introduced data structure to manage binaries in memory

kernel.c

@@ -1,45 +1,21 @@
 #include "kernel.h"
 #include "ecall.h"
 #include "sched.h"
-#include "mutex.h"
 
 void thread_1();
 
 extern ProcessControlBlock processes[PROCESS_COUNT];
 
+loaded_binary binary_table[NUM_BINARIES];
+
+static int idx = 0;
+
 extern void init()
 {
-    // set up processes
+    for (int i = 0; i < 100; i++) {
-    processes[0].pid = 1;
+        idx += binary_table[i].entrypoint + 4;
-    processes[0].pc = (int) thread_1;
+    }
-    processes[0].regs[2] = 128;
-    processes[0].status = PROC_RDY;
-    processes[0].requested_lock = 0;
-
-    processes[1].pid = 2;
-    processes[1].pc = (int) thread_1;
-    processes[1].regs[2] = 256;
-    processes[1].status = PROC_RDY;
-    processes[1].requested_lock = 0;
 
     scheduler_run_next();   
 }
 
-void thread_1() {
-    int a = 0;  // a4
-    int b = 0;  // a5
-
-    while (true) {
-        a++;
-        if (a > 1000000) {
-            __asm__ __volatile__ (
-                "ebreak"
-            );
-            b++;
-            a = 0;
-        }
-        if (b > 1000000) {
-            b = 0;
-        }
-    }
-}

kernel.h

@@ -5,19 +5,29 @@
 #define false 0
 
 #define XLEN          32            // 32 bit system
-#define MUTEX_COUNT   64            // must be multiple of xlen
+#define PROCESS_COUNT 32            // number of concurrent processes
-#define PROCESS_COUNT 64
+#define NUM_BINARIES  16            // number of binaries loaded simultaneously 
-#define MAX_INT       0x7FFFFFFF    // max 32 bit signed int
-
-// memory layout:
-#define ROM_START 0x00100
-#define IO_START  0x10000
-#define NVM_START 0x20000
-#define RAM_START 0x50000
 
 // scheduler settings
 #define TIME_SLICE_LEN 100          // number of cpu time ticks per slice
 
+
+/* This struct holds information about binaries which are currently loaded into
+ * memory. Currently the kernel is not able to load binaries into memory, as
+ * no file system layer is implemented. When the memory image is built, the 
+ * list of loaded binaries is populated aswell.
+ */
+typedef struct loaded_binary {
+    int binid;
+    int entrypoint;
+    int bounds[2];
+} loaded_binary;
+
+// create a global table holding all loaded binaries.
+// this is either populated at runtime when binaries are loaded dynamically
+// or when a memory image is created.
+extern loaded_binary binary_table[NUM_BINARIES];
+
 // init function
 extern __attribute__((__noreturn__)) void init();