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-rw-r--r--arch/ia64/kernel/minstate.h251
1 files changed, 251 insertions, 0 deletions
diff --git a/arch/ia64/kernel/minstate.h b/arch/ia64/kernel/minstate.h
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+++ b/arch/ia64/kernel/minstate.h
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+#include <linux/config.h>
+
+#include <asm/cache.h>
+
+#include "entry.h"
+
+/*
+ * For ivt.s we want to access the stack virtually so we don't have to disable translation
+ * on interrupts.
+ *
+ * On entry:
+ * r1: pointer to current task (ar.k6)
+ */
+#define MINSTATE_START_SAVE_MIN_VIRT \
+(pUStk) mov ar.rsc=0; /* set enforced lazy mode, pl 0, little-endian, loadrs=0 */ \
+ ;; \
+(pUStk) mov.m r24=ar.rnat; \
+(pUStk) addl r22=IA64_RBS_OFFSET,r1; /* compute base of RBS */ \
+(pKStk) mov r1=sp; /* get sp */ \
+ ;; \
+(pUStk) lfetch.fault.excl.nt1 [r22]; \
+(pUStk) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1; /* compute base of memory stack */ \
+(pUStk) mov r23=ar.bspstore; /* save ar.bspstore */ \
+ ;; \
+(pUStk) mov ar.bspstore=r22; /* switch to kernel RBS */ \
+(pKStk) addl r1=-IA64_PT_REGS_SIZE,r1; /* if in kernel mode, use sp (r12) */ \
+ ;; \
+(pUStk) mov r18=ar.bsp; \
+(pUStk) mov ar.rsc=0x3; /* set eager mode, pl 0, little-endian, loadrs=0 */
+
+#define MINSTATE_END_SAVE_MIN_VIRT \
+ bsw.1; /* switch back to bank 1 (must be last in insn group) */ \
+ ;;
+
+/*
+ * For mca_asm.S we want to access the stack physically since the state is saved before we
+ * go virtual and don't want to destroy the iip or ipsr.
+ */
+#define MINSTATE_START_SAVE_MIN_PHYS \
+(pKStk) mov r3=IA64_KR(PER_CPU_DATA);; \
+(pKStk) addl r3=THIS_CPU(ia64_mca_data),r3;; \
+(pKStk) ld8 r3 = [r3];; \
+(pKStk) addl r3=IA64_MCA_CPU_INIT_STACK_OFFSET,r3;; \
+(pKStk) addl sp=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r3; \
+(pUStk) mov ar.rsc=0; /* set enforced lazy mode, pl 0, little-endian, loadrs=0 */ \
+(pUStk) addl r22=IA64_RBS_OFFSET,r1; /* compute base of register backing store */ \
+ ;; \
+(pUStk) mov r24=ar.rnat; \
+(pUStk) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1; /* compute base of memory stack */ \
+(pUStk) mov r23=ar.bspstore; /* save ar.bspstore */ \
+(pUStk) dep r22=-1,r22,61,3; /* compute kernel virtual addr of RBS */ \
+ ;; \
+(pKStk) addl r1=-IA64_PT_REGS_SIZE,r1; /* if in kernel mode, use sp (r12) */ \
+(pUStk) mov ar.bspstore=r22; /* switch to kernel RBS */ \
+ ;; \
+(pUStk) mov r18=ar.bsp; \
+(pUStk) mov ar.rsc=0x3; /* set eager mode, pl 0, little-endian, loadrs=0 */ \
+
+#define MINSTATE_END_SAVE_MIN_PHYS \
+ dep r12=-1,r12,61,3; /* make sp a kernel virtual address */ \
+ ;;
+
+#ifdef MINSTATE_VIRT
+# define MINSTATE_GET_CURRENT(reg) mov reg=IA64_KR(CURRENT)
+# define MINSTATE_START_SAVE_MIN MINSTATE_START_SAVE_MIN_VIRT
+# define MINSTATE_END_SAVE_MIN MINSTATE_END_SAVE_MIN_VIRT
+#endif
+
+#ifdef MINSTATE_PHYS
+# define MINSTATE_GET_CURRENT(reg) mov reg=IA64_KR(CURRENT);; tpa reg=reg
+# define MINSTATE_START_SAVE_MIN MINSTATE_START_SAVE_MIN_PHYS
+# define MINSTATE_END_SAVE_MIN MINSTATE_END_SAVE_MIN_PHYS
+#endif
+
+/*
+ * 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 DO_SAVE_MIN(COVER,SAVE_IFS,EXTRA) \
+ 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 r28=cr.iip; /* M */ \
+ mov r21=ar.fpsr; /* M */ \
+ COVER; /* B;; (or nothing) */ \
+ ;; \
+ adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16; \
+ ;; \
+ ld1 r17=[r16]; /* load current->thread.on_ustack flag */ \
+ st1 [r16]=r0; /* clear current->thread.on_ustack flag */ \
+ adds r1=-IA64_TASK_THREAD_ON_USTACK_OFFSET,r16 \
+ /* switch from user to kernel RBS: */ \
+ ;; \
+ invala; /* M */ \
+ SAVE_IFS; \
+ cmp.eq pKStk,pUStk=r0,r17; /* are we in kernel mode already? */ \
+ ;; \
+ MINSTATE_START_SAVE_MIN \
+ adds r17=2*L1_CACHE_BYTES,r1; /* really: biggest 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 */ \
+(pKStk) mov r18=r0; /* make sure r18 isn't NaT */ \
+ ;; \
+.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; \
+ ;; \
+ st8 [r16]=r28,16; /* save cr.iip */ \
+ st8 [r17]=r30,16; /* save cr.ifs */ \
+(pUStk) sub r18=r18,r22; /* r18=RSE.ndirty*8 */ \
+ mov r8=ar.ccv; \
+ mov r9=ar.csd; \
+ mov r10=ar.ssd; \
+ movl r11=FPSR_DEFAULT; /* L-unit */ \
+ ;; \
+ st8 [r16]=r25,16; /* save ar.unat */ \
+ st8 [r17]=r26,16; /* save ar.pfs */ \
+ shl r18=r18,16; /* compute ar.rsc to be used for "loadrs" */ \
+ ;; \
+ st8 [r16]=r27,16; /* save ar.rsc */ \
+(pUStk) st8 [r17]=r24,16; /* save ar.rnat */ \
+(pKStk) adds r17=16,r17; /* skip over ar_rnat field */ \
+ ;; /* avoid RAW on r16 & r17 */ \
+(pUStk) st8 [r16]=r23,16; /* save ar.bspstore */ \
+ st8 [r17]=r31,16; /* save predicates */ \
+(pKStk) adds r16=16,r16; /* skip over ar_bspstore field */ \
+ ;; \
+ st8 [r16]=r29,16; /* save b0 */ \
+ st8 [r17]=r18,16; /* save ar.rsc value for "loadrs" */ \
+ cmp.eq pNonSys,pSys=r0,r0 /* initialize pSys=0, pNonSys=1 */ \
+ ;; \
+.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 (with 16 bytes of scratch) */ \
+ ;; \
+.mem.offset 0,0; st8.spill [r16]=r13,16; \
+.mem.offset 8,0; st8.spill [r17]=r21,16; /* save ar.fpsr */ \
+ mov r13=IA64_KR(CURRENT); /* 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=IA64_PT_REGS_R16_OFFSET,r1; \
+ ;; \
+ EXTRA; \
+ movl r1=__gp; /* establish kernel global pointer */ \
+ ;; \
+ 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.r16
+ * r3: points to &pt_regs.r17
+ * 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 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; /* M-unit */ \
+ st8 [r2]=r8,8; /* ar.ccv */ \
+ adds r24=PT(B6)-PT(F7),r3; \
+ ;; \
+ stf.spill [r2]=f6,32; \
+ stf.spill [r3]=f7,32; \
+ ;; \
+ stf.spill [r2]=f8,32; \
+ stf.spill [r3]=f9,32; \
+ ;; \
+ stf.spill [r2]=f10; \
+ stf.spill [r3]=f11; \
+ adds r25=PT(B7)-PT(F11),r3; \
+ ;; \
+ st8 [r24]=r18,16; /* b6 */ \
+ st8 [r25]=r19,16; /* b7 */ \
+ ;; \
+ st8 [r24]=r9; /* ar.csd */ \
+ st8 [r25]=r10; /* ar.ssd */ \
+ ;;
+
+#define SAVE_MIN_WITH_COVER DO_SAVE_MIN(cover, mov r30=cr.ifs,)
+#define SAVE_MIN_WITH_COVER_R19 DO_SAVE_MIN(cover, mov r30=cr.ifs, mov r15=r19)
+#define SAVE_MIN DO_SAVE_MIN( , mov r30=r0, )
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