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MIPS: Loongson: Add oprofile support

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This kernel support is needed by the user-space tool:oprofile to profile
linux kernel or applications via loongson2 performance counters. you can
enable this driver via CONFIG_OPROFILE = y or m.

On Loongson2 there are two performance counters, each one can count 16
events respectively. when anyone of the performance counter overflows, an
interrupt will be generated and is routed to the IRQ MIPS_CPU_IRQ_BASE + 6.

Signed-off-by: Yanhua <yanh@lemote.com>
Signed-off-by: Wu Zhangjin <wuzj@lemote.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Wu Zhangjin
2009-07-02 23:25:46 +08:00
committed by Ralf Baechle
parent 92d1b63dba
commit 67b35e5d01
5 changed files with 187 additions and 0 deletions
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arch/mips/include/asm/mach-lemote/loongson.h
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@@ -50,4 +50,7 @@ extern void __init prom_init_env(void);
#define LOONGSON_PXARB_CFG BONITO(BONITO_REGBASE + 0x68)
#define LOONGSON_PXARB_STATUS BONITO(BONITO_REGBASE + 0x6c)
/* loongson2-specific perf counter IRQ */
#define LOONGSON2_PERFCNT_IRQ (MIPS_CPU_IRQ_BASE + 6)
#endif /* __ASM_MACH_LOONGSON_LOONGSON_H */