From 24df4b958832cf7a42a82a205a536d8bcc02ab35 Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <kwojtus@protonmail.com>
Date: Tue, 17 Dec 2019 16:02:33 +0100
Subject: add forgotten libkernel.c

---
 libkernel.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 libkernel.c

(limited to 'libkernel.c')

diff --git a/libkernel.c b/libkernel.c
new file mode 100644
index 0000000..0955e0e
--- /dev/null
+++ b/libkernel.c
@@ -0,0 +1,12 @@
+// This is the privileged code, that gets placed somewhere in
+// unprivileged process' address space. It's compiled as relocatable,
+// so it can be loaded at different address for different processes.
+
+void call_unprivileged(void (*address) (void)) {
+  // switch to PL0
+  asm("cps #0b10000\n\r"
+      "isb" ::: "memory");
+
+  // jump to that unprivileged code
+  address();
+}
-- 
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<tr><td><span title='2020-01-17 14:22:08 +0100'>2020-01-17</span></td><td><a href='/guix/commit/tests/texlive.scm?id=6f918d69b4824226c877c0ca6385360a1dd38bbd'>import: texlive: Avoid uses of '@@' in tests.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>