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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2010-10-25 16:10:51 +0200
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-10-25 16:10:21 +0200
commit14375bc4eb8dd0fb0e765390650564c35bb31068 (patch)
tree27200620658245c582ee9497fc969a082b304cab /arch/s390/include
parenteca577ef5989d25dedc6b0fae3c4622ceaee8005 (diff)
downloadlinux-linaro-android-14375bc4eb8dd0fb0e765390650564c35bb31068.tar.gz
[S390] cleanup facility list handling
Store the facility list once at system startup with stfl/stfle and reuse the result for all facility tests. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include')
-rw-r--r--arch/s390/include/asm/lowcore.h11
-rw-r--r--arch/s390/include/asm/system.h33
2 files changed, 20 insertions, 24 deletions
diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h
index 0f97ef2d92a..65e172f8209 100644
--- a/arch/s390/include/asm/lowcore.h
+++ b/arch/s390/include/asm/lowcore.h
@@ -150,9 +150,10 @@ struct _lowcore {
*/
__u32 ipib; /* 0x0e00 */
__u32 ipib_checksum; /* 0x0e04 */
+ __u8 pad_0x0e08[0x0f00-0x0e08]; /* 0x0e08 */
- /* Align to the top 1k of prefix area */
- __u8 pad_0x0e08[0x1000-0x0e08]; /* 0x0e08 */
+ /* Extended facility list */
+ __u64 stfle_fac_list[32]; /* 0x0f00 */
} __packed;
#else /* CONFIG_32BIT */
@@ -285,7 +286,11 @@ struct _lowcore {
*/
__u64 ipib; /* 0x0e00 */
__u32 ipib_checksum; /* 0x0e08 */
- __u8 pad_0x0e0c[0x11b8-0x0e0c]; /* 0x0e0c */
+ __u8 pad_0x0e0c[0x0f00-0x0e0c]; /* 0x0e0c */
+
+ /* Extended facility list */
+ __u64 stfle_fac_list[32]; /* 0x0f00 */
+ __u8 pad_0x1000[0x11b8-0x1000]; /* 0x1000 */
/* 64 bit extparam used for pfault/diag 250: defined by architecture */
__u64 ext_params2; /* 0x11B8 */
diff --git a/arch/s390/include/asm/system.h b/arch/s390/include/asm/system.h
index 3c079dd5ee7..3ad16dbf622 100644
--- a/arch/s390/include/asm/system.h
+++ b/arch/s390/include/asm/system.h
@@ -420,30 +420,21 @@ extern void smp_ctl_clear_bit(int cr, int bit);
#endif /* CONFIG_SMP */
-static inline unsigned int stfl(void)
-{
- asm volatile(
- " .insn s,0xb2b10000,0(0)\n" /* stfl */
- "0:\n"
- EX_TABLE(0b,0b));
- return S390_lowcore.stfl_fac_list;
-}
+#define MAX_FACILITY_BIT (256*8) /* stfle_fac_list has 256 bytes */
-static inline int __stfle(unsigned long long *list, int doublewords)
+/*
+ * The test_facility function uses the bit odering where the MSB is bit 0.
+ * That makes it easier to query facility bits with the bit number as
+ * documented in the Principles of Operation.
+ */
+static inline int test_facility(unsigned long nr)
{
- typedef struct { unsigned long long _[doublewords]; } addrtype;
- register unsigned long __nr asm("0") = doublewords - 1;
-
- asm volatile(".insn s,0xb2b00000,%0" /* stfle */
- : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
- return __nr + 1;
-}
+ unsigned char *ptr;
-static inline int stfle(unsigned long long *list, int doublewords)
-{
- if (!(stfl() & (1UL << 24)))
- return -EOPNOTSUPP;
- return __stfle(list, doublewords);
+ if (nr >= MAX_FACILITY_BIT)
+ return 0;
+ ptr = (unsigned char *) &S390_lowcore.stfle_fac_list + (nr >> 3);
+ return (*ptr & (0x80 >> (nr & 7))) != 0;
}
static inline unsigned short stap(void)