Allow DT users to find the initrd if one is passed on the
QEMU command line.
Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx>
---
lib/devicetree.h | 10 ++++++++++
lib/devicetree.c | 34 ++++++++++++++++++++++++++++++++++
2 files changed, 44 insertions(+)
diff --git a/lib/devicetree.h b/lib/devicetree.h
index 9a4d910b6450..93c7ebc63bd8 100644
--- a/lib/devicetree.h
+++ b/lib/devicetree.h
@@ -220,6 +220,16 @@ extern int dt_get_bootargs(const char **bootargs);
extern int dt_get_default_console_node(void);
/*
+ * dt_get_initrd gets the physical address of the initrd and its
+ * size from /chosen
+ * returns
+ * - zero on success
+ * - a negative FDT_ERR_* value on failure, and @initrd will be
+ * set to NULL and @size set to zero
+ */
+extern int dt_get_initrd(const char **initrd, u32 *size);
+
+/*
* dt_get_memory_params gets the memory parameters from the /memory node(s)
* storing each memory region ("address size" tuple) in consecutive entries
* of @regs, up to @nr_regs
diff --git a/lib/devicetree.c b/lib/devicetree.c
index 509649b917cf..2b89178a109b 100644
--- a/lib/devicetree.c
+++ b/lib/devicetree.c
@@ -282,6 +282,40 @@ int dt_get_default_console_node(void)
return fdt_path_offset(fdt, prop->data);
}
+int dt_get_initrd(const char **initrd, u32 *size)
+{
+ const struct fdt_property *prop;
+ const char *start, *end;
+ int node, len;
+ u32 *data;
+
+ *initrd = NULL;
+ *size = 0;
+
+ node = fdt_path_offset(fdt, "/chosen");
+ if (node < 0)
+ return node;
+
+ prop = fdt_get_property(fdt, node, "linux,initrd-start", &len);
+ if (!prop)
+ return len;
+ data = (u32 *)prop->data;
+ start = (const char *)(unsigned long)fdt32_to_cpu(*data);
+
+ prop = fdt_get_property(fdt, node, "linux,initrd-end", &len);
+ if (!prop) {
+ assert(len != -FDT_ERR_NOTFOUND);
+ return len;
+ }
+ data = (u32 *)prop->data;
+ end = (const char *)(unsigned long)fdt32_to_cpu(*data);
+
+ *initrd = start;
+ *size = (unsigned long)end - (unsigned long)start;
+
+ return 0;
+}
+
int dt_init(const void *fdt_ptr)
{
int ret;
--
2.9.3
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