path: root/cpu-supplement
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authorKinsey Moore <>2020-12-07 12:10:26 -0600
committerJoel Sherrill <>2020-12-11 17:16:01 -0600
commit9c407619c72bd97b19d96092d20dc48ce9bb0256 (patch)
tree915c16b592303582af9b7b021475d83034a84c22 /cpu-supplement
parentd716c79070901195912526c6e49d43defad00bdd (diff)
aarch64: Update interrupt details
Diffstat (limited to 'cpu-supplement')
1 files changed, 4 insertions, 1 deletions
diff --git a/cpu-supplement/aarch64.rst b/cpu-supplement/aarch64.rst
index 9e74d6b..a102817 100644
--- a/cpu-supplement/aarch64.rst
+++ b/cpu-supplement/aarch64.rst
@@ -104,7 +104,10 @@ Interrupt Stack
The board support package must initialize the interrupt stack. The memory for
-the stacks is usually reserved in the linker script.
+the stacks is usually reserved in the linker script. The interrupt stack pointer
+is stored in the EL0 stack pointer and is accessed by switching to SP0 mode
+at the beginning of interrupt calls and back to SPx mode after completion of
+interrupt calls using the `spsel` instruction.
Default Fatal Error Processing