1/*
2 *  linux/include/asm/setup.h
3 *
4 *  Copyright (C) 1997-1999 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 *  Structure passed to kernel to tell it about the
11 *  hardware it's running on.  See linux/Documentation/arm/Setup
12 *  for more info.
13 *
14 * NOTE:
15 *  This file contains two ways to pass information from the boot
16 *  loader to the kernel. The old struct param_struct is deprecated,
17 *  but it will be kept in the kernel for 5 years from now
18 *  (2001). This will allow boot loaders to convert to the new struct
19 *  tag way.
20 */
21#ifndef __ASMARM_SETUP_H
22#define __ASMARM_SETUP_H
23
24/*
25 * Usage:
26 *  - do not go blindly adding fields, add them at the end
27 *  - when adding fields, don't rely on the address until
28 *    a patch from me has been released
29 *  - unused fields should be zero (for future expansion)
30 *  - this structure is relatively short-lived - only
31 *    guaranteed to contain useful data in setup_arch()
32 */
33#define COMMAND_LINE_SIZE 1024
34
35/* This is the old deprecated way to pass parameters to the kernel */
36struct param_struct {
37    union {
38	struct {
39	    unsigned long page_size;		/*  0 */
40	    unsigned long nr_pages;		/*  4 */
41	    unsigned long ramdisk_size;		/*  8 */
42	    unsigned long flags;		/* 12 */
43#define FLAG_READONLY	1
44#define FLAG_RDLOAD	4
45#define FLAG_RDPROMPT	8
46	    unsigned long rootdev;		/* 16 */
47	    unsigned long video_num_cols;	/* 20 */
48	    unsigned long video_num_rows;	/* 24 */
49	    unsigned long video_x;		/* 28 */
50	    unsigned long video_y;		/* 32 */
51	    unsigned long memc_control_reg;	/* 36 */
52	    unsigned char sounddefault;		/* 40 */
53	    unsigned char adfsdrives;		/* 41 */
54	    unsigned char bytes_per_char_h;	/* 42 */
55	    unsigned char bytes_per_char_v;	/* 43 */
56	    unsigned long pages_in_bank[4];	/* 44 */
57	    unsigned long pages_in_vram;	/* 60 */
58	    unsigned long initrd_start;		/* 64 */
59	    unsigned long initrd_size;		/* 68 */
60	    unsigned long rd_start;		/* 72 */
61	    unsigned long system_rev;		/* 76 */
62	    unsigned long system_serial_low;	/* 80 */
63	    unsigned long system_serial_high;	/* 84 */
64	    unsigned long mem_fclk_21285;       /* 88 */
65	} s;
66	char unused[256];
67    } u1;
68    union {
69	char paths[8][128];
70	struct {
71	    unsigned long magic;
72	    char n[1024 - sizeof(unsigned long)];
73	} s;
74    } u2;
75    char commandline[COMMAND_LINE_SIZE];
76};
77
78
79/*
80 * The new way of passing information: a list of tagged entries
81 */
82
83/* The list ends with an ATAG_NONE node. */
84#define ATAG_NONE	0x00000000
85
86struct tag_header {
87	u32 size;
88	u32 tag;
89};
90
91/* The list must start with an ATAG_CORE node */
92#define ATAG_CORE	0x54410001
93
94struct tag_core {
95	u32 flags;		/* bit 0 = read-only */
96	u32 pagesize;
97	u32 rootdev;
98};
99
100/* it is allowed to have multiple ATAG_MEM nodes */
101#define ATAG_MEM	0x54410002
102
103struct tag_mem32 {
104	u32	size;
105	u32	start;	/* physical start address */
106};
107
108/* VGA text type displays */
109#define ATAG_VIDEOTEXT	0x54410003
110
111struct tag_videotext {
112	u8		x;
113	u8		y;
114	u16		video_page;
115	u8		video_mode;
116	u8		video_cols;
117	u16		video_ega_bx;
118	u8		video_lines;
119	u8		video_isvga;
120	u16		video_points;
121};
122
123/* describes how the ramdisk will be used in kernel */
124#define ATAG_RAMDISK	0x54410004
125
126struct tag_ramdisk {
127	u32 flags;	/* bit 0 = load, bit 1 = prompt */
128	u32 size;	/* decompressed ramdisk size in _kilo_ bytes */
129	u32 start;	/* starting block of floppy-based RAM disk image */
130};
131
132/* describes where the compressed ramdisk image lives (virtual address) */
133/*
134 * this one accidentally used virtual addresses - as such,
135 * it's deprecated.
136 */
137#define ATAG_INITRD	0x54410005
138
139/* describes where the compressed ramdisk image lives (physical address) */
140#define ATAG_INITRD2	0x54420005
141
142struct tag_initrd {
143	u32 start;	/* physical start address */
144	u32 size;	/* size of compressed ramdisk image in bytes */
145};
146
147/* board serial number. "64 bits should be enough for everybody" */
148#define ATAG_SERIAL	0x54410006
149
150struct tag_serialnr {
151	u32 low;
152	u32 high;
153};
154
155/* board revision */
156#define ATAG_REVISION	0x54410007
157
158struct tag_revision {
159	u32 rev;
160};
161
162/* initial values for vesafb-type framebuffers. see struct screen_info
163 * in include/linux/tty.h
164 */
165#define ATAG_VIDEOLFB	0x54410008
166
167struct tag_videolfb {
168	u16		lfb_width;
169	u16		lfb_height;
170	u16		lfb_depth;
171	u16		lfb_linelength;
172	u32		lfb_base;
173	u32		lfb_size;
174	u8		red_size;
175	u8		red_pos;
176	u8		green_size;
177	u8		green_pos;
178	u8		blue_size;
179	u8		blue_pos;
180	u8		rsvd_size;
181	u8		rsvd_pos;
182};
183
184/* command line: \0 terminated string */
185#define ATAG_CMDLINE	0x54410009
186
187struct tag_cmdline {
188	char	cmdline[1];	/* this is the minimum size */
189};
190
191/* acorn RiscPC specific information */
192#define ATAG_ACORN	0x41000101
193
194struct tag_acorn {
195	u32 memc_control_reg;
196	u32 vram_pages;
197	u8 sounddefault;
198	u8 adfsdrives;
199};
200
201/* footbridge memory clock, see arch/arm/mach-footbridge/arch.c */
202#define ATAG_MEMCLK	0x41000402
203
204struct tag_memclk {
205	u32 fmemclk;
206};
207
208struct tag {
209	struct tag_header hdr;
210	union {
211		struct tag_core		core;
212		struct tag_mem32	mem;
213		struct tag_videotext	videotext;
214		struct tag_ramdisk	ramdisk;
215		struct tag_initrd	initrd;
216		struct tag_serialnr	serialnr;
217		struct tag_revision	revision;
218		struct tag_videolfb	videolfb;
219		struct tag_cmdline	cmdline;
220
221		/*
222		 * Acorn specific
223		 */
224		struct tag_acorn	acorn;
225
226		/*
227		 * DC21285 specific
228		 */
229		struct tag_memclk	memclk;
230	} u;
231};
232
233struct tagtable {
234	u32 tag;
235	int (*parse)(const struct tag *);
236};
237
238#define __tag __attribute__((unused)) __section(".taglist")
239#define __tagtable(tag, fn) \
240static struct tagtable __tagtable_##fn __tag = { tag, fn }
241
242#define tag_member_present(tag,member)				\
243	((unsigned long)(&((struct tag *)0L)->member + 1)	\
244		<= (tag)->hdr.size * 4)
245
246#define tag_next(t)	((struct tag *)((u32 *)(t) + (t)->hdr.size))
247#define tag_size(type)	((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
248
249#define for_each_tag(t,base)		\
250	for (t = base; t->hdr.size; t = tag_next(t))
251
252/*
253 * Memory map description
254 */
255#define NR_BANKS 8
256
257struct meminfo {
258	int nr_banks;
259	unsigned long end;
260	struct {
261		unsigned long start;
262		unsigned long size;
263		int           node;
264	} bank[NR_BANKS];
265};
266
267extern struct meminfo meminfo;
268
269#endif
270
271/*
272 * Board specified tags
273 */
274void setup_board_tags(struct tag **in_params);
275