129 lines
2.4 KiB
C
129 lines
2.4 KiB
C
/*
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* Copyright (c) 2024, Tenstorrent AI ULC
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <errno.h>
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#include <stddef.h>
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#include <sys/types.h>
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#include <kernel_arch_interface.h>
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#include <zephyr/kernel.h>
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#include <zephyr/kernel/mm.h>
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#include <zephyr/sys/fdtable.h>
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#include <zephyr/posix/sys/mman.h>
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#include <zephyr/posix/unistd.h>
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#define _page_size COND_CODE_1(CONFIG_MMU, (CONFIG_MMU_PAGE_SIZE), (PAGE_SIZE))
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int zvfs_ioctl(int fd, int cmd, va_list args);
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static int p2z(int prot, int pflags)
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{
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bool rw = (prot & PROT_WRITE) != 0;
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bool ex = (prot & PROT_EXEC) != 0;
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bool fixed = (pflags & MAP_FIXED) != 0;
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bool shared = (pflags & MAP_SHARED) != 0;
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bool private = (pflags & MAP_PRIVATE) != 0;
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if (!(shared ^ private)) {
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return -1;
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}
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return (rw * K_MEM_PERM_RW) | (ex * K_MEM_PERM_EXEC) | (fixed * K_MEM_DIRECT_MAP);
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}
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static inline int zvfs_ioctl_wrap(int fd, int cmd, ...)
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{
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int ret;
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va_list args;
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va_start(args, cmd);
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ret = zvfs_ioctl(fd, cmd, args);
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va_end(args);
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return ret;
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}
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void *mmap(void *addr, size_t len, int prot, int flags, int fd, off_t off)
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{
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void *virt;
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uintptr_t phys;
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int zflags = p2z(prot, flags);
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if ((len == 0) || (zflags == -1)) {
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errno = EINVAL;
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return MAP_FAILED;
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}
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if ((flags & MAP_ANONYMOUS) != 0) {
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/* force behaviour to be in-line with Linux, fd is ignored */
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fd = -1;
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}
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if (fd > 0) {
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/* non-anonymous mapping */
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virt = NULL;
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if (zvfs_ioctl_wrap(fd, ZFD_IOCTL_MMAP, addr, len, prot, flags, off, &virt) < 0) {
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return MAP_FAILED;
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}
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return virt;
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}
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if (!IS_ENABLED(CONFIG_MMU)) {
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errno = ENOTSUP;
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return MAP_FAILED;
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}
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if ((flags & MAP_FIXED) == 0) {
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/* anonymous mapping */
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virt = k_mem_map(len, zflags);
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} else {
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/* a physical mapping. Care should be taken not to map the same page twice */
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virt = NULL;
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phys = POINTER_TO_UINT(addr);
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k_mem_map_phys_bare((uint8_t **)&virt, phys, (size_t)ROUND_UP(len, _page_size),
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zflags);
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}
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if (virt == NULL) {
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errno = ENOMEM;
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return MAP_FAILED;
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}
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return virt;
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}
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int msync(void *addr, size_t length, int flags)
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{
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ARG_UNUSED(addr);
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ARG_UNUSED(length);
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ARG_UNUSED(flags);
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return 0;
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}
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int munmap(void *addr, size_t len)
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{
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if (len == 0) {
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errno = EINVAL;
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return -1;
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}
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if (!IS_ENABLED(CONFIG_MMU)) {
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/* cannot munmap without an MPU */
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errno = ENOTSUP;
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return -1;
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}
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uintptr_t phys = 0;
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if (arch_page_phys_get(addr, &phys) == 0) {
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k_mem_unmap(addr, ROUND_UP(len, _page_size));
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}
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return 0;
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}
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