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59 | jermar | 1 | # |
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 | |||
919 | jermar | 29 | #include <arch/register.h> |
30 | |||
59 | jermar | 31 | .text |
32 | |||
33 | .global memcpy |
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34 | memcpy: |
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205 | jermar | 35 | br _memcpy |
81 | jermar | 36 | |
102 | jermar | 37 | .global memsetb |
38 | memsetb: |
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39 | br _memsetb |
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40 | |||
41 | .global cpu_halt |
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42 | cpu_halt: |
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43 | br cpu_halt |
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44 | |||
45 | .global panic_printf |
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46 | panic_printf: |
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47 | { |
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48 | br.call.sptk.many b0=printf |
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49 | } |
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736 | jermar | 50 | br halt |
919 | jermar | 51 | |
52 | /** Switch to userspace - low level code. |
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53 | * |
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54 | * @param in0 Userspace entry point address. |
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55 | * @param in1 Userspace stack pointer address. |
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56 | * @param in2 Userspace register stack pointer address. |
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1078 | jermar | 57 | * @param in3 Userspace address of thread uspace_arg_t structure. |
58 | * @param in4 Value to be stored in IPSR. |
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59 | * @param in5 Value to be stored in RSC. |
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919 | jermar | 60 | */ |
61 | .global switch_to_userspace |
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62 | switch_to_userspace: |
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1078 | jermar | 63 | alloc loc0 = ar.pfs, 6, 3, 0, 0 |
993 | jermar | 64 | rsm (PSR_IC_MASK | PSR_I_MASK) /* disable interruption collection and interrupts */ |
919 | jermar | 65 | srlz.d ;; |
66 | srlz.i ;; |
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67 | |||
1078 | jermar | 68 | mov cr.ipsr = in4 |
919 | jermar | 69 | mov cr.iip = in0 |
70 | mov r12 = in1 |
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71 | |||
72 | xor r1 = r1, r1 |
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73 | |||
74 | mov loc1 = cr.ifs |
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75 | movl loc2 = PFM_MASK ;; |
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76 | and loc1 = loc2, loc1 ;; |
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77 | mov cr.ifs = loc1 ;; /* prevent decrementing BSP by rfi */ |
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78 | |||
79 | invala |
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80 | |||
81 | mov loc1 = ar.rsc ;; |
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82 | and loc1 = ~3, loc1 ;; |
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83 | mov ar.rsc = loc1 ;; /* put RSE into enforced lazy mode */ |
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84 | |||
85 | flushrs ;; |
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86 | |||
87 | mov ar.bspstore = in2 ;; |
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1078 | jermar | 88 | mov ar.rsc = in5 ;; |
919 | jermar | 89 | |
1078 | jermar | 90 | mov r8 = in3 |
91 | |||
919 | jermar | 92 | rfi ;; |