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99 lines
2.9 KiB
99 lines
2.9 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* ESI call stub. |
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* |
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* Copyright (C) 2005 Hewlett-Packard Co |
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* Alex Williamson <alex.williamson@hp.com> |
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* |
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* Based on EFI call stub by David Mosberger. The stub is virtually |
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* identical to the one for EFI phys-mode calls, except that ESI |
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* calls may have up to 8 arguments, so they get passed to this routine |
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* through memory. |
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* |
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* This stub allows us to make ESI calls in physical mode with interrupts |
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* turned off. ESI calls may not support calling from virtual mode. |
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* |
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* Google for "Extensible SAL specification" for a document describing the |
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* ESI standard. |
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*/ |
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/* |
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* PSR settings as per SAL spec (Chapter 8 in the "IA-64 System |
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* Abstraction Layer Specification", revision 2.6e). Note that |
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* psr.dfl and psr.dfh MUST be cleared, despite what this manual says. |
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* Otherwise, SAL dies whenever it's trying to do an IA-32 BIOS call |
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* (the br.ia instruction fails unless psr.dfl and psr.dfh are |
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* cleared). Fortunately, SAL promises not to touch the floating |
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* point regs, so at least we don't have to save f2-f127. |
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*/ |
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#define PSR_BITS_TO_CLEAR \ |
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(IA64_PSR_I | IA64_PSR_IT | IA64_PSR_DT | IA64_PSR_RT | \ |
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IA64_PSR_DD | IA64_PSR_SS | IA64_PSR_RI | IA64_PSR_ED | \ |
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IA64_PSR_DFL | IA64_PSR_DFH) |
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#define PSR_BITS_TO_SET \ |
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(IA64_PSR_BN) |
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#include <asm/processor.h> |
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#include <asm/asmmacro.h> |
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#include <asm/export.h> |
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/* |
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* Inputs: |
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* in0 = address of function descriptor of ESI routine to call |
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* in1 = address of array of ESI parameters |
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* |
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* Outputs: |
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* r8 = result returned by called function |
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*/ |
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GLOBAL_ENTRY(esi_call_phys) |
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.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2) |
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alloc loc1=ar.pfs,2,7,8,0 |
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ld8 r2=[in0],8 // load ESI function's entry point |
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mov loc0=rp |
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.body |
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;; |
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ld8 out0=[in1],8 // ESI params loaded from array |
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;; // passing all as inputs doesn't work |
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ld8 out1=[in1],8 |
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;; |
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ld8 out2=[in1],8 |
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;; |
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ld8 out3=[in1],8 |
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;; |
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ld8 out4=[in1],8 |
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;; |
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ld8 out5=[in1],8 |
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;; |
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ld8 out6=[in1],8 |
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;; |
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ld8 out7=[in1] |
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mov loc2=gp // save global pointer |
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mov loc4=ar.rsc // save RSE configuration |
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mov ar.rsc=0 // put RSE in enforced lazy, LE mode |
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;; |
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ld8 gp=[in0] // load ESI function's global pointer |
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movl r16=PSR_BITS_TO_CLEAR |
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mov loc3=psr // save processor status word |
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movl r17=PSR_BITS_TO_SET |
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;; |
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or loc3=loc3,r17 |
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mov b6=r2 |
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;; |
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andcm r16=loc3,r16 // get psr with IT, DT, and RT bits cleared |
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br.call.sptk.many rp=ia64_switch_mode_phys |
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.ret0: mov loc5=r19 // old ar.bsp |
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mov loc6=r20 // old sp |
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br.call.sptk.many rp=b6 // call the ESI function |
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.ret1: mov ar.rsc=0 // put RSE in enforced lazy, LE mode |
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mov r16=loc3 // save virtual mode psr |
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mov r19=loc5 // save virtual mode bspstore |
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mov r20=loc6 // save virtual mode sp |
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br.call.sptk.many rp=ia64_switch_mode_virt // return to virtual mode |
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.ret2: mov ar.rsc=loc4 // restore RSE configuration |
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mov ar.pfs=loc1 |
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mov rp=loc0 |
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mov gp=loc2 |
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br.ret.sptk.many rp |
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END(esi_call_phys) |
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EXPORT_SYMBOL_GPL(esi_call_phys)
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