[PATCH 3/7] [RFC] add support for BlueGene/P FPU

From: Eric Van Hensbergen
Date: Wed May 18 2011 - 17:25:23 EST

This patch adds save/restore register support for the BlueGene/P
double hummer FPU.

Signed-off-by: Eric Van Hensbergen <ericvh@xxxxxxxxx>
arch/powerpc/include/asm/ppc_asm.h | 39 ++++++++++++++++++++++++-----------
arch/powerpc/kernel/fpu.S | 8 +++---
arch/powerpc/platforms/44x/Kconfig | 9 ++++++++
3 files changed, 40 insertions(+), 16 deletions(-)

diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index 9821006..daa22bb 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
REST_10GPRS(22, base)

+#ifdef CONFIG_BGP
+#define LFPDX(frt, ra, rb) .long (31<<26)|((frt)<<21)|((ra)<<16)| \
+ ((rb)<<11)|(462<<1)
+#define STFPDX(frt, ra, rb) .long (31<<26)|((frt)<<21)|((ra)<<16)| \
+ ((rb)<<11)|(974<<1)
+#endif /* CONFIG_BGP */
#define SAVE_2GPRS(n, base) SAVE_GPR(n, base); SAVE_GPR(n+1, base)
#define SAVE_4GPRS(n, base) SAVE_2GPRS(n, base); SAVE_2GPRS(n+2, base)
#define SAVE_8GPRS(n, base) SAVE_4GPRS(n, base); SAVE_4GPRS(n+4, base)
#define REST_8GPRS(n, base) REST_4GPRS(n, base); REST_4GPRS(n+4, base)
#define REST_10GPRS(n, base) REST_8GPRS(n, base); REST_2GPRS(n+8, base)

-#define SAVE_FPR(n, base) stfd n,THREAD_FPR0+8*TS_FPRWIDTH*(n)(base)
-#define SAVE_2FPRS(n, base) SAVE_FPR(n, base); SAVE_FPR(n+1, base)
-#define SAVE_4FPRS(n, base) SAVE_2FPRS(n, base); SAVE_2FPRS(n+2, base)
-#define SAVE_8FPRS(n, base) SAVE_4FPRS(n, base); SAVE_4FPRS(n+4, base)
-#define SAVE_16FPRS(n, base) SAVE_8FPRS(n, base); SAVE_8FPRS(n+8, base)
-#define SAVE_32FPRS(n, base) SAVE_16FPRS(n, base); SAVE_16FPRS(n+16, base)
-#define REST_FPR(n, base) lfd n,THREAD_FPR0+8*TS_FPRWIDTH*(n)(base)
-#define REST_2FPRS(n, base) REST_FPR(n, base); REST_FPR(n+1, base)
-#define REST_4FPRS(n, base) REST_2FPRS(n, base); REST_2FPRS(n+2, base)
-#define REST_8FPRS(n, base) REST_4FPRS(n, base); REST_4FPRS(n+4, base)
-#define REST_16FPRS(n, base) REST_8FPRS(n, base); REST_8FPRS(n+8, base)
-#define REST_32FPRS(n, base) REST_16FPRS(n, base); REST_16FPRS(n+16, base)
+#ifdef CONFIG_BGP
+#define SAVE_FPR(n, b, base) li b, THREAD_FPR0+(16*(n)); STFPDX(n, base, b)
+#define REST_FPR(n, b, base) li b, THREAD_FPR0+(16*(n)); LFPDX(n, base, b)
+#else /* CONFIG_BGP */
+#define SAVE_FPR(n, b, base) (stfd n, THREAD_FPR0+8*TS_FPRWIDTH*(n)(base))
+#define REST_FPR(n, b, base) (lfd n, THREAD_FPR0+8*TS_FPRWIDTH*(n)(base))
+#endif /* CONFIG_BGP */
+#define SAVE_2FPRS(n, b, base) SAVE_FPR(n, b, base); SAVE_FPR(n+1, b, base)
+#define SAVE_4FPRS(n, b, base) SAVE_2FPRS(n, b, base); SAVE_2FPRS(n+2, b, base)
+#define SAVE_8FPRS(n, b, base) SAVE_4FPRS(n, b, base); SAVE_4FPRS(n+4, b, base)
+#define SAVE_16FPRS(n, b, base) SAVE_8FPRS(n, b, base); SAVE_8FPRS(n+8, b, base)
+#define SAVE_32FPRS(n, b, base) SAVE_16FPRS(n, b, base); \
+ SAVE_16FPRS(n+16, b, base)
+#define REST_2FPRS(n, b, base) REST_FPR(n, b, base); REST_FPR(n+1, b, base)
+#define REST_4FPRS(n, b, base) REST_2FPRS(n, b, base); REST_2FPRS(n+2, b, base)
+#define REST_8FPRS(n, b, base) REST_4FPRS(n, b, base); REST_4FPRS(n+4, b, base)
+#define REST_16FPRS(n, b, base) REST_8FPRS(n, b, base); REST_8FPRS(n+8, b, base)
+#define REST_32FPRS(n, b, base) REST_16FPRS(n, b, base); \
+ REST_16FPRS(n+16, b, base)

#define SAVE_VR(n,b,base) li b,THREAD_VR0+(16*(n)); stvx n,base,b
#define SAVE_2VRS(n,b,base) SAVE_VR(n,b,base); SAVE_VR(n+1,b,base)
diff --git a/arch/powerpc/kernel/fpu.S b/arch/powerpc/kernel/fpu.S
index de36955..9f11c66 100644
--- a/arch/powerpc/kernel/fpu.S
+++ b/arch/powerpc/kernel/fpu.S
@@ -30,7 +30,7 @@
b 2f; \
- REST_32FPRS(n,base); \
+ REST_32FPRS(n,c,base); \
b 3f; \
2: REST_32VSRS(n,c,base); \
@@ -39,13 +39,13 @@ END_FTR_SECTION_IFSET(CPU_FTR_VSX); \
b 2f; \
- SAVE_32FPRS(n,base); \
+ SAVE_32FPRS(n,c,base); \
b 3f; \
2: SAVE_32VSRS(n,c,base); \
-#define REST_32FPVSRS(n,b,base) REST_32FPRS(n, base)
-#define SAVE_32FPVSRS(n,b,base) SAVE_32FPRS(n, base)
+#define REST_32FPVSRS(n,b,base) REST_32FPRS(n,b,base)
+#define SAVE_32FPVSRS(n,b,base) SAVE_32FPRS(n,b,base)

diff --git a/arch/powerpc/platforms/44x/Kconfig b/arch/powerpc/platforms/44x/Kconfig
index f485fc5f..24a515e 100644
--- a/arch/powerpc/platforms/44x/Kconfig
+++ b/arch/powerpc/platforms/44x/Kconfig
@@ -169,6 +169,15 @@ config YOSEMITE
This option enables support for the AMCC PPC440EP evaluation board.

+config BGP
+ bool "Blue Gene/P"
+ depends on 44x
+ default n
+ select PPC_FPU
+ help
+ This option enables support for the IBM BlueGene/P supercomputer.
config ISS4xx
bool "ISS 4xx Simulator"
depends on (44x || 40x)

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