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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2007-05-04 18:48:28 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-05-04 18:48:35 +0200
commitcf8ba7a95511b86608acb481ad96219fe2da4b3a (patch)
treef2a4fcba2c7ad7f29500eaaadc4a8488d8855cdd /arch
parente29630627702571eb2b2a0955605b7f8971c82c1 (diff)
downloadlinux-2.6.34-ux500-cf8ba7a95511b86608acb481ad96219fe2da4b3a.tar.gz
[S390] add hardware capability support (ELF_HWCAP).
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/s390/kernel/setup.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 82b7fe32d86..6bfb0889eb1 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -74,6 +74,8 @@ unsigned int console_mode = 0;
unsigned int console_devno = -1;
unsigned int console_irq = -1;
unsigned long machine_flags = 0;
+unsigned long elf_hwcap = 0;
+char elf_platform[ELF_PLATFORM_SIZE];
struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
@@ -749,6 +751,98 @@ setup_memory(void)
#endif
}
+static __init 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;
+}
+
+static __init int stfle(unsigned long long *list, int doublewords)
+{
+ 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;
+}
+
+/*
+ * Setup hardware capabilities.
+ */
+static void __init setup_hwcaps(void)
+{
+ static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
+ struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
+ unsigned long long facility_list_extended;
+ unsigned int facility_list;
+ int i;
+
+ facility_list = stfl();
+ /*
+ * The store facility list bits numbers as found in the principles
+ * of operation are numbered with bit 1UL<<31 as number 0 to
+ * bit 1UL<<0 as number 31.
+ * Bit 0: instructions named N3, "backported" to esa-mode
+ * Bit 2: z/Architecture mode is active
+ * Bit 7: the store-facility-list-extended facility is installed
+ * Bit 17: the message-security assist is installed
+ * Bit 19: the long-displacement facility is installed
+ * Bit 21: the extended-immediate facility is installed
+ * These get translated to:
+ * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
+ * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
+ * HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
+ */
+ for (i = 0; i < 6; i++)
+ if (facility_list & (1UL << (31 - stfl_bits[i])))
+ elf_hwcap |= 1UL << i;
+
+ /*
+ * Check for additional facilities with store-facility-list-extended.
+ * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
+ * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
+ * as stored by stfl, bits 32-xxx contain additional facilities.
+ * How many facility words are stored depends on the number of
+ * doublewords passed to the instruction. The additional facilites
+ * are:
+ * Bit 43: decimal floating point facility is installed
+ * translated to:
+ * HWCAP_S390_DFP bit 6.
+ */
+ if ((elf_hwcap & (1UL << 2)) &&
+ stfle(&facility_list_extended, 1) > 0) {
+ if (facility_list_extended & (1ULL << (64 - 43)))
+ elf_hwcap |= 1UL << 6;
+ }
+
+ switch (cpuinfo->cpu_id.machine) {
+ case 0x9672:
+#if !defined(CONFIG_64BIT)
+ default: /* Use "g5" as default for 31 bit kernels. */
+#endif
+ strcpy(elf_platform, "g5");
+ break;
+ case 0x2064:
+ case 0x2066:
+#if defined(CONFIG_64BIT)
+ default: /* Use "z900" as default for 64 bit kernels. */
+#endif
+ strcpy(elf_platform, "z900");
+ break;
+ case 0x2084:
+ case 0x2086:
+ strcpy(elf_platform, "z990");
+ break;
+ case 0x2094:
+ strcpy(elf_platform, "z9-109");
+ break;
+ }
+}
+
/*
* Setup function called from init/main.c just after the banner
* was printed.
@@ -805,6 +899,11 @@ setup_arch(char **cmdline_p)
smp_setup_cpu_possible_map();
/*
+ * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
+ */
+ setup_hwcaps();
+
+ /*
* Create kernel page tables and switch to virtual addressing.
*/
paging_init();
@@ -839,8 +938,12 @@ void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
static int show_cpuinfo(struct seq_file *m, void *v)
{
+ static const char *hwcap_str[7] = {
+ "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp"
+ };
struct cpuinfo_S390 *cpuinfo;
unsigned long n = (unsigned long) v - 1;
+ int i;
s390_adjust_jiffies();
preempt_disable();
@@ -850,7 +953,13 @@ static int show_cpuinfo(struct seq_file *m, void *v)
"bogomips per cpu: %lu.%02lu\n",
num_online_cpus(), loops_per_jiffy/(500000/HZ),
(loops_per_jiffy/(5000/HZ))%100);
+ seq_puts(m, "features\t: ");
+ for (i = 0; i < 7; i++)
+ if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
+ seq_printf(m, "%s ", hwcap_str[i]);
+ seq_puts(m, "\n");
}
+
if (cpu_online(n)) {
#ifdef CONFIG_SMP
if (smp_processor_id() == n)