[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>
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@ -48,6 +48,9 @@
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* behalf of the guest. These mappings are implemented as 256 bit guest
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* supplied bitmaps indexed by plug number. The addresses of the bitmaps
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* are registered with the HV through lv1_configure_irq_state_bitmap().
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* The HV requires that the 512 bits of status + mask not cross a page
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* boundary. PS3_BMP_MINALIGN is used to define this minimal 64 byte
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* alignment.
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*
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* The HV supports 256 plugs per thread, assigned as {0..255}, for a total
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* of 512 plugs supported on a processor. To simplify the logic this
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@ -59,6 +62,8 @@
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* can acquire.
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*/
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#define PS3_BMP_MINALIGN 64
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struct ps3_bmp {
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struct {
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u64 status;
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@ -78,7 +83,7 @@ struct ps3_bmp {
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*/
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struct ps3_private {
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struct ps3_bmp bmp __attribute__ ((aligned (64)));
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struct ps3_bmp bmp __attribute__ ((aligned (PS3_BMP_MINALIGN)));
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u64 node;
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unsigned int cpu;
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};
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