esp_system: restore order of some init functions

components/esp_system/include/esp_private/startup_internal.h

@@ -0,0 +1,70 @@
+// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include "esp_attr.h"
+
+#include "soc/soc_caps.h"
+#include "hal/cpu_hal.h"
+
+#include "sdkconfig.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern bool g_spiram_ok; // [refactor-todo] better way to communicate this from port layer to common startup code
+
+// Port layer defines the entry point. It then transfer control to a `sys_startup_fn_t`, stored in this
+// array, one per core.
+typedef void (*sys_startup_fn_t)(void);
+
+#if !CONFIG_ESP_SYSTEM_SINGLE_CORE_MODE
+extern sys_startup_fn_t g_startup_fn[SOC_CPU_CORES_NUM];
+#else
+extern sys_startup_fn_t g_startup_fn[1];
+#endif
+
+// Utility to execute `sys_startup_fn_t` for the current core.
+#define SYS_STARTUP_FN()  ((*g_startup_fn[(cpu_hal_get_core_id())])())
+
+#if !CONFIG_ESP_SYSTEM_SINGLE_CORE_MODE
+void startup_resume_other_cores(void);
+#endif
+
+typedef struct {
+  void (*fn)(void);
+  uint32_t cores;
+} esp_system_init_fn_t;
+
+/*
+ * Declare an component initialization function that will execute on the specified cores (ex. if BIT0 == 1, will execute
+ * on CORE0, CORE1 if BIT1 and so on).
+ * 
+ * @note Initialization functions should be placed in a compilation unit where at least one other
+ * symbol is referenced 'meaningfully' in another compilation unit, otherwise this gets discarded during linking. (By
+ * 'meaningfully' we mean the reference should not itself get optimized out by the compiler/discarded by the linker).
+ */
+#define ESP_SYSTEM_INIT_FN(f, c, ...) \
+static void  __attribute__((used)) __VA_ARGS__ __esp_system_init_fn_##f(void); \
+static __attribute__((used)) esp_system_init_fn_t _SECTION_ATTR_IMPL(".esp_system_init_fn", f) \
+                    esp_system_init_fn_##f = { .fn = ( __esp_system_init_fn_##f), .cores = (c) }; \
+static __attribute__((used)) __VA_ARGS__ void __esp_system_init_fn_##f(void) // [refactor-todo] this can be made public API if we allow components to declare init functions, 
+                                                                             // instead of calling them explicitly
+
+#ifdef __cplusplus
+}
+#endif
+