perf(cpus): inline the reset function
Similar to the cpu_rev_var and cpu_ger_rev_var functions, inline the
call_reset_handler handler. This way we skip the costly branch at no
extra cost as this is the only place where this is called.
While we're at it, drop the options for CPU_NO_RESET_FUNC. The only cpus
that need that are virtual cpus which can spare the tiny bit of
performance lost. The rest are real cores which can save on the check
for zero.
Now is a good time to put the assert for a missing cpu in the
get_cpu_ops_ptr function so that it's a bit better encapsulated.
Change-Id: Ia7c3dcd13b75e5d7c8bafad4698994ea65f42406
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
diff --git a/lib/cpus/aarch64/cpu_helpers.S b/lib/cpus/aarch64/cpu_helpers.S
index ead91c3..e608422 100644
--- a/lib/cpus/aarch64/cpu_helpers.S
+++ b/lib/cpus/aarch64/cpu_helpers.S
@@ -14,47 +14,6 @@
#include <lib/cpus/errata.h>
#include <lib/el3_runtime/cpu_data.h>
- /* Reset fn is needed in BL at reset vector */
-#if defined(IMAGE_BL1) || defined(IMAGE_BL31) || \
- (defined(IMAGE_BL2) && RESET_TO_BL2)
- /*
- * The reset handler common to all platforms. After a matching
- * cpu_ops structure entry is found, the correponding reset_handler
- * in the cpu_ops is invoked.
- * Clobbers: x0 - x19, x30
- */
- .globl reset_handler
-func reset_handler
- mov x19, x30
-
- /* The plat_reset_handler can clobber x0 - x18, x30 */
- bl plat_reset_handler
-
- /* Get the matching cpu_ops pointer */
- bl get_cpu_ops_ptr
-
-#if ENABLE_ASSERTIONS
- /*
- * Assert if invalid cpu_ops obtained. If this is not valid, it may
- * suggest that the proper CPU file hasn't been included.
- */
- cmp x0, #0
- ASM_ASSERT(ne)
-#endif
-
- /* Get the cpu_ops reset handler */
- ldr x2, [x0, #CPU_RESET_FUNC]
- mov x30, x19
- cbz x2, 1f
-
- /* The cpu_ops reset handler can clobber x0 - x19, x30 */
- br x2
-1:
- ret
-endfunc reset_handler
-
-#endif
-
#ifdef IMAGE_BL31 /* The power down core and cluster is needed only in BL31 */
/*
* void prepare_cpu_pwr_dwn(unsigned int power_level)
@@ -213,6 +172,14 @@
b 1b
error_exit:
#endif
+#if ENABLE_ASSERTIONS
+ /*
+ * Assert if invalid cpu_ops obtained. If this is not valid, it may
+ * suggest that the proper CPU file hasn't been included.
+ */
+ cmp x0, #0
+ ASM_ASSERT(ne)
+#endif
ret
endfunc get_cpu_ops_ptr