From 753666a333bb9ff0b8410cd729b9d06df85e0013 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Wed, 2 Apr 2025 09:38:22 -0400
Subject: kernel/aarch64: Add initial AARCH64 port

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/arch/aarch64/conf/link.ld | 75 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 sys/arch/aarch64/conf/link.ld

(limited to 'sys/arch/aarch64/conf/link.ld')

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.*)
+    }
+}
-- 
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