/* * linux/arch/arm26/kernel/compat.c * * Copyright (C) 2001 Russell King * 2003 Ian Molton * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * We keep the old params compatibility cruft in one place (here) * so we don't end up with lots of mess around other places. * * NOTE: * The old struct param_struct is deprecated, but it will be kept in * the kernel for 5 years from now (2001). This will allow boot loaders * to convert to the new struct tag way. */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/init.h> #include <asm/setup.h> #include <asm/mach-types.h> #include <asm/page.h> //#include <asm/arch.h> //#include <asm/mach/irq.h> /* * Usage: * - do not go blindly adding fields, add them at the end * - when adding fields, don't rely on the address until * a patch from me has been released * - unused fields should be zero (for future expansion) * - this structure is relatively short-lived - only * guaranteed to contain useful data in setup_arch() * * This is the old deprecated way to pass parameters to the kernel */ struct param_struct { union { struct { unsigned long page_size; /* 0 */ unsigned long nr_pages; /* 4 */ unsigned long ramdisk_size; /* 8 */ unsigned long flags; /* 12 */ #define FLAG_READONLY 1 #define FLAG_RDLOAD 4 #define FLAG_RDPROMPT 8 unsigned long rootdev; /* 16 */ unsigned long video_num_cols; /* 20 */ unsigned long video_num_rows; /* 24 */ unsigned long video_x; /* 28 */ unsigned long video_y; /* 32 */ unsigned long memc_control_reg; /* 36 */ unsigned char sounddefault; /* 40 */ unsigned char adfsdrives; /* 41 */ unsigned char bytes_per_char_h; /* 42 */ unsigned char bytes_per_char_v; /* 43 */ unsigned long pages_in_bank[4]; /* 44 */ unsigned long pages_in_vram; /* 60 */ unsigned long initrd_start; /* 64 */ unsigned long initrd_size; /* 68 */ unsigned long rd_start; /* 72 */ unsigned long system_rev; /* 76 */ unsigned long system_serial_low; /* 80 */ unsigned long system_serial_high; /* 84 */ unsigned long mem_fclk_21285; /* 88 */ } s; char unused[256]; } u1; union { char paths[8][128]; struct { unsigned long magic; char n[1024 - sizeof(unsigned long)]; } s; } u2; char commandline[COMMAND_LINE_SIZE]; }; static struct tag * __init memtag(struct tag *tag, unsigned long start, unsigned long size) { tag = tag_next(tag); tag->hdr.tag = ATAG_MEM; tag->hdr.size = tag_size(tag_mem32); tag->u.mem.size = size; tag->u.mem.start = start; return tag; } static void __init build_tag_list(struct param_struct *params, void *taglist) { struct tag *tag = taglist; if (params->u1.s.page_size != PAGE_SIZE) { printk(KERN_WARNING "Warning: bad configuration page, " "trying to continue\n"); return; } printk(KERN_DEBUG "Converting old-style param struct to taglist\n"); tag->hdr.tag = ATAG_CORE; tag->hdr.size = tag_size(tag_core); tag->u.core.flags = params->u1.s.flags & FLAG_READONLY; tag->u.core.pagesize = params->u1.s.page_size; tag->u.core.rootdev = params->u1.s.rootdev; tag = tag_next(tag); tag->hdr.tag = ATAG_RAMDISK; tag->hdr.size = tag_size(tag_ramdisk); tag->u.ramdisk.flags = (params->u1.s.flags & FLAG_RDLOAD ? 1 : 0) | (params->u1.s.flags & FLAG_RDPROMPT ? 2 : 0); tag->u.ramdisk.size = params->u1.s.ramdisk_size; tag->u.ramdisk.start = params->u1.s.rd_start; tag = tag_next(tag); tag->hdr.tag = ATAG_INITRD; tag->hdr.size = tag_size(tag_initrd); tag->u.initrd.start = params->u1.s.initrd_start; tag->u.initrd.size = params->u1.s.initrd_size; tag = tag_next(tag); tag->hdr.tag = ATAG_SERIAL; tag->hdr.size = tag_size(tag_serialnr); tag->u.serialnr.low = params->u1.s.system_serial_low; tag->u.serialnr.high = params->u1.s.system_serial_high; tag = tag_next(tag); tag->hdr.tag = ATAG_REVISION; tag->hdr.size = tag_size(tag_revision); tag->u.revision.rev = params->u1.s.system_rev; tag = memtag(tag, PHYS_OFFSET, params->u1.s.nr_pages * PAGE_SIZE); tag = tag_next(tag); tag->hdr.tag = ATAG_ACORN; tag->hdr.size = tag_size(tag_acorn); tag->u.acorn.memc_control_reg = params->u1.s.memc_control_reg; tag->u.acorn.vram_pages = params->u1.s.pages_in_vram; tag->u.acorn.sounddefault = params->u1.s.sounddefault; tag->u.acorn.adfsdrives = params->u1.s.adfsdrives; tag = tag_next(tag); tag->hdr.tag = ATAG_CMDLINE; tag->hdr.size = (strlen(params->commandline) + 3 + sizeof(struct tag_header)) >> 2; strcpy(tag->u.cmdline.cmdline, params->commandline); tag = tag_next(tag); tag->hdr.tag = ATAG_NONE; tag->hdr.size = 0; memmove(params, taglist, ((int)tag) - ((int)taglist) + sizeof(struct tag_header)); } void __init convert_to_tag_list(struct tag *tags) { struct param_struct *params = (struct param_struct *)tags; build_tag_list(params, ¶ms->u2); } void __init squash_mem_tags(struct tag *tag) { for (; tag->hdr.size; tag = tag_next(tag)) if (tag->hdr.tag == ATAG_MEM) tag->hdr.tag = ATAG_NONE; }