124 lines
3.3 KiB
C
124 lines
3.3 KiB
C
/*
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* Copyright (C) 2001-2003 Hewlett-Packard Co.
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* Contributed by Stephane Eranian <eranian@hpl.hp.com>
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*
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* This file is part of the ELILO, the EFI Linux boot loader.
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*
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* ELILO is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* ELILO is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with ELILO; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*
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* Please check out the elilo.txt for complete documentation on how
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* to use this program.
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*/
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#include <efi.h>
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#include <efilib.h>
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#include "elilo.h"
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/*
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* Initialize the generic part of the boot parameters and call the architecture specific
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* subroutine.
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* Output:
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* cookie: the memory map cookie to use with ExitBootServices()
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* Return:
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* NULL: if an error occured
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* bp : the address of the bootparams otherwise (opaque type)
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*/
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VOID *
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create_boot_params(CHAR16 *args, memdesc_t *initrd, memdesc_t *vmcode, UINTN *cookie)
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{
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/*
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* XXX: need cleanup
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* See ia32 code for explanation on why it is so big.
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*/
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#define BOOT_PARAM_MEMSIZE 16384
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UINTN bpsize, cmdline_size;
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boot_params_t *bp;
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CHAR8 *cp;
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CHAR16 ch;
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/*
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* Allocate runtime services memory to hold memory descriptor table and
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* command line arguments and fetch memory map:
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*
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* arg_size = number of character in ASCII form
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*/
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cmdline_size = StrLen(args) + 1;
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bpsize = sizeof(boot_params_t) + cmdline_size;
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if (bpsize > BOOT_PARAM_MEMSIZE) {
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ERR_PRT((L"BOOT_PARAM_MEMSIZE too small, need at least %d bytes", bpsize));
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return NULL;
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}
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/*
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* Allocate memory for boot parameters.
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*/
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bp = (boot_params_t *)alloc(BOOT_PARAM_MEMSIZE, EfiLoaderData);
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if (bp == NULL) {
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ERR_PRT((L"can't allocate boot params"));
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return 0;
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}
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VERB_PRT(3, Print(L"boot params @ " PTR_FMT "\n", bp));
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/* XXX: need to fix this for 3.5 */
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#ifdef CONFIG_ia64
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cp = ((CHAR8 *)bp) + BOOT_PARAM_MEMSIZE - cmdline_size;
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#elif defined CONFIG_ia32 || CONFIG_x86_64
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cp = ((CHAR8 *)bp) + BOOT_PARAM_MEMSIZE - 2048;
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#endif
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/*
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* clear entire buffer. The boot param structure is bigger than
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* needs be but this allows the kernel bootparam structure to grow
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* (up to BOOT_PARAM_MEMSIZE) without having to worry about fixing the bootloader.
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* By convention between the laoder and the kernel, the value 0 means
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* don't care or not set.
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*/
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Memset(bp, 0, BOOT_PARAM_MEMSIZE);
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U2ascii(args, cp, cmdline_size);
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if (sysdeps_create_boot_params(bp, cp, initrd, vmcode, cookie) == -1) return 0;
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/*
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* Convert kernel command line args from UNICODE to ASCII and put them where
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* the kernel expects them:
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*/
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while (1) {
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ch = *args++;
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if (!ch) break;
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*cp++ = ch;
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}
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*cp++ = '\0';
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return bp;
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}
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VOID
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free_boot_params(VOID *bp)
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{
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boot_params_t *real_bp = (boot_params_t *)bp;
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sysdeps_free_boot_params(real_bp);
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free(real_bp);
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}
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