/** * @file IA64minstate.h * * @remark Copy of source code from linux kernel * @remark linux/arch/ia64/kernel/minstate.h * */ #include <linux/config.h> #include "IA64entry.h" /* * A couple of convenience macros that make writing and reading * SAVE_MIN and SAVE_REST easier. */ #define rARPR r31 #define rCRIFS r30 #define rCRIPSR r29 #define rCRIIP r28 #define rARRSC r27 #define rARPFS r26 #define rARUNAT r25 #define rARRNAT r24 #define rARBSPSTORE r23 #define rKRBS r22 #define rB6 r21 #define rR1 r20 /* * Here start the source dependent macros. */ /* * For ivt.s we want to access the stack virtually so we dont have * to disable translation on interrupts. */ #define MINSTATE_START_SAVE_MIN_VIRT \ /* r1 = current (virtual) */ \ dep r1=-1, r1, 61, 3; \ /* set enforced lazy mode, pl 0, little-endian, loadrs=0 */ \ (pUser) mov ar.rsc=0; \ ;; \ /* compute base of RBS */ \ (pUser) addl rKRBS=IA64_RBS_OFFSET, r1; \ (pUser) mov rARRNAT=ar.rnat; \ /* get sp */ \ (pKern) mov r1=sp; \ ;; \ /* compute base of memory stack */ \ (pUser) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE, r1; \ /* save ar.bspstore */ \ (pUser) mov rARBSPSTORE=ar.bspstore; \ ;; \ /* if in kernel mode, use sp (r12) */ \ (pKern) addl r1=-IA64_PT_REGS_SIZE, r1; \ /* switch to kernel RBS */ \ (pUser) mov ar.bspstore=rKRBS; \ ;; \ (pUser) mov r18=ar.bsp; \ /* set eager mode, pl 0, little-endian, loadrs=0 */ \ (pUser) mov ar.rsc=0x3; #define MINSTATE_END_SAVE_MIN_VIRT \ /* make `current' a kernel virtual address */ \ or r13=r13, r14; \ /* switch back to bank 1 (must be last in insn group) */ \ bsw.1; \ ;; /* * For mca_asm.S we want to access the stack physically since the state * is saved before we go virtual and dont want to destroy the iip or ipsr. */ #define MINSTATE_START_SAVE_MIN_PHYS \ (pKern) movl sp=ia64_init_stack+IA64_STK_OFFSET-IA64_PT_REGS_SIZE; \ /* set enforced lazy mode, pl 0, little-endian, loadrs=0 */ \ (pUser) mov ar.rsc=0; \ /* compute base of register backing store */ \ (pUser) addl rKRBS=IA64_RBS_OFFSET, r1; \ ;; \ (pUser) mov rARRNAT=ar.rnat; \ /* compute physical addr of sp */ \ (pKern) dep r1=0, sp, 61, 3; \ /* compute base of memory stack */ \ (pUser) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE, r1; \ /* save ar.bspstore */ \ (pUser) mov rARBSPSTORE=ar.bspstore; \ /* compute kernel virtual addr of RBS */ \ (pUser) dep rKRBS=-1, rKRBS, 61, 3; \ ;; \ /* if in kernel mode, use sp (r12) */ \ (pKern) addl r1=-IA64_PT_REGS_SIZE, r1; \ /* switch to kernel RBS */ \ (pUser) mov ar.bspstore=rKRBS; \ ;; \ (pUser) mov r18=ar.bsp; \ /* set eager mode, pl 0, little-endian, loadrs=0 */ \ (pUser) mov ar.rsc=0x3; #define MINSTATE_END_SAVE_MIN_PHYS \ /* make sp a kernel virtual address */ \ or r12=r12, r14; \ /* make `current' a kernel virtual address */ \ or r13=r13, r14; \ ;; #ifdef MINSTATE_VIRT # 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_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 * psr.dt: off * r31: contains saved predicates (pr) * * Upon exit, the state is as follows: * psr.ic: off * r2 = points to &pt_regs.r16 * 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, r8, r9, * r10, r11, 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) \ mov rARRSC=ar.rsc; \ mov rARPFS=ar.pfs; \ mov rR1=r1; \ mov rARUNAT=ar.unat; \ mov rCRIPSR=cr.ipsr; \ /* rB6 = branch reg 6 */ \ mov rB6=b6; \ mov rCRIIP=cr.iip; \ /* r1 = current (physical) */ \ mov r1=IA64_KR(CURRENT); \ COVER; \ ;; \ invala; \ /* extract psr.cpl */ \ extr.u r16=rCRIPSR, 32, 2; \ ;; \ /* are we in kernel mode already? (psr.cpl==0) */ \ cmp.eq pKern, pUser=r0, r16; \ /* switch from user to kernel RBS: */ \ ;; \ SAVE_IFS; \ MINSTATE_START_SAVE_MIN \ ;; \ /* initialize first base pointer */ \ mov r16=r1; \ /* initialize second base pointer */ \ adds r17=8, r1; \ ;; \ st8 [r16]=rCRIPSR, 16; /* save cr.ipsr */ \ st8 [r17]=rCRIIP, 16; /* save cr.iip */ \ (pKern) mov r18=r0; /* make sure r18 isn't NaT */ \ ;; \ st8 [r16]=rCRIFS, 16; /* save cr.ifs */ \ st8 [r17]=rARUNAT, 16; /* save ar.unat */ \ (pUser) sub r18=r18, rKRBS; /* r18=RSE.ndirty*8 */ \ ;; \ st8 [r16]=rARPFS, 16; /* save ar.pfs */ \ st8 [r17]=rARRSC, 16; /* save ar.rsc */ \ tbit.nz p15, p0=rCRIPSR, IA64_PSR_I_BIT \ ;; /* avoid RAW on r16 & r17 */ \ (pKern) adds r16=16, r16; /* skip over ar_rnat field */ \ (pKern) adds r17=16, r17; /* skip over ar_bspstore field */ \ (pUser) st8 [r16]=rARRNAT, 16; /* save ar.rnat */ \ (pUser) st8 [r17]=rARBSPSTORE, 16; /* save ar.bspstore */ \ ;; \ st8 [r16]=rARPR, 16; /* save predicates */ \ st8 [r17]=rB6, 16; /* save b6 */ \ /* compute ar.rsc to be used for "loadrs" */ \ shl r18=r18, 16; \ ;; \ st8 [r16]=r18, 16; /* save ar.rsc value for "loadrs" */ \ st8.spill [r17]=rR1, 16; /* save original r1 */ \ ;; \ .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; \ ;; \ .mem.offset 0, 0; st8.spill [r16]=r12, 16; \ .mem.offset 8, 0; st8.spill [r17]=r13, 16; \ /* initialize pSys=0, pNonSys=1 */ \ cmp.eq pNonSys, pSys=r0, r0 \ ;; \ .mem.offset 0, 0; st8.spill [r16]=r14, 16; \ .mem.offset 8, 0; st8.spill [r17]=r15, 16; \ dep r14=-1, r0, 61, 3; \ ;; \ .mem.offset 0, 0; st8.spill [r16]=r8, 16; \ .mem.offset 8, 0; st8.spill [r17]=r9, 16; \ /* switch to kernel memory stack (with 16 bytes of scratch) */ \ adds r12=-16, r1; \ ;; \ .mem.offset 0, 0; st8.spill [r16]=r10, 16; \ .mem.offset 8, 0; st8.spill [r17]=r11, 16; \ mov r13=IA64_KR(CURRENT); /* establish `current' */ \ ;; \ EXTRA; \ movl r1=__gp; /* establish kernel global pointer */ \ ;; \ MINSTATE_END_SAVE_MIN /* * SAVE_REST saves the remainder of pt_regs (with psr.ic on). This * macro guarantees to preserve all predicate registers, r8, r9, r10, * r11, r14, and r15. * * Assumed state upon entry: * psr.ic: on * psr.dt: on * r2: points to &pt_regs.r16 * r3: points to &pt_regs.r17 */ #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; \ ;; \ mov r16=ar.ccv; /* M-unit */ \ movl r18=FPSR_DEFAULT /* L-unit */ \ ;; \ mov r17=ar.fpsr; /* M-unit */ \ mov ar.fpsr=r18; /* M-unit */ \ ;; \ .mem.offset 0, 0; st8.spill [r2]=r20, 16; \ .mem.offset 8, 0; st8.spill [r3]=r21, 16; \ mov r18=b0; \ ;; \ .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, 16; \ ;; \ st8 [r2]=r16, 16; /* ar.ccv */ \ st8 [r3]=r17, 16; /* ar.fpsr */ \ ;; \ st8 [r2]=r18, 16; /* b0 */ \ st8 [r3]=r19, 16+8; /* b7 */ \ ;; \ stf.spill [r2]=f6, 32; \ stf.spill [r3]=f7, 32; \ ;; \ stf.spill [r2]=f8, 32; \ stf.spill [r3]=f9, 32 #define SAVE_MIN_WITH_COVER DO_SAVE_MIN(cover, mov rCRIFS=cr.ifs,) #define SAVE_MIN_WITH_COVER_R19 \ DO_SAVE_MIN(cover, mov rCRIFS=cr.ifs, mov r15=r19) #define SAVE_MIN DO_SAVE_MIN(, mov rCRIFS=r0,)