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-rw-r--r--arch/riscv/Kconfig36
1 files changed, 27 insertions, 9 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index bc7598fc5f00..ca3b5541ae93 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -26,15 +26,15 @@ config RISCV
select GENERIC_IRQ_SHOW
select GENERIC_PCI_IOMAP
select GENERIC_SCHED_CLOCK
- select GENERIC_STRNCPY_FROM_USER
- select GENERIC_STRNLEN_USER
+ select GENERIC_STRNCPY_FROM_USER if MMU
+ select GENERIC_STRNLEN_USER if MMU
select GENERIC_SMP_IDLE_THREAD
select GENERIC_ATOMIC64 if !64BIT
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ASM_MODVERSIONS
select HAVE_MEMBLOCK_NODE_MAP
- select HAVE_DMA_CONTIGUOUS
+ select HAVE_DMA_CONTIGUOUS if MMU
select HAVE_FUTEX_CMPXCHG if FUTEX
select HAVE_PERF_EVENTS
select HAVE_PERF_REGS
@@ -51,6 +51,7 @@ config RISCV
select PCI_DOMAINS_GENERIC if PCI
select PCI_MSI if PCI
select RISCV_TIMER
+ select UACCESS_MEMCPY if !MMU
select GENERIC_IRQ_MULTI_HANDLER
select GENERIC_ARCH_TOPOLOGY if SMP
select ARCH_HAS_PTE_SPECIAL
@@ -61,7 +62,7 @@ config RISCV
select ARCH_WANT_HUGE_PMD_SHARE if 64BIT
select SPARSEMEM_STATIC if 32BIT
select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
- select HAVE_ARCH_MMAP_RND_BITS
+ select HAVE_ARCH_MMAP_RND_BITS if MMU
config ARCH_MMAP_RND_BITS_MIN
default 18 if 64BIT
@@ -73,8 +74,23 @@ config ARCH_MMAP_RND_BITS_MAX
default 24 if 64BIT # SV39 based
default 17
+# set if we run in machine mode, cleared if we run in supervisor mode
+config RISCV_M_MODE
+ bool
+ default !MMU
+
+# set if we are running in S-mode and can use SBI calls
+config RISCV_SBI
+ bool
+ depends on !RISCV_M_MODE
+ default y
+
config MMU
- def_bool y
+ bool "MMU-based Paged Memory Management Support"
+ default y
+ help
+ Select if you want MMU-based virtualised addressing space
+ support by paged memory management. If unsure, say 'Y'.
config ZONE_DMA32
bool
@@ -93,6 +109,7 @@ config PA_BITS
config PAGE_OFFSET
hex
default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
+ default 0x80000000 if 64BIT && !MMU
default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
@@ -136,7 +153,7 @@ config GENERIC_HWEIGHT
def_bool y
config FIX_EARLYCON_MEM
- def_bool y
+ def_bool CONFIG_MMU
config PGTABLE_LEVELS
int
@@ -161,6 +178,7 @@ config ARCH_RV32I
select GENERIC_LIB_ASHRDI3
select GENERIC_LIB_LSHRDI3
select GENERIC_LIB_UCMPDI2
+ select MMU
config ARCH_RV64I
bool "RV64I"
@@ -169,9 +187,9 @@ config ARCH_RV64I
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FTRACE_MCOUNT_RECORD
- select HAVE_DYNAMIC_FTRACE
- select HAVE_DYNAMIC_FTRACE_WITH_REGS
- select SWIOTLB
+ select HAVE_DYNAMIC_FTRACE if MMU
+ select HAVE_DYNAMIC_FTRACE_WITH_REGS if HAVE_DYNAMIC_FTRACE
+ select SWIOTLB if MMU
endchoice