[src/trunk]: src/sys/arch/sparc64 Add a generic ipi to call arbitrary C funct...

[martin <martin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/6bce55e0a6a9
branches:  trunk
changeset: 755243:6bce55e0a6a9
user:      martin <martin%NetBSD.org@localhost>
date:      Sat May 29 21:59:33 2010 +0000

description:
Add a generic ipi to call arbitrary C functions on another (or all other)
cpu(s). Will be used in the near future by some code Mindaugas is working on.

diffstat:

 sys/arch/sparc64/include/cpu.h      |  11 ++++++++++-
 sys/arch/sparc64/sparc64/ipifuncs.c |  34 +++++++++++++++++++++++++++++++---
 sys/arch/sparc64/sparc64/mp_subr.S  |  22 ++++++++++++++++++++--
 3 files changed, 61 insertions(+), 6 deletions(-)

diffs (131 lines):

diff -r 9a08cd04bb38 -r 6bce55e0a6a9 sys/arch/sparc64/include/cpu.h
--- a/sys/arch/sparc64/include/cpu.h    Sat May 29 20:41:58 2010 +0000
+++ b/sys/arch/sparc64/include/cpu.h    Sat May 29 21:59:33 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cpu.h,v 1.91 2010/05/24 09:49:17 martin Exp $ */
+/*     $NetBSD: cpu.h,v 1.92 2010/05/29 21:59:33 martin Exp $ */
 
 /*
  * Copyright (c) 1992, 1993
@@ -247,12 +247,21 @@
  *     multicast - send to everyone in the sparc64_cpuset_t
  *     broadcast - send to to all cpus but ourselves
  *     send - send to just this cpu
+ * The called function do not follow the C ABI, so need to be coded in
+ * assembler.
  */
 typedef void (* ipifunc_t)(void *, void *);
 
 void   sparc64_multicast_ipi(sparc64_cpuset_t, ipifunc_t, uint64_t, uint64_t);
 void   sparc64_broadcast_ipi(ipifunc_t, uint64_t, uint64_t);
 void   sparc64_send_ipi(int, ipifunc_t, uint64_t, uint64_t);
+
+/*
+ * Call an arbitrary C function on another cpu (or all others but ourself)
+ */
+typedef void (*ipi_c_call_func_t)(void*);
+void   sparc64_generic_xcall(struct cpu_info*, ipi_c_call_func_t, void*);
+
 #endif
 
 /*
diff -r 9a08cd04bb38 -r 6bce55e0a6a9 sys/arch/sparc64/sparc64/ipifuncs.c
--- a/sys/arch/sparc64/sparc64/ipifuncs.c       Sat May 29 20:41:58 2010 +0000
+++ b/sys/arch/sparc64/sparc64/ipifuncs.c       Sat May 29 21:59:33 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ipifuncs.c,v 1.37 2010/05/24 09:49:17 martin Exp $ */
+/*     $NetBSD: ipifuncs.c,v 1.38 2010/05/29 21:59:34 martin Exp $ */
 
 /*-
  * Copyright (c) 2004 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ipifuncs.c,v 1.37 2010/05/24 09:49:17 martin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ipifuncs.c,v 1.38 2010/05/29 21:59:34 martin Exp $");
 
 #include "opt_ddb.h"
 
@@ -65,7 +65,7 @@
 
  
 /*
- * These are the "function" entry points in locore.s to handle IPI's.
+ * These are the "function" entry points in locore.s/mp_subr.s to handle IPI's.
  */
 void   sparc64_ipi_halt(void *, void *);
 void   sparc64_ipi_pause(void *, void *);
@@ -74,6 +74,7 @@
 void   sparc64_ipi_dcache_flush_page_us(void *, void *);
 void   sparc64_ipi_dcache_flush_page_usiii(void *, void *);
 void   sparc64_ipi_blast_dcache(void *, void *);
+void   sparc64_ipi_ccall(void *, void *);
 
 /*
  * Process cpu stop-self event.
@@ -461,3 +462,30 @@
 
        printf("\n");
 }
+
+void
+sparc64_generic_xcall(struct cpu_info *target, ipi_c_call_func_t func,
+       void *arg)
+{
+       /* if target == NULL broadcast to everything but curcpu */
+       if (target)
+               sparc64_send_ipi(target->ci_cpuid, sparc64_ipi_ccall,
+                   (uint64_t)(uintptr_t)func, (uint64_t)(uintptr_t)arg);
+       else {
+               
+               sparc64_multicast_ipi(cpus_active, sparc64_ipi_ccall,
+                   (uint64_t)(uintptr_t)func, (uint64_t)(uintptr_t)arg);
+       }
+}
+
+#if 0
+/* XXX: remove once a public prototype is available */
+void   xc_ipi_handler(void);
+void   xc_send_ipi(struct cpu_info *);
+
+void
+xc_send_ipi(struct cpu_info *target)
+{
+       sparc64_generic_xcall(target, (ipi_c_call_func_t)xc_ipi_handler, NULL);
+}
+#endif
diff -r 9a08cd04bb38 -r 6bce55e0a6a9 sys/arch/sparc64/sparc64/mp_subr.S
--- a/sys/arch/sparc64/sparc64/mp_subr.S        Sat May 29 20:41:58 2010 +0000
+++ b/sys/arch/sparc64/sparc64/mp_subr.S        Sat May 29 21:59:33 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: mp_subr.S,v 1.1 2010/05/23 18:49:14 martin Exp $       */
+/*     $NetBSD: mp_subr.S,v 1.2 2010/05/29 21:59:34 martin Exp $       */
 
 /*
  * Copyright (c) 2006-2010 Matthew R. Green
@@ -407,5 +407,23 @@
        membar  #Sync
        ba,a    ret_from_intr_vector
         nop
+
+/*
+ * Setup a C compatible environment and call a MI function.
+ *
+ * On entry:
+ *     %g2 = function to call
+ *     %g3 = single argument to called function
+ */
+ENTRY(sparc64_ipi_ccall)
+       save %sp, -CC64FSZ-16, %sp                      ! create a stack frame
+       stx %g2, [%fp + BIAS -16 + 0]                   ! save function pointer
+       stx %g3, [%fp + BIAS -16 + 8]                   ! and argument
+       wrpr    %g0, PSTATE_KERN, %pstate               ! switch globals
+       ldx [%fp + BIAS -16 + 0], %l0                   ! reload function
+       call %l0                                        ! call function
+        ldx [%fp + BIAS -16 + 8], %o0                  ! reload argument 
+       restore                                         ! pop stack frame
+       ba,a    ret_from_intr_vector                    ! and return from IPI
+        nop
 #endif
-