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Bahadir Balban
2008-01-13 13:53:52 +00:00
commit e2b791a3d8
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93
tasks/libposix/mmap.c Normal file
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/*
* Glue logic between posix mmap/munmap functions
* and their L4 implementation.
*
* Copyright (C) 2007 Bahadir Balban
*/
#include <errno.h>
#include <stdio.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <l4lib/arch/syscalls.h>
#include <l4lib/arch/syslib.h>
#include <l4lib/ipcdefs.h>
struct mmap_descriptor {
void *start;
size_t length;
int prot;
int flags;
int fd;
off_t offset;
};
void *mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset)
{
/* Not enough MRs for all arguments, therefore we fill in a structure */
struct mmap_descriptor desc = {
.start = start,
.length = length,
.prot = prot,
.flags = flags,
.fd = fd,
.offset = offset,
};
int err;
write_mr(L4SYS_ARG0, (unsigned long)&desc);
/* Call pager with MMAP request. */
if ((errno = l4_sendrecv(PAGER_TID, PAGER_TID, L4_IPC_TAG_MMAP)) < 0) {
printf("%s: IPC Error: %d.\n", __FUNCTION__, errno);
return MAP_FAILED;
}
/* Check if syscall itself was successful */
if ((errno = l4_get_retval()) < 0) {
printf("%s: MMAP Error: %d.\n", __FUNCTION__, errno);
return MAP_FAILED;
}
return 0;
}
int munmap(void *start, size_t length)
{
write_mr(L4SYS_ARG0, (unsigned long)start);
write_mr(L4SYS_ARG1, length);
/* Call pager with MMAP request. */
if ((errno = l4_sendrecv(PAGER_TID, PAGER_TID, L4_IPC_TAG_MMAP)) < 0) {
printf("%s: IPC Error: %d.\n", __FUNCTION__, errno);
return -1;
}
/* Check if syscall itself was successful */
if ((errno = l4_get_retval()) < 0) {
printf("%s: MUNMAP Error: %d.\n", __FUNCTION__, errno);
return -1;
}
return 0;
}
int l4_msync(void *start, size_t length, int flags)
{
write_mr(L4SYS_ARG0, (unsigned long)start);
write_mr(L4SYS_ARG1, length);
write_mr(L4SYS_ARG2, flags);
/* Call pager with MMAP request. */
if ((errno = l4_sendrecv(PAGER_TID, PAGER_TID, L4_IPC_TAG_MSYNC)) < 0) {
printf("%s: IPC Error: %d.\n", __FUNCTION__, errno);
return -1;
}
/* Check if syscall itself was successful */
if ((errno = l4_get_retval()) < 0) {
printf("%s: MUNMAP Error: %d.\n", __FUNCTION__, errno);
return -1;
}
return 0;
}
int msync(void *start, size_t length, int flags)
{
return l4_msync(start, length, flags);
}