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Diffstat (limited to 'qemu/roms/seabios/src/farptr.h')
| -rw-r--r-- | qemu/roms/seabios/src/farptr.h | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/qemu/roms/seabios/src/farptr.h b/qemu/roms/seabios/src/farptr.h new file mode 100644 index 000000000..0a4db68bf --- /dev/null +++ b/qemu/roms/seabios/src/farptr.h @@ -0,0 +1,208 @@ +// Code to access multiple segments within gcc. +// +// Copyright (C) 2008,2009 Kevin O'Connor <kevin@koconnor.net> +// +// This file may be distributed under the terms of the GNU LGPLv3 license. +#ifndef __FARPTR_H +#define __FARPTR_H + +#include "x86.h" // insb + +// Dummy definitions used to make sure gcc understands dependencies +// between SET_SEG and GET/READ/WRITE_SEG macros. +extern u16 __segment_ES, __segment_CS, __segment_DS, __segment_SS; +extern u16 __segment_FS, __segment_GS; + +// Low level macros for reading/writing memory via a segment selector. +#define READ8_SEG(prefix, SEG, value, var) \ + __asm__(prefix "movb %%" #SEG ":%1, %b0" : "=Qi"(value) \ + : "m"(var), "m"(__segment_ ## SEG)) +#define READ16_SEG(prefix, SEG, value, var) \ + __asm__(prefix "movw %%" #SEG ":%1, %w0" : "=ri"(value) \ + : "m"(var), "m"(__segment_ ## SEG)) +#define READ32_SEG(prefix, SEG, value, var) \ + __asm__(prefix "movl %%" #SEG ":%1, %0" : "=ri"(value) \ + : "m"(var), "m"(__segment_ ## SEG)) +#define READ64_SEG(prefix, SEG, value, var) do { \ + union u64_u32_u __value; \ + union u64_u32_u *__r64_ptr = (union u64_u32_u *)&(var); \ + READ32_SEG(prefix, SEG, __value.lo, __r64_ptr->lo); \ + READ32_SEG(prefix, SEG, __value.hi, __r64_ptr->hi); \ + *(u64*)&(value) = __value.val; \ + } while (0) +#define WRITE8_SEG(prefix, SEG, var, value) \ + __asm__(prefix "movb %b1, %%" #SEG ":%0" : "=m"(var) \ + : "Q"(value), "m"(__segment_ ## SEG)) +#define WRITE16_SEG(prefix, SEG, var, value) \ + __asm__(prefix "movw %w1, %%" #SEG ":%0" : "=m"(var) \ + : "r"(value), "m"(__segment_ ## SEG)) +#define WRITE32_SEG(prefix, SEG, var, value) \ + __asm__(prefix "movl %1, %%" #SEG ":%0" : "=m"(var) \ + : "r"(value), "m"(__segment_ ## SEG)) +#define WRITE64_SEG(prefix, SEG, var, value) do { \ + union u64_u32_u __value; \ + union u64_u32_u *__w64_ptr = (union u64_u32_u *)&(var); \ + typeof(var) __value_tmp = (value); \ + __value.val = *(u64*)&__value_tmp; \ + WRITE32_SEG(prefix, SEG, __w64_ptr->lo, __value.lo); \ + WRITE32_SEG(prefix, SEG, __w64_ptr->hi, __value.hi); \ + } while (0) + +// Macros for automatically choosing the appropriate memory size +// access method. +extern void __force_link_error__unknown_type(void); + +#define __GET_VAR(prefix, seg, var) ({ \ + typeof(var) __val; \ + if (sizeof(__val) == 1) \ + READ8_SEG(prefix, seg, __val, var); \ + else if (sizeof(__val) == 2) \ + READ16_SEG(prefix, seg, __val, var); \ + else if (sizeof(__val) == 4) \ + READ32_SEG(prefix, seg, __val, var); \ + else if (sizeof(__val) == 8) \ + READ64_SEG(prefix, seg, __val, var); \ + else \ + __force_link_error__unknown_type(); \ + __val; }) + +#define __SET_VAR(prefix, seg, var, val) do { \ + if (sizeof(var) == 1) \ + WRITE8_SEG(prefix, seg, var, (val)); \ + else if (sizeof(var) == 2) \ + WRITE16_SEG(prefix, seg, var, (val)); \ + else if (sizeof(var) == 4) \ + WRITE32_SEG(prefix, seg, var, (val)); \ + else if (sizeof(var) == 8) \ + WRITE64_SEG(prefix, seg, var, (val)); \ + else \ + __force_link_error__unknown_type(); \ + } while (0) + +#define DECL_SEGFUNCS(SEG) \ +static inline void __set_seg_##SEG(u16 seg) { \ + __asm__("movw %w1, %%" #SEG : "=m"(__segment_##SEG) \ + : "rm"(seg)); \ +} \ +static inline u16 __get_seg_##SEG(void) { \ + u16 res; \ + __asm__("movw %%" #SEG ", %w0" : "=rm"(res) \ + : "m"(__segment_##SEG)); \ + return res; \ +} +DECL_SEGFUNCS(CS) +DECL_SEGFUNCS(DS) +DECL_SEGFUNCS(ES) +DECL_SEGFUNCS(FS) +DECL_SEGFUNCS(GS) +DECL_SEGFUNCS(SS) + +// Low level macros for getting/setting a segment register. +#define __SET_SEG(SEG, value) \ + __set_seg_##SEG(value) +#define __GET_SEG(SEG) \ + __get_seg_##SEG() + +// Macros for accessing a variable in another segment. (They +// automatically update the %es segment and then make the appropriate +// access.) +#define __GET_FARVAR(seg, var) ({ \ + SET_SEG(ES, (seg)); \ + GET_VAR(ES, (var)); }) +#define __SET_FARVAR(seg, var, val) do { \ + typeof(var) __sfv_val = (val); \ + SET_SEG(ES, (seg)); \ + SET_VAR(ES, (var), __sfv_val); \ + } while (0) + +// Macros for accesssing a 32bit flat mode pointer from 16bit real +// mode. (They automatically update the %es segment, break the +// pointer into segment/offset, and then make the access.) +#define __GET_FLATPTR(ptr) ({ \ + typeof(&(ptr)) __ptr = &(ptr); \ + GET_FARVAR(FLATPTR_TO_SEG(__ptr) \ + , *(typeof(__ptr))FLATPTR_TO_OFFSET(__ptr)); }) +#define __SET_FLATPTR(ptr, val) do { \ + typeof (&(ptr)) __ptr = &(ptr); \ + SET_FARVAR(FLATPTR_TO_SEG(__ptr) \ + , *(typeof(__ptr))FLATPTR_TO_OFFSET(__ptr) \ + , (val)); \ + } while (0) + +// Macros for converting to/from 32bit flat mode pointers to their +// equivalent 16bit segment/offset values. +#define FLATPTR_TO_SEG(p) (((u32)(p)) >> 4) +#define FLATPTR_TO_OFFSET(p) (((u32)(p)) & 0xf) +#define MAKE_FLATPTR(seg,off) ((void*)(((u32)(seg)<<4)+(u32)(off))) + + +#if MODESEGMENT == 1 + +// Definitions when using segmented mode. +#define GET_FARVAR(seg, var) __GET_FARVAR((seg), (var)) +#define SET_FARVAR(seg, var, val) __SET_FARVAR((seg), (var), (val)) +#define GET_VAR(seg, var) __GET_VAR("", seg, (var)) +#define SET_VAR(seg, var, val) __SET_VAR("", seg, (var), (val)) +#define SET_SEG(SEG, value) __SET_SEG(SEG, (value)) +#define GET_SEG(SEG) __GET_SEG(SEG) +#define GET_FLATPTR(ptr) __GET_FLATPTR(ptr) +#define SET_FLATPTR(ptr, val) __SET_FLATPTR((ptr), (val)) + +static inline void insb_fl(u16 port, void *ptr_fl, u16 count) { + SET_SEG(ES, FLATPTR_TO_SEG(ptr_fl)); + insb(port, (u8*)FLATPTR_TO_OFFSET(ptr_fl), count); +} +static inline void insw_fl(u16 port, void *ptr_fl, u16 count) { + SET_SEG(ES, FLATPTR_TO_SEG(ptr_fl)); + insw(port, (u16*)FLATPTR_TO_OFFSET(ptr_fl), count); +} +static inline void insl_fl(u16 port, void *ptr_fl, u16 count) { + SET_SEG(ES, FLATPTR_TO_SEG(ptr_fl)); + insl(port, (u32*)FLATPTR_TO_OFFSET(ptr_fl), count); +} +static inline void outsb_fl(u16 port, void *ptr_fl, u16 count) { + SET_SEG(ES, FLATPTR_TO_SEG(ptr_fl)); + outsb(port, (u8*)FLATPTR_TO_OFFSET(ptr_fl), count); +} +static inline void outsw_fl(u16 port, void *ptr_fl, u16 count) { + SET_SEG(ES, FLATPTR_TO_SEG(ptr_fl)); + outsw(port, (u16*)FLATPTR_TO_OFFSET(ptr_fl), count); +} +static inline void outsl_fl(u16 port, void *ptr_fl, u16 count) { + SET_SEG(ES, FLATPTR_TO_SEG(ptr_fl)); + outsl(port, (u32*)FLATPTR_TO_OFFSET(ptr_fl), count); +} + +#else + +// In 32-bit flat mode there is no need to mess with the segments. +#define GET_FARVAR(seg, var) \ + (*((typeof(&(var)))MAKE_FLATPTR((seg), &(var)))) +#define SET_FARVAR(seg, var, val) \ + do { GET_FARVAR((seg), (var)) = (val); } while (0) +#define GET_VAR(seg, var) (var) +#define SET_VAR(seg, var, val) do { (var) = (val); } while (0) +#define SET_SEG(SEG, value) ((void)(value)) +#define GET_SEG(SEG) 0 +#define GET_FLATPTR(ptr) (ptr) +#define SET_FLATPTR(ptr, val) do { (ptr) = (val); } while (0) + +#define insb_fl(port, ptr_fl, count) insb(port, ptr_fl, count) +#define insw_fl(port, ptr_fl, count) insw(port, ptr_fl, count) +#define insl_fl(port, ptr_fl, count) insl(port, ptr_fl, count) +#define outsb_fl(port, ptr_fl, count) outsb(port, ptr_fl, count) +#define outsw_fl(port, ptr_fl, count) outsw(port, ptr_fl, count) +#define outsl_fl(port, ptr_fl, count) outsl(port, ptr_fl, count) + +#endif + +#define SEGOFF(s,o) ({struct segoff_s __so; __so.offset=(o); __so.seg=(s); __so;}) + +static inline struct segoff_s FLATPTR_TO_SEGOFF(void *p) { + return SEGOFF(FLATPTR_TO_SEG(p), FLATPTR_TO_OFFSET(p)); +} +static inline void *SEGOFF_TO_FLATPTR(struct segoff_s so) { + return MAKE_FLATPTR(so.seg, so.offset); +} + +#endif // farptr.h |