[PATCH v5 15/44] x86/boot: introduce boot module interator

["Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>]

Provide an iterator to go through boot module array searching based on type.

Signed-off-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
---
 xen/arch/x86/include/asm/bootinfo.h | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/include/asm/bootinfo.h 
b/xen/arch/x86/include/asm/bootinfo.h
index 2ee0d5ad6d72..c79678840d31 100644
--- a/xen/arch/x86/include/asm/bootinfo.h
+++ b/xen/arch/x86/include/asm/bootinfo.h
@@ -54,8 +54,24 @@ struct boot_info {
     struct boot_module mods[MAX_NR_BOOTMODS + 1];
 };
 
-#endif /* __XEN_X86_BOOTINFO_H__ */
+static inline int __init next_boot_module_index(
+    const struct boot_info *bi, enum bootmod_type t, int offset)
+{
+    int i;
+
+    for ( i = offset; i < bi->nr_modules; i++ )
+    {
+        if ( bi->mods[i].type == t )
+            return i;
+    }
+
+    return -1;
+}
 
+#define first_boot_module_index(bi, t)              \
+    next_boot_module_index(bi, t, 0)
+
+#endif /* __XEN_X86_BOOTINFO_H__ */
 /*
  * Local variables:
  * mode: C
-- 
2.30.2