Revision 54866f032307063776b4eff7eadb131d47f9f9b4 authored by Linus Torvalds on 01 November 2007, 19:09:33 UTC, committed by Linus Torvalds on 01 November 2007, 19:09:33 UTC
* 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6: [IRDA] IRNET: Fix build when TCGETS2 is defined. [NET]: docbook fixes for netif_ functions [NET]: Hide the net_ns kmem cache [NET]: Mark the setup_net as __net_init [NET]: Hide the dead code in the net_namespace.c [NET]: Relax the reference counting of init_net_ns [NETNS]: Make the init/exit hooks checks outside the loop [NET]: Forget the zero_it argument of sk_alloc() [NET]: Remove bogus zero_it argument from sk_alloc [NET]: Make the sk_clone() lighter [NET]: Move some core sock setup into sk_prot_alloc [NET]: Auto-zero the allocated sock object [NET]: Cleanup the allocation/freeing of the sock object [NET]: Move the get_net() from sock_copy() [NET]: Move the sock_copy() from the header [TCP]: Another TAGBITS -> SACKED_ACKED|LOST conversion [TCP]: Process DSACKs that reside within a SACK block
hazards.h
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2003, 04, 07 Ralf Baechle <ralf@linux-mips.org>
* Copyright (C) MIPS Technologies, Inc.
* written by Ralf Baechle <ralf@linux-mips.org>
*/
#ifndef _ASM_HAZARDS_H
#define _ASM_HAZARDS_H
#ifdef __ASSEMBLY__
#define ASMMACRO(name, code...) .macro name; code; .endm
#else
#include <asm/cpu-features.h>
#define ASMMACRO(name, code...) \
__asm__(".macro " #name "; " #code "; .endm"); \
\
static inline void name(void) \
{ \
__asm__ __volatile__ (#name); \
}
/*
* MIPS R2 instruction hazard barrier. Needs to be called as a subroutine.
*/
extern void mips_ihb(void);
#endif
ASMMACRO(_ssnop,
sll $0, $0, 1
)
ASMMACRO(_ehb,
sll $0, $0, 3
)
/*
* TLB hazards
*/
#if defined(CONFIG_CPU_MIPSR2)
/*
* MIPSR2 defines ehb for hazard avoidance
*/
ASMMACRO(mtc0_tlbw_hazard,
_ehb
)
ASMMACRO(tlbw_use_hazard,
_ehb
)
ASMMACRO(tlb_probe_hazard,
_ehb
)
ASMMACRO(irq_enable_hazard,
_ehb
)
ASMMACRO(irq_disable_hazard,
_ehb
)
ASMMACRO(back_to_back_c0_hazard,
_ehb
)
/*
* gcc has a tradition of misscompiling the previous construct using the
* address of a label as argument to inline assembler. Gas otoh has the
* annoying difference between la and dla which are only usable for 32-bit
* rsp. 64-bit code, so can't be used without conditional compilation.
* The alterantive is switching the assembler to 64-bit code which happens
* to work right even for 32-bit code ...
*/
#define instruction_hazard() \
do { \
unsigned long tmp; \
\
__asm__ __volatile__( \
" .set mips64r2 \n" \
" dla %0, 1f \n" \
" jr.hb %0 \n" \
" .set mips0 \n" \
"1: \n" \
: "=r" (tmp)); \
} while (0)
#elif defined(CONFIG_CPU_MIPSR1)
/*
* These are slightly complicated by the fact that we guarantee R1 kernels to
* run fine on R2 processors.
*/
ASMMACRO(mtc0_tlbw_hazard,
_ssnop; _ssnop; _ehb
)
ASMMACRO(tlbw_use_hazard,
_ssnop; _ssnop; _ssnop; _ehb
)
ASMMACRO(tlb_probe_hazard,
_ssnop; _ssnop; _ssnop; _ehb
)
ASMMACRO(irq_enable_hazard,
_ssnop; _ssnop; _ssnop; _ehb
)
ASMMACRO(irq_disable_hazard,
_ssnop; _ssnop; _ssnop; _ehb
)
ASMMACRO(back_to_back_c0_hazard,
_ssnop; _ssnop; _ssnop; _ehb
)
/*
* gcc has a tradition of misscompiling the previous construct using the
* address of a label as argument to inline assembler. Gas otoh has the
* annoying difference between la and dla which are only usable for 32-bit
* rsp. 64-bit code, so can't be used without conditional compilation.
* The alterantive is switching the assembler to 64-bit code which happens
* to work right even for 32-bit code ...
*/
#define __instruction_hazard() \
do { \
unsigned long tmp; \
\
__asm__ __volatile__( \
" .set mips64r2 \n" \
" dla %0, 1f \n" \
" jr.hb %0 \n" \
" .set mips0 \n" \
"1: \n" \
: "=r" (tmp)); \
} while (0)
#define instruction_hazard() \
do { \
if (cpu_has_mips_r2) \
__instruction_hazard(); \
} while (0)
#elif defined(CONFIG_CPU_R10000)
/*
* R10000 rocks - all hazards handled in hardware, so this becomes a nobrainer.
*/
ASMMACRO(mtc0_tlbw_hazard,
)
ASMMACRO(tlbw_use_hazard,
)
ASMMACRO(tlb_probe_hazard,
)
ASMMACRO(irq_enable_hazard,
)
ASMMACRO(irq_disable_hazard,
)
ASMMACRO(back_to_back_c0_hazard,
)
#define instruction_hazard() do { } while (0)
#elif defined(CONFIG_CPU_RM9000)
/*
* RM9000 hazards. When the JTLB is updated by tlbwi or tlbwr, a subsequent
* use of the JTLB for instructions should not occur for 4 cpu cycles and use
* for data translations should not occur for 3 cpu cycles.
*/
ASMMACRO(mtc0_tlbw_hazard,
_ssnop; _ssnop; _ssnop; _ssnop
)
ASMMACRO(tlbw_use_hazard,
_ssnop; _ssnop; _ssnop; _ssnop
)
ASMMACRO(tlb_probe_hazard,
_ssnop; _ssnop; _ssnop; _ssnop
)
ASMMACRO(irq_enable_hazard,
)
ASMMACRO(irq_disable_hazard,
)
ASMMACRO(back_to_back_c0_hazard,
)
#define instruction_hazard() do { } while (0)
#elif defined(CONFIG_CPU_SB1)
/*
* Mostly like R4000 for historic reasons
*/
ASMMACRO(mtc0_tlbw_hazard,
)
ASMMACRO(tlbw_use_hazard,
)
ASMMACRO(tlb_probe_hazard,
)
ASMMACRO(irq_enable_hazard,
)
ASMMACRO(irq_disable_hazard,
_ssnop; _ssnop; _ssnop
)
ASMMACRO(back_to_back_c0_hazard,
)
#define instruction_hazard() do { } while (0)
#else
/*
* Finally the catchall case for all other processors including R4000, R4400,
* R4600, R4700, R5000, RM7000, NEC VR41xx etc.
*
* The taken branch will result in a two cycle penalty for the two killed
* instructions on R4000 / R4400. Other processors only have a single cycle
* hazard so this is nice trick to have an optimal code for a range of
* processors.
*/
ASMMACRO(mtc0_tlbw_hazard,
nop; nop
)
ASMMACRO(tlbw_use_hazard,
nop; nop; nop
)
ASMMACRO(tlb_probe_hazard,
nop; nop; nop
)
ASMMACRO(irq_enable_hazard,
_ssnop; _ssnop; _ssnop;
)
ASMMACRO(irq_disable_hazard,
nop; nop; nop
)
ASMMACRO(back_to_back_c0_hazard,
_ssnop; _ssnop; _ssnop;
)
#define instruction_hazard() do { } while (0)
#endif
/* FPU hazards */
#if defined(CONFIG_CPU_SB1)
ASMMACRO(enable_fpu_hazard,
.set push;
.set mips64;
.set noreorder;
_ssnop;
bnezl $0, .+4;
_ssnop;
.set pop
)
ASMMACRO(disable_fpu_hazard,
)
#elif defined(CONFIG_CPU_MIPSR2)
ASMMACRO(enable_fpu_hazard,
_ehb
)
ASMMACRO(disable_fpu_hazard,
_ehb
)
#else
ASMMACRO(enable_fpu_hazard,
nop; nop; nop; nop
)
ASMMACRO(disable_fpu_hazard,
_ehb
)
#endif
#endif /* _ASM_HAZARDS_H */
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