136 lines
3.9 KiB
C
136 lines
3.9 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB 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 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/normal.h>
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#include <grub/dl.h>
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#include <grub/file.h>
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#include <grub/disk.h>
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#include <grub/misc.h>
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#include <grub/xnu.h>
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#include <grub/cpu/xnu.h>
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#include <grub/mm.h>
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#include <grub/loader.h>
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static void *grub_xnu_hibernate_image;
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static grub_err_t
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grub_xnu_resume_unload (void)
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{
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/* Free loaded image */
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if (grub_xnu_hibernate_image)
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grub_free (grub_xnu_hibernate_image);
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grub_xnu_hibernate_image = 0;
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grub_xnu_unlock ();
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return GRUB_ERR_NONE;
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}
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grub_err_t
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grub_xnu_resume (char *imagename)
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{
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grub_file_t file;
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grub_size_t total_header_size;
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struct grub_xnu_hibernate_header hibhead;
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char *buf, *codetmp;
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grub_uint32_t codedest;
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grub_uint32_t codesize;
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file = grub_file_open (imagename);
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if (! file)
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return 0;
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/* Read the header. */
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if (grub_file_read (file, &hibhead, sizeof (hibhead))
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!=sizeof (hibhead))
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{
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grub_file_close (file);
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return grub_error (GRUB_ERR_READ_ERROR,
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"cannot read the hibernate header");
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}
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/* Check the header. */
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if (hibhead.magic != GRUB_XNU_HIBERNATE_MAGIC)
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{
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grub_file_close (file);
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return grub_error (GRUB_ERR_BAD_OS,
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"hibernate header has incorrect magic number");
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}
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if (hibhead.encoffset)
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{
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grub_file_close (file);
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return grub_error (GRUB_ERR_BAD_OS,
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"encrypted images aren't supported yet");
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}
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codedest = hibhead.launchcode_target_page;
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codedest *= GRUB_XNU_PAGESIZE;
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codesize = hibhead.launchcode_numpages;
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codesize *= GRUB_XNU_PAGESIZE;
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/* FIXME: check that codedest..codedest+codesize is available. */
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/* Calculate total size before pages to copy. */
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total_header_size = hibhead.extmapsize + sizeof (hibhead);
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/* Unload image if any. */
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if (grub_xnu_hibernate_image)
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grub_free (grub_xnu_hibernate_image);
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/* Try to allocate necessary space.
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FIXME: mm isn't good enough yet to handle huge allocations.
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*/
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grub_xnu_hibernate_image = buf = grub_malloc (hibhead.image_size);
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if (! buf)
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{
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grub_file_close (file);
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return grub_error (GRUB_ERR_OUT_OF_MEMORY,
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"not enough memory to load image");
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}
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/* Read image. */
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if (grub_file_seek (file, 0) == (grub_off_t)-1
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|| grub_file_read (file, buf, hibhead.image_size)
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!= (grub_ssize_t) hibhead.image_size)
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{
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grub_file_close (file);
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return grub_error (GRUB_ERR_READ_ERROR, "Cannot read resume image.");
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}
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grub_file_close (file);
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codetmp = grub_memalign (GRUB_XNU_PAGESIZE, codesize + GRUB_XNU_PAGESIZE);
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/* Setup variables needed by asm helper. */
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grub_xnu_heap_will_be_at = codedest;
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grub_xnu_heap_start = codetmp;
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grub_xnu_heap_size = codesize;
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grub_xnu_stack = (codedest + hibhead.stack);
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grub_xnu_entry_point = (codedest + hibhead.entry_point);
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grub_xnu_arg1 = (long) buf;
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/* Prepare asm helper. */
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grub_memcpy (codetmp, ((grub_uint8_t *) buf) + total_header_size, codesize);
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grub_memcpy (codetmp + codesize, grub_xnu_launcher_start,
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grub_xnu_launcher_end - grub_xnu_launcher_start);
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/* We're ready now. */
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grub_loader_set ((grub_err_t (*) (void)) (codetmp + codesize),
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grub_xnu_resume_unload, 0);
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/* Prevent module from unloading. */
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grub_xnu_lock ();
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return GRUB_ERR_NONE;
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}
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