[PATCH for-7.2 v2 17/20] device_tree.c: support remaining FDT prop types

[Daniel Henrique Barboza]

When printing a blob with 'dtc' using the '-O dts' option there are 3
distinct data types being printed: strings, arrays of uint32s and
regular byte arrays.

Previous patch added support to print strings. Let's add the remaining
formats. We want to resemble the format that 'dtc -O dts' uses, so every
uint32 array uses angle brackets (<>), and regular byte array uses square
brackets ([]). For properties that has no values we keep printing just
its name.

The /chosen FDT node from the pSeris machine gives an example of all
property types 'info fdt' is now able to display:

(qemu) info fdt /chosen
chosen {
    ibm,architecture-vec-5 = [0 0]
    rng-seed = <0x5967a270 0x62b0fb4f 0x8262b46a 0xabf48423 0xcce9615 
0xf9daae64 0x66564790 0x357d1604>
    ibm,arch-vec-5-platform-support = <0x178018c0 0x19001a40>
    linux,pci-probe-only = <0x0>
    stdout-path = '/vdevice/vty@71000000'
    linux,stdout-path = '/vdevice/vty@71000000'
    qemu,graphic-depth = <0x20>
    qemu,graphic-height = <0x258>
    qemu,graphic-width = <0x320>
}

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 softmmu/device_tree.c | 58 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 57 insertions(+), 1 deletion(-)

diff --git a/softmmu/device_tree.c b/softmmu/device_tree.c
index 8691c3ccc0..9d95e4120b 100644
--- a/softmmu/device_tree.c
+++ b/softmmu/device_tree.c
@@ -681,6 +681,53 @@ static bool fdt_prop_is_string(const void *data, int size)
     return true;
 }
 
+static bool fdt_prop_is_uint32_array(int size)
+{
+    return size % 4 == 0;
+}
+
+static void fdt_prop_format_uint32_array(GString *buf,
+                                         const char *propname,
+                                         const void *data,
+                                         int prop_size, int padding)
+{
+    const fdt32_t *array = data;
+    int array_len = prop_size / 4;
+    int i;
+
+    g_string_append_printf(buf, "%*s%s = <", padding, "", propname);
+
+    for (i = 0; i < array_len; i++) {
+        g_string_append_printf(buf, "0x%" PRIx32, fdt32_to_cpu(array[i]));
+
+        if (i < array_len - 1) {
+            g_string_append_printf(buf, " ");
+        }
+    }
+
+    g_string_append_printf(buf, ">\n");
+}
+
+static void fdt_prop_format_val(GString *buf, const char *propname,
+                                const void *data, int prop_size,
+                                int padding)
+{
+    const char *val = data;
+    int i;
+
+    g_string_append_printf(buf, "%*s%s = [", padding, "", propname);
+
+    for (i = 0; i < prop_size; i++) {
+        g_string_append_printf(buf, "%x", val[i]);
+
+        if (i < prop_size - 1) {
+            g_string_append_printf(buf, " ");
+        }
+    }
+
+    g_string_append_printf(buf, "]\n");
+}
+
 static void fdt_format_node(GString *buf, int node, int depth)
 {
     const struct fdt_property *prop = NULL;
@@ -699,11 +746,20 @@ static void fdt_format_node(GString *buf, int node, int 
depth)
         prop = fdt_get_property_by_offset(fdt, property, &prop_size);
         propname = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
 
+        if (prop_size == 0) {
+            g_string_append_printf(buf, "%*s%s;\n", padding, "", propname);
+            continue;
+        }
+
         if (fdt_prop_is_string(prop->data, prop_size)) {
             g_string_append_printf(buf, "%*s%s = '%s'\n",
                                    padding, "", propname, prop->data);
+        } else if (fdt_prop_is_uint32_array(prop_size)) {
+            fdt_prop_format_uint32_array(buf, propname, prop->data, prop_size,
+                                         padding);
         } else {
-            g_string_append_printf(buf, "%*s%s;\n", padding, "", propname);
+            fdt_prop_format_val(buf, propname, prop->data,
+                                prop_size, padding);
         }
     }
 
-- 
2.36.1