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author	Olivier Cochard <[email protected]>	2026-11-08 22:25:56 +0000
committer	Olivier Cochard <[email protected]>	2026-11-12 09:41:40 +0000
commit	75734a4b6d0b89820ca17a10991edcea86867102 (patch)
tree	2139e22c48860d13dda9be3ab912ad55c1b23e97
parent	a2adf568cdfe83d8aca49f9eb9ba7891e88ff3cd (diff)

md: Map preloaded images with pmap_mapdev_attr()HEAD main

pmap_map() only works for memory the kernel already maps. A ram disk the loader places in reserved memory may lie outside the direct map, and some platforms have no direct map. Reviewed by: imp Approved by: imp Sponsored by: Netflix Differential Revision: https://ron-dev.freebsd.org/FreeBSD/src/pulls/101

Diffstat

-rw-r--r--

sys/dev/md/md.c

1 files changed, 6 insertions, 1 deletions

diff --git a/sys/dev/md/md.c b/sys/dev/md/md.c
index 5fec3181aaff..f29490d12b85 100644
--- a/sys/dev/md/md.c
+++ b/sys/dev/md/md.c

@@ -2131,7 +2131,12 @@ g_md_init(struct g_class *mp __unused)

(long *) &paddr) != 0 ||

resource_int_value("md", i, "len", &len) != 0)

break;

- ptr = pmap_map(NULL, paddr, paddr + len, VM_PROT_READ);

+ /*

+ * Map the memory into the kernel pmap, if not already present.

+ * Some RamDisks reside in reserved memory without mappings, so

+ * a simple pmap_map() won't always work.

+ */

+ ptr = pmap_mapdev_attr(paddr, len, VM_MEMATTR_DEFAULT);

if (ptr != NULL && len != 0) {

sprintf(scratch, "preload%d 0x%016jx", i,

(uintmax_t)paddr);

generated by cgit v1.3 (git 2.53.0) at 2026-11-12 09:50:48 +0000