@@ -26,13 +26,13 @@ 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_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_SYSCALL_TRACEPOINTS
@@ -47,6 +47,7 @@ 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
@@ -60,6 +61,7 @@ config RISCV
# 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
@@ -68,7 +70,11 @@ config RISCV_SBI
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
@@ -87,6 +93,7 @@ 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
@@ -130,7 +137,7 @@ config GENERIC_HWEIGHT
def_bool y
config FIX_EARLYCON_MEM
- def_bool y
+ def_bool CONFIG_MMU
config PGTABLE_LEVELS
int
@@ -155,6 +162,7 @@ config ARCH_RV32I
select GENERIC_LIB_ASHRDI3
select GENERIC_LIB_LSHRDI3
select GENERIC_LIB_UCMPDI2
+ select MMU
config ARCH_RV64I
bool "RV64I"
@@ -163,9 +171,9 @@ 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
new file mode 100644
@@ -0,0 +1,78 @@
+# CONFIG_CPU_ISOLATION is not set
+CONFIG_LOG_BUF_SHIFT=16
+CONFIG_PRINTK_SAFE_LOG_BUF_SHIFT=12
+CONFIG_BLK_DEV_INITRD=y
+# CONFIG_RD_BZIP2 is not set
+# CONFIG_RD_LZMA is not set
+# CONFIG_RD_XZ is not set
+# CONFIG_RD_LZO is not set
+# CONFIG_RD_LZ4 is not set
+CONFIG_CC_OPTIMIZE_FOR_SIZE=y
+CONFIG_EXPERT=y
+# CONFIG_SYSFS_SYSCALL is not set
+# CONFIG_FHANDLE is not set
+# CONFIG_BASE_FULL is not set
+# CONFIG_EPOLL is not set
+# CONFIG_SIGNALFD is not set
+# CONFIG_TIMERFD is not set
+# CONFIG_EVENTFD is not set
+# CONFIG_AIO is not set
+# CONFIG_IO_URING is not set
+# CONFIG_ADVISE_SYSCALLS is not set
+# CONFIG_MEMBARRIER is not set
+# CONFIG_KALLSYMS is not set
+# CONFIG_VM_EVENT_COUNTERS is not set
+# CONFIG_COMPAT_BRK is not set
+CONFIG_SLOB=y
+# CONFIG_SLAB_MERGE_DEFAULT is not set
+# CONFIG_MMU is not set
+CONFIG_MAXPHYSMEM_2GB=y
+CONFIG_SMP=y
+CONFIG_CMDLINE="root=/dev/vda rw earlycon=uart8250,mmio,0x10000000,115200n8 console=ttyS0"
+CONFIG_CMDLINE_FORCE=y
+# CONFIG_BLK_DEV_BSG is not set
+CONFIG_PARTITION_ADVANCED=y
+# CONFIG_MSDOS_PARTITION is not set
+# CONFIG_EFI_PARTITION is not set
+# CONFIG_MQ_IOSCHED_DEADLINE is not set
+# CONFIG_MQ_IOSCHED_KYBER is not set
+CONFIG_BINFMT_FLAT=y
+# CONFIG_COREDUMP is not set
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+# CONFIG_FW_LOADER is not set
+# CONFIG_ALLOW_DEV_COREDUMP is not set
+CONFIG_VIRTIO_BLK=y
+# CONFIG_INPUT_KEYBOARD is not set
+# CONFIG_INPUT_MOUSE is not set
+# CONFIG_SERIO is not set
+# CONFIG_LEGACY_PTYS is not set
+# CONFIG_LDISC_AUTOLOAD is not set
+# CONFIG_DEVMEM is not set
+CONFIG_SERIAL_8250=y
+# CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_8250_NR_UARTS=1
+CONFIG_SERIAL_8250_RUNTIME_UARTS=1
+CONFIG_SERIAL_OF_PLATFORM=y
+# CONFIG_HW_RANDOM is not set
+# CONFIG_HWMON is not set
+# CONFIG_LCD_CLASS_DEVICE is not set
+# CONFIG_BACKLIGHT_CLASS_DEVICE is not set
+# CONFIG_VGA_CONSOLE is not set
+# CONFIG_HID is not set
+# CONFIG_USB_SUPPORT is not set
+CONFIG_VIRTIO_MMIO=y
+CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y
+CONFIG_SIFIVE_PLIC=y
+# CONFIG_VALIDATE_FS_PARSER is not set
+CONFIG_EXT2_FS=y
+# CONFIG_DNOTIFY is not set
+# CONFIG_INOTIFY_USER is not set
+# CONFIG_MISC_FILESYSTEMS is not set
+CONFIG_LSM="[]"
+CONFIG_PRINTK_TIME=y
+# CONFIG_SCHED_DEBUG is not set
+# CONFIG_RCU_TRACE is not set
+# CONFIG_FTRACE is not set
+# CONFIG_RUNTIME_TESTING_MENU is not set
@@ -11,4 +11,12 @@
#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
+/*
+ * RISC-V requires the stack pointer to be 16-byte aligned, so ensure that
+ * the flat loader aligns it accordingly.
+ */
+#ifndef CONFIG_MMU
+#define ARCH_SLAB_MINALIGN 16
+#endif
+
#endif /* _ASM_RISCV_CACHE_H */
@@ -56,16 +56,16 @@ extern unsigned long elf_hwcap;
*/
#define ELF_PLATFORM (NULL)
+#ifdef CONFIG_MMU
#define ARCH_DLINFO \
do { \
NEW_AUX_ENT(AT_SYSINFO_EHDR, \
(elf_addr_t)current->mm->context.vdso); \
} while (0)
-
-
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
struct linux_binprm;
extern int arch_setup_additional_pages(struct linux_binprm *bprm,
int uses_interp);
+#endif /* CONFIG_MMU */
#endif /* _ASM_RISCV_ELF_H */
@@ -11,6 +11,7 @@
#include <asm/page.h>
#include <asm/pgtable.h>
+#ifdef CONFIG_MMU
/*
* Here we define all the compile-time 'special' virtual addresses.
* The point is to have a constant address at compile time, but to
@@ -42,4 +43,5 @@ extern void __set_fixmap(enum fixed_addresses idx,
#include <asm-generic/fixmap.h>
+#endif /* CONFIG_MMU */
#endif /* _ASM_RISCV_FIXMAP_H */
@@ -12,6 +12,12 @@
#include <linux/errno.h>
#include <asm/asm.h>
+/* We don't even really need the extable code, but for now keep it simple */
+#ifndef CONFIG_MMU
+#define __enable_user_access() do { } while (0)
+#define __disable_user_access() do { } while (0)
+#endif
+
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
{ \
uintptr_t tmp; \
@@ -14,6 +14,7 @@
#include <linux/types.h>
#include <asm/mmiowb.h>
+#ifdef CONFIG_MMU
extern void __iomem *ioremap(phys_addr_t offset, unsigned long size);
/*
@@ -26,6 +27,9 @@ extern void __iomem *ioremap(phys_addr_t offset, unsigned long size);
#define ioremap_wt(addr, size) ioremap((addr), (size))
extern void iounmap(volatile void __iomem *addr);
+#else
+#define pgprot_noncached(x) (x)
+#endif /* CONFIG_MMU */
/* Generic IO read/write. These perform native-endian accesses. */
#define __raw_writeb __raw_writeb
@@ -10,6 +10,9 @@
#ifndef __ASSEMBLY__
typedef struct {
+#ifndef CONFIG_MMU
+ unsigned long end_brk;
+#endif
void *vdso;
#ifdef CONFIG_SMP
/* A local icache flush is needed before user execution can resume. */
@@ -88,8 +88,14 @@ typedef struct page *pgtable_t;
#define PTE_FMT "%08lx"
#endif
+#ifdef CONFIG_MMU
extern unsigned long va_pa_offset;
extern unsigned long pfn_base;
+#define ARCH_PFN_OFFSET (pfn_base)
+#else
+#define va_pa_offset 0
+#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
+#endif /* CONFIG_MMU */
extern unsigned long max_low_pfn;
extern unsigned long min_low_pfn;
@@ -112,11 +118,9 @@ extern unsigned long min_low_pfn;
#ifdef CONFIG_FLATMEM
#define pfn_valid(pfn) \
- (((pfn) >= pfn_base) && (((pfn)-pfn_base) < max_mapnr))
+ (((pfn) >= ARCH_PFN_OFFSET) && (((pfn) - ARCH_PFN_OFFSET) < max_mapnr))
#endif
-#define ARCH_PFN_OFFSET (pfn_base)
-
#endif /* __ASSEMBLY__ */
#define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr)))
@@ -10,6 +10,7 @@
#include <linux/mm.h>
#include <asm/tlb.h>
+#ifdef CONFIG_MMU
#include <asm-generic/pgalloc.h> /* for pte_{alloc,free}_one */
static inline void pmd_populate_kernel(struct mm_struct *mm,
@@ -81,6 +82,7 @@ do { \
pgtable_page_dtor(pte); \
tlb_remove_page((tlb), pte); \
} while (0)
+#endif /* CONFIG_MMU */
static inline void check_pgt_cache(void)
{
@@ -24,6 +24,7 @@
#include <asm/pgtable-32.h>
#endif /* CONFIG_64BIT */
+#ifdef CONFIG_MMU
/* Number of entries in the page global directory */
#define PTRS_PER_PGD (PAGE_SIZE / sizeof(pgd_t))
/* Number of entries in the page table */
@@ -31,7 +32,6 @@
/* Number of PGD entries that a user-mode program can use */
#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
-#define FIRST_USER_ADDRESS 0
/* Page protection bits */
#define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_USER)
@@ -96,13 +96,6 @@ extern pgd_t swapper_pg_dir[];
#define vmemmap ((struct page *)VMEMMAP_START)
-/*
- * ZERO_PAGE is a global shared page that is always zero,
- * used for zero-mapped memory areas, etc.
- */
-extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
-#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
-
static inline int pmd_present(pmd_t pmd)
{
return (pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROT_NONE));
@@ -416,22 +409,9 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
-#ifdef CONFIG_FLATMEM
-#define kern_addr_valid(addr) (1) /* FIXME */
-#endif
-
-extern void *dtb_early_va;
-extern void setup_bootmem(void);
-extern void paging_init(void);
-
-static inline void pgtable_cache_init(void)
-{
- /* No page table caches to initialize */
-}
-
-#define VMALLOC_SIZE (KERN_VIRT_SIZE >> 1)
-#define VMALLOC_END (PAGE_OFFSET - 1)
-#define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE)
+#define VMALLOC_SIZE (KERN_VIRT_SIZE >> 1)
+#define VMALLOC_END (PAGE_OFFSET - 1)
+#define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE)
#define FIXADDR_TOP VMALLOC_START
#ifdef CONFIG_64BIT
@@ -451,6 +431,38 @@ static inline void pgtable_cache_init(void)
#define TASK_SIZE FIXADDR_START
#endif
+#else /* CONFIG_MMU */
+
+#define PAGE_KERNEL __pgprot(0)
+#define swapper_pg_dir NULL
+#define VMALLOC_START 0
+
+#define TASK_SIZE 0xffffffffUL
+
+#endif /* !CONFIG_MMU */
+
+#ifdef CONFIG_FLATMEM
+#define kern_addr_valid(addr) (1) /* FIXME */
+#endif
+
+extern void *dtb_early_va;
+extern void setup_bootmem(void);
+extern void paging_init(void);
+
+static inline void pgtable_cache_init(void)
+{
+ /* No page table caches to initialize */
+}
+
+#define FIRST_USER_ADDRESS 0
+
+/*
+ * ZERO_PAGE is a global shared page that is always zero,
+ * used for zero-mapped memory areas, etc.
+ */
+extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
+#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
+
#include <asm-generic/pgtable.h>
#endif /* !__ASSEMBLY__ */
@@ -10,6 +10,7 @@
#include <linux/mm_types.h>
#include <asm/smp.h>
+#ifdef CONFIG_MMU
/*
* Flush entire local TLB. 'sfence.vma' implicitly fences with the instruction
* cache as well, so a 'fence.i' is not necessary.
@@ -24,14 +25,19 @@ static inline void local_flush_tlb_page(unsigned long addr)
{
__asm__ __volatile__ ("sfence.vma %0" : : "r" (addr) : "memory");
}
+#else /* CONFIG_MMU */
+#define local_flush_tlb_all() do { } while (0)
+#define local_flush_tlb_page(addr) do { } while (0)
+#endif /* CONFIG_MMU */
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) && defined(CONFIG_MMU)
void flush_tlb_all(void);
void flush_tlb_mm(struct mm_struct *mm);
void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr);
void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end);
-#else /* CONFIG_SMP */
+#else /* CONFIG_SMP && CONFIG_MMU */
+
#define flush_tlb_all() local_flush_tlb_all()
#define flush_tlb_page(vma, addr) local_flush_tlb_page(addr)
@@ -42,7 +48,7 @@ static inline void flush_tlb_range(struct vm_area_struct *vma,
}
#define flush_tlb_mm(mm) flush_tlb_all()
-#endif /* CONFIG_SMP */
+#endif /* !CONFIG_SMP || !CONFIG_MMU */
/* Flush a range of kernel pages */
static inline void flush_tlb_kernel_range(unsigned long start,
@@ -11,6 +11,7 @@
/*
* User space memory access functions
*/
+#ifdef CONFIG_MMU
#include <linux/errno.h>
#include <linux/compiler.h>
#include <linux/thread_info.h>
@@ -475,4 +476,7 @@ unsigned long __must_check clear_user(void __user *to, unsigned long n)
__ret; \
})
+#else /* CONFIG_MMU */
+#include <asm-generic/uaccess.h>
+#endif /* CONFIG_MMU */
#endif /* _ASM_RISCV_UACCESS_H */
@@ -25,9 +25,8 @@ obj-y += time.o
obj-y += traps.o
obj-y += riscv_ksyms.o
obj-y += stacktrace.o
-obj-y += vdso.o
obj-y += cacheinfo.o
-obj-y += vdso/
+obj-$(CONFIG_MMU) += vdso.o vdso/
obj-$(CONFIG_RISCV_M_MODE) += clint.o
obj-$(CONFIG_FPU) += fpu.o
@@ -370,6 +370,10 @@ ENTRY(__switch_to)
ret
ENDPROC(__switch_to)
+#ifndef CONFIG_MMU
+#define do_page_fault do_trap_unknown
+#endif
+
.section ".rodata"
/* Exception vector table */
ENTRY(excp_vect_table)
@@ -391,3 +395,10 @@ ENTRY(excp_vect_table)
RISCV_PTR do_page_fault /* store page fault */
excp_vect_table_end:
END(excp_vect_table)
+
+#ifndef CONFIG_MMU
+ENTRY(__user_rt_sigreturn)
+ li a7, __NR_rt_sigreturn
+ scall
+END(__user_rt_sigreturn)
+#endif
@@ -104,8 +104,10 @@ clear_bss_done:
la sp, init_thread_union + THREAD_SIZE
mv a0, s1
call setup_vm
+#ifdef CONFIG_MMU
la a0, early_pg_dir
call relocate
+#endif /* CONFIG_MMU */
/* Restore C environment */
la tp, init_task
@@ -116,6 +118,7 @@ clear_bss_done:
call parse_dtb
tail start_kernel
+#ifdef CONFIG_MMU
relocate:
/* Relocate return address */
li a1, PAGE_OFFSET
@@ -166,6 +169,7 @@ relocate:
sfence.vma
ret
+#endif /* CONFIG_MMU */
.Lsecondary_start:
#ifdef CONFIG_SMP
@@ -194,9 +198,11 @@ relocate:
beqz tp, .Lwait_for_cpu_up
fence
+#ifdef CONFIG_MMU
/* Enable virtual memory and relocate to virtual address */
la a0, swapper_pg_dir
call relocate
+#endif
tail smp_callin
#endif
@@ -17,11 +17,16 @@
#include <asm/switch_to.h>
#include <asm/csr.h>
+extern u32 __user_rt_sigreturn[2];
+
#define DEBUG_SIG 0
struct rt_sigframe {
struct siginfo info;
struct ucontext uc;
+#ifndef CONFIG_MMU
+ u32 sigreturn_code[2];
+#endif
};
#ifdef CONFIG_FPU
@@ -166,7 +171,6 @@ static inline void __user *get_sigframe(struct ksignal *ksig,
return (void __user *)sp;
}
-
static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
struct pt_regs *regs)
{
@@ -189,8 +193,19 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
return -EFAULT;
/* Set up to return from userspace. */
+#ifdef CONFIG_MMU
regs->ra = (unsigned long)VDSO_SYMBOL(
current->mm->context.vdso, rt_sigreturn);
+#else
+ /*
+ * For the nommu case we don't have a VDSO. Instead we push two
+ * instructions to call the rt_sigreturn syscall onto the user stack.
+ */
+ if (copy_to_user(&frame->sigreturn_code, __user_rt_sigreturn,
+ sizeof(frame->sigreturn_code)))
+ return -EFAULT;
+ regs->ra = (unsigned long)&frame->sigreturn_code;;
+#endif /* CONFIG_MMU */
/*
* Set up registers for signal handler.
@@ -1,7 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
-lib-y += delay.o
-lib-y += memcpy.o
-lib-y += memset.o
-lib-y += uaccess.o
-
-lib-$(CONFIG_64BIT) += tishift.o
+lib-y += delay.o
+lib-y += memcpy.o
+lib-y += memset.o
+lib-$(CONFIG_MMU) += uaccess.o
+lib-$(CONFIG_64BIT) += tishift.o
@@ -6,9 +6,8 @@ CFLAGS_REMOVE_init.o = -pg
endif
obj-y += init.o
-obj-y += fault.o
obj-y += extable.o
-obj-y += ioremap.o
+obj-$(CONFIG_MMU) += fault.o ioremap.o
obj-y += cacheflush.o
obj-y += context.o
obj-y += sifive_l2_cache.o
@@ -78,6 +78,7 @@ void flush_icache_mm(struct mm_struct *mm, bool local)
#endif /* CONFIG_SMP */
+#ifdef CONFIG_MMU
void flush_icache_pte(pte_t pte)
{
struct page *page = pte_page(pte);
@@ -85,3 +86,4 @@ void flush_icache_pte(pte_t pte)
if (!test_and_set_bit(PG_dcache_clean, &page->flags))
flush_icache_all();
}
+#endif /* CONFIG_MMU */
@@ -57,8 +57,10 @@ void switch_mm(struct mm_struct *prev, struct mm_struct *next,
cpumask_clear_cpu(cpu, mm_cpumask(prev));
cpumask_set_cpu(cpu, mm_cpumask(next));
+#ifdef CONFIG_MMU
csr_write(CSR_SATP, virt_to_pfn(next->pgd) | SATP_MODE);
local_flush_tlb_all();
+#endif
flush_icache_deferred(next);
}
@@ -23,6 +23,7 @@ unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
EXPORT_SYMBOL(empty_zero_page);
extern char _start[];
+void *dtb_early_va;
static void __init zone_sizes_init(void)
{
@@ -132,12 +133,12 @@ void __init setup_bootmem(void)
}
}
+#ifdef CONFIG_MMU
unsigned long va_pa_offset;
EXPORT_SYMBOL(va_pa_offset);
unsigned long pfn_base;
EXPORT_SYMBOL(pfn_base);
-void *dtb_early_va;
pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
@@ -438,6 +439,16 @@ static void __init setup_vm_final(void)
csr_write(CSR_SATP, PFN_DOWN(__pa(swapper_pg_dir)) | SATP_MODE);
local_flush_tlb_all();
}
+#else
+asmlinkage void __init setup_vm(uintptr_t dtb_pa)
+{
+ dtb_early_va = (void *)dtb_pa;
+}
+
+static inline void setup_vm_final(void)
+{
+}
+#endif /* CONFIG_MMU */
void __init paging_init(void)
{
The kernel runs in M-mode without using page tables, and thus can't run bare metal without help from additional firmware. Most of the patch is just stubbing out code not needed without page tables, but there is an interesting detail in the signals implementation: - The normal RISC-V syscall ABI only implements rt_sigreturn as VDSO entry point, but the ELF VDSO is not supported for nommu Linux. We instead copy the code to call the syscall onto the stack. In addition to enabling the nommu code a new defconfig for a small kernel image that can run in nommu mode on qemu is also provided, to run a kernel in qemu you can use the following command line: qemu-system-riscv64 -smp 2 -m 64 -machine virt -nographic \ -kernel arch/riscv/boot/loader \ -drive file=rootfs.ext2,format=raw,id=hd0 \ -device virtio-blk-device,drive=hd0 Contains contributions from Damien Le Moal <Damien.LeMoal@wdc.com>. Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/riscv/Kconfig | 24 +++++--- arch/riscv/configs/nommu_virt_defconfig | 78 +++++++++++++++++++++++++ arch/riscv/include/asm/cache.h | 8 +++ arch/riscv/include/asm/elf.h | 4 +- arch/riscv/include/asm/fixmap.h | 2 + arch/riscv/include/asm/futex.h | 6 ++ arch/riscv/include/asm/io.h | 4 ++ arch/riscv/include/asm/mmu.h | 3 + arch/riscv/include/asm/page.h | 10 +++- arch/riscv/include/asm/pgalloc.h | 2 + arch/riscv/include/asm/pgtable.h | 60 +++++++++++-------- arch/riscv/include/asm/tlbflush.h | 12 +++- arch/riscv/include/asm/uaccess.h | 4 ++ arch/riscv/kernel/Makefile | 3 +- arch/riscv/kernel/entry.S | 11 ++++ arch/riscv/kernel/head.S | 6 ++ arch/riscv/kernel/signal.c | 17 +++++- arch/riscv/lib/Makefile | 11 ++-- arch/riscv/mm/Makefile | 3 +- arch/riscv/mm/cacheflush.c | 2 + arch/riscv/mm/context.c | 2 + arch/riscv/mm/init.c | 13 ++++- 22 files changed, 233 insertions(+), 52 deletions(-) create mode 100644 arch/riscv/configs/nommu_virt_defconfig