arm64: secmon: add entry point for turned on CPUs

Newly turned on CPUs need a place to go bring its EL3
state inline with expectations. Plumb this path in for
CPUs turning on as well as waking up from a power down
state. Some of the infrastructure declarations were
moved around for easier consumption in ramstage and
secmon. Lastly, a psci_soc_init() is added to
inform the SoC of the CPU's entry point as well do
any initialization.

BUG=chrome-os-partner:32112
BRANCH=None
TEST=Built and booted. On entry point not actually utilized.

Change-Id: I2af424c2906df159f78ed5e0a26a6bc0ba2ba24f
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: dbefec678a111e8b42acf2ae162c1ccdd7f9fd40
Original-Change-Id: I7b8c8c828ffb73752ca3ac1117cd895a5aa275d8
Original-Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/228296
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/9422
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)

1 files changed, 22 insertions, 0 deletions

diff --git a/src/arch/arm64/include/armv8/arch/cpu.h b/src/arch/arm64/include/armv8/arch/cpu.h
index c6ca7d38c6..d968a06fe4 100644
--- a/src/arch/arm64/include/armv8/arch/cpu.h
+++ b/src/arch/arm64/include/armv8/arch/cpu.h
@@ -148,4 +148,26 @@ void arch_cpu_wait_for_action(void);
  */
 unsigned int smp_processor_id(void);
 
+/*
+ * Stages and rmodules have 2 entry points: BSP and non-BSP. Provided
+ * a pointer the correct non-BSP entry point will be returned. The
+ * first instruction is for BSP and the 2nd is for non-BSP. Instructions
+ * are all 32-bit on arm64.
+ */
+static inline void *secondary_entry_point(void *e)
+{
+	uintptr_t nonbsp = (uintptr_t)e;
+
+	return (void *)(nonbsp + sizeof(uint32_t));
+}
+
+/*
+ * The arm64_cpu_startup() initializes a CPU's exception stack and regular
+ * stack as well initializing the C environment for the processor. It
+ * calls into the array of function pointers at symbol c_entry depending
+ * on BSP state. Note that arm64_cpu_startup contains secondary entry
+ * point which can be obtained by secondary_entry_point().
+ */
+void arm64_cpu_startup(void);
+
 #endif /* __ARCH_CPU_H__ */