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kernel/linux-imx6_3.14.28/arch/powerpc/kvm/fpu.S 5.74 KB
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  /*
   *  FPU helper code to use FPU operations from inside the kernel
   *
   *    Copyright (C) 2010 Alexander Graf (agraf@suse.de)
   *
   *  This program is free software; you can redistribute it and/or
   *  modify it under the terms of the GNU General Public License
   *  as published by the Free Software Foundation; either version
   *  2 of the License, or (at your option) any later version.
   *
   */
  
  #include <asm/reg.h>
  #include <asm/page.h>
  #include <asm/mmu.h>
  #include <asm/pgtable.h>
  #include <asm/cputable.h>
  #include <asm/cache.h>
  #include <asm/thread_info.h>
  #include <asm/ppc_asm.h>
  #include <asm/asm-offsets.h>
  
  /* Instructions operating on single parameters */
  
  /*
   * Single operation with one input operand
   *
   * R3 = (double*)&fpscr
   * R4 = (short*)&result
   * R5 = (short*)&param1
   */
  #define FPS_ONE_IN(name) 					\
  _GLOBAL(fps_ ## name);							\
  	lfd	0,0(r3);		/* load up fpscr value */	\
  	MTFSF_L(0);							\
  	lfs	0,0(r5);						\
  									\
  	name	0,0;							\
  									\
  	stfs	0,0(r4);						\
  	mffs	0;							\
  	stfd	0,0(r3);	/* save new fpscr value */	\
  	blr
  
  /*
   * Single operation with two input operands
   *
   * R3 = (double*)&fpscr
   * R4 = (short*)&result
   * R5 = (short*)&param1
   * R6 = (short*)&param2
   */
  #define FPS_TWO_IN(name) 					\
  _GLOBAL(fps_ ## name);							\
  	lfd	0,0(r3);		/* load up fpscr value */	\
  	MTFSF_L(0);							\
  	lfs	0,0(r5);						\
  	lfs	1,0(r6);						\
  									\
  	name	0,0,1;							\
  									\
  	stfs	0,0(r4);						\
  	mffs	0;							\
  	stfd	0,0(r3);		/* save new fpscr value */	\
  	blr
  
  /*
   * Single operation with three input operands
   *
   * R3 = (double*)&fpscr
   * R4 = (short*)&result
   * R5 = (short*)&param1
   * R6 = (short*)&param2
   * R7 = (short*)&param3
   */
  #define FPS_THREE_IN(name) 					\
  _GLOBAL(fps_ ## name);							\
  	lfd	0,0(r3);		/* load up fpscr value */	\
  	MTFSF_L(0);							\
  	lfs	0,0(r5);						\
  	lfs	1,0(r6);						\
  	lfs	2,0(r7);						\
  									\
  	name	0,0,1,2;						\
  									\
  	stfs	0,0(r4);						\
  	mffs	0;							\
  	stfd	0,0(r3);		/* save new fpscr value */	\
  	blr
  
  FPS_ONE_IN(fres)
  FPS_ONE_IN(frsqrte)
  FPS_ONE_IN(fsqrts)
  FPS_TWO_IN(fadds)
  FPS_TWO_IN(fdivs)
  FPS_TWO_IN(fmuls)
  FPS_TWO_IN(fsubs)
  FPS_THREE_IN(fmadds)
  FPS_THREE_IN(fmsubs)
  FPS_THREE_IN(fnmadds)
  FPS_THREE_IN(fnmsubs)
  FPS_THREE_IN(fsel)
  
  
  /* Instructions operating on double parameters */
  
  /*
   * Beginning of double instruction processing
   *
   * R3 = (double*)&fpscr
   * R4 = (u32*)&cr
   * R5 = (double*)&result
   * R6 = (double*)&param1
   * R7 = (double*)&param2 [load_two]
   * R8 = (double*)&param3 [load_three]
   * LR = instruction call function
   */
  fpd_load_three:
  	lfd	2,0(r8)			/* load param3 */
  fpd_load_two:
  	lfd	1,0(r7)			/* load param2 */
  fpd_load_one:
  	lfd	0,0(r6)			/* load param1 */
  fpd_load_none:
  	lfd	3,0(r3)			/* load up fpscr value */
  	MTFSF_L(3)
  	lwz	r6, 0(r4)		/* load cr */
  	mtcr	r6
  	blr
  
  /*
   * End of double instruction processing
   *
   * R3 = (double*)&fpscr
   * R4 = (u32*)&cr
   * R5 = (double*)&result
   * LR = caller of instruction call function
   */
  fpd_return:
  	mfcr	r6
  	stfd	0,0(r5)			/* save result */
  	mffs	0
  	stfd	0,0(r3)			/* save new fpscr value */
  	stw	r6,0(r4)		/* save new cr value */
  	blr
  
  /*
   * Double operation with no input operand
   *
   * R3 = (double*)&fpscr
   * R4 = (u32*)&cr
   * R5 = (double*)&result
   */
  #define FPD_NONE_IN(name) 						\
  _GLOBAL(fpd_ ## name);							\
  	mflr	r12;							\
  	bl	fpd_load_none;						\
  	mtlr	r12;							\
  									\
  	name.	0;			/* call instruction */		\
  	b	fpd_return
  
  /*
   * Double operation with one input operand
   *
   * R3 = (double*)&fpscr
   * R4 = (u32*)&cr
   * R5 = (double*)&result
   * R6 = (double*)&param1
   */
  #define FPD_ONE_IN(name) 						\
  _GLOBAL(fpd_ ## name);							\
  	mflr	r12;							\
  	bl	fpd_load_one;						\
  	mtlr	r12;							\
  									\
  	name.	0,0;			/* call instruction */		\
  	b	fpd_return
  
  /*
   * Double operation with two input operands
   *
   * R3 = (double*)&fpscr
   * R4 = (u32*)&cr
   * R5 = (double*)&result
   * R6 = (double*)&param1
   * R7 = (double*)&param2
   * R8 = (double*)&param3
   */
  #define FPD_TWO_IN(name) 						\
  _GLOBAL(fpd_ ## name);							\
  	mflr	r12;							\
  	bl	fpd_load_two;						\
  	mtlr	r12;							\
  									\
  	name.	0,0,1;			/* call instruction */		\
  	b	fpd_return
  
  /*
   * CR Double operation with two input operands
   *
   * R3 = (double*)&fpscr
   * R4 = (u32*)&cr
   * R5 = (double*)&param1
   * R6 = (double*)&param2
   * R7 = (double*)&param3
   */
  #define FPD_TWO_IN_CR(name)						\
  _GLOBAL(fpd_ ## name);							\
  	lfd	1,0(r6);		/* load param2 */		\
  	lfd	0,0(r5);		/* load param1 */		\
  	lfd	3,0(r3);		/* load up fpscr value */	\
  	MTFSF_L(3);							\
  	lwz	r6, 0(r4);		/* load cr */			\
  	mtcr	r6;							\
  									\
  	name	0,0,1;			/* call instruction */		\
  	mfcr	r6;							\
  	mffs	0;							\
  	stfd	0,0(r3);		/* save new fpscr value */	\
  	stw	r6,0(r4);		/* save new cr value */		\
  	blr
  
  /*
   * Double operation with three input operands
   *
   * R3 = (double*)&fpscr
   * R4 = (u32*)&cr
   * R5 = (double*)&result
   * R6 = (double*)&param1
   * R7 = (double*)&param2
   * R8 = (double*)&param3
   */
  #define FPD_THREE_IN(name) 						\
  _GLOBAL(fpd_ ## name);							\
  	mflr	r12;							\
  	bl	fpd_load_three;						\
  	mtlr	r12;							\
  									\
  	name.	0,0,1,2;		/* call instruction */		\
  	b	fpd_return
  
  FPD_ONE_IN(fsqrts)
  FPD_ONE_IN(frsqrtes)
  FPD_ONE_IN(fres)
  FPD_ONE_IN(frsp)
  FPD_ONE_IN(fctiw)
  FPD_ONE_IN(fctiwz)
  FPD_ONE_IN(fsqrt)
  FPD_ONE_IN(fre)
  FPD_ONE_IN(frsqrte)
  FPD_ONE_IN(fneg)
  FPD_ONE_IN(fabs)
  FPD_TWO_IN(fadds)
  FPD_TWO_IN(fsubs)
  FPD_TWO_IN(fdivs)
  FPD_TWO_IN(fmuls)
  FPD_TWO_IN_CR(fcmpu)
  FPD_TWO_IN(fcpsgn)
  FPD_TWO_IN(fdiv)
  FPD_TWO_IN(fadd)
  FPD_TWO_IN(fmul)
  FPD_TWO_IN_CR(fcmpo)
  FPD_TWO_IN(fsub)
  FPD_THREE_IN(fmsubs)
  FPD_THREE_IN(fmadds)
  FPD_THREE_IN(fnmsubs)
  FPD_THREE_IN(fnmadds)
  FPD_THREE_IN(fsel)
  FPD_THREE_IN(fmsub)
  FPD_THREE_IN(fmadd)
  FPD_THREE_IN(fnmsub)
  FPD_THREE_IN(fnmadd)
  
  _GLOBAL(kvm_cvt_fd)
  	lfs	0,0(r3)
  	stfd	0,0(r4)
  	blr
  
  _GLOBAL(kvm_cvt_df)
  	lfd	0,0(r3)
  	stfs	0,0(r4)
  	blr