Commit c5b42169 authored by Xianting Tian's avatar Xianting Tian Committed by Palmer Dabbelt

Documentation: kdump: describe VMCOREINFO export for RISCV64

The following interrelated definitions and ranges are needed by the
kdump crash tool, which are exported by
"arch/riscv/kernel/crash_core.c":

    VA_BITS,
    PAGE_OFFSET,
    phys_ram_base,
    KERNEL_LINK_ADDR,
    MODULES_VADDR ~ MODULES_END,
    VMALLOC_START ~ VMALLOC_END,
    VMEMMAP_START ~ VMEMMAP_END,

Document these RISCV64 exports above.
Reviewed-by: default avatarBagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: default avatarXianting Tian <xianting.tian@linux.alibaba.com>
Acked-by: default avatarBaoquan He <bhe@redhat.com>
Link: https://lore.kernel.org/r/20221026144208.373504-3-xianting.tian@linux.alibaba.com
[Palmer: wrap commit text]
Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 649d6b10
...@@ -595,3 +595,32 @@ X2TLB ...@@ -595,3 +595,32 @@ X2TLB
----- -----
Indicates whether the crashed kernel enabled SH extended mode. Indicates whether the crashed kernel enabled SH extended mode.
RISCV64
=======
VA_BITS
-------
The maximum number of bits for virtual addresses. Used to compute the
virtual memory ranges.
PAGE_OFFSET
-----------
Indicates the virtual kernel start address of the direct-mapped RAM region.
phys_ram_base
-------------
Indicates the start physical RAM address.
MODULES_VADDR|MODULES_END|VMALLOC_START|VMALLOC_END|VMEMMAP_START|VMEMMAP_END|KERNEL_LINK_ADDR
----------------------------------------------------------------------------------------------
Used to get the correct ranges:
* MODULES_VADDR ~ MODULES_END : Kernel module space.
* VMALLOC_START ~ VMALLOC_END : vmalloc() / ioremap() space.
* VMEMMAP_START ~ VMEMMAP_END : vmemmap space, used for struct page array.
* KERNEL_LINK_ADDR : start address of Kernel link and BPF
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