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https://github.com/brain-hackers/u-boot-brain
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200182a748
Add code to jump to a 64-bit Linux kernel. We need to set up a flat page table structure, a new GDT and then go through a few hoops in the right order. Signed-off-by: Simon Glass <sjg@chromium.org>
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/*
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* Copyright (c) 2014 The Chromium OS Authors.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __X86_CPU_H
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#define __X86_CPU_H
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/**
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* cpu_enable_paging_pae() - Enable PAE-paging
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*
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* @pdpt: Value to set in cr3 (PDPT or PML4T)
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*/
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void cpu_enable_paging_pae(ulong cr3);
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/**
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* cpu_disable_paging_pae() - Disable paging and PAE
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*/
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void cpu_disable_paging_pae(void);
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/**
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* cpu_has_64bit() - Check if the CPU has 64-bit support
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*
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* @return 1 if this CPU supports long mode (64-bit), 0 if not
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*/
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int cpu_has_64bit(void);
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/**
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* cpu_call64() - Jump to a 64-bit Linux kernel (internal function)
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*
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* The kernel is uncompressed and the 64-bit entry point is expected to be
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* at @target.
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*
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* This function is used internally - see cpu_jump_to_64bit() for a more
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* useful function.
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*
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* @pgtable: Address of 24KB area containing the page table
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* @setup_base: Pointer to the setup.bin information for the kernel
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* @target: Pointer to the start of the kernel image
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*/
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void cpu_call64(ulong pgtable, ulong setup_base, ulong target);
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/**
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* cpu_jump_to_64bit() - Jump to a 64-bit Linux kernel
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*
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* The kernel is uncompressed and the 64-bit entry point is expected to be
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* at @target.
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*
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* @setup_base: Pointer to the setup.bin information for the kernel
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* @target: Pointer to the start of the kernel image
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*/
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int cpu_jump_to_64bit(ulong setup_base, ulong target);
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#endif
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