400 lines
8.2 KiB
C
400 lines
8.2 KiB
C
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/sched.h>
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#include <linux/hardirq.h>
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#include <asm/i387.h>
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/*
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* MMX 3DNow! library helper functions
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*
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* To do:
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* We can use MMX just for prefetch in IRQ's. This may be a win.
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* (reported so on K6-III)
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* We should use a better code neutral filler for the short jump
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* leal ebx. [ebx] is apparently best for K6-2, but Cyrix ??
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* We also want to clobber the filler register so we don't get any
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* register forwarding stalls on the filler.
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*
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* Add *user handling. Checksums are not a win with MMX on any CPU
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* tested so far for any MMX solution figured.
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*
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* 22/09/2000 - Arjan van de Ven
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* Improved for non-egineering-sample Athlons
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*
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*/
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void *_mmx_memcpy(void *to, const void *from, size_t len)
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{
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void *p;
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int i;
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if (unlikely(in_interrupt()))
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return __memcpy(to, from, len);
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p = to;
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i = len >> 6; /* len/64 */
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kernel_fpu_begin();
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__asm__ __volatile__ (
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"1: prefetch (%0)\n" /* This set is 28 bytes */
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" prefetch 64(%0)\n"
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" prefetch 128(%0)\n"
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" prefetch 192(%0)\n"
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" prefetch 256(%0)\n"
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"2: \n"
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".section .fixup, \"ax\"\n"
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"3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */
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" jmp 2b\n"
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".previous\n"
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".section __ex_table,\"a\"\n"
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" .align 4\n"
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" .long 1b, 3b\n"
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".previous"
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: : "r" (from) );
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for(; i>5; i--)
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{
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__asm__ __volatile__ (
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"1: prefetch 320(%0)\n"
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"2: movq (%0), %%mm0\n"
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" movq 8(%0), %%mm1\n"
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" movq 16(%0), %%mm2\n"
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" movq 24(%0), %%mm3\n"
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" movq %%mm0, (%1)\n"
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" movq %%mm1, 8(%1)\n"
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" movq %%mm2, 16(%1)\n"
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" movq %%mm3, 24(%1)\n"
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" movq 32(%0), %%mm0\n"
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" movq 40(%0), %%mm1\n"
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" movq 48(%0), %%mm2\n"
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" movq 56(%0), %%mm3\n"
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" movq %%mm0, 32(%1)\n"
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" movq %%mm1, 40(%1)\n"
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" movq %%mm2, 48(%1)\n"
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" movq %%mm3, 56(%1)\n"
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".section .fixup, \"ax\"\n"
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"3: movw $0x05EB, 1b\n" /* jmp on 5 bytes */
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" jmp 2b\n"
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".previous\n"
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".section __ex_table,\"a\"\n"
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" .align 4\n"
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" .long 1b, 3b\n"
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".previous"
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: : "r" (from), "r" (to) : "memory");
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from+=64;
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to+=64;
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}
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for(; i>0; i--)
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{
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__asm__ __volatile__ (
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" movq (%0), %%mm0\n"
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" movq 8(%0), %%mm1\n"
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" movq 16(%0), %%mm2\n"
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" movq 24(%0), %%mm3\n"
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" movq %%mm0, (%1)\n"
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" movq %%mm1, 8(%1)\n"
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" movq %%mm2, 16(%1)\n"
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" movq %%mm3, 24(%1)\n"
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" movq 32(%0), %%mm0\n"
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" movq 40(%0), %%mm1\n"
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" movq 48(%0), %%mm2\n"
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" movq 56(%0), %%mm3\n"
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" movq %%mm0, 32(%1)\n"
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" movq %%mm1, 40(%1)\n"
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" movq %%mm2, 48(%1)\n"
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" movq %%mm3, 56(%1)\n"
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: : "r" (from), "r" (to) : "memory");
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from+=64;
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to+=64;
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}
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/*
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* Now do the tail of the block
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*/
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__memcpy(to, from, len&63);
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kernel_fpu_end();
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return p;
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}
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#ifdef CONFIG_MK7
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/*
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* The K7 has streaming cache bypass load/store. The Cyrix III, K6 and
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* other MMX using processors do not.
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*/
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static void fast_clear_page(void *page)
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{
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int i;
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kernel_fpu_begin();
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__asm__ __volatile__ (
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" pxor %%mm0, %%mm0\n" : :
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);
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for(i=0;i<4096/64;i++)
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{
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__asm__ __volatile__ (
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" movntq %%mm0, (%0)\n"
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" movntq %%mm0, 8(%0)\n"
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" movntq %%mm0, 16(%0)\n"
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" movntq %%mm0, 24(%0)\n"
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" movntq %%mm0, 32(%0)\n"
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" movntq %%mm0, 40(%0)\n"
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" movntq %%mm0, 48(%0)\n"
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" movntq %%mm0, 56(%0)\n"
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: : "r" (page) : "memory");
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page+=64;
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}
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/* since movntq is weakly-ordered, a "sfence" is needed to become
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* ordered again.
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*/
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__asm__ __volatile__ (
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" sfence \n" : :
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);
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kernel_fpu_end();
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}
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static void fast_copy_page(void *to, void *from)
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{
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int i;
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kernel_fpu_begin();
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/* maybe the prefetch stuff can go before the expensive fnsave...
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* but that is for later. -AV
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*/
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__asm__ __volatile__ (
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"1: prefetch (%0)\n"
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" prefetch 64(%0)\n"
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" prefetch 128(%0)\n"
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" prefetch 192(%0)\n"
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" prefetch 256(%0)\n"
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"2: \n"
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".section .fixup, \"ax\"\n"
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"3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */
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" jmp 2b\n"
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".previous\n"
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".section __ex_table,\"a\"\n"
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" .align 4\n"
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" .long 1b, 3b\n"
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".previous"
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: : "r" (from) );
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for(i=0; i<(4096-320)/64; i++)
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{
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__asm__ __volatile__ (
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"1: prefetch 320(%0)\n"
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"2: movq (%0), %%mm0\n"
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" movntq %%mm0, (%1)\n"
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" movq 8(%0), %%mm1\n"
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" movntq %%mm1, 8(%1)\n"
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" movq 16(%0), %%mm2\n"
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" movntq %%mm2, 16(%1)\n"
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" movq 24(%0), %%mm3\n"
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" movntq %%mm3, 24(%1)\n"
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" movq 32(%0), %%mm4\n"
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" movntq %%mm4, 32(%1)\n"
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" movq 40(%0), %%mm5\n"
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" movntq %%mm5, 40(%1)\n"
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" movq 48(%0), %%mm6\n"
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" movntq %%mm6, 48(%1)\n"
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" movq 56(%0), %%mm7\n"
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" movntq %%mm7, 56(%1)\n"
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".section .fixup, \"ax\"\n"
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"3: movw $0x05EB, 1b\n" /* jmp on 5 bytes */
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" jmp 2b\n"
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".previous\n"
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".section __ex_table,\"a\"\n"
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" .align 4\n"
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" .long 1b, 3b\n"
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".previous"
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: : "r" (from), "r" (to) : "memory");
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from+=64;
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to+=64;
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}
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for(i=(4096-320)/64; i<4096/64; i++)
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{
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__asm__ __volatile__ (
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"2: movq (%0), %%mm0\n"
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" movntq %%mm0, (%1)\n"
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" movq 8(%0), %%mm1\n"
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" movntq %%mm1, 8(%1)\n"
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" movq 16(%0), %%mm2\n"
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" movntq %%mm2, 16(%1)\n"
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" movq 24(%0), %%mm3\n"
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" movntq %%mm3, 24(%1)\n"
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" movq 32(%0), %%mm4\n"
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" movntq %%mm4, 32(%1)\n"
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" movq 40(%0), %%mm5\n"
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" movntq %%mm5, 40(%1)\n"
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" movq 48(%0), %%mm6\n"
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" movntq %%mm6, 48(%1)\n"
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" movq 56(%0), %%mm7\n"
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" movntq %%mm7, 56(%1)\n"
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: : "r" (from), "r" (to) : "memory");
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from+=64;
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to+=64;
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}
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/* since movntq is weakly-ordered, a "sfence" is needed to become
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* ordered again.
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*/
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__asm__ __volatile__ (
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" sfence \n" : :
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);
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kernel_fpu_end();
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}
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#else
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/*
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* Generic MMX implementation without K7 specific streaming
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*/
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static void fast_clear_page(void *page)
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{
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int i;
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kernel_fpu_begin();
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__asm__ __volatile__ (
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" pxor %%mm0, %%mm0\n" : :
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);
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for(i=0;i<4096/128;i++)
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{
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__asm__ __volatile__ (
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" movq %%mm0, (%0)\n"
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" movq %%mm0, 8(%0)\n"
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" movq %%mm0, 16(%0)\n"
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" movq %%mm0, 24(%0)\n"
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" movq %%mm0, 32(%0)\n"
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" movq %%mm0, 40(%0)\n"
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" movq %%mm0, 48(%0)\n"
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" movq %%mm0, 56(%0)\n"
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" movq %%mm0, 64(%0)\n"
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" movq %%mm0, 72(%0)\n"
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" movq %%mm0, 80(%0)\n"
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" movq %%mm0, 88(%0)\n"
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" movq %%mm0, 96(%0)\n"
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" movq %%mm0, 104(%0)\n"
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" movq %%mm0, 112(%0)\n"
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" movq %%mm0, 120(%0)\n"
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: : "r" (page) : "memory");
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page+=128;
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}
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kernel_fpu_end();
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}
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static void fast_copy_page(void *to, void *from)
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{
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int i;
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kernel_fpu_begin();
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__asm__ __volatile__ (
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"1: prefetch (%0)\n"
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" prefetch 64(%0)\n"
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" prefetch 128(%0)\n"
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" prefetch 192(%0)\n"
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" prefetch 256(%0)\n"
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"2: \n"
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".section .fixup, \"ax\"\n"
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"3: movw $0x1AEB, 1b\n" /* jmp on 26 bytes */
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" jmp 2b\n"
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".previous\n"
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".section __ex_table,\"a\"\n"
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" .align 4\n"
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" .long 1b, 3b\n"
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".previous"
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: : "r" (from) );
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for(i=0; i<4096/64; i++)
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{
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__asm__ __volatile__ (
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"1: prefetch 320(%0)\n"
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"2: movq (%0), %%mm0\n"
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" movq 8(%0), %%mm1\n"
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" movq 16(%0), %%mm2\n"
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" movq 24(%0), %%mm3\n"
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" movq %%mm0, (%1)\n"
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" movq %%mm1, 8(%1)\n"
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" movq %%mm2, 16(%1)\n"
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" movq %%mm3, 24(%1)\n"
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" movq 32(%0), %%mm0\n"
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" movq 40(%0), %%mm1\n"
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" movq 48(%0), %%mm2\n"
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" movq 56(%0), %%mm3\n"
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" movq %%mm0, 32(%1)\n"
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" movq %%mm1, 40(%1)\n"
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" movq %%mm2, 48(%1)\n"
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" movq %%mm3, 56(%1)\n"
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".section .fixup, \"ax\"\n"
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"3: movw $0x05EB, 1b\n" /* jmp on 5 bytes */
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" jmp 2b\n"
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".previous\n"
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".section __ex_table,\"a\"\n"
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" .align 4\n"
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" .long 1b, 3b\n"
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".previous"
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: : "r" (from), "r" (to) : "memory");
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from+=64;
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to+=64;
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}
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kernel_fpu_end();
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}
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#endif
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/*
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* Favour MMX for page clear and copy.
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*/
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static void slow_zero_page(void * page)
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{
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int d0, d1;
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__asm__ __volatile__( \
|
||
|
|
"cld\n\t" \
|
||
|
|
"rep ; stosl" \
|
||
|
|
: "=&c" (d0), "=&D" (d1)
|
||
|
|
:"a" (0),"1" (page),"0" (1024)
|
||
|
|
:"memory");
|
||
|
|
}
|
||
|
|
|
||
|
|
void mmx_clear_page(void * page)
|
||
|
|
{
|
||
|
|
if(unlikely(in_interrupt()))
|
||
|
|
slow_zero_page(page);
|
||
|
|
else
|
||
|
|
fast_clear_page(page);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void slow_copy_page(void *to, void *from)
|
||
|
|
{
|
||
|
|
int d0, d1, d2;
|
||
|
|
__asm__ __volatile__( \
|
||
|
|
"cld\n\t" \
|
||
|
|
"rep ; movsl" \
|
||
|
|
: "=&c" (d0), "=&D" (d1), "=&S" (d2) \
|
||
|
|
: "0" (1024),"1" ((long) to),"2" ((long) from) \
|
||
|
|
: "memory");
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
void mmx_copy_page(void *to, void *from)
|
||
|
|
{
|
||
|
|
if(unlikely(in_interrupt()))
|
||
|
|
slow_copy_page(to, from);
|
||
|
|
else
|
||
|
|
fast_copy_page(to, from);
|
||
|
|
}
|