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authorGerald Van Baren <vanbaren@cideas.com>2007-04-14 22:46:41 -0400
committerGerald Van Baren <vanbaren@cideas.com>2007-04-14 22:46:41 -0400
commit3f9f08cf91c8a6949a5d78a18bd3d8df7b86d888 (patch)
tree1b8be22f97b41128b210f98dc0262d606ce56913 /libfdt
parent64dbbd40c58349b64f43fd33dbb5ca0adb67d642 (diff)
downloadblackbird-obmc-uboot-3f9f08cf91c8a6949a5d78a18bd3d8df7b86d888.tar.gz
blackbird-obmc-uboot-3f9f08cf91c8a6949a5d78a18bd3d8df7b86d888.zip
Add some utilities to manipulate the reserved memory map.
Diffstat (limited to 'libfdt')
-rw-r--r--libfdt/fdt_ro.c72
-rw-r--r--libfdt/fdt_wip.c26
2 files changed, 98 insertions, 0 deletions
diff --git a/libfdt/fdt_ro.c b/libfdt/fdt_ro.c
index 2711324870..af33336869 100644
--- a/libfdt/fdt_ro.c
+++ b/libfdt/fdt_ro.c
@@ -329,3 +329,75 @@ uint32_t fdt_next_tag(const void *fdt, int offset, int *nextoffset, char **namep
return tag;
}
+
+/*
+ * Return the number of used reserve map entries and total slots available.
+ */
+int fdt_num_reservemap(void *fdt, int *used, int *total)
+{
+ struct fdt_reserve_entry *re;
+ int start;
+ int end;
+ int err = fdt_check_header(fdt);
+
+ if (err != 0)
+ return err;
+
+ start = fdt_off_mem_rsvmap(fdt);
+
+ /*
+ * Convention is that the reserve map is before the dt_struct,
+ * but it does not have to be.
+ */
+ end = fdt_totalsize(fdt);
+ if (end > fdt_off_dt_struct(fdt))
+ end = fdt_off_dt_struct(fdt);
+ if (end > fdt_off_dt_strings(fdt))
+ end = fdt_off_dt_strings(fdt);
+
+ /*
+ * Since the reserved area list is zero terminated, you get one fewer.
+ */
+ if (total)
+ *total = ((end - start) / sizeof(struct fdt_reserve_entry)) - 1;
+
+ if (used) {
+ *used = 0;
+ while (start < end) {
+ re = (struct fdt_reserve_entry *)(fdt + start);
+ if (re->size == 0)
+ return 0; /* zero size terminates the list */
+
+ *used += 1;
+ start += sizeof(struct fdt_reserve_entry);
+ }
+ /*
+ * If we get here, there was no zero size termination.
+ */
+ return -FDT_ERR_BADLAYOUT;
+ }
+ return 0;
+}
+
+/*
+ * Return the nth reserve map entry.
+ */
+int fdt_get_reservemap(void *fdt, int n, struct fdt_reserve_entry *re)
+{
+ int used;
+ int total;
+ int err;
+
+ err = fdt_num_reservemap(fdt, &used, &total);
+ if (err != 0)
+ return err;
+
+ if (n >= total)
+ return -FDT_ERR_NOSPACE;
+ if (re) {
+ *re = *(struct fdt_reserve_entry *)
+ _fdt_offset_ptr(fdt, n * sizeof(struct fdt_reserve_entry));
+ }
+ return 0;
+}
+
diff --git a/libfdt/fdt_wip.c b/libfdt/fdt_wip.c
index 261b9b0dc9..cf811830a7 100644
--- a/libfdt/fdt_wip.c
+++ b/libfdt/fdt_wip.c
@@ -110,3 +110,29 @@ int fdt_nop_node(void *fdt, int nodeoffset)
nop_region(fdt_offset_ptr(fdt, nodeoffset, 0), endoffset - nodeoffset);
return 0;
}
+
+/*
+ * Replace a reserve map entry in the nth slot.
+ */
+int fdt_replace_reservemap_entry(void *fdt, int n, uint64_t addr, uint64_t size)
+{
+ struct fdt_reserve_entry *re;
+ int used;
+ int total;
+ int err;
+
+ err = fdt_num_reservemap(fdt, &used, &total);
+ if (err != 0)
+ return err;
+
+ if (n >= total)
+ return -FDT_ERR_NOSPACE;
+ re = (struct fdt_reserve_entry *)
+ (fdt + fdt_off_mem_rsvmap(fdt) +
+ (n * sizeof(struct fdt_reserve_entry)));
+ re->address = cpu_to_fdt64(addr);
+ re->size = cpu_to_fdt64(size);
+
+ return 0;
+}
+
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