[PATCH] Abstract reset call (and possible 16bit mode switch) into reset() function.

[Kevin O'Connor]

Signed-off-by: Kevin O'Connor 
---
 src/boot.c   |  5 +----
 src/kbd.c    |  2 +-
 src/stacks.c | 10 ++++++++++
 src/stacks.h |  1 +
 src/util.h   |  3 ---
 5 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/src/boot.c b/src/boot.c
index 9be8b2a..5837ad0 100644
--- a/src/boot.c
+++ b/src/boot.c
@@ -689,10 +689,7 @@ boot_fail(void)
         yield_toirq();
     }
     printf("Rebooting.\n");
-    struct bregs br;
-    memset(&br, 0, sizeof(br));
-    br.code = SEGOFF(SEG_BIOS, (u32)reset_vector);
-    farcall16big(&br);
+    reset();
 }

// Determine next boot method and attempt a boot using it.
diff --git a/src/kbd.c b/src/kbd.c
index 33a95a3..3677a12 100644
--- a/src/kbd.c
+++ b/src/kbd.c
@@ -502,7 +502,7 @@ __process_key(u8 scancode)
                 == (KF0_CTRLACTIVE|KF0_ALTACTIVE))) {
             // Ctrl+alt+del - reset machine.
             SET_BDA(soft_reset_flag, 0x1234);
-            reset_vector();
+            reset();
         }
         if (scancode >= ARRAY_SIZE(scan_to_scanascii)) {
             dprintf(1, "KBD: int09h_handler(): unknown scancode read: 0x%02x!\n"
diff --git a/src/stacks.c b/src/stacks.c
index beccc0f..df719fd 100644
--- a/src/stacks.c
+++ b/src/stacks.c
@@ -238,6 +238,16 @@ __call16_int(struct bregs *callregs, u16 offset)
     farcall16(callregs);
 }

+// Reset the machine
+void
+reset(void)
+{
+    extern void reset_vector(void) __noreturn;
+    if (!MODESEGMENT)
+        call16(0, 0, reset_vector);
+    reset_vector();
+}
+

/****************************************************************
  * Threads
diff --git a/src/stacks.h b/src/stacks.h
index d8584f2..22fb943 100644
--- a/src/stacks.h
+++ b/src/stacks.h
@@ -17,6 +17,7 @@ inline void __call16_int(struct bregs *callregs, u16 offset);
         extern void irq_trampoline_ ##nr ();                    \
         __call16_int((callregs), (u32)&irq_trampoline_ ##nr );  \
     } while (0)
+void reset(void);
 extern struct thread_info MainThread;
 struct thread_info *getCurThread(void);
 void yield(void);
diff --git a/src/util.h b/src/util.h
index 8b078e8..ed90e03 100644
--- a/src/util.h
+++ b/src/util.h
@@ -217,9 +217,6 @@ void reloc_preinit(void *f, void *arg);
 // resume.c
 extern int HaveRunPost;

-// romlayout.S
-void reset_vector(void) __noreturn;
-
 // serial.c
 void serial_setup(void);
 void lpt_setup(void);