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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
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9
arch/sparc/include/asm/elf_64.h
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@@ -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