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Subject[patch 9/9] add hardware capability support (ELF_HWCAP).
From: Martin Schwidefsky <schwidefsky@de.ibm.com>

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
arch/s390/kernel/setup.c | 109 +++++++++++++++++++++++++++++++++++++++++++++
include/asm-s390/elf.h | 7 ++
include/asm-s390/lowcore.h | 10 ++--
3 files changed, 120 insertions(+), 6 deletions(-)
Index: quilt-2.6/arch/s390/kernel/setup.c
===================================================================
--- quilt-2.6.orig/arch/s390/kernel/setup.c 2007-05-04 18:50:14.000000000 +0200
+++ quilt-2.6/arch/s390/kernel/setup.c 2007-05-04 18:50:16.000000000 +0200
@@ -74,6 +74,8 @@
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 @@
#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 @@
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 @@

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 @@
"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)
Index: quilt-2.6/include/asm-s390/elf.h
===================================================================
--- quilt-2.6.orig/include/asm-s390/elf.h 2007-05-04 18:48:36.000000000 +0200
+++ quilt-2.6/include/asm-s390/elf.h 2007-05-04 18:50:16.000000000 +0200
@@ -188,7 +188,8 @@
/* This yields a mask that user programs can use to figure out what
instruction set this CPU supports. */

-#define ELF_HWCAP (0)
+extern unsigned long elf_hwcap;
+#define ELF_HWCAP (elf_hwcap)

/* This yields a string that ld.so will use to load implementation
specific libraries for optimization. This is more specific in
@@ -197,7 +198,9 @@
For the moment, we have only optimizations for the Intel generations,
but that could change... */

-#define ELF_PLATFORM (NULL)
+#define ELF_PLATFORM_SIZE 8
+extern char elf_platform[];
+#define ELF_PLATFORM (elf_platform)

#ifndef __s390x__
#define SET_PERSONALITY(ex, ibcs2) set_personality((ibcs2)?PER_SVR4:PER_LINUX)
Index: quilt-2.6/include/asm-s390/lowcore.h
===================================================================
--- quilt-2.6.orig/include/asm-s390/lowcore.h 2007-05-04 18:48:36.000000000 +0200
+++ quilt-2.6/include/asm-s390/lowcore.h 2007-05-04 18:50:16.000000000 +0200
@@ -229,17 +229,19 @@
__u16 subchannel_nr; /* 0x0ba */
__u32 io_int_parm; /* 0x0bc */
__u32 io_int_word; /* 0x0c0 */
- __u8 pad3[0xD4-0xC4]; /* 0x0c4 */
+ __u8 pad3[0xc8-0xc4]; /* 0x0c4 */
+ __u32 stfl_fac_list; /* 0x0c8 */
+ __u8 pad4[0xd4-0xcc]; /* 0x0cc */
__u32 extended_save_area_addr; /* 0x0d4 */
__u32 cpu_timer_save_area[2]; /* 0x0d8 */
__u32 clock_comp_save_area[2]; /* 0x0e0 */
__u32 mcck_interruption_code[2]; /* 0x0e8 */
- __u8 pad4[0xf4-0xf0]; /* 0x0f0 */
+ __u8 pad5[0xf4-0xf0]; /* 0x0f0 */
__u32 external_damage_code; /* 0x0f4 */
__u32 failing_storage_address; /* 0x0f8 */
- __u8 pad5[0x100-0xfc]; /* 0x0fc */
+ __u8 pad6[0x100-0xfc]; /* 0x0fc */
__u32 st_status_fixed_logout[4];/* 0x100 */
- __u8 pad6[0x120-0x110]; /* 0x110 */
+ __u8 pad7[0x120-0x110]; /* 0x110 */
__u32 access_regs_save_area[16];/* 0x120 */
__u32 floating_pt_save_area[8]; /* 0x160 */
__u32 gpregs_save_area[16]; /* 0x180 */
--
blue skies,
Martin.

"Reality continues to ruin my life." - Calvin.

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