402 lines
11 KiB
C
402 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _VIDEO_ATAFB_UTILS_H
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#define _VIDEO_ATAFB_UTILS_H
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/* ================================================================= */
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/* Utility Assembler Functions */
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/* ================================================================= */
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/* ====================================================================== */
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/* Those of a delicate disposition might like to skip the next couple of
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* pages.
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*
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* These functions are drop in replacements for memmove and
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* memset(_, 0, _). However their five instances add at least a kilobyte
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* to the object file. You have been warned.
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*
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* Not a great fan of assembler for the sake of it, but I think
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* that these routines are at least 10 times faster than their C
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* equivalents for large blits, and that's important to the lowest level of
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* a graphics driver. Question is whether some scheme with the blitter
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* would be faster. I suspect not for simple text system - not much
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* asynchrony.
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*
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* Code is very simple, just gruesome expansion. Basic strategy is to
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* increase data moved/cleared at each step to 16 bytes to reduce
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* instruction per data move overhead. movem might be faster still
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* For more than 15 bytes, we try to align the write direction on a
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* longword boundary to get maximum speed. This is even more gruesome.
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* Unaligned read/write used requires 68020+ - think this is a problem?
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*
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* Sorry!
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*/
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/* ++roman: I've optimized Robert's original versions in some minor
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* aspects, e.g. moveq instead of movel, let gcc choose the registers,
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* use movem in some places...
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* For other modes than 1 plane, lots of more such assembler functions
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* were needed (e.g. the ones using movep or expanding color values).
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*/
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/* ++andreas: more optimizations:
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subl #65536,d0 replaced by clrw d0; subql #1,d0 for dbcc
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addal is faster than addaw
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movep is rather expensive compared to ordinary move's
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some functions rewritten in C for clarity, no speed loss */
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static inline void *fb_memclear_small(void *s, size_t count)
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{
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if (!count)
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return 0;
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asm volatile ("\n"
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" lsr.l #1,%1 ; jcc 1f ; move.b %2,-(%0)\n"
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"1: lsr.l #1,%1 ; jcc 1f ; move.w %2,-(%0)\n"
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"1: lsr.l #1,%1 ; jcc 1f ; move.l %2,-(%0)\n"
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"1: lsr.l #1,%1 ; jcc 1f ; move.l %2,-(%0) ; move.l %2,-(%0)\n"
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"1:"
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: "=a" (s), "=d" (count)
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: "d" (0), "0" ((char *)s + count), "1" (count));
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asm volatile ("\n"
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" subq.l #1,%1\n"
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" jcs 3f\n"
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" move.l %2,%%d4; move.l %2,%%d5; move.l %2,%%d6\n"
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"2: movem.l %2/%%d4/%%d5/%%d6,-(%0)\n"
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" dbra %1,2b\n"
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"3:"
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: "=a" (s), "=d" (count)
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: "d" (0), "0" (s), "1" (count)
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: "d4", "d5", "d6"
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);
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return 0;
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}
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static inline void *fb_memclear(void *s, size_t count)
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{
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if (!count)
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return 0;
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if (count < 16) {
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asm volatile ("\n"
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" lsr.l #1,%1 ; jcc 1f ; clr.b (%0)+\n"
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"1: lsr.l #1,%1 ; jcc 1f ; clr.w (%0)+\n"
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"1: lsr.l #1,%1 ; jcc 1f ; clr.l (%0)+\n"
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"1: lsr.l #1,%1 ; jcc 1f ; clr.l (%0)+ ; clr.l (%0)+\n"
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"1:"
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: "=a" (s), "=d" (count)
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: "0" (s), "1" (count));
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} else {
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long tmp;
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asm volatile ("\n"
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" move.l %1,%2\n"
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" lsr.l #1,%2 ; jcc 1f ; clr.b (%0)+ ; subq.w #1,%1\n"
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" lsr.l #1,%2 ; jcs 2f\n" /* %0 increased=>bit 2 switched*/
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" clr.w (%0)+ ; subq.w #2,%1 ; jra 2f\n"
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"1: lsr.l #1,%2 ; jcc 2f\n"
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" clr.w (%0)+ ; subq.w #2,%1\n"
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"2: move.w %1,%2; lsr.l #2,%1 ; jeq 6f\n"
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" lsr.l #1,%1 ; jcc 3f ; clr.l (%0)+\n"
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"3: lsr.l #1,%1 ; jcc 4f ; clr.l (%0)+ ; clr.l (%0)+\n"
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"4: subq.l #1,%1 ; jcs 6f\n"
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"5: clr.l (%0)+; clr.l (%0)+ ; clr.l (%0)+ ; clr.l (%0)+\n"
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" dbra %1,5b ; clr.w %1; subq.l #1,%1; jcc 5b\n"
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"6: move.w %2,%1; btst #1,%1 ; jeq 7f ; clr.w (%0)+\n"
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"7: btst #0,%1 ; jeq 8f ; clr.b (%0)+\n"
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"8:"
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: "=a" (s), "=d" (count), "=d" (tmp)
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: "0" (s), "1" (count));
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}
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return 0;
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}
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static inline void *fb_memset255(void *s, size_t count)
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{
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if (!count)
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return 0;
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asm volatile ("\n"
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" lsr.l #1,%1 ; jcc 1f ; move.b %2,-(%0)\n"
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"1: lsr.l #1,%1 ; jcc 1f ; move.w %2,-(%0)\n"
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"1: lsr.l #1,%1 ; jcc 1f ; move.l %2,-(%0)\n"
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"1: lsr.l #1,%1 ; jcc 1f ; move.l %2,-(%0) ; move.l %2,-(%0)\n"
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"1:"
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: "=a" (s), "=d" (count)
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: "d" (-1), "0" ((char *)s+count), "1" (count));
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asm volatile ("\n"
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" subq.l #1,%1 ; jcs 3f\n"
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" move.l %2,%%d4; move.l %2,%%d5; move.l %2,%%d6\n"
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"2: movem.l %2/%%d4/%%d5/%%d6,-(%0)\n"
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" dbra %1,2b\n"
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"3:"
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: "=a" (s), "=d" (count)
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: "d" (-1), "0" (s), "1" (count)
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: "d4", "d5", "d6");
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return 0;
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}
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static inline void *fb_memmove(void *d, const void *s, size_t count)
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{
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if (d < s) {
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if (count < 16) {
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asm volatile ("\n"
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" lsr.l #1,%2 ; jcc 1f ; move.b (%1)+,(%0)+\n"
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"1: lsr.l #1,%2 ; jcc 1f ; move.w (%1)+,(%0)+\n"
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"1: lsr.l #1,%2 ; jcc 1f ; move.l (%1)+,(%0)+\n"
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"1: lsr.l #1,%2 ; jcc 1f ; move.l (%1)+,(%0)+ ; move.l (%1)+,(%0)+\n"
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"1:"
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: "=a" (d), "=a" (s), "=d" (count)
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: "0" (d), "1" (s), "2" (count));
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} else {
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long tmp;
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asm volatile ("\n"
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" move.l %0,%3\n"
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" lsr.l #1,%3 ; jcc 1f ; move.b (%1)+,(%0)+ ; subqw #1,%2\n"
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" lsr.l #1,%3 ; jcs 2f\n" /* %0 increased=>bit 2 switched*/
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" move.w (%1)+,(%0)+ ; subqw #2,%2 ; jra 2f\n"
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"1: lsr.l #1,%3 ; jcc 2f\n"
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" move.w (%1)+,(%0)+ ; subqw #2,%2\n"
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"2: move.w %2,%-; lsr.l #2,%2 ; jeq 6f\n"
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" lsr.l #1,%2 ; jcc 3f ; move.l (%1)+,(%0)+\n"
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"3: lsr.l #1,%2 ; jcc 4f ; move.l (%1)+,(%0)+ ; move.l (%1)+,(%0)+\n"
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"4: subq.l #1,%2 ; jcs 6f\n"
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"5: move.l (%1)+,(%0)+; move.l (%1)+,(%0)+\n"
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" move.l (%1)+,(%0)+; move.l (%1)+,(%0)+\n"
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" dbra %2,5b ; clr.w %2; subq.l #1,%2; jcc 5b\n"
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"6: move.w %+,%2; btst #1,%2 ; jeq 7f ; move.w (%1)+,(%0)+\n"
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"7: btst #0,%2 ; jeq 8f ; move.b (%1)+,(%0)+\n"
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"8:"
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: "=a" (d), "=a" (s), "=d" (count), "=d" (tmp)
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: "0" (d), "1" (s), "2" (count));
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}
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} else {
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if (count < 16) {
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asm volatile ("\n"
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" lsr.l #1,%2 ; jcc 1f ; move.b -(%1),-(%0)\n"
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"1: lsr.l #1,%2 ; jcc 1f ; move.w -(%1),-(%0)\n"
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"1: lsr.l #1,%2 ; jcc 1f ; move.l -(%1),-(%0)\n"
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"1: lsr.l #1,%2 ; jcc 1f ; move.l -(%1),-(%0) ; move.l -(%1),-(%0)\n"
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"1:"
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: "=a" (d), "=a" (s), "=d" (count)
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: "0" ((char *) d + count), "1" ((char *) s + count), "2" (count));
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} else {
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long tmp;
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asm volatile ("\n"
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" move.l %0,%3\n"
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" lsr.l #1,%3 ; jcc 1f ; move.b -(%1),-(%0) ; subqw #1,%2\n"
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" lsr.l #1,%3 ; jcs 2f\n" /* %0 increased=>bit 2 switched*/
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" move.w -(%1),-(%0) ; subqw #2,%2 ; jra 2f\n"
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"1: lsr.l #1,%3 ; jcc 2f\n"
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" move.w -(%1),-(%0) ; subqw #2,%2\n"
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"2: move.w %2,%-; lsr.l #2,%2 ; jeq 6f\n"
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" lsr.l #1,%2 ; jcc 3f ; move.l -(%1),-(%0)\n"
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"3: lsr.l #1,%2 ; jcc 4f ; move.l -(%1),-(%0) ; move.l -(%1),-(%0)\n"
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"4: subq.l #1,%2 ; jcs 6f\n"
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"5: move.l -(%1),-(%0); move.l -(%1),-(%0)\n"
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" move.l -(%1),-(%0); move.l -(%1),-(%0)\n"
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" dbra %2,5b ; clr.w %2; subq.l #1,%2; jcc 5b\n"
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"6: move.w %+,%2; btst #1,%2 ; jeq 7f ; move.w -(%1),-(%0)\n"
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"7: btst #0,%2 ; jeq 8f ; move.b -(%1),-(%0)\n"
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"8:"
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: "=a" (d), "=a" (s), "=d" (count), "=d" (tmp)
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: "0" ((char *) d + count), "1" ((char *) s + count), "2" (count));
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}
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}
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return 0;
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}
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/* ++andreas: Simple and fast version of memmove, assumes size is
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divisible by 16, suitable for moving the whole screen bitplane */
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static inline void fast_memmove(char *dst, const char *src, size_t size)
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{
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if (!size)
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return;
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if (dst < src)
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asm volatile ("\n"
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"1: movem.l (%0)+,%%d0/%%d1/%%a0/%%a1\n"
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" movem.l %%d0/%%d1/%%a0/%%a1,%1@\n"
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" addq.l #8,%1; addq.l #8,%1\n"
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" dbra %2,1b\n"
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" clr.w %2; subq.l #1,%2\n"
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" jcc 1b"
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: "=a" (src), "=a" (dst), "=d" (size)
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: "0" (src), "1" (dst), "2" (size / 16 - 1)
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: "d0", "d1", "a0", "a1", "memory");
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else
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asm volatile ("\n"
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"1: subq.l #8,%0; subq.l #8,%0\n"
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" movem.l %0@,%%d0/%%d1/%%a0/%%a1\n"
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" movem.l %%d0/%%d1/%%a0/%%a1,-(%1)\n"
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" dbra %2,1b\n"
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" clr.w %2; subq.l #1,%2\n"
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" jcc 1b"
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: "=a" (src), "=a" (dst), "=d" (size)
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: "0" (src + size), "1" (dst + size), "2" (size / 16 - 1)
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: "d0", "d1", "a0", "a1", "memory");
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}
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#ifdef BPL
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/*
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* This expands a up to 8 bit color into two longs
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* for movel operations.
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*/
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static const u32 four2long[] = {
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0x00000000, 0x000000ff, 0x0000ff00, 0x0000ffff,
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0x00ff0000, 0x00ff00ff, 0x00ffff00, 0x00ffffff,
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0xff000000, 0xff0000ff, 0xff00ff00, 0xff00ffff,
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0xffff0000, 0xffff00ff, 0xffffff00, 0xffffffff,
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};
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static inline void expand8_col2mask(u8 c, u32 m[])
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{
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m[0] = four2long[c & 15];
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#if BPL > 4
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m[1] = four2long[c >> 4];
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#endif
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}
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static inline void expand8_2col2mask(u8 fg, u8 bg, u32 fgm[], u32 bgm[])
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{
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fgm[0] = four2long[fg & 15] ^ (bgm[0] = four2long[bg & 15]);
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#if BPL > 4
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fgm[1] = four2long[fg >> 4] ^ (bgm[1] = four2long[bg >> 4]);
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#endif
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}
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/*
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* set an 8bit value to a color
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*/
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static inline void fill8_col(u8 *dst, u32 m[])
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{
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u32 tmp = m[0];
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dst[0] = tmp;
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dst[2] = (tmp >>= 8);
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#if BPL > 2
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dst[4] = (tmp >>= 8);
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dst[6] = tmp >> 8;
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#endif
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#if BPL > 4
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tmp = m[1];
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dst[8] = tmp;
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dst[10] = (tmp >>= 8);
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dst[12] = (tmp >>= 8);
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dst[14] = tmp >> 8;
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#endif
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}
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/*
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* set an 8bit value according to foreground/background color
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*/
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static inline void fill8_2col(u8 *dst, u8 fg, u8 bg, u32 mask)
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{
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u32 fgm[2], bgm[2], tmp;
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expand8_2col2mask(fg, bg, fgm, bgm);
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mask |= mask << 8;
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#if BPL > 2
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mask |= mask << 16;
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#endif
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tmp = (mask & fgm[0]) ^ bgm[0];
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dst[0] = tmp;
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dst[2] = (tmp >>= 8);
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#if BPL > 2
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dst[4] = (tmp >>= 8);
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dst[6] = tmp >> 8;
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#endif
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#if BPL > 4
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tmp = (mask & fgm[1]) ^ bgm[1];
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dst[8] = tmp;
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dst[10] = (tmp >>= 8);
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dst[12] = (tmp >>= 8);
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dst[14] = tmp >> 8;
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#endif
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}
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static const u32 two2word[] = {
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0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
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};
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static inline void expand16_col2mask(u8 c, u32 m[])
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{
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m[0] = two2word[c & 3];
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#if BPL > 2
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m[1] = two2word[(c >> 2) & 3];
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#endif
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#if BPL > 4
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m[2] = two2word[(c >> 4) & 3];
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m[3] = two2word[c >> 6];
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#endif
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}
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static inline void expand16_2col2mask(u8 fg, u8 bg, u32 fgm[], u32 bgm[])
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{
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bgm[0] = two2word[bg & 3];
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fgm[0] = two2word[fg & 3] ^ bgm[0];
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#if BPL > 2
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bgm[1] = two2word[(bg >> 2) & 3];
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fgm[1] = two2word[(fg >> 2) & 3] ^ bgm[1];
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#endif
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#if BPL > 4
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bgm[2] = two2word[(bg >> 4) & 3];
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fgm[2] = two2word[(fg >> 4) & 3] ^ bgm[2];
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bgm[3] = two2word[bg >> 6];
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fgm[3] = two2word[fg >> 6] ^ bgm[3];
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#endif
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}
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static inline u32 *fill16_col(u32 *dst, int rows, u32 m[])
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{
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while (rows) {
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*dst++ = m[0];
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#if BPL > 2
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*dst++ = m[1];
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#endif
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#if BPL > 4
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*dst++ = m[2];
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*dst++ = m[3];
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#endif
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rows--;
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}
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return dst;
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}
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static inline void memmove32_col(void *dst, void *src, u32 mask, u32 h, u32 bytes)
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{
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u32 *s, *d, v;
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s = src;
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d = dst;
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do {
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v = (*s++ & mask) | (*d & ~mask);
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*d++ = v;
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#if BPL > 2
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v = (*s++ & mask) | (*d & ~mask);
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*d++ = v;
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#endif
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#if BPL > 4
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v = (*s++ & mask) | (*d & ~mask);
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*d++ = v;
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v = (*s++ & mask) | (*d & ~mask);
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*d++ = v;
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#endif
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d = (u32 *)((u8 *)d + bytes);
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s = (u32 *)((u8 *)s + bytes);
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} while (--h);
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}
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#endif
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#endif /* _VIDEO_ATAFB_UTILS_H */
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