feat: Adds mmap backend for nvram

UCSD-E4E · Dec 23, 2024 · 8c86d22 · 8c86d22
1 parent 5b40a24
commit 8c86d22
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Showing 2 changed files with 70 additions and 10 deletions.
diff --git a/src/sys/NVRAM.cpp b/src/sys/NVRAM.cpp
@@ -10,13 +10,16 @@
  */
 #include "NVRAM.hpp"
 
-
 #include "cli/conio.hpp"
 #include "consts.hpp"
+#include "product.hpp"
 
 #include <cstddef>
 
+#if SF_PLATFORM == SF_PLATFORM_PARTICLE
 #include "Particle.h"
+#elif SF_PLATFORM == SF_PLATFORM_GLIBC
+#endif
 
 NVRAM& NVRAM::getInstance(void)
 {

diff --git a/src/sys/NVRAM.hpp b/src/sys/NVRAM.hpp
@@ -1,7 +1,18 @@
 #ifndef __NVRAM_HPP__
 #define __NVRAM_HPP__
-
+#include "product.hpp"
+#if SF_PLATFORM == SF_PLATFORM_PARTICLE
 #include "Particle.h"
+#elif SF_PLATFORM == SF_PLATFORM_GLIBC
+#include "cli/conio.hpp"
+#include "consts.hpp"
+
+#include <cstring>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#endif
 
 #include <cstdint>
 class NVRAM
@@ -55,7 +66,7 @@ class NVRAM
      * @param pData Data
      * @return int Sucsess
      */
-    template <typename T> int get(DATA_ID_e dataID, T& pData)
+    template <typename T> int get(DATA_ID_e dataID, T &rData)
     {
         uint32_t addr;
         const NVRAM::nvramTableEntry_t* tableEntry;
@@ -66,13 +77,17 @@ class NVRAM
             return 0;
         }
 
-        if(sizeof(pData) != tableEntry->len)
+        if (sizeof(rData) != tableEntry->len)
         {
             return 0;
         }
 
         addr = tableEntry->addr;
+#if SF_PLATFORM == SF_PLATFORM_PARTICLE
         EEPROM.get(addr, pData);
+#elif SF_PLATFORM == SF_PLATFORM_GLIBC
+        std::memcpy(&rData, eeprom_mmap + addr, sizeof(T));
+#endif
         return 1;
     }
 
@@ -84,7 +99,7 @@ class NVRAM
      * @param pData data
      * @return int Sucsess value
      */
-    template <typename T> int put(DATA_ID_e dataID, const T& pData)
+    template <typename T> int put(DATA_ID_e dataID, const T &rData)
     {
         uint32_t addr;
         const NVRAM::nvramTableEntry_t* tableEntry;
@@ -95,23 +110,65 @@ class NVRAM
             return 0;
         }
 
-        if(sizeof(pData) != tableEntry->len)
+        if (sizeof(rData) != tableEntry->len)
         {
             return 0;
         }
 
         addr = tableEntry->addr;
+#if SF_PLATFORM == SF_PLATFORM_PARTICLE
         EEPROM.put(addr, pData);
+#elif SF_PLATFORM == SF_PLATFORM_GLIBC
+        std::memcpy(eeprom_mmap + addr, &rData, sizeof(T));
+#endif
         return 1;
     }
 
 
     void displayNVRAM(void);
 
     private:
-    const nvramTableEntry_t* getTableEntry(DATA_ID_e);
-    NVRAM(){}
-    NVRAM(NVRAM const&);
-    void operator=(NVRAM const&);
+#if SF_PLATFORM == SF_PLATFORM_GLIBC
+        int eeprom_fp;
+        char *eeprom_mmap = 0;
+        size_t eeprom_length = 0;
+#endif
+        const nvramTableEntry_t *getTableEntry(DATA_ID_e);
+        NVRAM()
+        {
+#if SF_PLATFORM == SF_PLATFORM_GLIBC
+            eeprom_fp = open("eeprom.bin", O_RDWR | O_CREAT, S_IRWXU | S_IRWXG | S_IRWXO);
+            if (-1 == eeprom_fp)
+            {
+                SF_OSAL_printf("Failed to open! %s" __NL__, strerror(errno));
+            }
+            for (std::size_t idx = 0; idx < NUM_DATA_IDs; idx++)
+            {
+                if (LAYOUT[idx].addr + LAYOUT[idx].len > eeprom_length)
+                {
+                    eeprom_length = LAYOUT[idx].addr + LAYOUT[idx].len;
+                }
+            }
+            if (fallocate(eeprom_fp, 0, 0, eeprom_length))
+            {
+                SF_OSAL_printf("Failed to expand file! %s" __NL__, strerror(errno));
+            }
+            eeprom_mmap = (char *)mmap(
+                nullptr, eeprom_length, PROT_READ | PROT_WRITE, MAP_PRIVATE, eeprom_fp, 0);
+            if (MAP_FAILED == eeprom_mmap)
+            {
+                SF_OSAL_printf("Failed to create mmap! %s" __NL__, strerror(errno));
+            }
+#endif
+        }
+        ~NVRAM()
+        {
+#if SF_PLATFORM == SF_PLATFORM_GLIBC
+            munmap(eeprom_mmap, eeprom_length);
+            close(eeprom_fp);
+#endif
+        }
+        NVRAM(NVRAM const &);
+        void operator=(NVRAM const &);
 };
 #endif