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