kernel/aarch64: Add initial AARCH64 portaarch64

Signed-off-by: Ian Moffett <ian@osmora.org>

16 files changed, 835 insertions, 4 deletions

diff --git a/Makefile.in b/Makefile.in
index edf7193..95a419f 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -4,6 +4,7 @@ override PROMPT := printf "%s\t\t%s\n"
 ###############################
 # CFLAGS, QEMU flags + misc
 ###############################
+override BOOT_FW = @BOOT_FW@
 override ARCH = @ARCH@
 override HYRA_VERSION = @PACKAGE_VERSION@
 override PROMPT := printf "%s\t\t%s\n"
@@ -110,7 +111,7 @@ clean:
 iso:
 	mkdir -p iso_root/boot/
 	mkdir -p iso_root/EFI/BOOT/
-	cp stand/limine/BOOTX64.EFI iso_root/EFI/BOOT/
+	cp stand/limine/$(BOOT_FW) iso_root/EFI/BOOT/
 	mv ramfs.cpio iso_root/boot/
 	cp builddeps/limine.cfg stand/limine/limine-bios.sys \
 		stand/limine/limine-bios-cd.bin stand/limine/limine-uefi-cd.bin iso_root/
diff --git a/configure.ac b/configure.ac
index 08cf4dd..18398a4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,13 @@
-AC_INIT([Hyra], [1.5], [ian@osmora.org])
+AC_INIT([Hyra], [1.6], [ian@osmora.org])
+
+TARGET="amd64"
+BOOT_FW="BOOTX64.EFI"
+AC_ARG_ENABLE([aarch64],
+              [AS_HELP_STRING([--enable-aarch64], [Enable AARCH64 Support])],
+              [TARGET="aarch64"],
+              []
+)
+
 
 KERN_CFLAGS_AMD64="-fexceptions --std=gnu11 -ffreestanding -fno-stack-protector -fno-pic \\
 	-Werror=implicit -Werror=implicit-function-declaration \\
@@ -10,20 +19,41 @@ KERN_CFLAGS_AMD64="-fexceptions --std=gnu11 -ffreestanding -fno-stack-protector
 	-I sys/include/ -I sys/include/lib/ -D_KERNEL -Wno-pointer-sign -MMD \\
 	-Wno-gnu-zero-variadic-macro-arguments -Wno-language-extension-token -Wno-tautological-constant-out-of-range-compare -Wno-c23-extensions"
 
+
+KERN_CFLAGS_AARCH64="-fexceptions --std=gnu11 -ffreestanding -fno-stack-protector -fno-pic \\
+	-Werror=implicit -Werror=implicit-function-declaration \\
+	-Werror=implicit-int -Werror=int-conversion \\
+        -Werror=missing-prototypes                   \\
+	-Werror=incompatible-pointer-types -Werror=int-to-pointer-cast \\
+	-Werror=return-type -Wunused -pedantic \\
+	-I sys/include/ -I sys/include/lib/ -D_KERNEL -Wno-pointer-sign -MMD \\
+	-Wno-gnu-zero-variadic-macro-arguments -Wno-language-extension-token -Wno-tautological-constant-out-of-range-compare -Wno-c23-extensions"
+
+
 QEMU_FLAGS_AMD64="--enable-kvm -monitor stdio 	\\
 		          -M q35 -m 1G -smp 4 -cpu host  \\
 			      -cdrom Hyra.iso"
 
+KERN_CFLAGS="$KERN_CFLAGS_AMD64"
+
+if test "x$TARGET" = "xaarch64"
+then
+    KERN_CFLAGS="$KERN_CFLAGS_AARCH64"
+    BOOT_FW="BOOTAA64.EFI"
+fi
+
+
 HYRA_BUILDDATE=`export LANG=en_US.UTF-8 ; date`
 HYRA_BUILDBRANCH="`basename $PWD`"
 
 AC_SUBST(HYRA_BUILDDATE, [$HYRA_BUILDDATE])
 AC_SUBST(HYRA_BUILDBRANCH, [$HYRA_BUILDBRANCH])
 
-AC_SUBST(KERNEL_CFLAGS, [$KERN_CFLAGS_AMD64])
+AC_SUBST(KERNEL_CFLAGS, [$KERN_CFLAGS])
 AC_SUBST(QEMU_FLAGS, [$QEMU_FLAGS_AMD64])
 AC_SUBST(QEMU, [qemu-system-x86_64])
-AC_SUBST(ARCH, [amd64])
+AC_SUBST(BOOT_FW, [$BOOT_FW])
+AC_SUBST(ARCH, [$TARGET])
 AC_SUBST(TOOLCHAIN, [clang])
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT
diff --git a/sys/arch/aarch64/aarch64/acpi_machdep.c b/sys/arch/aarch64/aarch64/acpi_machdep.c
new file mode 100644
index 0000000..f077de3
--- /dev/null
+++ b/sys/arch/aarch64/aarch64/acpi_machdep.c
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <dev/acpi/acpi.h>
+#include <dev/acpi/acpivar.h>
+
+int
+acpi_init_madt(void)
+{
+    return 0;
+}
diff --git a/sys/arch/aarch64/aarch64/machdep.c b/sys/arch/aarch64/aarch64/machdep.c
new file mode 100644
index 0000000..1d34e56
--- /dev/null
+++ b/sys/arch/aarch64/aarch64/machdep.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/syslog.h>
+#include <sys/panic.h>
+#include <machine/cpu.h>
+
+struct cpu_info g_bsp_ci = {0};
+
+void
+cpu_startup(struct cpu_info *ci)
+{
+    /* TODO: STUB */
+    return;
+}
+
+void
+serial_init(void)
+{
+    /* TODO: STUB */
+    return;
+}
+
+void
+md_backtrace(void)
+{
+    /* TODO: STUB */
+    return;
+}
+
+void
+serial_putc(char c)
+{
+    /* TODO: STUB */
+    return;
+}
+
+/*
+ * Get the descriptor for the currently
+ * running processor.
+ */
+struct cpu_info *
+this_cpu(void)
+{
+    struct cpu_info *ci;
+
+    __ASMV("mrs %0, tpidr_el0" : "=r" (ci));
+    return ci;
+}
diff --git a/sys/arch/aarch64/aarch64/mp.c b/sys/arch/aarch64/aarch64/mp.c
new file mode 100644
index 0000000..4e07566
--- /dev/null
+++ b/sys/arch/aarch64/aarch64/mp.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <machine/cpu.h>
+
+#define pr_trace(fmt, ...) kprintf("cpu_mp: " fmt, ##__VA_ARGS__)
+
+void
+mp_bootstrap_aps(struct cpu_info *ci)
+{
+    for (;;);
+}
diff --git a/sys/arch/aarch64/aarch64/pmap.c b/sys/arch/aarch64/aarch64/pmap.c
new file mode 100644
index 0000000..b5ebda9
--- /dev/null
+++ b/sys/arch/aarch64/aarch64/pmap.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <machine/vas.h>
+#include <vm/pmap.h>
+
+struct vas
+pmap_read_vas(void)
+{
+    /* TODO: STUB */
+    struct vas vas = {0};
+    return vas;
+}
+
+void
+pmap_switch_vas(struct vas vas)
+{
+    /* TODO: STUB */
+    return;
+}
+
+int
+pmap_map(struct vas vas, vaddr_t va, paddr_t pa, vm_prot_t prot)
+{
+    /* TODO: STUB */
+    return 0;
+}
+
+int
+pmap_unmap(struct vas vas, vaddr_t va)
+{
+    /* TODO: STUB */
+    return 0;
+}
+
+void
+pmap_destroy_vas(struct vas vas)
+{
+    /* TODO: STUB */
+    return;
+}
diff --git a/sys/arch/aarch64/aarch64/proc_machdep.c b/sys/arch/aarch64/aarch64/proc_machdep.c
new file mode 100644
index 0000000..97902e5
--- /dev/null
+++ b/sys/arch/aarch64/aarch64/proc_machdep.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/proc.h>
+
+/*
+ * MD thread init code
+ *
+ * @p: New process.
+ * @parent: Parent of new process.
+ * @ip: Instruction pointer.
+ */
+int
+md_fork(struct proc *p, struct proc *parent, uintptr_t ip)
+{
+    /* TODO: STUB */
+    return 0;
+}
+
+void
+md_td_stackinit(struct proc *td, void *stack_top, struct exec_prog *prog)
+{
+    /* TODO: STUB */
+    return;
+}
+
+void
+setregs(struct proc *td, struct exec_prog *prog, uintptr_t stack)
+{
+    /* TODO: STUB */
+    return;
+}
+
+/*
+ * Startup a user thread.
+ *
+ * @td: Thread to start up.
+ */
+void
+md_td_kick(struct proc *td)
+{
+    /* TODO: STUB */
+    for (;;);
+}
diff --git a/sys/arch/aarch64/aarch64/reboot.c b/sys/arch/aarch64/aarch64/reboot.c
new file mode 100644
index 0000000..6d82133
--- /dev/null
+++ b/sys/arch/aarch64/aarch64/reboot.c
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/reboot.h>
+#include <sys/param.h>
+
+void
+cpu_reboot(int method)
+{
+    /* TODO: STUB */
+    for (;;);
+}
diff --git a/sys/arch/aarch64/conf/GENERIC b/sys/arch/aarch64/conf/GENERIC
new file mode 100644
index 0000000..5691685
--- /dev/null
+++ b/sys/arch/aarch64/conf/GENERIC
@@ -0,0 +1,5 @@
+// Kernel options
+option SERIAL_DEBUG yes
+
+// Kernel constants
+setval SCHED_NQUEUE 4
diff --git a/sys/arch/aarch64/conf/link.ld b/sys/arch/aarch64/conf/link.ld
new file mode 100644
index 0000000..c64cec3
--- /dev/null
+++ b/sys/arch/aarch64/conf/link.ld
@@ -0,0 +1,75 @@
+/* Tell the linker that we want an aarch64 ELF64 output file */
+OUTPUT_FORMAT(elf64-littleaarch64)
+OUTPUT_ARCH(aarch64)
+
+/* We want the symbol main to be our entry point */
+ENTRY(main)
+
+/* 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
+
+    .drivers : {
+        __drivers_init_start = .;
+        *(.drivers .drivers)
+        __drivers_init_end = .;
+    } :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
+
+    /* -- Cache line alignment -- */
+    . = ALIGN(64);
+    .data.cacheline_aligned : {
+        *(.data.cacheline_aligned)
+    }
+
+    /* Discard .note.* and .eh_frame since they may cause issues on some hosts. */
+    /DISCARD/ : {
+        *(.eh_frame)
+        *(.note .note.*)
+    }
+}
diff --git a/sys/arch/aarch64/pci/pci_machdep.c b/sys/arch/aarch64/pci/pci_machdep.c
new file mode 100644
index 0000000..fa92165
--- /dev/null
+++ b/sys/arch/aarch64/pci/pci_machdep.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <dev/pci/pci.h>
+
+pcireg_t
+pci_readl(struct pci_device *dev, uint32_t offset)
+{
+    /* TODO: STUB */
+    return 0;
+}
+
+void
+pci_writel(struct pci_device *dev, uint32_t offset, pcireg_t val)
+{
+    /* TODO: STUB */
+    return;
+}
+
+/*
+ * Map a BAR into kernel memory.
+ *
+ * @dev: Device of BAR to map.
+ * @barno: BAR number to map.
+ * @vap: Resulting virtual address.
+ */
+int
+pci_map_bar(struct pci_device *dev, uint8_t barno, void **vap)
+{
+    /* TODO: STUB */
+    return 0;
+}
+
+void
+pci_msix_eoi(void)
+{
+    return;
+}
+
+/*
+ * Enable MSI-X for a device and allocate an
+ * interrupt vector.
+ *
+ * @dev: Device to enable MSI-X for.
+ * @intr: MSI-X interrupt descriptor.
+ */
+int
+pci_enable_msix(struct pci_device *dev, const struct msi_intr *intr)
+{
+    /* TODO: STUB */
+    return 0;
+}
diff --git a/sys/include/arch/aarch64/cpu.h b/sys/include/arch/aarch64/cpu.h
new file mode 100644
index 0000000..a6ccdec
--- /dev/null
+++ b/sys/include/arch/aarch64/cpu.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _MACHINE_CPU_H_
+#define _MACHINE_CPU_H_
+
+#include <sys/types.h>
+#include <sys/cdefs.h>
+#include <sys/proc.h>
+
+struct cpu_info {
+    struct proc *curtd;
+    struct cpu_info *self;
+};
+
+void cpu_startup(struct cpu_info *ci);
+void mp_bootstrap_aps(struct cpu_info *ci);
+struct cpu_info *this_cpu(void);
+
+extern struct cpu_info g_bsp_ci;
+
+#endif  /* !_MACHINE_CPU_H_ */
diff --git a/sys/include/arch/aarch64/frame.h b/sys/include/arch/aarch64/frame.h
new file mode 100644
index 0000000..ec11533
--- /dev/null
+++ b/sys/include/arch/aarch64/frame.h
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _MACHINE_FRAME_H_
+#define _MACHINE_FRAME_H_
+
+#include <sys/types.h>
+
+typedef uint64_t lreg_t;
+
+/* General purpose registers */
+struct gpregs {
+    lreg_t x0;
+    lreg_t x1;
+    lreg_t x2;
+    lreg_t x3;
+    lreg_t x4;
+    lreg_t x5;
+    lreg_t x6;
+    lreg_t x7;
+    lreg_t x8;
+    lreg_t x9;
+    lreg_t x10;
+    lreg_t x11;
+    lreg_t x12;
+    lreg_t x13;
+    lreg_t x14;
+    lreg_t x15;
+    lreg_t x16;
+    lreg_t x17;
+    lreg_t x18;
+    lreg_t x19;
+    lreg_t x20;
+    lreg_t x21;
+    lreg_t x22;
+    lreg_t x23;
+    lreg_t x24;
+    lreg_t x25;
+    lreg_t x26;
+    lreg_t x27;
+    lreg_t x28;
+    lreg_t x29;
+    lreg_t x30;
+};
+
+/* Stack regs */
+struct sregs {
+    lreg_t sp_el0;
+    lreg_t sp_el1;
+    lreg_t sp_el2;
+};
+
+/* Program status */
+struct pstat {
+    lreg_t spsr_el1;
+    lreg_t spsr_el2;
+    lreg_t spsr_el3;
+};
+
+struct trapframe {
+    struct gpregs gp;
+    struct sregs stack;
+    struct pstat status;
+    lreg_t elr_el1;
+    lreg_t elr_el2;
+    lreg_t elr_el3;
+    lreg_t pc;
+};
+
+#endif  /* !_MACHINE_FRAME_H_ */
diff --git a/sys/include/arch/aarch64/pcb.h b/sys/include/arch/aarch64/pcb.h
new file mode 100644
index 0000000..f9a0b1a
--- /dev/null
+++ b/sys/include/arch/aarch64/pcb.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _MACHINE_PCB_H_
+#define _MACHINE_PCB_H_
+
+#include <sys/types.h>
+#include <vm/pmap.h>
+
+struct pcb {
+    struct vas addrsp;
+};
+
+#endif  /* !_MACHINE_PCB_H_ */
diff --git a/sys/include/arch/aarch64/syscall.h b/sys/include/arch/aarch64/syscall.h
new file mode 100644
index 0000000..84a51e0
--- /dev/null
+++ b/sys/include/arch/aarch64/syscall.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _MACHINE_SYSCALL_H_
+#define _MACHINE_SYSCALL_H_
+
+#if !defined(__ASSEMBLER__)
+__always_inline static inline long
+syscall0(uint64_t code)
+{
+    return 0;
+}
+
+__always_inline static inline long
+syscall1(uint64_t code, uint64_t arg0)
+{
+    return 0;
+}
+
+__always_inline static long inline
+syscall2(uint64_t code, uint64_t arg0, uint64_t arg1)
+{
+    return 0;
+}
+
+__always_inline static inline long
+syscall3(uint64_t code, uint64_t arg0, uint64_t arg1, uint64_t arg2)
+{
+    return 0;
+}
+
+__always_inline static inline long
+syscall4(uint64_t code, uint64_t arg0, uint64_t arg1, uint64_t arg2, uint64_t arg3)
+{
+    return 0;
+}
+
+__always_inline static inline long
+syscall5(uint64_t code, uint64_t arg0, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4)
+{
+    return 0;
+}
+
+__always_inline static inline long
+syscall6(uint64_t code, uint64_t arg0, uint64_t arg1, uint64_t arg2, uint64_t arg3, uint64_t arg4, uint64_t arg5)
+{
+    return 0;
+}
+
+#define _SYSCALL_N(a0, a1, a2, a3, a4, a5, a6, name, ...) \
+    name
+
+#define syscall(...) \
+_SYSCALL_N(__VA_ARGS__, syscall6, syscall5, \
+            syscall4, syscall3, syscall2, syscall1, \
+            syscall0)(__VA_ARGS__)
+
+#endif  /* !__ASSEMBLER__ */
+#endif  /* !_MACHINE_SYSCALL_H_ */
diff --git a/sys/include/arch/aarch64/vas.h b/sys/include/arch/aarch64/vas.h
new file mode 100644
index 0000000..07cd576
--- /dev/null
+++ b/sys/include/arch/aarch64/vas.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _MACHINE_VAS_H_
+#define _MACHINE_VAS_H_
+
+#include <sys/types.h>
+#include <sys/spinlock.h>
+
+/*
+ * VAS structure - describes a virtual address space
+ */
+struct vas {
+    paddr_t ttbr0_el1;  /* Lower half */
+    paddr_t ttbr1_el1;  /* Higher half */
+    struct spinlock *lock;
+};
+
+#endif  /* !_MACHINE_VAS_H_ */