512cb905d1
This adds both boot and pinned sections to the linker script for ia32. This is required for enabling demand paging for kernel and data. Signed-off-by: Daniel Leung <daniel.leung@intel.com>
58 lines
1.5 KiB
Plaintext
58 lines
1.5 KiB
Plaintext
/*
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* Copyright (c) 2021 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifdef CONFIG_X86_KPTI
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MMU_PAGE_ALIGN_PERM
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z_shared_kernel_page_start = .;
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/* Special page containing supervisor data that is still mapped in
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* user mode page tables. IDT, GDT, TSSes, trampoline stack, and
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* any LDT must go here as they always must live in a page that is
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* marked 'present'. Still not directly user accessible, but
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* no sensitive data should be here as Meltdown exploits may read it.
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*/
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#endif /* CONFIG_X86_KPTI */
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#ifdef CONFIG_DYNAMIC_INTERRUPTS
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. = ALIGN(8);
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_idt_base_address = .;
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#ifdef LINKER_ZEPHYR_FINAL
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KEEP(*(staticIdt))
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#else
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. += CONFIG_IDT_NUM_VECTORS * 8;
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#endif /* LINKER_ZEPHYR_FINAL */
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#endif /* CONFIG_DYNAMIC_INTERRUPTS */
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#ifdef CONFIG_GDT_DYNAMIC
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KEEP(*(.tss))
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. = ALIGN(8);
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_gdt = .;
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#ifdef LINKER_ZEPHYR_FINAL
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KEEP(*(gdt))
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#else /* LINKER_ZEPHYR_FINAL */
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#ifdef CONFIG_USERSPACE
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#define GDT_NUM_ENTRIES 7
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#elif defined(CONFIG_HW_STACK_PROTECTION)
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#define GDT_NUM_ENTRIES 5
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#else
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#define GDT_NUM_ENTRIES 3
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#endif /* CONFIG_X86_USERSPACE */
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. += GDT_NUM_ENTRIES * 8;
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#endif /* LINKER_ZEPHYR_FINAL */
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#endif /* CONFIG_GDT_DYNAMIC */
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#ifdef CONFIG_X86_KPTI
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z_trampoline_stack_start = .;
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MMU_PAGE_ALIGN_PERM
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z_trampoline_stack_end = .;
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z_shared_kernel_page_end = .;
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ASSERT(z_trampoline_stack_end - z_trampoline_stack_start >= 40,
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"trampoline stack too small");
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ASSERT(z_shared_kernel_page_end - z_shared_kernel_page_start == 4096,
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"shared kernel area is not one memory page");
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#endif /* CONFIG_X86_KPTI */
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