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src/mte_vatag: define lowest and highest virtual addresses for U and S #13

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Jan 4, 2025
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src/mte_vatag: define lowest and highest virtual addresses for U and S #13

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18 changes: 18 additions & 0 deletions src/mte_vatag.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -80,3 +80,21 @@ spanning VITT range. VITT range is defined as below
tag_memory_region_end = mc_tag_va(HIGHEST_VADDR_CURR_PRIV)
LOWEST_VADDR_CURR_PRIV: Lowest virtual address in current privilege.
HIGHEST_VADDR_CURR_PRIV: Highest virtual address in current privilege.

.Lowest and highest virtual addresses
[width=100%]
[%header, cols="^4,^12"]
|===
|Privilege level | LOWEST_VADDR_CURR_PRIV | HIGHEST_VADDR_CURR_PRIV
| U | 0 | 2 ^ (VADDR_BITS) - 1
| S / HS / VS | 2 ^ (VADDR_BITS) | 2 ^ (VADDR_BITS) OR (2 ^ (VADDR_BITS) - 1)
| M | `Impl. defined` | `Impl. defined`
|===

VADDR_BITS is virtual addressing bits. VADDR_BITS can be 39, 48 or 57
depending on Sv39, Sv48 or Sv57 virtual addressing mode in `satp` CSR.

`Svatag` assumes an even split in address space between user and supervisor
with user address space spanning from zero to maxium positive address while
supervisor address space spanning from minimum negative value to maximum
negative value.
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