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Diffstat (limited to 'arch/ia64/kernel/esi_stub.S')
| -rw-r--r-- | arch/ia64/kernel/esi_stub.S | 99 |
1 files changed, 0 insertions, 99 deletions
diff --git a/arch/ia64/kernel/esi_stub.S b/arch/ia64/kernel/esi_stub.S deleted file mode 100644 index 9928c5b295..0000000000 --- a/arch/ia64/kernel/esi_stub.S +++ /dev/null @@ -1,99 +0,0 @@ -/* 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) |