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diff --git a/openpower.mdwn b/openpower.mdwn
index 200d924c344f9122f70e4d593f96bc0bc16107df..e1f717826c39c3b2b1092dd2e765c084ec528bab 100644 (file)
--- a/openpower.mdwn
+++ b/openpower.mdwn
@@ -70,3 +70,12 @@ If certain alternative configs are expected, they are part of the function ABI w
 
 All of this is a software issue (compiler / ABI).
 
+# RISCV userspace
+
+Dual ISA, RV userspace only. Requires PowerISA to be able to context-switch RV registers and CSRs.
+
+the exception entry point:
+https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/powerpc/kernel/exceptions-64s.S?h=v5.4-rc5#n409
+
+the rest of the context switch code is in a different file:
+https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/powerpc/kernel/entry_64.S?h=v5.4-rc5#n589