cleaned up scheduling and boot code

kinclude/boot.S

@@ -5,20 +5,8 @@ stack_bottom:
 .space      4096
 stack_top:
 
-
 .section    .text._start
 
-
-// Set up all the CSR mstatus_offsets
-// .set        mstatus,    0x300       // machine status
-// .set        mscratch,   0x340
-// .set        mtvec,      0x305       // machine trap handler
-// .set        mcause,     0x342       // machine trap cause
-// .set        mtval,      0x343       // machine bad address or instruction
-// .set        misa,       0x301       // machine ISA
-// .set        mie,        0x304       // machine interrupt enable
-// .set        mip,        0x344       // machine interrupt pending
-
 .extern     init
 .type       init, @function
 

kinclude/sched.c

@@ -128,12 +128,12 @@ int  scheduler_index_from_pid(int pid)
     return -1;
 }
 
-int  scheduler_create_process(int binid) 
+int* get_current_process_registers() 
 {
-    return 0;
+    return processes[current_process_index].regs;
 }
 
-int* get_current_process_registers() 
+ProcessControlBlock* get_current_process() 
 {
-    return processes[current_process_index].regs;
-}
+    return &processes[current_process_index];
+}

kinclude/sched.h

@@ -3,12 +3,12 @@
 
 #include "../kernel.h"
 
-// process statuses:
-#define PROC_DEAD 0
-#define PROC_RDY  1
-#define PROC_WAIT_LOCK  2
-#define PROC_WAIT_PROC  3
-#define PROC_WAIT_SLEEP 4
+enum process_status {
+    PROC_DEAD       = 0,
+    PROC_RDY        = 1,
+    PROC_WAIT_PROC  = 2,
+    PROC_WAIT_SLEEP = 3,
+}
 
 // process structure:
 typedef struct ProcessControlBlock ProcessControlBlock;
@@ -17,8 +17,7 @@ struct ProcessControlBlock {
     int pc;
     int regs[31];
     // scheduling information
-    int status;
-    int requested_lock;
+    enum process_status status;
     ProcessControlBlock *waiting_for_process;
     unsigned long long int asleep_until;
 };
@@ -33,5 +32,6 @@ void __attribute__((noreturn)) scheduler_run_next();
 void __attribute__((noreturn)) scheduler_switch_to(int proc_index);
 int  scheduler_index_from_pid(int pid);
 int* get_current_process_registers();
+ProcessControlBlock* get_current_process();
 
 #endif