janwas
9476dc4ad0
sysdep: remove round; document several functions; use ia32.h header instead of a hack that extern-declared sysdep functions that are implemented as macro-redirection wsdl: add SDL_EnableKeyRepeat stub; group related functions in header together; no longer need OS_WIN wrapper around that This was SVN commit r3115.
139 lines
3.5 KiB
C
Executable File
139 lines
3.5 KiB
C
Executable File
// IA-32 (x86) specific code
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// Copyright (c) 2003 Jan Wassenberg
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// Contact info:
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// Jan.Wassenberg@stud.uni-karlsruhe.de
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// http://www.stud.uni-karlsruhe.de/~urkt/
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#ifndef IA32_H
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#define IA32_H
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#if !CPU_IA32
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#error "including ia32.h without CPU_IA32=1"
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#endif
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#include "lib/types.h"
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// some of these are implemented in asm, so make sure name mangling is
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// disabled.
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#ifdef __cplusplus
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extern "C" {
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#endif
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// call before any of the following functions
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extern void ia32_init();
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//
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// fast implementations of some sysdep.h functions; see documentation there
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//
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extern float ia32_rintf(float f);
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extern double ia32_rint(double f);
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extern i32 ia32_i32_from_float(float f);
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extern i32 ia32_i32_from_double(double d);
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extern i64 ia32_i64_from_double(double d);
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extern void* ia32_memcpy(void* dst, const void* src, size_t nbytes); // asm
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// FPU control word
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// .. Precision Control:
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#define IA32_MCW_PC 0x0300
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#define IA32_PC_24 0x0000
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// .. Rounding Control:
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#define IA32_MCW_RC 0x0C00
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#define IA32_RC_NEAR 0x0000
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#define IA32_RC_DOWN 0x0400
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#define IA32_RC_UP 0x0800
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#define IA32_RC_CHOP 0x0C00
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// .. Exception Mask:
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#define IA32_MCW_EM 0x003f
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#define IA32_EM_INVALID BIT(0)
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#define IA32_EM_DENORMAL BIT(1)
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#define IA32_EM_ZERODIVIDE BIT(2)
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#define IA32_EM_OVERFLOW BIT(3)
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#define IA32_EM_UNDERFLOW BIT(4)
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#define IA32_EM_INEXACT BIT(5)
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extern uint ia32_control87(uint new_val, uint mask); // asm
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extern u64 rdtsc(void);
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extern void ia32_debug_break(void);
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// CPU caps (128 bits)
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// do not change the order!
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enum CpuCap
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{
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// standard (ecx) - currently only defined by Intel
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SSE3 = 0+0, // Streaming SIMD Extensions 3
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EST = 0+7, // Enhanced Speedstep Technology
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// standard (edx)
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TSC = 32+4, // TimeStamp Counter
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CMOV = 32+15, // Conditional MOVe
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MMX = 32+23, // MultiMedia eXtensions
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SSE = 32+25, // Streaming SIMD Extensions
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SSE2 = 32+26, // Streaming SIMD Extensions 2
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HT = 32+28, // HyperThreading
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// extended (ecx)
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// extended (edx) - currently only defined by AMD
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AMD_MP = 96+19, // MultiProcessing capable; reserved on AMD64
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AMD_3DNOW_PRO = 96+30,
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AMD_3DNOW = 96+31
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};
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extern bool ia32_cap(CpuCap cap);
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extern void ia32_get_cpu_info(void);
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extern void ia32_hook_capabilities(void);
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//-----------------------------------------------------------------------------
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// internal use only
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// write the current execution state (e.g. all register values) into
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// (Win32::CONTEXT*)pcontext (defined as void* to avoid dependency).
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extern void ia32_get_current_context(void* pcontext);
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extern int ia32_get_call_target(void* ret_addr, void** target);
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// order in which registers are stored in regs array
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// (do not change! brand string relies on this ordering)
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enum IA32Regs
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{
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EAX,
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EBX,
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ECX,
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EDX
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};
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// try to call the specified CPUID sub-function. returns true on success or
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// false on failure (i.e. CPUID or the specific function not supported).
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// returns eax, ebx, ecx, edx registers in above order.
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extern bool ia32_cpuid(u32 func, u32* regs);
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#ifdef __cplusplus
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}
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#endif
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#endif // #ifndef IA32_H
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