linux-kernel - [PATCH 1/6] powerpc/32s: add an option to exclusively select powerpc 601

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Message-Id: <d644eaf7dff8cc149260066802af230bdf34fded.1566834712.git.christophe.leroy@c-s.fr>
Date:   Mon, 26 Aug 2019 15:52:13 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 1/6] powerpc/32s: add an option to exclusively select powerpc
 601

Powerpc 601 is rather old powerpc which as some important
limitations compared to other book3s/32 powerpcs:
- No Timebase.
- Common BATs for instruction and data.
- No execution protection in segment registers.
- No RI bit in MSR
- ...

It is starting to be difficult and cumbersome to maintain
kernels that are compatible both with 601 and other 6xx cores.

Create a compiletime option to exclusively select either powerpc 601
or other 6xx.

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/platforms/Kconfig.cputype | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 56a7c814160d..68c5cc075bfc 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -6,6 +6,9 @@ config PPC64
 	  This option selects whether a 32-bit or a 64-bit kernel
 	  will be built.
 
+config PPC_BOOK3S_32
+	bool
+
 menu "Processor support"
 choice
 	prompt "Processor Type"
@@ -21,13 +24,20 @@ choice
 
 	  If unsure, select 52xx/6xx/7xx/74xx/82xx/83xx/86xx.
 
-config PPC_BOOK3S_32
-	bool "512x/52xx/6xx/7xx/74xx/82xx/83xx/86xx"
+config PPC_BOOK3S_6xx
+	bool "512x/52xx/6xx/7xx/74xx/82xx/83xx/86xx except 601"
+	select PPC_BOOK3S_32
 	select PPC_FPU
 	select PPC_HAVE_PMU_SUPPORT
 	select PPC_HAVE_KUEP
 	select PPC_HAVE_KUAP
 
+config PPC_BOOK3S_601
+	bool "PowerPC 601"
+	select PPC_BOOK3S_32
+	select PPC_FPU
+	select PPC_HAVE_KUAP
+
 config PPC_85xx
 	bool "Freescale 85xx"
 	select E500
-- 
2.13.3