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Linux/arch/arm/kernel/atags_compat.c

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  1 /*
  2  *  linux/arch/arm/kernel/atags_compat.c
  3  *
  4  *  Copyright (C) 2001 Russell King
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  *
 10  * We keep the old params compatibility cruft in one place (here)
 11  * so we don't end up with lots of mess around other places.
 12  *
 13  * NOTE:
 14  *  The old struct param_struct is deprecated, but it will be kept in
 15  *  the kernel for 5 years from now (2001). This will allow boot loaders
 16  *  to convert to the new struct tag way.
 17  */
 18 #include <linux/types.h>
 19 #include <linux/kernel.h>
 20 #include <linux/string.h>
 21 #include <linux/init.h>
 22 
 23 #include <asm/setup.h>
 24 #include <asm/mach-types.h>
 25 #include <asm/page.h>
 26 
 27 #include <asm/mach/arch.h>
 28 
 29 #include "atags.h"
 30 
 31 /*
 32  * Usage:
 33  *  - do not go blindly adding fields, add them at the end
 34  *  - when adding fields, don't rely on the address until
 35  *    a patch from me has been released
 36  *  - unused fields should be zero (for future expansion)
 37  *  - this structure is relatively short-lived - only
 38  *    guaranteed to contain useful data in setup_arch()
 39  *
 40  * This is the old deprecated way to pass parameters to the kernel
 41  */
 42 struct param_struct {
 43     union {
 44         struct {
 45             unsigned long page_size;            /*  0 */
 46             unsigned long nr_pages;             /*  4 */
 47             unsigned long ramdisk_size;         /*  8 */
 48             unsigned long flags;                /* 12 */
 49 #define FLAG_READONLY   1
 50 #define FLAG_RDLOAD     4
 51 #define FLAG_RDPROMPT   8
 52             unsigned long rootdev;              /* 16 */
 53             unsigned long video_num_cols;       /* 20 */
 54             unsigned long video_num_rows;       /* 24 */
 55             unsigned long video_x;              /* 28 */
 56             unsigned long video_y;              /* 32 */
 57             unsigned long memc_control_reg;     /* 36 */
 58             unsigned char sounddefault;         /* 40 */
 59             unsigned char adfsdrives;           /* 41 */
 60             unsigned char bytes_per_char_h;     /* 42 */
 61             unsigned char bytes_per_char_v;     /* 43 */
 62             unsigned long pages_in_bank[4];     /* 44 */
 63             unsigned long pages_in_vram;        /* 60 */
 64             unsigned long initrd_start;         /* 64 */
 65             unsigned long initrd_size;          /* 68 */
 66             unsigned long rd_start;             /* 72 */
 67             unsigned long system_rev;           /* 76 */
 68             unsigned long system_serial_low;    /* 80 */
 69             unsigned long system_serial_high;   /* 84 */
 70             unsigned long mem_fclk_21285;       /* 88 */
 71         } s;
 72         char unused[256];
 73     } u1;
 74     union {
 75         char paths[8][128];
 76         struct {
 77             unsigned long magic;
 78             char n[1024 - sizeof(unsigned long)];
 79         } s;
 80     } u2;
 81     char commandline[COMMAND_LINE_SIZE];
 82 };
 83 
 84 static struct tag * __init memtag(struct tag *tag, unsigned long start, unsigned long size)
 85 {
 86         tag = tag_next(tag);
 87         tag->hdr.tag = ATAG_MEM;
 88         tag->hdr.size = tag_size(tag_mem32);
 89         tag->u.mem.size = size;
 90         tag->u.mem.start = start;
 91 
 92         return tag;
 93 }
 94 
 95 static void __init build_tag_list(struct param_struct *params, void *taglist)
 96 {
 97         struct tag *tag = taglist;
 98 
 99         if (params->u1.s.page_size != PAGE_SIZE) {
100                 pr_warn("Warning: bad configuration page, trying to continue\n");
101                 return;
102         }
103 
104         printk(KERN_DEBUG "Converting old-style param struct to taglist\n");
105 
106 #ifdef CONFIG_ARCH_NETWINDER
107         if (params->u1.s.nr_pages != 0x02000 &&
108             params->u1.s.nr_pages != 0x04000 &&
109             params->u1.s.nr_pages != 0x08000 &&
110             params->u1.s.nr_pages != 0x10000) {
111                 pr_warn("Warning: bad NeTTrom parameters detected, using defaults\n");
112 
113                 params->u1.s.nr_pages = 0x1000; /* 16MB */
114                 params->u1.s.ramdisk_size = 0;
115                 params->u1.s.flags = FLAG_READONLY;
116                 params->u1.s.initrd_start = 0;
117                 params->u1.s.initrd_size = 0;
118                 params->u1.s.rd_start = 0;
119         }
120 #endif
121 
122         tag->hdr.tag  = ATAG_CORE;
123         tag->hdr.size = tag_size(tag_core);
124         tag->u.core.flags = params->u1.s.flags & FLAG_READONLY;
125         tag->u.core.pagesize = params->u1.s.page_size;
126         tag->u.core.rootdev = params->u1.s.rootdev;
127 
128         tag = tag_next(tag);
129         tag->hdr.tag = ATAG_RAMDISK;
130         tag->hdr.size = tag_size(tag_ramdisk);
131         tag->u.ramdisk.flags = (params->u1.s.flags & FLAG_RDLOAD ? 1 : 0) |
132                                (params->u1.s.flags & FLAG_RDPROMPT ? 2 : 0);
133         tag->u.ramdisk.size  = params->u1.s.ramdisk_size;
134         tag->u.ramdisk.start = params->u1.s.rd_start;
135 
136         tag = tag_next(tag);
137         tag->hdr.tag = ATAG_INITRD;
138         tag->hdr.size = tag_size(tag_initrd);
139         tag->u.initrd.start = params->u1.s.initrd_start;
140         tag->u.initrd.size  = params->u1.s.initrd_size;
141 
142         tag = tag_next(tag);
143         tag->hdr.tag = ATAG_SERIAL;
144         tag->hdr.size = tag_size(tag_serialnr);
145         tag->u.serialnr.low = params->u1.s.system_serial_low;
146         tag->u.serialnr.high = params->u1.s.system_serial_high;
147 
148         tag = tag_next(tag);
149         tag->hdr.tag = ATAG_REVISION;
150         tag->hdr.size = tag_size(tag_revision);
151         tag->u.revision.rev = params->u1.s.system_rev;
152 
153 #ifdef CONFIG_ARCH_ACORN
154         if (machine_is_riscpc()) {
155                 int i;
156                 for (i = 0; i < 4; i++)
157                         tag = memtag(tag, PHYS_OFFSET + (i << 26),
158                                  params->u1.s.pages_in_bank[i] * PAGE_SIZE);
159         } else
160 #endif
161         tag = memtag(tag, PHYS_OFFSET, params->u1.s.nr_pages * PAGE_SIZE);
162 
163 #ifdef CONFIG_FOOTBRIDGE
164         if (params->u1.s.mem_fclk_21285) {
165                 tag = tag_next(tag);
166                 tag->hdr.tag = ATAG_MEMCLK;
167                 tag->hdr.size = tag_size(tag_memclk);
168                 tag->u.memclk.fmemclk = params->u1.s.mem_fclk_21285;
169         }
170 #endif
171 
172 #ifdef CONFIG_ARCH_EBSA285
173         if (machine_is_ebsa285()) {
174                 tag = tag_next(tag);
175                 tag->hdr.tag = ATAG_VIDEOTEXT;
176                 tag->hdr.size = tag_size(tag_videotext);
177                 tag->u.videotext.x            = params->u1.s.video_x;
178                 tag->u.videotext.y            = params->u1.s.video_y;
179                 tag->u.videotext.video_page   = 0;
180                 tag->u.videotext.video_mode   = 0;
181                 tag->u.videotext.video_cols   = params->u1.s.video_num_cols;
182                 tag->u.videotext.video_ega_bx = 0;
183                 tag->u.videotext.video_lines  = params->u1.s.video_num_rows;
184                 tag->u.videotext.video_isvga  = 1;
185                 tag->u.videotext.video_points = 8;
186         }
187 #endif
188 
189 #ifdef CONFIG_ARCH_ACORN
190         tag = tag_next(tag);
191         tag->hdr.tag = ATAG_ACORN;
192         tag->hdr.size = tag_size(tag_acorn);
193         tag->u.acorn.memc_control_reg = params->u1.s.memc_control_reg;
194         tag->u.acorn.vram_pages       = params->u1.s.pages_in_vram;
195         tag->u.acorn.sounddefault     = params->u1.s.sounddefault;
196         tag->u.acorn.adfsdrives       = params->u1.s.adfsdrives;
197 #endif
198 
199         tag = tag_next(tag);
200         tag->hdr.tag = ATAG_CMDLINE;
201         tag->hdr.size = (strlen(params->commandline) + 3 +
202                          sizeof(struct tag_header)) >> 2;
203         strcpy(tag->u.cmdline.cmdline, params->commandline);
204 
205         tag = tag_next(tag);
206         tag->hdr.tag = ATAG_NONE;
207         tag->hdr.size = 0;
208 
209         memmove(params, taglist, ((int)tag) - ((int)taglist) +
210                                  sizeof(struct tag_header));
211 }
212 
213 void __init convert_to_tag_list(struct tag *tags)
214 {
215         struct param_struct *params = (struct param_struct *)tags;
216         build_tag_list(params, &params->u2);
217 }
218 

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