Compare and branch, pause, and the various new cryptographic opcodes.
We advertise the crypto opcodes to userspace using one hwcap bit,
HWCAP_SPARC_CRYPTO.
This essentially indicates that the %cfr register can be interrograted
and used to determine exactly which crypto opcodes are available on
the current cpu.
We use the %cfr register to report all of the crypto opcodes available
in the bootup CPU caps log message, and via /proc/cpuinfo.
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
---
arch/sparc/include/asm/elf_64.h | 9 ++++++
arch/sparc/include/asm/pstate.h | 14 ++++++++
arch/sparc/kernel/setup_64.c | 67 ++++++++++++++++++++++++++++++++-------
3 files changed, 78 insertions(+), 12 deletions(-)
diff --git a/arch/sparc/include/asm/elf_64.h b/arch/sparc/include/asm/elf_64.h
index 7df8b7f..370ca1e 100644
--- a/arch/sparc/include/asm/elf_64.h
+++ b/arch/sparc/include/asm/elf_64.h
@@ -86,6 +86,15 @@
#define AV_SPARC_IMA 0x00400000 /* integer multiply-add */
#define AV_SPARC_ASI_CACHE_SPARING \
0x00800000 /* cache sparing ASIs available */
+#define AV_SPARC_PAUSE 0x01000000 /* PAUSE available */
+#define AV_SPARC_CBCOND 0x02000000 /* CBCOND insns available */
+
+/* Solaris decided to enumerate every single crypto instruction type
+ * in the AT_HWCAP bits. This is wasteful, since if crypto is present,
+ * you still need to look in the CFR register to see if the opcode is
+ * really available. So we simply advertise only "crypto" support.
+ */
+#define HWCAP_SPARC_CRYPTO 0x04000000 /* CRYPTO insns available */
#define CORE_DUMP_USE_REGSET
diff --git a/arch/sparc/include/asm/pstate.h b/arch/sparc/include/asm/pstate.h
index a26a537..6dfa8f8 100644
--- a/arch/sparc/include/asm/pstate.h
+++ b/arch/sparc/include/asm/pstate.h
@@ -88,4 +88,18 @@
#define VERS_MAXTL _AC(0x000000000000ff00,UL) /* Max Trap Level. */
#define VERS_MAXWIN _AC(0x000000000000001f,UL) /* Max RegWindow Idx.*/
+/* Compatability Feature Register (%asr26), SPARC-T4 and later */
+#define CFR_AES _AC(0x0000000000000001,UL) /* Supports AES opcodes */
+#define CFR_DES _AC(0x0000000000000002,UL) /* Supports DES opcodes */
+#define CFR_KASUMI _AC(0x0000000000000004,UL) /* Supports KASUMI opcodes */
+#define CFR_CAMELIA _AC(0x0000000000000008,UL) /* Supports CAMELIA opcodes */
+#define CFR_MD5 _AC(0x0000000000000010,UL) /* Supports MD5 opcodes */
+#define CFR_SHA1 _AC(0x0000000000000020,UL) /* Supports SHA1 opcodes */
+#define CFR_SHA256 _AC(0x0000000000000040,UL) /* Supports SHA256 opcodes */
+#define CFR_SHA512 _AC(0x0000000000000080,UL) /* Supports SHA512 opcodes */
+#define CFR_MPMUL _AC(0x0000000000000100,UL) /* Supports MPMUL opcodes */
+#define CFR_MONTMUL _AC(0x0000000000000200,UL) /* Supports MONTMUL opcodes */
+#define CFR_MONTSQR _AC(0x0000000000000400,UL) /* Supports MONTSQR opcodes */
+#define CFR_CRC32C _AC(0x0000000000000800,UL) /* Supports CRC32C opcodes */
+
#endif /* !(_SPARC64_PSTATE_H) */
diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index 1414d16..0800e71 100644
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -340,7 +340,12 @@ static const char *hwcaps[] = {
*/
"mul32", "div32", "fsmuld", "v8plus", "popc", "vis", "vis2",
"ASIBlkInit", "fmaf", "vis3", "hpc", "random", "trans", "fjfmau",
- "ima", "cspare",
+ "ima", "cspare", "pause", "cbcond",
+};
+
+static const char *crypto_hwcaps[] = {
+ "aes", "des", "kasumi", "camellia", "md5", "sha1", "sha256",
+ "sha512", "mpmul", "montmul", "montsqr", "crc32c",
};
void cpucap_info(struct seq_file *m)
@@ -357,27 +362,61 @@ void cpucap_info(struct seq_file *m)
printed++;
}
}
+ if (caps & HWCAP_SPARC_CRYPTO) {
+ unsigned long cfr;
+
+ __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
+ for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
+ unsigned long bit = 1UL << i;
+ if (cfr & bit) {
+ seq_printf(m, "%s%s",
+ printed ? "," : "", crypto_hwcaps[i]);
+ printed++;
+ }
+ }
+ }
seq_putc(m, '\n');
}
+static void __init report_one_hwcap(int *printed, const char *name)
+{
+ if ((*printed) == 0)
+ printk(KERN_INFO "CPU CAPS: [");
+ printk(KERN_CONT "%s%s",
+ (*printed) ? "," : "", name);
+ if (++(*printed) == 8) {
+ printk(KERN_CONT "]\n");
+ *printed = 0;
+ }
+}
+
+static void __init report_crypto_hwcaps(int *printed)
+{
+ unsigned long cfr;
+ int i;
+
+ __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
+
+ for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
+ unsigned long bit = 1UL << i;
+ if (cfr & bit)
+ report_one_hwcap(printed, crypto_hwcaps[i]);
+ }
+}
+
static void __init report_hwcaps(unsigned long caps)
{
int i, printed = 0;
- printk(KERN_INFO "CPU CAPS: [");
for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
unsigned long bit = 1UL << i;
- if (caps & bit) {
- printk(KERN_CONT "%s%s",
- printed ? "," : "", hwcaps[i]);
- if (++printed == 8) {
- printk(KERN_CONT "]\n");
- printk(KERN_INFO "CPU CAPS: [");
- printed = 0;
- }
- }
+ if (caps & bit)
+ report_one_hwcap(&printed, hwcaps[i]);
}
- printk(KERN_CONT "]\n");
+ if (caps & HWCAP_SPARC_CRYPTO)
+ report_crypto_hwcaps(&printed);
+ if (printed != 0)
+ printk(KERN_CONT "]\n");
}
static unsigned long __init mdesc_cpu_hwcap_list(void)
@@ -411,6 +450,10 @@ static unsigned long __init mdesc_cpu_hwcap_list(void)
break;
}
}
+ for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
+ if (!strcmp(prop, crypto_hwcaps[i]))
+ caps |= HWCAP_SPARC_CRYPTO;
+ }
plen = strlen(prop) + 1;
prop += plen;
--
1.7.10.4
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