From a90dd20702b6bbdc04233a2d8802b4f1986d4fc1 Mon Sep 17 00:00:00 2001
From: Michael Gernoth <michael@gernoth.net>
Date: Mon, 24 May 2010 14:33:38 +0200
Subject: [PATCH] full support for parallel ports on ISE 12

---
 index.html   |  3 +--
 usb-driver.c | 61 +++++++++++++++++++++++++++++++++++++++-------------
 2 files changed, 47 insertions(+), 17 deletions(-)

diff --git a/index.html b/index.html
index b4600d8..35610d6 100644
--- a/index.html
+++ b/index.html
@@ -59,8 +59,7 @@
 			<kbd>sed -i -e 's/TEMPNODE/tempnode/' -e 's/SYSFS/ATTRS/g' -e 's/BUS/SUBSYSTEMS/' /etc/udev/rules.d/xusbdfwu.rules</kbd><BR>
 			You may have to reboot for this change to take effect.</P></LI>
 
-			<LI><P><I>2010-05-22</I>: Support for ISE 12 is now available in the driver, the presence of "windrvr6"
-			is recognized again. Support for parallel/ftdi-cables is currently limited to existing parallel ports only. So you can't use an ftdi-emulated cable on a non-existing parallel port. Using it on a physically present port still works.</P></LI>
+			<LI><P><I>2010-05-22</I>: Support for ISE 12 is now available in the driver.</P></LI>
 		</UL>
 		</P>
 		<H2>Supported Cables</H2>
diff --git a/usb-driver.c b/usb-driver.c
index 252e327..69ee972 100644
--- a/usb-driver.c
+++ b/usb-driver.c
@@ -41,6 +41,7 @@
 #include <bits/wordsize.h>
 #include <sys/ipc.h>
 #include <sys/sem.h>
+#include <sys/mman.h>
 #include <syscall.h>
 #include <linux/personality.h>
 #include "usb-driver.h"
@@ -676,29 +677,59 @@ long int _Z14isModuleLoadedPci(char *module_name, int i) {
 /* XilCommNS::CPortResources::Instance() */
 void* _ZN9XilCommNS14CPortResources8InstanceEv() {
 	static void* (*func) (void) = NULL;
+	static char *NetString = NULL;
+	static char *NetString2 = NULL;
+	char *filename = NULL;
 	void *ret;
 
 	if (!func)
 		func = (void* (*) (void)) dlsym(RTLD_NEXT, "_ZN9XilCommNS14CPortResources8InstanceEv");
 
-	DPRINTF("-> XilCommNS::CPortResources::Instance()\n");
+	if (!NetString)
+		NetString = (char*)dlsym(RTLD_NEXT, "_ZTSN9XilCommNS9NetStringE");
 
-	ret = func();
+	if (!NetString2)
+		NetString2 = (char*)dlsym(RTLD_NEXT, "_ZTIN9XilCommNS9NetStringE");
+	
+	if (NetString && (!strcmp((char*)(NetString+0xb0), "/proc/sys/dev/parport/%s/base-addr")))
+		filename = (char*)(NetString+0xb0);
 
-#ifdef DEBUG
-	hexdump(ret, 0x29, "<-");
-	#if 0
-	{
-		void *portinfo;
-		portinfo = ((unsigned char**)ret+0x00);
-		hexdump(portinfo, 256, "PI");
-		hexdump(portinfo+0x50, 4, "BS");
-		hexdump(portinfo+0x54, 4, "BE");
-		hexdump(portinfo+0x58, 4, "ES");
-		hexdump(portinfo+0x5c, 4, "EE");
+	if (NetString2 && (!strcmp((char*)(NetString2+0xa4), "/proc/sys/dev/parport/%s/base-addr")))
+		filename = (char*)(NetString2+0xa4);
+
+	if (filename) {
+		long pagesize;
+		size_t protectlen;
+		void *start;
+		int len = strlen(filename) + 1;
+		int ret;
+
+		pagesize = sysconf(_SC_PAGE_SIZE);
+		DPRINTF("You have %lu bytes sized pages!\n", pagesize);
+
+		start = (void*)((long)filename & (~(pagesize-1)));
+
+		protectlen = pagesize;
+		if ((long)(filename + len) > (long)(start + protectlen))
+			protectlen += pagesize;
+
+		DPRINTF("Unprotecting %zd bytes starting at %p\n", protectlen, start);
+		ret = mprotect(start, protectlen, PROT_READ|PROT_WRITE);
+		if (ret == -1)
+			perror("mprotect");
+
+		DPRINTF("Replacing %s with /dev/zero\n", filename);
+		strcpy(filename, "/dev/zero");
+
+		DPRINTF("Reprotecting %zd bytes starting at %p\n", protectlen, start);
+		ret = mprotect(start, protectlen, PROT_READ|PROT_EXEC);
+		if (ret == -1)
+			perror("mprotect");
 	}
-	#endif
-#endif
+
+	DPRINTF("-> XilCommNS::CPortResources::Instance()\n");
+
+	ret = func();
 
 	DPRINTF("<- XilCommNS::CPortResources::Instance()\n");
 
-- 
2.39.5