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[POWERPC] ps3: fix interrupt bmp 

Add a comment and a preprocessor macro to help clearify the alignment
needs of the PS3 interrupt bitmap.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Acked-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Geoff Levand 2007-01-26 19:08:16 -08:00 committed by Paul Mackerras
parent b1eeb38e45
commit 577157659f
1 changed files with 6 additions and 1 deletions
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7
arch/powerpc/platforms/ps3/interrupt.c
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@ -48,6 +48,9 @@
* behalf of the guest. These mappings are implemented as 256 bit guest
* supplied bitmaps indexed by plug number. The addresses of the bitmaps
* are registered with the HV through lv1_configure_irq_state_bitmap().
* The HV requires that the 512 bits of status + mask not cross a page
* boundary. PS3_BMP_MINALIGN is used to define this minimal 64 byte
* alignment.
*
* The HV supports 256 plugs per thread, assigned as {0..255}, for a total
* of 512 plugs supported on a processor. To simplify the logic this
@ -59,6 +62,8 @@
* can acquire.
*/
#define PS3_BMP_MINALIGN 64
struct ps3_bmp {
struct {
u64 status;
@ -78,7 +83,7 @@ struct ps3_bmp {
*/
struct ps3_private {
struct ps3_bmp bmp __attribute__ ((aligned (64)));
struct ps3_bmp bmp __attribute__ ((aligned (PS3_BMP_MINALIGN)));
u64 node;
unsigned int cpu;
};