From 8466e9b4d2fbca85d53d8dadc87914b4766c43de Mon Sep 17 00:00:00 2001 From: wires Date: Wed, 19 Mar 2025 17:09:41 -0400 Subject: initial commit --- src/startup.s | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 src/startup.s (limited to 'src/startup.s') diff --git a/src/startup.s b/src/startup.s new file mode 100644 index 0000000..e0c6385 --- /dev/null +++ b/src/startup.s @@ -0,0 +1,28 @@ +.section ".init" +.global _start + +_start: + mrs x1, MPIDR_EL1 + and x1, x1, 0b11 + + cbz x1, init +halt: + wfe + b halt + +init: + adr x1, __stack_base + mov sp, x1 + + adr x1, __bss_start + adr x2, __bss_size + cbz x2, exec_kernel + +clear_bss: + str xzr, [x1], 8 + sub x2, x2, 1 + cbnz w2, clear_bss + +exec_kernel: + bl main + b halt -- cgit 1.4.1