d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

agp.c:

Browse Source 
Don't use Maxmem when the amount of memory is meant. Use realmem instead.
Maxmem is not only a MD variable, it represents the highest physical memory
address in use. On systems where memory is sparsely layed-out the highest
memory address and the amount of memory are not interchangeable. Scaling the
AGP aperture based on the actual amount of memory (= realmem) rather than
the available memory (= physmem) makes sure there's consistent behaviour
across architectures.

agp_i810.c:
While arguably the use of Maxmem can be considered correct, replace its use
with realmem anyway. agp_i810.c is specific to amd64, i386 & pc98, which
have a dense physical memory layout. Avoiding Maxmem here is done with an
eye on copy-n-paste behaviour in general and to avoid confusion caused by
using realmem in agp.c and Maxmem in agp_i810.c.

In both cases, remove the inclusion of md_var.h
This commit is contained in:
Marcel Moolenaar 2012-07-06 15:57:03 +00:00
parent aaaf515fde
commit e11379e9f8
2 changed files with 2 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
sys/dev/agp/agp.c
View File

@ -55,7 +55,6 @@ __FBSDID("$FreeBSD$");
#include <vm/vm_pageout.h>
#include <vm/pmap.h>
#include <machine/md_var.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
@ -234,7 +233,7 @@ agp_generic_attach(device_t dev)
* Work out an upper bound for agp memory allocation. This
* uses a heurisitc table from the Linux driver.
*/
memsize = ptoa(Maxmem) >> 20;
memsize = ptoa(realmem) >> 20;
for (i = 0; i < agp_max_size; i++) {
if (memsize <= agp_max[i][0])
break;

3
sys/dev/agp/agp_i810.c
View File

@ -74,7 +74,6 @@ __FBSDID("$FreeBSD$");
#include <machine/bus.h>
#include <machine/resource.h>
#include <machine/md_var.h>
#include <sys/rman.h>
MALLOC_DECLARE(M_AGP);
@ -1439,7 +1438,7 @@ agp_i810_attach(device_t dev)
if (error)
return (error);
if (ptoa((vm_paddr_t)Maxmem) >
if (ptoa((vm_paddr_t)realmem) >
(1ULL << sc->match->driver->busdma_addr_mask_sz) - 1) {
device_printf(dev, "agp_i810 does not support physical "
"memory above %ju.\n", (uintmax_t)(1ULL <<