arm: sevl_wfe.S example

2026-01-23 02:05:57 +01:00 · 2020-01-14 00:00:00 +00:00
parent cc1d34f862
commit 270421ccc3
2 changed files with 15 additions and 0 deletions
--- a/userland/arch/aarch64/freestanding/linux/sevl_wfe.S
+++ b/userland/arch/aarch64/freestanding/linux/sevl_wfe.S
@@ -0,0 +1,14 @@
+/* https://cirosantilli.com/linux-kernel-module-cheat#arm-wfe-and-sev-instructions */
+
+.text
+.global _start
+_start:
+asm_main_after_prologue:
+    sevl
+    /* Shoul not sleep due to above sevl. */
+    wfe
+
+    /* exit */
+    mov x0, 0     /* exit status */
+    mov x8, 93    /* syscall number */
+    svc 0