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148f9bb877
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings. In any case, they are temporary and harmless.
This removes all the arch/x86 uses of the __cpuinit macros from
all C files. x86 only had the one __CPUINIT used in assembly files,
and it wasn't paired off with a .previous or a __FINIT, so we can
delete it directly w/o any corresponding additional change there.
[1] https://lkml.org/lkml/2013/5/20/589
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Acked-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
142 lines
3.0 KiB
C
142 lines
3.0 KiB
C
/*
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* X86 CPU microcode early update for Linux
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*
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* Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
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* H Peter Anvin" <hpa@zytor.com>
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*
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* This driver allows to early upgrade microcode on Intel processors
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* belonging to IA-32 family - PentiumPro, Pentium II,
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* Pentium III, Xeon, Pentium 4, etc.
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*
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* Reference: Section 9.11 of Volume 3, IA-32 Intel Architecture
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* Software Developer's Manual.
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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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#include <linux/module.h>
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#include <asm/microcode_intel.h>
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#include <asm/microcode_amd.h>
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#include <asm/processor.h>
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#define QCHAR(a, b, c, d) ((a) + ((b) << 8) + ((c) << 16) + ((d) << 24))
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#define CPUID_INTEL1 QCHAR('G', 'e', 'n', 'u')
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#define CPUID_INTEL2 QCHAR('i', 'n', 'e', 'I')
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#define CPUID_INTEL3 QCHAR('n', 't', 'e', 'l')
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#define CPUID_AMD1 QCHAR('A', 'u', 't', 'h')
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#define CPUID_AMD2 QCHAR('e', 'n', 't', 'i')
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#define CPUID_AMD3 QCHAR('c', 'A', 'M', 'D')
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#define CPUID_IS(a, b, c, ebx, ecx, edx) \
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(!((ebx ^ (a))|(edx ^ (b))|(ecx ^ (c))))
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/*
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* In early loading microcode phase on BSP, boot_cpu_data is not set up yet.
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* x86_vendor() gets vendor id for BSP.
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*
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* In 32 bit AP case, accessing boot_cpu_data needs linear address. To simplify
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* coding, we still use x86_vendor() to get vendor id for AP.
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*
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* x86_vendor() gets vendor information directly through cpuid.
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*/
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static int x86_vendor(void)
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{
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u32 eax = 0x00000000;
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u32 ebx, ecx = 0, edx;
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native_cpuid(&eax, &ebx, &ecx, &edx);
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if (CPUID_IS(CPUID_INTEL1, CPUID_INTEL2, CPUID_INTEL3, ebx, ecx, edx))
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return X86_VENDOR_INTEL;
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if (CPUID_IS(CPUID_AMD1, CPUID_AMD2, CPUID_AMD3, ebx, ecx, edx))
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return X86_VENDOR_AMD;
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return X86_VENDOR_UNKNOWN;
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}
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static int x86_family(void)
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{
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u32 eax = 0x00000001;
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u32 ebx, ecx = 0, edx;
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int x86;
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native_cpuid(&eax, &ebx, &ecx, &edx);
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x86 = (eax >> 8) & 0xf;
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if (x86 == 15)
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x86 += (eax >> 20) & 0xff;
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return x86;
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}
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void __init load_ucode_bsp(void)
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{
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int vendor, x86;
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if (!have_cpuid_p())
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return;
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vendor = x86_vendor();
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x86 = x86_family();
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switch (vendor) {
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case X86_VENDOR_INTEL:
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if (x86 >= 6)
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load_ucode_intel_bsp();
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break;
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case X86_VENDOR_AMD:
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if (x86 >= 0x10)
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load_ucode_amd_bsp();
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break;
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default:
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break;
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}
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}
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void load_ucode_ap(void)
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{
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int vendor, x86;
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if (!have_cpuid_p())
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return;
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vendor = x86_vendor();
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x86 = x86_family();
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switch (vendor) {
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case X86_VENDOR_INTEL:
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if (x86 >= 6)
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load_ucode_intel_ap();
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break;
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case X86_VENDOR_AMD:
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if (x86 >= 0x10)
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load_ucode_amd_ap();
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break;
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default:
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break;
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}
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}
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int __init save_microcode_in_initrd(void)
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{
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struct cpuinfo_x86 *c = &boot_cpu_data;
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switch (c->x86_vendor) {
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case X86_VENDOR_INTEL:
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if (c->x86 >= 6)
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save_microcode_in_initrd_intel();
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break;
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case X86_VENDOR_AMD:
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if (c->x86 >= 0x10)
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save_microcode_in_initrd_amd();
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break;
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default:
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break;
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}
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return 0;
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}
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