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SubjectRe: Setup code crashes my old 486 box
On Tue, Aug 12, 2008 at 03:57:31PM -0700, H. Peter Anvin wrote:
> Right in concept, but I dislike the implementation (duplication of the
> CPU detect code we already have). Could you try this patch and see if
> it works for you?

Cool, with a small modification to fix a build error with it the
resulting kernel boots my machine. Thanks.
Would be cool to have this patch one merged soon :-)
Attached is your patch with my little build fix. It redefines a values
already defines in cpufeatures.h but I can't include that file in the
boot code so I simply redeclared it. Maybe there is a cleaner solution
for this.

Joerg

diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h
index a34b998..9d4b4b4 100644
--- a/arch/x86/boot/boot.h
+++ b/arch/x86/boot/boot.h
@@ -25,6 +25,8 @@
#include <asm/boot.h>
#include <asm/setup.h>

+#define NCAPINTS 8
+
/* Useful macros */
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))

@@ -242,6 +244,12 @@ int cmdline_find_option(const char *option, char *buffer, int bufsize);
int cmdline_find_option_bool(const char *option);

/* cpu.c, cpucheck.c */
+struct cpu_features {
+ int level; /* Family, or 64 for x86-64 */
+ int model;
+ u32 flags[NCAPINTS];
+};
+extern struct cpu_features cpu;
int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);
int validate_cpu(void);

diff --git a/arch/x86/boot/cpucheck.c b/arch/x86/boot/cpucheck.c
index 7804389..c1ce030 100644
--- a/arch/x86/boot/cpucheck.c
+++ b/arch/x86/boot/cpucheck.c
@@ -30,13 +30,7 @@
#include <asm/required-features.h>
#include <asm/msr-index.h>

-struct cpu_features {
- int level; /* Family, or 64 for x86-64 */
- int model;
- u32 flags[NCAPINTS];
-};
-
-static struct cpu_features cpu;
+struct cpu_features cpu;
static u32 cpu_vendor[3];
static u32 err_flags[NCAPINTS];

diff --git a/arch/x86/boot/main.c b/arch/x86/boot/main.c
index 2296164..01aa64b 100644
--- a/arch/x86/boot/main.c
+++ b/arch/x86/boot/main.c
@@ -73,6 +73,10 @@ static void keyboard_set_repeat(void)
*/
static void query_ist(void)
{
+ /* Some 486 BIOSes apparently crash on this call */
+ if (cpu.level < 6)
+ return;
+
asm("int $0x15"
: "=a" (boot_params.ist_info.signature),
"=b" (boot_params.ist_info.command),
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