//
// Copyright (C) 2008 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
#include "ioport.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(SEG, var) ({ \
- u8 __value; \
- __asm__ __volatile__("movb %%" #SEG ":%1, %b0" \
- : "=Qi"(__value) : "m"(var)); \
- __value; })
-#define READ16_SEG(SEG, var) ({ \
- u16 __value; \
- __asm__ __volatile__("movw %%" #SEG ":%1, %w0" \
- : "=ri"(__value) : "m"(var)); \
- __value; })
-#define READ32_SEG(SEG, var) ({ \
- u32 __value; \
- __asm__ __volatile__("movl %%" #SEG ":%1, %0" \
- : "=ri"(__value) : "m"(var)); \
- __value; })
-#define WRITE8_SEG(SEG, var, value) \
- __asm__ __volatile__("movb %b0, %%" #SEG ":%1" \
- : : "Q"(value), "m"(var))
-#define WRITE16_SEG(SEG, var, value) \
- __asm__ __volatile__("movw %w0, %%" #SEG ":%1" \
- : : "r"(value), "m"(var))
-#define WRITE32_SEG(SEG, var, value) \
- __asm__ __volatile__("movl %0, %%" #SEG ":%1" \
- : : "r"(value), "m"(var))
+#define READ8_SEG(SEG, value, var) \
+ __asm__("movb %%" #SEG ":%1, %b0" : "=Qi"(value) \
+ : "m"(var), "m"(__segment_ ## SEG))
+#define READ16_SEG(SEG, value, var) \
+ __asm__("movw %%" #SEG ":%1, %w0" : "=ri"(value) \
+ : "m"(var), "m"(__segment_ ## SEG))
+#define READ32_SEG(SEG, value, var) \
+ __asm__("movl %%" #SEG ":%1, %0" : "=ri"(value) \
+ : "m"(var), "m"(__segment_ ## SEG))
+#define READ64_SEG(SEG, value, var) do { \
+ union u64_u32_u *__w64_ptr = (union u64_u32_u *)&(value); \
+ union u64_u32_u *__r64_ptr = (union u64_u32_u *)&(var); \
+ READ32_SEG(SEG, __w64_ptr->hi, __r64_ptr->hi); \
+ READ32_SEG(SEG, __w64_ptr->lo, __r64_ptr->lo); \
+ } while (0)
+#define WRITE8_SEG(SEG, var, value) \
+ __asm__("movb %b1, %%" #SEG ":%0" : "=m"(var) \
+ : "Q"(value), "m"(__segment_ ## SEG))
+#define WRITE16_SEG(SEG, var, value) \
+ __asm__("movw %w1, %%" #SEG ":%0" : "=m"(var) \
+ : "r"(value), "m"(__segment_ ## SEG))
+#define WRITE32_SEG(SEG, var, value) \
+ __asm__("movl %1, %%" #SEG ":%0" : "=m"(var) \
+ : "r"(value), "m"(__segment_ ## SEG))
+#define WRITE64_SEG(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); \
+ } while (0)
// Low level macros for getting/setting a segment register.
#define __SET_SEG(SEG, value) \
- __asm__ __volatile__("movw %w0, %%" #SEG : : "r"(value))
+ __asm__("movw %w1, %%" #SEG : "=m"(__segment_ ## SEG) \
+ : "r"(value))
#define __GET_SEG(SEG) ({ \
u16 __seg; \
- __asm__ __volatile__("movw %%" #SEG ", %w0" : "=r"(__seg)); \
+ __asm__("movw %%" #SEG ", %w0" : "=r"(__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)) \
- __val = READ8_SEG(seg, var); \
- else if (__builtin_types_compatible_p(typeof(__val), u16)) \
- __val = READ16_SEG(seg, var); \
- else if (__builtin_types_compatible_p(typeof(__val), u32)) \
- __val = READ32_SEG(seg, var); \
- else \
- __force_link_error__unknown_type(); \
+#define __GET_VAR(seg, var) ({ \
+ typeof(var) __val; \
+ if (sizeof(__val) == 1) \
+ READ8_SEG(seg, __val, var); \
+ else if (sizeof(__val) == 2) \
+ READ16_SEG(seg, __val, var); \
+ else if (sizeof(__val) == 4) \
+ READ32_SEG(seg, __val, var); \
+ else if (sizeof(__val) == 8) \
+ READ64_SEG(seg, __val, var); \
+ else \
+ __force_link_error__unknown_type(); \
__val; })
-#define __SET_VAR(seg, var, val) do { \
- if (__builtin_types_compatible_p(typeof(var), u8)) \
- WRITE8_SEG(seg, var, (val)); \
- else if (__builtin_types_compatible_p(typeof(var), u16)) \
- WRITE16_SEG(seg, var, (val)); \
- else if (__builtin_types_compatible_p(typeof(var), u32)) \
- WRITE32_SEG(seg, var, (val)); \
- else \
- __force_link_error__unknown_type(); \
+#define __SET_VAR(seg, var, val) do { \
+ if (sizeof(var) == 1) \
+ WRITE8_SEG(seg, var, (val)); \
+ else if (sizeof(var) == 2) \
+ WRITE16_SEG(seg, var, (val)); \
+ else if (sizeof(var) == 4) \
+ WRITE32_SEG(seg, var, (val)); \
+ else if (sizeof(var) == 8) \
+ WRITE64_SEG(seg, var, (val)); \
+ else \
+ __force_link_error__unknown_type(); \
} while (0)
// Macros for accessing a variable in another segment. (They
SET_VAR(ES, (var), __sfv_val); \
} while (0)
-// Macros for accesssing a 32bit pointer from 16bit mode. (They
+// Macros for accesssing a 32bit pointer from 16bit real 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(PTR_TO_SEG(__ptr), *(typeof __ptr)PTR_TO_OFFSET(__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(PTR_TO_SEG(__ptr), *(typeof __ptr)PTR_TO_OFFSET(__ptr) \
+ typeof (&(ptr)) __ptr = &(ptr); \
+ SET_FARVAR(FARPTR_TO_SEG(__ptr) \
+ , *(typeof(__ptr))FARPTR_TO_OFFSET(__ptr) \
, (val)); \
} while (0)
// Macros for converting to/from 32bit style pointers to their
// equivalent 16bit segment/offset values.
-#define PTR_TO_SEG(p) (((u32)(p)) >> 4)
-#define PTR_TO_OFFSET(p) (((u32)(p)) & 0xf)
-#define MAKE_32_PTR(seg,off) ((void*)(((seg)<<4)+(off)))
+#define FARPTR_TO_SEG(p) (((u32)(p)) >> 4)
+#define FARPTR_TO_OFFSET(p) (((u32)(p)) & 0xf)
+#define MAKE_FARPTR(seg,off) ((void*)(((u32)(seg)<<4)+(u32)(off)))
-#ifdef MODE16
+#if MODE16 == 1
// Definitions when in 16 bit mode.
#define GET_FARVAR(seg, var) __GET_FARVAR((seg), (var))
#define SET_FARPTR(ptr, val) __SET_FARPTR((ptr), (val))
static inline void insb_far(u16 port, void *farptr, u16 count) {
- SET_SEG(ES, PTR_TO_SEG(farptr));
- insb(port, (u8*)PTR_TO_OFFSET(farptr), count);
+ SET_SEG(ES, FARPTR_TO_SEG(farptr));
+ insb(port, (u8*)FARPTR_TO_OFFSET(farptr), count);
}
static inline void insw_far(u16 port, void *farptr, u16 count) {
- SET_SEG(ES, PTR_TO_SEG(farptr));
- insw(port, (u16*)PTR_TO_OFFSET(farptr), count);
+ SET_SEG(ES, FARPTR_TO_SEG(farptr));
+ insw(port, (u16*)FARPTR_TO_OFFSET(farptr), count);
}
static inline void insl_far(u16 port, void *farptr, u16 count) {
- SET_SEG(ES, PTR_TO_SEG(farptr));
- insl(port, (u32*)PTR_TO_OFFSET(farptr), count);
+ SET_SEG(ES, FARPTR_TO_SEG(farptr));
+ insl(port, (u32*)FARPTR_TO_OFFSET(farptr), count);
}
static inline void outsb_far(u16 port, void *farptr, u16 count) {
- SET_SEG(ES, PTR_TO_SEG(farptr));
- outsb(port, (u8*)PTR_TO_OFFSET(farptr), count);
+ SET_SEG(ES, FARPTR_TO_SEG(farptr));
+ outsb(port, (u8*)FARPTR_TO_OFFSET(farptr), count);
}
static inline void outsw_far(u16 port, void *farptr, u16 count) {
- SET_SEG(ES, PTR_TO_SEG(farptr));
- outsw(port, (u16*)PTR_TO_OFFSET(farptr), count);
+ SET_SEG(ES, FARPTR_TO_SEG(farptr));
+ outsw(port, (u16*)FARPTR_TO_OFFSET(farptr), count);
}
static inline void outsl_far(u16 port, void *farptr, u16 count) {
- SET_SEG(ES, PTR_TO_SEG(farptr));
- outsl(port, (u32*)PTR_TO_OFFSET(farptr), count);
+ SET_SEG(ES, FARPTR_TO_SEG(farptr));
+ outsl(port, (u32*)FARPTR_TO_OFFSET(farptr), count);
}
#else
// In 32-bit mode there is no need to mess with the segments.
#define GET_FARVAR(seg, var) \
- (*((typeof(&(var)))MAKE_32_PTR((seg), (u32)&(var))))
+ (*((typeof(&(var)))MAKE_FARPTR((seg), (u32)&(var))))
#define SET_FARVAR(seg, var, val) \
do { GET_FARVAR((seg), (var)) = (val); } while (0)
#define GET_VAR(seg, var) (var)
#define SET_SEG(SEG, value) ((void)(value))
#define GET_SEG(SEG) 0
#define GET_FARPTR(ptr) (ptr)
-#define SET_FARPTR(ptr, val) do { (var) = (val); } while (0)
+#define SET_FARPTR(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)