diff options
| -rw-r--r-- | arch/i386/Kconfig.cpu | 22 | ||||
| -rw-r--r-- | arch/i386/boot/setup.S | 17 | ||||
| -rw-r--r-- | arch/i386/kernel/verify_cpu.S | 65 | ||||
| -rw-r--r-- | include/asm-i386/cpufeature.h | 3 | ||||
| -rw-r--r-- | include/asm-i386/required-features.h | 34 |
5 files changed, 139 insertions, 2 deletions
diff --git a/arch/i386/Kconfig.cpu b/arch/i386/Kconfig.cpu index b1af9f50a143..dce6124cb842 100644 --- a/arch/i386/Kconfig.cpu +++ b/arch/i386/Kconfig.cpu @@ -240,14 +240,19 @@ config X86_L1_CACHE_SHIFT default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MVIAC7 +config X86_XADD + bool + depends on !M386 + default y + config RWSEM_GENERIC_SPINLOCK bool - depends on M386 + depends on !X86_XADD default y config RWSEM_XCHGADD_ALGORITHM bool - depends on !M386 + depends on X86_XADD default y config ARCH_HAS_ILOG2_U32 @@ -331,3 +336,16 @@ config X86_TSC bool depends on (MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2) && !X86_NUMAQ default y + +# this should be set for all -march=.. options where the compiler +# generates cmov. +config X86_CMOV + bool + depends on (MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7) + default y + +config X86_MINIMUM_CPU_MODEL + int + default "4" if X86_XADD || X86_CMPXCHG || X86_BSWAP + default "0" + diff --git a/arch/i386/boot/setup.S b/arch/i386/boot/setup.S index b74b7f40b79c..f8b3b9cda2b1 100644 --- a/arch/i386/boot/setup.S +++ b/arch/i386/boot/setup.S @@ -302,7 +302,24 @@ good_sig: loader_panic_mess: .string "Wrong loader, giving up..." +# check minimum cpuid +# we do this here because it is the last place we can actually +# show a user visible error message. Later the video modus +# might be already messed up. loader_ok: + call verify_cpu + testl %eax,%eax + jz cpu_ok + lea cpu_panic_mess,%si + call prtstr +1: jmp 1b + +cpu_panic_mess: + .asciz "PANIC: CPU too old for this kernel." + +#include "../kernel/verify_cpu.S" + +cpu_ok: # Get memory size (extended mem, kB) xorl %eax, %eax diff --git a/arch/i386/kernel/verify_cpu.S b/arch/i386/kernel/verify_cpu.S new file mode 100644 index 000000000000..e51a8695d54e --- /dev/null +++ b/arch/i386/kernel/verify_cpu.S @@ -0,0 +1,65 @@ +/* Check if CPU has some minimum CPUID bits + This runs in 16bit mode so that the caller can still use the BIOS + to output errors on the screen */ +#include <asm/cpufeature.h> + +verify_cpu: + pushfl # Save caller passed flags + pushl $0 # Kill any dangerous flags + popfl + +#if CONFIG_X86_MINIMUM_CPU_MODEL >= 4 + pushfl + orl $(1<<18),(%esp) # try setting AC + popfl + pushfl + popl %eax + testl $(1<<18),%eax + jz bad +#endif +#if REQUIRED_MASK1 != 0 + pushfl # standard way to check for cpuid + popl %eax + movl %eax,%ebx + xorl $0x200000,%eax + pushl %eax + popfl + pushfl + popl %eax + cmpl %eax,%ebx + pushfl # standard way to check for cpuid + popl %eax + movl %eax,%ebx + xorl $0x200000,%eax + pushl %eax + popfl + pushfl + popl %eax + cmpl %eax,%ebx + jz bad # REQUIRED_MASK1 != 0 requires CPUID + + movl $0x0,%eax # See if cpuid 1 is implemented + cpuid + cmpl $0x1,%eax + jb bad # no cpuid 1 + + movl $0x1,%eax # Does the cpu have what it takes + cpuid + +#if CONFIG_X86_MINIMUM_CPU_MODEL > 4 +#error add proper model checking here +#endif + + andl $REQUIRED_MASK1,%edx + xorl $REQUIRED_MASK1,%edx + jnz bad +#endif /* REQUIRED_MASK1 */ + + popfl + xor %eax,%eax + ret + +bad: + popfl + movl $1,%eax + ret diff --git a/include/asm-i386/cpufeature.h b/include/asm-i386/cpufeature.h index d1b8e4ab6c1a..e66d004aa651 100644 --- a/include/asm-i386/cpufeature.h +++ b/include/asm-i386/cpufeature.h @@ -7,7 +7,10 @@ #ifndef __ASM_I386_CPUFEATURE_H #define __ASM_I386_CPUFEATURE_H +#ifndef __ASSEMBLY__ #include <linux/bitops.h> +#endif +#include <asm/required-features.h> #define NCAPINTS 7 /* N 32-bit words worth of info */ diff --git a/include/asm-i386/required-features.h b/include/asm-i386/required-features.h new file mode 100644 index 000000000000..9db866c1e64c --- /dev/null +++ b/include/asm-i386/required-features.h @@ -0,0 +1,34 @@ +#ifndef _ASM_REQUIRED_FEATURES_H +#define _ASM_REQUIRED_FEATURES_H 1 + +/* Define minimum CPUID feature set for kernel These bits are checked + really early to actually display a visible error message before the + kernel dies. Only add word 0 bits here + + Some requirements that are not in CPUID yet are also in the + CONFIG_X86_MINIMUM_CPU mode which is checked too. + + The real information is in arch/i386/Kconfig.cpu, this just converts + the CONFIGs into a bitmask */ + +#ifdef CONFIG_X86_PAE +#define NEED_PAE (1<<X86_FEATURE_PAE) +#else +#define NEED_PAE 0 +#endif + +#ifdef CONFIG_X86_CMOV +#define NEED_CMOV (1<<X86_FEATURE_CMOV) +#else +#define NEED_CMOV 0 +#endif + +#ifdef CONFIG_X86_CMPXCHG64 +#define NEED_CMPXCHG64 (1<<X86_FEATURE_CX8) +#else +#define NEED_CMPXCHG64 0 +#endif + +#define REQUIRED_MASK1 (NEED_PAE|NEED_CMOV|NEED_CMPXCHG64) + +#endif |