| [3eddaff] | 1 | #
|
|---|
| [df4ed85] | 2 | # Copyright (c) 2005 Martin Decky
|
|---|
| [3eddaff] | 3 | # All rights reserved.
|
|---|
| 4 | #
|
|---|
| 5 | # Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | # modification, are permitted provided that the following conditions
|
|---|
| 7 | # are met:
|
|---|
| 8 | #
|
|---|
| 9 | # - Redistributions of source code must retain the above copyright
|
|---|
| 10 | # notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | # - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | # notice, this list of conditions and the following disclaimer in the
|
|---|
| 13 | # documentation and/or other materials provided with the distribution.
|
|---|
| 14 | # - The name of the author may not be used to endorse or promote products
|
|---|
| 15 | # derived from this software without specific prior written permission.
|
|---|
| 16 | #
|
|---|
| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | #
|
|---|
| 28 |
|
|---|
| [3cc110f] | 29 | INTEL_CPUID_STANDARD = 1
|
|---|
| 30 | INTEL_SEP = 11
|
|---|
| 31 |
|
|---|
| [a3aa1e1] | 32 | .section .init, "ax"
|
|---|
| [3eddaff] | 33 |
|
|---|
| 34 | .org 0
|
|---|
| 35 |
|
|---|
| 36 | .globl __entry
|
|---|
| 37 |
|
|---|
| 38 | ## User-space task entry point
|
|---|
| 39 | #
|
|---|
| [3cc110f] | 40 | # %edi contains the PCB pointer
|
|---|
| [3eddaff] | 41 | #
|
|---|
| 42 | __entry:
|
|---|
| [ef0aa999] | 43 | mov %ss, %ax
|
|---|
| 44 | mov %ax, %ds
|
|---|
| 45 | mov %ax, %es
|
|---|
| 46 | mov %ax, %fs
|
|---|
| [29a9f62] | 47 | # Do not set %gs, it contains descriptor that can see TLS
|
|---|
| [8c15255] | 48 |
|
|---|
| 49 | #ifndef PROCESSOR_i486
|
|---|
| [3cc110f] | 50 | # Detect the mechanism used for making syscalls
|
|---|
| 51 | movl $(INTEL_CPUID_STANDARD), %eax
|
|---|
| 52 | cpuid
|
|---|
| 53 | bt $(INTEL_SEP), %edx
|
|---|
| 54 | jnc 0f
|
|---|
| 55 | leal __syscall_fast_func, %eax
|
|---|
| 56 | movl $__syscall_fast, (%eax)
|
|---|
| 57 | 0:
|
|---|
| [8c15255] | 58 | #endif
|
|---|
| [b9b105e1] | 59 | #
|
|---|
| [47246f4] | 60 | # Create the first stack frame.
|
|---|
| [b9b105e1] | 61 | #
|
|---|
| [47b7006] | 62 | pushl $0
|
|---|
| [47246f4] | 63 | movl %esp, %ebp
|
|---|
| [47b7006] | 64 |
|
|---|
| [c98e6ee] | 65 | # Pass the PCB pointer to __main as the first argument
|
|---|
| [3cc110f] | 66 | pushl %edi
|
|---|
| [25f9823] | 67 | call __main
|
|---|
