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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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