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Shorten banal comments about zeroing and copying pages. Don't give

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implementation details that last echoed the code 15-20 years ago.
But add a detail about pagezero() on i386.  Switch from Mach style
to BSD style.
This commit is contained in:
Bruce Evans 2016-08-29 14:38:31 +00:00
parent 1a5735873e
commit ef209971e9
2 changed files with 17 additions and 28 deletions
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21
sys/amd64/amd64/pmap.c
View File

@ -5153,8 +5153,7 @@ out:
}
/*
* pmap_zero_page zeros the specified hardware page by mapping
* the page into KVM and using bzero to clear its contents.
* Zero the specified hardware page.
*/
void
pmap_zero_page(vm_page_t m)
@ -5165,10 +5164,8 @@ pmap_zero_page(vm_page_t m)
}
/*
* pmap_zero_page_area zeros the specified hardware page by mapping
* the page into KVM and using bzero to clear its contents.
*
* off and size may not cover an area beyond a single hardware page.
* Zero an an area within a single hardware page. off and size must not
* cover an area beyond a single hardware page.
*/
void
pmap_zero_page_area(vm_page_t m, int off, int size)
@ -5182,10 +5179,9 @@ pmap_zero_page_area(vm_page_t m, int off, int size)
}
/*
* pmap_zero_page_idle zeros the specified hardware page by mapping
* the page into KVM and using bzero to clear its contents. This
* is intended to be called from the vm_pagezero process only and
* outside of Giant.
* Zero the specified hardware page in a way that minimizes cache thrashing.
* This is intended to be called from the vm_pagezero process only and
* outside of Giant.
*/
void
pmap_zero_page_idle(vm_page_t m)
@ -5196,10 +5192,7 @@ pmap_zero_page_idle(vm_page_t m)
}
/*
* pmap_copy_page copies the specified (machine independent)
* page by mapping the page into virtual memory and using
* bcopy to copy the page, one machine dependent page at a
* time.
* Copy 1 specified hardware page to another.
*/
void
pmap_copy_page(vm_page_t msrc, vm_page_t mdst)

24
sys/i386/i386/pmap.c
View File

@ -4174,6 +4174,9 @@ out:
PMAP_UNLOCK(dst_pmap);
}
/*
* Zero 1 page of virtual memory mapped from a hardware page by the caller.
*/
static __inline void
pagezero(void *page)
{
@ -4191,8 +4194,7 @@ pagezero(void *page)
}
/*
* pmap_zero_page zeros the specified hardware page by mapping
* the page into KVM and using bzero to clear its contents.
* Zero the specified hardware page.
*/
void
pmap_zero_page(vm_page_t m)
@ -4214,10 +4216,8 @@ pmap_zero_page(vm_page_t m)
}
/*
* pmap_zero_page_area zeros the specified hardware page by mapping
* the page into KVM and using bzero to clear its contents.
*
* off and size may not cover an area beyond a single hardware page.
* Zero an an area within a single hardware page. off and size must not
* cover an area beyond a single hardware page.
*/
void
pmap_zero_page_area(vm_page_t m, int off, int size)
@ -4242,10 +4242,9 @@ pmap_zero_page_area(vm_page_t m, int off, int size)
}
/*
* pmap_zero_page_idle zeros the specified hardware page by mapping
* the page into KVM and using bzero to clear its contents. This
* is intended to be called from the vm_pagezero process only and
* outside of Giant.
* Zero the specified hardware page in a way that minimizes cache thrashing.
* This is intended to be called from the vm_pagezero process only and
* outside of Giant.
*/
void
pmap_zero_page_idle(vm_page_t m)
@ -4263,10 +4262,7 @@ pmap_zero_page_idle(vm_page_t m)
}
/*
* pmap_copy_page copies the specified (machine independent)
* page by mapping the page into virtual memory and using
* bcopy to copy the page, one machine dependent page at a
* time.
* Copy 1 specified hardware page to another.
*/
void
pmap_copy_page(vm_page_t src, vm_page_t dst)