console input and sbrk

console.c

@@ -207,6 +207,41 @@ consolewrite(struct inode *ip, char *buf, int n)
   return n;
 }
 
+void
+consoleintr(int c)
+{
+  acquire(&cons.lock);
+
+  switch(c){
+  case C('U'):  // Kill line.
+    while(input.e != input.w &&
+          input.buf[(input.e-1) % INPUT_BUF] != '\n'){
+      input.e--;
+      consputc(BACKSPACE);
+    }
+    break;
+  case C('H'): case '\x7f':  // Backspace
+    if(input.e != input.w){
+      input.e--;
+      consputc(BACKSPACE);
+    }
+    break;
+  default:
+    if(c != 0 && input.e-input.r < INPUT_BUF){
+      c = (c == '\r') ? '\n' : c;
+      input.buf[input.e++ % INPUT_BUF] = c;
+      consputc(c);
+      if(c == '\n' || c == C('D') || input.e == input.r+INPUT_BUF){
+        input.w = input.e;
+        wakeup(&input.r);
+      }
+    }
+    break;
+  }
+  
+  release(&cons.lock);
+}
+
 void
 consoleinit(void)
 {

defs.h

@@ -20,7 +20,7 @@ void            bwrite(struct buf*);
 // console.c
 void            consoleinit(void);
 void            printf(char*, ...);
-void            consoleintr(int(*)(void));
+void            consoleintr(int);
 void            panic(char*) __attribute__((noreturn));
 
 // exec.c
@@ -114,7 +114,6 @@ struct cpu*     mycpu(void);
 struct cpu*     getmycpu(void);
 struct proc*    myproc();
 void            procinit(void);
-void            procdump(void);
 void            scheduler(void) __attribute__((noreturn));
 void            sched(void);
 void            setproc(struct proc*);

proc.c

@@ -184,8 +184,6 @@ userinit(void)
   release(&ptable.lock);
 }
 
-#if 0
-
 // Grow current process's memory by n bytes.
 // Return 0 on success, -1 on failure.
 int
@@ -196,17 +194,15 @@ growproc(int n)
 
   sz = p->sz;
   if(n > 0){
-    if((sz = allocuvm(p->pagetable, sz, sz + n)) == 0)
+    if((sz = uvmalloc(p->pagetable, sz, sz + n)) == 0)
       return -1;
   } else if(n < 0){
     if((sz = uvmdealloc(p->pagetable, sz, sz + n)) == 0)
       return -1;
   }
   p->sz = sz;
-  switchuvm(p);
   return 0;
 }
-#endif
 
 // Create a new process, copying p as the parent.
 // Sets up child kernel stack to return as if from system call.
@@ -363,24 +359,7 @@ scheduler(void)
   c->proc = 0;
   for(;;){
     // Enable interrupts on this processor.
-    // XXX riscv
-    //sti();
-
-    if(0){ uint x = * (uint*) 0xc001000;
-      if(x != 0){
-        printf("pending %x\n", x);
-      }
-      x = *(uint*)0xc001004;
-      if(x != 0)
-        printf("pending %x\n", x);
-    }
-
-    if(0){
-      uint uartgetc(void);
-      uint x = uartgetc();
-      if(x != 0)
-        printf("%x ", x);
-    }
+    intr_on();
     
     // Loop over process table looking for process to run.
     acquire(&ptable.lock);
@@ -394,9 +373,7 @@ scheduler(void)
       c->proc = p;
       p->state = RUNNING;
 
-      printf("switch...\n");
       swtch(&c->scheduler, &p->context);
-      printf("switch returned\n");
 
       // Process is done running for now.
       // It should have changed its p->state before coming back.
@@ -450,8 +427,6 @@ forkret(void)
   // Still holding ptable.lock from scheduler.
   release(&ptable.lock);
 
-  printf("entering forkret\n");
-
   if (first) {
     // Some initialization functions must be run in the context
     // of a regular process (e.g., they call sleep), and thus cannot
@@ -550,41 +525,4 @@ kill(int pid)
   return -1;
 }
 
-//PAGEBREAK: 36
-// Print a process listing to console.  For debugging.
-// Runs when user types ^P on console.
-// No lock to avoid wedging a stuck machine further.
-void
-procdump(void)
-{
-  static char *states[] = {
-  [UNUSED]    "unused",
-  [EMBRYO]    "embryo",
-  [SLEEPING]  "sleep ",
-  [RUNNABLE]  "runble",
-  [RUNNING]   "run   ",
-  [ZOMBIE]    "zombie"
-  };
-  int i;
-  struct proc *p;
-  char *state;
-  uint64 pc[10];
-
-  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
-    if(p->state == UNUSED)
-      continue;
-    if(p->state >= 0 && p->state < NELEM(states) && states[p->state])
-      state = states[p->state];
-    else
-      state = "???";
-    printf("%d %s %s", p->pid, state, p->name);
-    if(p->state == SLEEPING){
-      getcallerpcs((uint64*)p->context->rbp+2, pc);
-      for(i=0; i<10 && pc[i] != 0; i++)
-        printf(" %p", pc[i]);
-    }
-    printf("\n");
-  }
-}
-
 #endif

syscall.c

@@ -150,7 +150,7 @@ static int (*syscalls[])(void) = {
 [SYS_chdir]   sys_chdir,
 [SYS_dup]     sys_dup,
 [SYS_getpid]  sys_getpid,
-//[SYS_sbrk]    sys_sbrk,
+[SYS_sbrk]    sys_sbrk,
 //[SYS_sleep]   sys_sleep,
 //[SYS_uptime]  sys_uptime,
 [SYS_open]    sys_open,

sysproc.c

@@ -31,17 +31,6 @@ sys_wait(void)
   return wait();
 }
 
-#if 0
-int
-sys_kill(void)
-{
-  int pid;
-
-  if(argint(0, &pid) < 0)
-    return -1;
-  return kill(pid);
-}
-
 int
 sys_sbrk(void)
 {
@@ -56,6 +45,17 @@ sys_sbrk(void)
   return addr;
 }
 
+#if 0
+int
+sys_kill(void)
+{
+  int pid;
+
+  if(argint(0, &pid) < 0)
+    return -1;
+  return kill(pid);
+}
+
 int
 sys_sleep(void)
 {

uart.c

@@ -52,17 +52,21 @@ uartputc(int c)
 int
 uartgetc(void)
 {
-  if(*(5) & 0x01){
+  if(*R(5) & 0x01){
     // input data is ready.
     return *R(0);
   } else {
     return -1;
-  };
+  }
 }
 
 void
 uartintr(void)
 {
-  int c = uartgetc();
-  printf("%x ", c & 0xff);
+  while(1){
+    int c = uartgetc();
+    if(c == -1)
+      break;
+    consoleintr(c);
+  }
 }