1 /*************************************************************************/ /*!
3 @Title OS Interface for mapping PMRs into CPU space.
4 @Copyright Copyright (c) Imagination Technologies Ltd. All Rights Reserved
5 @Description OS abstraction for the mmap2 interface for mapping PMRs into
7 @License Dual MIT/GPLv2
9 The contents of this file are subject to the MIT license as set out below.
11 Permission is hereby granted, free of charge, to any person obtaining a copy
12 of this software and associated documentation files (the "Software"), to deal
13 in the Software without restriction, including without limitation the rights
14 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15 copies of the Software, and to permit persons to whom the Software is
16 furnished to do so, subject to the following conditions:
18 The above copyright notice and this permission notice shall be included in
19 all copies or substantial portions of the Software.
21 Alternatively, the contents of this file may be used under the terms of
22 the GNU General Public License Version 2 ("GPL") in which case the provisions
23 of GPL are applicable instead of those above.
25 If you wish to allow use of your version of this file only under the terms of
26 GPL, and not to allow others to use your version of this file under the terms
27 of the MIT license, indicate your decision by deleting the provisions above
28 and replace them with the notice and other provisions required by GPL as set
29 out in the file called "GPL-COPYING" included in this distribution. If you do
30 not delete the provisions above, a recipient may use your version of this file
31 under the terms of either the MIT license or GPL.
33 This License is also included in this distribution in the file called
36 EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
37 PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
38 BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
39 PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR
40 COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
41 IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
42 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
43 */ /**************************************************************************/
48 #include <powervr/mem_types.h>
50 #include "img_types.h"
51 #include "pvrsrv_error.h"
53 /**************************************************************************/ /*!
55 @Description Maps the specified PMR into CPU memory so that it may be
56 accessed by the user process.
57 Whether the memory is mapped read only, read/write, or not at
58 all, is dependent on the PMR itself.
59 The PMR handle is opaque to the user, and lower levels of this
60 stack ensure that the handle is private to this process, such that
61 this API cannot be abused to gain access to other people's PMRs.
62 The OS implementation of this function should return the virtual
63 address and length for the User to use. The "PrivData" is to be
64 stored opaquely by the caller (N.B. he should make no assumptions,
65 in particular, NULL is a valid handle) and given back to the
67 The OS implementation is free to use the PrivData handle for any
69 @Input hBridge The bridge handle.
70 @Input hPMR The handle of the PMR to be mapped.
71 @Input uiPMRLength The size of the PMR.
72 @Input uiFlags Flags indicating how the mapping should
73 be done (read-only, etc). These may not
74 be honoured if the PMR does not permit
76 @Input uiPMRLength The size of the PMR.
77 @Output phOSMMapPrivDataOut Returned private data.
78 @Output ppvMappingAddressOut The returned mapping.
79 @Output puiMappingLengthOut The size of the returned mapping.
80 @Return PVRSRV_OK on success, failure code otherwise.
81 */ /**************************************************************************/
83 OSMMapPMR(IMG_HANDLE hBridge,
85 IMG_DEVMEM_SIZE_T uiPMRLength,
87 IMG_HANDLE *phOSMMapPrivDataOut,
88 void **ppvMappingAddressOut,
89 size_t *puiMappingLengthOut);
91 /**************************************************************************/ /*!
93 @Description Unmaps the specified PMR from CPU memory.
94 This function is the counterpart to OSMMapPMR.
95 The caller is required to pass the PMR handle back in along
96 with the same 3-tuple of information that was returned by the
97 call to OSMMapPMR in phOSMMapPrivDataOut.
98 It is possible to unmap only part of the original mapping
99 with this call, by specifying only the address range to be
100 unmapped in pvMappingAddress and uiMappingLength.
101 @Input hBridge The bridge handle.
102 @Input hPMR The handle of the PMR to be unmapped.
103 @Input hOSMMapPrivData The OS private data of the mapping.
104 @Input pvMappingAddress The address to be unmapped.
105 @Input uiMappingLength The size to be unmapped.
106 @Return PVRSRV_OK on success, failure code otherwise.
107 */ /**************************************************************************/
110 perhaps this function should take _only_ the hOSMMapPrivData arg,
111 and the implementation is required to store any of the other data
112 items that it requires to do the unmap?
115 OSMUnmapPMR(IMG_HANDLE hBridge,
117 IMG_HANDLE hOSMMapPrivData,
118 void *pvMappingAddress,
119 size_t uiMappingLength);
122 #endif /* _OSMMAP_H_ */