1 /*
2 * Copyright (c) 2001-2019, Arm Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7
8
9 /************* Include Files ****************/
10 #include <unistd.h>
11 #include <sys/mman.h>
12 #include <fcntl.h>
13 #include "cc_pal_types.h"
14 #include "cc_pal_memmap.h"
15
16 /************************ Defines ******************************/
17 static int halFileH = -1;
18
19 /************************ Enums ******************************/
20
21 /************************ Typedefs ******************************/
22
23 /************************ Global Data ******************************/
24
25 /************************ Private Functions ******************************/
26
27 /************************ Public Functions ******************************/
28
29 /**
30 * @brief This function purpose is to return the base virtual address that maps the
31 * base physical address
32 *
33 * @param[in] physicalAddress - Starts physical address of the I/O range to be mapped.
34 * @param[in] mapSize - Number of bytes that were mapped
35 * @param[out] ppVirtBuffAddr - Pointer to the base virtual address to which the physical pages were mapped
36 *
37 * @return Returns a non-zero value in case of failure
38 */
CC_PalMemMap(CCDmaAddr_t physicalAddress,uint32_t mapSize,uint32_t ** ppVirtBuffAddr)39 uint32_t CC_PalMemMap(CCDmaAddr_t physicalAddress,
40 uint32_t mapSize,
41 uint32_t **ppVirtBuffAddr)
42 {
43 /* Open device file if not already opened */
44 if (halFileH >= 0) { /* already opened */
45 return 0;
46 }
47
48 halFileH = open("/dev/mem", O_RDWR|O_SYNC);
49 if (halFileH < 0) {
50 return 1;
51 }
52 (void)fcntl(halFileH, F_SETFD, FD_CLOEXEC);
53
54 *ppVirtBuffAddr = (uint32_t *)mmap(0, mapSize, PROT_READ|PROT_WRITE, MAP_SHARED, halFileH, physicalAddress);
55 if ((*ppVirtBuffAddr == NULL) || (*ppVirtBuffAddr == MAP_FAILED)) {
56 close(halFileH);
57 halFileH = -1;
58 return 2;
59 }
60 return 0;
61 }/* End of CC_PalMemMap */
62
63
64 /**
65 * @brief This function purpose is to Unmaps a specified address range previously mapped
66 * by CC_PalMemMap
67 *
68 *
69 * @param[in] pVirtBuffAddr - Pointer to the base virtual address to which the physical
70 * pages were mapped
71 * @param[in] mapSize - Number of bytes that were mapped
72 *
73 * @return Returns a non-zero value in case of failure
74 */
CC_PalMemUnMap(uint32_t * pVirtBuffAddr,uint32_t mapSize)75 uint32_t CC_PalMemUnMap(uint32_t *pVirtBuffAddr,
76 uint32_t mapSize)
77 {
78 if (halFileH < 0) {
79 return 1;
80 }
81
82 munmap(pVirtBuffAddr, mapSize);
83 close(halFileH);
84 halFileH = -1;
85 return 0;
86 }/* End of CC_PalMemUnMap */
87
