From: Aurelien Jarno <aurelien@aurel32.net>
To: Richard Henderson <rth@twiddle.net>
Cc: qemu-devel@nongnu.org, agraf@suse.de
Subject: Re: [Qemu-devel] [PATCH 15/35] tcg-s390: Query instruction extensions that are installed.
Date: Sat, 12 Jun 2010 13:57:09 +0200 [thread overview]
Message-ID: <20100612115709.GL3008@ohm.aurel32.net> (raw)
In-Reply-To: <4C123528.6050500@twiddle.net>
On Fri, Jun 11, 2010 at 06:07:52AM -0700, Richard Henderson wrote:
> On 06/11/2010 01:06 AM, Aurelien Jarno wrote:
> > What's the difference between FACILITY_ZARCH and FACILITY_ZARCH_ACTIVE,
> > as both are actually flagged together. My guess is that
> > FACILITY_ZARCH_ACTIVE is needed in 64-bit mode, why FACILITY_ZARCH is
> > only needed for a possible future 32-bit mode. Is it correct?
>
> Loosely,
>
> ZARCH is set when the system is 64-bit capable, whether or not it is active.
> The OS would check this bit at startup if it wanted to change modes. This
> bit isn't really interesting to us in userspace.
>
> ZARCH_ACTIVE is set when the system is in 64-bit mode, i.e. you've booted
> with a 64-bit kernel. Note that this says nothing about the address
> decoding mode -- this bit can be set while the PSW is set for 31-bit
> address translation, e.g. running a 32-bit program on a 64-bit kernel.
>
So in short we never use ZARCH in QEMU, so we probably don't want to
have this #define, nor add it at the same time as FACILITY_ZARCH_ACTIVE.
--
Aurelien Jarno GPG: 1024D/F1BCDB73
aurelien@aurel32.net http://www.aurel32.net
next prev parent reply other threads:[~2010-06-12 12:22 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-04 19:14 [Qemu-devel] [PATCH 00/35] S390 TCG target, version 2 Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 01/35] tcg-s390: Adjust compilation flags Richard Henderson
2010-06-09 22:53 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 02/35] s390x: Avoid _llseek Richard Henderson
2010-06-09 22:54 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 03/35] s390x: Don't use a linker script for user-only Richard Henderson
2010-06-09 22:54 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 04/35] tcg-s390: Compute is_write in cpu_signal_handler Richard Henderson
2010-06-09 22:54 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 05/35] tcg-s390: Icache flush is a no-op Richard Henderson
2010-06-09 22:55 ` Aurelien Jarno
2010-06-10 22:04 ` Richard Henderson
2010-06-11 6:46 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 06/35] tcg-s390: Allocate the code_gen_buffer near the main program Richard Henderson
2010-06-09 22:59 ` Aurelien Jarno
2010-06-10 22:05 ` Richard Henderson
2010-06-11 7:31 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 07/35] tcg: Optionally sign-extend 32-bit arguments for 64-bit host Richard Henderson
2010-06-10 10:22 ` Aurelien Jarno
2010-06-10 22:08 ` Richard Henderson
2010-06-14 22:20 ` Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 08/35] s390: Update disassembler to the last GPLv2 from binutils Richard Henderson
2010-06-09 22:47 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 09/35] s390: Disassemble some general-instruction-extension insns Richard Henderson
2010-06-09 22:47 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 10/35] tcg-s390: New TCG target Richard Henderson
2010-06-10 10:24 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 11/35] tcg-s390: Tidy unimplemented opcodes Richard Henderson
2010-06-10 10:24 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 12/35] tcg-s390: Define TCG_TMP0 Richard Henderson
2010-06-10 10:25 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 13/35] tcg-s390: Tidy regset initialization; use R14 as temporary Richard Henderson
2010-06-10 10:26 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 14/35] tcg-s390: Rearrange register allocation order Richard Henderson
2010-06-10 10:26 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 15/35] tcg-s390: Query instruction extensions that are installed Richard Henderson
2010-06-10 10:28 ` Aurelien Jarno
2010-06-10 22:19 ` Richard Henderson
2010-06-11 8:06 ` Aurelien Jarno
2010-06-11 13:07 ` Richard Henderson
2010-06-12 11:57 ` Aurelien Jarno [this message]
2010-06-11 13:13 ` Richard Henderson
2010-06-13 10:49 ` Aurelien Jarno
2010-06-13 16:02 ` Richard Henderson
2010-06-13 16:44 ` Aurelien Jarno
2010-06-13 22:23 ` Alexander Graf
2010-06-14 16:20 ` Richard Henderson
2010-06-14 17:39 ` Alexander Graf
2010-06-04 19:14 ` [Qemu-devel] [PATCH 16/35] tcg-s390: Re-implement tcg_out_movi Richard Henderson
2010-06-12 12:04 ` Aurelien Jarno
2010-06-13 23:19 ` Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 17/35] tcg-s390: Implement sign and zero-extension operations Richard Henderson
2010-06-12 12:32 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 18/35] tcg-s390: Implement bswap operations Richard Henderson
2010-06-12 12:32 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 19/35] tcg-s390: Implement rotates Richard Henderson
2010-06-12 12:33 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 20/35] tcg-s390: Use LOAD COMPLIMENT for negate Richard Henderson
2010-06-12 12:33 ` Aurelien Jarno
2010-06-04 19:14 ` [Qemu-devel] [PATCH 21/35] tcg-s390: Use the ADD IMMEDIATE instructions Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 22/35] tcg-s390: Use the AND " Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 23/35] tcg-s390: Use the OR " Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 24/35] tcg-s390: Use the XOR " Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 25/35] tcg-s390: Use the MULTIPLY " Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 26/35] tcg-s390: Tidy goto_tb Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 27/35] tcg-s390: Rearrange qemu_ld/st to avoid register copy Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 28/35] tcg-s390: Tidy tcg_prepare_qemu_ldst Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 29/35] tcg-s390: Tidy user qemu_ld/st Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 30/35] tcg-s390: Implement GUEST_BASE Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 31/35] tcg-s390: Use 16-bit branches for forward jumps Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 32/35] tcg-s390: Use the LOAD AND TEST instruction for compares Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 33/35] tcg-s390: Use the COMPARE IMMEDIATE instrucions " Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 34/35] tcg-s390: Use COMPARE AND BRANCH instructions Richard Henderson
2010-06-04 19:14 ` [Qemu-devel] [PATCH 35/35] tcg-s390: Enable compile in 32-bit mode Richard Henderson
2010-06-08 13:11 ` [Qemu-devel] Re: [PATCH 00/35] S390 TCG target, version 2 Alexander Graf
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