Remove platform APIs which are not used by any code and which had only stub

implementations or no implementation on all platforms.

Some of these functions might be good ideas, but their semantics were unclear
given the lack of implementation, and an unlucky porter could be fooled into
trying to implement them or, worse, being baffled when something like
platform_trap_enter() failed to be called.

sys/mips/adm5120/adm5120_machdep.c

@@ -115,19 +115,6 @@ mips_init(void)
 #endif
 }
 
-void
-platform_halt(void)
-{
-
-}
-
-
-void
-platform_identify(void)
-{
-
-}
-
 void
 platform_reset(void)
 {
@@ -136,18 +123,6 @@ platform_reset(void)
 	__asm __volatile("j	$25");
 }
 
-void
-platform_trap_enter(void)
-{
-
-}
-
-void
-platform_trap_exit(void)
-{
-
-}
-
 void
 platform_start(__register_t a0 __unused, __register_t a1 __unused, 
     __register_t a2 __unused, __register_t a3 __unused)

sys/mips/alchemy/alchemy_machdep.c

@@ -116,19 +116,6 @@ mips_init(void)
 #endif
 }
 
-void
-platform_halt(void)
-{
-
-}
-
-
-void
-platform_identify(void)
-{
-
-}
-
 void
 platform_reset(void)
 {
@@ -137,18 +124,6 @@ platform_reset(void)
 	__asm __volatile("j	$25");
 }
 
-void
-platform_trap_enter(void)
-{
-
-}
-
-void
-platform_trap_exit(void)
-{
-
-}
-
 void
 platform_start(__register_t a0 __unused, __register_t a1 __unused, 
     __register_t a2 __unused, __register_t a3 __unused)

sys/mips/atheros/ar71xx_machdep.c

@@ -105,18 +105,6 @@ platform_cpu_init()
 	/* Nothing special */
 }
 
-void
-platform_halt(void)
-{
-
-}
-
-void
-platform_identify(void)
-{
-
-}
-
 void
 platform_reset(void)
 {
@@ -126,18 +114,6 @@ platform_reset(void)
 		;
 }
 
-void
-platform_trap_enter(void)
-{
-
-}
-
-void
-platform_trap_exit(void)
-{
-
-}
-
 /*
  * Obtain the MAC address via the Redboot environment.
  */

sys/mips/idt/idt_machdep.c

@@ -81,19 +81,6 @@ platform_cpu_init()
 	/* Nothing special */
 }
 
-void
-platform_halt(void)
-{
-
-}
-
-
-void
-platform_identify(void)
-{
-
-}
-
 void
 platform_reset(void)
 {
@@ -110,18 +97,6 @@ platform_reset(void)
 	__asm __volatile("j	$25");
 }
 
-void
-platform_trap_enter(void)
-{
-
-}
-
-void
-platform_trap_exit(void)
-{
-
-}
-
 void
 platform_start(__register_t a0, __register_t a1,
     __register_t a2 __unused, __register_t a3 __unused)

sys/mips/include/hwfunc.h

@@ -30,14 +30,11 @@
 
 #include <sys/_cpuset.h>
 
-struct trapframe;
 struct timecounter;
-/*
- * Hooks downward into hardware functionality.
- */
 
-void platform_halt(void);
-void platform_intr(struct trapframe *);
+/*
+ * Hooks downward into platform functionality.
+ */
 void platform_reset(void);
 void platform_start(__register_t, __register_t,  __register_t, __register_t);
 
@@ -48,7 +45,6 @@ unsigned platform_get_timecount(struct timecounter *);
 
 /* For hardware specific CPU initialization */
 void platform_cpu_init(void);
-void platform_secondary_init(void);
 
 #ifdef SMP
 
@@ -100,6 +96,6 @@ extern void platform_cpu_mask(cpuset_t *mask);
  */
 struct cpu_group *platform_smp_topo(void);
 
-
 #endif	/* SMP */
+
 #endif /* !_MACHINE_HWFUNC_H_ */

sys/mips/include/md_var.h

@@ -76,9 +76,6 @@ void	mips_pcpu0_init(void);
 void	mips_proc0_init(void);
 void	mips_postboot_fixup(void);
 
-/* Platform call-downs. */
-void	platform_identify(void);
-
 extern int busdma_swi_pending;
 void	busdma_swi(void);
 

sys/mips/include/trap.h

@@ -118,10 +118,4 @@ void MipsUserIntr(void);
 
 register_t trap(struct trapframe *);
 
-#ifndef LOCORE /* XXX */
-int check_address(void *);
-void platform_trap_enter(void);
-void platform_trap_exit(void);
-#endif
-
 #endif /* !_MACHINE_TRAP_H_ */

sys/mips/malta/malta_machdep.c

@@ -199,19 +199,6 @@ mips_init(void)
 #endif
 }
 
-void
-platform_halt(void)
-{
-
-}
-
-
-void
-platform_identify(void)
-{
-
-}
-
 /*
  * Perform a board-level soft-reset.
  * Note that this is not emulated by gxemul.
@@ -225,18 +212,6 @@ platform_reset(void)
 	*c = MALTA_GORESET;
 }
 
-void
-platform_trap_enter(void)
-{
-
-}
-
-void
-platform_trap_exit(void)
-{
-
-}
-
 static uint64_t
 malta_cpu_freq(void)
 {

sys/mips/nlm/xlp_machdep.c

@@ -560,22 +560,6 @@ platform_cpu_init()
 {
 }
 
-void
-platform_identify(void)
-{
-
-	printf("XLP Eval Board\n");
-}
-
-/*
- * XXX Maybe return the state of the watchdog in enter, and pass it to
- * exit?  Like spl().
- */
-void
-platform_trap_enter(void)
-{
-}
-
 void
 platform_reset(void)
 {
@@ -586,11 +570,6 @@ platform_reset(void)
 		__asm __volatile("wait");
 }
 
-void
-platform_trap_exit(void)
-{
-}
-
 #ifdef SMP
 /*
  * XLP threads are started simultaneously when we enable threads, this will

sys/mips/rmi/xlr_machdep.c

@@ -516,19 +516,6 @@ platform_cpu_init()
 {
 }
 
-void
-platform_identify(void)
-{
-
-	printf("Board [%d:%d], processor 0x%08x\n", (int)xlr_boot1_info.board_major_version,
-	    (int)xlr_boot1_info.board_minor_version, mips_rd_prid());
-}
-
-void
-platform_trap_enter(void)
-{
-}
-
 void
 platform_reset(void)
 {
@@ -538,11 +525,6 @@ platform_reset(void)
 	xlr_write_reg(mmio, 8, 1);
 }
 
-void
-platform_trap_exit(void)
-{
-}
-
 #ifdef SMP
 int xlr_ap_release[MAXCPU];
 

sys/mips/rt305x/rt305x_machdep.c

@@ -117,19 +117,6 @@ mips_init(void)
 #endif
 }
 
-void
-platform_halt(void)
-{
-
-}
-
-
-void
-platform_identify(void)
-{
-
-}
-
 void
 platform_reset(void)
 {
@@ -138,18 +125,6 @@ platform_reset(void)
 	__asm __volatile("j	$25");
 }
 
-void
-platform_trap_enter(void)
-{
-
-}
-
-void
-platform_trap_exit(void)
-{
-
-}
-
 void
 platform_start(__register_t a0 __unused, __register_t a1 __unused, 
     __register_t a2 __unused, __register_t a3 __unused)

sys/mips/sentry5/s5_machdep.c

@@ -143,19 +143,6 @@ mips_init(void)
 #endif
 }
 
-void
-platform_halt(void)
-{
-
-}
-
-
-void
-platform_identify(void)
-{
-
-}
-
 void
 platform_reset(void)
 {
@@ -167,18 +154,6 @@ platform_reset(void)
 #endif
 }
 
-void
-platform_trap_enter(void)
-{
-
-}
-
-void
-platform_trap_exit(void)
-{
-
-}
-
 void
 platform_start(__register_t a0, __register_t a1, __register_t a2,
 	       __register_t a3)

sys/mips/sibyte/sb_machdep.c

@@ -271,19 +271,6 @@ mips_init(void)
 #endif
 }
 
-void
-platform_halt(void)
-{
-
-}
-
-
-void
-platform_identify(void)
-{
-
-}
-
 void
 platform_reset(void)
 {
@@ -295,18 +282,6 @@ platform_reset(void)
 	sb_system_reset();
 }
 
-void
-platform_trap_enter(void)
-{
-
-}
-
-void
-platform_trap_exit(void)
-{
-
-}
-
 static void
 kseg0_map_coherent(void)
 {