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[S390] s390: move machine flags to lowcore

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Currently the storage of the machine flags is a globally exported unsigned
long long variable. By moving the storage location into the lowcore struct we
allow assembler code to check machine_flags directly even without needing a
register. Addtionally the lowcore and therefore the machine flags too will be
in cache most of the time.

Signed-off-by: Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Christian Ehrhardt
2009-04-14 15:36:16 +02:00
committed by Martin Schwidefsky
parent b21597d026
commit 25097bf153
10 changed files with 56 additions and 36 deletions
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17
arch/s390/include/asm/processor.h
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@ -14,7 +14,10 @@
#define __ASM_S390_PROCESSOR_H
#include <linux/linkage.h>
#include <asm/cpuid.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/setup.h>
#ifdef __KERNEL__
/*
@ -23,20 +26,6 @@
*/
#define current_text_addr() ({ void *pc; asm("basr %0,0" : "=a" (pc)); pc; })
/*
* CPU type and hardware bug flags. Kept separately for each CPU.
* Members of this structure are referenced in head.S, so think twice
* before touching them. [mj]
*/
typedef struct
{
unsigned int version : 8;
unsigned int ident : 24;
unsigned int machine : 16;
unsigned int unused : 16;
} __attribute__ ((packed)) cpuid_t;
static inline void get_cpu_id(cpuid_t *ptr)
{
asm volatile("stidp 0(%1)" : "=m" (*ptr) : "a" (ptr));