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/* SPDX-License-Identifier: GPL-2.0 */
/*
* File: mca_asm.h
* Purpose: Machine check handling specific defines
*
* Copyright (C) 1999 Silicon Graphics, Inc.
* Copyright (C) Vijay Chander <[email protected]>
* Copyright (C) Srinivasa Thirumalachar <[email protected]>
* Copyright (C) 2000 Hewlett-Packard Co.
* Copyright (C) 2000 David Mosberger-Tang <[email protected]>
* Copyright (C) 2002 Intel Corp.
* Copyright (C) 2002 Jenna Hall <[email protected]>
* Copyright (C) 2005 Silicon Graphics, Inc
* Copyright (C) 2005 Keith Owens <[email protected]>
*/
#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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