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