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78bdbbac08
MIPS provides multiple definitions for the following functions: fw_init_cmdline __delay __udelay __ndelay memmove __rmemcpy memcpy __copy_user The generic ones are defined in lib-y objects, which are overridden by the Octeon ones when CONFIG_CAVIUM_OCTEON_SOC is enabled. The use of EXPORT_SYMBOL in static libraries potentially causes a problem for the llvm linker [1]. So, I want to forcibly link lib-y objects to vmlinux when CONFIG_MODULES=y. As a groundwork, we must fix multiple definitions that have previously been hidden by lib-y. If you look at lib/string.c, arch can define __HAVE_ARCH_* to opt out the generic implementation. Similarly, this commit adds CONFIG_HAVE_PLAT_* to allow a platform to opt out the MIPS generic code. [1]: https://github.com/ClangBuiltLinux/linux/issues/515 Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994 by Waldorf Electronics
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* Copyright (C) 1995 - 2000, 01, 03 by Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Copyright (C) 2007, 2014 Maciej W. Rozycki
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*/
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#include <linux/delay.h>
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#include <linux/export.h>
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#include <linux/param.h>
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#include <linux/smp.h>
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#include <linux/stringify.h>
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#include <asm/asm.h>
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#include <asm/compiler.h>
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#include <asm/war.h>
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#ifndef CONFIG_CPU_DADDI_WORKAROUNDS
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#define GCC_DADDI_IMM_ASM() "I"
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#else
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#define GCC_DADDI_IMM_ASM() "r"
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#endif
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#ifndef CONFIG_HAVE_PLAT_DELAY
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void __delay(unsigned long loops)
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{
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__asm__ __volatile__ (
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" .set noreorder \n"
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" .align 3 \n"
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"1: bnez %0, 1b \n"
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" " __stringify(LONG_SUBU) " %0, %1 \n"
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" .set reorder \n"
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: "=r" (loops)
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: GCC_DADDI_IMM_ASM() (1), "0" (loops));
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}
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EXPORT_SYMBOL(__delay);
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/*
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* Division by multiplication: you don't have to worry about
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* loss of precision.
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*
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* Use only for very small delays ( < 1 msec). Should probably use a
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* lookup table, really, as the multiplications take much too long with
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* short delays. This is a "reasonable" implementation, though (and the
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* first constant multiplications gets optimized away if the delay is
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* a constant)
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*/
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void __udelay(unsigned long us)
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{
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unsigned int lpj = raw_current_cpu_data.udelay_val;
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__delay((us * 0x000010c7ull * HZ * lpj) >> 32);
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}
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EXPORT_SYMBOL(__udelay);
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void __ndelay(unsigned long ns)
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{
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unsigned int lpj = raw_current_cpu_data.udelay_val;
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__delay((ns * 0x00000005ull * HZ * lpj) >> 32);
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}
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EXPORT_SYMBOL(__ndelay);
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#endif
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