ADR(9) ADR(9)
NAME
adr - physical address map
SYNOPSIS
cat '#P/adr'
#include "adr.h"
enum {
Anone,
Amemory,
Areserved,
Aacpireclaim,
Aacpinvs,
Aunusable,
Adisable,
Aapic,
Apcibar,
Ammio,
Alast = Ammio,
};
enum {
Mfree,
Mktext,
Mkpage,
Mupage,
Mvmap,
Mlast = Mvmap,
};
uintmem adralloc(uintmem base, uintmem len, int align,
int type, int use, uint flags)
void adrdump(void)
void adrinit(void)
void adrmapck(uintmem base, uintmem len,
int type, int use)
int adrmapenc(uintmem *base, uintmem *len,
int type, int use)
void adrmapinit(uintmem base, uintmem len,
int type, int use)
uint adrmemflags(uintmem pa)
void adrfree(uintmem base, uintmem len)
uintmem adrmemtype(uintmem pa, uintmem *len,
int *type, int *use)
DESCRIPTION
The physical address map is managed by adr. Map entries con-
sist of a base, length address type (e.g. memory, mmio,
etc.), current use and caching flags. The map is
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ADR(9) ADR(9)
initlialized from the *e820 configuration variable (see
plan9.ini(8)), PCI mappings, ACPI and other memory-mapped
devices such as I/O APICs and LAPICs. Address ranges may be
allocated by address type; adr splits address ranges as nec-
essary. Allocated maps are indicated by a non- Mfree value
of use. When maps are freed, they are merged with adjacent
maps of the same address type.
The functions for accessing maps are as follows
adralloc(base, len, align, type, use, flags)
Allocate from existing memory maps with the given
alignment. A matching map must exist and be free, but
will be split to fit the allocation. The memory type
for the range is set to type.
adrdump()
Dump all maps to the console for debugging. (See
#P/adr.)
adrinit()
Set up the address map. This is called early in main.
adrmapinit(base, len, type, use)
Enter a new physical mapping to be entered into the adr
map. The map must not overlap existing maps.
adrmapck(base, len, type, use)
Ensure that the given map exists and is the correct
type. Correct the map if necessary. This is useful to
work around machines that do not reserve memory for I/O
APICs and such.
adrfree(base, len)
Delete the given mapping.
adrmapenc(*base, *len, type, use)
Find the enclosing map, and convert it to the type and
use. Return 0 if successful, and -1 otherwise.
adrmemtype(pa, *len, *type, *use)
Find the enclosing map, and return the base address.
Also return the size, type, and use, if the correspond-
ing pointers are not nil.
adrmemflags(pa)
Return the memory flags for the enclosing region. This
is used by vmap(9nix) to maintain consistent caching
flags.
SOURCE
/sys/src/nix/k10/adr.c
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ADR(9) ADR(9)
SEE ALSO
plan9.ini(8), vmap(9nix).
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