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linker: add CONFIG_KERNEL_LINK_IN_VIRT

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This adds the kconfig CONFIG_KERNEL_LINK_IN_VIRT and supporting
kconfigs to indicate that the linker script can link the kernel
in virtual address space. This is needed for demand paging where
the kernel can be bigger than physical address space.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This commit is contained in:
Daniel Leung 2021-02-19 14:18:36 -08:00 • committed by Anas Nashif
commit 3d457e1a36
1 changed files with 17 additions and 0 deletions
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17
Kconfig.zephyr
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@ -183,6 +183,23 @@ config SRAM_OFFSET
If unsure, leave at the default value 0. If unsure, leave at the default value 0.
config CAN_LINK_IN_VIRT
bool
help
Hidden option to indicate that the architecture, SoC or board
linker script can link the kernel in virtual address space.
config KERNEL_LINK_IN_VIRT
bool "Link Kernel in Virtual Address Space"
depends on MMU
depends on CAN_LINK_IN_VIRT
help
Enable linking the kernel in virtual address space defined by
KERNEL_VM_BASE, KERNEL_VM_SIZE and KERNEL_VM_OFFSET.
Requires linker script support. If unsure, says N and the kernel
will be linked in physical address space.
endmenu endmenu
menu "Compiler Options" menu "Compiler Options"