diff options
Diffstat (limited to 'usr/src/uts/common/vm/vpage.h')
| -rw-r--r-- | usr/src/uts/common/vm/vpage.h | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/usr/src/uts/common/vm/vpage.h b/usr/src/uts/common/vm/vpage.h index 368bc629ff..5eaefb9738 100644 --- a/usr/src/uts/common/vm/vpage.h +++ b/usr/src/uts/common/vm/vpage.h @@ -21,6 +21,7 @@ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. + * Copyright (c) 2015, Joyent, Inc. All rights reserved. */ /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ @@ -39,8 +40,6 @@ #ifndef _VM_VPAGE_H #define _VM_VPAGE_H -#pragma ident "%Z%%M% %I% %E% SMI" - #ifdef __cplusplus extern "C" { #endif @@ -57,9 +56,10 @@ struct vpage { * This was changed from a bitfield to flags/macros in order * to conserve space (uchar_t bitfields are not ANSI). This could * have been condensed to a uchar_t, but at the expense of complexity. - * We've stolen two bits from the top of nvp_advice: the first to store - * pplock, and the second to identify pages for which we have reserved - * swap space, but have not necessarily allocated anon slots. + * We've stolen three bits from the top of nvp_advice: the first to store + * pplock, the second to identify pages for which we have reserved + * swap space, but have not necessarily allocated anon slots, and the third to + * indicate that the page should be zeroed on fork. * * WARNING: VPP_SETADVICE(vpp, x) evaluates vpp twice, and VPP_PLOCK(vpp) * returns a positive integer when the lock is held, not necessarily (1). @@ -69,6 +69,7 @@ struct vpage { #define VP_PPLOCK_SHIFT (0x07) /* offset of lock hiding inside nvp_advice */ #define VP_SWAPRES_MASK (0x40) /* Swap space has been reserved, but we */ /* might not have allocated an anon slot */ +#define VP_INHZERO_MASK (0x20) /* zero page on fork() */ #define VPP_PROT(vpp) ((vpp)->nvp_prot) #define VPP_ADVICE(vpp) ((vpp)->nvp_advice & VP_ADVICE_MASK) @@ -76,6 +77,8 @@ struct vpage { ((uchar_t)((vpp)->nvp_advice & VP_PPLOCK_MASK)) #define VPP_ISSWAPRES(vpp) \ ((uchar_t)((vpp)->nvp_advice & VP_SWAPRES_MASK)) +#define VPP_ISINHZERO(vpp) \ + ((uchar_t)((vpp)->nvp_advice & VP_INHZERO_MASK)) #define VPP_SETPROT(vpp, x) ((vpp)->nvp_prot = (x)) #define VPP_SETADVICE(vpp, x) \ @@ -85,6 +88,8 @@ struct vpage { #define VPP_CLRPPLOCK(vpp) ((vpp)->nvp_advice &= ~VP_PPLOCK_MASK) #define VPP_SETSWAPRES(vpp) ((vpp)->nvp_advice |= VP_SWAPRES_MASK) #define VPP_CLRSWAPRES(vpp) ((vpp)->nvp_advice &= ~VP_SWAPRES_MASK) +#define VPP_SETINHZERO(vpp) ((vpp)->nvp_advice |= VP_INHZERO_MASK) +#define VPP_CLRINHZERO(vpp) ((vpp)->nvp_advice &= ~VP_INHZERO_MASK) #ifdef __cplusplus } |