[coreboot-gerrit] Change in coreboot[master]: lib/bootmem: Add method to walk memory tables

[Patrick Rudolph (Code Review)]

Patrick Rudolph has uploaded this change for review. ( https://review.coreboot.org/25583


Change subject: lib/bootmem: Add method to walk memory tables
......................................................................

lib/bootmem: Add method to walk memory tables

Add a method to walk specified memory tables and call a function
for each memory range.

Merge LB_MEM_RAM_DONT_OVERLAP into LB_MEM_RAM on request, to
ease working with memory regions intended for payloads.

Required for uImage support in coreboot.

Tested on Cavium SoC.

Change-Id: I0004e5ad5fe2289827f370f0d0f9979d3cbd3926
Signed-off-by: Patrick Rudolph <patrick.rudolph at 9elements.com>
---
M src/include/bootmem.h
M src/lib/bootmem.c
2 files changed, 48 insertions(+), 0 deletions(-)



  git pull ssh://review.coreboot.org:29418/coreboot refs/changes/83/25583/1

diff --git a/src/include/bootmem.h b/src/include/bootmem.h
index b825272..b16bcc0 100644
--- a/src/include/bootmem.h
+++ b/src/include/bootmem.h
@@ -41,6 +41,23 @@
 /* Print current range map of boot memory. */
 void bootmem_dump_ranges(void);
 
+typedef bool (*range_action_t)(const struct range_entry *r, void *arg);
+
+/**
+ * Walk memory tables and call the provided function, for every region,
+ * that is bigger than min_size. The caller has to return false to break
+ * out of the loop any time, or return true to continue.
+ *
+ * @param merge_ram_dont_overlap If true, LB_MEM_RAM_DONT_OVERLAP regions
+ *  appear as usable RAM and will never appear in one callback.
+ *  The regions are merged with usable RAM regions.
+ *  If false, all regions are provided as is.
+ * @param action The function to call for each memory range.
+ * @param Pointer passed to function @action. Set to NULL if unused.
+ */
+void bootmem_walk(const bool merge_ram_dont_overlap, range_action_t action,
+		  void *arg);
+
 /* Return 1 if region targets usable RAM, 0 otherwise. */
 int bootmem_region_targets_usable_ram(uint64_t start, uint64_t size);
 
diff --git a/src/lib/bootmem.c b/src/lib/bootmem.c
index f00ce13..f34e773 100644
--- a/src/lib/bootmem.c
+++ b/src/lib/bootmem.c
@@ -133,6 +133,37 @@
 	}
 }
 
+void bootmem_walk(const bool merge_ram_dont_overlap, range_action_t action,
+		  void *arg)
+{
+	const struct range_entry *r;
+	struct memranges *memranges;
+	struct memranges bm;
+
+	assert (action);
+
+	if (merge_ram_dont_overlap) {
+		/**
+		 * Convert LB_MEM_RAM_DONT_OVERLAP to LB_MEM_RAM and merge
+		 * ranges:
+		 * The caller doesn't care about memory used by firmware.
+		 */
+		memranges_clone(&bm, &bootmem);
+		memranges_update_tag(&bm, LB_MEM_RAM_DONT_OVERLAP, LB_MEM_RAM);
+	}
+
+	memranges = merge_ram_dont_overlap ? &bm : &bootmem ;
+
+	memranges_each_entry(r, memranges) {
+		if (!action(r, arg))
+			goto out;
+	}
+
+out:
+	if (merge_ram_dont_overlap)
+		memranges_teardown(&bm);
+}
+
 int bootmem_region_targets_usable_ram(uint64_t start, uint64_t size)
 {
 	const struct range_entry *r;

-- 
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Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I0004e5ad5fe2289827f370f0d0f9979d3cbd3926
Gerrit-Change-Number: 25583
Gerrit-PatchSet: 1
Gerrit-Owner: Patrick Rudolph <patrick.rudolph at 9elements.com>
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