[patch 4/12] s390: default storage key.

From: Martin Schwidefsky
Date: Fri Apr 22 2005 - 10:17:27 EST

[patch 4/12] s390: default storage key.

From: Peter Oberparleiter <peter.oberparleiter@xxxxxxxxxx>

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@xxxxxxxxxx>

diffstat:
arch/s390/kernel/s390_ksyms.c | 1 -
arch/s390/kernel/setup.c | 20 ++++++++++++++++----
drivers/s390/cio/cio.c | 4 ++--
drivers/s390/cio/device_ops.c | 6 +++---
drivers/s390/cio/qdio.h | 6 ++++--
include/asm-s390/page.h | 2 ++
include/asm-s390/processor.h | 2 +-
include/asm-s390/ptrace.h | 16 +++++++++++++---
8 files changed, 41 insertions(+), 16 deletions(-)

diff -urpN linux-2.6/arch/s390/kernel/s390_ksyms.c linux-2.6-patched/arch/s390/kernel/s390_ksyms.c
--- linux-2.6/arch/s390/kernel/s390_ksyms.c 2005-03-02 08:38:12.000000000 +0100
+++ linux-2.6-patched/arch/s390/kernel/s390_ksyms.c 2005-04-22 15:45:01.000000000 +0200
@@ -34,7 +34,6 @@ EXPORT_SYMBOL(__clear_user_asm);
EXPORT_SYMBOL(__strncpy_from_user_asm);
EXPORT_SYMBOL(__strnlen_user_asm);
EXPORT_SYMBOL(diag10);
-EXPORT_SYMBOL(default_storage_key);

/*
* semaphore ops
diff -urpN linux-2.6/arch/s390/kernel/setup.c linux-2.6-patched/arch/s390/kernel/setup.c
--- linux-2.6/arch/s390/kernel/setup.c 2005-04-22 15:45:01.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/setup.c 2005-04-22 15:45:01.000000000 +0200
@@ -44,6 +44,8 @@
#include <asm/cpcmd.h>
#include <asm/lowcore.h>
#include <asm/irq.h>
+#include <asm/page.h>
+#include <asm/ptrace.h>

/*
* Machine setup..
@@ -53,7 +55,6 @@ unsigned int console_devno = -1;
unsigned int console_irq = -1;
unsigned long memory_size = 0;
unsigned long machine_flags = 0;
-unsigned int default_storage_key = 0;
struct {
unsigned long addr, size, type;
} memory_chunk[MEMORY_CHUNKS] = { { 0 } };
@@ -402,7 +403,7 @@ setup_lowcore(void)
lc = (struct _lowcore *)
__alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
memset(lc, 0, lc_pages * PAGE_SIZE);
- lc->restart_psw.mask = PSW_BASE_BITS;
+ lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
lc->restart_psw.addr =
PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
lc->external_new_psw.mask = PSW_KERNEL_BITS;
@@ -470,7 +471,7 @@ static void __init
setup_memory(void)
{
unsigned long bootmap_size;
- unsigned long start_pfn, end_pfn;
+ unsigned long start_pfn, end_pfn, init_pfn;
unsigned long last_rw_end;
int i;

@@ -481,6 +482,10 @@ setup_memory(void)
start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
end_pfn = max_pfn = memory_end >> PAGE_SHIFT;

+ /* Initialize storage key for kernel pages */
+ for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
+ page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
+
/*
* Initialize the boot-time allocator (with low memory only):
*/
@@ -491,7 +496,7 @@ setup_memory(void)
*/
last_rw_end = start_pfn;

- for (i = 0; i < 16 && memory_chunk[i].size > 0; i++) {
+ for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
unsigned long start_chunk, end_chunk;

if (memory_chunk[i].type != CHUNK_READ_WRITE)
@@ -505,6 +510,11 @@ setup_memory(void)
if (end_chunk > end_pfn)
end_chunk = end_pfn;
if (start_chunk < end_chunk) {
+ /* Initialize storage key for RAM pages */
+ for (init_pfn = start_chunk ; init_pfn < end_chunk;
+ init_pfn++)
+ page_set_storage_key(init_pfn << PAGE_SHIFT,
+ PAGE_DEFAULT_KEY);
free_bootmem(start_chunk << PAGE_SHIFT,
(end_chunk - start_chunk) << PAGE_SHIFT);
if (last_rw_end < start_chunk)
@@ -513,6 +523,8 @@ setup_memory(void)
}
}

+ psw_set_key(PAGE_DEFAULT_KEY);
+
if (last_rw_end < end_pfn - 1)
add_memory_hole(last_rw_end, end_pfn - 1);

diff -urpN linux-2.6/drivers/s390/cio/cio.c linux-2.6-patched/drivers/s390/cio/cio.c
--- linux-2.6/drivers/s390/cio/cio.c 2005-04-22 15:44:48.000000000 +0200
+++ linux-2.6-patched/drivers/s390/cio/cio.c 2005-04-22 15:45:01.000000000 +0200
@@ -1,7 +1,7 @@
/*
* drivers/s390/cio/cio.c
* S/390 common I/O routines -- low level i/o calls
- * $Revision: 1.131 $
+ * $Revision: 1.133 $
*
* Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
* IBM Corporation
@@ -228,7 +228,7 @@ cio_start_key (struct subchannel *sch, /
int
cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm)
{
- return cio_start_key(sch, cpa, lpm, default_storage_key);
+ return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY);
}

/*
diff -urpN linux-2.6/drivers/s390/cio/device_ops.c linux-2.6-patched/drivers/s390/cio/device_ops.c
--- linux-2.6/drivers/s390/cio/device_ops.c 2005-04-22 15:44:48.000000000 +0200
+++ linux-2.6-patched/drivers/s390/cio/device_ops.c 2005-04-22 15:45:01.000000000 +0200
@@ -1,7 +1,7 @@
/*
* drivers/s390/cio/device_ops.c
*
- * $Revision: 1.55 $
+ * $Revision: 1.56 $
*
* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
* IBM Corporation
@@ -128,7 +128,7 @@ ccw_device_start(struct ccw_device *cdev
unsigned long intparm, __u8 lpm, unsigned long flags)
{
return ccw_device_start_key(cdev, cpa, intparm, lpm,
- default_storage_key, flags);
+ PAGE_DEFAULT_KEY, flags);
}

int
@@ -137,7 +137,7 @@ ccw_device_start_timeout(struct ccw_devi
int expires)
{
return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm,
- default_storage_key, flags,
+ PAGE_DEFAULT_KEY, flags,
expires);
}

diff -urpN linux-2.6/drivers/s390/cio/qdio.h linux-2.6-patched/drivers/s390/cio/qdio.h
--- linux-2.6/drivers/s390/cio/qdio.h 2005-03-02 08:37:50.000000000 +0100
+++ linux-2.6-patched/drivers/s390/cio/qdio.h 2005-04-22 15:45:01.000000000 +0200
@@ -1,7 +1,9 @@
#ifndef _CIO_QDIO_H
#define _CIO_QDIO_H

-#define VERSION_CIO_QDIO_H "$Revision: 1.26 $"
+#include <asm/page.h>
+
+#define VERSION_CIO_QDIO_H "$Revision: 1.32 $"

#ifdef CONFIG_QDIO_DEBUG
#define QDIO_VERBOSE_LEVEL 9
@@ -42,7 +44,7 @@

#define QDIO_Q_LAPS 5

-#define QDIO_STORAGE_KEY 0
+#define QDIO_STORAGE_KEY PAGE_DEFAULT_KEY

#define L2_CACHELINE_SIZE 256
#define INDICATORS_PER_CACHELINE (L2_CACHELINE_SIZE/sizeof(__u32))
diff -urpN linux-2.6/include/asm-s390/page.h linux-2.6-patched/include/asm-s390/page.h
--- linux-2.6/include/asm-s390/page.h 2005-03-02 08:37:49.000000000 +0100
+++ linux-2.6-patched/include/asm-s390/page.h 2005-04-22 15:45:01.000000000 +0200
@@ -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 -urpN linux-2.6/include/asm-s390/processor.h linux-2.6-patched/include/asm-s390/processor.h
--- linux-2.6/include/asm-s390/processor.h 2005-04-22 15:44:53.000000000 +0200
+++ linux-2.6-patched/include/asm-s390/processor.h 2005-04-22 15:45:01.000000000 +0200
@@ -245,7 +245,7 @@ static inline void enabled_wait(void)
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 -urpN linux-2.6/include/asm-s390/ptrace.h linux-2.6-patched/include/asm-s390/ptrace.h
--- linux-2.6/include/asm-s390/ptrace.h 2005-03-02 08:38:13.000000000 +0100
+++ linux-2.6-patched/include/asm-s390/ptrace.h 2005-04-22 15:45:01.000000000 +0200
@@ -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 @@ typedef struct
#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 @@ typedef struct

#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 @@ typedef struct

#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 @@ struct user_regs_struct
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 */
-
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