284 lines
7.3 KiB
C++
284 lines
7.3 KiB
C++
/*
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* Copyright (c) 2010 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Ali Saidi
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*/
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#ifndef __ARCH_ARM_LINUX_ATAG_HH__
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#define __ARCH_ARM_LINUX_ATAG_HH__
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#include <cstring>
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#include <string>
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#include "base/types.hh"
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enum {
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CoreTag = 0x54410001,
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MemTag = 0x54410002,
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RevTag = 0x54410007,
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SerialTag = 0x54410006,
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CmdTag = 0x54410009,
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NoneTag = 0x00000000,
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};
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class AtagHeader
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{
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protected:
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uint32_t *storage;
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uint32_t _size;
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public:
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/** Tag (normally starts with 'T''A' and 16 bits of number */
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virtual uint32_t tag() = 0;
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/** If the header should be 0 size */
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virtual bool null() { return false; }
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uint32_t size() const { return _size; }
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AtagHeader(uint32_t s)
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: _size(s)
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{
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storage = new uint32_t[size()];
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}
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virtual ~AtagHeader()
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{
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delete[] storage;
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}
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uint32_t copyOut(uint8_t *p)
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{
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storage[0] = null() ? 0 : size();
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storage[1] = tag();
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memcpy(p, storage, size() << 2);
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return size() << 2;
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}
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};
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class AtagCore : public AtagHeader
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{
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public:
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static const uint32_t Size = 5;
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uint32_t tag() { return CoreTag; }
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void flags(uint32_t i) { storage[2] = i; }
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void pagesize(uint32_t i) { storage[3] = i; }
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void rootdev(uint32_t i) { storage[4] = i; }
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AtagCore()
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: AtagHeader(Size)
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{}
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};
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class AtagMem : public AtagHeader
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{
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public:
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static const uint32_t Size = 4;
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uint32_t tag() { return MemTag; }
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void memSize(uint32_t i) { storage[2] = i; }
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void memStart(uint32_t i) { storage[3] = i; }
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AtagMem()
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: AtagHeader(Size)
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{}
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};
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class AtagRev : public AtagHeader
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{
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public:
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static const uint32_t Size = 3;
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uint32_t tag() { return RevTag; }
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void rev(uint32_t i) { storage[2] = i; }
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AtagRev()
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: AtagHeader(Size)
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{}
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};
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class AtagSerial : public AtagHeader
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{
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public:
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static const uint32_t Size = 4;
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uint32_t tag() { return SerialTag; }
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void sn(uint64_t i) { storage[2] = (uint32_t)i; storage[3] = i >> 32; }
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AtagSerial()
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: AtagHeader(Size)
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{}
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};
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class AtagCmdline : public AtagHeader
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{
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public:
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static const uint32_t Size = 3;
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uint32_t tag() { return CmdTag; }
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void cmdline(const std::string &s)
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{
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// Add one for null terminator
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int len = s.length() + 1;
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// 2 + ceiling(len/4)
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_size = 2 + ((len + 3) >> 2);
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delete[] storage;
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storage = new uint32_t[size()];
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strcpy((char*)&storage[2] , s.c_str());
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}
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AtagCmdline()
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: AtagHeader(Size)
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{}
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};
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class AtagNone : public AtagHeader
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{
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public:
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static const uint32_t Size = 2;
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virtual bool null() { return true; }
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uint32_t tag() { return NoneTag; }
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AtagNone()
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: AtagHeader(Size)
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{}
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};
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/*
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//
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// example ARM Linux bootloader code
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// this example is distributed under the BSD licence
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// Code taken from http://www.simtec.co.uk/products/SWLINUX/files/booting_article.html
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///
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// list of possible tags
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#define ATAG_NONE 0x00000000
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#define ATAG_CORE 0x54410001
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#define ATAG_MEM 0x54410002
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#define ATAG_VIDEOTEXT 0x54410003
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#define ATAG_RAMDISK 0x54410004
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#define ATAG_INITRD2 0x54420005
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#define ATAG_SERIAL 0x54410006
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#define ATAG_REVISION 0x54410007
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#define ATAG_VIDEOLFB 0x54410008
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#define ATAG_CMDLINE 0x54410009
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// structures for each atag
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struct atag_header {
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u32 size; // length of tag in words including this header
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u32 tag; // tag type
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};
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struct atag_core {
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u32 flags;
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u32 pagesize;
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u32 rootdev;
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};
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struct atag_mem {
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u32 size;
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u32 start;
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};
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struct atag_videotext {
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u8 x;
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u8 y;
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u16 video_page;
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u8 video_mode;
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u8 video_cols;
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u16 video_ega_bx;
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u8 video_lines;
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u8 video_isvga;
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u16 video_points;
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};
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struct atag_ramdisk {
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u32 flags;
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u32 size;
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u32 start;
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};
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struct atag_initrd2 {
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u32 start;
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u32 size;
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};
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struct atag_serialnr {
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u32 low;
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u32 high;
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};
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struct atag_revision {
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u32 rev;
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};
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struct atag_videolfb {
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u16 lfb_width;
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u16 lfb_height;
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u16 lfb_depth;
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u16 lfb_linelength;
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u32 lfb_base;
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u32 lfb_size;
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u8 red_size;
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u8 red_pos;
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u8 green_size;
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u8 green_pos;
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u8 blue_size;
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u8 blue_pos;
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u8 rsvd_size;
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u8 rsvd_pos;
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};
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struct atag_cmdline {
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char cmdline[1];
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};
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struct atag {
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struct atag_header hdr;
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union {
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struct atag_core core;
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struct atag_mem mem;
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struct atag_videotext videotext;
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struct atag_ramdisk ramdisk;
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struct atag_initrd2 initrd2;
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struct atag_serialnr serialnr;
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struct atag_revision revision;
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struct atag_videolfb videolfb;
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struct atag_cmdline cmdline;
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} u;
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};
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*/
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#endif // __ARCH_ARM_LINUX_ATAG_HH__
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