d8e998c58a
Glibc is about to get some new high precision timer stuff that relies on the standard timebase of the PPC architecture. However, some (rare & old) CPUs do not have such timebase and it is a bit annoying to have your stuff just crash because you are running on the wrong CPU... This exposes to userland a CPU feature bit that tells that the current processor doesn't have a standard timebase. It's negative logic so that glibc will still "just work" on older kernels (it will just be unhappy on those old CPUs but that doesn't really matter as distro tend to update glibc & kernel at the same time). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
/*
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* include/asm-ppc/cputable.h
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*
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* Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef __ASM_PPC_CPUTABLE_H
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#define __ASM_PPC_CPUTABLE_H
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/* Exposed to userland CPU features */
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#define PPC_FEATURE_32 0x80000000
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#define PPC_FEATURE_64 0x40000000
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#define PPC_FEATURE_601_INSTR 0x20000000
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#define PPC_FEATURE_HAS_ALTIVEC 0x10000000
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#define PPC_FEATURE_HAS_FPU 0x08000000
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#define PPC_FEATURE_HAS_MMU 0x04000000
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#define PPC_FEATURE_HAS_4xxMAC 0x02000000
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#define PPC_FEATURE_UNIFIED_CACHE 0x01000000
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#define PPC_FEATURE_HAS_SPE 0x00800000
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#define PPC_FEATURE_HAS_EFP_SINGLE 0x00400000
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#define PPC_FEATURE_HAS_EFP_DOUBLE 0x00200000
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#define PPC_FEATURE_NO_TB 0x00100000
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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/* This structure can grow, it's real size is used by head.S code
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* via the mkdefs mecanism.
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*/
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struct cpu_spec;
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typedef void (*cpu_setup_t)(unsigned long offset, int cpu_nr, struct cpu_spec* spec);
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struct cpu_spec {
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/* CPU is matched via (PVR & pvr_mask) == pvr_value */
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unsigned int pvr_mask;
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unsigned int pvr_value;
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char *cpu_name;
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unsigned int cpu_features; /* Kernel features */
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unsigned int cpu_user_features; /* Userland features */
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/* cache line sizes */
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unsigned int icache_bsize;
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unsigned int dcache_bsize;
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/* number of performance monitor counters */
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unsigned int num_pmcs;
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/* this is called to initialize various CPU bits like L1 cache,
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* BHT, SPD, etc... from head.S before branching to identify_machine
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*/
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cpu_setup_t cpu_setup;
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};
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extern struct cpu_spec cpu_specs[];
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extern struct cpu_spec *cur_cpu_spec[];
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static inline unsigned int cpu_has_feature(unsigned int feature)
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{
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return cur_cpu_spec[0]->cpu_features & feature;
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}
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#endif /* __ASSEMBLY__ */
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/* CPU kernel features */
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#define CPU_FTR_SPLIT_ID_CACHE 0x00000001
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#define CPU_FTR_L2CR 0x00000002
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#define CPU_FTR_SPEC7450 0x00000004
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#define CPU_FTR_ALTIVEC 0x00000008
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#define CPU_FTR_TAU 0x00000010
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#define CPU_FTR_CAN_DOZE 0x00000020
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#define CPU_FTR_USE_TB 0x00000040
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#define CPU_FTR_604_PERF_MON 0x00000080
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#define CPU_FTR_601 0x00000100
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#define CPU_FTR_HPTE_TABLE 0x00000200
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#define CPU_FTR_CAN_NAP 0x00000400
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#define CPU_FTR_L3CR 0x00000800
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#define CPU_FTR_L3_DISABLE_NAP 0x00001000
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#define CPU_FTR_NAP_DISABLE_L2_PR 0x00002000
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#define CPU_FTR_DUAL_PLL_750FX 0x00004000
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#define CPU_FTR_NO_DPM 0x00008000
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#define CPU_FTR_HAS_HIGH_BATS 0x00010000
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#define CPU_FTR_NEED_COHERENT 0x00020000
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#define CPU_FTR_NO_BTIC 0x00040000
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#define CPU_FTR_BIG_PHYS 0x00080000
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#ifdef __ASSEMBLY__
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#define BEGIN_FTR_SECTION 98:
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#define END_FTR_SECTION(msk, val) \
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99: \
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.section __ftr_fixup,"a"; \
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.align 2; \
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.long msk; \
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.long val; \
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.long 98b; \
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.long 99b; \
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.previous
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#else
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#define BEGIN_FTR_SECTION "98:\n"
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#define END_FTR_SECTION(msk, val) \
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"99:\n" \
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" .section __ftr_fixup,\"a\";\n" \
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" .align 2;\n" \
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" .long "#msk";\n" \
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" .long "#val";\n" \
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" .long 98b;\n" \
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" .long 99b;\n" \
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" .previous\n"
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#endif /* __ASSEMBLY__ */
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#define END_FTR_SECTION_IFSET(msk) END_FTR_SECTION((msk), (msk))
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#define END_FTR_SECTION_IFCLR(msk) END_FTR_SECTION((msk), 0)
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#endif /* __ASM_PPC_CPUTABLE_H */
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#endif /* __KERNEL__ */
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