^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0-only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * ESI call stub.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2005 Hewlett-Packard Co
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Alex Williamson <alex.williamson@hp.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Based on EFI call stub by David Mosberger. The stub is virtually
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * identical to the one for EFI phys-mode calls, except that ESI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * calls may have up to 8 arguments, so they get passed to this routine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * through memory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * This stub allows us to make ESI calls in physical mode with interrupts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * turned off. ESI calls may not support calling from virtual mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Google for "Extensible SAL specification" for a document describing the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * ESI standard.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * PSR settings as per SAL spec (Chapter 8 in the "IA-64 System
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Abstraction Layer Specification", revision 2.6e). Note that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * psr.dfl and psr.dfh MUST be cleared, despite what this manual says.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * Otherwise, SAL dies whenever it's trying to do an IA-32 BIOS call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * (the br.ia instruction fails unless psr.dfl and psr.dfh are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * cleared). Fortunately, SAL promises not to touch the floating
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * point regs, so at least we don't have to save f2-f127.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define PSR_BITS_TO_CLEAR \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) (IA64_PSR_I | IA64_PSR_IT | IA64_PSR_DT | IA64_PSR_RT | \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) IA64_PSR_DD | IA64_PSR_SS | IA64_PSR_RI | IA64_PSR_ED | \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) IA64_PSR_DFL | IA64_PSR_DFH)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define PSR_BITS_TO_SET \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) (IA64_PSR_BN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <asm/asmmacro.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <asm/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * Inputs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * in0 = address of function descriptor of ESI routine to call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * in1 = address of array of ESI parameters
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * Outputs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * r8 = result returned by called function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) GLOBAL_ENTRY(esi_call_phys)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) .prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) alloc loc1=ar.pfs,2,7,8,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) ld8 r2=[in0],8 // load ESI function's entry point
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) mov loc0=rp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) .body
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) ;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) ld8 out0=[in1],8 // ESI params loaded from array
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) ;; // passing all as inputs doesn't work
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) ld8 out1=[in1],8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) ;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) ld8 out2=[in1],8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) ld8 out3=[in1],8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) ;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) ld8 out4=[in1],8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) ;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) ld8 out5=[in1],8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) ;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) ld8 out6=[in1],8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) ;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) ld8 out7=[in1]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) mov loc2=gp // save global pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) mov loc4=ar.rsc // save RSE configuration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) mov ar.rsc=0 // put RSE in enforced lazy, LE mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) ;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) ld8 gp=[in0] // load ESI function's global pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) movl r16=PSR_BITS_TO_CLEAR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) mov loc3=psr // save processor status word
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) movl r17=PSR_BITS_TO_SET
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) ;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) or loc3=loc3,r17
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) mov b6=r2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) ;;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) andcm r16=loc3,r16 // get psr with IT, DT, and RT bits cleared
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) br.call.sptk.many rp=ia64_switch_mode_phys
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) .ret0: mov loc5=r19 // old ar.bsp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) mov loc6=r20 // old sp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) br.call.sptk.many rp=b6 // call the ESI function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) .ret1: mov ar.rsc=0 // put RSE in enforced lazy, LE mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) mov r16=loc3 // save virtual mode psr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) mov r19=loc5 // save virtual mode bspstore
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) mov r20=loc6 // save virtual mode sp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) br.call.sptk.many rp=ia64_switch_mode_virt // return to virtual mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) .ret2: mov ar.rsc=loc4 // restore RSE configuration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) mov ar.pfs=loc1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) mov rp=loc0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) mov gp=loc2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) br.ret.sptk.many rp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) END(esi_call_phys)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) EXPORT_SYMBOL_GPL(esi_call_phys)
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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