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https://github.com/drasko/codezero.git
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135 lines
2.9 KiB
C
135 lines
2.9 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/ipcdefs.h>
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#include <libposix.h>
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/* FIXME: Implement the same separation that is in read.c write.c etc. such that
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* l4_syscall returns negative value and then the actual posix glue sets the errno
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* rather than the l4_syscall sets it itself
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*/
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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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static inline void *l4_mmap(void *start, size_t length, int prot, int flags, int fd, off_t pgoffset)
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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 = pgoffset,
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};
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int ret;
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write_mr(L4SYS_ARG0, (unsigned long)&desc);
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/* Call pager with MMAP request. Check ipc error. */
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if ((ret = l4_sendrecv(pagerid, pagerid, L4_IPC_TAG_MMAP)) < 0) {
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print_err("%s: IPC Error: %d.\n", __FUNCTION__, ret);
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return PTR_ERR(ret);
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}
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if (IS_ERR(ret = l4_get_retval()))
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print_err("%s: MMAP Error: %d.\n", __FUNCTION__, ret);
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return (void *)ret;
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}
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void *mmap2(void *start, size_t length, int prot, int flags, int fd, off_t pgoffset)
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{
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void *ret = l4_mmap(start, length, prot, flags, fd, pgoffset);
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if (IS_ERR(ret)) {
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errno = -(int)ret;
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return MAP_FAILED;
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}
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return ret;
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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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return mmap2(start, length, prot, flags, fd, __pfn(offset));
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}
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int l4_munmap(void *start, size_t length)
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{
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int err;
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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 ((err = l4_sendrecv(pagerid, pagerid, L4_IPC_TAG_MUNMAP)) < 0) {
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print_err("%s: IPC Error: %d.\n", __FUNCTION__, err);
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return err;
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}
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/* Check if syscall itself was successful */
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if ((err = l4_get_retval()) < 0) {
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print_err("%s: MUNMAP Error: %d.\n", __FUNCTION__, err);
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return err;
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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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int ret = l4_munmap(start, length);
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/* If error, return positive error code */
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if (ret < 0) {
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errno = -ret;
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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(pagerid, pagerid, L4_IPC_TAG_MSYNC)) < 0) {
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print_err("%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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print_err("%s: MSYNC 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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int ret = l4_msync(start, length, flags);
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if (ret < 0) {
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errno = -ret;
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return -1;
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}
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return 0;
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}
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