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VM: 64-bit mmap()

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Some (backwards-compatible) changes in mmap() call message fields
that allow for a 64-bit offset. minix_mmap() takes an off_t and
minix_mmap64() takes a u64_t. Some mmap() work in VM goes into a
separate function, using the new fields, so that that can be re-used
when files are to be mapped (future commit).

Change-Id: Ifb77a90b593dd3c33cf81b396068e4da1ec5fb1c
This commit is contained in:
Ben Gras
2013-03-20 18:45:10 +00:00
parent 75c5fe4c26
commit 9e88c40e40
4 changed files with 71 additions and 40 deletions
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10
lib/libc/sys-minix/mmap.c
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@@ -2,6 +2,8 @@
#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <minix/u64.h>
#include <minix/vm.h>
/* INCLUDES HERE */
@@ -21,7 +23,7 @@ __weak_alias(minix_munmap, _minix_munmap)
#include <errno.h>
void *minix_mmap_for(endpoint_t forwhom,
void *addr, size_t len, int prot, int flags, int fd, off_t offset)
void *addr, size_t len, int prot, int flags, int fd, u64_t offset)
{
message m;
int r;
@@ -31,11 +33,13 @@ void *minix_mmap_for(endpoint_t forwhom,
m.VMM_PROT = prot;
m.VMM_FLAGS = flags;
m.VMM_FD = fd;
m.VMM_OFFSET = offset;
m.VMM_FORWHOM = forwhom;
m.VMM_OFFSET_LO = ex64lo(offset);
if(forwhom != SELF) {
m.VMM_FLAGS |= MAP_THIRDPARTY;
m.VMM_FORWHOM = forwhom;
} else {
m.VMM_OFFSET_HI = ex64hi(offset);
}
r = _syscall(VM_PROC_NR, VM_MMAP, &m);