| 1 | #
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| 2 | # Copyright (C) 2005 Jakub Jermar
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| 3 | # All rights reserved.
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| 4 | #
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| 5 | # Redistribution and use in source and binary forms, with or without
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| 6 | # modification, are permitted provided that the following conditions
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| 7 | # are met:
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| 8 | #
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| 9 | # - Redistributions of source code must retain the above copyright
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| 10 | # notice, this list of conditions and the following disclaimer.
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| 11 | # - Redistributions in binary form must reproduce the above copyright
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| 12 | # notice, this list of conditions and the following disclaimer in the
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| 13 | # documentation and/or other materials provided with the distribution.
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| 14 | # - The name of the author may not be used to endorse or promote products
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| 15 | # derived from this software without specific prior written permission.
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| 16 | #
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | #
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| 28 |
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| 29 | #include <arch/register.h>
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| 30 |
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| 31 | .text
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| 32 |
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| 33 | /** Copy memory from/to userspace.
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| 34 | *
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| 35 | * @param in0 Destination address.
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| 36 | * @param in1 Source address.
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| 37 | * @param in2 Number of byte to copy.
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| 38 | */
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| 39 | .global memcpy
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| 40 | .global memcpy_from_uspace
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| 41 | .global memcpy_to_uspace
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| 42 | .global memcpy_from_uspace_failover_address
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| 43 | .global memcpy_to_uspace_failover_address
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| 44 | memcpy:
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| 45 | memcpy_from_uspace:
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| 46 | memcpy_to_uspace:
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| 47 | br _memcpy
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| 48 |
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| 49 | memcpy_from_uspace_failover_address:
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| 50 | memcpy_to_uspace_failover_address:
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| 51 | br memcpy_from_uspace_failover_address
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| 52 |
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| 53 | .global memsetb
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| 54 | memsetb:
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| 55 | br _memsetb
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| 56 |
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| 57 | .global cpu_halt
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| 58 | cpu_halt:
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| 59 | br cpu_halt
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| 60 |
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| 61 | .global panic_printf
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| 62 | panic_printf:
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| 63 | {
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| 64 | br.call.sptk.many b0=printf
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| 65 | }
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| 66 | br halt
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| 67 |
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| 68 | /** Switch to userspace - low level code.
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| 69 | *
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| 70 | * @param in0 Userspace entry point address.
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| 71 | * @param in1 Userspace stack pointer address.
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| 72 | * @param in2 Userspace register stack pointer address.
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| 73 | * @param in3 Userspace address of thread uspace_arg_t structure.
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| 74 | * @param in4 Value to be stored in IPSR.
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| 75 | * @param in5 Value to be stored in RSC.
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| 76 | */
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| 77 | .global switch_to_userspace
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| 78 | switch_to_userspace:
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| 79 | alloc loc0 = ar.pfs, 6, 3, 0, 0
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| 80 | rsm (PSR_IC_MASK | PSR_I_MASK) /* disable interruption collection and interrupts */
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| 81 | srlz.d ;;
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| 82 | srlz.i ;;
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| 83 |
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| 84 | mov cr.ipsr = in4
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| 85 | mov cr.iip = in0
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| 86 | mov r12 = in1
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| 87 |
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| 88 | xor r1 = r1, r1
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| 89 |
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| 90 | mov loc1 = cr.ifs
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| 91 | movl loc2 = PFM_MASK ;;
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| 92 | and loc1 = loc2, loc1 ;;
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| 93 | mov cr.ifs = loc1 ;; /* prevent decrementing BSP by rfi */
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| 94 |
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| 95 | invala
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| 96 |
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| 97 | mov loc1 = ar.rsc ;;
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| 98 | and loc1 = ~3, loc1 ;;
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| 99 | mov ar.rsc = loc1 ;; /* put RSE into enforced lazy mode */
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| 100 |
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| 101 | flushrs ;;
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| 102 |
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| 103 | mov ar.bspstore = in2 ;;
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| 104 | mov ar.rsc = in5 ;;
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| 105 |
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| 106 | mov r8 = in3
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| 107 |
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| 108 | rfi ;;
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