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arm
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setup.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* * linux/include/asm/setup.h * * Copyright (C) 1997-1999 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Structure passed to kernel to tell it about the * hardware it's running on. See Documentation/arch/arm/setup.rst * for more info. */ #ifndef __ASMARM_SETUP_H #define __ASMARM_SETUP_H #include <linux/types.h> #define COMMAND_LINE_SIZE 1024 /* The list ends with an ATAG_NONE node. */ #define ATAG_NONE 0x00000000 struct tag_header { __u32 size; __u32 tag; }; /* The list must start with an ATAG_CORE node */ #define ATAG_CORE 0x54410001 struct tag_core { __u32 flags; /* bit 0 = read-only */ __u32 pagesize; __u32 rootdev; }; /* it is allowed to have multiple ATAG_MEM nodes */ #define ATAG_MEM 0x54410002 struct tag_mem32 { __u32 size; __u32 start; /* physical start address */ }; /* VGA text type displays */ #define ATAG_VIDEOTEXT 0x54410003 struct tag_videotext { __u8 x; __u8 y; __u16 video_page; __u8 video_mode; __u8 video_cols; __u16 video_ega_bx; __u8 video_lines; __u8 video_isvga; __u16 video_points; }; /* describes how the ramdisk will be used in kernel */ #define ATAG_RAMDISK 0x54410004 struct tag_ramdisk { __u32 flags; /* bit 0 = load, bit 1 = prompt */ __u32 size; /* decompressed ramdisk size in _kilo_ bytes */ __u32 start; /* starting block of floppy-based RAM disk image */ }; /* describes where the compressed ramdisk image lives (virtual address) */ /* * this one accidentally used virtual addresses - as such, * it's deprecated. */ #define ATAG_INITRD 0x54410005 /* describes where the compressed ramdisk image lives (physical address) */ #define ATAG_INITRD2 0x54420005 struct tag_initrd { __u32 start; /* physical start address */ __u32 size; /* size of compressed ramdisk image in bytes */ }; /* board serial number. "64 bits should be enough for everybody" */ #define ATAG_SERIAL 0x54410006 struct tag_serialnr { __u32 low; __u32 high; }; /* board revision */ #define ATAG_REVISION 0x54410007 struct tag_revision { __u32 rev; }; /* initial values for vesafb-type framebuffers. see struct screen_info * in include/linux/tty.h */ #define ATAG_VIDEOLFB 0x54410008 struct tag_videolfb { __u16 lfb_width; __u16 lfb_height; __u16 lfb_depth; __u16 lfb_linelength; __u32 lfb_base; __u32 lfb_size; __u8 red_size; __u8 red_pos; __u8 green_size; __u8 green_pos; __u8 blue_size; __u8 blue_pos; __u8 rsvd_size; __u8 rsvd_pos; }; /* command line: \0 terminated string */ #define ATAG_CMDLINE 0x54410009 struct tag_cmdline { char cmdline[1]; /* this is the minimum size */ }; /* acorn RiscPC specific information */ #define ATAG_ACORN 0x41000101 struct tag_acorn { __u32 memc_control_reg; __u32 vram_pages; __u8 sounddefault; __u8 adfsdrives; }; /* footbridge memory clock, see arch/arm/mach-footbridge/arch.c */ #define ATAG_MEMCLK 0x41000402 struct tag_memclk { __u32 fmemclk; }; struct tag { struct tag_header hdr; union { struct tag_core core; struct tag_mem32 mem; struct tag_videotext videotext; struct tag_ramdisk ramdisk; struct tag_initrd initrd; struct tag_serialnr serialnr; struct tag_revision revision; struct tag_videolfb videolfb; struct tag_cmdline cmdline; /* * Acorn specific */ struct tag_acorn acorn; /* * DC21285 specific */ struct tag_memclk memclk; } u; }; struct tagtable { __u32 tag; int (*parse)(const struct tag *); }; #define tag_member_present(tag,member) \ ((unsigned long)(&((struct tag *)0L)->member + 1) \ <= (tag)->hdr.size * 4) #define tag_next(t) ((struct tag *)((__u32 *)(t) + (t)->hdr.size)) #define tag_size(type) ((sizeof(struct tag_header) + sizeof(struct type)) >> 2) #define for_each_tag(t,base) \ for (t = base; t->hdr.size; t = tag_next(t)) #endif /* __ASMARM_SETUP_H */