mca_asm.h
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- /*
- * File: mca_asm.h
- *
- * 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>
- */
- #ifndef _ASM_IA64_MCA_ASM_H
- #define _ASM_IA64_MCA_ASM_H
- #define PSR_IC 13
- #define PSR_I 14
- #define PSR_DT 17
- #define PSR_RT 27
- #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)
- dep addr = 0, addr, 61, 3
- /*
- * 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
- /*
- * 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;
- ;;
- movl temp2 = start_addr;
- mov cr.ipsr = temp1;
- ;;
- INST_VA_TO_PA(temp2);
- ;;
- 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;
- ;;
- DATA_PA_TO_VA(r13,temp1);
- ;;
- 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;
- ;;
- DATA_PA_TO_VA(sp, temp1);
- DATA_PA_TO_VA(gp, temp2);
- srlz.i;
- ;;
- nop 1;
- nop 2;
- nop 1;
- rfi
- ;;
- /*
- * The following offsets capture the order in which the
- * RSE related registers from the old context are
- * saved onto the new stack frame.
- *
- * +-----------------------+
- * |NDIRTY [BSP - BSPSTORE]|
- * +-----------------------+
- * | RNAT |
- * +-----------------------+
- * | BSPSTORE |
- * +-----------------------+
- * | IFS |
- * +-----------------------+
- * | PFS |
- * +-----------------------+
- * | RSC |
- * +-----------------------+ <-------- Bottom of new stack frame
- */
- #define rse_rsc_offset 0
- #define rse_pfs_offset (rse_rsc_offset+0x08)
- #define rse_ifs_offset (rse_pfs_offset+0x08)
- #define rse_bspstore_offset (rse_ifs_offset+0x08)
- #define rse_rnat_offset (rse_bspstore_offset+0x08)
- #define rse_ndirty_offset (rse_rnat_offset+0x08)
- /*
- * rse_switch_context
- *
- * 1. Save old RSC onto the new stack frame
- * 2. Save PFS onto new stack frame
- * 3. Cover the old frame and start a new frame.
- * 4. Save IFS onto new stack frame
- * 5. Save the old BSPSTORE on the new stack frame
- * 6. Save the old RNAT on the new stack frame
- * 7. Write BSPSTORE with the new backing store pointer
- * 8. Read and save the new BSP to calculate the #dirty registers
- * NOTE: Look at pages 11-10, 11-11 in PRM Vol 2
- */
- #define rse_switch_context(temp,p_stackframe,p_bspstore)
- ;;
- mov temp=ar.rsc;;
- st8 [p_stackframe]=temp,8;;
- mov temp=ar.pfs;;
- st8 [p_stackframe]=temp,8;
- cover ;;
- mov temp=cr.ifs;;
- st8 [p_stackframe]=temp,8;;
- mov temp=ar.bspstore;;
- st8 [p_stackframe]=temp,8;;
- mov temp=ar.rnat;;
- st8 [p_stackframe]=temp,8;
- mov ar.bspstore=p_bspstore;;
- mov temp=ar.bsp;;
- sub temp=temp,p_bspstore;;
- st8 [p_stackframe]=temp,8;;
- /*
- * rse_return_context
- * 1. Allocate a zero-sized frame
- * 2. Store the number of dirty registers RSC.loadrs field
- * 3. Issue a loadrs to insure that any registers from the interrupted
- * context which were saved on the new stack frame have been loaded
- * back into the stacked registers
- * 4. Restore BSPSTORE
- * 5. Restore RNAT
- * 6. Restore PFS
- * 7. Restore IFS
- * 8. Restore RSC
- * 9. Issue an RFI
- */
- #define rse_return_context(psr_mask_reg,temp,p_stackframe)
- ;;
- alloc temp=ar.pfs,0,0,0,0;
- add p_stackframe=rse_ndirty_offset,p_stackframe;;
- ld8 temp=[p_stackframe];;
- shl temp=temp,16;;
- mov ar.rsc=temp;;
- loadrs;;
- add p_stackframe=-rse_ndirty_offset+rse_bspstore_offset,p_stackframe;;
- ld8 temp=[p_stackframe];;
- mov ar.bspstore=temp;;
- add p_stackframe=-rse_bspstore_offset+rse_rnat_offset,p_stackframe;;
- ld8 temp=[p_stackframe];;
- mov ar.rnat=temp;;
- add p_stackframe=-rse_rnat_offset+rse_pfs_offset,p_stackframe;;
- ld8 temp=[p_stackframe];;
- mov ar.pfs=temp;;
- add p_stackframe=-rse_pfs_offset+rse_ifs_offset,p_stackframe;;
- ld8 temp=[p_stackframe];;
- mov cr.ifs=temp;;
- add p_stackframe=-rse_ifs_offset+rse_rsc_offset,p_stackframe;;
- ld8 temp=[p_stackframe];;
- mov ar.rsc=temp ;
- mov temp=psr;;
- or temp=temp,psr_mask_reg;;
- mov cr.ipsr=temp;;
- mov temp=ip;;
- add temp=0x30,temp;;
- mov cr.iip=temp;;
- srlz.i;;
- rfi;;
- #endif /* _ASM_IA64_MCA_ASM_H */