91 строка
2.8 KiB
C
91 строка
2.8 KiB
C
/*
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* The simple platform -- for booting when firmware doesn't supply a device
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* tree or any platform configuration information.
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* All data is extracted from an embedded device tree
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* blob.
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*
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* Authors: Scott Wood <scottwood@freescale.com>
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* Grant Likely <grant.likely@secretlab.ca>
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*
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* Copyright (c) 2007 Freescale Semiconductor, Inc.
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* Copyright (c) 2008 Secret Lab Technologies Ltd.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include "ops.h"
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#include "types.h"
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#include "io.h"
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#include "stdio.h"
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#include <libfdt.h>
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BSS_STACK(4*1024);
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extern int platform_specific_init(void) __attribute__((weak));
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void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
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unsigned long r6, unsigned long r7)
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{
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const u32 *na, *ns, *reg, *timebase;
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u64 memsize64;
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int node, size, i;
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/* Make sure FDT blob is sane */
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if (fdt_check_header(_dtb_start) != 0)
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fatal("Invalid device tree blob\n");
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/* Find the #address-cells and #size-cells properties */
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node = fdt_path_offset(_dtb_start, "/");
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if (node < 0)
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fatal("Cannot find root node\n");
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na = fdt_getprop(_dtb_start, node, "#address-cells", &size);
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if (!na || (size != 4))
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fatal("Cannot find #address-cells property");
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ns = fdt_getprop(_dtb_start, node, "#size-cells", &size);
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if (!ns || (size != 4))
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fatal("Cannot find #size-cells property");
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/* Find the memory range */
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node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
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"memory", sizeof("memory"));
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if (node < 0)
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fatal("Cannot find memory node\n");
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reg = fdt_getprop(_dtb_start, node, "reg", &size);
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if (size < (*na+*ns) * sizeof(u32))
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fatal("cannot get memory range\n");
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/* Only interested in memory based at 0 */
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for (i = 0; i < *na; i++)
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if (*reg++ != 0)
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fatal("Memory range is not based at address 0\n");
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/* get the memsize and trucate it to under 4G on 32 bit machines */
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memsize64 = 0;
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for (i = 0; i < *ns; i++)
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memsize64 = (memsize64 << 32) | *reg++;
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if (sizeof(void *) == 4 && memsize64 >= 0x100000000ULL)
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memsize64 = 0xffffffff;
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/* finally, setup the timebase */
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node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
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"cpu", sizeof("cpu"));
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if (!node)
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fatal("Cannot find cpu node\n");
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timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
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if (timebase && (size == 4))
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timebase_period_ns = 1000000000 / *timebase;
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/* Now we have the memory size; initialize the heap */
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simple_alloc_init(_end, memsize64 - (unsigned long)_end, 32, 64);
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/* prepare the device tree and find the console */
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fdt_init(_dtb_start);
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if (platform_specific_init)
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platform_specific_init();
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serial_console_init();
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}
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