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Kernel: Add mechanism to make some memory read-only after init finishes

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You can now use the READONLY_AFTER_INIT macro when declaring a variable
and we will put it in a special ".ro_after_init" section in the kernel.

Data in that section remains writable during the boot and init process,
and is then marked read-only just before launching the SystemServer.

This is based on an idea from the Linux kernel. :^)
This commit is contained in:
Andreas Kling 2021-02-14 17:35:07 +01:00
parent 917f7d668c
commit d8013c60bb
5 changed files with 28 additions and 0 deletions
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7
Kernel/linker.ld
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@ -43,6 +43,13 @@ SECTIONS
end_of_kernel_data = .;
}
.ro_after_init ALIGN(4K) (NOLOAD) : AT(ADDR(.ro_after_init) - 0xc0000000)
{
start_of_ro_after_init = .;
*(.ro_after_init);
end_of_ro_after_init = .;
}
.bss ALIGN(4K) (NOLOAD) : AT (ADDR(.bss) - 0xc0000000)
{
start_of_kernel_bss = .;