7af710d988
XIP (eXecute In Place) kernel image is the image that can be run directly from ROM, using RAM only for writable data. XIP xtensa kernel differs from regular xtensa kernel in the following ways: - it has exception/IRQ vectors merged into text section. No vectors relocation takes place at kernel startup. - .data/.bss location must be specified in the kernel configuration, its content is copied there in the _startup function. - .init.text is merged with the rest of text and is executed from ROM. - when MMU is used the virtual address where the kernel will be mapped must be specified in the kernel configuration. It may be in the KSEG or in the KIO, __pa macro is adjusted to be able to handle both. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/*
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* arch/xtensa/include/asm/xchal_vaddr_remap.h
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*
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* Xtensa macros for MMU V3 Support. Deals with re-mapping the Virtual
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* Memory Addresses from "Virtual == Physical" to their prevvious V2 MMU
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* mappings (KSEG at 0xD0000000 and KIO at 0XF0000000).
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2008 - 2012 Tensilica Inc.
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*
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* Pete Delaney <piet@tensilica.com>
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* Marc Gauthier <marc@tensilica.com
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*/
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#ifndef _XTENSA_VECTORS_H
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#define _XTENSA_VECTORS_H
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#include <asm/core.h>
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#include <asm/kmem_layout.h>
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#if defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
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#ifdef CONFIG_KERNEL_VIRTUAL_ADDRESS
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#define KERNELOFFSET CONFIG_KERNEL_VIRTUAL_ADDRESS
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#else
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#define KERNELOFFSET (CONFIG_KERNEL_LOAD_ADDRESS + \
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XCHAL_KSEG_CACHED_VADDR - \
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XCHAL_KSEG_PADDR)
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#endif
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#else
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#define KERNELOFFSET CONFIG_KERNEL_LOAD_ADDRESS
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#endif
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#define RESET_VECTOR1_VADDR (XCHAL_RESET_VECTOR1_VADDR)
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#ifdef CONFIG_VECTORS_OFFSET
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#define VECBASE_VADDR (KERNELOFFSET - CONFIG_VECTORS_OFFSET)
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#else
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#define VECBASE_VADDR _vecbase
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#endif
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#if defined(XCHAL_HAVE_VECBASE) && XCHAL_HAVE_VECBASE
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#define VECTOR_VADDR(offset) (VECBASE_VADDR + offset)
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#define USER_VECTOR_VADDR VECTOR_VADDR(XCHAL_USER_VECOFS)
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#define KERNEL_VECTOR_VADDR VECTOR_VADDR(XCHAL_KERNEL_VECOFS)
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#define DOUBLEEXC_VECTOR_VADDR VECTOR_VADDR(XCHAL_DOUBLEEXC_VECOFS)
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#define WINDOW_VECTORS_VADDR VECTOR_VADDR(XCHAL_WINDOW_OF4_VECOFS)
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#define INTLEVEL2_VECTOR_VADDR VECTOR_VADDR(XCHAL_INTLEVEL2_VECOFS)
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#define INTLEVEL3_VECTOR_VADDR VECTOR_VADDR(XCHAL_INTLEVEL3_VECOFS)
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#define INTLEVEL4_VECTOR_VADDR VECTOR_VADDR(XCHAL_INTLEVEL4_VECOFS)
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#define INTLEVEL5_VECTOR_VADDR VECTOR_VADDR(XCHAL_INTLEVEL5_VECOFS)
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#define INTLEVEL6_VECTOR_VADDR VECTOR_VADDR(XCHAL_INTLEVEL6_VECOFS)
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#define INTLEVEL7_VECTOR_VADDR VECTOR_VADDR(XCHAL_INTLEVEL7_VECOFS)
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#define DEBUG_VECTOR_VADDR VECTOR_VADDR(XCHAL_DEBUG_VECOFS)
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/*
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* These XCHAL_* #defines from varian/core.h
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* are not valid to use with V3 MMU. Non-XCHAL
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* constants are defined above and should be used.
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*/
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#undef XCHAL_VECBASE_RESET_VADDR
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#undef XCHAL_USER_VECTOR_VADDR
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#undef XCHAL_KERNEL_VECTOR_VADDR
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#undef XCHAL_DOUBLEEXC_VECTOR_VADDR
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#undef XCHAL_WINDOW_VECTORS_VADDR
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#undef XCHAL_INTLEVEL2_VECTOR_VADDR
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#undef XCHAL_INTLEVEL3_VECTOR_VADDR
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#undef XCHAL_INTLEVEL4_VECTOR_VADDR
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#undef XCHAL_INTLEVEL5_VECTOR_VADDR
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#undef XCHAL_INTLEVEL6_VECTOR_VADDR
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#undef XCHAL_INTLEVEL7_VECTOR_VADDR
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#undef XCHAL_DEBUG_VECTOR_VADDR
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#else
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#define USER_VECTOR_VADDR XCHAL_USER_VECTOR_VADDR
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#define KERNEL_VECTOR_VADDR XCHAL_KERNEL_VECTOR_VADDR
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#define DOUBLEEXC_VECTOR_VADDR XCHAL_DOUBLEEXC_VECTOR_VADDR
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#define WINDOW_VECTORS_VADDR XCHAL_WINDOW_VECTORS_VADDR
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#define INTLEVEL2_VECTOR_VADDR XCHAL_INTLEVEL2_VECTOR_VADDR
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#define INTLEVEL3_VECTOR_VADDR XCHAL_INTLEVEL3_VECTOR_VADDR
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#define INTLEVEL4_VECTOR_VADDR XCHAL_INTLEVEL4_VECTOR_VADDR
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#define INTLEVEL5_VECTOR_VADDR XCHAL_INTLEVEL5_VECTOR_VADDR
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#define INTLEVEL6_VECTOR_VADDR XCHAL_INTLEVEL6_VECTOR_VADDR
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#define INTLEVEL7_VECTOR_VADDR XCHAL_INTLEVEL6_VECTOR_VADDR
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#define DEBUG_VECTOR_VADDR XCHAL_DEBUG_VECTOR_VADDR
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#endif
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#endif /* _XTENSA_VECTORS_H */
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