Speedup SD card & enlarge your RAM. (#1649)

* FuriHal: sram2 memory manager
* FuriHal: sram2 memory allocator
* FuriHal: allow NULL buffers for txrx in spi hal
* SD card: sector cache
* FuriHal: fix init in memory hal
* RPC: STARTUP instead SERVICE
* Memory: pool "free" command
* Thread: service can be statically allocated in a memory pool

Co-authored-by: あく <alleteam@gmail.com>

firmware/targets/f7/fatfs/sector_cache.c

@@ -0,0 +1,59 @@
+#include "sector_cache.h"
+
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+#include <furi.h>
+#include <furi_hal_memory.h>
+
+#define SECTOR_SIZE 512
+#define N_SECTORS 8
+
+typedef struct {
+    uint32_t itr;
+    uint32_t sectors[N_SECTORS];
+    uint8_t sector_data[N_SECTORS][SECTOR_SIZE];
+} SectorCache;
+
+static SectorCache* cache = NULL;
+
+void sector_cache_init() {
+    if(cache == NULL) {
+        cache = furi_hal_memory_alloc(sizeof(SectorCache));
+    }
+
+    if(cache != NULL) {
+        FURI_LOG_I("SectorCache", "Initializing sector cache");
+        memset(cache, 0, sizeof(SectorCache));
+    } else {
+        FURI_LOG_E("SectorCache", "Cannot enable sector cache");
+    }
+}
+
+uint8_t* sector_cache_get(uint32_t n_sector) {
+    if(cache != NULL && n_sector != 0) {
+        for(int sector_i = 0; sector_i < N_SECTORS; ++sector_i) {
+            if(cache->sectors[sector_i] == n_sector) {
+                return cache->sector_data[sector_i];
+            }
+        }
+    }
+    return NULL;
+}
+
+void sector_cache_put(uint32_t n_sector, uint8_t* data) {
+    if(cache == NULL) return;
+    cache->sectors[cache->itr % N_SECTORS] = n_sector;
+    memcpy(cache->sector_data[cache->itr % N_SECTORS], data, SECTOR_SIZE);
+    cache->itr++;
+}
+
+void sector_cache_invalidate_range(uint32_t start_sector, uint32_t end_sector) {
+    if(cache == NULL) return;
+    for(int sector_i = 0; sector_i < N_SECTORS; ++sector_i) {
+        if((cache->sectors[sector_i] >= start_sector) &&
+           (cache->sectors[sector_i] <= end_sector)) {
+            cache->sectors[sector_i] = 0;
+        }
+    }
+}