78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2011 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/datetime.h>
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#include <grub/cmos.h>
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#include <grub/dl.h>
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#include <grub/ieee1275/ieee1275.h>
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#include <grub/misc.h>
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volatile grub_uint8_t *grub_cmos_port = 0;
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/* Helper for grub_cmos_find_port. */
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static int
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grub_cmos_find_port_iter (struct grub_ieee1275_devalias *alias)
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{
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grub_ieee1275_phandle_t dev;
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grub_uint32_t addr[2];
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grub_ssize_t actual;
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/* Enough to check if it's "m5819" */
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char compat[100];
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if (grub_ieee1275_finddevice (alias->path, &dev))
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return 0;
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if (grub_ieee1275_get_property (dev, "compatible", compat, sizeof (compat),
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0))
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return 0;
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if (grub_strcmp (compat, "m5819") != 0)
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return 0;
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if (grub_ieee1275_get_integer_property (dev, "address",
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addr, sizeof (addr), &actual))
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return 0;
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if (actual == 4)
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{
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grub_cmos_port = (volatile grub_uint8_t *) (grub_addr_t) addr[0];
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return 1;
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}
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#if GRUB_CPU_SIZEOF_VOID_P == 8
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if (actual == 8)
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{
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grub_cmos_port = (volatile grub_uint8_t *)
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((((grub_addr_t) addr[0]) << 32) | addr[1]);
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return 1;
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}
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#else
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if (actual == 8 && addr[0] == 0)
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{
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grub_cmos_port = (volatile grub_uint8_t *) addr[1];
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return 1;
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}
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#endif
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return 0;
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}
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grub_err_t
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grub_cmos_find_port (void)
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{
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grub_ieee1275_devices_iterate (grub_cmos_find_port_iter);
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if (!grub_cmos_port)
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return grub_error (GRUB_ERR_IO, "no cmos found");
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return GRUB_ERR_NONE;
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}
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