arch/arm/kernel/atags

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This source file includes following definitions.
memtag
build_tag_list
convert_to_tag_list
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/arch/arm/kernel/atags_compat.c
   4  *
   5  *  Copyright (C) 2001 Russell King
   6  *
   7  * We keep the old params compatibility cruft in one place (here)
   8  * so we don't end up with lots of mess around other places.
   9  *
  10  * NOTE:
  11  *  The old struct param_struct is deprecated, but it will be kept in
  12  *  the kernel for 5 years from now (2001). This will allow boot loaders
  13  *  to convert to the new struct tag way.
  14  */
  15 #include <linux/types.h>
  16 #include <linux/kernel.h>
  17 #include <linux/string.h>
  18 #include <linux/init.h>
  19 
  20 #include <asm/setup.h>
  21 #include <asm/mach-types.h>
  22 #include <asm/page.h>
  23 
  24 #include <asm/mach/arch.h>
  25 
  26 #include "atags.h"
  27 
  28 /*
  29  * Usage:
  30  *  - do not go blindly adding fields, add them at the end
  31  *  - when adding fields, don't rely on the address until
  32  *    a patch from me has been released
  33  *  - unused fields should be zero (for future expansion)
  34  *  - this structure is relatively short-lived - only
  35  *    guaranteed to contain useful data in setup_arch()
  36  *
  37  * This is the old deprecated way to pass parameters to the kernel
  38  */
  39 struct param_struct {
  40     union {
  41         struct {
  42             unsigned long page_size;            /*  0 */
  43             unsigned long nr_pages;             /*  4 */
  44             unsigned long ramdisk_size;         /*  8 */
  45             unsigned long flags;                /* 12 */
  46 #define FLAG_READONLY   1
  47 #define FLAG_RDLOAD     4
  48 #define FLAG_RDPROMPT   8
  49             unsigned long rootdev;              /* 16 */
  50             unsigned long video_num_cols;       /* 20 */
  51             unsigned long video_num_rows;       /* 24 */
  52             unsigned long video_x;              /* 28 */
  53             unsigned long video_y;              /* 32 */
  54             unsigned long memc_control_reg;     /* 36 */
  55             unsigned char sounddefault;         /* 40 */
  56             unsigned char adfsdrives;           /* 41 */
  57             unsigned char bytes_per_char_h;     /* 42 */
  58             unsigned char bytes_per_char_v;     /* 43 */
  59             unsigned long pages_in_bank[4];     /* 44 */
  60             unsigned long pages_in_vram;        /* 60 */
  61             unsigned long initrd_start;         /* 64 */
  62             unsigned long initrd_size;          /* 68 */
  63             unsigned long rd_start;             /* 72 */
  64             unsigned long system_rev;           /* 76 */
  65             unsigned long system_serial_low;    /* 80 */
  66             unsigned long system_serial_high;   /* 84 */
  67             unsigned long mem_fclk_21285;       /* 88 */
  68         } s;
  69         char unused[256];
  70     } u1;
  71     union {
  72         char paths[8][128];
  73         struct {
  74             unsigned long magic;
  75             char n[1024 - sizeof(unsigned long)];
  76         } s;
  77     } u2;
  78     char commandline[COMMAND_LINE_SIZE];
  79 };
  80 
  81 static struct tag * __init memtag(struct tag *tag, unsigned long start, unsigned long size)
  82 {
  83         tag = tag_next(tag);
  84         tag->hdr.tag = ATAG_MEM;
  85         tag->hdr.size = tag_size(tag_mem32);
  86         tag->u.mem.size = size;
  87         tag->u.mem.start = start;
  88 
  89         return tag;
  90 }
  91 
  92 static void __init build_tag_list(struct param_struct *params, void *taglist)
  93 {
  94         struct tag *tag = taglist;
  95 
  96         if (params->u1.s.page_size != PAGE_SIZE) {
  97                 pr_warn("Warning: bad configuration page, trying to continue\n");
  98                 return;
  99         }
 100 
 101         printk(KERN_DEBUG "Converting old-style param struct to taglist\n");
 102 
 103 #ifdef CONFIG_ARCH_NETWINDER
 104         if (params->u1.s.nr_pages != 0x02000 &&
 105             params->u1.s.nr_pages != 0x04000 &&
 106             params->u1.s.nr_pages != 0x08000 &&
 107             params->u1.s.nr_pages != 0x10000) {
 108                 pr_warn("Warning: bad NeTTrom parameters detected, using defaults\n");
 109 
 110                 params->u1.s.nr_pages = 0x1000; /* 16MB */
 111                 params->u1.s.ramdisk_size = 0;
 112                 params->u1.s.flags = FLAG_READONLY;
 113                 params->u1.s.initrd_start = 0;
 114                 params->u1.s.initrd_size = 0;
 115                 params->u1.s.rd_start = 0;
 116         }
 117 #endif
 118 
 119         tag->hdr.tag  = ATAG_CORE;
 120         tag->hdr.size = tag_size(tag_core);
 121         tag->u.core.flags = params->u1.s.flags & FLAG_READONLY;
 122         tag->u.core.pagesize = params->u1.s.page_size;
 123         tag->u.core.rootdev = params->u1.s.rootdev;
 124 
 125         tag = tag_next(tag);
 126         tag->hdr.tag = ATAG_RAMDISK;
 127         tag->hdr.size = tag_size(tag_ramdisk);
 128         tag->u.ramdisk.flags = (params->u1.s.flags & FLAG_RDLOAD ? 1 : 0) |
 129                                (params->u1.s.flags & FLAG_RDPROMPT ? 2 : 0);
 130         tag->u.ramdisk.size  = params->u1.s.ramdisk_size;
 131         tag->u.ramdisk.start = params->u1.s.rd_start;
 132 
 133         tag = tag_next(tag);
 134         tag->hdr.tag = ATAG_INITRD;
 135         tag->hdr.size = tag_size(tag_initrd);
 136         tag->u.initrd.start = params->u1.s.initrd_start;
 137         tag->u.initrd.size  = params->u1.s.initrd_size;
 138 
 139         tag = tag_next(tag);
 140         tag->hdr.tag = ATAG_SERIAL;
 141         tag->hdr.size = tag_size(tag_serialnr);
 142         tag->u.serialnr.low = params->u1.s.system_serial_low;
 143         tag->u.serialnr.high = params->u1.s.system_serial_high;
 144 
 145         tag = tag_next(tag);
 146         tag->hdr.tag = ATAG_REVISION;
 147         tag->hdr.size = tag_size(tag_revision);
 148         tag->u.revision.rev = params->u1.s.system_rev;
 149 
 150 #ifdef CONFIG_ARCH_ACORN
 151         if (machine_is_riscpc()) {
 152                 int i;
 153                 for (i = 0; i < 4; i++)
 154                         tag = memtag(tag, PHYS_OFFSET + (i << 26),
 155                                  params->u1.s.pages_in_bank[i] * PAGE_SIZE);
 156         } else
 157 #endif
 158         tag = memtag(tag, PHYS_OFFSET, params->u1.s.nr_pages * PAGE_SIZE);
 159 
 160 #ifdef CONFIG_FOOTBRIDGE
 161         if (params->u1.s.mem_fclk_21285) {
 162                 tag = tag_next(tag);
 163                 tag->hdr.tag = ATAG_MEMCLK;
 164                 tag->hdr.size = tag_size(tag_memclk);
 165                 tag->u.memclk.fmemclk = params->u1.s.mem_fclk_21285;
 166         }
 167 #endif
 168 
 169 #ifdef CONFIG_ARCH_EBSA285
 170         if (machine_is_ebsa285()) {
 171                 tag = tag_next(tag);
 172                 tag->hdr.tag = ATAG_VIDEOTEXT;
 173                 tag->hdr.size = tag_size(tag_videotext);
 174                 tag->u.videotext.x            = params->u1.s.video_x;
 175                 tag->u.videotext.y            = params->u1.s.video_y;
 176                 tag->u.videotext.video_page   = 0;
 177                 tag->u.videotext.video_mode   = 0;
 178                 tag->u.videotext.video_cols   = params->u1.s.video_num_cols;
 179                 tag->u.videotext.video_ega_bx = 0;
 180                 tag->u.videotext.video_lines  = params->u1.s.video_num_rows;
 181                 tag->u.videotext.video_isvga  = 1;
 182                 tag->u.videotext.video_points = 8;
 183         }
 184 #endif
 185 
 186 #ifdef CONFIG_ARCH_ACORN
 187         tag = tag_next(tag);
 188         tag->hdr.tag = ATAG_ACORN;
 189         tag->hdr.size = tag_size(tag_acorn);
 190         tag->u.acorn.memc_control_reg = params->u1.s.memc_control_reg;
 191         tag->u.acorn.vram_pages       = params->u1.s.pages_in_vram;
 192         tag->u.acorn.sounddefault     = params->u1.s.sounddefault;
 193         tag->u.acorn.adfsdrives       = params->u1.s.adfsdrives;
 194 #endif
 195 
 196         tag = tag_next(tag);
 197         tag->hdr.tag = ATAG_CMDLINE;
 198         tag->hdr.size = (strlen(params->commandline) + 3 +
 199                          sizeof(struct tag_header)) >> 2;
 200         strcpy(tag->u.cmdline.cmdline, params->commandline);
 201 
 202         tag = tag_next(tag);
 203         tag->hdr.tag = ATAG_NONE;
 204         tag->hdr.size = 0;
 205 
 206         memmove(params, taglist, ((int)tag) - ((int)taglist) +
 207                                  sizeof(struct tag_header));
 208 }
 209 
 210 void __init convert_to_tag_list(struct tag *tags)
 211 {
 212         struct param_struct *params = (struct param_struct *)tags;
 213         build_tag_list(params, &params->u2);
 214 }
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root/arch/arm/kernel/atags_compat.c

DEFINITIONS
