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Date:   Mon, 11 Dec 2000 23:38:36 -0800
From:   Jun Sun <jsun@mvista.com>
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To:     Ralf Baechle <ralf@oss.sgi.com>
CC:     linux-mips@oss.sgi.com
Subject: Re: Should /dev/kmem support above 0x80000000 area?
References: <3A3051C1.DCFC749B@mvista.com> <20001209003222.A10669@bacchus.dhis.org>
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Ralf Baechle wrote:
> 
> Send me the patch and I'll comment.
> 
>   Ralf

Here is my patch.  I think it should be safe for mips64.  Please double check
it.

Jun
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diff -Nru linux/drivers/char/mem.c.orig linux/drivers/char/mem.c
--- linux/drivers/char/mem.c.orig	Mon Dec 11 22:07:19 2000
+++ linux/drivers/char/mem.c	Mon Dec 11 22:38:11 2000
@@ -258,6 +258,14 @@
 		count -= read;
 	}
 
+#if defined(__mips__)
+        if (KSEGX(p)) {
+		if (copy_to_user(buf, (char*)p, count))
+			return -EFAULT;
+		return count+read;
+	}
+#endif
+
 	kbuf = (char *)__get_free_page(GFP_KERNEL);
 	if (!kbuf)
 		return -ENOMEM;
@@ -288,6 +296,12 @@
 			  size_t count, loff_t *ppos)
 {
 	unsigned long p = *ppos;
+
+#if defined(__mips__)
+        if (KSEGX(p)) {
+		return do_write_mem(file, (void*)p, p, buf, count, ppos);
+	}
+#endif
 
 	if (p >= (unsigned long) high_memory)
 		return 0;

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