harvey/sys/man/9k/physalloc

.TH PHYSALLOC 9
.SH NAME
physalloc, physfree, phystag, physinit, physallocdump \- kernel buddy allocator for physical addresses
.SH SYNOPSIS
.ta \w'\fLuintmem 'u
.de PB
.PP
.ft L
.nf
..
.PB
void	physinit(uintmem pa, u64int size)
.PB
uintmem	physalloc(u64int size, int *colorp, void *tag)
.PB
void*	phystag(uintmem pa)
.PB
void	physfree(uintmem pa, u64int size)
.PB
char*	seprintphysstats(char *s,  char *e)
.SH DESCRIPTION
The kernel contains a buddy allocator to hand out large chunks of
memory outside the kernel heap.  The buddy allocator does not
assign virtual addresses. The map is populated by one or more calls to
.IR physinit .
.I Physalloc
allocates a region of the given color with the given tag.  If the color
is -1, then any memory color may be used, otherwise only memory
of the given color will be allocated.  The
.B tag
is user-defined.  Calls to
.I phystag
map addresses in the allocation back to
.BR tag .
Allocated regions are freed with
.IR physfree .
Stats may be put in a buffer with
.IR seprintstats ,
which takes a pointer to a buffer and its end as
.IR seprint .
.SH SOURCE
.B /sys/src/9k/k10/physalloc.c
.SH "SEE ALSO"
.IR qmalloc (9k),