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+/*
+ * File: mca_asm.h
+ * Purpose: Machine check handling specific defines
+ *
+ * Copyright (C) 1999 Silicon Graphics, Inc.
+ * Copyright (C) Vijay Chander <vijay@engr.sgi.com>
+ * Copyright (C) Srinivasa Thirumalachar <sprasad@engr.sgi.com>
+ * Copyright (C) 2000 Hewlett-Packard Co.
+ * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 2002 Intel Corp.
+ * Copyright (C) 2002 Jenna Hall <jenna.s.hall@intel.com>
+ * Copyright (C) 2005 Silicon Graphics, Inc
+ * Copyright (C) 2005 Keith Owens <kaos@sgi.com>
+ */
+#ifndef _ASM_IA64_MCA_ASM_H
+#define _ASM_IA64_MCA_ASM_H
+
+#include <asm/percpu.h>
+
+#define PSR_IC 13
+#define PSR_I 14
+#define PSR_DT 17
+#define PSR_RT 27
+#define PSR_MC 35
+#define PSR_IT 36
+#define PSR_BN 44
+
+/*
+ * This macro converts a instruction virtual address to a physical address
+ * Right now for simulation purposes the virtual addresses are
+ * direct mapped to physical addresses.
+ * 1. Lop off bits 61 thru 63 in the virtual address
+ */
+#define INST_VA_TO_PA(addr) \
+ dep addr = 0, addr, 61, 3
+/*
+ * This macro converts a data virtual address to a physical address
+ * Right now for simulation purposes the virtual addresses are
+ * direct mapped to physical addresses.
+ * 1. Lop off bits 61 thru 63 in the virtual address
+ */
+#define DATA_VA_TO_PA(addr) \
+ tpa addr = addr
+/*
+ * This macro converts a data physical address to a virtual address
+ * Right now for simulation purposes the virtual addresses are
+ * direct mapped to physical addresses.
+ * 1. Put 0x7 in bits 61 thru 63.
+ */
+#define DATA_PA_TO_VA(addr,temp) \
+ mov temp = 0x7 ;; \
+ dep addr = temp, addr, 61, 3
+
+#define GET_THIS_PADDR(reg, var) \
+ mov reg = IA64_KR(PER_CPU_DATA);; \
+ addl reg = THIS_CPU(var), reg
+
+/*
+ * This macro jumps to the instruction at the given virtual address
+ * and starts execution in physical mode with all the address
+ * translations turned off.
+ * 1. Save the current psr
+ * 2. Make sure that all the upper 32 bits are off
+ *
+ * 3. Clear the interrupt enable and interrupt state collection bits
+ * in the psr before updating the ipsr and iip.
+ *
+ * 4. Turn off the instruction, data and rse translation bits of the psr
+ * and store the new value into ipsr
+ * Also make sure that the interrupts are disabled.
+ * Ensure that we are in little endian mode.
+ * [psr.{rt, it, dt, i, be} = 0]
+ *
+ * 5. Get the physical address corresponding to the virtual address
+ * of the next instruction bundle and put it in iip.
+ * (Using magic numbers 24 and 40 in the deposint instruction since
+ * the IA64_SDK code directly maps to lower 24bits as physical address
+ * from a virtual address).
+ *
+ * 6. Do an rfi to move the values from ipsr to psr and iip to ip.
+ */
+#define PHYSICAL_MODE_ENTER(temp1, temp2, start_addr, old_psr) \
+ mov old_psr = psr; \
+ ;; \
+ dep old_psr = 0, old_psr, 32, 32; \
+ \
+ mov ar.rsc = 0 ; \
+ ;; \
+ srlz.d; \
+ mov temp2 = ar.bspstore; \
+ ;; \
+ DATA_VA_TO_PA(temp2); \
+ ;; \
+ mov temp1 = ar.rnat; \
+ ;; \
+ mov ar.bspstore = temp2; \
+ ;; \
+ mov ar.rnat = temp1; \
+ mov temp1 = psr; \
+ mov temp2 = psr; \
+ ;; \
+ \
+ dep temp2 = 0, temp2, PSR_IC, 2; \
+ ;; \
+ mov psr.l = temp2; \
+ ;; \
+ srlz.d; \
+ dep temp1 = 0, temp1, 32, 32; \
+ ;; \
+ dep temp1 = 0, temp1, PSR_IT, 1; \
+ ;; \
+ dep temp1 = 0, temp1, PSR_DT, 1; \
+ ;; \
+ dep temp1 = 0, temp1, PSR_RT, 1; \
+ ;; \
+ dep temp1 = 0, temp1, PSR_I, 1; \
+ ;; \
+ dep temp1 = 0, temp1, PSR_IC, 1; \
+ ;; \
+ dep temp1 = -1, temp1, PSR_MC, 1; \
+ ;; \
+ mov cr.ipsr = temp1; \
+ ;; \
+ LOAD_PHYSICAL(p0, temp2, start_addr); \
+ ;; \
+ mov cr.iip = temp2; \
+ mov cr.ifs = r0; \
+ DATA_VA_TO_PA(sp); \
+ DATA_VA_TO_PA(gp); \
+ ;; \
+ srlz.i; \
+ ;; \
+ nop 1; \
+ nop 2; \
+ nop 1; \
+ nop 2; \
+ rfi; \
+ ;;
+
+/*
+ * This macro jumps to the instruction at the given virtual address
+ * and starts execution in virtual mode with all the address
+ * translations turned on.
+ * 1. Get the old saved psr
+ *
+ * 2. Clear the interrupt state collection bit in the current psr.
+ *
+ * 3. Set the instruction translation bit back in the old psr
+ * Note we have to do this since we are right now saving only the
+ * lower 32-bits of old psr.(Also the old psr has the data and
+ * rse translation bits on)
+ *
+ * 4. Set ipsr to this old_psr with "it" bit set and "bn" = 1.
+ *
+ * 5. Reset the current thread pointer (r13).
+ *
+ * 6. Set iip to the virtual address of the next instruction bundle.
+ *
+ * 7. Do an rfi to move ipsr to psr and iip to ip.
+ */
+
+#define VIRTUAL_MODE_ENTER(temp1, temp2, start_addr, old_psr) \
+ mov temp2 = psr; \
+ ;; \
+ mov old_psr = temp2; \
+ ;; \
+ dep temp2 = 0, temp2, PSR_IC, 2; \
+ ;; \
+ mov psr.l = temp2; \
+ mov ar.rsc = 0; \
+ ;; \
+ srlz.d; \
+ mov r13 = ar.k6; \
+ mov temp2 = ar.bspstore; \
+ ;; \
+ DATA_PA_TO_VA(temp2,temp1); \
+ ;; \
+ mov temp1 = ar.rnat; \
+ ;; \
+ mov ar.bspstore = temp2; \
+ ;; \
+ mov ar.rnat = temp1; \
+ ;; \
+ mov temp1 = old_psr; \
+ ;; \
+ mov temp2 = 1; \
+ ;; \
+ dep temp1 = temp2, temp1, PSR_IC, 1; \
+ ;; \
+ dep temp1 = temp2, temp1, PSR_IT, 1; \
+ ;; \
+ dep temp1 = temp2, temp1, PSR_DT, 1; \
+ ;; \
+ dep temp1 = temp2, temp1, PSR_RT, 1; \
+ ;; \
+ dep temp1 = temp2, temp1, PSR_BN, 1; \
+ ;; \
+ \
+ mov cr.ipsr = temp1; \
+ movl temp2 = start_addr; \
+ ;; \
+ mov cr.iip = temp2; \
+ movl gp = __gp \
+ ;; \
+ DATA_PA_TO_VA(sp, temp1); \
+ srlz.i; \
+ ;; \
+ nop 1; \
+ nop 2; \
+ nop 1; \
+ rfi \
+ ;;
+
+/*
+ * The MCA and INIT stacks in struct ia64_mca_cpu look like normal kernel
+ * stacks, except that the SAL/OS state and a switch_stack are stored near the
+ * top of the MCA/INIT stack. To support concurrent entry to MCA or INIT, as
+ * well as MCA over INIT, each event needs its own SAL/OS state. All entries
+ * are 16 byte aligned.
+ *
+ * +---------------------------+
+ * | pt_regs |
+ * +---------------------------+
+ * | switch_stack |
+ * +---------------------------+
+ * | SAL/OS state |
+ * +---------------------------+
+ * | 16 byte scratch area |
+ * +---------------------------+ <-------- SP at start of C MCA handler
+ * | ..... |
+ * +---------------------------+
+ * | RBS for MCA/INIT handler |
+ * +---------------------------+
+ * | struct task for MCA/INIT |
+ * +---------------------------+ <-------- Bottom of MCA/INIT stack
+ */
+
+#define ALIGN16(x) ((x)&~15)
+#define MCA_PT_REGS_OFFSET ALIGN16(KERNEL_STACK_SIZE-IA64_PT_REGS_SIZE)
+#define MCA_SWITCH_STACK_OFFSET ALIGN16(MCA_PT_REGS_OFFSET-IA64_SWITCH_STACK_SIZE)
+#define MCA_SOS_OFFSET ALIGN16(MCA_SWITCH_STACK_OFFSET-IA64_SAL_OS_STATE_SIZE)
+#define MCA_SP_OFFSET ALIGN16(MCA_SOS_OFFSET-16)
+
+#endif /* _ASM_IA64_MCA_ASM_H */
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