Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/arch/arm/mach-prima2/headsmp.S b/arch/arm/mach-prima2/headsmp.S
new file mode 100644
index 000000000..209d9fc5c
--- /dev/null
+++ b/arch/arm/mach-prima2/headsmp.S
@@ -0,0 +1,37 @@
+/*
+ * Entry of the second core for CSR Marco dual-core SMP SoCs
+ *
+ * Copyright (c) 2012 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+
+/*
+ * SIRFSOC specific entry point for secondary CPUs.  This provides
+ * a "holding pen" into which all secondary cores are held until we're
+ * ready for them to initialise.
+ */
+ENTRY(sirfsoc_secondary_startup)
+        mrc     p15, 0, r0, c0, c0, 5
+        and     r0, r0, #15
+        adr     r4, 1f
+        ldmia   r4, {r5, r6}
+        sub     r4, r4, r5
+        add     r6, r6, r4
+pen:    ldr     r7, [r6]
+        cmp     r7, r0
+        bne     pen
+
+        /*
+         * we've been released from the holding pen: secondary_stack
+         * should now contain the SVC stack for this core
+         */
+        b       secondary_startup
+ENDPROC(sirfsoc_secondary_startup)
+
+        .align
+1:      .long   .
+        .long   pen_release