eab6a08c08
The flat DT (currently embedded in vmlinux) is in .init section. The unflattened/binary tree doesn't copy strings through and references them from orig flat DT - which could cause catestrohpy if of_* APIs are called post init, say from a driver which is a loadable module. Reported-by: James Hogan <james.hogan@imgtec.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
123 lines
3.2 KiB
C
123 lines
3.2 KiB
C
/*
|
|
* Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
|
|
*
|
|
* Based on reduced version of METAG
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/clk.h>
|
|
#include <asm/mach_desc.h>
|
|
|
|
/* called from unflatten_device_tree() to bootstrap devicetree itself */
|
|
void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
|
|
{
|
|
return __va(memblock_alloc(size, align));
|
|
}
|
|
|
|
/**
|
|
* setup_machine_fdt - Machine setup when an dtb was passed to the kernel
|
|
* @dt: virtual address pointer to dt blob
|
|
*
|
|
* If a dtb was passed to the kernel, then use it to choose the correct
|
|
* machine_desc and to setup the system.
|
|
*/
|
|
struct machine_desc * __init setup_machine_fdt(void *dt)
|
|
{
|
|
struct boot_param_header *devtree = dt;
|
|
struct machine_desc *mdesc = NULL, *mdesc_best = NULL;
|
|
unsigned int score, mdesc_score = ~1;
|
|
unsigned long dt_root;
|
|
const char *model, *compat;
|
|
void *clk;
|
|
char manufacturer[16];
|
|
unsigned long len;
|
|
|
|
/* check device tree validity */
|
|
if (be32_to_cpu(devtree->magic) != OF_DT_HEADER)
|
|
return NULL;
|
|
|
|
initial_boot_params = devtree;
|
|
dt_root = of_get_flat_dt_root();
|
|
|
|
/*
|
|
* The kernel could be multi-platform enabled, thus could have many
|
|
* "baked-in" machine descriptors. Search thru all for the best
|
|
* "compatible" string match.
|
|
*/
|
|
for_each_machine_desc(mdesc) {
|
|
score = of_flat_dt_match(dt_root, mdesc->dt_compat);
|
|
if (score > 0 && score < mdesc_score) {
|
|
mdesc_best = mdesc;
|
|
mdesc_score = score;
|
|
}
|
|
}
|
|
if (!mdesc_best) {
|
|
const char *prop;
|
|
long size;
|
|
|
|
pr_err("\n unrecognized device tree list:\n[ ");
|
|
|
|
prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
|
|
if (prop) {
|
|
while (size > 0) {
|
|
printk("'%s' ", prop);
|
|
size -= strlen(prop) + 1;
|
|
prop += strlen(prop) + 1;
|
|
}
|
|
}
|
|
printk("]\n\n");
|
|
|
|
machine_halt();
|
|
}
|
|
|
|
/* compat = "<manufacturer>,<model>" */
|
|
compat = mdesc_best->dt_compat[0];
|
|
|
|
model = strchr(compat, ',');
|
|
if (model)
|
|
model++;
|
|
|
|
strlcpy(manufacturer, compat, model ? model - compat : strlen(compat));
|
|
|
|
pr_info("Board \"%s\" from %s (Manufacturer)\n", model, manufacturer);
|
|
|
|
/* Retrieve various information from the /chosen node */
|
|
of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
|
|
|
|
/* Initialize {size,address}-cells info */
|
|
of_scan_flat_dt(early_init_dt_scan_root, NULL);
|
|
|
|
/* Setup memory, calling early_init_dt_add_memory_arch */
|
|
of_scan_flat_dt(early_init_dt_scan_memory, NULL);
|
|
|
|
clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len);
|
|
if (clk)
|
|
arc_set_core_freq(of_read_ulong(clk, len/4));
|
|
|
|
return mdesc_best;
|
|
}
|
|
|
|
/*
|
|
* Copy the flattened DT out of .init since unflattening doesn't copy strings
|
|
* and the normal DT APIs refs them from orig flat DT
|
|
*/
|
|
void __init copy_devtree(void)
|
|
{
|
|
void *alloc = early_init_dt_alloc_memory_arch(
|
|
be32_to_cpu(initial_boot_params->totalsize), 64);
|
|
if (alloc) {
|
|
memcpy(alloc, initial_boot_params,
|
|
be32_to_cpu(initial_boot_params->totalsize));
|
|
initial_boot_params = alloc;
|
|
}
|
|
}
|