x86-32: Unbreak booting on some 486 clones

There appear to have been some 486 clones, including the "enhanced"
version of Am486, which have CPUID but not CR4.  These 486 clones had
only the FPU flag, if any, unlike the Intel 486s with CPUID, which
also had VME and therefore needed CR4.

Therefore, look at the basic CPUID flags and require at least one bit
other than bit 0 before we modify CR4.

Thanks to Christian Ludloff of sandpile.org for confirming this as a
problem.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 957a47a..4dac2f6 100644 (file)
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -292,8 +292,8 @@ default_entry:
  *     be using the global pages. 
  *
  *     NOTE! If we are on a 486 we may have no cr4 at all!
- *     Specifically, cr4 exists if and only if CPUID exists,
- *     which in turn exists if and only if EFLAGS.ID exists.
+ *     Specifically, cr4 exists if and only if CPUID exists
+ *     and has flags other than the FPU flag set.
  */
        movl $X86_EFLAGS_ID,%ecx
        pushl %ecx
@@ -308,6 +308,11 @@ default_entry:
        testl %ecx,%eax
        jz 6f                   # No ID flag = no CPUID = no CR4
 
+       movl $1,%eax
+       cpuid
+       andl $~1,%edx           # Ignore CPUID.FPU
+       jz 6f                   # No flags or only CPUID.FPU = no CR4
+
        movl pa(mmu_cr4_features),%eax
        movl %eax,%cr4