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-rw-r--r--arch/ia64/kernel/esi_stub.S99
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diff --git a/arch/ia64/kernel/esi_stub.S b/arch/ia64/kernel/esi_stub.S
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--- a/arch/ia64/kernel/esi_stub.S
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-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * ESI call stub.
- *
- * Copyright (C) 2005 Hewlett-Packard Co
- * Alex Williamson <alex.williamson@hp.com>
- *
- * Based on EFI call stub by David Mosberger. The stub is virtually
- * identical to the one for EFI phys-mode calls, except that ESI
- * calls may have up to 8 arguments, so they get passed to this routine
- * through memory.
- *
- * This stub allows us to make ESI calls in physical mode with interrupts
- * turned off. ESI calls may not support calling from virtual mode.
- *
- * Google for "Extensible SAL specification" for a document describing the
- * ESI standard.
- */
-
-/*
- * PSR settings as per SAL spec (Chapter 8 in the "IA-64 System
- * Abstraction Layer Specification", revision 2.6e). Note that
- * psr.dfl and psr.dfh MUST be cleared, despite what this manual says.
- * Otherwise, SAL dies whenever it's trying to do an IA-32 BIOS call
- * (the br.ia instruction fails unless psr.dfl and psr.dfh are
- * cleared). Fortunately, SAL promises not to touch the floating
- * point regs, so at least we don't have to save f2-f127.
- */
-#define 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 PSR_BITS_TO_SET \
- (IA64_PSR_BN)
-
-#include <linux/export.h>
-#include <asm/processor.h>
-#include <asm/asmmacro.h>
-
-/*
- * Inputs:
- * in0 = address of function descriptor of ESI routine to call
- * in1 = address of array of ESI parameters
- *
- * Outputs:
- * r8 = result returned by called function
- */
-GLOBAL_ENTRY(esi_call_phys)
- .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
- alloc loc1=ar.pfs,2,7,8,0
- ld8 r2=[in0],8 // load ESI function's entry point
- mov loc0=rp
- .body
- ;;
- ld8 out0=[in1],8 // ESI params loaded from array
- ;; // passing all as inputs doesn't work
- ld8 out1=[in1],8
- ;;
- ld8 out2=[in1],8
- ;;
- ld8 out3=[in1],8
- ;;
- ld8 out4=[in1],8
- ;;
- ld8 out5=[in1],8
- ;;
- ld8 out6=[in1],8
- ;;
- ld8 out7=[in1]
- mov loc2=gp // save global pointer
- mov loc4=ar.rsc // save RSE configuration
- mov ar.rsc=0 // put RSE in enforced lazy, LE mode
- ;;
- ld8 gp=[in0] // load ESI function's global pointer
- movl r16=PSR_BITS_TO_CLEAR
- mov loc3=psr // save processor status word
- movl r17=PSR_BITS_TO_SET
- ;;
- or loc3=loc3,r17
- mov b6=r2
- ;;
- andcm r16=loc3,r16 // get psr with IT, DT, and RT bits cleared
- br.call.sptk.many rp=ia64_switch_mode_phys
-.ret0: mov loc5=r19 // old ar.bsp
- mov loc6=r20 // old sp
- br.call.sptk.many rp=b6 // call the ESI function
-.ret1: mov ar.rsc=0 // put RSE in enforced lazy, LE mode
- mov r16=loc3 // save virtual mode psr
- mov r19=loc5 // save virtual mode bspstore
- mov r20=loc6 // save virtual mode sp
- br.call.sptk.many rp=ia64_switch_mode_virt // return to virtual mode
-.ret2: mov ar.rsc=loc4 // restore RSE configuration
- mov ar.pfs=loc1
- mov rp=loc0
- mov gp=loc2
- br.ret.sptk.many rp
-END(esi_call_phys)
-EXPORT_SYMBOL_GPL(esi_call_phys)