janwas
c45ef68a88
cpu: accessor functions ensure what they return is valid. no longer needs to call wtime_reset_impl (ugh). uses ModuleInitState. ia32: add APIC ID accessor and prevent redundant init This was SVN commit r5093.
103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
/**
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* =========================================================================
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* File : ia32_asm.h
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* Project : 0 A.D.
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* Description : interface to various IA-32 functions (written in asm)
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#ifndef INCLUDED_IA32_ASM
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#define INCLUDED_IA32_ASM
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* prepare ia32_asm_cpuid for use (detects which CPUID functions are
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* available). called by ia32_Init.
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**/
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extern void ia32_asm_cpuid_init();
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/**
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* order in which ia32_asm_cpuid stores register values
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**/
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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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/**
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* try to call the specified CPUID sub-function.
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* (note: ECX is set to 0 beforehand as required by sub-function 4)
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* fills register array according to IA32Regs.
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* @return true on success or false if the sub-function isn't supported.
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**/
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extern bool ia32_asm_cpuid(u32 func, u32* regs);
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/**
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* for all 1-bits in mask, update the corresponding FPU control word bits
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* with the bit values in new_val.
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* @return 0 to indicate success.
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**/
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extern uint ia32_asm_control87(uint new_val, uint mask);
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/**
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* @return the current value of the TimeStampCounter in edx:eax
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* (interpretable as a u64 when using the standard Win32 calling convention)
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**/
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extern u64 ia32_asm_rdtsc_edx_eax(void);
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/**
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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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**/
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extern void ia32_asm_GetCurrentContext(void* pcontext);
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// implementations of the cpu.h interface
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/// see cpu_AtomicAdd
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extern void ia32_asm_AtomicAdd(volatile intptr_t* location, intptr_t increment);
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/// see cpu_CAS
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extern bool ia32_asm_CAS(volatile uintptr_t* location, uintptr_t expected, uintptr_t new_value);
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/// see cpu_i32FromFloat
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extern i32 ia32_asm_i32FromFloat(float f);
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extern i32 ia32_asm_i32FromDouble(double d);
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extern i64 ia32_asm_i64FromDouble(double d);
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// backends for POSIX/SUS functions
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/// see fpclassify
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extern uint ia32_asm_fpclassifyd(double d);
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extern uint ia32_asm_fpclassifyf(float f);
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/// see rintf
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extern float ia32_asm_rintf(float);
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extern double ia32_asm_rint(double);
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extern float ia32_asm_fminf(float, float);
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extern float ia32_asm_fmaxf(float, float);
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// misc
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/**
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* @return the (integral) base 2 logarithm, or -1 if the number
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* is not a power-of-two.
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**/
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extern int ia32_asm_log2_of_pow2(uint n);
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#ifdef __cplusplus
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}
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#endif
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#endif // #ifndef INCLUDED_IA32_ASM
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