// Code to access multiple segments within gcc.
//
-// Copyright (C) 2008 Kevin O'Connor <kevin@koconnor.net>
+// Copyright (C) 2008,2009 Kevin O'Connor <kevin@koconnor.net>
//
-// This file may be distributed under the terms of the GNU GPLv3 license.
+// This file may be distributed under the terms of the GNU LGPLv3 license.
#ifndef __FARPTR_H
#define __FARPTR_H
// 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(SEG, var) ({ \
- typeof(var) __value; \
- __asm__("movb %%" #SEG ":%1, %b0" : "=Qi"(__value) \
- : "m"(var), "m"(__segment_ ## SEG)); \
- __value; })
-#define READ16_SEG(SEG, var) ({ \
- typeof(var) __value; \
- __asm__("movw %%" #SEG ":%1, %w0" : "=ri"(__value) \
- : "m"(var), "m"(__segment_ ## SEG)); \
- __value; })
-#define READ32_SEG(SEG, var) ({ \
- typeof(var) __value; \
- __asm__("movl %%" #SEG ":%1, %0" : "=ri"(__value) \
- : "m"(var), "m"(__segment_ ## SEG)); \
- __value; })
-#define READ64_SEG(SEG, var) ({ \
- union u64_u32_u __value; \
- union u64_u32_u *__r64_ptr = (union u64_u32_u *)&(var); \
- __value.hi = READ32_SEG(SEG, __r64_ptr->hi); \
- __value.lo = READ32_SEG(SEG, __r64_ptr->lo); \
- __value.val; })
-#define WRITE8_SEG(SEG, var, value) \
- __asm__("movb %b1, %%" #SEG ":%0" : "=m"(var) \
+#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.hi, __r64_ptr->hi); \
+ READ32_SEG(prefix, SEG, __value.lo, __r64_ptr->lo); \
+ *(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(SEG, var, value) \
- __asm__("movw %w1, %%" #SEG ":%0" : "=m"(var) \
+#define WRITE16_SEG(prefix, SEG, var, value) \
+ __asm__(prefix "movw %w1, %%" #SEG ":%0" : "=m"(var) \
: "r"(value), "m"(__segment_ ## SEG))
-#define WRITE32_SEG(SEG, var, value) \
- __asm__("movl %1, %%" #SEG ":%0" : "=m"(var) \
+#define WRITE32_SEG(prefix, SEG, var, value) \
+ __asm__(prefix "movl %1, %%" #SEG ":%0" : "=m"(var) \
: "r"(value), "m"(__segment_ ## SEG))
-#define WRITE64_SEG(SEG, var, value) do { \
+#define WRITE64_SEG(prefix, SEG, var, value) do { \
union u64_u32_u __value; \
union u64_u32_u *__w64_ptr = (union u64_u32_u *)&(var); \
- __value.val = (value); \
- WRITE32_SEG(SEG, __w64_ptr->hi, __value.hi); \
- WRITE32_SEG(SEG, __w64_ptr->lo, __value.lo); \
+ typeof(var) __value_tmp = (value); \
+ __value.val = *(u64*)&__value_tmp; \
+ WRITE32_SEG(prefix, SEG, __w64_ptr->hi, __value.hi); \
+ WRITE32_SEG(prefix, SEG, __w64_ptr->lo, __value.lo); \
+ } 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)
// Low level macros for getting/setting a segment register.
#define __SET_SEG(SEG, value) \
__asm__("movw %w1, %%" #SEG : "=m"(__segment_ ## SEG) \
- : "r"(value))
+ : "rm"(value))
#define __GET_SEG(SEG) ({ \
u16 __seg; \
- __asm__("movw %%" #SEG ", %w0" : "=r"(__seg) \
+ __asm__("movw %%" #SEG ", %w0" : "=rm"(__seg) \
: "m"(__segment_ ## SEG)); \
__seg;})
-// Macros for automatically choosing the appropriate memory size
-// access method.
-extern void __force_link_error__unknown_type();
-
-#define __GET_VAR(seg, var) ({ \
- typeof(var) __val; \
- if (__builtin_types_compatible_p(typeof(__val), u8) \
- || __builtin_types_compatible_p(typeof(__val), s8)) \
- __val = READ8_SEG(seg, var); \
- else if (__builtin_types_compatible_p(typeof(__val), u16) \
- || __builtin_types_compatible_p(typeof(__val), s16)) \
- __val = READ16_SEG(seg, var); \
- else if (__builtin_types_compatible_p(typeof(__val), u32) \
- || __builtin_types_compatible_p(typeof(__val), s32)) \
- __val = READ32_SEG(seg, var); \
- else if (__builtin_types_compatible_p(typeof(__val), u64) \
- || __builtin_types_compatible_p(typeof(__val), s64)) \
- __val = READ64_SEG(seg, var); \
- else \
- __force_link_error__unknown_type(); \
- __val; })
-
-#define __SET_VAR(seg, var, val) do { \
- if (__builtin_types_compatible_p(typeof(var), u8) \
- || __builtin_types_compatible_p(typeof(var), s8)) \
- WRITE8_SEG(seg, var, (val)); \
- else if (__builtin_types_compatible_p(typeof(var), u16) \
- || __builtin_types_compatible_p(typeof(var), s16)) \
- WRITE16_SEG(seg, var, (val)); \
- else if (__builtin_types_compatible_p(typeof(var), u32) \
- || __builtin_types_compatible_p(typeof(var), s32)) \
- WRITE32_SEG(seg, var, (val)); \
- else if (__builtin_types_compatible_p(typeof(var), u64) \
- || __builtin_types_compatible_p(typeof(var), s64)) \
- WRITE64_SEG(seg, var, (val)); \
- else \
- __force_link_error__unknown_type(); \
- } while (0)
-
// Macros for accessing a variable in another segment. (They
// automatically update the %es segment and then make the appropriate
// access.)
SET_VAR(ES, (var), __sfv_val); \
} while (0)
-// Macros for accesssing a 32bit pointer from 16bit mode. (They
-// automatically update the %es segment, break the pointer into
-// segment/offset, and then make the access.)
-#define __GET_FARPTR(ptr) ({ \
- typeof(&(ptr)) __ptr = &(ptr); \
- GET_FARVAR(FARPTR_TO_SEG(__ptr) \
- , *(typeof(__ptr))FARPTR_TO_OFFSET(__ptr)); })
-#define __SET_FARPTR(ptr, val) do { \
- typeof (&(ptr)) __ptr = &(ptr); \
- SET_FARVAR(FARPTR_TO_SEG(__ptr) \
- , *(typeof(__ptr))FARPTR_TO_OFFSET(__ptr) \
- , (val)); \
+// 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 style pointers to their
+// Macros for converting to/from 32bit flat mode pointers to their
// equivalent 16bit segment/offset values.
-#define FARPTR_TO_SEG(p) (((u32)(p)) >> 4)
-#define FARPTR_TO_OFFSET(p) (((u32)(p)) & 0xf)
-#define MAKE_FARPTR(seg,off) ((void*)(((seg)<<4)+(off)))
+#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)))
-#ifdef MODE16
+#if MODESEGMENT == 1
-// Definitions when in 16 bit mode.
+// 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 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_FARPTR(ptr) __GET_FARPTR(ptr)
-#define SET_FARPTR(ptr, val) __SET_FARPTR((ptr), (val))
+#define GET_FLATPTR(ptr) __GET_FLATPTR(ptr)
+#define SET_FLATPTR(ptr, val) __SET_FLATPTR((ptr), (val))
-static inline void insb_far(u16 port, void *farptr, u16 count) {
- SET_SEG(ES, FARPTR_TO_SEG(farptr));
- insb(port, (u8*)FARPTR_TO_OFFSET(farptr), count);
+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_far(u16 port, void *farptr, u16 count) {
- SET_SEG(ES, FARPTR_TO_SEG(farptr));
- insw(port, (u16*)FARPTR_TO_OFFSET(farptr), 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_far(u16 port, void *farptr, u16 count) {
- SET_SEG(ES, FARPTR_TO_SEG(farptr));
- insl(port, (u32*)FARPTR_TO_OFFSET(farptr), 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_far(u16 port, void *farptr, u16 count) {
- SET_SEG(ES, FARPTR_TO_SEG(farptr));
- outsb(port, (u8*)FARPTR_TO_OFFSET(farptr), 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_far(u16 port, void *farptr, u16 count) {
- SET_SEG(ES, FARPTR_TO_SEG(farptr));
- outsw(port, (u16*)FARPTR_TO_OFFSET(farptr), 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_far(u16 port, void *farptr, u16 count) {
- SET_SEG(ES, FARPTR_TO_SEG(farptr));
- outsl(port, (u32*)FARPTR_TO_OFFSET(farptr), 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 mode there is no need to mess with the segments.
+// In 32-bit flat mode there is no need to mess with the segments.
#define GET_FARVAR(seg, var) \
- (*((typeof(&(var)))MAKE_FARPTR((seg), (u32)&(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_FARPTR(ptr) (ptr)
-#define SET_FARPTR(ptr, val) do { (ptr) = (val); } while (0)
+#define GET_FLATPTR(ptr) (ptr)
+#define SET_FLATPTR(ptr, val) do { (ptr) = (val); } while (0)
-#define insb_far(port, farptr, count) insb(port, farptr, count)
-#define insw_far(port, farptr, count) insw(port, farptr, count)
-#define insl_far(port, farptr, count) insl(port, farptr, count)
-#define outsb_far(port, farptr, count) outsb(port, farptr, count)
-#define outsw_far(port, farptr, count) outsw(port, farptr, count)
-#define outsl_far(port, farptr, count) outsl(port, farptr, count)
+#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
+// Definition for common 16bit segment/offset pointers.
+struct segoff_s {
+ union {
+ struct {
+ u16 offset;
+ u16 seg;
+ };
+ u32 segoff;
+ };
+};
+#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
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