diff options
Diffstat (limited to 'arch/ia64/kernel/efi_stub.S')
| -rw-r--r-- | arch/ia64/kernel/efi_stub.S | 87 |
1 files changed, 0 insertions, 87 deletions
diff --git a/arch/ia64/kernel/efi_stub.S b/arch/ia64/kernel/efi_stub.S deleted file mode 100644 index 1fd61b78fb29..000000000000 --- a/arch/ia64/kernel/efi_stub.S +++ /dev/null @@ -1,87 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * EFI call stub. - * - * Copyright (C) 1999-2001 Hewlett-Packard Co - * David Mosberger <davidm@hpl.hp.com> - * - * This stub allows us to make EFI calls in physical mode with interrupts - * turned off. We need this because we can't call SetVirtualMap() until - * the kernel has booted far enough to allow allocation of struct vm_area_struct - * entries (which we would need to map stuff with memory attributes other - * than uncached or writeback...). Since the GetTime() service gets called - * earlier than that, we need to be able to make physical mode EFI calls from - * the kernel. - */ - -/* - * 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 <asm/processor.h> -#include <asm/asmmacro.h> - -/* - * Inputs: - * in0 = address of function descriptor of EFI routine to call - * in1..in7 = arguments to routine - * - * Outputs: - * r8 = EFI_STATUS returned by called function - */ - -GLOBAL_ENTRY(efi_call_phys) - .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(8) - alloc loc1=ar.pfs,8,7,7,0 - ld8 r2=[in0],8 // load EFI function's entry point - mov loc0=rp - .body - ;; - 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 EFI 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 out4=in5 - mov out0=in1 - mov out1=in2 - mov out2=in3 - mov out3=in4 - mov out5=in6 - mov out6=in7 - mov loc5=r19 - mov loc6=r20 - br.call.sptk.many rp=b6 // call the EFI function -.ret1: mov ar.rsc=0 // put RSE in enforced lazy, LE mode - mov r16=loc3 - mov r19=loc5 - mov r20=loc6 - 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(efi_call_phys) |