xen/arm: use defines for boot module indexes instead of open coded numbers

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Julien Grall <julien.grall@linaro.org>

5 files changed, 21 insertions, 16 deletions

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 01492bb177..9ca663a146 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -142,9 +142,9 @@ static int write_properties(struct domain *d, struct kernel_info *kinfo,
     const char *bootargs = NULL;
     int prop;
 
-    if ( early_info.modules.nr_mods >= 1 &&
-         early_info.modules.module[1].cmdline[0] )
-        bootargs = &early_info.modules.module[1].cmdline[0];
+    if ( early_info.modules.nr_mods >= MOD_KERNEL &&
+         early_info.modules.module[MOD_KERNEL].cmdline[0] )
+        bootargs = &early_info.modules.module[MOD_KERNEL].cmdline[0];
 
     for ( prop = fdt_first_property_offset(fdt, node);
           prop >= 0;
diff --git a/xen/arch/arm/kernel.c b/xen/arch/arm/kernel.c
index 141742942c..f12f8959d5 100644
--- a/xen/arch/arm/kernel.c
+++ b/xen/arch/arm/kernel.c
@@ -307,10 +307,10 @@ int kernel_prepare(struct kernel_info *info)
 
     paddr_t start, size;
 
-    if ( early_info.modules.nr_mods > 1 )
+    if ( early_info.modules.nr_mods > MOD_INITRD )
         panic("Cannot handle dom0 initrd yet\n");
 
-    if ( early_info.modules.nr_mods < 1 )
+    if ( early_info.modules.nr_mods < MOD_KERNEL )
     {
         printk("No boot modules found, trying flash\n");
         start = KERNEL_FLASH_ADDRESS;
@@ -319,9 +319,9 @@ int kernel_prepare(struct kernel_info *info)
     }
     else
     {
-        printk("Loading kernel from boot module 1\n");
-        start = early_info.modules.module[1].start;
-        size = early_info.modules.module[1].size;
+        printk("Loading kernel from boot module %d\n", MOD_KERNEL);
+        start = early_info.modules.module[MOD_KERNEL].start;
+        size = early_info.modules.module[MOD_KERNEL].size;
         info->load_attr = BUFFERABLE;
     }
 
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index f8a3d04583..4b31623add 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -152,7 +152,7 @@ void __init discard_initial_modules(void)
     struct dt_module_info *mi = &early_info.modules;
     int i;
 
-    for ( i = 1; i <= mi->nr_mods; i++ )
+    for ( i = MOD_DISCARD_FIRST; i <= mi->nr_mods; i++ )
     {
         paddr_t s = mi->module[i].start;
         paddr_t e = s + PAGE_ALIGN(mi->module[i].size);
@@ -271,9 +271,8 @@ static paddr_t __init get_xen_paddr(void)
     early_printk("Placing Xen at 0x%"PRIpaddr"-0x%"PRIpaddr"\n",
                  paddr, paddr + min_size);
 
-    /* Xen is module 0 */
-    early_info.modules.module[0].start = paddr;
-    early_info.modules.module[0].size = min_size;
+    early_info.modules.module[MOD_XEN].start = paddr;
+    early_info.modules.module[MOD_XEN].size = min_size;
 
     return paddr;
 }
diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index 12499853df..3a3c99cbd7 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -445,9 +445,9 @@ static void __init process_multiboot_node(const void *fdt, int node,
     int len;
 
     if ( fdt_node_check_compatible(fdt, node, "xen,linux-zimage") == 0 )
-        nr = 1;
+        nr = MOD_KERNEL;
     else if ( fdt_node_check_compatible(fdt, node, "xen,linux-initrd") == 0)
-        nr = 2;
+        nr = MOD_INITRD;
     else
         early_panic("%s not a known xen multiboot type\n", name);
 
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index faf727f10b..402cef212c 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -19,7 +19,13 @@
 #define DEVICE_TREE_MAX_DEPTH 16
 
 #define NR_MEM_BANKS 8
-#define NR_MODULES 2
+
+#define MOD_XEN 0
+#define MOD_KERNEL 1
+#define MOD_INITRD 2
+#define NR_MODULES 3
+
+#define MOD_DISCARD_FIRST MOD_KERNEL
 
 struct membank {
     paddr_t start;
@@ -40,7 +46,7 @@ struct dt_mb_module {
 struct dt_module_info {
     int nr_mods;
     /* Module 0 is Xen itself, followed by the provided modules-proper */
-    struct dt_mb_module module[NR_MODULES + 1];
+    struct dt_mb_module module[NR_MODULES];
 };
 
 struct dt_early_info {