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//========================================================================
// GLFW - An OpenGL framework
// File: dos_irq.s
// Platform: DOS
// API version: 2.4
// WWW: http://glfw.sourceforge.net
//------------------------------------------------------------------------
// Copyright (c) 2002-2004 Camilla Berglund
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
.file "dos_irq.S"
.text
#define IRQ_STACK_SIZE 16384
#define IRQ_WRAPPER_LEN (__irq_wrapper_1-__irq_wrapper_0)
#define IRQ_OLD (__irq_old_0-__irq_wrapper_0)
#define IRQ_HOOK (__irq_hook_0-__irq_wrapper_0)
#define IRQ_STACK (__irq_stack_0-__irq_wrapper_0)
//========================================================================
// common
//========================================================================
.balign 4
common:
movw $0x0400, %ax
int $0x31
movl %ss:8(%ebp), %ebx
cmpl $15, %ebx
jbe 0f
fail:
orl $-1, %eax
popl %edi
popl %ebx
leave
ret
0:
movl %ebx, %edi
imull $IRQ_WRAPPER_LEN, %edi
addl $__irq_wrapper_0, %edi
cmpb $7, %bl
jbe 1f
movb %dl, %dh
subb $8, %dh
1:
addb %dh, %bl
ret
//========================================================================
// _glfwInstallDOSIrq()
//========================================================================
.balign 4
.global __glfwInstallDOSIrq
__glfwInstallDOSIrq:
pushl %ebp
movl %esp, %ebp
pushl %ebx
pushl %edi
call common
cmpl $0, IRQ_HOOK(%edi)
jne fail
pushl $IRQ_WRAPPER_LEN
pushl %edi
call __go32_dpmi_lock_code
addl $8, %esp
testl %eax, %eax
jnz fail
/* OLD >>
pushl $IRQ_STACK_SIZE
call _pc_malloc
popl %edx
testl %eax, %eax
jz fail
addl %edx, %eax
movl %eax, IRQ_STACK(%edi)
<< OLD */
/* MG: NEW >> */
pushl $IRQ_STACK_SIZE
call _malloc
popl %edx
testl %eax, %eax
jz fail
pushl %edx
pushl %eax
call __go32_dpmi_lock_data
addl $8, %esp
testl %eax, %eax
jnz fail
subl $8, %esp
popl %eax
popl %edx
addl %edx, %eax
movl %eax, IRQ_STACK(%edi)
/* << NEW */
movl ___djgpp_ds_alias, %eax
movl %eax, IRQ_STACK+4(%edi)
movl %ss:12(%ebp), %eax
movl %eax, IRQ_HOOK(%edi)
movw $0x0204, %ax
int $0x31
movl %edx, IRQ_OLD(%edi)
movw %cx, IRQ_OLD+4(%edi)
movw $0x0205, %ax
movl %edi, %edx
movl %cs, %ecx
int $0x31
done:
xorl %eax, %eax
popl %edi
popl %ebx
leave
ret
//========================================================================
// _glfwRemoveDOSIrq()
//========================================================================
.balign 4
.global __glfwRemoveDOSIrq
__glfwRemoveDOSIrq:
pushl %ebp
movl %esp, %ebp
pushl %ebx
pushl %edi
call common
cmpl $0, IRQ_HOOK(%edi)
je fail
movl $0, IRQ_HOOK(%edi)
movw $0x0205, %ax
movl IRQ_OLD(%edi), %edx
movl IRQ_OLD+4(%edi), %ecx
int $0x31
movl IRQ_STACK(%edi), %eax
subl $IRQ_STACK_SIZE, %eax
pushl %eax
call _free
popl %eax
jmp done
//========================================================================
// IRQ wrapper code for all 16 different IRQs
//========================================================================
#define WRAPPER(x) ; \
.balign 4 ; \
__irq_wrapper_##x: ; \
pushal ; \
pushl %ds ; \
pushl %es ; \
pushl %fs ; \
pushl %gs ; \
movl %ss, %ebx ; \
movl %esp, %esi ; \
lss %cs:__irq_stack_##x, %esp ; \
pushl %ss ; \
pushl %ss ; \
popl %es ; \
popl %ds ; \
movl ___djgpp_dos_sel, %fs ; \
pushl %fs ; \
popl %gs ; \
call *__irq_hook_##x ; \
movl %ebx, %ss ; \
movl %esi, %esp ; \
testl %eax, %eax ; \
popl %gs ; \
popl %fs ; \
popl %es ; \
popl %ds ; \
popal ; \
jz __irq_ignore_##x ; \
__irq_bypass_##x: ; \
ljmp *%cs:__irq_old_##x ; \
__irq_ignore_##x: ; \
iret ; \
.balign 4 ; \
__irq_old_##x: ; \
.long 0, 0 ; \
__irq_hook_##x: ; \
.long 0 ; \
__irq_stack_##x: ; \
.long 0, 0
WRAPPER(0);
WRAPPER(1);
WRAPPER(2);
WRAPPER(3);
WRAPPER(4);
WRAPPER(5);
WRAPPER(6);
WRAPPER(7);
WRAPPER(8);
WRAPPER(9);
WRAPPER(10);
WRAPPER(11);
WRAPPER(12);
WRAPPER(13);
WRAPPER(14);
WRAPPER(15);
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