Implement BootReason config

exosphere/src/bootconfig.c

@@ -8,6 +8,8 @@
 #include "fuse.h"
 #include "bootconfig.h"
 
+static boot_reason_t g_boot_reason = {0};
+
 bool bootconfig_matches_hardware_info(void) {
     uint32_t hardware_info[4];
     fuse_get_hardware_info(hardware_info);
@@ -107,3 +109,15 @@ uint64_t bootconfig_get_kernel_memory_configuration(void) {
         return 0ull;
     }
 }
+
+void bootconfig_load_boot_reason(volatile boot_reason_t *boot_reason) {
+    g_boot_reason = *boot_reason;
+}
+
+bool bootconfig_is_recovery_boot(void) {
+    return (g_boot_reason.is_recovery_boot != 0);
+}
+
+uint64_t bootconfig_get_boot_reason(void) {
+    return ((uint64_t)g_boot_reason.boot_reason_high << 24) | (g_boot_reason.boot_reason_low & 0xFFFFFF);
+}

exosphere/src/bootconfig.h

@@ -34,9 +34,19 @@ static inline bootconfig_t *get_loaded_bootconfig(void) {
     return (bootconfig_t *)(TZRAM_GET_SEGMENT_ADDRESS(TZRAM_SEGEMENT_ID_SECMON_EVT) + 0x180);
 }
 
+typedef struct {
+    uint64_t _0x00;
+    uint32_t _0x08;
+    uint32_t is_recovery_boot;
+    uint32_t boot_reason_low;
+    uint32_t boot_reason_high;
+} boot_reason_t;
+
 void bootconfig_load_and_verify(const bootconfig_t *bootconfig);
 void bootconfig_clear(void);
 
+void bootconfig_load_boot_reason(volatile boot_reason_t *boot_reason);
+
 /* Actual configuration getters. */
 bool bootconfig_is_package2_plaintext(void);
 bool bootconfig_is_package2_unsigned(void);
@@ -48,4 +58,7 @@ bool bootconfig_take_extabt_serror_to_el3(void);
 uint64_t bootconfig_get_memory_arrangement(void);
 uint64_t bootconfig_get_kernel_memory_configuration(void);
 
+bool bootconfig_is_recovery_boot(void);
+uint64_t bootconfig_get_boot_reason(void);
+
 #endif

exosphere/src/configitem.c

@@ -73,14 +73,13 @@ uint32_t configitem_get(ConfigItem item, uint64_t *p_outvalue) {
             *p_outvalue = fuse_get_retail_type();
             break;
         case CONFIGITEM_ISRECOVERYBOOT:
-            /* TODO: This requires reading values passed to crt0 via NX_Bootloader. TBD pending crt0 implementation. */
+            *p_outvalue = (int)(bootconfig_is_recovery_boot());
-            *p_outvalue = 0;
             break;
         case CONFIGITEM_DEVICEID:
             *p_outvalue = fuse_get_device_id();
             break;
         case CONFIGITEM_BOOTREASON:
-            /* TODO: This requires reading values passed to crt0 via NX_Bootloader. TBD pending crt0 implementation. */
+            *p_outvalue = bootconfig_get_boot_reason();
             break;
         case CONFIGITEM_MEMORYARRANGE:
             *p_outvalue = bootconfig_get_memory_arrangement();

exosphere/src/package2.c

@@ -364,7 +364,8 @@ void load_package2(coldboot_crt0_reloc_list_t *reloc_list) {
 
     setup_current_core_state();
 
-    /* TODO: Read and save BOOTREASON stored by NX_BOOTLOADER at 0x1F009FE00 */
+    /* Save boot reason to global. */
+    bootconfig_load_boot_reason((volatile boot_reason_t *)(MAILBOX_NX_BOOTLOADER_BOOT_REASON));
     
     /* Initialize cache'd random bytes for kernel. */
     randomcache_init();

exosphere/src/package2.h

@@ -31,6 +31,8 @@ static inline uintptr_t get_nx_bootloader_mailbox_base(void) {
 /* Physaddr 0x40002EFC */
 #define MAILBOX_NX_BOOTLOADER_IS_SECMON_AWAKE MAKE_REG32(MAILBOX_NX_BOOTLOADER_BASE + 0xEFCULL)
 
+#define MAILBOX_NX_BOOTLOADER_BOOT_REASON (MAILBOX_NX_BOOTLOADER_BASE + 0xE10ULL)
+
 #define NX_BOOTLOADER_BOOTCONFIG_POINTER ((void *)(0x4003D000ull))
 
 #define NX_BOOTLOADER_PACKAGE2_LOAD_ADDRESS ((void *)(0xA9800000ull))