6c70b6fc7b
Check the cpu type in the OBP device tree before committing to using the optimized Niagara memcpy and memset implementation. If we don't recognize the cpu type, use a completely generic version. Signed-off-by: David S. Miller <davem@davemloft.net>
121 lines
1.9 KiB
ArmAsm
121 lines
1.9 KiB
ArmAsm
/* GENmemcpy.S: Generic sparc64 memcpy.
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*
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* Copyright (C) 2007 David S. Miller (davem@davemloft.net)
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*/
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#ifdef __KERNEL__
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#define GLOBAL_SPARE %g7
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#else
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#define GLOBAL_SPARE %g5
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#endif
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#ifndef EX_LD
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#define EX_LD(x) x
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#endif
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#ifndef EX_ST
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#define EX_ST(x) x
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#endif
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#ifndef EX_RETVAL
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#define EX_RETVAL(x) x
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#endif
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#ifndef LOAD
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#define LOAD(type,addr,dest) type [addr], dest
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#endif
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#ifndef STORE
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#define STORE(type,src,addr) type src, [addr]
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#endif
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#ifndef FUNC_NAME
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#define FUNC_NAME GENmemcpy
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#endif
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#ifndef PREAMBLE
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#define PREAMBLE
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#endif
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#ifndef XCC
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#define XCC xcc
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#endif
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.register %g2,#scratch
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.register %g3,#scratch
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.text
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.align 64
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.globl FUNC_NAME
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.type FUNC_NAME,#function
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FUNC_NAME: /* %o0=dst, %o1=src, %o2=len */
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srlx %o2, 31, %g2
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cmp %g2, 0
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tne %XCC, 5
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PREAMBLE
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mov %o0, GLOBAL_SPARE
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cmp %o2, 0
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be,pn %XCC, 85f
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or %o0, %o1, %o3
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cmp %o2, 16
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blu,a,pn %XCC, 80f
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or %o3, %o2, %o3
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xor %o0, %o1, %o4
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andcc %o4, 0x7, %g0
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bne,a,pn %XCC, 90f
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sub %o0, %o1, %o3
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and %o0, 0x7, %o4
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sub %o4, 0x8, %o4
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sub %g0, %o4, %o4
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sub %o2, %o4, %o2
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1: subcc %o4, 1, %o4
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EX_LD(LOAD(ldub, %o1, %g1))
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EX_ST(STORE(stb, %g1, %o0))
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add %o1, 1, %o1
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bne,pt %XCC, 1b
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add %o0, 1, %o0
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andn %o2, 0x7, %g1
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sub %o2, %g1, %o2
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1: subcc %g1, 0x8, %g1
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EX_LD(LOAD(ldx, %o1, %g2))
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EX_ST(STORE(stx, %g2, %o0))
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add %o1, 0x8, %o1
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bne,pt %XCC, 1b
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add %o0, 0x8, %o0
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brz,pt %o2, 85f
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sub %o0, %o1, %o3
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ba,a,pt %XCC, 90f
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.align 64
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80: /* 0 < len <= 16 */
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andcc %o3, 0x3, %g0
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bne,pn %XCC, 90f
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sub %o0, %o1, %o3
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1:
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subcc %o2, 4, %o2
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EX_LD(LOAD(lduw, %o1, %g1))
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EX_ST(STORE(stw, %g1, %o1 + %o3))
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bgu,pt %XCC, 1b
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add %o1, 4, %o1
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85: retl
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mov EX_RETVAL(GLOBAL_SPARE), %o0
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.align 32
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90:
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subcc %o2, 1, %o2
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EX_LD(LOAD(ldub, %o1, %g1))
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EX_ST(STORE(stb, %g1, %o1 + %o3))
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bgu,pt %XCC, 90b
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add %o1, 1, %o1
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retl
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mov EX_RETVAL(GLOBAL_SPARE), %o0
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.size FUNC_NAME, .-FUNC_NAME
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