pal.S
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上传日期:2013-04-10
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文件大小:6k
- /*
- * PAL Firmware support
- * IA-64 Processor Programmers Reference Vol 2
- *
- * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
- * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
- * Copyright (C) 1999-2001 Hewlett-Packard Co
- * David Mosberger <davidm@hpl.hp.com>
- * Stephane Eranian <eranian@hpl.hp.com>
- *
- * 05/22/2000 eranian Added support for stacked register calls
- * 05/24/2000 eranian Added support for physical mode static calls
- */
- #include <asm/asmmacro.h>
- #include <asm/processor.h>
- .data
- pal_entry_point:
- data8 ia64_pal_default_handler
- .text
- /*
- * Set the PAL entry point address. This could be written in C code, but we do it here
- * to keep it all in one module (besides, it's so trivial that it's
- * not a big deal).
- *
- * in0 Address of the PAL entry point (text address, NOT a function descriptor).
- */
- GLOBAL_ENTRY(ia64_pal_handler_init)
- alloc r3=ar.pfs,1,0,0,0
- movl r2=pal_entry_point
- ;;
- st8 [r2]=in0
- br.ret.sptk.many rp
- END(ia64_pal_handler_init)
- /*
- * Default PAL call handler. This needs to be coded in assembly because it uses
- * the static calling convention, i.e., the RSE may not be used and calls are
- * done via "br.cond" (not "br.call").
- */
- GLOBAL_ENTRY(ia64_pal_default_handler)
- mov r8=-1
- br.cond.sptk.many rp
- END(ia64_pal_default_handler)
- /*
- * Make a PAL call using the static calling convention.
- *
- * in0 Index of PAL service
- * in1 - in3 Remaining PAL arguments
- * in4 1 ==> clear psr.ic, 0 ==> don't clear psr.ic
- *
- */
- GLOBAL_ENTRY(ia64_pal_call_static)
- .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(6)
- alloc loc1 = ar.pfs,6,90,0,0
- movl loc2 = pal_entry_point
- 1: {
- mov r28 = in0
- mov r29 = in1
- mov r8 = ip
- }
- ;;
- ld8 loc2 = [loc2] // loc2 <- entry point
- tbit.nz p6,p7 = in4, 0
- adds r8 = 1f-1b,r8
- ;;
- mov loc3 = psr
- mov loc0 = rp
- .body
- mov r30 = in2
- (p6) rsm psr.i | psr.ic
- mov r31 = in3
- mov b7 = loc2
- (p7) rsm psr.i
- ;;
- (p6) srlz.i
- mov rp = r8
- br.cond.sptk.many b7
- 1: mov psr.l = loc3
- mov ar.pfs = loc1
- mov rp = loc0
- ;;
- srlz.d // seralize restoration of psr.l
- br.ret.sptk.many b0
- END(ia64_pal_call_static)
- /*
- * Make a PAL call using the stacked registers calling convention.
- *
- * Inputs:
- * in0 Index of PAL service
- * in2 - in3 Remaning PAL arguments
- */
- GLOBAL_ENTRY(ia64_pal_call_stacked)
- .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(5)
- alloc loc1 = ar.pfs,5,4,87,0
- movl loc2 = pal_entry_point
- mov r28 = in0 // Index MUST be copied to r28
- mov out0 = in0 // AND in0 of PAL function
- mov loc0 = rp
- .body
- ;;
- ld8 loc2 = [loc2] // loc2 <- entry point
- mov out1 = in1
- mov out2 = in2
- mov out3 = in3
- mov loc3 = psr
- ;;
- rsm psr.i
- mov b7 = loc2
- ;;
- br.call.sptk.many rp=b7 // now make the call
- .ret0: mov psr.l = loc3
- mov ar.pfs = loc1
- mov rp = loc0
- ;;
- srlz.d // serialize restoration of psr.l
- br.ret.sptk.many b0
- END(ia64_pal_call_stacked)
- /*
- * Make a physical mode PAL call using the static registers calling convention.
- *
- * Inputs:
- * in0 Index of PAL service
- * in2 - in3 Remaning PAL arguments
- *
- * PSR_DB, PSR_LP, PSR_TB, PSR_ID, PSR_DA are never set by the kernel.
- * So we don't need to clear them.
- */
- #define PAL_PSR_BITS_TO_CLEAR
- (IA64_PSR_I | IA64_PSR_IT | IA64_PSR_DT | IA64_PSR_RT |
- IA64_PSR_DD | IA64_PSR_SS | IA64_PSR_RI | IA64_PSR_ED |
- IA64_PSR_DFL | IA64_PSR_DFH)
- #define PAL_PSR_BITS_TO_SET
- (IA64_PSR_BN)
- GLOBAL_ENTRY(ia64_pal_call_phys_static)
- .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(6)
- alloc loc1 = ar.pfs,6,90,0,0
- movl loc2 = pal_entry_point
- 1: {
- mov r28 = in0 // copy procedure index
- mov r8 = ip // save ip to compute branch
- mov loc0 = rp // save rp
- }
- .body
- ;;
- ld8 loc2 = [loc2] // loc2 <- entry point
- mov r29 = in1 // first argument
- mov r30 = in2 // copy arg2
- mov r31 = in3 // copy arg3
- ;;
- mov loc3 = psr // save psr
- adds r8 = 1f-1b,r8 // calculate return address for call
- ;;
- mov loc4=ar.rsc // save RSE configuration
- dep.z loc2=loc2,0,61 // convert pal entry point to physical
- dep.z r8=r8,0,61 // convert rp to physical
- ;;
- mov b7 = loc2 // install target to branch reg
- mov ar.rsc=0 // put RSE in enforced lazy, LE mode
- movl r16=PAL_PSR_BITS_TO_CLEAR
- movl r17=PAL_PSR_BITS_TO_SET
- ;;
- or loc3=loc3,r17 // add in psr the bits to set
- ;;
- andcm r16=loc3,r16 // removes bits to clear from psr
- br.call.sptk.many rp=ia64_switch_mode
- .ret1: mov rp = r8 // install return address (physical)
- br.cond.sptk.many b7
- 1:
- mov ar.rsc=0 // put RSE in enforced lazy, LE mode
- mov r16=loc3 // r16= original psr
- br.call.sptk.many rp=ia64_switch_mode // return to virtual mode
- .ret2:
- mov psr.l = loc3 // restore init PSR
- mov ar.pfs = loc1
- mov rp = loc0
- ;;
- mov ar.rsc=loc4 // restore RSE configuration
- srlz.d // seralize restoration of psr.l
- br.ret.sptk.many b0
- END(ia64_pal_call_phys_static)
- /*
- * Make a PAL call using the stacked registers in physical mode.
- *
- * Inputs:
- * in0 Index of PAL service
- * in2 - in3 Remaning PAL arguments
- */
- GLOBAL_ENTRY(ia64_pal_call_phys_stacked)
- .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(5)
- alloc loc1 = ar.pfs,5,5,86,0
- movl loc2 = pal_entry_point
- 1: {
- mov r28 = in0 // copy procedure index
- mov loc0 = rp // save rp
- }
- .body
- ;;
- ld8 loc2 = [loc2] // loc2 <- entry point
- mov out0 = in0 // first argument
- mov out1 = in1 // copy arg2
- mov out2 = in2 // copy arg3
- mov out3 = in3 // copy arg3
- ;;
- mov loc3 = psr // save psr
- ;;
- mov loc4=ar.rsc // save RSE configuration
- dep.z loc2=loc2,0,61 // convert pal entry point to physical
- ;;
- mov ar.rsc=0 // put RSE in enforced lazy, LE mode
- movl r16=PAL_PSR_BITS_TO_CLEAR
- movl r17=PAL_PSR_BITS_TO_SET
- ;;
- or loc3=loc3,r17 // add in psr the bits to set
- mov b7 = loc2 // install target to branch reg
- ;;
- andcm r16=loc3,r16 // removes bits to clear from psr
- br.call.sptk.many rp=ia64_switch_mode
- .ret6:
- br.call.sptk.many rp=b7 // now make the call
- .ret7:
- mov ar.rsc=0 // put RSE in enforced lazy, LE mode
- mov r16=loc3 // r16= original psr
- br.call.sptk.many rp=ia64_switch_mode // return to virtual mode
- .ret8: mov psr.l = loc3 // restore init PSR
- mov ar.pfs = loc1
- mov rp = loc0
- ;;
- mov ar.rsc=loc4 // restore RSE configuration
- srlz.d // seralize restoration of psr.l
- br.ret.sptk.many b0
- END(ia64_pal_call_phys_stacked)