From: Patrick Delaunay <patrick.delaunay@foss.st.com>
Date: Fri, 7 May 2021 12:50:33 +0000 (+0200)
Subject: image-fdt: save no-map parameter of reserve-memory
X-Git-Url: http://git.dujemihanovic.xyz/%7B%7B%20%24style.Permalink%20%7D%7D?a=commitdiff_plain;h=f46959cef4360960103d84467b82a56d56152fe4;p=u-boot.git

image-fdt: save no-map parameter of reserve-memory

Save the 'no-map' information present in 'reserved-memory' node to allow
correct handling when the MMU is configured in board to avoid
speculative access.

This binding is defined in
doc/device-tree-bindings/reserved-memory/reserved-memory.txt

Additional properties:
...
no-map (optional) - empty property
    - Indicates the operating system must not create a virtual mapping
      of the region as part of its standard mapping of system memory,
      nor permit speculative access to it under any circumstances other
      than under the control of the device driver using the region.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
---

diff --git a/common/image-fdt.c b/common/image-fdt.c
index d50e1ba3fe..06dce92a28 100644
--- a/common/image-fdt.c
+++ b/common/image-fdt.c
@@ -75,18 +75,20 @@ static const image_header_t *image_get_fdt(ulong fdt_addr)
 #endif
 
 static void boot_fdt_reserve_region(struct lmb *lmb, uint64_t addr,
-				    uint64_t size)
+				    uint64_t size, enum lmb_flags flags)
 {
 	long ret;
 
-	ret = lmb_reserve(lmb, addr, size);
+	ret = lmb_reserve_flags(lmb, addr, size, flags);
 	if (ret >= 0) {
-		debug("   reserving fdt memory region: addr=%llx size=%llx\n",
-		      (unsigned long long)addr, (unsigned long long)size);
+		debug("   reserving fdt memory region: addr=%llx size=%llx flags=%x\n",
+		      (unsigned long long)addr,
+		      (unsigned long long)size, flags);
 	} else {
 		puts("ERROR: reserving fdt memory region failed ");
-		printf("(addr=%llx size=%llx)\n",
-		       (unsigned long long)addr, (unsigned long long)size);
+		printf("(addr=%llx size=%llx flags=%x)\n",
+		       (unsigned long long)addr,
+		       (unsigned long long)size, flags);
 	}
 }
 
@@ -106,6 +108,7 @@ void boot_fdt_add_mem_rsv_regions(struct lmb *lmb, void *fdt_blob)
 	int i, total, ret;
 	int nodeoffset, subnode;
 	struct fdt_resource res;
+	enum lmb_flags flags;
 
 	if (fdt_check_header(fdt_blob) != 0)
 		return;
@@ -115,7 +118,7 @@ void boot_fdt_add_mem_rsv_regions(struct lmb *lmb, void *fdt_blob)
 	for (i = 0; i < total; i++) {
 		if (fdt_get_mem_rsv(fdt_blob, i, &addr, &size) != 0)
 			continue;
-		boot_fdt_reserve_region(lmb, addr, size);
+		boot_fdt_reserve_region(lmb, addr, size, LMB_NONE);
 	}
 
 	/* process reserved-memory */
@@ -127,9 +130,13 @@ void boot_fdt_add_mem_rsv_regions(struct lmb *lmb, void *fdt_blob)
 			ret = fdt_get_resource(fdt_blob, subnode, "reg", 0,
 					       &res);
 			if (!ret && fdtdec_get_is_enabled(fdt_blob, subnode)) {
+				flags = LMB_NONE;
+				if (fdtdec_get_bool(fdt_blob, subnode,
+						    "no-map"))
+					flags = LMB_NOMAP;
 				addr = res.start;
 				size = res.end - res.start + 1;
-				boot_fdt_reserve_region(lmb, addr, size);
+				boot_fdt_reserve_region(lmb, addr, size, flags);
 			}
 
 			subnode = fdt_next_subnode(fdt_blob, subnode);