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x86: generate page tables at runtime

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Removes very complex boot-time generation of page tables
with a much simpler runtime generation of them at bootup.

For those x86 boards that enable the MMU in the defconfig,
set the number of page pool pages appropriately.

The MMU_RUNTIME_* flags have been removed. They were an
artifact of the old page table generation and did not
correspond to any hardware state.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2019-07-31 14:21:14 -07:00 • committed by Andrew Boie
commit c3b3aafaec
15 changed files with 250 additions and 701 deletions
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11
arch/x86/core/Kconfig.ia32
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@ -129,9 +129,18 @@ config X86_MMU
select MEMORY_PROTECTION
help
This options enables the memory management unit present in x86
and creates a set of page tables at build time. Requires an MMU
and creates a set of page tables at boot time. Requires an MMU
which supports PAE page tables.
config X86_MMU_PAGE_POOL_PAGES
int "Number of pages to reserve for building page tables"
default 16
depends on X86_MMU
help
Building page tables at boot requires a pool of free memory pages
to construct it. This can't be derived at build time, tune this
to your SoC's specific memory map.
config X86_NO_MELTDOWN
bool
help