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arm_drain_writebuf(2) [netbsd man page]

ARM_DRAIN_WRITEBUF(2)					    BSD/arm System Calls Manual 				     ARM_DRAIN_WRITEBUF(2)

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

X86_64_GET_MTRR(2)					  BSD/x86_64 System Calls Manual					X86_64_GET_MTRR(2)

x86_64_get_mtrr, x86_64_set_mtrr -- access Memory Type Range Registers LIBRARY
x86_64 Architecture Library (libx86_64, -lx86_64) SYNOPSIS
#include <sys/types.h> #include <machine/sysarch.h> #include <machine/mtrr.h> int x86_64_get_mtrr(struct mtrr *mtrrp, int *n); int x86_64_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 x86_64_set_mtrr() the integer pointed to by n will be updated to reflect the actual number of MTRRs suc- cessfully set. For x86_64_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 x86_64_get_mtrr() and x86_64_set_mtrr() were derived from their i386 counterparts, which appeared in NetBSD 1.6. BSD
November 10, 2001 BSD
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