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Diffstat (limited to '')
| -rw-r--r-- | arch/ia64/kernel/minstate.h | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/arch/ia64/kernel/minstate.h b/arch/ia64/kernel/minstate.h new file mode 100644 index 000000000..d6eab2a10 --- /dev/null +++ b/arch/ia64/kernel/minstate.h @@ -0,0 +1,251 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include <asm/cache.h> + +#include "entry.h" +#include <asm/native/inst.h> + +#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE +/* read ar.itc in advance, and use it before leaving bank 0 */ +#define ACCOUNT_GET_STAMP \ +(pUStk) mov.m r20=ar.itc; +#define ACCOUNT_SYS_ENTER \ +(pUStk) br.call.spnt rp=account_sys_enter \ + ;; +#else +#define ACCOUNT_GET_STAMP +#define ACCOUNT_SYS_ENTER +#endif + +.section ".data..patch.rse", "a" +.previous + +/* + * 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 IA64_NATIVE_DO_SAVE_MIN(__COVER,SAVE_IFS,EXTRA,WORKAROUND) \ + mov r16=IA64_KR(CURRENT); /* M */ \ + mov r27=ar.rsc; /* M */ \ + mov r20=r1; /* A */ \ + mov r25=ar.unat; /* M */ \ + MOV_FROM_IPSR(p0,r29); /* M */ \ + mov r26=ar.pfs; /* I */ \ + MOV_FROM_IIP(r28); /* 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? */ \ + ;; \ +(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 */ \ + 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 \ + ;; \ + WORKAROUND; \ + 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; \ + ACCOUNT_GET_STAMP \ + adds r2=IA64_PT_REGS_R16_OFFSET,r1; \ + ;; \ + EXTRA; \ + movl r1=__gp; /* establish kernel global pointer */ \ + ;; \ + ACCOUNT_SYS_ENTER \ + bsw.1; /* switch back to bank 1 (must be last in insn group) */ \ + ;; + +/* + * 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 RSE_WORKAROUND \ +(pUStk) extr.u r17=r18,3,6; \ +(pUStk) sub r16=r18,r22; \ +[1:](pKStk) br.cond.sptk.many 1f; \ + .xdata4 ".data..patch.rse",1b-. \ + ;; \ + cmp.ge p6,p7 = 33,r17; \ + ;; \ +(p6) mov r17=0x310; \ +(p7) mov r17=0x308; \ + ;; \ + cmp.leu p1,p0=r16,r17; \ +(p1) br.cond.sptk.many 1f; \ + dep.z r17=r26,0,62; \ + movl r16=2f; \ + ;; \ + mov ar.pfs=r17; \ + dep r27=r0,r27,16,14; \ + mov b0=r16; \ + ;; \ + br.ret.sptk b0; \ + ;; \ +2: \ + mov ar.rsc=r0 \ + ;; \ + flushrs; \ + ;; \ + mov ar.bspstore=r22 \ + ;; \ + mov r18=ar.bsp; \ + ;; \ +1: \ + .pred.rel "mutex", pKStk, pUStk + +#define SAVE_MIN_WITH_COVER DO_SAVE_MIN(COVER, mov r30=cr.ifs, , RSE_WORKAROUND) +#define SAVE_MIN_WITH_COVER_R19 DO_SAVE_MIN(COVER, mov r30=cr.ifs, mov r15=r19, RSE_WORKAROUND) +#define SAVE_MIN DO_SAVE_MIN( , mov r30=r0, , ) |