The branch main has been updated by royger:
URL:
https://cgit.FreeBSD.org/src/commit/?id=e627e25d761f8a11e9e5881e804fae5793404947
commit e627e25d761f8a11e9e5881e804fae5793404947
Author: Elliott Mitchell <ehem+free...@m5p.com>
AuthorDate: 2021-04-06 09:28:38 +0000
Commit: Roger Pau Monné <roy...@freebsd.org>
CommitDate: 2021-07-28 15:27:03 +0000
xen/xenpv: remove low memory limit for non-x86
For embedded devices reserved addresses will be known in advance. More
recently added devices will also likely be correctly updated. As a
result using any available address is reasonable on non-x86.
Reviewed by: royger
Differential Revision: https://reviews.freebsd.org/D29304
---
sys/dev/xen/bus/xenpv.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/sys/dev/xen/bus/xenpv.c b/sys/dev/xen/bus/xenpv.c
index 080c82c73f08..42f2c88a2885 100644
--- a/sys/dev/xen/bus/xenpv.c
+++ b/sys/dev/xen/bus/xenpv.c
@@ -55,13 +55,17 @@ __FBSDID("$FreeBSD$");
*
* Since this is not possible on i386 just use any available memory
* chunk above 1MB and hope we don't clash with anything else.
+ *
+ * Other architectures better document MMIO regions and drivers more
+ * reliably reserve them. As such, allow using any unpopulated memory
+ * region.
*/
#ifdef __amd64__
#define LOW_MEM_LIMIT 0x100000000ul
#elif defined(__i386__)
#define LOW_MEM_LIMIT 0x100000ul
#else
-#error "Unsupported architecture"
+#define LOW_MEM_LIMIT 0
#endif
static devclass_t xenpv_devclass;
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