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sparc64: Add detection for features new in SPARC-T4.

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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@davemloft.net>
This commit is contained in:
David S. Miller
2012-08-16 16:41:04 -07:00
parent 6dab7ede93
commit 6f859c0e96
3 changed files with 78 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

67
arch/sparc/kernel/setup_64.c
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@@ -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;