openfirmware: another way to find the MAC address

Of course Sun and Apple didn't put it at the same place...

Change-Id: I974caff7335bb25a0e8dd4f7da8bdb9a737d011e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2357
Reviewed-by: waddlesplash <[email protected]>

src/system/boot/platform/openfirmware/network.cpp

@@ -1,6 +1,7 @@
 /*
  * Copyright 2005, Ingo Weinhold <[email protected]>.
  * Copyright 2010, Andreas Faerber <[email protected]>
+ * Copyright 2002, Adrien Destugues <[email protected]>
  * All rights reserved. Distributed under the terms of the MIT License.
  */
 
@@ -43,6 +44,9 @@ public:
 	virtual ssize_t		Send(const void *buffer, size_t size);
 	virtual ssize_t		Receive(void *buffer, size_t size);
 
+private:
+			status_t	FindMACAddress();
+
 private:
 			intptr_t	fHandle;
 			mac_addr_t	fMACAddress;
@@ -96,6 +100,40 @@ OFEthernetInterface::~OFEthernetInterface()
 }
 
 
+status_t
+OFEthernetInterface::FindMACAddress()
+{
+	intptr_t package = of_instance_to_package(fHandle);
+
+	// get MAC address
+	int bytesRead = of_getprop(package, "local-mac-address", &fMACAddress,
+		sizeof(fMACAddress));
+	if (bytesRead == (int)sizeof(fMACAddress))
+		return B_OK;
+
+	// Failed to get the MAC address of the network device. The system may
+	// have a global standard MAC address.
+	bytesRead = of_getprop(gChosen, "mac-address", &fMACAddress,
+		sizeof(fMACAddress));
+	if (bytesRead == (int)sizeof(fMACAddress)) {
+		return B_OK;
+	}
+
+	// On Sun machines, there is a global word 'mac-address' which returns
+	// the size and a pointer to the MAC address
+	size_t size;
+	void* ptr;
+	if (of_interpret("mac-address", 0, 2, &size, &ptr) != OF_FAILED) {
+		if (size == sizeof(fMACAddress)) {
+			memcpy(&fMACAddress, ptr, size);
+			return B_OK;
+		}
+	}
+
+	return B_ERROR;
+}
+
+
 status_t
 OFEthernetInterface::Init(const char *device, const char *parameters)
 {
@@ -109,21 +147,10 @@ OFEthernetInterface::Init(const char *device, const char *parameters)
 		return B_ERROR;
 	}
 
-	intptr_t package = of_instance_to_package(fHandle);
+	if (FindMACAddress() != B_OK) {
-
-	// get MAC address
-	int bytesRead = of_getprop(package, "local-mac-address", &fMACAddress,
-		sizeof(fMACAddress));
-	if (bytesRead == OF_FAILED || bytesRead < (int)sizeof(fMACAddress)) {
-		// Failed to get the MAC address of the network device. The system may
-		// have a global standard MAC address.
-		bytesRead = of_getprop(gChosen, "mac-address", &fMACAddress,
-			sizeof(fMACAddress));
-		if (bytesRead == OF_FAILED || bytesRead < (int)sizeof(fMACAddress)) {
 		printf("Failed to get MAC address\n");
 		return B_ERROR;
 	}
-	}
 
 	// get IP address