ARM_DRAIN_WRITEBUF(2) BSD/arm System Calls Manual ARM_DRAIN_WRITEBUF(2)NAME
arm_drain_writebuf -- drains the CPU write buffer
LIBRARY
ARM Architecture Library (libarm, -larm)
SYNOPSIS
#include <machine/sysarch.h>
int
arm_drain_writebuf();
DESCRIPTION
arm_drain_writebuf() will make sure that all the entries in the processor write buffer are written out to memory.
Not all processors support this operation (currently only the SA110). Those processes that do not treat this function as a null-op.
ERRORS
arm_drain_writebuf() will never fail so will always return 0.
REFERENCES
StrongARM Data Sheet
BSD March 29, 2002 BSD
Check Out this Related Man Page
I386_GET_MTRR(2) BSD/i386 System Calls Manual I386_GET_MTRR(2)NAME
i386_get_mtrr, i386_set_mtrr -- access Memory Type Range Registers
LIBRARY
i386 Architecture Library (libi386, -li386)
SYNOPSIS
#include <sys/types.h>
#include <machine/sysarch.h>
#include <machine/mtrr.h>
int
i386_get_mtrr(struct mtrr *mtrrp, int *n);
int
i386_set_mtrr(struct mtrr *mtrrp, int *n);
DESCRIPTION
These functions provide an interface to the MTRR registers found on 686-class processors for controlling processor access to memory ranges.
This is most useful for accessing devices such as video accelerators on pci(4) and agp(4) buses. For example, enabling write-combining
allows bus-write transfers to be combined into a larger transfer before bursting over the bus. This can increase performance of write opera-
tions 2.5 times or more.
mtrrp is a pointer to one or more mtrr structures, as described below. The n argument is a pointer to an integer containing the number of
structures pointed to by mtrrp. For i386_set_mtrr() the integer pointed to by n will be updated to reflect the actual number of MTRRs suc-
cessfully set. For i386_get_mtrr() no more than n structures will be copied out, and the integer value pointed to by n will be updated to
reflect the actual number of valid structures retrieved. A NULL argument to mtrrp will result in just the number of MTRRs available being
returned in the integer pointed to by n.
The argument mtrrp has the following structure:
struct mtrr {
uint64_t base;
uint64_t len;
uint8_t type;
int flags;
pid_t owner;
};
The location of the mapping is described by its physical base address base and length len. Valid values for type are:
MTRR_TYPE_UC uncached memory
MTRR_TYPE_WC use write-combining
MTRR_TYPE_WT use write-through caching
MTRR_TYPE_WP write-protected memory
MTRR_TYPE_WB use write-back caching
Valid values for flags are:
MTRR_PRIVATE own range, reset the MTRR when the current process exits
MTRR_FIXED use fixed range MTRR
MTRR_VALID entry is valid
The owner member is the PID of the user process which claims the mapping. It is only valid if MTRR_PRIVATE is set in flags. To clear/reset
MTRRs, use a flags field without MTRR_VALID set.
RETURN VALUES
Upon successful completion zero is returned, otherwise -1 is returned on failure, and the global variable errno is set to indicate the error.
The integer value pointed to by n will contain the number of successfully processed mtrr structures in both cases.
ERRORS
[ENOSYS] The currently running kernel or CPU has no MTRR support.
[EINVAL] The currently running kernel has no MTRR support, or one of the mtrr structures pointed to by mtrrp is invalid.
[EBUSY] No unused MTRRs are available.
HISTORY
The i386_get_mtrr() and i386_set_mtrr() functions appeared in NetBSD 1.6.
BSD November 10, 2001 BSD
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