Date: Fri, 23 Mar 2007 21:30:22 +0100
From: Aurelien Jarno <aurelien@aurel32.net>
Message-ID: <20070323203022.GF24731@amd64.aurel32.net>
MIME-Version: 1.0
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Subject: [Qemu-devel] [PATCH][SPARC] Switch the sun4m FPU to Meiko
Reply-To: qemu-devel@nongnu.org
To: qemu-devel@nongnu.org

Hi all,

The current FPU model on the sun4m SPARC is the Fujitsu MB86910.
It supports very few instructions.

The patch below changes the FPU to the Meiko L64804. It is the one that
can be found on the microSPARC-II CPU, ie the one that is present in the
SparcStation 5. All the instructions supported by this FPU (ie all SPARC
v8 ones except quad precision ones) are already implemented in QEMU.

Bye,
Aurelien


Index: target-sparc/cpu.h
===================================================================
RCS file: /sources/qemu/qemu/target-sparc/cpu.h,v
retrieving revision 1.27
diff -u -d -p -r1.27 cpu.h
--- target-sparc/cpu.h	31 Jan 2007 12:16:51 -0000	1.27
+++ target-sparc/cpu.h	23 Mar 2007 20:11:29 -0000
@@ -235,7 +237,8 @@ typedef struct CPUSPARCState {
 #define GET_VER(env) ((0x17ULL << 48) | (0x11ULL << 32) |		\
 		      (0 << 24) | (MAXTL << 8) | (NWINDOWS - 1))
 #else
-#define GET_FSR32(env) (env->fsr)
+/* Implementation 0, version 4 (Meiko FPU) */
+#define GET_FSR32(env) (env->fsr | 0x00080000)
 #define PUT_FSR32(env, val) do { uint32_t _tmp = val;	\
 	env->fsr = _tmp & 0xcfc1ffff;			\
     } while (0)

-- 
  .''`.  Aurelien Jarno	            | GPG: 1024D/F1BCDB73
 : :' :  Debian developer           | Electrical Engineer
 `. `'   aurel32@debian.org         | aurelien@aurel32.net
   `-    people.debian.org/~aurel32 | www.aurel32.net