//**************************************************************************
//*                     This file is part of the                           *
//*                      Mpxplay - audio player.                           *
//*                  The source code of Mpxplay is                         *
//*        (C) copyright 1998-2006 by PDSoft (Attila Padar)                *
//*                    http://mpxplay.cjb.net                              *
//*                  email: mpxplay@freemail.hu                            *
//**************************************************************************
//*  This program is distributed in the hope that it will be useful,       *
//*  but WITHOUT ANY WARRANTY; without even the implied warranty of        *
//*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                  *
//*  Please contact with the author (with me) if you want to use           *
//*  or modify this source.                                                *
//**************************************************************************
//function: cpu control
//some routines are based on Linux,MPlayer and VGA13 (by RayeR/Martin Rehak)

#include <stdlib.h>
#include <dos.h>
#include "newfunc.h"

//#define NEWFUNC_CPU_DEBUG 1

int mpxplay_cpu_capables_std,mpxplay_cpu_capables_ext,mpxplay_cpu_capables_mm;
static unsigned int mpxplay_cpu_initialized;

void newfunc_cpu_init(void)
{
 int eax,ebx,ecx,edx,cap_std,cap_ext,cap_mm;

 if(mpxplay_cpu_initialized)
  return;
 mpxplay_cpu_initialized=1;

 if(!pds_cpu_cpuid_test())
  return;

 cap_ext=cap_mm=0;

 //if(pds_cpu_cpuid_get(1, &ebx, &ecx, &edx)>=1){
 if(pds_cpu_cpuid_get(1, &ebx, &ecx, &cap_std)>=1){
  //pds_cpu_cpuid_get(1, &ebx, &ecx, &cap_std); // ???
  mpxplay_cpu_capables_std=cap_std;
  if(cap_std & CPU_X86_STDCAP_MMX)
   cap_mm |= CPU_X86_MMCAP_MMX;
  if(cap_std & CPU_X86_STDCAP_SSE1)
   cap_mm |= CPU_X86_MMCAP_MMXEXT | CPU_X86_MMCAP_SSE;
  if(cap_std & CPU_X86_STDCAP_SSE2)
   cap_mm |= CPU_X86_MMCAP_SSE2;
 }
 if(pds_cpu_cpuid_get(0x80000000, &ebx, &ecx, &edx)>=0x80000001){
  pds_cpu_cpuid_get(0x80000001, &ebx, &ecx, &cap_ext);
  mpxplay_cpu_capables_ext=cap_ext;
  if(cap_ext & CPU_X86_EXTCAP_3DNOW1)
   cap_mm |= CPU_X86_MMCAP_3DNOW;
  if(cap_ext & CPU_X86_EXTCAP_3DNOW2)
   cap_mm |= CPU_X86_MMCAP_3DNOWEXT;
  if(cap_ext & CPU_X86_EXTCAP_MMXEXT)
   cap_mm |= CPU_X86_MMCAP_MMX;
 }

 eax = pds_cpu_cpuid_get(0, &ebx, &ecx, &edx);
 if(ebx == 0x68747541 && edx == 0x69746e65 && ecx == 0x444d4163){ // AMD
  if(cap_ext & (1<<22))
   cap_mm |= CPU_X86_MMCAP_MMXEXT;
 }else
  if(ebx == 0x746e6543 && edx == 0x48727561 && ecx == 0x736c7561){ //  CentaurHauls
   if(cap_ext & (1<<24)) // VIA C3
    cap_mm |= CPU_X86_MMCAP_MMXEXT;
  }else
   if(ebx == 0x69727943 && edx == 0x736e4978 && ecx == 0x64616574){
    if(eax>=2)
     if(cap_ext & (1<<24))
      cap_mm |= CPU_X86_MMCAP_MMXEXT;
   }
 mpxplay_cpu_capables_mm=cap_mm;

#ifdef NEWFUNC_CPU_DEBUG
 fprintf(stdout,"cpu features: MMX:%d MMX2(iSSE):%d SSE:%d SSE2:%d 3dNow:%d 3dNow2:%d\n\n"
  ,((cap_mm&CPU_X86_MMCAP_MMX)? 1:0),((cap_mm&CPU_X86_MMCAP_MMXEXT)? 1:0),((cap_mm&CPU_X86_MMCAP_SSE)? 1:0),
  ((cap_mm&CPU_X86_MMCAP_SSE2)? 1:0),((cap_mm&CPU_X86_MMCAP_3DNOW)? 1:0),((cap_mm&CPU_X86_MMCAP_3DNOWEXT)? 1:0));
#endif //NEWFUNC_CPU_DEBUG
}

int asm_cpu_testcpuid(void);

#pragma aux asm_cpu_testcpuid=\
 "pushad"\
 "pushfd"\
 "pop     eax"\
 "mov     ecx, eax"\
 "xor     eax, 0x200000"\
 "push    eax"\
 "popfd"\
 "pushfd"\
 "pop     eax"\
 "cmp     eax, ecx"\
 "popad"\
 "setnz   al"\
 "and     eax,1"\
 value[eax] modify[eax ecx];

int asm_cpu_getcpuid(unsigned int eax_p,int *ebx_p,int *ecx_p,int *edx_p);

#pragma aux asm_cpu_getcpuid=\
 "push ebx"\
 "push ecx"\
 "push edx"\
 "cpuid"\
 "pop edi"\
 "mov [edi],edx"\
 "pop edi"\
 "mov [edi],ecx"\
 "pop edi"\
 "mov [edi],ebx"\
 parm[eax][ebx][ecx][edx] value[eax] modify[ebx ecx edx edi];

unsigned int pds_cpu_cpuid_test(void)
{
 return asm_cpu_testcpuid();
}

int pds_cpu_cpuid_get(unsigned int eax_p,int *ebx_p,int *ecx_p,int *edx_p)
{
 return asm_cpu_getcpuid(eax_p,ebx_p,ecx_p,edx_p);
}

//--------------------------------------------------------------------------
//MTRR (cache) setting

#ifdef __DOS__

#define MTRR_REG_CAP            0x0fe
#define MTRR_REG_DEFTYPE        0x2ff
#define MTRR_REG_PHYSBASE(reg) (0x200 + 2 * (reg))
#define MTRR_REG_PHYSMASK(reg) (0x200 + 2 * (reg) + 1)
#define MTRR_REG_FIX16K_A0000   0x259
#define MTRR_REG_PAT            0x277

#define MTRR_MODE_UC 0x00     //
#define MTRR_MODE_WC 0x01     // write-combining

#define MTRR_GET_PB_MODE(v)        ((v)&0xff)           // type of memory
#define MTRR_PUT_PB_MODE(r,v)      (((r)&(~0xff))|(v))
#define MTRR_GET_PB_PHYS_BASE(v)   (((v)>>12)&0xffffff) // 36-bit phys_base address (low bits=0)
#define MTRR_PUT_PB_PHYS_BASE(r,v) (((r)&(~((mpxp_int64_t)0xffffff<<12)))|((mpxp_int64_t)((v)&0xffffff)<<12))

#define MTRR_GET_PM_VALID(v)       (((v)>>11)&0x1)      // MTRR var register is valid (used)
#define MTRR_PUT_PM_VALID(r,v)     (((r)&(~(1<<11)))|(((v)&1)<<11))
#define MTRR_GET_PM_PHYS_MASK(v)   (((v)>>12)&0xffffff) // 36-bit phys_mask (low bits=0)
#define MTRR_PUT_PM_PHYS_MASK(r,v) (((r)&(~((mpxp_int64_t)0xffffff<<12)))|((mpxp_int64_t)((v)&0xffffff)<<12))

#define MTRR_PUT_PAT(r,pa,v)   (((r)&(~((mpxp_int64_t)0xff<<(pa*8))))|((mpxp_int64_t)((v)&0xff)<<(pa*8)))

unsigned long asm_read_cr0(void);
void asm_write_cr0(unsigned long);
unsigned long asm_read_cr3(void);
void asm_write_cr3(unsigned long);
unsigned long asm_read_cr4(void);
void asm_write_cr4(unsigned long);
void asm_wbinvd(void);
void asm_flush_tlb(void);

#pragma aux asm_read_cr0 value[eax] = "mov eax,cr0"
#pragma aux asm_write_cr0 parm[eax] = "mov cr0,eax"
#pragma aux asm_read_cr3 value[eax] = "mov eax,cr3"
#pragma aux asm_write_cr3 parm[eax] = "mov cr3,eax"
#pragma aux asm_read_cr4 value[eax] = "mov eax,cr4"
#pragma aux asm_write_cr4 parm[eax] = "mov cr4,eax"
#pragma aux asm_wbinvd = "wbinvd"
#pragma aux asm_flush_tlb = "mov eax,cr3" "mov cr3,eax"

#define ENTER_CRITICAL IRQ_PUSH_OFF()
 void IRQ_PUSH_OFF (void);
#pragma aux IRQ_PUSH_OFF = \
	"pushfd",          \
	"cli"              \
	modify [esp];

#define LEAVE_CRITICAL IRQ_POP()
 void IRQ_POP (void);
#pragma aux IRQ_POP =   \
		"popfd" \
		"sti"   \
		modify [esp];

unsigned long asm_mtrr_read(unsigned long index,unsigned long *high);

static void pds_cpu_mtrr_read(unsigned long index,mpxp_int64_t *hilo)
{
#ifdef __WATCOMC__
 unsigned long hi,lo;
#pragma aux asm_mtrr_read=\
 "mov ecx,eax"\
 "push edx"\
 "xor eax,eax"\
 "xor edx,edx"\
 "rdmsr"\
 "pop ecx"\
 "mov dword ptr [ecx],edx"\
 parm[eax][edx] value[eax] modify[ecx];
 lo=asm_mtrr_read(index,&hi);
 *hilo=(((mpxp_int64_t)hi)<<32)|((mpxp_int64_t)lo);
#else
 *hilo=0;
#endif
}

void asm_mtrr_write(unsigned long index,unsigned long lo,unsigned long hi);

static void pds_cpu_mtrr_write(unsigned long index,mpxp_int64_t hilo)
{
#ifdef __WATCOMC__
#pragma aux asm_mtrr_write=\
 "wrmsr"\
 parm[ecx][eax][edx] modify[];
 asm_mtrr_write(index,(unsigned long)(hilo&0xffffffff),(unsigned long)(hilo>>32));
#endif
}

static unsigned long cpu_reg_cr4;
static mpxp_int64_t mtrr_deftype;

static void pds_cpu_mtrr_cache_disable(void)
{
 unsigned long cr0;

 // Enter the no-fill (CD=1, NW=0) cache mode and flush caches.
 cr0 = asm_read_cr0() | 0x40000000;	// set CD flag
 asm_wbinvd();
 asm_write_cr0(cr0);
 asm_wbinvd();
 //  Save value of CR4 and clear Page Global Enable (bit 7)
 if(mpxplay_cpu_capables_std&CPU_X86_STDCAP_PGE){
  cpu_reg_cr4 = asm_read_cr4();
  asm_write_cr4(cpu_reg_cr4 & (unsigned char) ~(1 << 7));
 }
 asm_flush_tlb();  // Flush all TLBs
 pds_cpu_mtrr_read(MTRR_REG_DEFTYPE, &mtrr_deftype); //  Save MTRR state
 pds_cpu_mtrr_write(MTRR_REG_DEFTYPE, mtrr_deftype & 0xffffffff0000f300); //  Disable MTRRs, and set the default type to uncached
}

static void pds_cpu_mtrr_cache_enable(void)
{
 asm_wbinvd();     // flush caches
 asm_flush_tlb();  // flush TLBs
 pds_cpu_mtrr_write(MTRR_REG_DEFTYPE, mtrr_deftype); // Intel (P6) standard MTRRs
 asm_write_cr0(asm_read_cr0() & 0xbfffffff);  // enable caches
 if(mpxplay_cpu_capables_std&CPU_X86_STDCAP_PGE)
  asm_write_cr4(cpu_reg_cr4);  // Restore value of CR4
}

#endif

//#define MTRR_DEBUG 1

static unsigned int pds_cpu_mtrr_setmode(unsigned long phys_ptr,unsigned long size_kb,unsigned int mode)
{
#ifdef __DOS__
 unsigned long phys_base_ptr_shifted=phys_ptr>>12;
 mpxp_int64_t hilo,mtrr_var_pb,mtrr_var_pm;
 int index=-1;
 unsigned long lo,hi,mtrr_var_cnt,i;
 union char_to_int64_t{ unsigned char c[8]; mpxp_int64_t i;} fix16k;
 unsigned long pb_phys_base,pm_valid;

 if(pds_mswin_getver()!=0)
  return 0;

 newfunc_cpu_init();

 if(!(mpxplay_cpu_capables_std&CPU_X86_STDCAP_MSR) || !(mpxplay_cpu_capables_std&CPU_X86_STDCAP_MTRR))
  return 0;

 pds_cpu_mtrr_read(MTRR_REG_CAP,&hilo);
 hi=hilo>>32;
 lo=hilo&0xffffffff;
 mtrr_var_cnt=lo&0xff;
#ifdef MTRR_DEBUG
 fprintf(stdout,"cap: %8.8X %8.8X cnt:%d psy_s:%2X\n",lo,hi,mtrr_var_cnt,phys_base_ptr_shifted);
#endif
 if(!(lo&0x400) || !(lo&0x100)) // WC and fixMTRR modes are supported?
  return 0;

 //size_kb=(size_kb+4095)&(~4095); // ??? page aligned (Causeway works on this way only)

 if(phys_base_ptr_shifted==0xA0){  // if A0000h memory area used
  pds_cpu_mtrr_read(MTRR_REG_FIX16K_A0000,&fix16k.i); // BC000-B8000-B4000-B0000-AC000-A8000-A4000-A0000
  for(i=0; i<8; i++){              // for 16kB block 0-7
   if(i<(size_kb/16))              // limit by area size
    fix16k.c[i]=mode;
  }
  pds_cpu_mtrr_write(MTRR_REG_FIX16K_A0000,fix16k.i); // write modified MSR
  return(1);
 }

 for(i=0;i<mtrr_var_cnt;i++){
  pds_cpu_mtrr_read(MTRR_REG_PHYSBASE(i),&mtrr_var_pb);
  pds_cpu_mtrr_read(MTRR_REG_PHYSMASK(i),&mtrr_var_pm);
  pb_phys_base=MTRR_GET_PB_PHYS_BASE(mtrr_var_pb);
  pm_valid=MTRR_GET_PM_VALID(mtrr_var_pm);
#ifdef MTRR_DEBUG
  fprintf(stdout,"%d. %8.8X %8.8X %8.8X %8.8X \n",i,(unsigned long)(mtrr_var_pb>>32),(unsigned long)(mtrr_var_pb&0xffffffff),
   (unsigned long)(mtrr_var_pm>>32),(unsigned long)(mtrr_var_pm&0xffffffff));
#endif
  if(pb_phys_base==phys_base_ptr_shifted){ // MTRR is allready set for our PB
   index=i;
   break;
  }
  if(!pm_valid && (index<0))
   index=i;
 }
 if(index<0) // no free MTRR found
  return 0;

 ENTER_CRITICAL;

 pds_cpu_mtrr_cache_disable();

 //update and write back mtrr info
 mtrr_var_pb=MTRR_PUT_PB_MODE(mtrr_var_pb,mode);
 mtrr_var_pb=MTRR_PUT_PB_PHYS_BASE(mtrr_var_pb,phys_base_ptr_shifted);
 pds_cpu_mtrr_write(MTRR_REG_PHYSBASE(index),mtrr_var_pb);
 mtrr_var_pm=MTRR_PUT_PM_VALID(mtrr_var_pm,((size_kb)? 1:0));
 mtrr_var_pm=MTRR_PUT_PM_PHYS_MASK(mtrr_var_pm,(~(phys_base_ptr_shifted^(phys_base_ptr_shifted+(size_kb>>2)-1)))&0xFFFFFF);
 pds_cpu_mtrr_write(MTRR_REG_PHYSMASK(index),mtrr_var_pm);

#ifdef MTRR_DEBUG
 pds_cpu_mtrr_read(MTRR_REG_DEFTYPE,&hilo);
 fprintf(stdout,"deftype old %8.8X %8.8X \n",(unsigned long)(hilo>>32),(unsigned long)(hilo&0xffffffff));
#endif

 //set page attribute table
 if((mpxplay_cpu_capables_std&CPU_X86_STDCAP_PAT) && (index<8)){
  pds_cpu_mtrr_read(MTRR_REG_PAT,&hilo);
  hilo=MTRR_PUT_PAT(hilo,index,mode);
  pds_cpu_mtrr_write(MTRR_REG_PAT,hilo);
 }

 //enable mtrr's
 if(mode)
  mtrr_deftype|=0x800;
 pds_cpu_mtrr_cache_enable();

 LEAVE_CRITICAL;

#ifdef MTRR_DEBUG
 pds_cpu_mtrr_read(MTRR_REG_DEFTYPE,&hilo);
 fprintf(stdout,"deftype new %8.8X %8.8X \n",(unsigned long)(hilo>>32),(unsigned long)(hilo&0xffffffff));
 fprintf(stdout,"index: %d pb_phys_base:%8.8X pm_valid:%d\n",index,pb_phys_base,pm_valid);
 fprintf(stdout,"w: %8.8X %8.8X %8.8X %8.8X \n",(unsigned long)(mtrr_var_pb>>32),(unsigned long)(mtrr_var_pb&0xffffffff),
   (unsigned long)(mtrr_var_pm>>32),(unsigned long)(mtrr_var_pm&0xffffffff));
 pds_cpu_mtrr_read(MTRR_REG_PHYSBASE(index),&mtrr_var_pb);
 pds_cpu_mtrr_read(MTRR_REG_PHYSMASK(index),&mtrr_var_pm);
 fprintf(stdout,"r: %8.8X %8.8X %8.8X %8.8X \n",(unsigned long)(mtrr_var_pb>>32),(unsigned long)(mtrr_var_pb&0xffffffff),
   (unsigned long)(mtrr_var_pm>>32),(unsigned long)(mtrr_var_pm&0xffffffff));
#endif

 return 1;
#else
 return 0;
#endif
}

unsigned int pds_cpu_mtrr_enable_wc(unsigned long phys_ptr,unsigned long size_kb)
{
#ifdef __DOS__
 return pds_cpu_mtrr_setmode(phys_ptr,size_kb,MTRR_MODE_WC);
#endif
}

void pds_cpu_mtrr_disable_wc(unsigned long phys_ptr)
{
#ifdef __DOS__
 pds_cpu_mtrr_setmode(phys_ptr,0,MTRR_MODE_UC);
#endif
}

//--------------------------------------------------------------------------
// FPU settings
void asm_fpu_setround_near(unsigned int *);

void pds_fpu_setround_near(void)
{
 unsigned int controlword;
#ifdef __WATCOMC__
 #pragma aux asm_fpu_setround_near=\
  "fstcw word ptr [eax]"\
  "and word ptr [eax],0xf3ff"\
  "fldcw word ptr [eax]"\
  parm[eax] modify[];
 asm_fpu_setround_near(&controlword);
#endif
}

void asm_fpu_setround_chop(unsigned int *);

void pds_fpu_setround_chop(void)
{
 unsigned int controlword;
#ifdef __WATCOMC__
 #pragma aux asm_fpu_setround_chop=\
  "fstcw word ptr [eax]"\
  "or word ptr [eax],0x0c00"\
  "fldcw word ptr [eax]"\
  parm[eax] modify[];
 asm_fpu_setround_chop(&controlword);
#endif
}
