150 строки
3.4 KiB
ArmAsm
150 строки
3.4 KiB
ArmAsm
/* bzero.S: Simple prefetching memset, bzero, and clear_user
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* implementations.
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*
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* Copyright (C) 2005 David S. Miller <davem@davemloft.net>
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*/
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.text
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.globl memset
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.type memset, #function
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memset: /* %o0=buf, %o1=pat, %o2=len */
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and %o1, 0xff, %o3
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mov %o2, %o1
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sllx %o3, 8, %g1
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or %g1, %o3, %o2
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sllx %o2, 16, %g1
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or %g1, %o2, %o2
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sllx %o2, 32, %g1
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ba,pt %xcc, 1f
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or %g1, %o2, %o2
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.globl __bzero
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.type __bzero, #function
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__bzero: /* %o0=buf, %o1=len */
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clr %o2
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1: mov %o0, %o3
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brz,pn %o1, __bzero_done
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cmp %o1, 16
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bl,pn %icc, __bzero_tiny
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prefetch [%o0 + 0x000], #n_writes
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andcc %o0, 0x3, %g0
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be,pt %icc, 2f
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1: stb %o2, [%o0 + 0x00]
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add %o0, 1, %o0
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andcc %o0, 0x3, %g0
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bne,pn %icc, 1b
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sub %o1, 1, %o1
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2: andcc %o0, 0x7, %g0
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be,pt %icc, 3f
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stw %o2, [%o0 + 0x00]
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sub %o1, 4, %o1
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add %o0, 4, %o0
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3: and %o1, 0x38, %g1
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cmp %o1, 0x40
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andn %o1, 0x3f, %o4
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bl,pn %icc, 5f
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and %o1, 0x7, %o1
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prefetch [%o0 + 0x040], #n_writes
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prefetch [%o0 + 0x080], #n_writes
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prefetch [%o0 + 0x0c0], #n_writes
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prefetch [%o0 + 0x100], #n_writes
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prefetch [%o0 + 0x140], #n_writes
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4: prefetch [%o0 + 0x180], #n_writes
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stx %o2, [%o0 + 0x00]
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stx %o2, [%o0 + 0x08]
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stx %o2, [%o0 + 0x10]
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stx %o2, [%o0 + 0x18]
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stx %o2, [%o0 + 0x20]
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stx %o2, [%o0 + 0x28]
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stx %o2, [%o0 + 0x30]
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stx %o2, [%o0 + 0x38]
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subcc %o4, 0x40, %o4
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bne,pt %icc, 4b
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add %o0, 0x40, %o0
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brz,pn %g1, 6f
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nop
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5: stx %o2, [%o0 + 0x00]
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subcc %g1, 8, %g1
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bne,pt %icc, 5b
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add %o0, 0x8, %o0
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6: brz,pt %o1, __bzero_done
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nop
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__bzero_tiny:
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1: stb %o2, [%o0 + 0x00]
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subcc %o1, 1, %o1
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bne,pt %icc, 1b
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add %o0, 1, %o0
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__bzero_done:
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retl
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mov %o3, %o0
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.size __bzero, .-__bzero
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.size memset, .-memset
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#define EX_ST(x,y) \
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98: x,y; \
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.section __ex_table,"a";\
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.align 4; \
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.word 98b, __retl_o1; \
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.text; \
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.align 4;
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.globl __clear_user
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.type __clear_user, #function
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__clear_user: /* %o0=buf, %o1=len */
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brz,pn %o1, __clear_user_done
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cmp %o1, 16
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bl,pn %icc, __clear_user_tiny
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EX_ST(prefetcha [%o0 + 0x00] %asi, #n_writes)
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andcc %o0, 0x3, %g0
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be,pt %icc, 2f
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1: EX_ST(stba %g0, [%o0 + 0x00] %asi)
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add %o0, 1, %o0
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andcc %o0, 0x3, %g0
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bne,pn %icc, 1b
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sub %o1, 1, %o1
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2: andcc %o0, 0x7, %g0
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be,pt %icc, 3f
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EX_ST(stwa %g0, [%o0 + 0x00] %asi)
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sub %o1, 4, %o1
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add %o0, 4, %o0
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3: and %o1, 0x38, %g1
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cmp %o1, 0x40
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andn %o1, 0x3f, %o4
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bl,pn %icc, 5f
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and %o1, 0x7, %o1
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EX_ST(prefetcha [%o0 + 0x040] %asi, #n_writes)
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EX_ST(prefetcha [%o0 + 0x080] %asi, #n_writes)
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EX_ST(prefetcha [%o0 + 0x0c0] %asi, #n_writes)
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EX_ST(prefetcha [%o0 + 0x100] %asi, #n_writes)
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EX_ST(prefetcha [%o0 + 0x140] %asi, #n_writes)
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4: EX_ST(prefetcha [%o0 + 0x180] %asi, #n_writes)
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EX_ST(stxa %g0, [%o0 + 0x00] %asi)
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EX_ST(stxa %g0, [%o0 + 0x08] %asi)
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EX_ST(stxa %g0, [%o0 + 0x10] %asi)
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EX_ST(stxa %g0, [%o0 + 0x18] %asi)
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EX_ST(stxa %g0, [%o0 + 0x20] %asi)
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EX_ST(stxa %g0, [%o0 + 0x28] %asi)
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EX_ST(stxa %g0, [%o0 + 0x30] %asi)
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EX_ST(stxa %g0, [%o0 + 0x38] %asi)
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subcc %o4, 0x40, %o4
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bne,pt %icc, 4b
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add %o0, 0x40, %o0
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brz,pn %g1, 6f
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nop
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5: EX_ST(stxa %g0, [%o0 + 0x00] %asi)
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subcc %g1, 8, %g1
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bne,pt %icc, 5b
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add %o0, 0x8, %o0
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6: brz,pt %o1, __clear_user_done
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nop
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__clear_user_tiny:
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1: EX_ST(stba %g0, [%o0 + 0x00] %asi)
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subcc %o1, 1, %o1
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bne,pt %icc, 1b
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add %o0, 1, %o0
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__clear_user_done:
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retl
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clr %o0
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.size __clear_user, .-__clear_user
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