Implement Panic() stub.

exosphere/src/pmc.h

@@ -19,6 +19,8 @@ static inline uintptr_t get_pmc_base(void) {
 
 #define APBDEV_PMC_SCRATCH0_0 (*((volatile uint32_t *)(PMC_BASE + 0x50)))
 
+#define APBDEV_PMC_CRYPTO_OP_0 (*((volatile uint32_t *)(PMC_BASE + 0xF4)))
+
 #define APBDEV_PM_0 (*((volatile uint32_t *)(PMC_BASE + 0x14)))
 #define APBDEV_PMC_WAKE2_STATUS_0 (*((volatile uint32_t *)(PMC_BASE + 0x168)))
 #define APBDEV_PMC_CNTRL2_0 (*((volatile uint32_t *)(PMC_BASE + 0x440)))
@@ -30,5 +32,8 @@ static inline uintptr_t get_pmc_base(void) {
 #define APBDEV_PMC_SECURE_SCRATCH114_0 (*((volatile uint32_t *)(PMC_BASE + 0xB20)))
 #define APBDEV_PMC_SECURE_SCRATCH115_0 (*((volatile uint32_t *)(PMC_BASE + 0xB24)))
 
+#define APBDEV_PMC_SCRATCH200_0 (*((volatile uint32_t *)(PMC_BASE + 0x840)))
+
+
 
 #endif

exosphere/src/smc_api.c

@@ -566,7 +566,7 @@ uint32_t smc_configure_carveout(smc_args_t *args) {
 }
 
 uint32_t smc_panic(smc_args_t *args) {
-    (void)args;
-    return 0;
-    /* TODO */
+    /* Swap RGB values from args. */
+    uint32_t color = ((args->X[1] & 0xF) << 8) | ((args->X[1] & 0xF0)) | ((args->X[1] & 0xF00) >> 8);
+    panic((color << 20) | 0x40);
 }

exosphere/src/timers.c

@@ -1,3 +1,7 @@
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "utils.h"
 #include "timers.h"
 
 void wait(uint32_t microseconds) {
@@ -6,3 +10,16 @@ void wait(uint32_t microseconds) {
         /* Spin-lock. */
     }
 }
+
+__attribute__ ((noreturn)) void watchdog_reboot(void) {
+    unsigned int current_core = get_core_id();
+    volatile watchdog_timers_t *wdt = GET_WDT(current_core);
+    wdt->PATTERN = WDT_REBOOT_PATTERN;
+    wdt->COMMAND = 2; /* Disable Counter. */
+    GET_WDT_REBOOT_CFG_REG(current_core) = 0xC0000000;
+    wdt->CONFIG = 0x8015 + current_core; /* Full System Reset after Fourth Counter expires, using TIMER(5+core_id). */
+    wdt->COMMAND = 1; /* Enable Counter. */
+    while (true) {
+        /* Wait for reboot. */
+    }
+}

exosphere/src/timers.h

@@ -14,10 +14,23 @@ static inline uintptr_t get_timers_base(void) {
 
 #define TIMERUS_CNTR_1US_0 (*((volatile uint32_t *)(TIMERS_BASE + 0x10)))
 
+typedef struct {
+    uint32_t CONFIG;
+    uint32_t STATUS;
+    uint32_t COMMAND;
+    uint32_t PATTERN;
+} watchdog_timers_t;
+
+#define GET_WDT(n) ((volatile watchdog_timers_t *)(TIMERS_BASE + 0x100 + 0x20 * n))
+#define WDT_REBOOT_PATTERN 0xC45A
+#define GET_WDT_REBOOT_CFG_REG(n) (*((volatile uint32_t *)(TIMERS_BASE + 0x60 + 0x8*n)))
+
 void wait(uint32_t microseconds);
 
 static inline uint32_t get_time(void) {
     return TIMERUS_CNTR_1US_0;
 }
 
+__attribute__ ((noreturn)) void watchdog_reboot(void);
+
 #endif

exosphere/src/utils.c

@@ -1,11 +1,26 @@
+#include <stdbool.h>
 #include "utils.h"
+#include "se.h"
+#include "fuse.h"
+#include "pmc.h"
+#include "timers.h"
 
-void panic(uint32_t code) {
-    (void)code; /* TODO */
+
+__attribute__ ((noreturn)) void panic(uint32_t code) {
+    /* Set Panic Code for NX_BOOTLOADER. */
+    if (APBDEV_PMC_SCRATCH200_0 == 0) {
+        APBDEV_PMC_SCRATCH200_0 = code;
     }
     
-void generic_panic(void) {
-    /* TODO */
+    /* TODO: Custom Panic Driver, which displays to screen without rebooting. */
+    /* For now, just use NX BOOTLOADER's panic. */
+    fuse_disable_programming();
+    APBDEV_PMC_CRYPTO_OP_0 = 1; /* Disable all SE operations. */
+    watchdog_reboot();
+}
+
+__attribute__ ((noreturn)) void generic_panic(void) {
+    panic(0xFF000006);
 }
 
 __attribute__((noinline)) bool overlaps(uint64_t as, uint64_t ae, uint64_t bs, uint64_t be)

exosphere/src/utils.h

@@ -13,8 +13,8 @@
 
 #define ALINLINE        __attribute__((always_inline))
 
-void panic(uint32_t code);
-void generic_panic(void);
+__attribute__ ((noreturn)) void panic(uint32_t code);
+__attribute__ ((noreturn)) void generic_panic(void);
 bool overlaps(uint64_t as, uint64_t ae, uint64_t bs, uint64_t be);
 
 static inline uintptr_t get_physical_address(const void *vaddr) {