4 FILE_LICENCE ( GPL2_OR_LATER );
6 /* Segment selectors as used in our protected-mode GDTs.
8 * Don't change these unless you really know what you're doing.
11 #define VIRTUAL_CS 0x08
12 #define VIRTUAL_DS 0x10
13 #define PHYSICAL_CS 0x18
14 #define PHYSICAL_DS 0x20
25 #define UACCESS_PREFIX_librm
27 #define UACCESS_PREFIX_librm __librm_
30 /* Variables in librm.S */
31 extern unsigned long virt_offset;
34 * Convert physical address to user pointer
36 * @v phys_addr Physical address
37 * @ret userptr User pointer
39 static inline __always_inline userptr_t
40 UACCESS_INLINE ( librm, phys_to_user ) ( unsigned long phys_addr ) {
41 return ( phys_addr - virt_offset );
45 * Convert user buffer to physical address
47 * @v userptr User pointer
48 * @v offset Offset from user pointer
49 * @ret phys_addr Physical address
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 );
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 );
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 );
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 );
71 static inline __always_inline off_t
72 UACCESS_INLINE ( librm, userptr_sub ) ( userptr_t userptr,
73 userptr_t subtrahend ) {
74 return trivial_userptr_sub ( userptr, subtrahend );
77 static inline __always_inline void
78 UACCESS_INLINE ( librm, memcpy_user ) ( userptr_t dest, off_t dest_off,
79 userptr_t src, off_t src_off,
81 trivial_memcpy_user ( dest, dest_off, src, src_off, len );
84 static inline __always_inline void
85 UACCESS_INLINE ( librm, memmove_user ) ( userptr_t dest, off_t dest_off,
86 userptr_t src, off_t src_off,
88 trivial_memmove_user ( dest, dest_off, src, src_off, len );
91 static inline __always_inline int
92 UACCESS_INLINE ( librm, memcmp_user ) ( userptr_t first, off_t first_off,
93 userptr_t second, off_t second_off,
95 return trivial_memcmp_user ( first, first_off, second, second_off, len);
98 static inline __always_inline void
99 UACCESS_INLINE ( librm, memset_user ) ( userptr_t buffer, off_t offset,
100 int c, size_t len ) {
101 trivial_memset_user ( buffer, offset, c, len );
104 static inline __always_inline size_t
105 UACCESS_INLINE ( librm, strlen_user ) ( userptr_t buffer, off_t offset ) {
106 return trivial_strlen_user ( buffer, offset );
109 static inline __always_inline off_t
110 UACCESS_INLINE ( librm, memchr_user ) ( userptr_t buffer, off_t offset,
111 int c, size_t len ) {
112 return trivial_memchr_user ( buffer, offset, c, len );
116 /******************************************************************************
118 * Access to variables in .data16 and .text16
125 #define __data16( variable ) \
126 __attribute__ (( section ( ".data16" ) )) \
127 _data16_ ## variable __asm__ ( #variable )
129 #define __data16_array( variable, array ) \
130 __attribute__ (( section ( ".data16" ) )) \
131 _data16_ ## variable array __asm__ ( #variable )
133 #define __bss16( variable ) \
134 __attribute__ (( section ( ".bss16" ) )) \
135 _data16_ ## variable __asm__ ( #variable )
137 #define __bss16_array( variable, array ) \
138 __attribute__ (( section ( ".bss16" ) )) \
139 _data16_ ## variable array __asm__ ( #variable )
141 #define __text16( variable ) \
142 __attribute__ (( section ( ".text16.data" ) )) \
143 _text16_ ## variable __asm__ ( #variable )
145 #define __text16_array( variable, array ) \
146 __attribute__ (( section ( ".text16.data" ) )) \
147 _text16_ ## variable array __asm__ ( #variable )
149 #define __use_data16( variable ) \
150 ( * ( ( typeof ( _data16_ ## variable ) * ) \
151 & ( data16 [ ( size_t ) & ( _data16_ ## variable ) ] ) ) )
153 #define __use_text16( variable ) \
154 ( * ( ( typeof ( _text16_ ## variable ) * ) \
155 & ( text16 [ ( size_t ) & ( _text16_ ## variable ) ] ) ) )
157 #define __from_data16( pointer ) \
159 ( ( ( void * ) (pointer) ) - ( ( void * ) data16 ) ) )
161 #define __from_text16( pointer ) \
163 ( ( ( void * ) (pointer) ) - ( ( void * ) text16 ) ) )
165 /* Variables in librm.S, present in the normal data segment */
166 extern uint16_t rm_sp;
167 extern uint16_t rm_ss;
168 extern uint16_t __text16 ( rm_cs );
169 #define rm_cs __use_text16 ( rm_cs )
170 extern uint16_t __text16 ( rm_ds );
171 #define rm_ds __use_text16 ( rm_ds )
174 * Convert segment:offset address to user buffer
176 * @v segment Real-mode segment
177 * @v offset Real-mode offset
178 * @ret buffer User buffer
180 static inline __always_inline userptr_t
181 real_to_user ( unsigned int segment, unsigned int offset ) {
182 return ( phys_to_user ( ( segment << 4 ) + offset ) );
185 extern uint16_t copy_user_to_rm_stack ( userptr_t data, size_t size );
186 extern void remove_user_from_rm_stack ( userptr_t data, size_t size );
188 /* TEXT16_CODE: declare a fragment of code that resides in .text16 */
189 #define TEXT16_CODE( asm_code_str ) \
190 ".section \".text16\", \"ax\", @progbits\n\t" \
192 asm_code_str "\n\t" \
196 /* REAL_CODE: declare a fragment of code that executes in real mode */
197 #define REAL_CODE( asm_code_str ) \
199 "call real_call\n\t" \
200 "addl $4, %%esp\n\t" \
201 TEXT16_CODE ( "\n1:\n\t" \
206 /* PHYS_CODE: declare a fragment of code that executes in flat physical mode */
207 #define PHYS_CODE( asm_code_str ) \
208 "call _virt_to_phys\n\t" \
210 "call _phys_to_virt\n\t"
212 /** Number of interrupts */
215 /** An interrupt descriptor table register */
221 } __attribute__ (( packed ));
223 /** An interrupt descriptor table entry */
224 struct interrupt_descriptor {
225 /** Low 16 bits of address */
231 /** Type and attributes */
233 /** High 16 bits of address */
235 } __attribute__ (( packed ));
237 /** Interrupt descriptor is present */
238 #define IDTE_PRESENT 0x80
240 /** Interrupt descriptor 32-bit interrupt gate type */
241 #define IDTE_TYPE_IRQ32 0x0e
243 /** An interrupt vector
245 * Each interrupt vector comprises an eight-byte fragment of code:
248 * b0 xx movb $INT, %al
249 * e9 xx xx xx xx jmp interrupt_wrapper
251 struct interrupt_vector {
252 /** "pushal" instruction */
254 /** "movb" instruction */
256 /** Interrupt number */
258 /** "jmp" instruction */
260 /** Interrupt wrapper address offset */
262 /** Next instruction after jump */
264 } __attribute__ (( packed ));
266 /** "pushal" instruction */
267 #define PUSHAL_INSN 0x60
269 /** "movb" instruction */
270 #define MOVB_INSN 0xb0
272 /** "jmp" instruction */
273 #define JMP_INSN 0xe9
275 extern void set_interrupt_vector ( unsigned int intr, void *vector );
277 #endif /* ASSEMBLY */