83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003,2004,2005,2007,2008 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/memory.h>
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#include <grub/ieee1275/ieee1275.h>
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#include <grub/types.h>
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grub_err_t
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grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
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{
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grub_ieee1275_phandle_t root;
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grub_ieee1275_phandle_t memory;
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grub_uint32_t available[128];
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grub_ssize_t available_size;
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grub_uint32_t address_cells = 1;
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grub_uint32_t size_cells = 1;
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int i;
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/* Determine the format of each entry in `available'. */
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grub_ieee1275_finddevice ("/", &root);
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grub_ieee1275_get_integer_property (root, "#address-cells", &address_cells,
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sizeof address_cells, 0);
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grub_ieee1275_get_integer_property (root, "#size-cells", &size_cells,
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sizeof size_cells, 0);
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if (size_cells > address_cells)
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address_cells = size_cells;
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/* Load `/memory/available'. */
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if (grub_ieee1275_finddevice ("/memory", &memory))
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return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
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"couldn't find /memory node");
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if (grub_ieee1275_get_integer_property (memory, "available", available,
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sizeof available, &available_size))
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return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
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"couldn't examine /memory/available property");
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if (available_size < 0 || (grub_size_t) available_size > sizeof (available))
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return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
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"/memory response buffer exceeded");
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if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_BROKEN_ADDRESS_CELLS))
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{
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address_cells = 1;
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size_cells = 1;
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}
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/* Decode each entry and call `hook'. */
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i = 0;
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available_size /= sizeof (grub_uint32_t);
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while (i < available_size)
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{
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grub_uint64_t address;
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grub_uint64_t size;
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address = available[i++];
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if (address_cells == 2)
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address = (address << 32) | available[i++];
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size = available[i++];
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if (size_cells == 2)
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size = (size << 32) | available[i++];
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if (hook (address, size, GRUB_MEMORY_AVAILABLE, hook_data))
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break;
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}
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return grub_errno;
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}
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