Integrate 5.x SMC API changes, add 4.x specific setup, implement target firmware selection

exosphere/src/exocfg.h

@@ -0,0 +1,41 @@
+#ifndef EXOSPHERE_EXOSPHERE_CONFIG_H
+#define EXOSPHERE_EXOSPHERE_CONFIG_H
+
+#include <stdint.h>
+#include "utils.h"
+
+#include "memory_map.h"
+
+/* This serves to set configuration for *exosphere itself*, separate from the SecMon Exosphere mimics. */
+
+/* "AMS0" */
+#define MAGIC_ATMOSPHERE (0x30534D41)
+
+#define EXOSPHERE_TARGET_FIRMWARE_100 1
+#define EXOSPHERE_TARGET_FIRMWARE_200 2
+#define EXOSPHERE_TARGET_FIRMWARE_300 3
+#define EXOSPHERE_TARGET_FIRMWARE_400 4
+#define EXOSPHERE_TARGET_FIRMWARE_500 5
+
+/* TODO: What should this be, for release? */
+#define EXOSPHERE_TARGET_FIRMWARE_DEFAULT_FOR_DEBUG EXOSPHERE_TARGET_FIRMWARE_200
+
+#define MAILBOX_BASE_PHYS  (MMIO_GET_DEVICE_PA(MMIO_DEVID_NXBOOTLOADER_MAILBOX))
+
+/* TODO: Should this be at a non-static location? */
+#define MAILBOX_EXOSPHERE_CONFIG_PHYS (*((volatile exosphere_config_t *)(MAILBOX_BASE_PHYS + 0xE40ULL)))
+
+
+typedef struct {
+    unsigned int magic;
+    unsigned int target_firmware;
+} exosphere_config_t;
+
+unsigned int exosphere_load_config(void);
+unsigned int exosphere_get_target_firmware(void);
+
+static inline unsigned int exosphere_get_target_firmware_physical(void) {
+    return MAILBOX_EXOSPHERE_CONFIG_PHYS.magic == MAGIC_ATMOSPHERE ? MAILBOX_EXOSPHERE_CONFIG_PHYS.target_firmware : EXOSPHERE_TARGET_FIRMWARE_DEFAULT_FOR_DEBUG;
+}
+
+#endif