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1.1 root 1: // Code to access multiple segments within gcc.
2: //
3: // Copyright (C) 2008,2009 Kevin O'Connor <[email protected]>
4: //
5: // This file may be distributed under the terms of the GNU LGPLv3 license.
6: #ifndef __FARPTR_H
7: #define __FARPTR_H
8:
9: #include "ioport.h" // insb
10:
11: // Dummy definitions used to make sure gcc understands dependencies
12: // between SET_SEG and GET/READ/WRITE_SEG macros.
13: extern u16 __segment_ES, __segment_CS, __segment_DS, __segment_SS;
14: extern u16 __segment_FS, __segment_GS;
15:
16: // Low level macros for reading/writing memory via a segment selector.
17: #define READ8_SEG(SEG, value, var) \
18: __asm__("addr32 movb %%" #SEG ":%1, %b0" : "=Qi"(value) \
19: : "m"(var), "m"(__segment_ ## SEG))
20: #define READ16_SEG(SEG, value, var) \
21: __asm__("addr32 movw %%" #SEG ":%1, %w0" : "=ri"(value) \
22: : "m"(var), "m"(__segment_ ## SEG))
23: #define READ32_SEG(SEG, value, var) \
24: __asm__("addr32 movl %%" #SEG ":%1, %0" : "=ri"(value) \
25: : "m"(var), "m"(__segment_ ## SEG))
26: #define READ64_SEG(SEG, value, var) do { \
27: union u64_u32_u __value; \
28: union u64_u32_u *__r64_ptr = (union u64_u32_u *)&(var); \
29: READ32_SEG(SEG, __value.hi, __r64_ptr->hi); \
30: READ32_SEG(SEG, __value.lo, __r64_ptr->lo); \
31: *(u64*)&(value) = __value.val; \
32: } while (0)
33: #define WRITE8_SEG(SEG, var, value) \
34: __asm__("addr32 movb %b1, %%" #SEG ":%0" : "=m"(var) \
35: : "Q"(value), "m"(__segment_ ## SEG))
36: #define WRITE16_SEG(SEG, var, value) \
37: __asm__("addr32 movw %w1, %%" #SEG ":%0" : "=m"(var) \
38: : "r"(value), "m"(__segment_ ## SEG))
39: #define WRITE32_SEG(SEG, var, value) \
40: __asm__("addr32 movl %1, %%" #SEG ":%0" : "=m"(var) \
41: : "r"(value), "m"(__segment_ ## SEG))
42: #define WRITE64_SEG(SEG, var, value) do { \
43: union u64_u32_u __value; \
44: union u64_u32_u *__w64_ptr = (union u64_u32_u *)&(var); \
45: typeof(var) __value_tmp = (value); \
46: __value.val = *(u64*)&__value_tmp; \
47: WRITE32_SEG(SEG, __w64_ptr->hi, __value.hi); \
48: WRITE32_SEG(SEG, __w64_ptr->lo, __value.lo); \
49: } while (0)
50:
51: // Low level macros for getting/setting a segment register.
52: #define __SET_SEG(SEG, value) \
53: __asm__("movw %w1, %%" #SEG : "=m"(__segment_ ## SEG) \
54: : "rm"(value))
55: #define __GET_SEG(SEG) ({ \
56: u16 __seg; \
57: __asm__("movw %%" #SEG ", %w0" : "=rm"(__seg) \
58: : "m"(__segment_ ## SEG)); \
59: __seg;})
60:
61: // Macros for automatically choosing the appropriate memory size
62: // access method.
63: extern void __force_link_error__unknown_type();
64:
65: #define __GET_VAR(seg, var) ({ \
66: typeof(var) __val; \
67: if (sizeof(__val) == 1) \
68: READ8_SEG(seg, __val, var); \
69: else if (sizeof(__val) == 2) \
70: READ16_SEG(seg, __val, var); \
71: else if (sizeof(__val) == 4) \
72: READ32_SEG(seg, __val, var); \
73: else if (sizeof(__val) == 8) \
74: READ64_SEG(seg, __val, var); \
75: else \
76: __force_link_error__unknown_type(); \
77: __val; })
78:
79: #define __SET_VAR(seg, var, val) do { \
80: if (sizeof(var) == 1) \
81: WRITE8_SEG(seg, var, (val)); \
82: else if (sizeof(var) == 2) \
83: WRITE16_SEG(seg, var, (val)); \
84: else if (sizeof(var) == 4) \
85: WRITE32_SEG(seg, var, (val)); \
86: else if (sizeof(var) == 8) \
87: WRITE64_SEG(seg, var, (val)); \
88: else \
89: __force_link_error__unknown_type(); \
90: } while (0)
91:
92: // Macros for accessing a variable in another segment. (They
93: // automatically update the %es segment and then make the appropriate
94: // access.)
95: #define __GET_FARVAR(seg, var) ({ \
96: SET_SEG(ES, (seg)); \
97: GET_VAR(ES, (var)); })
98: #define __SET_FARVAR(seg, var, val) do { \
99: typeof(var) __sfv_val = (val); \
100: SET_SEG(ES, (seg)); \
101: SET_VAR(ES, (var), __sfv_val); \
102: } while (0)
103:
104: // Macros for accesssing a 32bit flat mode pointer from 16bit real
105: // mode. (They automatically update the %es segment, break the
106: // pointer into segment/offset, and then make the access.)
107: #define __GET_FLATPTR(ptr) ({ \
108: typeof(&(ptr)) __ptr = &(ptr); \
109: GET_FARVAR(FLATPTR_TO_SEG(__ptr) \
110: , *(typeof(__ptr))FLATPTR_TO_OFFSET(__ptr)); })
111: #define __SET_FLATPTR(ptr, val) do { \
112: typeof (&(ptr)) __ptr = &(ptr); \
113: SET_FARVAR(FLATPTR_TO_SEG(__ptr) \
114: , *(typeof(__ptr))FLATPTR_TO_OFFSET(__ptr) \
115: , (val)); \
116: } while (0)
117:
118: // Macros for converting to/from 32bit flat mode pointers to their
119: // equivalent 16bit segment/offset values.
120: #define FLATPTR_TO_SEG(p) (((u32)(p)) >> 4)
121: #define FLATPTR_TO_OFFSET(p) (((u32)(p)) & 0xf)
122: #define MAKE_FLATPTR(seg,off) ((void*)(((u32)(seg)<<4)+(u32)(off)))
123:
124:
125: #if MODE16 == 1
126:
127: // Definitions when in 16 bit mode.
128: #define GET_FARVAR(seg, var) __GET_FARVAR((seg), (var))
129: #define SET_FARVAR(seg, var, val) __SET_FARVAR((seg), (var), (val))
130: #define GET_VAR(seg, var) __GET_VAR(seg, (var))
131: #define SET_VAR(seg, var, val) __SET_VAR(seg, (var), (val))
132: #define SET_SEG(SEG, value) __SET_SEG(SEG, (value))
133: #define GET_SEG(SEG) __GET_SEG(SEG)
134: #define GET_FLATPTR(ptr) __GET_FLATPTR(ptr)
135: #define SET_FLATPTR(ptr, val) __SET_FLATPTR((ptr), (val))
136:
137: static inline void insb_fl(u16 port, void *ptr_fl, u16 count) {
138: SET_SEG(ES, FLATPTR_TO_SEG(ptr_fl));
139: insb(port, (u8*)FLATPTR_TO_OFFSET(ptr_fl), count);
140: }
141: static inline void insw_fl(u16 port, void *ptr_fl, u16 count) {
142: SET_SEG(ES, FLATPTR_TO_SEG(ptr_fl));
143: insw(port, (u16*)FLATPTR_TO_OFFSET(ptr_fl), count);
144: }
145: static inline void insl_fl(u16 port, void *ptr_fl, u16 count) {
146: SET_SEG(ES, FLATPTR_TO_SEG(ptr_fl));
147: insl(port, (u32*)FLATPTR_TO_OFFSET(ptr_fl), count);
148: }
149: static inline void outsb_fl(u16 port, void *ptr_fl, u16 count) {
150: SET_SEG(ES, FLATPTR_TO_SEG(ptr_fl));
151: outsb(port, (u8*)FLATPTR_TO_OFFSET(ptr_fl), count);
152: }
153: static inline void outsw_fl(u16 port, void *ptr_fl, u16 count) {
154: SET_SEG(ES, FLATPTR_TO_SEG(ptr_fl));
155: outsw(port, (u16*)FLATPTR_TO_OFFSET(ptr_fl), count);
156: }
157: static inline void outsl_fl(u16 port, void *ptr_fl, u16 count) {
158: SET_SEG(ES, FLATPTR_TO_SEG(ptr_fl));
159: outsl(port, (u32*)FLATPTR_TO_OFFSET(ptr_fl), count);
160: }
161:
162: extern void __force_link_error__only_in_32bit() __attribute__ ((noreturn));
163: #define ASSERT16() do { } while (0)
164: #define ASSERT32() __force_link_error__only_in_32bit()
165:
166: #else
167:
168: // In 32-bit mode there is no need to mess with the segments.
169: #define GET_FARVAR(seg, var) \
170: (*((typeof(&(var)))MAKE_FLATPTR((seg), &(var))))
171: #define SET_FARVAR(seg, var, val) \
172: do { GET_FARVAR((seg), (var)) = (val); } while (0)
173: #define GET_VAR(seg, var) (var)
174: #define SET_VAR(seg, var, val) do { (var) = (val); } while (0)
175: #define SET_SEG(SEG, value) ((void)(value))
176: #define GET_SEG(SEG) 0
177: #define GET_FLATPTR(ptr) (ptr)
178: #define SET_FLATPTR(ptr, val) do { (ptr) = (val); } while (0)
179:
180: #define insb_fl(port, ptr_fl, count) insb(port, ptr_fl, count)
181: #define insw_fl(port, ptr_fl, count) insw(port, ptr_fl, count)
182: #define insl_fl(port, ptr_fl, count) insl(port, ptr_fl, count)
183: #define outsb_fl(port, ptr_fl, count) outsb(port, ptr_fl, count)
184: #define outsw_fl(port, ptr_fl, count) outsw(port, ptr_fl, count)
185: #define outsl_fl(port, ptr_fl, count) outsl(port, ptr_fl, count)
186:
187: extern void __force_link_error__only_in_16bit() __attribute__ ((noreturn));
188: #define ASSERT16() __force_link_error__only_in_16bit()
189: #define ASSERT32() do { } while (0)
190:
191: #endif
192:
193: // Definition for common 16bit segment/offset pointers.
194: struct segoff_s {
195: union {
196: struct {
197: u16 offset;
198: u16 seg;
199: };
200: u32 segoff;
201: };
202: };
203: #define SEGOFF(s,o) ({struct segoff_s __so; __so.offset=(o); __so.seg=(s); __so;})
204:
205: static inline struct segoff_s FLATPTR_TO_SEGOFF(void *p) {
206: return SEGOFF(FLATPTR_TO_SEG(p), FLATPTR_TO_OFFSET(p));
207: }
208: static inline void *SEGOFF_TO_FLATPTR(struct segoff_s so) {
209: return MAKE_FLATPTR(so.seg, so.offset);
210: }
211:
212: #endif // farptr.h
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