1 files changed, 46 insertions, 0 deletions
diff --git a/kernel/arch/aarch64/entry.S b/kernel/arch/aarch64/entry.S
new file mode 100644
index 0000000..1ca9b0c
--- /dev/null
+++ b/kernel/arch/aarch64/entry.S
@@ -0,0 +1,46 @@
+// ============================================================================
+// arch/aarch64/entry.S - Kernel entry point (AArch64)
+//
+// Called by the UEFI loader after ExitBootServices.
+//   - EL1, MMU on (identity map from UEFI)
+//   - X0 = pointer to BootInfo structure (AAPCS64 6.8.2 C.9 Pointer located in X[NGRN])
+//   - Interrupts masked (DAIF)
+// ============================================================================
+
+.section .text
+.global _start
+.extern kernel_main
+
+_start:
+    // Mask all interrupts
+    msr     daifset, #0xF
+
+    // Set up kernel stack pointer to Stack Pointer(SP)
+    adrp    x1, _stack_top
+    add     x1, x1, :lo12:_stack_top
+    mov     sp, x1
+
+    // Clear frame pointer for clean stack traces
+    // x29 is Frame Pointer (FP), points to the prev stack frame. Make kerne_main is root of the call chain (remove UEFI calls)
+    // x30 is Link Register (LR), holds the return address from the last bl. Same logic.
+    mov     x29, #0
+    mov     x30, #0
+
+    // X0 already holds BootInfo*
+    bl      kernel_main
+
+    // Should never return
+.Lhalt:
+    wfi
+    b       .Lhalt
+
+// ============================================================================
+// Kernel stack (16 KiB)
+// Maybe in future i will increase this value, but i hope it's not necessary
+// ============================================================================
+
+.section .bss
+.balign 4096
+_stack_bottom:
+    .space CONFIG_KERNEL_STACK_SIZE
+_stack_top: