add bootpath parser for open firmware

It enables net boot even when there is no bootp/dhcp server.

* grub-core/net/drivers/ieee1275/ofnet.c: Add grub_ieee1275_parse_bootpath and
call it at grub_ieee1275_net_config_real.
* grub-core/kern/ieee1275/init.c: Add bootpath to grub_ieee1275_net_config.
* include/grub/ieee1275/ieee1275.h: Likewise.

ChangeLog

@@ -1,3 +1,16 @@
+2014-02-04  Paulo Flabiano Smorigo  <pfsmorigo@br.ibm.com>
+
+	Add bootpath parser for open firmware.
+
+	It enables net boot even when there is no bootp/dhcp server.
+
+	* grub-core/net/drivers/ieee1275/ofnet.c: Add grub_ieee1275_parse_bootpath
+	and call it at grub_ieee1275_net_config_real.
+	* grub-core/kern/ieee1275/init.c: Add bootpath to
+	grub_ieee1275_net_config.
+	* include/grub/ieee1275/ieee1275.h: Likewise.
+
+
 2014-02-04  Paulo Flabiano Smorigo  <pfsmorigo@br.ibm.com>
 
 	Add grub_env_set_net_property function.

grub-core/kern/ieee1275/init.c

@@ -80,9 +80,8 @@ grub_translate_ieee1275_path (char *filepath)
     }
 }
 
-void (*grub_ieee1275_net_config) (const char *dev,
-				  char **device,
-				  char **path);
+void (*grub_ieee1275_net_config) (const char *dev, char **device, char **path,
+                                  char *bootpath);
 void
 grub_machine_get_bootlocation (char **device, char **path)
 {
@@ -126,7 +125,7 @@ grub_machine_get_bootlocation (char **device, char **path)
       *ptr = 0;
 
       if (grub_ieee1275_net_config)
-	grub_ieee1275_net_config (canon, device, path);
+	grub_ieee1275_net_config (canon, device, path, bootpath);
       grub_free (dev);
       grub_free (canon);
     }

grub-core/net/drivers/ieee1275/ofnet.c

@@ -127,8 +127,111 @@ bootp_response_properties[] =
     { .name = "bootpreply-packet", .offset = 0x2a},
   };
 
+enum
+{
+  BOOTARGS_SERVER_ADDR,
+  BOOTARGS_FILENAME,
+  BOOTARGS_CLIENT_ADDR,
+  BOOTARGS_GATEWAY_ADDR,
+  BOOTARGS_BOOTP_RETRIES,
+  BOOTARGS_TFTP_RETRIES,
+  BOOTARGS_SUBNET_MASK,
+  BOOTARGS_BLOCKSIZE
+};
+
+static int
+grub_ieee1275_parse_bootpath (const char *devpath, char *bootpath,
+                              char **device, struct grub_net_card **card)
+{
+  char *args;
+  char *comma_char = 0;
+  char *equal_char = 0;
+  grub_size_t field_counter = 0;
+
+  grub_net_network_level_address_t client_addr, gateway_addr, subnet_mask;
+  grub_net_link_level_address_t hw_addr;
+  grub_net_interface_flags_t flags = 0;
+  struct grub_net_network_level_interface *inter;
+
+  hw_addr.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
+
+  args = bootpath + grub_strlen (devpath) + 1;
+  do
+    {
+      comma_char = grub_strchr (args, ',');
+      if (comma_char != 0)
+        *comma_char = 0;
+
+      /* Check if it's an option (like speed=auto) and not a default parameter */
+      equal_char = grub_strchr (args, '=');
+      if (equal_char != 0)
+        {
+          *equal_char = 0;
+          grub_env_set_net_property ((*card)->name, args, equal_char + 1,
+                                     grub_strlen(equal_char + 1));
+          *equal_char = '=';
+        }
+      else
+        {
+          switch (field_counter++)
+            {
+            case BOOTARGS_SERVER_ADDR:
+              *device = grub_xasprintf ("tftp,%s", args);
+              if (!*device)
+                return grub_errno;
+              break;
+
+            case BOOTARGS_CLIENT_ADDR:
+              grub_net_resolve_address (args, &client_addr);
+              break;
+
+            case BOOTARGS_GATEWAY_ADDR:
+              grub_net_resolve_address (args, &gateway_addr);
+              break;
+
+            case BOOTARGS_SUBNET_MASK:
+              grub_net_resolve_address (args, &subnet_mask);
+              break;
+            }
+        }
+      args = comma_char + 1;
+      if (comma_char != 0)
+        *comma_char = ',';
+    } while (comma_char != 0);
+
+  if ((client_addr.ipv4 != 0) && (subnet_mask.ipv4 != 0))
+    {
+      grub_ieee1275_phandle_t devhandle;
+      grub_ieee1275_finddevice (devpath, &devhandle);
+      grub_ieee1275_get_property (devhandle, "mac-address",
+                                  hw_addr.mac, sizeof(hw_addr.mac), 0);
+      inter = grub_net_add_addr ((*card)->name, *card, &client_addr, &hw_addr,
+                                 flags);
+      grub_net_add_ipv4_local (inter,
+                          __builtin_ctz (~grub_le_to_cpu32 (subnet_mask.ipv4)));
+    }
+
+  if (gateway_addr.ipv4 != 0)
+    {
+      grub_net_network_level_netaddress_t target;
+      char *rname;
+
+      target.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
+      target.ipv4.base = 0;
+      target.ipv4.masksize = 0;
+      rname = grub_xasprintf ("%s:default", ((*card)->name));
+      if (rname)
+        grub_net_add_route_gw (rname, target, gateway_addr);
+      else
+        return grub_errno;
+    }
+
+  return 0;
+}
+
 static void
-grub_ieee1275_net_config_real (const char *devpath, char **device, char **path)
+grub_ieee1275_net_config_real (const char *devpath, char **device, char **path,
+                               char *bootpath)
 {
   struct grub_net_card *card;
 
@@ -158,6 +261,8 @@ grub_ieee1275_net_config_real (const char *devpath, char **device, char **path)
       }
     grub_free (canon);
 
+    grub_ieee1275_parse_bootpath (devpath, bootpath, device, &card);
+
     for (i = 0; i < ARRAY_SIZE (bootp_response_properties); i++)
       if (grub_ieee1275_get_property_length (grub_ieee1275_chosen,
 					     bootp_response_properties[i].name,

include/grub/ieee1275/ieee1275.h

@@ -71,7 +71,8 @@ struct grub_ieee1275_devalias
 
 extern void (*EXPORT_VAR(grub_ieee1275_net_config)) (const char *dev,
                                                      char **device,
-						     char **path);
+                                                     char **path,
+                                                     char *bootargs);
 
 /* Maps a device alias to a pathname.  */
 extern grub_ieee1275_phandle_t EXPORT_VAR(grub_ieee1275_chosen);