]>
git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - arch/x86/lib/mmx_32.c
2 * MMX 3DNow! library helper functions
5 * We can use MMX just for prefetch in IRQ's. This may be a win.
6 * (reported so on K6-III)
7 * We should use a better code neutral filler for the short jump
8 * leal ebx. [ebx] is apparently best for K6-2, but Cyrix ??
9 * We also want to clobber the filler register so we don't get any
10 * register forwarding stalls on the filler.
12 * Add *user handling. Checksums are not a win with MMX on any CPU
13 * tested so far for any MMX solution figured.
15 * 22/09/2000 - Arjan van de Ven
16 * Improved for non-egineering-sample Athlons
19 #include <linux/hardirq.h>
20 #include <linux/string.h>
21 #include <linux/module.h>
22 #include <linux/sched.h>
23 #include <linux/types.h>
28 void *_mmx_memcpy(void *to
, const void *from
, size_t len
)
33 if (unlikely(in_interrupt()))
34 return __memcpy(to
, from
, len
);
37 i
= len
>> 6; /* len/64 */
41 __asm__
__volatile__ (
42 "1: prefetch (%0)\n" /* This set is 28 bytes */
48 ".section .fixup, \"ax\"\n"
49 "3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */
56 __asm__
__volatile__ (
57 "1: prefetch 320(%0)\n"
58 "2: movq (%0), %%mm0\n"
59 " movq 8(%0), %%mm1\n"
60 " movq 16(%0), %%mm2\n"
61 " movq 24(%0), %%mm3\n"
63 " movq %%mm1, 8(%1)\n"
64 " movq %%mm2, 16(%1)\n"
65 " movq %%mm3, 24(%1)\n"
66 " movq 32(%0), %%mm0\n"
67 " movq 40(%0), %%mm1\n"
68 " movq 48(%0), %%mm2\n"
69 " movq 56(%0), %%mm3\n"
70 " movq %%mm0, 32(%1)\n"
71 " movq %%mm1, 40(%1)\n"
72 " movq %%mm2, 48(%1)\n"
73 " movq %%mm3, 56(%1)\n"
74 ".section .fixup, \"ax\"\n"
75 "3: movw $0x05EB, 1b\n" /* jmp on 5 bytes */
79 : : "r" (from
), "r" (to
) : "memory");
86 __asm__
__volatile__ (
88 " movq 8(%0), %%mm1\n"
89 " movq 16(%0), %%mm2\n"
90 " movq 24(%0), %%mm3\n"
92 " movq %%mm1, 8(%1)\n"
93 " movq %%mm2, 16(%1)\n"
94 " movq %%mm3, 24(%1)\n"
95 " movq 32(%0), %%mm0\n"
96 " movq 40(%0), %%mm1\n"
97 " movq 48(%0), %%mm2\n"
98 " movq 56(%0), %%mm3\n"
99 " movq %%mm0, 32(%1)\n"
100 " movq %%mm1, 40(%1)\n"
101 " movq %%mm2, 48(%1)\n"
102 " movq %%mm3, 56(%1)\n"
103 : : "r" (from
), "r" (to
) : "memory");
109 * Now do the tail of the block:
111 __memcpy(to
, from
, len
& 63);
116 EXPORT_SYMBOL(_mmx_memcpy
);
121 * The K7 has streaming cache bypass load/store. The Cyrix III, K6 and
122 * other MMX using processors do not.
125 static void fast_clear_page(void *page
)
131 __asm__
__volatile__ (
132 " pxor %%mm0, %%mm0\n" : :
135 for (i
= 0; i
< 4096/64; i
++) {
136 __asm__
__volatile__ (
137 " movntq %%mm0, (%0)\n"
138 " movntq %%mm0, 8(%0)\n"
139 " movntq %%mm0, 16(%0)\n"
140 " movntq %%mm0, 24(%0)\n"
141 " movntq %%mm0, 32(%0)\n"
142 " movntq %%mm0, 40(%0)\n"
143 " movntq %%mm0, 48(%0)\n"
144 " movntq %%mm0, 56(%0)\n"
145 : : "r" (page
) : "memory");
150 * Since movntq is weakly-ordered, a "sfence" is needed to become
153 __asm__
__volatile__("sfence\n"::);
158 static void fast_copy_page(void *to
, void *from
)
165 * maybe the prefetch stuff can go before the expensive fnsave...
166 * but that is for later. -AV
168 __asm__
__volatile__(
171 " prefetch 128(%0)\n"
172 " prefetch 192(%0)\n"
173 " prefetch 256(%0)\n"
175 ".section .fixup, \"ax\"\n"
176 "3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */
179 _ASM_EXTABLE(1b
, 3b
) : : "r" (from
));
181 for (i
= 0; i
< (4096-320)/64; i
++) {
182 __asm__
__volatile__ (
183 "1: prefetch 320(%0)\n"
184 "2: movq (%0), %%mm0\n"
185 " movntq %%mm0, (%1)\n"
186 " movq 8(%0), %%mm1\n"
187 " movntq %%mm1, 8(%1)\n"
188 " movq 16(%0), %%mm2\n"
189 " movntq %%mm2, 16(%1)\n"
190 " movq 24(%0), %%mm3\n"
191 " movntq %%mm3, 24(%1)\n"
192 " movq 32(%0), %%mm4\n"
193 " movntq %%mm4, 32(%1)\n"
194 " movq 40(%0), %%mm5\n"
195 " movntq %%mm5, 40(%1)\n"
196 " movq 48(%0), %%mm6\n"
197 " movntq %%mm6, 48(%1)\n"
198 " movq 56(%0), %%mm7\n"
199 " movntq %%mm7, 56(%1)\n"
200 ".section .fixup, \"ax\"\n"
201 "3: movw $0x05EB, 1b\n" /* jmp on 5 bytes */
204 _ASM_EXTABLE(1b
, 3b
) : : "r" (from
), "r" (to
) : "memory");
210 for (i
= (4096-320)/64; i
< 4096/64; i
++) {
211 __asm__
__volatile__ (
212 "2: movq (%0), %%mm0\n"
213 " movntq %%mm0, (%1)\n"
214 " movq 8(%0), %%mm1\n"
215 " movntq %%mm1, 8(%1)\n"
216 " movq 16(%0), %%mm2\n"
217 " movntq %%mm2, 16(%1)\n"
218 " movq 24(%0), %%mm3\n"
219 " movntq %%mm3, 24(%1)\n"
220 " movq 32(%0), %%mm4\n"
221 " movntq %%mm4, 32(%1)\n"
222 " movq 40(%0), %%mm5\n"
223 " movntq %%mm5, 40(%1)\n"
224 " movq 48(%0), %%mm6\n"
225 " movntq %%mm6, 48(%1)\n"
226 " movq 56(%0), %%mm7\n"
227 " movntq %%mm7, 56(%1)\n"
228 : : "r" (from
), "r" (to
) : "memory");
233 * Since movntq is weakly-ordered, a "sfence" is needed to become
236 __asm__
__volatile__("sfence \n"::);
240 #else /* CONFIG_MK7 */
243 * Generic MMX implementation without K7 specific streaming
245 static void fast_clear_page(void *page
)
251 __asm__
__volatile__ (
252 " pxor %%mm0, %%mm0\n" : :
255 for (i
= 0; i
< 4096/128; i
++) {
256 __asm__
__volatile__ (
257 " movq %%mm0, (%0)\n"
258 " movq %%mm0, 8(%0)\n"
259 " movq %%mm0, 16(%0)\n"
260 " movq %%mm0, 24(%0)\n"
261 " movq %%mm0, 32(%0)\n"
262 " movq %%mm0, 40(%0)\n"
263 " movq %%mm0, 48(%0)\n"
264 " movq %%mm0, 56(%0)\n"
265 " movq %%mm0, 64(%0)\n"
266 " movq %%mm0, 72(%0)\n"
267 " movq %%mm0, 80(%0)\n"
268 " movq %%mm0, 88(%0)\n"
269 " movq %%mm0, 96(%0)\n"
270 " movq %%mm0, 104(%0)\n"
271 " movq %%mm0, 112(%0)\n"
272 " movq %%mm0, 120(%0)\n"
273 : : "r" (page
) : "memory");
280 static void fast_copy_page(void *to
, void *from
)
286 __asm__
__volatile__ (
289 " prefetch 128(%0)\n"
290 " prefetch 192(%0)\n"
291 " prefetch 256(%0)\n"
293 ".section .fixup, \"ax\"\n"
294 "3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */
297 _ASM_EXTABLE(1b
, 3b
) : : "r" (from
));
299 for (i
= 0; i
< 4096/64; i
++) {
300 __asm__
__volatile__ (
301 "1: prefetch 320(%0)\n"
302 "2: movq (%0), %%mm0\n"
303 " movq 8(%0), %%mm1\n"
304 " movq 16(%0), %%mm2\n"
305 " movq 24(%0), %%mm3\n"
306 " movq %%mm0, (%1)\n"
307 " movq %%mm1, 8(%1)\n"
308 " movq %%mm2, 16(%1)\n"
309 " movq %%mm3, 24(%1)\n"
310 " movq 32(%0), %%mm0\n"
311 " movq 40(%0), %%mm1\n"
312 " movq 48(%0), %%mm2\n"
313 " movq 56(%0), %%mm3\n"
314 " movq %%mm0, 32(%1)\n"
315 " movq %%mm1, 40(%1)\n"
316 " movq %%mm2, 48(%1)\n"
317 " movq %%mm3, 56(%1)\n"
318 ".section .fixup, \"ax\"\n"
319 "3: movw $0x05EB, 1b\n" /* jmp on 5 bytes */
323 : : "r" (from
), "r" (to
) : "memory");
331 #endif /* !CONFIG_MK7 */
334 * Favour MMX for page clear and copy:
336 static void slow_zero_page(void *page
)
340 __asm__
__volatile__(
344 : "=&c" (d0
), "=&D" (d1
)
345 :"a" (0), "1" (page
), "0" (1024)
349 void mmx_clear_page(void *page
)
351 if (unlikely(in_interrupt()))
352 slow_zero_page(page
);
354 fast_clear_page(page
);
356 EXPORT_SYMBOL(mmx_clear_page
);
358 static void slow_copy_page(void *to
, void *from
)
362 __asm__
__volatile__(
365 : "=&c" (d0
), "=&D" (d1
), "=&S" (d2
)
366 : "0" (1024), "1" ((long) to
), "2" ((long) from
)
370 void mmx_copy_page(void *to
, void *from
)
372 if (unlikely(in_interrupt()))
373 slow_copy_page(to
, from
);
375 fast_copy_page(to
, from
);
377 EXPORT_SYMBOL(mmx_copy_page
);