Merge pull request #8 from ariahiro64/ed64-basic

ED64P Saves and virtual writeback

Makefile

@@ -24,6 +24,7 @@ SRCS = \
 	flashcart/sc64/sc64_ll.c \
 	flashcart/sc64/sc64.c \
 	flashcart/ed64/ed64_ll.c \
+	flashcart/ed64/ed64_state.c \
 	flashcart/ed64/ed64.c \
 	libs/libspng/spng/spng.c \
 	libs/mini.c/src/mini.c \

src/flashcart/ed64/ed64.c

@@ -4,6 +4,7 @@
 
 #include <fatfs/ff.h>
 #include <libdragon.h>
+#include <libcart/cart.h>
 
 #include "utils/fs.h"
 #include "utils/utils.h"
@@ -11,15 +12,10 @@
 #include "../flashcart_utils.h"
 #include "ed64_ll.h"
 #include "ed64.h"
+#include "ed64_state.h"
 
 
-// #include "../menu/settings.h"
+static ed64_pseudo_writeback_t current_state;
-
-// // This is a trial hack before using the settings API.
-// #ifndef LAST_ROM_FILE_PATH
-// #define LAST_ROM_FILE_PATH "/ed64/last_rom.txt"
-// #endif
-
 
 extern int ed_exit (void);
 
@@ -30,27 +26,64 @@ static flashcart_err_t ed64_init (void) {
     // FIXME: Update firmware if needed.
     // FIXME: Enable RTC if available.
 
-    // FIXME: Retrive a config file from the SD card that might have been set.
+    // older everdrives cannot save during gameplay so we need to the reset method.
-    // This should include the location of the ROM and its save type.
+    // works by checking if a file exists.
-    // Then, if it is valid, perform a save.
-    // FIL lrp_fil;
-    // UINT lrp_br;
 
-    // if (f_open(&lrp_fil, LAST_ROM_PATH_FILE, FA_READ) != FR_OK) {
+    ed64_state_load(&current_state);
-    //     return FLASHCART_ERR_LOAD;
-    // }
 
-    // if (f_read(&lrp_fil, lrp_path, 1024, &lrp_br) != FR_OK) {
+    if (current_state.is_expecting_save_writeback == true) {
-    //     f_close(&lrp_fil);
-    //     return FLASHCART_ERR_LOAD;
-    // }
 
-    // if (f_close(&lrp_fil) != FR_OK) {
+        // make sure next boot doesnt trigger the check changing its state.
-    //     return FLASHCART_ERR_LOAD;
+        current_state.is_expecting_save_writeback = false;
-    // }
+        ed64_state_save(&current_state);
 
-    // Now save the content back to the SD!
+        // Now save the content back to the SD card!
+        FIL fil;
+        UINT bw;
+        uint8_t cartsave_data[KiB(128)];
 
+        // find the path to last save
+        if (file_exists(strip_sd_prefix(current_state.last_save_path))) {
+
+            int save_size = file_get_size(strip_sd_prefix(current_state.last_save_path));
+
+            if ((f_open(&fil, strip_sd_prefix(current_state.last_save_path), FA_CREATE_ALWAYS | FA_READ | FA_WRITE)) != FR_OK) {
+                return FLASHCART_ERR_LOAD;
+            }
+
+            // everdrive doesn't care about the save type other than flash sram and eeprom
+            // so minus flashram we can just check the size
+            if (current_state.is_fram_save_type == true) { // flashram is bugged atm
+               ed64_ll_get_fram(cartsave_data, save_size);
+              // deletes flag
+              current_state.is_fram_save_type = false;
+              ed64_state_save(&current_state);
+            }
+            else if (save_size > KiB(32)) { // sram 128
+               ed64_ll_get_sram(cartsave_data, save_size);
+            }
+            else if (save_size > KiB(2)) { // sram
+               ed64_ll_get_sram(cartsave_data, save_size);
+            }
+            else { // eeprom
+               ed64_ll_get_eeprom(cartsave_data, save_size);
+            }
+
+            if (f_write(&fil, cartsave_data, save_size, &bw) != FR_OK) {
+                return FLASHCART_ERR_LOAD;
+            }
+
+            if (f_close(&fil) != FR_OK) {
+                return FLASHCART_ERR_LOAD;
+            }
+        }
+        else {
+            current_state.is_expecting_save_writeback = false;
+            current_state.is_fram_save_type = false;
+            current_state.last_save_path = "";
+            ed64_state_save(&current_state);
+        }
+    }
     return FLASHCART_OK;
 }
 
@@ -64,12 +97,15 @@ static flashcart_err_t ed64_deinit (void) {
 
 static bool ed64_has_feature (flashcart_features_t feature) {
     switch (feature) {
-        case FLASHCART_FEATURE_64DD: return false;
+    case FLASHCART_FEATURE_64DD:
-        default: return false;
+        return false;
+    default:
+        return false;
     }
 }
 
 static flashcart_err_t ed64_load_rom (char *rom_path, flashcart_progress_callback_t *progress) {
+
     FIL fil;
     UINT br;
 
@@ -83,15 +119,31 @@ static flashcart_err_t ed64_load_rom (char *rom_path, flashcart_progress_callbac
 
     // FIXME: if the cart is not V3 or X5 or X7, we need probably need to - 128KiB for save compatibility.
     // Or somehow warn that certain ROM's will have corruption due to the address space being used for saves.
+    // Conker's Bad Fur Day doesn't have this issue because eeprom data is at a fixed address in pif ram.
     if (rom_size > MiB(64)) {
         f_close(&fil);
         return FLASHCART_ERR_LOAD;
     }
 
+    if (rom_size == MiB(64)) {
+            ed64_save_type_t type = ed64_ll_get_save_type();
+            switch (type) {
+            case SAVE_TYPE_SRAM:
+                rom_size -= KiB(32) - KiB(16);
+            case SAVE_TYPE_SRAM_128K:
+            case SAVE_TYPE_FLASHRAM:
+                rom_size -= KiB(128) - KiB(16);
+            break;
+            default:
+            break;
+        }
+    }
+    
     size_t sdram_size = rom_size;
 
     size_t chunk_size = MiB(1);
-    for (int offset = 0; offset < sdram_size; offset += chunk_size) {
+    for (int offset = 0; offset < sdram_size; offset += chunk_size)
+    {
         size_t block_size = MIN(sdram_size - offset, chunk_size);
         if (f_read(&fil, (void *)(ROM_ADDRESS + offset), block_size, &br) != FR_OK) {
             f_close(&fil);
@@ -101,40 +153,20 @@ static flashcart_err_t ed64_load_rom (char *rom_path, flashcart_progress_callbac
             progress(f_tell(&fil) / (float)(f_size(&fil)));
         }
     }
-    if (f_tell(&fil) != sdram_size) {
+    /*if (f_tell(&fil) != sdram_size) {
         f_close(&fil);
         return FLASHCART_ERR_LOAD;
-    }
+    }*/
-
 
     if (f_close(&fil) != FR_OK) {
         return FLASHCART_ERR_LOAD;
     }
 
-    
-    // Set the required actions for retriving the save file later.
-    // Given there is no good place in RAM...
-    // This would involve creating some content to a file on the SD card that includes:
-    // the ROM name and location and possibly its save type. This information will be used on init to perform a "save writeback".
-    // Actually, we should be using the settings API, so this is just a trial hack.
-    // FIL lrp_fil;
-    // UINT lrp_bw;
-    
-    // if (f_open(&lrp_fil, LAST_ROM_FILE_PATH, FA_CREATE_ALWAYS) != FR_OK) {
-    //     return FLASHCART_ERR_LOAD;
-    // }
-    // if (f_write(&lrp_fil, rom_path, strlen(rom_path) + 1, &lrp_bw) != FR_OK) {
-    //     f_close(&lrp_fil);
-    //     return FLASHCART_ERR_LOAD;
-    // }
-    // if (f_close(&lrp_fil) != FR_OK) {
-    //     return FLASHCART_ERR_LOAD;
-    // }
-
     return FLASHCART_OK;
 }
 
-static flashcart_err_t ed64_load_file (char *file_path, uint32_t rom_offset, uint32_t file_offset) {
+static flashcart_err_t ed64_load_file (char *file_path, uint32_t rom_offset, uint32_t file_offset)
+{
     FIL fil;
     UINT br;
 
@@ -148,6 +180,7 @@ static flashcart_err_t ed64_load_file (char *file_path, uint32_t rom_offset, uin
 
     // FIXME: if the cart is not V3 or X5 or X7, we need probably need to - 128KiB for save compatibility.
     // Or somehow warn that certain ROM's will have corruption due to the address space being used for saves.
+
     if (file_size > (MiB(64) - rom_offset)) {
         f_close(&fil);
         return FLASHCART_ERR_ARGS;
@@ -175,32 +208,19 @@ static flashcart_err_t ed64_load_file (char *file_path, uint32_t rom_offset, uin
 }
 
 static flashcart_err_t ed64_load_save (char *save_path) {
-    void *address =  NULL;
-    ed64_save_type_t type = ed64_ll_get_save_type();
-
-    switch (type) {
-        case SAVE_TYPE_EEPROM_4K:
-        case SAVE_TYPE_EEPROM_16K:
-        case SAVE_TYPE_SRAM:
-        case SAVE_TYPE_SRAM_128K:
-        case SAVE_TYPE_FLASHRAM:
-            address = (void *) (SRAM_ADDRESS);
-            break;
-        case SAVE_TYPE_NONE:
-        default:
-            return FLASHCART_ERR_ARGS;
-    }
     
     FIL fil;
     UINT br;
 
     if (f_open(&fil, strip_sd_prefix(save_path), FA_READ) != FR_OK) {
+        f_close(&fil);
         return FLASHCART_ERR_LOAD;
     }
 
-    size_t save_size = f_size(&fil);
+    size_t save_size = file_get_size(strip_sd_prefix(save_path));
+    uint8_t cartsave_data[save_size];
 
-    if (f_read(&fil, address, save_size, &br) != FR_OK) {
+    if (f_read(&fil, cartsave_data, save_size, &br) != FR_OK) {
         f_close(&fil);
         return FLASHCART_ERR_LOAD;
     }
@@ -209,10 +229,35 @@ static flashcart_err_t ed64_load_save (char *save_path) {
         return FLASHCART_ERR_LOAD;
     }
 
-    if (br != save_size) {
+    current_state.is_fram_save_type = false;
-        return FLASHCART_ERR_LOAD;
+
+    ed64_save_type_t type = ed64_ll_get_save_type();
+    switch (type) {
+    case SAVE_TYPE_EEPROM_4K:
+    case SAVE_TYPE_EEPROM_16K:
+       ed64_ll_set_eeprom(cartsave_data, save_size);
+        break;
+    case SAVE_TYPE_SRAM:
+       ed64_ll_set_sram(cartsave_data, save_size);
+    case SAVE_TYPE_SRAM_128K:
+       ed64_ll_set_sram_128(cartsave_data, KiB(128));
+        break;
+    case SAVE_TYPE_FLASHRAM:
+       ed64_ll_set_fram(cartsave_data, KiB(128));
+        // a cold and warm boot has no way of seeing save types and most types can be determined by size
+        // this tells the cart to use flash instead of sram 128 since they are the same size
+        current_state.is_fram_save_type = true;
+        ed64_state_save(&current_state);
+        break;
+    default:
+       break;
     }
 
+
+    current_state.last_save_path = save_path;
+    current_state.is_expecting_save_writeback = true;
+    ed64_state_save(&current_state);
+
     return FLASHCART_OK;
 }
 
@@ -249,7 +294,6 @@ static flashcart_err_t ed64_set_save_type (flashcart_save_type_t save_type) {
     return FLASHCART_OK;
 }
 
-
 static flashcart_t flashcart_ed64 = {
     .init = ed64_init,
     .deinit = ed64_deinit,
@@ -263,7 +307,6 @@ static flashcart_t flashcart_ed64 = {
     .set_save_writeback = NULL,
 };
 
-
 flashcart_t *ed64_get_flashcart (void) {
     return &flashcart_ed64;
 }

src/flashcart/ed64/ed64_ll.c

@@ -1,8 +1,10 @@
+#include <malloc.h>
 #include <libdragon.h>
-
+#include "utils/utils.h"
 #include "ed64_ll.h"
 
 
+
 /* ED64 configuration registers base address  */
 #define ED64_CONFIG_REGS_BASE (0xA8040000)
 
@@ -23,6 +25,16 @@ typedef enum {
 
 } ed64_registers_t;
 
+void pi_initialize (void);
+void pi_initialize_sram (void);
+void pi_dma_from_cart (void* dest, void* src, unsigned long size);
+void pi_dma_to_cart (void* dest, void* src, unsigned long size);
+void pi_dma_from_sram (void *dest, unsigned long offset, unsigned long size);
+void pi_dma_to_sram (void* src, unsigned long offset, unsigned long size);
+void pi_dma_from_cart_safe (void *dest, void *src, unsigned long size);
+
+void ed64_ll_set_sdcard_timing (void);
+
 
 #define SAV_EEP_ON 1
 #define SAV_SRM_ON 2
@@ -43,6 +55,7 @@ uint32_t ed64_ll_reg_read(uint32_t reg) {
 
     *(volatile uint32_t *) (ED64_CONFIG_REGS_BASE);
     return *(volatile uint32_t *) (ED64_CONFIG_REGS_BASE + reg * 4);
+
 }
 
 void ed64_ll_reg_write (uint32_t reg, uint32_t data) {
@@ -54,9 +67,10 @@ void ed64_ll_reg_write(uint32_t reg, uint32_t data) {
 }
 
 
-ed64_save_type_t ed64_ll_get_save_type() {
+ed64_save_type_t ed64_ll_get_save_type (void) {
 
     return ed64_ll_save_type;
+
 }
 
 void ed64_ll_set_save_type (ed64_save_type_t type) {
@@ -97,7 +111,6 @@ void ed64_ll_set_save_type(ed64_save_type_t type) {
             break;
     }
 
-    save_cfg = 0;
     if (eeprom_on)save_cfg |= SAV_EEP_ON;
     if (sram_on)save_cfg |= SAV_SRM_ON;
     if (eeprom_size)save_cfg |= SAV_EEP_SIZE;
@@ -114,3 +127,279 @@ void ed64_ll_set_sram_bank(uint8_t bank) {
     ed64_ll_sram_bank = bank == 0 ? 0 : 1;
 
 }
+
+
+void pi_initialize (void) {
+
+	dma_wait();
+	io_write(PI_STATUS_REG, 0x03);
+
+}
+
+// Inits PI for sram transfer
+void pi_initialize_sram (void) {
+
+	io_write(PI_BSD_DOM2_LAT_REG, 0x05);
+	io_write(PI_BSD_DOM2_PWD_REG, 0x0C);
+	io_write(PI_BSD_DOM2_PGS_REG, 0x0D);
+	io_write(PI_BSD_DOM2_RLS_REG, 0x02);
+
+}
+
+void pi_dma_from_sram (void *dest, unsigned long offset, unsigned long size) {
+
+	io_write(PI_DRAM_ADDR_REG, K1_TO_PHYS(dest));
+	io_write(PI_CART_ADDR_REG, (0xA8000000 + offset));
+	 asm volatile ("" : : : "memory");
+	io_write(PI_WR_LEN_REG, (size - 1));
+	 asm volatile ("" : : : "memory");
+
+}
+
+
+void pi_dma_to_sram (void *src, unsigned long offset, unsigned long size) {
+
+	dma_wait();
+
+	io_write(PI_STATUS_REG, 2);
+	io_write(PI_DRAM_ADDR_REG, K1_TO_PHYS(src));
+	io_write(PI_CART_ADDR_REG, (0xA8000000 + offset));
+	io_write(PI_RD_LEN_REG, (size - 1));
+
+}
+
+void pi_dma_from_cart (void* dest, void* src, unsigned long size) {
+
+	dma_wait();
+
+	io_write(PI_STATUS_REG, 0x03);
+	io_write(PI_DRAM_ADDR_REG, K1_TO_PHYS(dest));
+	io_write(PI_CART_ADDR_REG, K0_TO_PHYS(src));
+	io_write(PI_WR_LEN_REG, (size - 1));
+
+}
+
+
+void pi_dma_to_cart (void* dest, void* src, unsigned long size) {
+
+	dma_wait();
+
+	io_write(PI_STATUS_REG, 0x02);
+	io_write(PI_DRAM_ADDR_REG, K1_TO_PHYS(src));
+	io_write(PI_CART_ADDR_REG, K0_TO_PHYS(dest));
+	io_write(PI_RD_LEN_REG, (size - 1));
+
+}
+
+
+// Wrapper to support unaligned access to memory
+void pi_dma_from_cart_safe (void *dest, void *src, unsigned long size) {
+
+	if (!dest || !src || !size) return;
+
+	unsigned long unalignedSrc  = ((unsigned long)src)  % 2;
+	unsigned long unalignedDest = ((unsigned long)dest) % 8;
+
+	//FIXME: Do i really need to check if size is 16bit aligned?
+	if (!unalignedDest && !unalignedSrc && !(size % 2)) {
+		pi_dma_from_cart(dest, src, size);
+		dma_wait();
+
+		return;
+	}
+
+	void* newSrc = (void*)(((unsigned long)src) - unalignedSrc);
+	unsigned long newSize = (size + unalignedSrc) + ((size + unalignedSrc) % 2);
+
+	unsigned char *buffer = memalign(8, newSize);
+	pi_dma_from_cart(buffer, newSrc, newSize);
+	dma_wait();
+
+	memcpy(dest, (buffer + unalignedSrc), size);
+
+	free(buffer);
+
+}
+
+
+int ed64_ll_get_sram_128 (uint8_t *buffer, int size) {
+
+    dma_wait();
+
+    io_write(PI_BSD_DOM2_LAT_REG, 0x05);
+    io_write(PI_BSD_DOM2_PWD_REG, 0x0C);
+    io_write(PI_BSD_DOM2_PGS_REG, 0x0D);
+    io_write(PI_BSD_DOM2_RLS_REG, 0x02);
+
+    dma_wait();
+
+    pi_initialize();
+
+    dma_wait();
+
+    pi_dma_from_sram(buffer, -(size - KiB(16)), size) ;
+
+    dma_wait();
+
+    io_write(PI_BSD_DOM2_LAT_REG, 0x40);
+    io_write(PI_BSD_DOM2_PWD_REG, 0x12);
+    io_write(PI_BSD_DOM2_PGS_REG, 0x07);
+    io_write(PI_BSD_DOM2_RLS_REG, 0x03);
+
+    return 1;
+
+}
+
+
+int ed64_ll_get_sram (uint8_t *buffer, int size) {
+
+    dma_wait();
+
+    io_write(PI_BSD_DOM2_LAT_REG, 0x05);
+    io_write(PI_BSD_DOM2_PWD_REG, 0x0C);
+    io_write(PI_BSD_DOM2_PGS_REG, 0x0D);
+    io_write(PI_BSD_DOM2_RLS_REG, 0x02);
+
+    dma_wait();
+
+    pi_initialize();
+
+    dma_wait();
+
+    pi_dma_from_sram(buffer, 0, size) ;
+
+    dma_wait();
+
+    io_write(PI_BSD_DOM2_LAT_REG, 0x40);
+    io_write(PI_BSD_DOM2_PWD_REG, 0x12);
+    io_write(PI_BSD_DOM2_PGS_REG, 0x07);
+    io_write(PI_BSD_DOM2_RLS_REG, 0x03);
+
+    return 1;
+
+}
+
+int ed64_ll_get_eeprom (uint8_t *buffer, int size) {
+
+    int blocks=size/8;
+    for( int b = 0; b < blocks; b++ ) {
+        eeprom_read( b, &buffer[b * 8] );
+    }
+
+    return 1;
+
+}
+
+
+int ed64_ll_get_fram (uint8_t *buffer, int size) {
+
+    ed64_ll_set_save_type(SAVE_TYPE_SRAM_128K); //2
+    dma_wait();
+
+    ed64_ll_get_sram_128(buffer, size);
+    data_cache_hit_writeback_invalidate(buffer, size);
+
+    dma_wait();
+    ed64_ll_set_save_type(SAVE_TYPE_FLASHRAM);
+
+    return 1;
+
+}
+
+/*
+sram upload
+*/
+
+
+int ed64_ll_set_sram_128 (uint8_t *buffer, int size) {
+
+    //half working
+    dma_wait();
+    //Timing
+    pi_initialize_sram();
+
+    //Readmode
+    pi_initialize();
+
+    data_cache_hit_writeback_invalidate(buffer,size);
+    dma_wait();
+
+    pi_dma_to_sram(buffer, -(size - KiB(16)), size);
+    data_cache_hit_writeback_invalidate(buffer,size);
+
+    //Wait
+    dma_wait();
+    //Restore evd Timing
+    ed64_ll_set_sdcard_timing();
+
+    return 1;
+
+}
+
+
+int ed64_ll_set_sram (uint8_t *buffer, int size) {
+
+    //half working
+    dma_wait();
+    //Timing
+    pi_initialize_sram();
+
+    //Readmode
+    pi_initialize();
+
+    data_cache_hit_writeback_invalidate(buffer,size);
+    dma_wait();
+
+    pi_dma_to_sram(buffer, 0, size);
+    data_cache_hit_writeback_invalidate(buffer,size);
+
+    //Wait
+    dma_wait();
+    //Restore evd Timing
+    ed64_ll_set_sdcard_timing();
+
+    return 1;
+
+}
+
+
+int ed64_ll_set_eeprom (uint8_t *buffer, int size) {
+
+    int blocks=size/8;
+    for( int b = 0; b < blocks; b++ ) {
+        eeprom_write( b, &buffer[b * 8] );
+    }
+
+    return 1;
+
+}
+
+int ed64_ll_set_fram (uint8_t *buffer, int size) {
+
+    ed64_ll_set_save_type(SAVE_TYPE_SRAM_128K);
+    dma_wait();
+
+    ed64_ll_set_sram_128(buffer, size);
+    data_cache_hit_writeback_invalidate(buffer, size);
+
+    dma_wait();
+    ed64_ll_set_save_type(SAVE_TYPE_FLASHRAM);
+
+    return 1;
+
+}
+
+
+void ed64_ll_set_sdcard_timing (void) {
+
+    io_write(PI_BSD_DOM1_LAT_REG, 0x40);
+    io_write(PI_BSD_DOM1_PWD_REG, 0x12);
+    io_write(PI_BSD_DOM1_PGS_REG, 0x07);
+    io_write(PI_BSD_DOM1_RLS_REG, 0x03);
+
+    io_write(PI_BSD_DOM2_LAT_REG, 0x40);
+    io_write(PI_BSD_DOM2_PWD_REG, 0x12);
+    io_write(PI_BSD_DOM2_PGS_REG, 0x07);
+    io_write(PI_BSD_DOM2_RLS_REG, 0x03);
+
+}

src/flashcart/ed64/ed64_ll.h

@@ -7,11 +7,44 @@
 #ifndef FLASHCART_ED64_LL_H__
 #define FLASHCART_ED64_LL_H__
 
-
+#include <stdlib.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdbool.h>
 
+// FIXME: redefined because its in a .c instead of a .h
+#define PI_BASE_REG		    0x04600000
+///////////////////////////////////////////////////////
+
+#define PIF_RAM_START		0x1FC007C0
+#define	PI_STATUS_ERROR		0x04
+#define	PI_STATUS_IO_BUSY	0x02
+#define	PI_STATUS_DMA_BUSY	0x01
+
+#define PI_STATUS_REG		(PI_BASE_REG+0x10)
+#define PI_DRAM_ADDR_REG	(PI_BASE_REG+0x00)	/* DRAM address */
+#define PI_CART_ADDR_REG	(PI_BASE_REG+0x04)
+#define PI_RD_LEN_REG		(PI_BASE_REG+0x08)
+#define PI_WR_LEN_REG		(PI_BASE_REG+0x0C)
+
+// FIXME: redefined because its in a .c instead of a .h
+#define PI_BSD_DOM1_LAT_REG     (PI_BASE_REG+0x14)
+#define PI_BSD_DOM1_PWD_REG     (PI_BASE_REG+0x18)
+#define PI_BSD_DOM1_PGS_REG     (PI_BASE_REG+0x1C)
+#define PI_BSD_DOM1_RLS_REG     (PI_BASE_REG+0x20)
+#define PI_BSD_DOM2_LAT_REG     (PI_BASE_REG+0x24)
+#define PI_BSD_DOM2_PWD_REG     (PI_BASE_REG+0x28)
+#define PI_BSD_DOM2_PGS_REG     (PI_BASE_REG+0x2C)
+#define PI_BSD_DOM2_RLS_REG     (PI_BASE_REG+0x30)
+///////////////////////////////////////////////////////
+
+#define	PHYS_TO_K0(x)	((unsigned long)(x)|0x80000000)	/* physical to kseg0 */
+#define	K0_TO_PHYS(x)	((unsigned long)(x)&0x1FFFFFFF)	/* kseg0 to physical */
+#define	PHYS_TO_K1(x)	((unsigned long)(x)|0xA0000000)	/* physical to kseg1 */
+#define	K1_TO_PHYS(x)	((unsigned long)(x)&0x1FFFFFFF)	/* kseg1 to physical */
+
+
+
 /**
  * @addtogroup ed64
  * @{
@@ -29,15 +62,22 @@ typedef enum {
     SAVE_TYPE_DD64 = 16,
 } ed64_save_type_t;
 
-
-#define SRAM_ADDRESS (0x1FFE2000)
 #define ROM_ADDRESS  (0xB0000000)
 
 /* Save functions */
-void ed64_ll_set_ram_bank(uint8_t bank);
+void ed64_ll_set_sram_bank (uint8_t bank);
 ed64_save_type_t ed64_ll_get_save_type ();
 void ed64_ll_set_save_type (ed64_save_type_t type);
 
-/** @} */ /* ed64 */
+int ed64_ll_get_sram_128 (uint8_t *buffer, int size);
+int ed64_ll_get_sram (uint8_t *buffer, int size);
+int ed64_ll_get_eeprom (uint8_t *buffer, int size);
+int ed64_ll_get_fram (uint8_t *buffer, int size);
 
+int ed64_ll_set_sram_128 (uint8_t *buffer, int size);
+int ed64_ll_set_sram (uint8_t *buffer, int size);
+int ed64_ll_set_eeprom (uint8_t *buffer, int size);
+int ed64_ll_set_fram (uint8_t *buffer, int size);
+
+/** @} */ /* ed64 */
 #endif

src/flashcart/ed64/ed64_state.c

@@ -0,0 +1,42 @@
+#include <libdragon.h>
+#include <mini.c/src/mini.h>
+
+#include "ed64_state.h"
+#include "utils/fs.h"
+
+#ifndef ED64_STATE_FILE_PATH
+#define ED64_STATE_FILE_PATH  "sd:/menu/ed64_state.ini"
+#endif
+
+static ed64_pseudo_writeback_t init = {
+    .is_expecting_save_writeback = false,
+    .is_fram_save_type = false,
+    .last_save_path = ""
+};
+
+
+void ed64_state_load (ed64_pseudo_writeback_t *state) {
+    if (!file_exists(ED64_STATE_FILE_PATH)) {
+        ed64_state_save(&init);
+    }
+
+    mini_t *ini = mini_try_load(ED64_STATE_FILE_PATH);
+
+    state->is_expecting_save_writeback = mini_get_bool(ini, "ed64", "is_expecting_save_writeback", init.is_expecting_save_writeback);
+    state->is_fram_save_type = mini_get_bool(ini, "ed64", "is_fram_save_type", init.is_fram_save_type);
+    state->last_save_path = strdup(mini_get_string(ini, "ed64", "last_save_path", init.last_save_path));
+
+    mini_free(ini);
+}
+
+void ed64_state_save (ed64_pseudo_writeback_t *state) {
+    mini_t *ini = mini_create(ED64_STATE_FILE_PATH);
+
+    mini_set_bool(ini, "ed64", "is_expecting_save_writeback", state->is_expecting_save_writeback);
+    mini_set_bool(ini, "ed64", "is_fram_save_type", state->is_fram_save_type);
+    mini_set_string(ini, "ed64", "last_save_path", state->last_save_path);
+
+    mini_save(ini);
+
+    mini_free(ini);
+}

src/flashcart/ed64/ed64_state.h

@@ -0,0 +1,24 @@
+/**
+ * @file e664_state.h
+ * @brief ED64 state
+ * @ingroup flashcart
+ */
+
+#ifndef FLASHCART_ED64_STATE_H__
+#define FLASHCART_ED64_STATE_H__
+
+/** @brief ED64 Pseudo Writeback Structure */
+typedef struct {
+/** @brief The reset button was used */
+    bool is_expecting_save_writeback;
+/** @brief The last save type was flash ram */
+    bool is_fram_save_type;
+/** @brief The path to the last loaded ROM */
+    char *last_save_path;
+} ed64_pseudo_writeback_t;
+
+void ed64_state_load (ed64_pseudo_writeback_t *state);
+void ed64_state_save (ed64_pseudo_writeback_t *state);
+
+
+#endif