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69 lines
1.6 KiB
69 lines
1.6 KiB
#include <linux/string.h> |
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#include <linux/module.h> |
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#include <linux/io.h> |
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#define movs(type,to,from) \ |
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asm volatile("movs" type:"=&D" (to), "=&S" (from):"0" (to), "1" (from):"memory") |
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/* Originally from i386/string.h */ |
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static __always_inline void rep_movs(void *to, const void *from, size_t n) |
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{ |
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unsigned long d0, d1, d2; |
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asm volatile("rep ; movsl\n\t" |
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"testb $2,%b4\n\t" |
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"je 1f\n\t" |
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"movsw\n" |
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"1:\ttestb $1,%b4\n\t" |
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"je 2f\n\t" |
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"movsb\n" |
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"2:" |
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: "=&c" (d0), "=&D" (d1), "=&S" (d2) |
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: "0" (n / 4), "q" (n), "1" ((long)to), "2" ((long)from) |
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: "memory"); |
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} |
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void memcpy_fromio(void *to, const volatile void __iomem *from, size_t n) |
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{ |
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if (unlikely(!n)) |
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return; |
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/* Align any unaligned source IO */ |
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if (unlikely(1 & (unsigned long)from)) { |
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movs("b", to, from); |
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n--; |
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} |
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if (n > 1 && unlikely(2 & (unsigned long)from)) { |
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movs("w", to, from); |
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n-=2; |
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} |
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rep_movs(to, (const void *)from, n); |
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} |
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EXPORT_SYMBOL(memcpy_fromio); |
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void memcpy_toio(volatile void __iomem *to, const void *from, size_t n) |
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{ |
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if (unlikely(!n)) |
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return; |
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/* Align any unaligned destination IO */ |
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if (unlikely(1 & (unsigned long)to)) { |
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movs("b", to, from); |
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n--; |
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} |
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if (n > 1 && unlikely(2 & (unsigned long)to)) { |
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movs("w", to, from); |
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n-=2; |
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} |
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rep_movs((void *)to, (const void *) from, n); |
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} |
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EXPORT_SYMBOL(memcpy_toio); |
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void memset_io(volatile void __iomem *a, int b, size_t c) |
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{ |
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/* |
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* TODO: memset can mangle the IO patterns quite a bit. |
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* perhaps it would be better to use a dumb one: |
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*/ |
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memset((void *)a, b, c); |
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} |
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EXPORT_SYMBOL(memset_io);
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