Add PSP/GameCube/Wii save-device availability checks

PSP checks memory-stick reachability via sceIoGetstat. GameCube gets two
devices (CARD_SLOTA/CARD_SLOTB), each mounted via CARD_Init/CARD_Mount and
checked for free space via CARD_GetDirectory/CARD_GetBlockCount. Wii picks
between three storage methods at compile time (DUSK_SAVE_WII_METHOD =
NAND/CARD/SD in wii.cmake, default NAND via ISFS) since real hardware
behavior for the default is unverified.

Also fixes two pre-existing bugs found while build/runtime-testing this
across PPSSPP and Dolphin: wrong libogc language macros in
systemGetLocaleDolphin, and a missing SYS_STDIO_Report(true) call that
silently swallowed all guest console output in Dolphin.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

cmake/targets/wii.cmake

@@ -4,6 +4,17 @@ target_compile_definitions(${DUSK_LIBRARY_TARGET_NAME} PUBLIC
   DUSK_WII
 )
 
+# Wii save storage method - see src/duskdolphin/save/savedeviceplatform.h.
+set(DUSK_SAVE_WII_METHOD "NAND" CACHE STRING
+  "Wii save storage: NAND (internal storage via ISFS), CARD (GameCube-\
+compatible memory card emulation), or SD (SD card via libfat)"
+)
+set_property(CACHE DUSK_SAVE_WII_METHOD PROPERTY STRINGS "NAND" "CARD" "SD")
+
+target_compile_definitions(${DUSK_LIBRARY_TARGET_NAME} PUBLIC
+  DUSK_SAVE_WII_METHOD_${DUSK_SAVE_WII_METHOD}
+)
+
 # Generate Homebrew Channel meta.xml from project identity variables
 string(TIMESTAMP DUSK_BUILD_DATE "%Y%m%d000000" UTC)
 configure_file(

src/duskdolphin/CMakeLists.txt

@@ -22,5 +22,6 @@ add_subdirectory(input)
 if(DUSK_NETWORK)
   add_subdirectory(network)
 endif()
+add_subdirectory(save)
 add_subdirectory(system)
 add_subdirectory(time)

src/duskdolphin/save/CMakeLists.txt

@@ -0,0 +1,26 @@
+# Copyright (c) 2026 Dominic Masters
+#
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+# Only one save device implementation is ever compiled in - it must match
+# whichever one savedeviceplatform.h dispatches to. In particular, the NAND
+# (ISFS) device can't even compile on GameCube - libogc's isfs.h declares
+# nothing at all outside of Wii (HW_RVL) builds.
+if(DUSK_TARGET_SYSTEM STREQUAL "wii" AND DUSK_SAVE_WII_METHOD STREQUAL "NAND")
+  target_sources(${DUSK_LIBRARY_TARGET_NAME}
+    PUBLIC
+      savedevicedolphinnand.c
+  )
+elseif(DUSK_TARGET_SYSTEM STREQUAL "wii" AND DUSK_SAVE_WII_METHOD STREQUAL "SD")
+  target_sources(${DUSK_LIBRARY_TARGET_NAME}
+    PUBLIC
+      savedevicedolphinsd.c
+  )
+else()
+  # GameCube, or Wii with DUSK_SAVE_WII_METHOD=CARD.
+  target_sources(${DUSK_LIBRARY_TARGET_NAME}
+    PUBLIC
+      savedevicedolphincard.c
+  )
+endif()

src/duskdolphin/save/savedevicedolphincard.c

@@ -0,0 +1,122 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "save/savedevice.h"
+#include "save/savedevicedolphincard.h"
+#include "save/savemanager.h"
+#include "assert/assert.h"
+
+errorret_t saveDeviceDolphinCardInit(savedevice_t *device) {
+  assertNotNull(device, "device cannot be null");
+
+  device->state = SAVE_DEVICE_STATE_UNKNOWN;
+
+  // Each savedevice_t in SAVE_MANAGER.devices maps to one physical memory
+  // card slot - device 0 is slot A, device 1 is slot B, determined by this
+  // device's position in that array (the same index math savemanager.c
+  // itself uses to identify a device).
+  uint8_t index = (uint8_t)(device - &SAVE_MANAGER.devices[0]);
+  device->platform.channel = index == 0 ? CARD_SLOTA : CARD_SLOTB;
+
+  errorOk();
+}
+
+errorret_t saveDeviceDolphinCardUpdate(savedevice_t *device) {
+  assertNotNull(device, "device cannot be null");
+  assertIsMainThread("Invalid thread");
+  errorOk();
+}
+
+void saveDeviceDolphinCardCheckAvailability(savedevice_t *device) {
+  assertNotNull(device, "device cannot be null");
+  assertIsMainThread("Invalid thread");
+  assertTrue(
+    device->state == SAVE_DEVICE_STATE_CHECKING_AVAILABILITY,
+    "Device state incorrect?"
+  );
+
+  savedeviceplatform_t *platform = &device->platform;
+
+  // CARD_Init sets up card_inited, the per-channel control blocks (wait
+  // queues, alarms) CARD_Mount reads, and initializes the DSP (needed for
+  // the card unlock sequence) - safe to call more than once, and cheap
+  // enough to just always call before every mount attempt.
+  int32_t result = CARD_Init(SAVE_DEVICE_DOLPHIN_GAME_CODE, NULL);
+  if(result < 0) {
+    device->state = SAVE_DEVICE_STATE_UNAVAILABLE;
+    device->reasonKey = "save.dolphin.card_init_failed";
+    return saveDeviceFireCallback(device);
+  }
+
+  do {
+    result = CARD_Mount(platform->channel, platform->cardBuffer, NULL);
+  } while(result == CARD_ERROR_BUSY);
+
+  if(result < 0) {
+    platform->mounted = false;
+    device->state = SAVE_DEVICE_STATE_UNAVAILABLE;
+    switch(result) {
+      case CARD_ERROR_NOCARD:
+        device->reasonKey = "save.dolphin.no_card";
+        break;
+      case CARD_ERROR_WRONGDEVICE:
+        device->reasonKey = "save.dolphin.wrong_device";
+        break;
+      case CARD_ERROR_BROKEN:
+        device->reasonKey = "save.dolphin.broken";
+        break;
+      default:
+        device->reasonKey = "save.dolphin.mount_failed";
+        break;
+    }
+    return saveDeviceFireCallback(device);
+  }
+  platform->mounted = true;
+
+  if(!saveDeviceDolphinCardHasFreeSpace(platform->channel)) {
+    device->state = SAVE_DEVICE_STATE_UNAVAILABLE;
+    device->reasonKey = "save.dolphin.card_full";
+    return saveDeviceFireCallback(device);
+  }
+
+  device->state = SAVE_DEVICE_STATE_AVAILABLE;
+  device->reasonKey = NULL;
+  saveDeviceFireCallback(device);
+}
+
+bool_t saveDeviceDolphinCardHasFreeSpace(const int32_t channel) {
+  uint16_t blockCount = 0;
+  if(CARD_GetBlockCount(channel, &blockCount) < 0) return false;
+
+  uint32_t sectorSize = 0;
+  if(CARD_GetSectorSize(channel, &sectorSize) < 0 || sectorSize == 0) {
+    return false;
+  }
+
+  // showall=true - free space is a card-wide resource, not just what this
+  // game itself has already written.
+  card_dir entries[CARD_MAXFILES];
+  int32_t count = 0;
+  if(CARD_GetDirectory(channel, entries, &count, true) < 0) return false;
+  if(count >= CARD_MAXFILES) return false;// No free file entry left either.
+
+  uint32_t usedBlocks = 0;
+  for(int32_t i = 0; i < count; i++) {
+    usedBlocks += (entries[i].filelen + sectorSize - 1) / sectorSize;
+  }
+
+  return usedBlocks < (uint32_t)blockCount;
+}
+
+errorret_t saveDeviceDolphinCardDispose(savedevice_t *device) {
+  assertNotNull(device, "device cannot be null");
+  if(device->platform.mounted) {
+    CARD_Unmount(device->platform.channel);
+    device->platform.mounted = false;
+  }
+  errorOk();
+}

src/duskdolphin/save/savedevicedolphincard.h

@@ -0,0 +1,75 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "error/error.h"
+#include <gccore.h>
+
+// GameCube always uses this device (slot A + slot B). On Wii it's also used
+// when DUSK_SAVE_WII_METHOD_CARD is selected - libogc's CARD API
+// transparently redirects to Wii's NAND-based GameCube memory card
+// emulation, so the exact same code path works on both.
+#ifndef SAVE_DEVICE_DOLPHIN_GAME_CODE
+  #define SAVE_DEVICE_DOLPHIN_GAME_CODE "DUSK"
+#endif
+
+typedef struct {
+  // Set from this device's index into SAVE_MANAGER.devices - device 0 is
+  // CARD_SLOTA, device 1 is CARD_SLOTB.
+  int32_t channel;
+  uint8_t cardBuffer[CARD_WORKAREA] __attribute__((aligned(32)));
+  bool_t mounted;
+} savedeviceplatform_t;
+
+typedef struct savedevice_s savedevice_t;
+
+/**
+ * Initializes the save device platform.
+ *
+ * @param device The save device platform to initialize.
+ * @return Error state if any.
+ */
+errorret_t saveDeviceDolphinCardInit(savedevice_t *device);
+
+/**
+ * Updates the save device platform.
+ *
+ * @param device The save device platform to update.
+ * @return Error state if any.
+ */
+errorret_t saveDeviceDolphinCardUpdate(savedevice_t *device);
+
+/**
+ * Requests the device to check its availability, this will call the callback
+ * whence completed. Mounts the memory card in this device's slot and
+ * confirms there's at least one free block and one free file entry left to
+ * write a save into.
+ *
+ * @param device The save device platform to check availability.
+ */
+void saveDeviceDolphinCardCheckAvailability(savedevice_t *device);
+
+/**
+ * Returns whether the mounted memory card in the given slot has at least
+ * one block of free space and one free file entry remaining, by summing
+ * the block usage of every file already on the card (CARD_GetDirectory)
+ * against the card's total block count (CARD_GetBlockCount) - libogc
+ * doesn't expose a single "free blocks remaining" call.
+ *
+ * @param channel The CARD slot (CARD_SLOTA or CARD_SLOTB) to check. Must
+ *   already be mounted.
+ * @return True if there's room to create at least one more save file.
+ */
+bool_t saveDeviceDolphinCardHasFreeSpace(const int32_t channel);
+
+/**
+ * Disposes of the save device platform.
+ *
+ * @param device The save device platform to dispose.
+ * @return Error state if any.
+ */
+errorret_t saveDeviceDolphinCardDispose(savedevice_t *device);

src/duskdolphin/save/savedevicedolphinnand.c

@@ -0,0 +1,72 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "save/savedevice.h"
+#include "save/savedevicedolphinnand.h"
+#include "assert/assert.h"
+
+errorret_t saveDeviceDolphinNandInit(savedevice_t *device) {
+  assertNotNull(device, "device cannot be null");
+
+  device->state = SAVE_DEVICE_STATE_UNKNOWN;
+
+  errorOk();
+}
+
+errorret_t saveDeviceDolphinNandUpdate(savedevice_t *device) {
+  assertNotNull(device, "device cannot be null");
+  assertIsMainThread("Invalid thread");
+  errorOk();
+}
+
+void saveDeviceDolphinNandCheckAvailability(savedevice_t *device) {
+  assertNotNull(device, "device cannot be null");
+  assertIsMainThread("Invalid thread");
+  assertTrue(
+    device->state == SAVE_DEVICE_STATE_CHECKING_AVAILABILITY,
+    "Device state incorrect?"
+  );
+
+  int32_t result = ISFS_Initialize();
+  if(result != ISFS_OK) {
+    device->state = SAVE_DEVICE_STATE_UNAVAILABLE;
+    device->reasonKey = "save.dolphin.nand_init_failed";
+    return saveDeviceFireCallback(device);
+  }
+  device->platform.initialized = true;
+
+  // Best-effort create - libogc's isfs.h doesn't expose a named "already
+  // exists" result, so the real confirmation is the ISFS_GetUsage() call
+  // below rather than this return value.
+  ISFS_CreateDir(
+    SAVE_DEVICE_DOLPHIN_NAND_DIR, 0, ISFS_OPEN_RW, ISFS_OPEN_RW, ISFS_OPEN_RW
+  );
+
+  uint32_t usedBlocks = 0;
+  uint32_t usedInodes = 0;
+  result = ISFS_GetUsage(
+    SAVE_DEVICE_DOLPHIN_NAND_DIR, &usedBlocks, &usedInodes
+  );
+  if(result != ISFS_OK) {
+    device->state = SAVE_DEVICE_STATE_UNAVAILABLE;
+    device->reasonKey = "save.dolphin.nand_access_denied";
+    return saveDeviceFireCallback(device);
+  }
+
+  device->state = SAVE_DEVICE_STATE_AVAILABLE;
+  device->reasonKey = NULL;
+  saveDeviceFireCallback(device);
+}
+
+errorret_t saveDeviceDolphinNandDispose(savedevice_t *device) {
+  assertNotNull(device, "device cannot be null");
+  if(device->platform.initialized) {
+    ISFS_Deinitialize();
+    device->platform.initialized = false;
+  }
+  errorOk();
+}

src/duskdolphin/save/savedevicedolphinnand.h

@@ -0,0 +1,60 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "error/error.h"
+#include <ogc/isfs.h>
+
+// A private namespace under /title on the Wii's internal NAND, used purely
+// as ISFS storage - not a real installed title/ticket. Only reachable
+// because the Homebrew Channel's <ahb_access/> grants full hardware access,
+// which also disables IOS's normal ES rights checking for the running app;
+// this hasn't been confirmed against real hardware yet (see project memory
+// for the caveat - Dolphin's NAND emulation may not reproduce the same
+// rights-check behavior as a real Wii/vWii).
+#ifndef SAVE_DEVICE_DOLPHIN_NAND_DIR
+  #define SAVE_DEVICE_DOLPHIN_NAND_DIR "/title/00010001/44555348/data"
+#endif
+
+typedef struct {
+  bool_t initialized;
+} savedeviceplatform_t;
+
+typedef struct savedevice_s savedevice_t;
+
+/**
+ * Initializes the save device platform.
+ *
+ * @param device The save device platform to initialize.
+ * @return Error state if any.
+ */
+errorret_t saveDeviceDolphinNandInit(savedevice_t *device);
+
+/**
+ * Updates the save device platform.
+ *
+ * @param device The save device platform to update.
+ * @return Error state if any.
+ */
+errorret_t saveDeviceDolphinNandUpdate(savedevice_t *device);
+
+/**
+ * Requests the device to check its availability, this will call the callback
+ * whence completed. Brings up ISFS and confirms our private save directory
+ * exists (creating it on first run).
+ *
+ * @param device The save device platform to check availability.
+ */
+void saveDeviceDolphinNandCheckAvailability(savedevice_t *device);
+
+/**
+ * Disposes of the save device platform.
+ *
+ * @param device The save device platform to dispose.
+ * @return Error state if any.
+ */
+errorret_t saveDeviceDolphinNandDispose(savedevice_t *device);

src/duskdolphin/save/savedevicedolphinsd.c

@@ -0,0 +1,67 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "save/savedevice.h"
+#include "save/savedevicedolphinsd.h"
+#include "assert/assert.h"
+#include <fat.h>
+#include <sys/stat.h>
+#include <errno.h>
+
+errorret_t saveDeviceDolphinSDInit(savedevice_t *device) {
+  assertNotNull(device, "device cannot be null");
+
+  device->state = SAVE_DEVICE_STATE_UNKNOWN;
+
+  errorOk();
+}
+
+errorret_t saveDeviceDolphinSDUpdate(savedevice_t *device) {
+  assertNotNull(device, "device cannot be null");
+  assertIsMainThread("Invalid thread");
+  errorOk();
+}
+
+void saveDeviceDolphinSDCheckAvailability(savedevice_t *device) {
+  assertNotNull(device, "device cannot be null");
+  assertIsMainThread("Invalid thread");
+  assertTrue(
+    device->state == SAVE_DEVICE_STATE_CHECKING_AVAILABILITY,
+    "Device state incorrect?"
+  );
+
+  // Safe to call more than once - returns true if already mounted.
+  if(!fatInitDefault()) {
+    device->state = SAVE_DEVICE_STATE_UNAVAILABLE;
+    device->reasonKey = "save.dolphin.sd_fat_init_failed";
+    return saveDeviceFireCallback(device);
+  }
+
+  // mkdir() only ever creates one level at a time - create the parent
+  // ("/dusk") before the save directory itself.
+  if(mkdir("/dusk", 0700) != 0 && errno != EEXIST) {
+    device->state = SAVE_DEVICE_STATE_UNAVAILABLE;
+    device->reasonKey = "save.dolphin.sd_mkdir_failed";
+    return saveDeviceFireCallback(device);
+  }
+
+  if(
+    mkdir(SAVE_DEVICE_DOLPHIN_SD_DIRECTORY, 0700) != 0 && errno != EEXIST
+  ) {
+    device->state = SAVE_DEVICE_STATE_UNAVAILABLE;
+    device->reasonKey = "save.dolphin.sd_mkdir_failed";
+    return saveDeviceFireCallback(device);
+  }
+
+  device->state = SAVE_DEVICE_STATE_AVAILABLE;
+  device->reasonKey = NULL;
+  saveDeviceFireCallback(device);
+}
+
+errorret_t saveDeviceDolphinSDDispose(savedevice_t *device) {
+  errorOk();
+}

src/duskdolphin/save/savedevicedolphinsd.h

@@ -0,0 +1,55 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "error/error.h"
+
+// Root directory on whichever device libfat's fatInitDefault() picks as the
+// default (SD slot on Wii, SD Gecko/Slot2 on GameCube) - same mechanism
+// already used for Dolphin asset loading, see assetdolphinfat.c.
+#ifndef SAVE_DEVICE_DOLPHIN_SD_DIRECTORY
+  #define SAVE_DEVICE_DOLPHIN_SD_DIRECTORY "/dusk/save"
+#endif
+
+typedef struct {
+  void *nothing;
+} savedeviceplatform_t;
+
+typedef struct savedevice_s savedevice_t;
+
+/**
+ * Initializes the save device platform.
+ *
+ * @param device The save device platform to initialize.
+ * @return Error state if any.
+ */
+errorret_t saveDeviceDolphinSDInit(savedevice_t *device);
+
+/**
+ * Updates the save device platform.
+ *
+ * @param device The save device platform to update.
+ * @return Error state if any.
+ */
+errorret_t saveDeviceDolphinSDUpdate(savedevice_t *device);
+
+/**
+ * Requests the device to check its availability, this will call the callback
+ * whence completed. Initializes libfat and confirms the save directory
+ * exists (creating it on first run).
+ *
+ * @param device The save device platform to check availability.
+ */
+void saveDeviceDolphinSDCheckAvailability(savedevice_t *device);
+
+/**
+ * Disposes of the save device platform.
+ *
+ * @param device The save device platform to dispose.
+ * @return Error state if any.
+ */
+errorret_t saveDeviceDolphinSDDispose(savedevice_t *device);

src/duskdolphin/save/savedeviceplatform.h

@@ -0,0 +1,44 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+
+// GameCube only ever has the CARD_SLOTA/CARD_SLOTB memory card devices.
+// Wii additionally picks between three storage methods, selected by
+// DUSK_SAVE_WII_METHOD in cmake/targets/wii.cmake:
+//  - NAND (default): real internal storage via ISFS, see
+//    savedevicedolphinnand.h for the caveats around this.
+//  - CARD: reuses the exact same GameCube memory card code, since libogc's
+//    CARD API transparently redirects to Wii's NAND-based GameCube memory
+//    card emulation.
+//  - SD: the SD card via libfat, same mechanism this project already uses
+//    for Dolphin/Wii asset loading (see assetdolphinfat.c).
+#if defined(DUSK_WII) && defined(DUSK_SAVE_WII_METHOD_NAND)
+  #include "savedevicedolphinnand.h"
+  #define SAVE_DEVICE_COUNT 1
+  #define saveDevicePlatformInit saveDeviceDolphinNandInit
+  #define saveDevicePlatformUpdate saveDeviceDolphinNandUpdate
+  #define saveDeviceCheckAvailabilityPlatform \
+    saveDeviceDolphinNandCheckAvailability
+  #define saveDevicePlatformDispose saveDeviceDolphinNandDispose
+#elif defined(DUSK_WII) && defined(DUSK_SAVE_WII_METHOD_SD)
+  #include "savedevicedolphinsd.h"
+  #define SAVE_DEVICE_COUNT 1
+  #define saveDevicePlatformInit saveDeviceDolphinSDInit
+  #define saveDevicePlatformUpdate saveDeviceDolphinSDUpdate
+  #define saveDeviceCheckAvailabilityPlatform \
+    saveDeviceDolphinSDCheckAvailability
+  #define saveDevicePlatformDispose saveDeviceDolphinSDDispose
+#else
+  #include "savedevicedolphincard.h"
+  #define SAVE_DEVICE_COUNT 2
+  #define saveDevicePlatformInit saveDeviceDolphinCardInit
+  #define saveDevicePlatformUpdate saveDeviceDolphinCardUpdate
+  #define saveDeviceCheckAvailabilityPlatform \
+    saveDeviceDolphinCardCheckAvailability
+  #define saveDevicePlatformDispose saveDeviceDolphinCardDispose
+#endif

src/duskdolphin/system/systemdolphin.c

@@ -12,6 +12,11 @@
 #include "console/console.h"
 
 errorret_t systemInitDolphin(void) {
+  // Routes newlib stdout/stderr (printf, and this project's logDebug/
+  // logError) through OSReport, which Dolphin's logger captures under the
+  // OSREPORT category - without this, guest console output goes nowhere.
+  SYS_STDIO_Report(true);
+
   char_t *names[] = {
     "4:3",
     "16:9",
@@ -43,8 +48,8 @@ int32_t systemGetLanguageDolphin(void) {
 
 const localeinfo_t * systemGetLocaleDolphin(void) {
   switch(systemGetLanguageDolphin()) {
-    case CONF_LANG_JAPANESE: return &LOCALE_INFO_JP_JP;
-    case CONF_LANG_SPANISH: return &LOCALE_INFO_ES_MX;
+    case SYS_LANG_JAPANESE: return &LOCALE_INFO_JP_JP;
+    case SYS_LANG_SPANISH: return &LOCALE_INFO_ES_MX;
     default: return &LOCALE_DEFAULT;
   }
 }

src/duskpsp/CMakeLists.txt

@@ -21,5 +21,6 @@ add_subdirectory(log)
 if(DUSK_NETWORK)
   add_subdirectory(network)
 endif()
+add_subdirectory(save)
 add_subdirectory(system)
 add_subdirectory(time)

src/duskpsp/save/CMakeLists.txt

@@ -0,0 +1,9 @@
+# Copyright (c) 2026 Dominic Masters
+#
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+target_sources(${DUSK_LIBRARY_TARGET_NAME}
+  PUBLIC
+    savedevicepsp.c
+)

src/duskpsp/save/savedeviceplatform.h

@@ -0,0 +1,16 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "savedevicepsp.h"
+
+#define SAVE_DEVICE_COUNT 1
+
+#define saveDevicePlatformInit saveDevicePSPInit
+#define saveDevicePlatformUpdate saveDevicePSPUpdate
+#define saveDeviceCheckAvailabilityPlatform saveDevicePSPCheckAvailability
+#define saveDevicePlatformDispose saveDevicePSPDispose

src/duskpsp/save/savedevicepsp.c

@@ -0,0 +1,52 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "save/savedevice.h"
+#include "save/savedevicepsp.h"
+#include "assert/assert.h"
+#include <pspiofilemgr.h>
+
+errorret_t saveDevicePSPInit(savedevice_t *device) {
+  assertNotNull(device, "device cannot be null");
+
+  device->state = SAVE_DEVICE_STATE_UNKNOWN;
+
+  errorOk();
+}
+
+errorret_t saveDevicePSPUpdate(savedevice_t *device) {
+  assertNotNull(device, "device cannot be null");
+  assertIsMainThread("Invalid thread");
+  errorOk();
+}
+
+void saveDevicePSPCheckAvailability(savedevice_t *device) {
+  assertNotNull(device, "device cannot be null");
+  assertIsMainThread("Invalid thread");
+  assertTrue(
+    device->state == SAVE_DEVICE_STATE_CHECKING_AVAILABILITY,
+    "Device state incorrect?"
+  );
+
+  // Confirm the memory stick is actually reachable - the real save/load
+  // (via sceUtilitySavedata) only reports failure once a save/load is
+  // attempted, so this is checked separately up front.
+  SceIoStat stat;
+  if(sceIoGetstat(SAVE_DEVICE_PSP_ROOT, &stat) < 0) {
+    device->state = SAVE_DEVICE_STATE_UNAVAILABLE;
+    device->reasonKey = "save.psp.no_memory_stick";
+    return saveDeviceFireCallback(device);
+  }
+
+  device->state = SAVE_DEVICE_STATE_AVAILABLE;
+  device->reasonKey = NULL;
+  saveDeviceFireCallback(device);
+}
+
+errorret_t saveDevicePSPDispose(savedevice_t *device) {
+  errorOk();
+}

src/duskpsp/save/savedevicepsp.h

@@ -0,0 +1,52 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "error/error.h"
+
+// PSP only ever exposes one save device - the memory stick.
+#ifndef SAVE_DEVICE_PSP_ROOT
+  #define SAVE_DEVICE_PSP_ROOT "ms0:/"
+#endif
+
+typedef struct {
+  void *nothing;
+} savedeviceplatform_t;
+
+typedef struct savedevice_s savedevice_t;
+
+/**
+ * Initializes the save device platform.
+ *
+ * @param device The save device platform to initialize.
+ * @return Error state if any.
+ */
+errorret_t saveDevicePSPInit(savedevice_t *device);
+
+/**
+ * Updates the save device platform.
+ *
+ * @param device The save device platform to update.
+ * @return Error state if any.
+ */
+errorret_t saveDevicePSPUpdate(savedevice_t *device);
+
+/**
+ * Requests the device to check its availability, this will call the callback
+ * whence completed.
+ *
+ * @param device The save device platform to check availability.
+ */
+void saveDevicePSPCheckAvailability(savedevice_t *device);
+
+/**
+ * Disposes of the save device platform.
+ *
+ * @param device The save device platform to dispose.
+ * @return Error state if any.
+ */
+errorret_t saveDevicePSPDispose(savedevice_t *device);