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1.1 root 1: #ifndef LIBRM_H
2: #define LIBRM_H
3:
4: FILE_LICENCE ( GPL2_OR_LATER );
5:
6: /* Segment selectors as used in our protected-mode GDTs.
7: *
8: * Don't change these unless you really know what you're doing.
9: */
10:
11: #define VIRTUAL_CS 0x08
12: #define VIRTUAL_DS 0x10
13: #define PHYSICAL_CS 0x18
14: #define PHYSICAL_DS 0x20
15: #define REAL_CS 0x28
16: #define REAL_DS 0x30
17: #if 0
18: #define LONG_CS 0x38
19: #define LONG_DS 0x40
20: #endif
21:
22: #ifndef ASSEMBLY
23:
24: #ifdef UACCESS_LIBRM
25: #define UACCESS_PREFIX_librm
26: #else
27: #define UACCESS_PREFIX_librm __librm_
28: #endif
29:
30: /* Variables in librm.S */
31: extern unsigned long virt_offset;
32:
33: /**
34: * Convert physical address to user pointer
35: *
36: * @v phys_addr Physical address
37: * @ret userptr User pointer
38: */
39: static inline __always_inline userptr_t
40: UACCESS_INLINE ( librm, phys_to_user ) ( unsigned long phys_addr ) {
41: return ( phys_addr - virt_offset );
42: }
43:
44: /**
45: * Convert user buffer to physical address
46: *
47: * @v userptr User pointer
48: * @v offset Offset from user pointer
49: * @ret phys_addr Physical address
50: */
51: static inline __always_inline unsigned long
52: UACCESS_INLINE ( librm, user_to_phys ) ( userptr_t userptr, off_t offset ) {
53: return ( userptr + offset + virt_offset );
54: }
55:
56: static inline __always_inline userptr_t
57: UACCESS_INLINE ( librm, virt_to_user ) ( volatile const void *addr ) {
58: return trivial_virt_to_user ( addr );
59: }
60:
61: static inline __always_inline void *
62: UACCESS_INLINE ( librm, user_to_virt ) ( userptr_t userptr, off_t offset ) {
63: return trivial_user_to_virt ( userptr, offset );
64: }
65:
66: static inline __always_inline userptr_t
67: UACCESS_INLINE ( librm, userptr_add ) ( userptr_t userptr, off_t offset ) {
68: return trivial_userptr_add ( userptr, offset );
69: }
70:
71: static inline __always_inline void
72: UACCESS_INLINE ( librm, memcpy_user ) ( userptr_t dest, off_t dest_off,
73: userptr_t src, off_t src_off,
74: size_t len ) {
75: trivial_memcpy_user ( dest, dest_off, src, src_off, len );
76: }
77:
78: static inline __always_inline void
79: UACCESS_INLINE ( librm, memmove_user ) ( userptr_t dest, off_t dest_off,
80: userptr_t src, off_t src_off,
81: size_t len ) {
82: trivial_memmove_user ( dest, dest_off, src, src_off, len );
83: }
84:
85: static inline __always_inline void
86: UACCESS_INLINE ( librm, memset_user ) ( userptr_t buffer, off_t offset,
87: int c, size_t len ) {
88: trivial_memset_user ( buffer, offset, c, len );
89: }
90:
91: static inline __always_inline size_t
92: UACCESS_INLINE ( librm, strlen_user ) ( userptr_t buffer, off_t offset ) {
93: return trivial_strlen_user ( buffer, offset );
94: }
95:
96: static inline __always_inline off_t
97: UACCESS_INLINE ( librm, memchr_user ) ( userptr_t buffer, off_t offset,
98: int c, size_t len ) {
99: return trivial_memchr_user ( buffer, offset, c, len );
100: }
101:
102:
103: /******************************************************************************
104: *
105: * Access to variables in .data16 and .text16
106: *
107: */
108:
109: extern char *data16;
110: extern char *text16;
111:
112: #define __data16( variable ) \
113: __attribute__ (( section ( ".data16" ) )) \
114: _data16_ ## variable __asm__ ( #variable )
115:
116: #define __data16_array( variable, array ) \
117: __attribute__ (( section ( ".data16" ) )) \
118: _data16_ ## variable array __asm__ ( #variable )
119:
120: #define __bss16( variable ) \
121: __attribute__ (( section ( ".bss16" ) )) \
122: _data16_ ## variable __asm__ ( #variable )
123:
124: #define __bss16_array( variable, array ) \
125: __attribute__ (( section ( ".bss16" ) )) \
126: _data16_ ## variable array __asm__ ( #variable )
127:
128: #define __text16( variable ) \
129: __attribute__ (( section ( ".text16.data" ) )) \
130: _text16_ ## variable __asm__ ( #variable )
131:
132: #define __text16_array( variable, array ) \
133: __attribute__ (( section ( ".text16.data" ) )) \
134: _text16_ ## variable array __asm__ ( #variable )
135:
136: #define __use_data16( variable ) \
137: ( * ( ( typeof ( _data16_ ## variable ) * ) \
138: & ( data16 [ ( size_t ) & ( _data16_ ## variable ) ] ) ) )
139:
140: #define __use_text16( variable ) \
141: ( * ( ( typeof ( _text16_ ## variable ) * ) \
142: & ( text16 [ ( size_t ) & ( _text16_ ## variable ) ] ) ) )
143:
144: #define __from_data16( pointer ) \
145: ( ( unsigned int ) \
146: ( ( ( void * ) (pointer) ) - ( ( void * ) data16 ) ) )
147:
148: #define __from_text16( pointer ) \
149: ( ( unsigned int ) \
150: ( ( ( void * ) (pointer) ) - ( ( void * ) text16 ) ) )
151:
152: /* Variables in librm.S, present in the normal data segment */
153: extern uint16_t rm_sp;
154: extern uint16_t rm_ss;
155: extern uint16_t __data16 ( rm_cs );
156: #define rm_cs __use_data16 ( rm_cs )
157: extern uint16_t __text16 ( rm_ds );
158: #define rm_ds __use_text16 ( rm_ds )
159:
160: /**
161: * Convert segment:offset address to user buffer
162: *
163: * @v segment Real-mode segment
164: * @v offset Real-mode offset
165: * @ret buffer User buffer
166: */
167: static inline __always_inline userptr_t
168: real_to_user ( unsigned int segment, unsigned int offset ) {
169: return ( phys_to_user ( ( segment << 4 ) + offset ) );
170: }
171:
172: extern uint16_t copy_user_to_rm_stack ( userptr_t data, size_t size );
173: extern void remove_user_from_rm_stack ( userptr_t data, size_t size );
174:
175: /* TEXT16_CODE: declare a fragment of code that resides in .text16 */
176: #define TEXT16_CODE( asm_code_str ) \
177: ".section \".text16\", \"ax\", @progbits\n\t" \
178: ".code16\n\t" \
179: asm_code_str "\n\t" \
180: ".code32\n\t" \
181: ".previous\n\t"
182:
183: /* REAL_CODE: declare a fragment of code that executes in real mode */
184: #define REAL_CODE( asm_code_str ) \
185: "pushl $1f\n\t" \
186: "call real_call\n\t" \
187: "addl $4, %%esp\n\t" \
188: TEXT16_CODE ( "\n1:\n\t" \
189: asm_code_str \
190: "\n\t" \
191: "ret\n\t" )
192:
193: /* PHYS_CODE: declare a fragment of code that executes in flat physical mode */
194: #define PHYS_CODE( asm_code_str ) \
195: "call _virt_to_phys\n\t" \
196: asm_code_str \
197: "call _phys_to_virt\n\t"
198:
199: #endif /* ASSEMBLY */
200:
201: #endif /* LIBRM_H */
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