Merge tag 'f2fs-for-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk...

[sfrench/cifs-2.6.git] / Documentation / arm64 / booting.txt

diff --git a/Documentation/arm64/booting.txt b/Documentation/arm64/booting.txt
index 8d0df62c3fe025fa963e0add0e25a33be43898e2..8df9f4658d6f9b27a2c7643dfc3ddd14de28de3f 100644 (file)
--- a/Documentation/arm64/booting.txt
+++ b/Documentation/arm64/booting.txt
@@ -205,6 +205,14 @@ Before jumping into the kernel, the following conditions must be met:
     ICC_SRE_EL2.SRE (bit 0) must be initialised to 0b0.
   - The DT or ACPI tables must describe a GICv2 interrupt controller.
 
+  For CPUs with pointer authentication functionality:
+  - If EL3 is present:
+    SCR_EL3.APK (bit 16) must be initialised to 0b1
+    SCR_EL3.API (bit 17) must be initialised to 0b1
+  - If the kernel is entered at EL1:
+    HCR_EL2.APK (bit 40) must be initialised to 0b1
+    HCR_EL2.API (bit 41) must be initialised to 0b1
+
 The requirements described above for CPU mode, caches, MMUs, architected
 timers, coherency and system registers apply to all CPUs.  All CPUs must
 enter the kernel in the same exception level.