| /* |
| * Copyright (C) 2008 Daniel Verkamp <daniel@drv.nu>. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of the |
| * License, or any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| FILE_LICENCE ( GPL2_OR_LATER ) |
| |
| .text |
| .arch i386 |
| .code32 |
| |
| .globl com32_farcall_wrapper |
| com32_farcall_wrapper: |
| |
| movl $com32_farcall, %eax |
| jmp com32_wrapper |
| |
| |
| .globl com32_cfarcall_wrapper |
| com32_cfarcall_wrapper: |
| |
| movl $com32_cfarcall, %eax |
| jmp com32_wrapper |
| |
| |
| .globl com32_intcall_wrapper |
| com32_intcall_wrapper: |
| |
| movl $com32_intcall, %eax |
| /*jmp com32_wrapper*/ /* fall through */ |
| |
| com32_wrapper: |
| |
| /* Switch to internal virtual address space */ |
| call _phys_to_virt |
| |
| mov %eax, (com32_helper_function) |
| |
| /* Save external COM32 stack pointer */ |
| movl %esp, (com32_external_esp) |
| |
| /* Copy arguments to caller-save registers */ |
| movl 12(%esp), %eax |
| movl 8(%esp), %ecx |
| movl 4(%esp), %edx |
| |
| /* Switch to internal stack */ |
| movl (com32_internal_esp), %esp |
| |
| /* Copy arguments to internal stack */ |
| pushl %eax |
| pushl %ecx |
| pushl %edx |
| |
| call *(com32_helper_function) |
| |
| /* Clean up stack */ |
| addl $12, %esp |
| |
| /* Save internal stack pointer and restore external stack pointer */ |
| movl %esp, (com32_internal_esp) |
| movl (com32_external_esp), %esp |
| |
| /* Switch to external flat physical address space */ |
| call _virt_to_phys |
| |
| ret |
| |
| |
| .data |
| |
| /* Internal gPXE virtual address space %esp */ |
| .globl com32_internal_esp |
| .lcomm com32_internal_esp, 4 |
| |
| /* External flat physical address space %esp */ |
| .globl com32_external_esp |
| .lcomm com32_external_esp, 4 |
| |
| /* Function pointer of helper to call */ |
| .lcomm com32_helper_function, 4 |
