[PATCH] s390: default storage key
Provide an easy way to define a non-zero storage key at compile time. This is
useful for debugging purposes.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/asm-s390/page.h b/include/asm-s390/page.h
index 614e2a9..2be287b 100644
--- a/include/asm-s390/page.h
+++ b/include/asm-s390/page.h
@@ -16,6 +16,8 @@
#define PAGE_SHIFT 12
#define PAGE_SIZE (1UL << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
+#define PAGE_DEFAULT_ACC 0
+#define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4)
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
diff --git a/include/asm-s390/processor.h b/include/asm-s390/processor.h
index 88c272c..fb46e90 100644
--- a/include/asm-s390/processor.h
+++ b/include/asm-s390/processor.h
@@ -245,7 +245,7 @@
psw_t wait_psw;
wait_psw.mask = PSW_BASE_BITS | PSW_MASK_IO | PSW_MASK_EXT |
- PSW_MASK_MCHECK | PSW_MASK_WAIT;
+ PSW_MASK_MCHECK | PSW_MASK_WAIT | PSW_DEFAULT_KEY;
#ifndef __s390x__
asm volatile (
" basr %0,0\n"
diff --git a/include/asm-s390/ptrace.h b/include/asm-s390/ptrace.h
index 1dc8066..4eff8f2 100644
--- a/include/asm-s390/ptrace.h
+++ b/include/asm-s390/ptrace.h
@@ -185,6 +185,7 @@
#include <linux/stddef.h>
#include <linux/types.h>
#include <asm/setup.h>
+#include <asm/page.h>
typedef union
{
@@ -235,6 +236,7 @@
#define PSW_ADDR_INSN 0x7FFFFFFFUL
#define PSW_BASE_BITS 0x00080000UL
+#define PSW_DEFAULT_KEY (((unsigned long) PAGE_DEFAULT_ACC) << 20)
#define PSW_ASC_PRIMARY 0x00000000UL
#define PSW_ASC_ACCREG 0x00004000UL
@@ -260,6 +262,7 @@
#define PSW_BASE_BITS 0x0000000180000000UL
#define PSW_BASE32_BITS 0x0000000080000000UL
+#define PSW_DEFAULT_KEY (((unsigned long) PAGE_DEFAULT_ACC) << 52)
#define PSW_ASC_PRIMARY 0x0000000000000000UL
#define PSW_ASC_ACCREG 0x0000400000000000UL
@@ -268,14 +271,15 @@
#define PSW_USER32_BITS (PSW_BASE32_BITS | PSW_MASK_DAT | PSW_ASC_HOME | \
PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | \
- PSW_MASK_PSTATE)
+ PSW_MASK_PSTATE | PSW_DEFAULT_KEY)
#endif /* __s390x__ */
-#define PSW_KERNEL_BITS (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY)
+#define PSW_KERNEL_BITS (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY | \
+ PSW_DEFAULT_KEY)
#define PSW_USER_BITS (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME | \
PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | \
- PSW_MASK_PSTATE)
+ PSW_MASK_PSTATE | PSW_DEFAULT_KEY)
/* This macro merges a NEW PSW mask specified by the user into
the currently active PSW mask CURRENT, modifying only those
@@ -470,6 +474,12 @@
extern void show_regs(struct pt_regs * regs);
#endif
+static inline void
+psw_set_key(unsigned int key)
+{
+ asm volatile ( "spka 0(%0)" : : "d" (key) );
+}
+
#endif /* __ASSEMBLY__ */
#endif /* _S390_PTRACE_H */