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annotate packages/hal/i386/linux/current/src/linux.S @ 64:c38311975d4f ecos-sw-2000-01-28

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Merge from eCos master repository on 2000-01-28-04:28:11-GMT
author jlarmour
date Fri, 28 Jan 2000 04:59:39 +0000
parents 443894e2e912
children bf00f99aec69
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1 ##=============================================================================
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2 ##
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3 ## linux.S
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4 ##
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5 ## Linux setup
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6 ##
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7 ##=============================================================================
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8 #####COPYRIGHTBEGIN####
64
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9 #
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10 # -------------------------------------------
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11 # The contents of this file are subject to the Red Hat eCos Public License
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12 # Version 1.0 (the "License"); you may not use this file except in
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13 # compliance with the License. You may obtain a copy of the License at
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14 # http://sourceware.cygnus.com/ecos
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15 #
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16 # Software distributed under the License is distributed on an
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17 # basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 # License for the specific language governing rights and limitations under
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19 # the License.
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20 #
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21 # The Original Code is eCos - Embedded Configurable Operating System,
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22 # released September 30, 1998.
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23 #
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24 # The Initial Developer of the Original Code is Red Hat.
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25 # Portions created by Red Hat are
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26 # Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 # All Rights Reserved.
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28 # -------------------------------------------
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29 #
2
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30 #####COPYRIGHTEND####
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31 ##=============================================================================
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32 #######DESCRIPTIONBEGIN####
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33 ##
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34 ## Author(s): jskov
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35 ## Contributors:jskov
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36 ## Date: 1999-03-11
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37 ## Purpose: Linux setup
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38 ## Description: This file contains any code needed to initialize the
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39 ## CPU on an i386/Linux synthetic target.
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40 ##
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41 ######DESCRIPTIONEND####
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42 ##
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43 ##=============================================================================
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44
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45 .globl cyg_hal_hardware_init
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46 cyg_hal_hardware_init:
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47 push %ebp
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48 mov %esp,%ebp
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49 sub $0x4,%esp
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50
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51 ## FIXME: The below turns out to have no effect. At some point
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52 ## before the cause_fpe test of signal2.c gets executes, the
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53 ## flags have been reverted. Don't know what's causing it. Are
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54 ## magic Linux calls required perhaps?
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55 ## Maybe it is because a segv happens before the FPE..
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56
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57 ## Enable floating point exceptions. Bit mask:
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58 ## 1 - invalid operation
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59 ## 2 - denormalized operand
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60 ## 4 - zero divide
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61 ## 8 - overflow
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62 ## 16 - underflow
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63 ## 32 - precision
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64 fstcw -4(%ebp)
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65 movl -4(%ebp),%eax
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66 andb $(~0x04),%al
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67 movl %eax,-4(%ebp)
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68 fldcw -4(%ebp)
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69
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70 mov %ebp,%esp
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71 pop %ebp
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72 ret
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73
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74 #------------------------------------------------------------------------------
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75 # end of linux.S