Messages in this thread Patch in this message | | | Date | Wed, 05 Dec 2007 21:08:04 -0500 | From | Mathieu Desnoyers <> | Subject | [patch 6/7] Immediate Values - Powerpc Optimization |
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PowerPC optimization of the immediate values which uses a li instruction, patched with an immediate value.
Changelog: - Put imv_set and _imv_set in the architecture independent header. - Pack the __imv section. Use smallest types required for size (char). - Remove architecture specific update code : now handled by architecture agnostic code. - Use imv_* instead of immediate_*.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> CC: Rusty Russell <rusty@rustcorp.com.au> CC: Christoph Hellwig <hch@infradead.org> CC: Paul Mackerras <paulus@samba.org> --- arch/powerpc/Kconfig | 1 include/asm-powerpc/immediate.h | 55 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 56 insertions(+)
Index: linux-2.6-lttng/include/asm-powerpc/immediate.h =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6-lttng/include/asm-powerpc/immediate.h 2007-11-19 12:26:16.000000000 -0500 @@ -0,0 +1,55 @@ +#ifndef _ASM_POWERPC_IMMEDIATE_H +#define _ASM_POWERPC_IMMEDIATE_H + +/* + * Immediate values. PowerPC architecture optimizations. + * + * (C) Copyright 2006 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> + * + * This file is released under the GPLv2. + * See the file COPYING for more details. + */ + +#include <asm/asm-compat.h> + +/** + * imv_read - read immediate variable + * @name: immediate value name + * + * Reads the value of @name. + * Optimized version of the immediate. + * Do not use in __init and __exit functions. Use _imv_read() instead. + */ +#define imv_read(name) \ + ({ \ + __typeof__(name##__imv) value; \ + BUILD_BUG_ON(sizeof(value) > 8); \ + switch (sizeof(value)) { \ + case 1: \ + asm(".section __imv,\"a\",@progbits\n\t" \ + PPC_LONG "%c1, ((1f)-1)\n\t" \ + ".byte 1\n\t" \ + ".previous\n\t" \ + "li %0,0\n\t" \ + "1:\n\t" \ + : "=r" (value) \ + : "i" (&name##__imv)); \ + break; \ + case 2: \ + asm(".section __imv,\"a\",@progbits\n\t" \ + PPC_LONG "%c1, ((1f)-2)\n\t" \ + ".byte 2\n\t" \ + ".previous\n\t" \ + "li %0,0\n\t" \ + "1:\n\t" \ + : "=r" (value) \ + : "i" (&name##__imv)); \ + break; \ + case 4: \ + case 8: value = name##__imv; \ + break; \ + }; \ + value; \ + }) + +#endif /* _ASM_POWERPC_IMMEDIATE_H */ Index: linux-2.6-lttng/arch/powerpc/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/powerpc/Kconfig 2007-11-19 12:25:21.000000000 -0500 +++ linux-2.6-lttng/arch/powerpc/Kconfig 2007-11-19 12:26:01.000000000 -0500 @@ -81,6 +81,7 @@ config PPC default y select HAVE_OPROFILE select HAVE_KPROBES + select HAVE_IMMEDIATE config EARLY_PRINTK bool -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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