diff options
| author | Zong Li <zong.li@sifive.com> | 2020-03-12 03:58:35 +0100 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-03-26 17:29:49 +0100 |
| commit | 59c4da8640ccf4721d54d36835706f3eefb521a4 (patch) | |
| tree | 598f0449ad9a5643de09202de7b9268f72e33f55 /arch/riscv/include | |
| parent | riscv: patch code by fixmap mapping (diff) | |
| download | linux-59c4da8640ccf4721d54d36835706f3eefb521a4.tar.xz linux-59c4da8640ccf4721d54d36835706f3eefb521a4.zip | |
riscv: Add support to dump the kernel page tables
In a similar manner to arm64, x86, powerpc, etc., it can traverse all
page tables, and dump the page table layout with the memory types and
permissions.
Add a debugfs file at /sys/kernel/debug/kernel_page_tables to export
the page table layout to userspace.
Signed-off-by: Zong Li <zong.li@sifive.com>
Tested-by: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/include')
| -rw-r--r-- | arch/riscv/include/asm/pgtable.h | 10 | ||||
| -rw-r--r-- | arch/riscv/include/asm/ptdump.h | 11 |
2 files changed, 21 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 393f2014dfee..9c188ad2e52d 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -449,6 +449,16 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma, #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) /* + * In the RV64 Linux scheme, we give the user half of the virtual-address space + * and give the kernel the other (upper) half. + */ +#ifdef CONFIG_64BIT +#define KERN_VIRT_START (-(BIT(CONFIG_VA_BITS)) + TASK_SIZE) +#else +#define KERN_VIRT_START FIXADDR_START +#endif + +/* * Task size is 0x4000000000 for RV64 or 0x9fc00000 for RV32. * Note that PGDIR_SIZE must evenly divide TASK_SIZE. */ diff --git a/arch/riscv/include/asm/ptdump.h b/arch/riscv/include/asm/ptdump.h new file mode 100644 index 000000000000..e29af7191909 --- /dev/null +++ b/arch/riscv/include/asm/ptdump.h @@ -0,0 +1,11 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2019 SiFive + */ + +#ifndef _ASM_RISCV_PTDUMP_H +#define _ASM_RISCV_PTDUMP_H + +void ptdump_check_wx(void); + +#endif /* _ASM_RISCV_PTDUMP_H */ |