227 lines
6.6 KiB
C
227 lines
6.6 KiB
C
/*
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* linux/arch/arm/kernel/compat.c
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*
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* Copyright (C) 2001 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* We keep the old params compatibility cruft in one place (here)
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* so we don't end up with lots of mess around other places.
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*
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* NOTE:
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* The old struct param_struct is deprecated, but it will be kept in
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* the kernel for 5 years from now (2001). This will allow boot loaders
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* to convert to the new struct tag way.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <asm/setup.h>
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#include <asm/mach-types.h>
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#include <asm/page.h>
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#include <asm/mach/arch.h>
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#include "compat.h"
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/*
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* Usage:
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* - do not go blindly adding fields, add them at the end
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* - when adding fields, don't rely on the address until
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* a patch from me has been released
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* - unused fields should be zero (for future expansion)
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* - this structure is relatively short-lived - only
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* guaranteed to contain useful data in setup_arch()
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*
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* This is the old deprecated way to pass parameters to the kernel
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*/
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struct param_struct {
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union {
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struct {
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unsigned long page_size; /* 0 */
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unsigned long nr_pages; /* 4 */
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unsigned long ramdisk_size; /* 8 */
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unsigned long flags; /* 12 */
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#define FLAG_READONLY 1
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#define FLAG_RDLOAD 4
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#define FLAG_RDPROMPT 8
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unsigned long rootdev; /* 16 */
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unsigned long video_num_cols; /* 20 */
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unsigned long video_num_rows; /* 24 */
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unsigned long video_x; /* 28 */
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unsigned long video_y; /* 32 */
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unsigned long memc_control_reg; /* 36 */
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unsigned char sounddefault; /* 40 */
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unsigned char adfsdrives; /* 41 */
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unsigned char bytes_per_char_h; /* 42 */
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unsigned char bytes_per_char_v; /* 43 */
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unsigned long pages_in_bank[4]; /* 44 */
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unsigned long pages_in_vram; /* 60 */
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unsigned long initrd_start; /* 64 */
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unsigned long initrd_size; /* 68 */
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unsigned long rd_start; /* 72 */
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unsigned long system_rev; /* 76 */
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unsigned long system_serial_low; /* 80 */
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unsigned long system_serial_high; /* 84 */
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unsigned long mem_fclk_21285; /* 88 */
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} s;
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char unused[256];
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} u1;
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union {
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char paths[8][128];
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struct {
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unsigned long magic;
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char n[1024 - sizeof(unsigned long)];
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} s;
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} u2;
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char commandline[COMMAND_LINE_SIZE];
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};
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static struct tag * __init memtag(struct tag *tag, unsigned long start, unsigned long size)
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{
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tag = tag_next(tag);
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tag->hdr.tag = ATAG_MEM;
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tag->hdr.size = tag_size(tag_mem32);
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tag->u.mem.size = size;
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tag->u.mem.start = start;
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return tag;
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}
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static void __init build_tag_list(struct param_struct *params, void *taglist)
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{
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struct tag *tag = taglist;
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if (params->u1.s.page_size != PAGE_SIZE) {
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printk(KERN_WARNING "Warning: bad configuration page, "
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"trying to continue\n");
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return;
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}
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printk(KERN_DEBUG "Converting old-style param struct to taglist\n");
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#ifdef CONFIG_ARCH_NETWINDER
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if (params->u1.s.nr_pages != 0x02000 &&
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params->u1.s.nr_pages != 0x04000 &&
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params->u1.s.nr_pages != 0x08000 &&
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params->u1.s.nr_pages != 0x10000) {
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printk(KERN_WARNING "Warning: bad NeTTrom parameters "
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"detected, using defaults\n");
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params->u1.s.nr_pages = 0x1000; /* 16MB */
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params->u1.s.ramdisk_size = 0;
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params->u1.s.flags = FLAG_READONLY;
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params->u1.s.initrd_start = 0;
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params->u1.s.initrd_size = 0;
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params->u1.s.rd_start = 0;
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}
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#endif
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tag->hdr.tag = ATAG_CORE;
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tag->hdr.size = tag_size(tag_core);
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tag->u.core.flags = params->u1.s.flags & FLAG_READONLY;
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tag->u.core.pagesize = params->u1.s.page_size;
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tag->u.core.rootdev = params->u1.s.rootdev;
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tag = tag_next(tag);
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tag->hdr.tag = ATAG_RAMDISK;
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tag->hdr.size = tag_size(tag_ramdisk);
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tag->u.ramdisk.flags = (params->u1.s.flags & FLAG_RDLOAD ? 1 : 0) |
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(params->u1.s.flags & FLAG_RDPROMPT ? 2 : 0);
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tag->u.ramdisk.size = params->u1.s.ramdisk_size;
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tag->u.ramdisk.start = params->u1.s.rd_start;
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tag = tag_next(tag);
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tag->hdr.tag = ATAG_INITRD;
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tag->hdr.size = tag_size(tag_initrd);
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tag->u.initrd.start = params->u1.s.initrd_start;
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tag->u.initrd.size = params->u1.s.initrd_size;
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tag = tag_next(tag);
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tag->hdr.tag = ATAG_SERIAL;
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tag->hdr.size = tag_size(tag_serialnr);
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tag->u.serialnr.low = params->u1.s.system_serial_low;
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tag->u.serialnr.high = params->u1.s.system_serial_high;
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tag = tag_next(tag);
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tag->hdr.tag = ATAG_REVISION;
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tag->hdr.size = tag_size(tag_revision);
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tag->u.revision.rev = params->u1.s.system_rev;
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#ifdef CONFIG_ARCH_ACORN
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if (machine_is_riscpc()) {
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int i;
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for (i = 0; i < 4; i++)
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tag = memtag(tag, PHYS_OFFSET + (i << 26),
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params->u1.s.pages_in_bank[i] * PAGE_SIZE);
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} else
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#endif
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tag = memtag(tag, PHYS_OFFSET, params->u1.s.nr_pages * PAGE_SIZE);
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#ifdef CONFIG_FOOTBRIDGE
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if (params->u1.s.mem_fclk_21285) {
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tag = tag_next(tag);
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tag->hdr.tag = ATAG_MEMCLK;
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tag->hdr.size = tag_size(tag_memclk);
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tag->u.memclk.fmemclk = params->u1.s.mem_fclk_21285;
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}
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#endif
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#ifdef CONFIG_ARCH_EBSA285
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if (machine_is_ebsa285()) {
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tag = tag_next(tag);
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tag->hdr.tag = ATAG_VIDEOTEXT;
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tag->hdr.size = tag_size(tag_videotext);
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tag->u.videotext.x = params->u1.s.video_x;
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tag->u.videotext.y = params->u1.s.video_y;
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tag->u.videotext.video_page = 0;
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tag->u.videotext.video_mode = 0;
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tag->u.videotext.video_cols = params->u1.s.video_num_cols;
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tag->u.videotext.video_ega_bx = 0;
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tag->u.videotext.video_lines = params->u1.s.video_num_rows;
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tag->u.videotext.video_isvga = 1;
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tag->u.videotext.video_points = 8;
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}
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#endif
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#ifdef CONFIG_ARCH_ACORN
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tag = tag_next(tag);
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tag->hdr.tag = ATAG_ACORN;
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tag->hdr.size = tag_size(tag_acorn);
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tag->u.acorn.memc_control_reg = params->u1.s.memc_control_reg;
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tag->u.acorn.vram_pages = params->u1.s.pages_in_vram;
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tag->u.acorn.sounddefault = params->u1.s.sounddefault;
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tag->u.acorn.adfsdrives = params->u1.s.adfsdrives;
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#endif
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tag = tag_next(tag);
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tag->hdr.tag = ATAG_CMDLINE;
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tag->hdr.size = (strlen(params->commandline) + 3 +
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sizeof(struct tag_header)) >> 2;
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strcpy(tag->u.cmdline.cmdline, params->commandline);
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tag = tag_next(tag);
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tag->hdr.tag = ATAG_NONE;
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tag->hdr.size = 0;
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memmove(params, taglist, ((int)tag) - ((int)taglist) +
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sizeof(struct tag_header));
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}
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void __init convert_to_tag_list(struct tag *tags)
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{
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struct param_struct *params = (struct param_struct *)tags;
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build_tag_list(params, ¶ms->u2);
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}
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void __init squash_mem_tags(struct tag *tag)
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{
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for (; tag->hdr.size; tag = tag_next(tag))
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if (tag->hdr.tag == ATAG_MEM)
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tag->hdr.tag = ATAG_NONE;
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}
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