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@@ -1,198 +1,12 @@
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-/*
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- * include/asm-i386/bugs.h
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- *
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- * Copyright (C) 1994 Linus Torvalds
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- *
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- * Cyrix stuff, June 1998 by:
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- * - Rafael R. Reilova (moved everything from head.S),
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- * <rreilova@ececs.uc.edu>
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- * - Channing Corn (tests & fixes),
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- * - Andrew D. Balsa (code cleanup).
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- */
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-
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/*
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* This is included by init/main.c to check for architecture-dependent bugs.
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*
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* Needs:
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* void check_bugs(void);
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*/
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+#ifndef _ASM_I386_BUG_H
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+#define _ASM_I386_BUG_H
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-#include <linux/init.h>
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-#include <asm/processor.h>
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-#include <asm/i387.h>
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-#include <asm/msr.h>
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-#include <asm/paravirt.h>
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-
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-static int __init no_halt(char *s)
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-{
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- boot_cpu_data.hlt_works_ok = 0;
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- return 1;
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-}
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-
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-__setup("no-hlt", no_halt);
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-
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-static int __init mca_pentium(char *s)
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-{
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- mca_pentium_flag = 1;
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- return 1;
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-}
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-
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-__setup("mca-pentium", mca_pentium);
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-
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-static int __init no_387(char *s)
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-{
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- boot_cpu_data.hard_math = 0;
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- write_cr0(0xE | read_cr0());
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- return 1;
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-}
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-
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-__setup("no387", no_387);
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-
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-static double __initdata x = 4195835.0;
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-static double __initdata y = 3145727.0;
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-
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-/*
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- * This used to check for exceptions..
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- * However, it turns out that to support that,
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- * the XMM trap handlers basically had to
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- * be buggy. So let's have a correct XMM trap
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- * handler, and forget about printing out
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- * some status at boot.
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- *
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- * We should really only care about bugs here
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- * anyway. Not features.
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- */
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-static void __init check_fpu(void)
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-{
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- if (!boot_cpu_data.hard_math) {
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-#ifndef CONFIG_MATH_EMULATION
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- printk(KERN_EMERG "No coprocessor found and no math emulation present.\n");
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- printk(KERN_EMERG "Giving up.\n");
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- for (;;) ;
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-#endif
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- return;
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- }
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-
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-/* trap_init() enabled FXSR and company _before_ testing for FP problems here. */
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- /* Test for the divl bug.. */
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- __asm__("fninit\n\t"
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- "fldl %1\n\t"
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- "fdivl %2\n\t"
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- "fmull %2\n\t"
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- "fldl %1\n\t"
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- "fsubp %%st,%%st(1)\n\t"
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- "fistpl %0\n\t"
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- "fwait\n\t"
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- "fninit"
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- : "=m" (*&boot_cpu_data.fdiv_bug)
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- : "m" (*&x), "m" (*&y));
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- if (boot_cpu_data.fdiv_bug)
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- printk("Hmm, FPU with FDIV bug.\n");
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-}
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-
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-static void __init check_hlt(void)
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-{
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- if (paravirt_enabled())
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- return;
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-
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- printk(KERN_INFO "Checking 'hlt' instruction... ");
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- if (!boot_cpu_data.hlt_works_ok) {
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- printk("disabled\n");
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- return;
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- }
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- halt();
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- halt();
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- halt();
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- halt();
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- printk("OK.\n");
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-}
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-
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-/*
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- * Most 386 processors have a bug where a POPAD can lock the
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- * machine even from user space.
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- */
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-
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-static void __init check_popad(void)
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-{
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-#ifndef CONFIG_X86_POPAD_OK
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- int res, inp = (int) &res;
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-
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- printk(KERN_INFO "Checking for popad bug... ");
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- __asm__ __volatile__(
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- "movl $12345678,%%eax; movl $0,%%edi; pusha; popa; movl (%%edx,%%edi),%%ecx "
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- : "=&a" (res)
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- : "d" (inp)
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- : "ecx", "edi" );
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- /* If this fails, it means that any user program may lock the CPU hard. Too bad. */
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- if (res != 12345678) printk( "Buggy.\n" );
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- else printk( "OK.\n" );
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-#endif
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-}
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-
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-/*
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- * Check whether we are able to run this kernel safely on SMP.
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- *
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- * - In order to run on a i386, we need to be compiled for i386
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- * (for due to lack of "invlpg" and working WP on a i386)
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- * - In order to run on anything without a TSC, we need to be
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- * compiled for a i486.
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- * - In order to support the local APIC on a buggy Pentium machine,
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- * we need to be compiled with CONFIG_X86_GOOD_APIC disabled,
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- * which happens implicitly if compiled for a Pentium or lower
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- * (unless an advanced selection of CPU features is used) as an
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- * otherwise config implies a properly working local APIC without
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- * the need to do extra reads from the APIC.
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-*/
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-
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-static void __init check_config(void)
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-{
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-/*
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- * We'd better not be a i386 if we're configured to use some
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- * i486+ only features! (WP works in supervisor mode and the
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- * new "invlpg" and "bswap" instructions)
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- */
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-#if defined(CONFIG_X86_WP_WORKS_OK) || defined(CONFIG_X86_INVLPG) || defined(CONFIG_X86_BSWAP)
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- if (boot_cpu_data.x86 == 3)
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- panic("Kernel requires i486+ for 'invlpg' and other features");
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-#endif
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-
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-/*
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- * If we configured ourselves for a TSC, we'd better have one!
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- */
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-#ifdef CONFIG_X86_TSC
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- if (!cpu_has_tsc && !tsc_disable)
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- panic("Kernel compiled for Pentium+, requires TSC feature!");
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-#endif
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-
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-/*
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- * If we were told we had a good local APIC, check for buggy Pentia,
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- * i.e. all B steppings and the C2 stepping of P54C when using their
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- * integrated APIC (see 11AP erratum in "Pentium Processor
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- * Specification Update").
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- */
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-#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_GOOD_APIC)
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- if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL
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- && cpu_has_apic
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- && boot_cpu_data.x86 == 5
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- && boot_cpu_data.x86_model == 2
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- && (boot_cpu_data.x86_mask < 6 || boot_cpu_data.x86_mask == 11))
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- panic("Kernel compiled for PMMX+, assumes a local APIC without the read-before-write bug!");
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-#endif
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-}
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-
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-extern void alternative_instructions(void);
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+extern void __init check_bugs(void);
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-static void __init check_bugs(void)
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-{
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- identify_cpu(&boot_cpu_data);
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-#ifndef CONFIG_SMP
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- printk("CPU: ");
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- print_cpu_info(&boot_cpu_data);
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-#endif
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- check_config();
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- check_fpu();
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- check_hlt();
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- check_popad();
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- init_utsname()->machine[1] = '0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86);
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- alternative_instructions();
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-}
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+#endif /* _ASM_I386_BUG_H */
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Jeremy Fitzhardinge