svn commit: r339360 - head/sys/powerpc/powerpc

[Leandro Lupori]

Author: luporl
Date: Mon Oct 15 16:43:07 2018
New Revision: 339360
URL: https://svnweb.freebsd.org/changeset/base/339360

Log:
  Initialize SPRG0 before its first possible use
  
  At early boot, PCPU_GET(), that obtains a pointer from SPRG0, was being
  used with SPRG0 not yet initialized. If it pointed to an invalid
  address, the machine would hang.
  
  Approved by:	re(gjb), jhibbits(mentor)

Modified:
  head/sys/powerpc/powerpc/machdep.c

Modified: head/sys/powerpc/powerpc/machdep.c
==============================================================================
--- head/sys/powerpc/powerpc/machdep.c	Mon Oct 15 10:50:04 2018	(r339359)
+++ head/sys/powerpc/powerpc/machdep.c	Mon Oct 15 16:43:07 2018	(r339360)
@@ -383,12 +383,12 @@ powerpc_init(vm_offset_t fdt, vm_offset_t toc, vm_offs
 	if (platform_smp_get_bsp(&bsp) != 0)
 		bsp.cr_cpuid = 0;
 	pc = &__pcpu[bsp.cr_cpuid];
+	__asm __volatile("mtsprg 0, %0" :: "r"(pc));
 	pcpu_init(pc, bsp.cr_cpuid, sizeof(struct pcpu));
 	pc->pc_curthread = &thread0;
 	thread0.td_oncpu = bsp.cr_cpuid;
 	pc->pc_cpuid = bsp.cr_cpuid;
 	pc->pc_hwref = bsp.cr_hwref;
-	__asm __volatile("mtsprg 0, %0" :: "r"(pc));
 
 	/*
 	 * Init KDB