PRODINFO: Revamp blanking/write disallow policy. (#913)

* exo/fusee: hookup new prodinfo settings

* fusee: new scheme doesn't need FLAGS_DEFAULT

* fusee: fix c/p errors

* ams.mitm: completely revamp prodinfo backup mechanism

* ams.mitm: Implement revamped blanking/write policy

* strat: make early boot more debuggable

* exo: condense flag logic

exosphere/src/configitem.c

@@ -290,7 +290,15 @@ uint32_t configitem_get(bool privileged, ConfigItem item, uint64_t *p_outvalue)
             break;
         case CONFIGITEM_HAS_RCM_BUG_PATCH:
             /* UNOFFICIAL: Gets whether this unit has the RCM bug patched. */
-            *p_outvalue = (int)(fuse_has_rcm_bug_patch());;
+            *p_outvalue = (int)(fuse_has_rcm_bug_patch());
+            break;
+        case CONFIGITEM_SHOULD_BLANK_PRODINFO:
+            /* UNOFFICIAL: Gets whether this unit should simulate a "blanked" PRODINFO. */
+            *p_outvalue = exosphere_should_blank_prodinfo();
+            break;
+        case CONFIGITEM_ALLOW_CAL_WRITES:
+            /* UNOFFICIAL: Gets whether this unit should allow writing to the calibration partition. */
+            *p_outvalue = exosphere_should_allow_writing_to_cal();
             break;
         default:
             result = 2;

exosphere/src/configitem.h

@@ -45,6 +45,8 @@ typedef enum {
     CONFIGITEM_NEEDS_SHUTDOWN = 65002,
     CONFIGITEM_EXOSPHERE_VERHASH = 65003,
     CONFIGITEM_HAS_RCM_BUG_PATCH = 65004,
+    CONFIGITEM_SHOULD_BLANK_PRODINFO = 65005,
+    CONFIGITEM_ALLOW_CAL_WRITES = 65006,
 } ConfigItem;
 
 #define REBOOT_KIND_NO_REBOOT     0

exosphere/src/exocfg.c

@@ -27,6 +27,9 @@ static bool g_has_loaded_config = false;
 
 #define EXOSPHERE_CHECK_FLAG(flag) ((g_exosphere_cfg.flags & flag) != 0)
 
+static unsigned int exosphere_is_emummc() {
+    return g_exosphere_cfg.emummc_cfg.base_cfg.magic == MAGIC_EMUMMC_CONFIG && g_exosphere_cfg.emummc_cfg.base_cfg.type != EMUMMC_TYPE_NONE;
+}
 
 /* Read config out of IRAM, return target firmware version. */
 unsigned int exosphere_load_config(void) {
@@ -92,6 +95,26 @@ unsigned int exosphere_should_enable_usermode_pmu_access(void) {
     return EXOSPHERE_CHECK_FLAG(EXOSPHERE_FLAG_ENABLE_USERMODE_PMU_ACCESS);
 }
 
+unsigned int exosphere_should_blank_prodinfo(void) {
+    if (!g_has_loaded_config) {
+        generic_panic();
+    }
+
+    return EXOSPHERE_CHECK_FLAG(EXOSPHERE_FLAG_BLANK_PRODINFO);
+}
+
+unsigned int exosphere_should_allow_writing_to_cal(void) {
+    if (!g_has_loaded_config) {
+        generic_panic();
+    }
+
+    if (exosphere_is_emummc()) {
+        return 1;
+    } else {
+        return EXOSPHERE_CHECK_FLAG(EXOSPHERE_FLAG_ALLOW_WRITING_TO_CAL_SYSMMC);
+    }
+}
+
 const exo_emummc_config_t *exosphere_get_emummc_config(void) {
     if (!g_has_loaded_config) {
         generic_panic();

exosphere/src/exocfg.h

@@ -41,6 +41,8 @@
 #define EXOSPHERE_FLAG_IS_DEBUGMODE_USER                    (1 << 2u)
 #define EXOSPHERE_FLAG_DISABLE_USERMODE_EXCEPTION_HANDLERS  (1 << 3u)
 #define EXOSPHERE_FLAG_ENABLE_USERMODE_PMU_ACCESS           (1 << 4u)
+#define EXOSPHERE_FLAG_BLANK_PRODINFO                       (1 << 5u)
+#define EXOSPHERE_FLAG_ALLOW_WRITING_TO_CAL_SYSMMC          (1 << 6u)
 #define EXOSPHERE_FLAGS_DEFAULT (EXOSPHERE_FLAG_IS_DEBUGMODE_PRIV)
 
 typedef struct {
@@ -60,6 +62,8 @@ unsigned int exosphere_should_override_debugmode_priv(void);
 unsigned int exosphere_should_override_debugmode_user(void);
 unsigned int exosphere_should_disable_usermode_exception_handlers(void);
 unsigned int exosphere_should_enable_usermode_pmu_access(void);
+unsigned int exosphere_should_blank_prodinfo(void);
+unsigned int exosphere_should_allow_writing_to_cal(void);
 
 const exo_emummc_config_t *exosphere_get_emummc_config(void);