGS((1 << 1) | (1 << 2)) ; /* Dynamic PHDR for relocations */
+}
+
+SECTIONS
+{
+    /* We wanna be placed in the topmost 2GiB of the address space, for optimisations */
+    /* and because that is what the Limine spec mandates. */
+    /* Any address in this region will do, but often 0xffffffff80000000 is chosen as */
+    /* that is the beginning of the region. */
+    . = 0xffffffff80000000;
+
+    .text : {
+        *(.text .text.*)
+    } :text
+
+    /* Move to the next memory page for .rodata */
+    . += CONSTANT(MAXPAGESIZE);
+
+    .rodata : {
+        *(.rodata .rodata.*)
+    } :rodata
+
+    /* Move to the next memory page for .data */
+    . += CONSTANT(MAXPAGESIZE);
+
+    .data : {
+        *(.data .data.*)
+    } :data
+
+    /* Dynamic section for relocations, both in its own PHDR and inside data PHDR */
+    .dynamic : {
+        *(.dynamic)
+    } :data :dynamic
+
+    /* NOTE: .bss needs to be the last thing mapped to :data, otherwise lots of */
+    /* unnecessary zeros will be written to the binary. */
+    /* If you need, for example, .init_array and .fini_array, those should be placed */
+    /* above this. */
+    .bss : {
+        *(.bss .bss.*)
+        *(COMMON)
+    } :data
+
+    /* Discard .note.* and .eh_frame since they may cause issues on some hosts. */
+    /DISCARD/ : {
+        *(.eh_frame)
+        *(.note .note.*)
+    }
+}

src/arch/aarch64/mod.rs

@@ -0,0 +1 @@
+pub mod io;

src/arch/mod.rs

@@ -15,3 +15,9 @@ mod riscv64;
 
 #[cfg(target_arch = "riscv64")]
 pub use self::riscv64::*;
+
+#[cfg(target_arch = "aarch64")]
+mod aarch64;
+
+#[cfg(target_arch = "aarch64")]
+pub use self::aarch64::*;

src/drivers/fs/initramfs/mod.rs

@@ -228,9 +228,9 @@ impl Squashfs<'_> {
         };
         let table_size = header & 0x7FFF;
 
-        if table.len() >= 8192 {
-            panic!("Inode block is not less than 8KiB!");
-        }
+        // if table.len() >= 8192 {
+        //     panic!("Inode block is not less than 8KiB!");
+        // }
 
         let mut buffer: Vec<u8> = Vec::new();
 
@@ -485,22 +485,22 @@ impl<'a> VfsFile for BasicFileInode<'a> {
         // TODO: is this really how you're supposed to do this?
         let mut block_data: Vec<u8> = Vec::with_capacity(self.file_size as usize);
 
-        unsafe {
-            let data_table = self.header.squashfs.get_decompressed_table(
-                self.header.squashfs.data_table,
-                (
-                    false,
-                    Some(
-                        !self
-                            .header
-                            .squashfs
-                            .superblock
-                            .features()
-                            .uncompressed_data_blocks,
-                    ),
+        let data_table = self.header.squashfs.get_decompressed_table(
+            self.header.squashfs.data_table,
+            (
+                false,
+                Some(
+                    !self
+                        .header
+                        .squashfs
+                        .superblock
+                        .features()
+                        .uncompressed_data_blocks,
                 ),
-            );
+            ),
+        );
 
+        unsafe {
             core::ptr::copy_nonoverlapping(
                 data_table.as_ptr().add(self.block_offset as usize),
                 block_data.as_mut_ptr(),

src/drivers/serial.rs

@@ -68,6 +68,4 @@ pub fn write_serial(character: char) {
     unsafe {
         *UART = character;
     };
-
-    return;
 }

src/drivers/video/font.rs

@@ -1,7 +1,10 @@
-use alloc::vec::Vec;
+use alloc::{format, vec::Vec};
 
 use crate::{
-    drivers::fs::{initramfs::INITRAMFS, vfs::VfsFileSystem},
+    drivers::{
+        fs::{initramfs::INITRAMFS, vfs::VfsFileSystem},
+        serial::write_serial,
+    },
     libs::lazy::Lazy,
 };
 
@@ -48,5 +51,6 @@ pub static FONT: Lazy<PSFFont> = Lazy::new(|| {
         .read()
         .unwrap()
         .to_vec();
+
     PSFFont::from_file_data(file_data).expect("Failed to create terminal font!")
 });