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2 * linux/arch/arm/kernel/atags_compat.c
4 * Copyright (C) 2001 Russell King
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.
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.
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.
18 #include <linux/types.h>
19 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/init.h>
23 #include <asm/setup.h>
24 #include <asm/mach-types.h>
27 #include <asm/mach/arch.h>
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()
40 * This is the old deprecated way to pass parameters to the kernel
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
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 */
78 char n
[1024 - sizeof(unsigned long)];
81 char commandline
[COMMAND_LINE_SIZE
];
84 static struct tag
* __init
memtag(struct tag
*tag
, unsigned long start
, unsigned long size
)
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
;
95 static void __init
build_tag_list(struct param_struct
*params
, void *taglist
)
97 struct tag
*tag
= taglist
;
99 if (params
->u1
.s
.page_size
!= PAGE_SIZE
) {
100 pr_warn("Warning: bad configuration page, trying to continue\n");
104 printk(KERN_DEBUG
"Converting old-style param struct to taglist\n");
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");
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;
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
;
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
;
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
;
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
;
149 tag
->hdr
.tag
= ATAG_REVISION
;
150 tag
->hdr
.size
= tag_size(tag_revision
);
151 tag
->u
.revision
.rev
= params
->u1
.s
.system_rev
;
153 #ifdef CONFIG_ARCH_ACORN
154 if (machine_is_riscpc()) {
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
);
161 tag
= memtag(tag
, PHYS_OFFSET
, params
->u1
.s
.nr_pages
* PAGE_SIZE
);
163 #ifdef CONFIG_FOOTBRIDGE
164 if (params
->u1
.s
.mem_fclk_21285
) {
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
;
172 #ifdef CONFIG_ARCH_EBSA285
173 if (machine_is_ebsa285()) {
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;
189 #ifdef CONFIG_ARCH_ACORN
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
;
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
);
206 tag
->hdr
.tag
= ATAG_NONE
;
209 memmove(params
, taglist
, ((int)tag
) - ((int)taglist
) +
210 sizeof(struct tag_header
));
213 void __init
convert_to_tag_list(struct tag
*tags
)
215 struct param_struct
*params
= (struct param_struct
*)tags
;
216 build_tag_list(params
, ¶ms
->u2
);