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marcus.erl |
#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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| 171 |
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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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| 175 |
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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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| 179 |
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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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| 183 |
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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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| 187 |
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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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| 190 |
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| 191 |
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asm volatile ("\n"
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| 192 |
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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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| 194 |
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" lsr.l #1,%3 ; jcs 2f\n" /* %0 increased=>bit 2 switched*/
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| 195 |
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" move.w -(%1),-(%0) ; subqw #2,%2 ; jra 2f\n"
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| 196 |
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"1: lsr.l #1,%3 ; jcc 2f\n"
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| 197 |
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" move.w -(%1),-(%0) ; subqw #2,%2\n"
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| 198 |
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"2: move.w %2,%-; lsr.l #2,%2 ; jeq 6f\n"
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| 199 |
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" lsr.l #1,%2 ; jcc 3f ; move.l -(%1),-(%0)\n"
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| 200 |
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"3: lsr.l #1,%2 ; jcc 4f ; move.l -(%1),-(%0) ; move.l -(%1),-(%0)\n"
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| 201 |
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"4: subq.l #1,%2 ; jcs 6f\n"
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| 202 |
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"5: move.l -(%1),-(%0); move.l -(%1),-(%0)\n"
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| 203 |
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" move.l -(%1),-(%0); move.l -(%1),-(%0)\n"
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| 204 |
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" dbra %2,5b ; clr.w %2; subq.l #1,%2; jcc 5b\n"
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| 205 |
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"6: move.w %+,%2; btst #1,%2 ; jeq 7f ; move.w -(%1),-(%0)\n"
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| 206 |
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"7: btst #0,%2 ; jeq 8f ; move.b -(%1),-(%0)\n"
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| 207 |
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"8:"
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| 208 |
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: "=a" (d), "=a" (s), "=d" (count), "=d" (tmp)
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| 209 |
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: "0" ((char *) d + count), "1" ((char *) s + count), "2" (count));
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| 210 |
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}
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| 211 |
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}
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| 212 |
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| 213 |
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return 0;
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| 214 |
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}
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| 215 |
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| 216 |
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| 217 |
|
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/* ++andreas: Simple and fast version of memmove, assumes size is
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| 218 |
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divisible by 16, suitable for moving the whole screen bitplane */
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| 219 |
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static inline void fast_memmove(char *dst, const char *src, size_t size)
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| 220 |
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{
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| 221 |
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if (!size)
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| 222 |
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return;
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| 223 |
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if (dst < src)
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| 224 |
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asm volatile ("\n"
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| 225 |
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"1: movem.l (%0)+,%%d0/%%d1/%%a0/%%a1\n"
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| 226 |
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" movem.l %%d0/%%d1/%%a0/%%a1,%1@\n"
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| 227 |
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" addq.l #8,%1; addq.l #8,%1\n"
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| 228 |
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" dbra %2,1b\n"
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| 229 |
|
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" clr.w %2; subq.l #1,%2\n"
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| 230 |
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" jcc 1b"
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| 231 |
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: "=a" (src), "=a" (dst), "=d" (size)
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| 232 |
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: "0" (src), "1" (dst), "2" (size / 16 - 1)
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| 233 |
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: "d0", "d1", "a0", "a1", "memory");
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| 234 |
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else
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| 235 |
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asm volatile ("\n"
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| 236 |
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"1: subq.l #8,%0; subq.l #8,%0\n"
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| 237 |
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" movem.l %0@,%%d0/%%d1/%%a0/%%a1\n"
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| 238 |
|
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" movem.l %%d0/%%d1/%%a0/%%a1,-(%1)\n"
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| 239 |
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" dbra %2,1b\n"
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| 240 |
|
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" clr.w %2; subq.l #1,%2\n"
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| 241 |
|
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" jcc 1b"
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| 242 |
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: "=a" (src), "=a" (dst), "=d" (size)
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| 243 |
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: "0" (src + size), "1" (dst + size), "2" (size / 16 - 1)
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| 244 |
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: "d0", "d1", "a0", "a1", "memory");
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| 245 |
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}
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| 246 |
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|
| 247 |
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#ifdef BPL
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| 248 |
|
|
|
| 249 |
|
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/*
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| 250 |
|
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* This expands a up to 8 bit color into two longs
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| 251 |
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* for movel operations.
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| 252 |
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*/
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| 253 |
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static const u32 four2long[] = {
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| 254 |
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0x00000000, 0x000000ff, 0x0000ff00, 0x0000ffff,
|
| 255 |
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0x00ff0000, 0x00ff00ff, 0x00ffff00, 0x00ffffff,
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| 256 |
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0xff000000, 0xff0000ff, 0xff00ff00, 0xff00ffff,
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| 257 |
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0xffff0000, 0xffff00ff, 0xffffff00, 0xffffffff,
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| 258 |
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};
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| 259 |
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|
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| 260 |
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static inline void expand8_col2mask(u8 c, u32 m[])
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| 261 |
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{
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| 262 |
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m[0] = four2long[c & 15];
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| 263 |
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#if BPL > 4
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| 264 |
|
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m[1] = four2long[c >> 4];
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| 265 |
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#endif
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| 266 |
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}
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| 267 |
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|
|
| 268 |
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static inline void expand8_2col2mask(u8 fg, u8 bg, u32 fgm[], u32 bgm[])
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| 269 |
|
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{
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| 270 |
|
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fgm[0] = four2long[fg & 15] ^ (bgm[0] = four2long[bg & 15]);
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| 271 |
|
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#if BPL > 4
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| 272 |
|
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fgm[1] = four2long[fg >> 4] ^ (bgm[1] = four2long[bg >> 4]);
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| 273 |
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#endif
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| 274 |
|
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}
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| 275 |
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|
| 276 |
|
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/*
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| 277 |
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* set an 8bit value to a color
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| 278 |
|
|
*/
|
| 279 |
|
|
static inline void fill8_col(u8 *dst, u32 m[])
|
| 280 |
|
|
{
|
| 281 |
|
|
u32 tmp = m[0];
|
| 282 |
|
|
dst[0] = tmp;
|
| 283 |
|
|
dst[2] = (tmp >>= 8);
|
| 284 |
|
|
#if BPL > 2
|
| 285 |
|
|
dst[4] = (tmp >>= 8);
|
| 286 |
|
|
dst[6] = tmp >> 8;
|
| 287 |
|
|
#endif
|
| 288 |
|
|
#if BPL > 4
|
| 289 |
|
|
tmp = m[1];
|
| 290 |
|
|
dst[8] = tmp;
|
| 291 |
|
|
dst[10] = (tmp >>= 8);
|
| 292 |
|
|
dst[12] = (tmp >>= 8);
|
| 293 |
|
|
dst[14] = tmp >> 8;
|
| 294 |
|
|
#endif
|
| 295 |
|
|
}
|
| 296 |
|
|
|
| 297 |
|
|
/*
|
| 298 |
|
|
* set an 8bit value according to foreground/background color
|
| 299 |
|
|
*/
|
| 300 |
|
|
static inline void fill8_2col(u8 *dst, u8 fg, u8 bg, u32 mask)
|
| 301 |
|
|
{
|
| 302 |
|
|
u32 fgm[2], bgm[2], tmp;
|
| 303 |
|
|
|
| 304 |
|
|
expand8_2col2mask(fg, bg, fgm, bgm);
|
| 305 |
|
|
|
| 306 |
|
|
mask |= mask << 8;
|
| 307 |
|
|
#if BPL > 2
|
| 308 |
|
|
mask |= mask << 16;
|
| 309 |
|
|
#endif
|
| 310 |
|
|
tmp = (mask & fgm[0]) ^ bgm[0];
|
| 311 |
|
|
dst[0] = tmp;
|
| 312 |
|
|
dst[2] = (tmp >>= 8);
|
| 313 |
|
|
#if BPL > 2
|
| 314 |
|
|
dst[4] = (tmp >>= 8);
|
| 315 |
|
|
dst[6] = tmp >> 8;
|
| 316 |
|
|
#endif
|
| 317 |
|
|
#if BPL > 4
|
| 318 |
|
|
tmp = (mask & fgm[1]) ^ bgm[1];
|
| 319 |
|
|
dst[8] = tmp;
|
| 320 |
|
|
dst[10] = (tmp >>= 8);
|
| 321 |
|
|
dst[12] = (tmp >>= 8);
|
| 322 |
|
|
dst[14] = tmp >> 8;
|
| 323 |
|
|
#endif
|
| 324 |
|
|
}
|
| 325 |
|
|
|
| 326 |
|
|
static const u32 two2word[] = {
|
| 327 |
|
|
0x00000000, 0xffff0000, 0x0000ffff, 0xffffffff
|
| 328 |
|
|
};
|
| 329 |
|
|
|
| 330 |
|
|
static inline void expand16_col2mask(u8 c, u32 m[])
|
| 331 |
|
|
{
|
| 332 |
|
|
m[0] = two2word[c & 3];
|
| 333 |
|
|
#if BPL > 2
|
| 334 |
|
|
m[1] = two2word[(c >> 2) & 3];
|
| 335 |
|
|
#endif
|
| 336 |
|
|
#if BPL > 4
|
| 337 |
|
|
m[2] = two2word[(c >> 4) & 3];
|
| 338 |
|
|
m[3] = two2word[c >> 6];
|
| 339 |
|
|
#endif
|
| 340 |
|
|
}
|
| 341 |
|
|
|
| 342 |
|
|
static inline void expand16_2col2mask(u8 fg, u8 bg, u32 fgm[], u32 bgm[])
|
| 343 |
|
|
{
|
| 344 |
|
|
bgm[0] = two2word[bg & 3];
|
| 345 |
|
|
fgm[0] = two2word[fg & 3] ^ bgm[0];
|
| 346 |
|
|
#if BPL > 2
|
| 347 |
|
|
bgm[1] = two2word[(bg >> 2) & 3];
|
| 348 |
|
|
fgm[1] = two2word[(fg >> 2) & 3] ^ bgm[1];
|
| 349 |
|
|
#endif
|
| 350 |
|
|
#if BPL > 4
|
| 351 |
|
|
bgm[2] = two2word[(bg >> 4) & 3];
|
| 352 |
|
|
fgm[2] = two2word[(fg >> 4) & 3] ^ bgm[2];
|
| 353 |
|
|
bgm[3] = two2word[bg >> 6];
|
| 354 |
|
|
fgm[3] = two2word[fg >> 6] ^ bgm[3];
|
| 355 |
|
|
#endif
|
| 356 |
|
|
}
|
| 357 |
|
|
|
| 358 |
|
|
static inline u32 *fill16_col(u32 *dst, int rows, u32 m[])
|
| 359 |
|
|
{
|
| 360 |
|
|
while (rows) {
|
| 361 |
|
|
*dst++ = m[0];
|
| 362 |
|
|
#if BPL > 2
|
| 363 |
|
|
*dst++ = m[1];
|
| 364 |
|
|
#endif
|
| 365 |
|
|
#if BPL > 4
|
| 366 |
|
|
*dst++ = m[2];
|
| 367 |
|
|
*dst++ = m[3];
|
| 368 |
|
|
#endif
|
| 369 |
|
|
rows--;
|
| 370 |
|
|
}
|
| 371 |
|
|
return dst;
|
| 372 |
|
|
}
|
| 373 |
|
|
|
| 374 |
|
|
static inline void memmove32_col(void *dst, void *src, u32 mask, u32 h, u32 bytes)
|
| 375 |
|
|
{
|
| 376 |
|
|
u32 *s, *d, v;
|
| 377 |
|
|
|
| 378 |
|
|
s = src;
|
| 379 |
|
|
d = dst;
|
| 380 |
|
|
do {
|
| 381 |
|
|
v = (*s++ & mask) | (*d & ~mask);
|
| 382 |
|
|
*d++ = v;
|
| 383 |
|
|
#if BPL > 2
|
| 384 |
|
|
v = (*s++ & mask) | (*d & ~mask);
|
| 385 |
|
|
*d++ = v;
|
| 386 |
|
|
#endif
|
| 387 |
|
|
#if BPL > 4
|
| 388 |
|
|
v = (*s++ & mask) | (*d & ~mask);
|
| 389 |
|
|
*d++ = v;
|
| 390 |
|
|
v = (*s++ & mask) | (*d & ~mask);
|
| 391 |
|
|
*d++ = v;
|
| 392 |
|
|
#endif
|
| 393 |
|
|
d = (u32 *)((u8 *)d + bytes);
|
| 394 |
|
|
s = (u32 *)((u8 *)s + bytes);
|
| 395 |
|
|
} while (--h);
|
| 396 |
|
|
}
|
| 397 |
|
|
|
| 398 |
|
|
#endif
|
| 399 |
|
|
|
| 400 |
|
|
#endif /* _VIDEO_ATAFB_UTILS_H */
|
