Fixed the kmem driver so that it doesn't assume that physical memory begins

at address 0.

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 8af0fdf..2d5d81f 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -209,6 +209,8 @@ static int mmap_mem(struct file * file, struct vm_area_struct * vma)
 	return 0;
 }
 
+extern unsigned long uml_physmem;
+
 /*
  * This function reads the *virtual* memory as seen by the kernel.
  */
@@ -219,7 +221,8 @@ static ssize_t read_kmem(struct file *file, char *buf,
 	ssize_t read = 0;
 	ssize_t virtr = 0;
 	char * kbuf; /* k-addr because vread() takes vmlist_lock rwlock */
-		
+
+	p += uml_physmem;
 	if (p < (unsigned long) high_memory) {
 		read = count;
 		if (count > (unsigned long) high_memory - p)
@@ -268,7 +271,7 @@ static ssize_t read_kmem(struct file *file, char *buf,
 		}
 		free_page((unsigned long)kbuf);
 	}
- 	*ppos = p;
+ 	*ppos = p - uml_physmem;
  	return virtr + read;
 }