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x86_main.asm
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x86_main.asm
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;
; x86 format converters for HERMES
; Some routines Copyright (c) 1998 Christian Nentwich (brn@eleet.mcb.at)
; This source code is licensed under the GNU LGPL
;
; Please refer to the file COPYING.LIB contained in the distribution for
; licensing conditions
;
; Most routines are (c) Glenn Fiedler (ptc@gaffer.org), used with permission
;
BITS 32
%include "common.asm"
SDL_FUNC _ConvertX86
SDL_FUNC _x86return
SDL_FUNC _Hermes_X86_CPU
SECTION .text
;; _ConvertX86:
;; [ESP+8] ConverterInfo*
;; --------------------------------------------------------------------------
;; ConverterInfo (ebp+..)
;; 0: void *s_pixels
;; 4: int s_width
;; 8: int s_height
;; 12: int s_add
;; 16: void *d_pixels
;; 20: int d_width
;; 24: int d_height
;; 28: int d_add
;; 32: void (*converter_function)()
;; 36: int32 *lookup
_ConvertX86:
push ebp
mov ebp,esp
; Save the registers used by the blitters, necessary for optimized code
pusha
mov eax,[ebp+8]
cmp dword [eax+4],BYTE 0
je endconvert
mov ebp,eax
mov esi,[ebp+0]
mov edi,[ebp+16]
y_loop:
mov ecx,[ebp+4]
jmp [ebp+32]
_x86return:
add esi,[ebp+12]
add edi,[ebp+28]
dec dword [ebp+8]
jnz y_loop
; Restore the registers used by the blitters, necessary for optimized code
popa
pop ebp
endconvert:
ret
;; Hermes_X86_CPU returns the CPUID flags in eax
_Hermes_X86_CPU:
pushfd
pop eax
mov ecx,eax
xor eax,040000h
push eax
popfd
pushfd
pop eax
xor eax,ecx
jz .L1 ; Processor is 386
push ecx
popfd
mov eax,ecx
xor eax,200000h
push eax
popfd
pushfd
pop eax
xor eax,ecx
je .L1
push ebx
mov eax,1
cpuid
mov eax,edx
pop ebx
.L1:
ret
%ifidn __OUTPUT_FORMAT__,elf
section .note.GNU-stack noalloc noexec nowrite progbits
%endif