Messages in this thread |  | | Date | Wed, 20 Sep 2000 12:55:50 -0500 | From | Timur Tabi <> | Subject | Strange virtual/physical address of global data |
| |
I wrote a little module to test virt_to_phys:
unsigned long test_data;
int init_module(void) { void *virt = &test_data; unsigned long phys = virt_to_phys(virt);
When I run this and check the valur of virt and phys, it appears that phys is outside the range of physical memory! That is, if I have 512MB of RAM, then phys is equal to about 520M. However, if I make test_data a local variable:
int init_module(void) { unsigned long test_data; void *virt = &test_data; unsigned long phys = virt_to_phys(virt);
Then I get a number which makes sense (less than 512M)
Could someone explain this to me?
-- Timur Tabi - ttabi@interactivesi.com Interactive Silicon - http://www.interactivesi.com
When replying to a mailing-list message, please don't cc: me, because then I'll just get two copies of the same message. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
|  |