PMAP_MAP(9) | FreeBSD Kernel Developer's Manual | PMAP_MAP(9) |
NAME
pmap_map — map a physical memory range into kernel virtual address (KVA) spaceSYNOPSIS
#include < sys/param.h>#include < vm/vm.h>
#include < vm/pmap.h>
vm_offset_t
pmap_map( vm_offset_t *virt, vm_paddr_t start, vm_paddr_t end, int prot);
DESCRIPTION
The pmap_map() function maps a range of physical addresses into kernel virtual address (KVA) space, from start to end, with protection bits prot.The value passed in *virt is treated as a hint for the virtual address of the beginning of the mapping.
IMPLEMENTATION NOTES
The prot argument is currently ignored by machine-dependent implementations.Architectures which can support a direct mapped physical to virtual region can return the appropriate address within that region, leaving *virt unchanged.
RETURN VALUES
The pmap_map() function returns the virtual address of the beginning of the mapping, if the mapping was successfully made; *virt will also be updated with the first usable address after the mapped region.If the function is unsuccessful, NULL is returned.
SEE ALSO
pmap(9)AUTHORS
This manual page was written by <bms@spc.org>.July 21, 2003 | FreeBSD |