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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2020-08-18 17:19:18 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-12-04 01:01:12 +1100 |
| commit | 7d68c89169508064c460a1208f38ed0589d226fa (patch) | |
| tree | f05cb2b4a8fa03e5a10d3299b77b1414b9921187 | |
| parent | b6254ced4da6cf28d49fbffe24ee4b3286dcb3f4 (diff) | |
| download | linux-7d68c89169508064c460a1208f38ed0589d226fa.tar.gz linux-7d68c89169508064c460a1208f38ed0589d226fa.tar.bz2 linux-7d68c89169508064c460a1208f38ed0589d226fa.zip | |
powerpc/32s: Allow deselecting CONFIG_PPC_FPU on mpc832x
The e300c2 core which is embedded in mpc832x CPU doesn't have
an FPU.
Make it possible to not select CONFIG_PPC_FPU when building a
kernel dedicated to that target.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/fcdc60d85baf80eaa0a7f3261d9d889282068216.1597770847.git.christophe.leroy@csgroup.eu
| -rw-r--r-- | arch/powerpc/kernel/head_book3s_32.S | 4 | ||||
| -rw-r--r-- | arch/powerpc/platforms/Kconfig.cputype | 11 |
2 files changed, 13 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S index ed25d9991233..bbcc84c5cf5f 100644 --- a/arch/powerpc/kernel/head_book3s_32.S +++ b/arch/powerpc/kernel/head_book3s_32.S @@ -394,6 +394,7 @@ Alignment: . = 0x800 DO_KVM 0x800 FPUnavailable: +#ifdef CONFIG_PPC_FPU BEGIN_FTR_SECTION /* * Certain Freescale cores don't have a FPU and treat fp instructions @@ -407,6 +408,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE) b fast_exception_return 1: addi r3,r1,STACK_FRAME_OVERHEAD EXC_XFER_LITE(0x800, kernel_fp_unavailable_exception) +#else + b ProgramCheck +#endif /* Decrementer */ EXCEPTION(0x900, Decrementer, timer_interrupt, EXC_XFER_LITE) diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype index 3e36e3712deb..44ab03fbcadc 100644 --- a/arch/powerpc/platforms/Kconfig.cputype +++ b/arch/powerpc/platforms/Kconfig.cputype @@ -32,7 +32,7 @@ choice config PPC_BOOK3S_6xx bool "512x/52xx/6xx/7xx/74xx/82xx/83xx/86xx" select PPC_BOOK3S_32 - select PPC_FPU + imply PPC_FPU select PPC_HAVE_PMU_SUPPORT select PPC_HAVE_KUEP select PPC_HAVE_KUAP @@ -222,9 +222,16 @@ config PPC_FPU_REGS bool config PPC_FPU - bool + bool "Support for Floating Point Unit (FPU)" if PPC_MPC832x default y if PPC64 select PPC_FPU_REGS + help + This must be enabled to support the Floating Point Unit + Most 6xx have an FPU but e300c2 core (mpc832x) don't have + an FPU, so when building an embedded kernel for that target + you can disable FPU support. + + If unsure say Y. config FSL_EMB_PERFMON bool "Freescale Embedded Perfmon" |