arch/ia64/kvm/kvm_minstate.h - pub/scm/linux/kernel/git/tj/wq - Git at Google

 /*
  *  kvm_minstate.h: min save macros
  *  Copyright (c) 2007, Intel Corporation.
  *
  *  Xuefei Xu (Anthony Xu) (Anthony.xu@intel.com)
  *  Xiantao Zhang (xiantao.zhang@intel.com)
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License along with
  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  * Place - Suite 330, Boston, MA 02111-1307 USA.
  *
  */


 #include <asm/asmmacro.h>
 #include <asm/types.h>
 #include <asm/kregs.h>
 #include <asm/kvm_host.h>

 #include "asm-offsets.h"

 #define KVM_MINSTATE_START_SAVE_MIN	     					\
 	mov ar.rsc = 0;/* set enforced lazy mode, pl 0, little-endian, loadrs=0 */\
 	;;									\
 	mov.m r28 = ar.rnat;                                  			\
 	addl r22 = VMM_RBS_OFFSET,r1;            /* compute base of RBS */	\
 	;;									\
 	lfetch.fault.excl.nt1 [r22];						\
 	addl r1 = KVM_STK_OFFSET-VMM_PT_REGS_SIZE, r1;  \
 	mov r23 = ar.bspstore;			/* save ar.bspstore */          \
 	;;									\
 	mov ar.bspstore = r22;				/* switch to kernel RBS */\
 	;;									\
 	mov r18 = ar.bsp;							\
 	mov ar.rsc = 0x3;     /* set eager mode, pl 0, little-endian, loadrs=0 */


 #define KVM_MINSTATE_END_SAVE_MIN						\
 	bsw.1;          /* switch back to bank 1 (must be last in insn group) */\
 	;;


 #define PAL_VSA_SYNC_READ						\
 	/* begin to call pal vps sync_read */				\
 {.mii;									\
 	add r25 = VMM_VPD_BASE_OFFSET, r21;				\
 	nop 0x0;							\
 	mov r24=ip;							\
 	;;								\
 }									\
 {.mmb									\
 	add r24=0x20, r24;						\
 	ld8 r25 = [r25];      /* read vpd base */			\
 	br.cond.sptk kvm_vps_sync_read;		/*call the service*/	\
 	;;								\
 };									\


 #define KVM_MINSTATE_GET_CURRENT(reg)   mov reg=r21

 /*
  * KVM_DO_SAVE_MIN switches to the kernel stacks (if necessary) and saves
  * the minimum state necessary that allows us to turn psr.ic back
  * on.
  *
  * Assumed state upon entry:
  *  psr.ic: off
  *  r31:	contains saved predicates (pr)
  *
  * Upon exit, the state is as follows:
  *  psr.ic: off
  *   r2 = points to &pt_regs.r16
  *   r8 = contents of ar.ccv
  *   r9 = contents of ar.csd
  *  r10 = contents of ar.ssd
  *  r11 = FPSR_DEFAULT
  *  r12 = kernel sp (kernel virtual address)
  *  r13 = points to current task_struct (kernel virtual address)
  *  p15 = TRUE if psr.i is set in cr.ipsr
  *  predicate registers (other than p2, p3, and p15), b6, r3, r14, r15:
  *	  preserved
  *
  * Note that psr.ic is NOT turned on by this macro.  This is so that
  * we can pass interruption state as arguments to a handler.
  */


 #define PT(f) (VMM_PT_REGS_##f##_OFFSET)

 #define KVM_DO_SAVE_MIN(COVER,SAVE_IFS,EXTRA)			\
 	KVM_MINSTATE_GET_CURRENT(r16);  /* M (or M;;I) */	\
 	mov r27 = ar.rsc;         /* M */			\
 	mov r20 = r1;         /* A */				\
 	mov r25 = ar.unat;        /* M */			\
 	mov r29 = cr.ipsr;        /* M */			\
 	mov r26 = ar.pfs;         /* I */			\
 	mov r18 = cr.isr;         				\
 	COVER;              /* B;; (or nothing) */		\
 	;;							\
 	tbit.z p0,p15 = r29,IA64_PSR_I_BIT;			\
 	mov r1 = r16;						\
 /*	mov r21=r16;	*/					\
 	/* switch from user to kernel RBS: */			\
 	;;							\
 	invala;             /* M */				\
 	SAVE_IFS;						\
 	;;							\
 	KVM_MINSTATE_START_SAVE_MIN				\
 	adds r17 = 2*L1_CACHE_BYTES,r1;/* cache-line size */	\
 	adds r16 = PT(CR_IPSR),r1;				\
 	;;							\
 	lfetch.fault.excl.nt1 [r17],L1_CACHE_BYTES;		\
 	st8 [r16] = r29;      /* save cr.ipsr */		\
 	;;							\
 	lfetch.fault.excl.nt1 [r17];				\
 	tbit.nz p15,p0 = r29,IA64_PSR_I_BIT;			\
 	mov r29 = b0						\
 	;;							\
 	adds r16 = PT(R8),r1; /* initialize first base pointer */\
 	adds r17 = PT(R9),r1; /* initialize second base pointer */\
 	;;							\
 .mem.offset 0,0; st8.spill [r16] = r8,16;			\
 .mem.offset 8,0; st8.spill [r17] = r9,16;			\
 	;;							\
 .mem.offset 0,0; st8.spill [r16] = r10,24;			\
 .mem.offset 8,0; st8.spill [r17] = r11,24;			\
 	;;							\
 	mov r9 = cr.iip;         /* M */			\
 	mov r10 = ar.fpsr;        /* M */			\
 	;;							\
 	st8 [r16] = r9,16;    /* save cr.iip */			\
 	st8 [r17] = r30,16;   /* save cr.ifs */			\
 	sub r18 = r18,r22;    /* r18=RSE.ndirty*8 */		\
 	;;							\
 	st8 [r16] = r25,16;   /* save ar.unat */		\
 	st8 [r17] = r26,16;    /* save ar.pfs */		\
 	shl r18 = r18,16;     /* calu ar.rsc used for "loadrs" */\
 	;;							\
 	st8 [r16] = r27,16;   /* save ar.rsc */			\
 	st8 [r17] = r28,16;   /* save ar.rnat */		\
 	;;          /* avoid RAW on r16 & r17 */		\
 	st8 [r16] = r23,16;   /* save ar.bspstore */		\
 	st8 [r17] = r31,16;   /* save predicates */		\
 	;;							\
 	st8 [r16] = r29,16;   /* save b0 */			\
 	st8 [r17] = r18,16;   /* save ar.rsc value for "loadrs" */\
 	;;							\
 .mem.offset 0,0; st8.spill [r16] = r20,16;/* save original r1 */  \
 .mem.offset 8,0; st8.spill [r17] = r12,16;			\
 	adds r12 = -16,r1;    /* switch to kernel memory stack */  \
 	;;							\
 .mem.offset 0,0; st8.spill [r16] = r13,16;			\
 .mem.offset 8,0; st8.spill [r17] = r10,16;	/* save ar.fpsr */\
 	mov r13 = r21;   /* establish `current' */		\
 	;;							\
 .mem.offset 0,0; st8.spill [r16] = r15,16;			\
 .mem.offset 8,0; st8.spill [r17] = r14,16;			\
 	;;							\
 .mem.offset 0,0; st8.spill [r16] = r2,16;			\
 .mem.offset 8,0; st8.spill [r17] = r3,16;			\
 	adds r2 = VMM_PT_REGS_R16_OFFSET,r1;			\
 	 ;;							\
 	adds r16 = VMM_VCPU_IIPA_OFFSET,r13;			\
 	adds r17 = VMM_VCPU_ISR_OFFSET,r13;			\
 	mov r26 = cr.iipa;					\
 	mov r27 = cr.isr;					\
 	;;							\
 	st8 [r16] = r26;					\
 	st8 [r17] = r27;					\
 	;;							\
 	EXTRA;							\
 	mov r8 = ar.ccv;					\
 	mov r9 = ar.csd;					\
 	mov r10 = ar.ssd;					\
 	movl r11 = FPSR_DEFAULT;   /* L-unit */			\
 	adds r17 = VMM_VCPU_GP_OFFSET,r13;			\
 	;;							\
 	ld8 r1 = [r17];/* establish kernel global pointer */	\
 	;;							\
 	PAL_VSA_SYNC_READ					\
 	KVM_MINSTATE_END_SAVE_MIN

 /*
  * SAVE_REST saves the remainder of pt_regs (with psr.ic on).
  *
  * Assumed state upon entry:
  *  psr.ic: on
  *  r2: points to &pt_regs.f6
  *  r3: points to &pt_regs.f7
  *  r8: contents of ar.ccv
  *  r9: contents of ar.csd
  *  r10:	contents of ar.ssd
  *  r11:	FPSR_DEFAULT
  *
  * Registers r14 and r15 are guaranteed not to be touched by SAVE_REST.
  */
 #define KVM_SAVE_REST				\
 .mem.offset 0,0; st8.spill [r2] = r16,16;	\
 .mem.offset 8,0; st8.spill [r3] = r17,16;	\
 	;;				\
 .mem.offset 0,0; st8.spill [r2] = r18,16;	\
 .mem.offset 8,0; st8.spill [r3] = r19,16;	\
 	;;				\
 .mem.offset 0,0; st8.spill [r2] = r20,16;	\
 .mem.offset 8,0; st8.spill [r3] = r21,16;	\
 	mov r18=b6;			\
 	;;				\
 .mem.offset 0,0; st8.spill [r2] = r22,16;	\
 .mem.offset 8,0; st8.spill [r3] = r23,16;	\
 	mov r19 = b7;				\
 	;;					\
 .mem.offset 0,0; st8.spill [r2] = r24,16;	\
 .mem.offset 8,0; st8.spill [r3] = r25,16;	\
 	;;					\
 .mem.offset 0,0; st8.spill [r2] = r26,16;	\
 .mem.offset 8,0; st8.spill [r3] = r27,16;	\
 	;;					\
 .mem.offset 0,0; st8.spill [r2] = r28,16;	\
 .mem.offset 8,0; st8.spill [r3] = r29,16;	\
 	;;					\
 .mem.offset 0,0; st8.spill [r2] = r30,16;	\
 .mem.offset 8,0; st8.spill [r3] = r31,32;	\
 	;;					\
 	mov ar.fpsr = r11;			\
 	st8 [r2] = r8,8;			\
 	adds r24 = PT(B6)-PT(F7),r3;		\
 	adds r25 = PT(B7)-PT(F7),r3;		\
 	;;					\
 	st8 [r24] = r18,16;       /* b6 */	\
 	st8 [r25] = r19,16;       /* b7 */	\
 	adds r2 = PT(R4)-PT(F6),r2;		\
 	adds r3 = PT(R5)-PT(F7),r3;		\
 	;;					\
 	st8 [r24] = r9;	/* ar.csd */		\
 	st8 [r25] = r10;	/* ar.ssd */	\
 	;;					\
 	mov r18 = ar.unat;			\
 	adds r19 = PT(EML_UNAT)-PT(R4),r2;	\
 	;;					\
 	st8 [r19] = r18; /* eml_unat */ 	\


 #define KVM_SAVE_EXTRA				\
 .mem.offset 0,0; st8.spill [r2] = r4,16;	\
 .mem.offset 8,0; st8.spill [r3] = r5,16;	\
 	;;					\
 .mem.offset 0,0; st8.spill [r2] = r6,16;	\
 .mem.offset 8,0; st8.spill [r3] = r7;		\
 	;;					\
 	mov r26 = ar.unat;			\
 	;;					\
 	st8 [r2] = r26;/* eml_unat */ 		\

 #define KVM_SAVE_MIN_WITH_COVER		KVM_DO_SAVE_MIN(cover, mov r30 = cr.ifs,)
 #define KVM_SAVE_MIN_WITH_COVER_R19	KVM_DO_SAVE_MIN(cover, mov r30 = cr.ifs, mov r15 = r19)
 #define KVM_SAVE_MIN			KVM_DO_SAVE_MIN(     , mov r30 = r0, )
	/*
	* kvm_minstate.h: min save macros
	* Copyright (c) 2007, Intel Corporation.
	*
	* Xuefei Xu (Anthony Xu) (Anthony.xu@intel.com)
	* Xiantao Zhang (xiantao.zhang@intel.com)
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License along with
	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	* Place - Suite 330, Boston, MA 02111-1307 USA.
	*
	*/


	#include <asm/asmmacro.h>
	#include <asm/types.h>
	#include <asm/kregs.h>
	#include <asm/kvm_host.h>

	#include "asm-offsets.h"

	#define KVM_MINSTATE_START_SAVE_MIN \
	mov ar.rsc = 0;/* set enforced lazy mode, pl 0, little-endian, loadrs=0 */\
	;; \
	mov.m r28 = ar.rnat; \
	addl r22 = VMM_RBS_OFFSET,r1; /* compute base of RBS */ \
	;; \
	lfetch.fault.excl.nt1 [r22]; \
	addl r1 = KVM_STK_OFFSET-VMM_PT_REGS_SIZE, r1; \
	mov r23 = ar.bspstore; /* save ar.bspstore */ \
	;; \
	mov ar.bspstore = r22; /* switch to kernel RBS */\
	;; \
	mov r18 = ar.bsp; \
	mov ar.rsc = 0x3; /* set eager mode, pl 0, little-endian, loadrs=0 */



	#define KVM_MINSTATE_END_SAVE_MIN \
	bsw.1; /* switch back to bank 1 (must be last in insn group) */\
	;;


	#define PAL_VSA_SYNC_READ \
	/* begin to call pal vps sync_read */ \
	{.mii; \
	add r25 = VMM_VPD_BASE_OFFSET, r21; \
	nop 0x0; \
	mov r24=ip; \
	;; \
	} \
	{.mmb \
	add r24=0x20, r24; \
	ld8 r25 = [r25]; /* read vpd base */ \
	br.cond.sptk kvm_vps_sync_read; /call the service/ \
	;; \
	}; \


	#define KVM_MINSTATE_GET_CURRENT(reg) mov reg=r21

	/*
	* KVM_DO_SAVE_MIN switches to the kernel stacks (if necessary) and saves
	* the minimum state necessary that allows us to turn psr.ic back
	* on.
	*
	* Assumed state upon entry:
	* psr.ic: off
	* r31: contains saved predicates (pr)
	*
	* Upon exit, the state is as follows:
	* psr.ic: off
	* r2 = points to &pt_regs.r16
	* r8 = contents of ar.ccv
	* r9 = contents of ar.csd
	* r10 = contents of ar.ssd
	* r11 = FPSR_DEFAULT
	* r12 = kernel sp (kernel virtual address)
	* r13 = points to current task_struct (kernel virtual address)
	* p15 = TRUE if psr.i is set in cr.ipsr
	* predicate registers (other than p2, p3, and p15), b6, r3, r14, r15:
	* preserved
	*
	* Note that psr.ic is NOT turned on by this macro. This is so that
	* we can pass interruption state as arguments to a handler.
	*/


	#define PT(f) (VMM_PT_REGS_##f##_OFFSET)

	#define KVM_DO_SAVE_MIN(COVER,SAVE_IFS,EXTRA) \
	KVM_MINSTATE_GET_CURRENT(r16); /* M (or M;;I) */ \
	mov r27 = ar.rsc; /* M */ \
	mov r20 = r1; /* A */ \
	mov r25 = ar.unat; /* M */ \
	mov r29 = cr.ipsr; /* M */ \
	mov r26 = ar.pfs; /* I */ \
	mov r18 = cr.isr; \
	COVER; /* B;; (or nothing) */ \
	;; \
	tbit.z p0,p15 = r29,IA64_PSR_I_BIT; \
	mov r1 = r16; \
	/* mov r21=r16; */ \
	/* switch from user to kernel RBS: */ \
	;; \
	invala; /* M */ \
	SAVE_IFS; \
	;; \
	KVM_MINSTATE_START_SAVE_MIN \
	adds r17 = 2L1_CACHE_BYTES,r1;/ cache-line size */ \
	adds r16 = PT(CR_IPSR),r1; \
	;; \
	lfetch.fault.excl.nt1 [r17],L1_CACHE_BYTES; \
	st8 [r16] = r29; /* save cr.ipsr */ \
	;; \
	lfetch.fault.excl.nt1 [r17]; \
	tbit.nz p15,p0 = r29,IA64_PSR_I_BIT; \
	mov r29 = b0 \
	;; \
	adds r16 = PT(R8),r1; /* initialize first base pointer */\
	adds r17 = PT(R9),r1; /* initialize second base pointer */\
	;; \
	.mem.offset 0,0; st8.spill [r16] = r8,16; \
	.mem.offset 8,0; st8.spill [r17] = r9,16; \
	;; \
	.mem.offset 0,0; st8.spill [r16] = r10,24; \
	.mem.offset 8,0; st8.spill [r17] = r11,24; \
	;; \
	mov r9 = cr.iip; /* M */ \
	mov r10 = ar.fpsr; /* M */ \
	;; \
	st8 [r16] = r9,16; /* save cr.iip */ \
	st8 [r17] = r30,16; /* save cr.ifs */ \
	sub r18 = r18,r22; /* r18=RSE.ndirty8 / \
	;; \
	st8 [r16] = r25,16; /* save ar.unat */ \
	st8 [r17] = r26,16; /* save ar.pfs */ \
	shl r18 = r18,16; /* calu ar.rsc used for "loadrs" */\
	;; \
	st8 [r16] = r27,16; /* save ar.rsc */ \
	st8 [r17] = r28,16; /* save ar.rnat */ \
	;; /* avoid RAW on r16 & r17 */ \
	st8 [r16] = r23,16; /* save ar.bspstore */ \
	st8 [r17] = r31,16; /* save predicates */ \
	;; \
	st8 [r16] = r29,16; /* save b0 */ \
	st8 [r17] = r18,16; /* save ar.rsc value for "loadrs" */\
	;; \
	.mem.offset 0,0; st8.spill [r16] = r20,16;/* save original r1 */ \
	.mem.offset 8,0; st8.spill [r17] = r12,16; \
	adds r12 = -16,r1; /* switch to kernel memory stack */ \
	;; \
	.mem.offset 0,0; st8.spill [r16] = r13,16; \
	.mem.offset 8,0; st8.spill [r17] = r10,16; /* save ar.fpsr */\
	mov r13 = r21; /* establish `current' */ \
	;; \
	.mem.offset 0,0; st8.spill [r16] = r15,16; \
	.mem.offset 8,0; st8.spill [r17] = r14,16; \
	;; \
	.mem.offset 0,0; st8.spill [r16] = r2,16; \
	.mem.offset 8,0; st8.spill [r17] = r3,16; \
	adds r2 = VMM_PT_REGS_R16_OFFSET,r1; \
	;; \
	adds r16 = VMM_VCPU_IIPA_OFFSET,r13; \
	adds r17 = VMM_VCPU_ISR_OFFSET,r13; \
	mov r26 = cr.iipa; \
	mov r27 = cr.isr; \
	;; \
	st8 [r16] = r26; \
	st8 [r17] = r27; \
	;; \
	EXTRA; \
	mov r8 = ar.ccv; \
	mov r9 = ar.csd; \
	mov r10 = ar.ssd; \
	movl r11 = FPSR_DEFAULT; /* L-unit */ \
	adds r17 = VMM_VCPU_GP_OFFSET,r13; \
	;; \
	ld8 r1 = [r17];/* establish kernel global pointer */ \
	;; \
	PAL_VSA_SYNC_READ \
	KVM_MINSTATE_END_SAVE_MIN

	/*
	* SAVE_REST saves the remainder of pt_regs (with psr.ic on).
	*
	* Assumed state upon entry:
	* psr.ic: on
	* r2: points to &pt_regs.f6
	* r3: points to &pt_regs.f7
	* r8: contents of ar.ccv
	* r9: contents of ar.csd
	* r10: contents of ar.ssd
	* r11: FPSR_DEFAULT
	*
	* Registers r14 and r15 are guaranteed not to be touched by SAVE_REST.
	*/
	#define KVM_SAVE_REST \
	.mem.offset 0,0; st8.spill [r2] = r16,16; \
	.mem.offset 8,0; st8.spill [r3] = r17,16; \
	;; \
	.mem.offset 0,0; st8.spill [r2] = r18,16; \
	.mem.offset 8,0; st8.spill [r3] = r19,16; \
	;; \
	.mem.offset 0,0; st8.spill [r2] = r20,16; \
	.mem.offset 8,0; st8.spill [r3] = r21,16; \
	mov r18=b6; \
	;; \
	.mem.offset 0,0; st8.spill [r2] = r22,16; \
	.mem.offset 8,0; st8.spill [r3] = r23,16; \
	mov r19 = b7; \
	;; \
	.mem.offset 0,0; st8.spill [r2] = r24,16; \
	.mem.offset 8,0; st8.spill [r3] = r25,16; \
	;; \
	.mem.offset 0,0; st8.spill [r2] = r26,16; \
	.mem.offset 8,0; st8.spill [r3] = r27,16; \
	;; \
	.mem.offset 0,0; st8.spill [r2] = r28,16; \
	.mem.offset 8,0; st8.spill [r3] = r29,16; \
	;; \
	.mem.offset 0,0; st8.spill [r2] = r30,16; \
	.mem.offset 8,0; st8.spill [r3] = r31,32; \
	;; \
	mov ar.fpsr = r11; \
	st8 [r2] = r8,8; \
	adds r24 = PT(B6)-PT(F7),r3; \
	adds r25 = PT(B7)-PT(F7),r3; \
	;; \
	st8 [r24] = r18,16; /* b6 */ \
	st8 [r25] = r19,16; /* b7 */ \
	adds r2 = PT(R4)-PT(F6),r2; \
	adds r3 = PT(R5)-PT(F7),r3; \
	;; \
	st8 [r24] = r9; /* ar.csd */ \
	st8 [r25] = r10; /* ar.ssd */ \
	;; \
	mov r18 = ar.unat; \
	adds r19 = PT(EML_UNAT)-PT(R4),r2; \
	;; \
	st8 [r19] = r18; /* eml_unat */ \


	#define KVM_SAVE_EXTRA \
	.mem.offset 0,0; st8.spill [r2] = r4,16; \
	.mem.offset 8,0; st8.spill [r3] = r5,16; \
	;; \
	.mem.offset 0,0; st8.spill [r2] = r6,16; \
	.mem.offset 8,0; st8.spill [r3] = r7; \
	;; \
	mov r26 = ar.unat; \
	;; \
	st8 [r2] = r26;/* eml_unat */ \

	#define KVM_SAVE_MIN_WITH_COVER KVM_DO_SAVE_MIN(cover, mov r30 = cr.ifs,)
	#define KVM_SAVE_MIN_WITH_COVER_R19 KVM_DO_SAVE_MIN(cover, mov r30 = cr.ifs, mov r15 = r19)
	#define KVM_SAVE_MIN KVM_DO_SAVE_MIN( , mov r30 = r0, )