svn commit: r338538 - head/sys/arm64/arm64

[Mark Johnston]

Author: markj
Date: Sat Sep  8 21:52:44 2018
New Revision: 338538
URL: https://svnweb.freebsd.org/changeset/base/338538

Log:
  Exclude the EFI framebuffer from phys_avail[] on arm64.
  
  On the ThunderX the region occupied by the framebuffer is included in
  the EFI map, so explicitly add it to the set of regions that aren't
  managed by the physical memory allocator.
  
  PR:		231064
  Reviewed by:	andrew
  Approved by:	re (gjb)
  MFC after:	1 week
  Sponsored by:	The FreeBSD Foundation
  Differential Revision:	https://reviews.freebsd.org/D17073

Modified:
  head/sys/arm64/arm64/machdep.c

Modified: head/sys/arm64/arm64/machdep.c
==============================================================================
--- head/sys/arm64/arm64/machdep.c	Sat Sep  8 21:51:47 2018	(r338537)
+++ head/sys/arm64/arm64/machdep.c	Sat Sep  8 21:52:44 2018	(r338538)
@@ -982,6 +982,7 @@ cache_setup(void)
 void
 initarm(struct arm64_bootparams *abp)
 {
+	struct efi_fb *efifb;
 	struct efi_map_header *efihdr;
 	struct pcpu *pcpup;
 	char *env;
@@ -1030,6 +1031,13 @@ initarm(struct arm64_bootparams *abp)
 		arm_physmem_exclude_regions(mem_regions, mem_regions_sz,
 		    EXFLAG_NODUMP | EXFLAG_NOALLOC);
 #endif
+
+	/* Exclude the EFI framebuffer from our view of physical memory. */
+	efifb = (struct efi_fb *)preload_search_info(kmdp,
+	    MODINFO_METADATA | MODINFOMD_EFI_FB);
+	if (efifb != NULL)
+		arm_physmem_exclude_region(efifb->fb_addr, efifb->fb_size,
+		    EXFLAG_NOALLOC);
 
 	/* Set the pcpu data, this is needed by pmap_bootstrap */
 	pcpup = &__pcpu[0];