2007-09-25 02:59:42 +00:00
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2007 by Michael Sevakis
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*
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* ARM code for memory framebuffer LCDs
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*
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2008-06-28 18:10:04 +00:00
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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2007-09-25 02:59:42 +00:00
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "cpu.h"
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/****************************************************************************
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* void lcd_copy_buffer_rect(fb_data *dst, fb_data *src, int width,
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* int height);
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*/
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2011-12-17 01:43:32 +00:00
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.section .icode.lcd_copy_buffer_rect, "ax", %progbits
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2007-09-25 02:59:42 +00:00
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.align 2
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.global lcd_copy_buffer_rect
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.type lcd_copy_buffer_rect, %function
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@ r0 = dst
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@ r1 = src
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@ r2 = width
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@ r3 = height
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lcd_copy_buffer_rect: @
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2009-07-11 23:43:44 +00:00
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stmfd sp!, { r4-r11, lr } @ save non-scratch regs
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2007-09-25 02:59:42 +00:00
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mov r5, r2 @ r5 = cached width
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rsb r4, r2, #LCD_WIDTH @ r4 = LCD_WIDTH - width
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10: @ copy line @
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subs r2, r5, #1 @ r2 = width - 1
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beq 40f @ finish line @ one halfword? skip to trailing copy
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tst r0, #2 @ word aligned?
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beq 20f @ rem copy @ yes? skip to word copy
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ldrh r6, [r1], #2 @ copy leading halfword
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subs r2, r2, #1 @
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strh r6, [r0], #2 @
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ble 40f @ finish line @ next line if lt or finish
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@ trailing halfword if eq
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20: @ rem copy @
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2012-01-14 21:16:05 +00:00
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sub r14, r2, #1 @ wrap remaining width mod 16 after word
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2007-09-25 02:59:42 +00:00
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@ align (rw)
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2012-01-14 21:16:05 +00:00
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and r14, r14, #0xe @ r14 = 14, 0, 2, 4, 6, 8, 10, 12
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2007-09-25 02:59:42 +00:00
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add pc, pc, r14, lsl #3 @ branch to 32-byte align
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2011-12-17 01:43:32 +00:00
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nop @
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2012-01-14 21:16:05 +00:00
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ldr r6, [r1], #4 @ rw % 16 = 2 or 3 (0)
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2007-09-25 02:59:42 +00:00
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subs r2, r2, #2 @
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str r6, [r0], #4 @
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b 25f @ copy up done @
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2012-01-14 21:16:05 +00:00
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ldmia r1!, { r6-r7 } @ rw % 16 = 4 or 5 (2)
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2007-09-25 02:59:42 +00:00
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subs r2, r2, #4 @
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stmia r0!, { r6-r7 } @
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b 25f @ copy up done @
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2012-01-14 21:16:05 +00:00
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ldmia r1!, { r6-r8 } @ rw % 16 = 6 or 7 (4)
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2007-09-25 02:59:42 +00:00
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subs r2, r2, #6 @
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stmia r0!, { r6-r8 } @
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b 25f @ copy up done @
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2012-01-14 21:16:05 +00:00
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ldmia r1!, { r6-r9 } @ rw % 16 = 8 or 9 (6)
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2007-09-25 02:59:42 +00:00
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subs r2, r2, #8 @
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stmia r0!, { r6-r9 } @
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b 25f @ copy up done @
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2012-01-14 21:16:05 +00:00
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ldmia r1!, { r6-r10 } @ rw % 16 = 10 or 11 (8)
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2007-09-25 02:59:42 +00:00
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subs r2, r2, #10 @
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stmia r0!, { r6-r10 } @
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b 25f @ copy up done @
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2012-01-14 21:16:05 +00:00
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ldmia r1!, { r6-r11 } @ rw % 16 = 12 or 13 (10)
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2007-09-25 02:59:42 +00:00
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subs r2, r2, #12 @
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stmia r0!, { r6-r11 } @
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b 25f @ copy up done @
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2012-01-14 21:16:05 +00:00
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ldmia r1!, { r6-r12 } @ rw % 16 = 14 or 15 (12)
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2007-09-25 02:59:42 +00:00
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subs r2, r2, #14 @
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stmia r0!, { r6-r12 } @
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25: @ copy up done @
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2012-01-14 21:16:05 +00:00
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ble 40f @ finish line @
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30: @ octword loop @ rw % 16 = 0 or 1 (14)
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ldmia r1!, { r6-r12, r14 } @ copy 16 pixels per loop
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2007-09-25 02:59:42 +00:00
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subs r2, r2, #16 @
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stmia r0!, { r6-r12, r14 } @
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2011-12-17 01:43:32 +00:00
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bgt 30b @ octword loop @
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2007-09-25 02:59:42 +00:00
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40: @ finish line @
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ldreqh r6, [r1], #2 @ finish last halfword if eq ...
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add r1, r1, r4, lsl #1 @
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streqh r6, [r0], #2 @ ...
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add r0, r0, r4, lsl #1 @
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subs r3, r3, #1 @ next line
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bgt 10b @ copy line @
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2010-06-11 04:41:36 +00:00
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ldmpc regs=r4-r11 @ restore regs and return
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2007-09-25 02:59:42 +00:00
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.size lcd_copy_buffer_rect, .-lcd_copy_buffer_rect
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