target: add function to get number of bytes available in working area

This is a much cleaner solution to the problem of allocating as much
working area as possible than what is currently being done in most/all flash
drivers (which is: try an arbitrary sized chunk, if it fails, pick a smaller
number, rinse and repeat).

Use this function to find out how much working area is available, limit or
restrict that amount at will and then simply allocate it.

Change-Id: Ib7d5d0b7485aed3e0a4fad60c1bedb7dfd16146f
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/446
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

diff --git a/src/target/target.c b/src/target/target.c
index 26607c578259023c3cf87d65f32990019a5447c6..5b37ef03bc22b2ffabdcecae1bc6b90c1059a72c 100644 (file)
--- a/src/target/target.c
+++ b/src/target/target.c
@@ -1502,6 +1502,25 @@ void target_free_all_working_areas(struct target *target)
        target_free_all_working_areas_restore(target, 1);
 }
 
+/* Find the largest number of bytes that can be allocated */
+uint32_t target_get_working_area_avail(struct target *target)
+{
+       struct working_area *c = target->working_areas;
+       uint32_t max_size = 0;
+
+       if (c == NULL)
+               return target->working_area_size;
+
+       while (c) {
+               if (c->free && max_size < c->size)
+                       max_size = c->size;
+
+               c = c->next;
+       }
+
+       return max_size;
+}
+
 int target_arch_state(struct target *target)
 {
        int retval;

diff --git a/src/target/target.h b/src/target/target.h
index 680f8c32b27c3b18a191cdac52578985922bb001..a5ab3bddc7bd7ebe79d9ad698cd3765ba34d9c89 100644 (file)
--- a/src/target/target.h
+++ b/src/target/target.h
@@ -540,6 +540,7 @@ int target_alloc_working_area_try(struct target *target,
                uint32_t size, struct working_area **area);
 int target_free_working_area(struct target *target, struct working_area *area);
 void target_free_all_working_areas(struct target *target);
+uint32_t target_get_working_area_avail(struct target *target);
 
 extern struct target *all_targets;