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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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c99aa3804e
arch/x86/kernel/cpu/nexgen.o:
text data bss dec hex filename
111 316 0 427 1ab nexgen.o.before
111 316 0 427 1ab nexgen.o.after
md5:
e796efefea9ebc6644338bad226599ee nexgen.o.before.asm
e796efefea9ebc6644338bad226599ee nexgen.o.after.asm
Signed-off-by: Paolo Ciarrocchi <paolo.ciarrocchi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <asm/processor.h>
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#include "cpu.h"
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/*
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* Detect a NexGen CPU running without BIOS hypercode new enough
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* to have CPUID. (Thanks to Herbert Oppmann)
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*/
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static int __cpuinit deep_magic_nexgen_probe(void)
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{
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int ret;
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__asm__ __volatile__ (
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" movw $0x5555, %%ax\n"
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" xorw %%dx,%%dx\n"
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" movw $2, %%cx\n"
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" divw %%cx\n"
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" movl $0, %%eax\n"
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" jnz 1f\n"
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" movl $1, %%eax\n"
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"1:\n"
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: "=a" (ret) : : "cx", "dx");
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return ret;
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}
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static void __cpuinit init_nexgen(struct cpuinfo_x86 *c)
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{
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c->x86_cache_size = 256; /* A few had 1 MB... */
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}
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static void __cpuinit nexgen_identify(struct cpuinfo_x86 *c)
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{
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/* Detect NexGen with old hypercode */
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if (deep_magic_nexgen_probe())
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strcpy(c->x86_vendor_id, "NexGenDriven");
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}
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static struct cpu_dev nexgen_cpu_dev __cpuinitdata = {
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.c_vendor = "Nexgen",
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.c_ident = { "NexGenDriven" },
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.c_models = {
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{ .vendor = X86_VENDOR_NEXGEN,
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.family = 5,
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.model_names = { [1] = "Nx586" }
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},
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},
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.c_init = init_nexgen,
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.c_identify = nexgen_identify,
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};
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int __init nexgen_init_cpu(void)
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{
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cpu_devs[X86_VENDOR_NEXGEN] = &nexgen_cpu_dev;
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return 0;
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}
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