riscv aspec: rename kernelBase to kernelELFBase and update address space layout comment
This commit is contained in:
Victor Phan
Gerwin Klein
parent
0661581e44
commit
453233faad
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@ -27,45 +27,59 @@ abbreviation (input) "toPAddr \<equiv> id"
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abbreviation (input) "fromPAddr \<equiv> id"
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abbreviation (input) "fromPAddr \<equiv> id"
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(* Address space layout:
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(* Address space layout:
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The top half of the address space is reserved for the kernel. This means that 256 top level
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entries are for the user, and 256 are for the kernel. This will be further split into the
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'regular' kernel window, which contains mappings to physical memory, a small (1GiB) higher
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kernel image window that we use for running the actual kernel from and a top 1GiB window for
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kernel device mappings. This means that between PPTR_BASE and
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KERNEL_BASE there are 254 entries remaining, which represents how much physical memory
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can be used.
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+-----------------------------+ 2^64
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Almost all of the top 256 kernel entries will contain 1GiB page mappings. The only 2 entries
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| Kernel Devices |
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that contain a 2nd level PageTable consisting of 2MiB page entries is the entry
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+-------------------PPTR_KDEV-+ 2^64 - 1GiB
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for the 1GiB Kernel ELF region and the 1GiB region corresponding to the physical memory
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| Kernel ELF |
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of the kernel ELF in the kernel window. The same 2nd level PageTable is used and so both
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+-----------------KERNEL_BASE-+ --+ 2^64 - 2GiB
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entries refer to the same 1GiB of physical memory.
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This means that the 1GiB kernel ELF mapping will correspond to physical memory with a 1GiB
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alignment.
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| PSpace | |
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| (direct kernel mappings) | +----+
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+-------------------PPTR_BASE-+ --+ 2^64 - 2^c
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| | +-------------------------+
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| Invalid | | | |
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| (not canonical) | | | not |
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| | | | kernel |
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| | | | addressable |
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+-----------------------------+ 2^c | | |
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| | | +- --------------------------+ PADDR_TOP =
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| | | | | | KERNEL_BASE - PPTR_BASE
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| User | | | | |
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| | +------+ +-------------------------+ PADDR_LOAD + 1GiB
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| | kernel | | Kernel ELF |
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| | addressable | +-------------------------+ PADDR_LOAD
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+-----------------------------+ 0 +- +-------------------------+ 0 PADDR_BASE
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virtual address space physical address space
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+-----------------------------+ 2^64
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| Kernel Devices |
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-> +-------------------PPTR_KDEV-+ 2^64 - 1GiB
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| | Kernel ELF |
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----| +-------------KERNEL_ELF_BASE-+ --+ 2^64 - 2GiB + (PADDR_LOAD % 1GiB)
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| -> +-----------------KERNEL_BASE-+ --+ 2^64 - 2GiB
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Shared 1GiB| | | |
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table entry| | PSpace | |
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| | (direct kernel mappings) | +----+
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------>| | | |
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+-------------------PPTR_BASE-+ --+ 2^64 - 2^c
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| | | +-------------------------+
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| Invalid | | | |
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| | | | not |
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| | | | kernel |
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| | | | addressable |
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+-----------------------------+ 2^c | | |
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| | | +- --------------------------+ PADDR_TOP =
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| | | | | | KERNEL_BASE - PPTR_BASE
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| User | | | | |
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| | +------+ +-------------------------+ PADDR_HIGH_TOP =
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| | kernel | | Kernel ELF | (PPTR_KDEV - KERNEL_ELF_BASE + PADDR_LOAD)
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| | addressable | +-------------------------+ PADDR_LOAD
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+-----------------------------+ 0 +- +-------------------------+ 0 PADDR_BASE
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virtual address space physical address space
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c = one less than number of bits the page tables can translate
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c = one less than number of bits the page tables can translate
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@ -78,12 +92,12 @@ definition canonical_bit :: nat
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where
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where
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"canonical_bit = 38"
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"canonical_bit = 38"
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definition kernelBase :: word64
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definition kernelELFBase :: word64
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where
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where
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"kernelBase = - (1 << 31) + 0x4000000" (* 2^64 - 2 GiB + 2^26 *)
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"kernelELFBase = - (1 << 31) + 0x4000000" (* 2^64 - 2 GiB + 2^26 *)
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lemma "kernelBase = 0xFFFFFFFF84000000" (* Sanity check with C *)
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lemma "kernelELFBase = 0xFFFFFFFF84000000" (* Sanity check with C *)
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by (simp add: kernelBase_def)
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by (simp add: kernelELFBase_def)
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definition paddrLoad :: word64
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definition paddrLoad :: word64
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where
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where
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@ -91,7 +105,7 @@ definition paddrLoad :: word64
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definition kernelBaseOffset :: word64
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definition kernelBaseOffset :: word64
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where
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where
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"kernelBaseOffset = kernelBase - paddrLoad"
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"kernelBaseOffset = kernelELFBase - paddrLoad"
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definition pptrBase :: word64
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definition pptrBase :: word64
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where
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where
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