1ca227a1b5
Add helper functions to get kernel image location. This removes any dependencies from the rest of the code on symbols and defines. It also avoid passing a parameter though various functions. Signed-off-by: Axel Heider <axelheider@gmx.de>
54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
/*
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* Copyright 2014, General Dynamics C4 Systems
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*/
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#pragma once
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/* Each architecture defines a set of constants in #defines. These
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* constants describe the memory regions of the kernel's portion of the
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* address space including the physical memory window, the kernel ELF
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* region, and the device region.
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*
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* - USER_TOP: The first address after the end of user memory
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*
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* - PADDR_BASE: The first physical address mapped in the kernel's
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* physical memory window.
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* - PPTR_BASE: The first virtual address of the kernel's physical
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* memory window.
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* - PPTR_TOP: The first virtual address after the end of the kernel's
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* physical memory window.
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*
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* - KERNEL_ELF_PADDR_BASE: The first physical address used to map the
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* initial kernel image. The kernel ELF is mapped contiguously
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* starting at this address.
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* - KERNEL_ELF_BASE: The first virtual address used to map the initial
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* kernel image.
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*
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* - KDEV_BASE: The first virtual address used to map devices.
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*/
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/* The offset from a physical address to a virtual address in the
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* physical memory window. */
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#define PPTR_BASE_OFFSET (PPTR_BASE - PADDR_BASE)
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/* The last address in the physical memory region mapped into the
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* physical memory window */
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#define PADDR_TOP (PPTR_TOP - PPTR_BASE_OFFSET)
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/* The kernel base offset is a way to translate the kernel image segment
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* from virtual to physical. This translation must be a single offset
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* for for the entire segment (i.e. the kernel image must be contiguous
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* both virtually and physically) */
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#define KERNEL_ELF_BASE_OFFSET (KERNEL_ELF_BASE - KERNEL_ELF_PADDR_BASE)
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#ifndef __ASSEMBLER__
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/* This symbol is generated by the linker and marks the last valid
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* address in the kernel's virtual region */
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extern char ki_end[1];
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#define KERNEL_ELF_TOP ((paddr_t)ki_end)
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#endif /* __ASSEMBLER__ */
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#include <mode/hardware.h>
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