[Qemu-devel] [PATCH 3/6] device_tree.c: Format a blob in memory as dts stream and dump to a file.

["john.liuli" <john.liuli@huawei.com>]

From: Li Liu <john.liuli@huawei.com>

The outputed stream format is compatile with
'dtc -I dtb -O dts xxx.dtb'.

Signed-off-by: Li Liu <john.liuli@huawei.com>
---
 device_tree.c |   80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)

diff --git a/device_tree.c b/device_tree.c
index 14d4015..1e407d2 100644
--- a/device_tree.c
+++ b/device_tree.c
@@ -416,3 +416,83 @@ static void dts_write_data(FILE *fp, const char *data, int len)
         fprintf(fp, "]");
     }
 }
+
+static void dts_write_prefix(FILE *fp, int depth)
+{
+    int i;
+
+    for (i = 0; i < depth; i++) {
+        fprintf(fp, "%c", '\t');
+    }
+}
+
+#define PALIGN(p, a) ((void *)(QEMU_ALIGN_UP((unsigned long)(p), (a))))
+#define GET_CELL(p)  (p += 4, *((const uint32_t *)(p - 4)))
+
+static void qemu_write_dts(FILE *fp, void *fdt)
+{
+    const char *p, *name, *data;
+    uint32_t tag;
+    int len, num, depth = 0;
+    int i;
+
+    const char *fdt_struct = (const char *)fdt + fdt_off_dt_struct(fdt);
+    const char *fdt_strings = (const char *)fdt + fdt_off_dt_strings(fdt);
+
+    fprintf(fp, "/dts-v1/;\n");
+
+    num = fdt_num_mem_rsv(fdt);
+    fprintf(fp, "%s", num ? "\n" : "");
+    for (i = 0; i < num; i++) {
+        uint64_t addr, size;
+
+        fdt_get_mem_rsv(fdt, i, &addr, &size);
+        fprintf(fp, "/memreserve/\t0x%016llx 0x%016llx;\n",
+                (unsigned long long)addr, (unsigned long long)size);
+    }
+
+    p = fdt_struct;
+    while ((tag = fdt32_to_cpu(GET_CELL(p))) != FDT_END) {
+        if (tag == FDT_BEGIN_NODE) {
+            name = p;
+            p = PALIGN(p + strlen(name) + 1, 4);
+            if (*name == '\0') {
+                name = "/";
+            }
+
+            fprintf(fp, "\n");
+            dts_write_prefix(fp, depth);
+            fprintf(fp, "%s {\n", name);
+
+            depth++;
+            continue;
+        }
+
+        if (tag == FDT_END_NODE) {
+            depth--;
+
+            dts_write_prefix(fp, depth);
+            fprintf(fp, "};\n");
+            continue;
+        }
+
+        if (tag == FDT_NOP) {
+            continue;
+        }
+
+        if (tag != FDT_PROP) {
+            fprintf(stderr, "FDT: Unknown tag 0x%08x\n", tag);
+            break;
+        }
+
+        len = fdt32_to_cpu(GET_CELL(p));
+        name = fdt_strings + fdt32_to_cpu(GET_CELL(p));
+        data = p;
+        p = PALIGN(p + len, 4);
+
+        dts_write_prefix(fp, depth);
+        fprintf(fp, "%s", name);
+        dts_write_data(fp, data, len);
+        fprintf(fp, ";\n");
+    }
+}
-- 
1.7.9.5