![Laura Abbott](/assets/img/avatar_default.png)
Buggy bootloaders may pass bogus memory entries in the devicetree. Add of_fdt_limit_memory to add an upper bound on the number of entries that can be present in the devicetree. Signed-off-by: Laura Abbott <lauraa@codeaurora.org> Tested-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Grant Likely <grant.likely@linaro.org>
1103 lines
28 KiB
C
1103 lines
28 KiB
C
/*
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* Functions for working with the Flattened Device Tree data format
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*
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* Copyright 2009 Benjamin Herrenschmidt, IBM Corp
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* benh@kernel.crashing.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/initrd.h>
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#include <linux/memblock.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <linux/of_reserved_mem.h>
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#include <linux/sizes.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/libfdt.h>
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#include <linux/debugfs.h>
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#include <linux/serial_core.h>
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#include <asm/setup.h> /* for COMMAND_LINE_SIZE */
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#include <asm/page.h>
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/*
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* of_fdt_limit_memory - limit the number of regions in the /memory node
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* @limit: maximum entries
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*
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* Adjust the flattened device tree to have at most 'limit' number of
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* memory entries in the /memory node. This function may be called
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* any time after initial_boot_param is set.
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*/
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void of_fdt_limit_memory(int limit)
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{
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int memory;
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int len;
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const void *val;
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int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
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int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
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const uint32_t *addr_prop;
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const uint32_t *size_prop;
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int root_offset;
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int cell_size;
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root_offset = fdt_path_offset(initial_boot_params, "/");
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if (root_offset < 0)
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return;
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addr_prop = fdt_getprop(initial_boot_params, root_offset,
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"#address-cells", NULL);
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if (addr_prop)
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nr_address_cells = fdt32_to_cpu(*addr_prop);
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size_prop = fdt_getprop(initial_boot_params, root_offset,
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"#size-cells", NULL);
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if (size_prop)
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nr_size_cells = fdt32_to_cpu(*size_prop);
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cell_size = sizeof(uint32_t)*(nr_address_cells + nr_size_cells);
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memory = fdt_path_offset(initial_boot_params, "/memory");
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if (memory > 0) {
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val = fdt_getprop(initial_boot_params, memory, "reg", &len);
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if (len > limit*cell_size) {
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len = limit*cell_size;
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pr_debug("Limiting number of entries to %d\n", limit);
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fdt_setprop(initial_boot_params, memory, "reg", val,
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len);
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}
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}
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}
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/**
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* of_fdt_is_compatible - Return true if given node from the given blob has
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* compat in its compatible list
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* @blob: A device tree blob
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* @node: node to test
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* @compat: compatible string to compare with compatible list.
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*
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* On match, returns a non-zero value with smaller values returned for more
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* specific compatible values.
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*/
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int of_fdt_is_compatible(const void *blob,
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unsigned long node, const char *compat)
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{
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const char *cp;
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int cplen;
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unsigned long l, score = 0;
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cp = fdt_getprop(blob, node, "compatible", &cplen);
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if (cp == NULL)
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return 0;
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while (cplen > 0) {
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score++;
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if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
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return score;
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l = strlen(cp) + 1;
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cp += l;
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cplen -= l;
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}
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return 0;
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}
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/**
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* of_fdt_match - Return true if node matches a list of compatible values
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*/
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int of_fdt_match(const void *blob, unsigned long node,
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const char *const *compat)
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{
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unsigned int tmp, score = 0;
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if (!compat)
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return 0;
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while (*compat) {
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tmp = of_fdt_is_compatible(blob, node, *compat);
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if (tmp && (score == 0 || (tmp < score)))
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score = tmp;
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compat++;
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}
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return score;
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}
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static void *unflatten_dt_alloc(void **mem, unsigned long size,
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unsigned long align)
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{
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void *res;
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*mem = PTR_ALIGN(*mem, align);
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res = *mem;
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*mem += size;
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return res;
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}
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/**
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* unflatten_dt_node - Alloc and populate a device_node from the flat tree
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* @blob: The parent device tree blob
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* @mem: Memory chunk to use for allocating device nodes and properties
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* @p: pointer to node in flat tree
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* @dad: Parent struct device_node
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* @allnextpp: pointer to ->allnext from last allocated device_node
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* @fpsize: Size of the node path up at the current depth.
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*/
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static void * unflatten_dt_node(void *blob,
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void *mem,
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int *poffset,
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struct device_node *dad,
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struct device_node ***allnextpp,
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unsigned long fpsize)
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{
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const __be32 *p;
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struct device_node *np;
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struct property *pp, **prev_pp = NULL;
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const char *pathp;
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unsigned int l, allocl;
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static int depth = 0;
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int old_depth;
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int offset;
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int has_name = 0;
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int new_format = 0;
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pathp = fdt_get_name(blob, *poffset, &l);
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if (!pathp)
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return mem;
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allocl = l++;
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/* version 0x10 has a more compact unit name here instead of the full
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* path. we accumulate the full path size using "fpsize", we'll rebuild
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* it later. We detect this because the first character of the name is
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* not '/'.
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*/
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if ((*pathp) != '/') {
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new_format = 1;
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if (fpsize == 0) {
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/* root node: special case. fpsize accounts for path
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* plus terminating zero. root node only has '/', so
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* fpsize should be 2, but we want to avoid the first
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* level nodes to have two '/' so we use fpsize 1 here
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*/
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fpsize = 1;
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allocl = 2;
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l = 1;
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pathp = "";
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} else {
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/* account for '/' and path size minus terminal 0
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* already in 'l'
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*/
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fpsize += l;
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allocl = fpsize;
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}
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}
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np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
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__alignof__(struct device_node));
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if (allnextpp) {
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char *fn;
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of_node_init(np);
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np->full_name = fn = ((char *)np) + sizeof(*np);
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if (new_format) {
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/* rebuild full path for new format */
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if (dad && dad->parent) {
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strcpy(fn, dad->full_name);
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#ifdef DEBUG
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if ((strlen(fn) + l + 1) != allocl) {
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pr_debug("%s: p: %d, l: %d, a: %d\n",
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pathp, (int)strlen(fn),
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l, allocl);
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}
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#endif
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fn += strlen(fn);
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}
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*(fn++) = '/';
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}
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memcpy(fn, pathp, l);
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prev_pp = &np->properties;
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**allnextpp = np;
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*allnextpp = &np->allnext;
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if (dad != NULL) {
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np->parent = dad;
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/* we temporarily use the next field as `last_child'*/
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if (dad->next == NULL)
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dad->child = np;
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else
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dad->next->sibling = np;
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dad->next = np;
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}
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}
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/* process properties */
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for (offset = fdt_first_property_offset(blob, *poffset);
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(offset >= 0);
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(offset = fdt_next_property_offset(blob, offset))) {
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const char *pname;
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u32 sz;
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if (!(p = fdt_getprop_by_offset(blob, offset, &pname, &sz))) {
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offset = -FDT_ERR_INTERNAL;
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break;
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}
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if (pname == NULL) {
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pr_info("Can't find property name in list !\n");
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break;
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}
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if (strcmp(pname, "name") == 0)
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has_name = 1;
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pp = unflatten_dt_alloc(&mem, sizeof(struct property),
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__alignof__(struct property));
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if (allnextpp) {
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/* We accept flattened tree phandles either in
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* ePAPR-style "phandle" properties, or the
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* legacy "linux,phandle" properties. If both
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* appear and have different values, things
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* will get weird. Don't do that. */
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if ((strcmp(pname, "phandle") == 0) ||
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(strcmp(pname, "linux,phandle") == 0)) {
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if (np->phandle == 0)
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np->phandle = be32_to_cpup(p);
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}
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/* And we process the "ibm,phandle" property
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* used in pSeries dynamic device tree
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* stuff */
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if (strcmp(pname, "ibm,phandle") == 0)
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np->phandle = be32_to_cpup(p);
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pp->name = (char *)pname;
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pp->length = sz;
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pp->value = (__be32 *)p;
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*prev_pp = pp;
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prev_pp = &pp->next;
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}
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}
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/* with version 0x10 we may not have the name property, recreate
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* it here from the unit name if absent
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*/
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if (!has_name) {
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const char *p1 = pathp, *ps = pathp, *pa = NULL;
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int sz;
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while (*p1) {
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if ((*p1) == '@')
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pa = p1;
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if ((*p1) == '/')
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ps = p1 + 1;
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p1++;
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}
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if (pa < ps)
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pa = p1;
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sz = (pa - ps) + 1;
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pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
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__alignof__(struct property));
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if (allnextpp) {
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pp->name = "name";
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pp->length = sz;
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pp->value = pp + 1;
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*prev_pp = pp;
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prev_pp = &pp->next;
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memcpy(pp->value, ps, sz - 1);
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((char *)pp->value)[sz - 1] = 0;
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pr_debug("fixed up name for %s -> %s\n", pathp,
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(char *)pp->value);
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}
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}
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if (allnextpp) {
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*prev_pp = NULL;
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np->name = of_get_property(np, "name", NULL);
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np->type = of_get_property(np, "device_type", NULL);
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if (!np->name)
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np->name = "<NULL>";
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if (!np->type)
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np->type = "<NULL>";
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}
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old_depth = depth;
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*poffset = fdt_next_node(blob, *poffset, &depth);
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if (depth < 0)
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depth = 0;
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while (*poffset > 0 && depth > old_depth)
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mem = unflatten_dt_node(blob, mem, poffset, np, allnextpp,
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fpsize);
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if (*poffset < 0 && *poffset != -FDT_ERR_NOTFOUND)
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pr_err("unflatten: error %d processing FDT\n", *poffset);
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return mem;
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}
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/**
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* __unflatten_device_tree - create tree of device_nodes from flat blob
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*
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* unflattens a device-tree, creating the
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* tree of struct device_node. It also fills the "name" and "type"
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* pointers of the nodes so the normal device-tree walking functions
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* can be used.
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* @blob: The blob to expand
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* @mynodes: The device_node tree created by the call
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* @dt_alloc: An allocator that provides a virtual address to memory
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* for the resulting tree
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*/
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static void __unflatten_device_tree(void *blob,
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struct device_node **mynodes,
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void * (*dt_alloc)(u64 size, u64 align))
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{
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unsigned long size;
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int start;
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void *mem;
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struct device_node **allnextp = mynodes;
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pr_debug(" -> unflatten_device_tree()\n");
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if (!blob) {
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pr_debug("No device tree pointer\n");
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return;
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}
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pr_debug("Unflattening device tree:\n");
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pr_debug("magic: %08x\n", fdt_magic(blob));
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pr_debug("size: %08x\n", fdt_totalsize(blob));
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pr_debug("version: %08x\n", fdt_version(blob));
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if (fdt_check_header(blob)) {
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pr_err("Invalid device tree blob header\n");
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return;
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}
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/* First pass, scan for size */
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start = 0;
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size = (unsigned long)unflatten_dt_node(blob, NULL, &start, NULL, NULL, 0);
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size = ALIGN(size, 4);
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pr_debug(" size is %lx, allocating...\n", size);
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/* Allocate memory for the expanded device tree */
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mem = dt_alloc(size + 4, __alignof__(struct device_node));
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memset(mem, 0, size);
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*(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef);
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pr_debug(" unflattening %p...\n", mem);
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/* Second pass, do actual unflattening */
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start = 0;
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unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0);
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if (be32_to_cpup(mem + size) != 0xdeadbeef)
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pr_warning("End of tree marker overwritten: %08x\n",
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be32_to_cpup(mem + size));
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*allnextp = NULL;
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pr_debug(" <- unflatten_device_tree()\n");
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}
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static void *kernel_tree_alloc(u64 size, u64 align)
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{
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return kzalloc(size, GFP_KERNEL);
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}
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/**
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* of_fdt_unflatten_tree - create tree of device_nodes from flat blob
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*
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* unflattens the device-tree passed by the firmware, creating the
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* tree of struct device_node. It also fills the "name" and "type"
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* pointers of the nodes so the normal device-tree walking functions
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* can be used.
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*/
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void of_fdt_unflatten_tree(unsigned long *blob,
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struct device_node **mynodes)
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{
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__unflatten_device_tree(blob, mynodes, &kernel_tree_alloc);
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}
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EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
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/* Everything below here references initial_boot_params directly. */
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int __initdata dt_root_addr_cells;
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int __initdata dt_root_size_cells;
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void *initial_boot_params;
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#ifdef CONFIG_OF_EARLY_FLATTREE
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/**
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* res_mem_reserve_reg() - reserve all memory described in 'reg' property
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*/
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static int __init __reserved_mem_reserve_reg(unsigned long node,
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const char *uname)
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{
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int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
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phys_addr_t base, size;
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int len;
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const __be32 *prop;
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int nomap, first = 1;
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prop = of_get_flat_dt_prop(node, "reg", &len);
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if (!prop)
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return -ENOENT;
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if (len && len % t_len != 0) {
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pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n",
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uname);
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return -EINVAL;
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}
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nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
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while (len >= t_len) {
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base = dt_mem_next_cell(dt_root_addr_cells, &prop);
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size = dt_mem_next_cell(dt_root_size_cells, &prop);
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if (base && size &&
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early_init_dt_reserve_memory_arch(base, size, nomap) == 0)
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pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n",
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uname, &base, (unsigned long)size / SZ_1M);
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else
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pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n",
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uname, &base, (unsigned long)size / SZ_1M);
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len -= t_len;
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if (first) {
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fdt_reserved_mem_save_node(node, uname, base, size);
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first = 0;
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}
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}
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return 0;
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}
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/**
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* __reserved_mem_check_root() - check if #size-cells, #address-cells provided
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* in /reserved-memory matches the values supported by the current implementation,
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* also check if ranges property has been provided
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*/
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static int __init __reserved_mem_check_root(unsigned long node)
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{
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const __be32 *prop;
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prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
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if (!prop || be32_to_cpup(prop) != dt_root_size_cells)
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return -EINVAL;
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prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
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if (!prop || be32_to_cpup(prop) != dt_root_addr_cells)
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return -EINVAL;
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prop = of_get_flat_dt_prop(node, "ranges", NULL);
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if (!prop)
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return -EINVAL;
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return 0;
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}
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/**
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* fdt_scan_reserved_mem() - scan a single FDT node for reserved memory
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*/
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static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
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int depth, void *data)
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{
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static int found;
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const char *status;
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int err;
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if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) {
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if (__reserved_mem_check_root(node) != 0) {
|
|
pr_err("Reserved memory: unsupported node format, ignoring\n");
|
|
/* break scan */
|
|
return 1;
|
|
}
|
|
found = 1;
|
|
/* scan next node */
|
|
return 0;
|
|
} else if (!found) {
|
|
/* scan next node */
|
|
return 0;
|
|
} else if (found && depth < 2) {
|
|
/* scanning of /reserved-memory has been finished */
|
|
return 1;
|
|
}
|
|
|
|
status = of_get_flat_dt_prop(node, "status", NULL);
|
|
if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0)
|
|
return 0;
|
|
|
|
err = __reserved_mem_reserve_reg(node, uname);
|
|
if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL))
|
|
fdt_reserved_mem_save_node(node, uname, 0, 0);
|
|
|
|
/* scan next node */
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* early_init_fdt_scan_reserved_mem() - create reserved memory regions
|
|
*
|
|
* This function grabs memory from early allocator for device exclusive use
|
|
* defined in device tree structures. It should be called by arch specific code
|
|
* once the early allocator (i.e. memblock) has been fully activated.
|
|
*/
|
|
void __init early_init_fdt_scan_reserved_mem(void)
|
|
{
|
|
int n;
|
|
u64 base, size;
|
|
|
|
if (!initial_boot_params)
|
|
return;
|
|
|
|
/* Reserve the dtb region */
|
|
early_init_dt_reserve_memory_arch(__pa(initial_boot_params),
|
|
fdt_totalsize(initial_boot_params),
|
|
0);
|
|
|
|
/* Process header /memreserve/ fields */
|
|
for (n = 0; ; n++) {
|
|
fdt_get_mem_rsv(initial_boot_params, n, &base, &size);
|
|
if (!size)
|
|
break;
|
|
early_init_dt_reserve_memory_arch(base, size, 0);
|
|
}
|
|
|
|
of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
|
|
fdt_init_reserved_mem();
|
|
}
|
|
|
|
/**
|
|
* of_scan_flat_dt - scan flattened tree blob and call callback on each.
|
|
* @it: callback function
|
|
* @data: context data pointer
|
|
*
|
|
* This function is used to scan the flattened device-tree, it is
|
|
* used to extract the memory information at boot before we can
|
|
* unflatten the tree
|
|
*/
|
|
int __init of_scan_flat_dt(int (*it)(unsigned long node,
|
|
const char *uname, int depth,
|
|
void *data),
|
|
void *data)
|
|
{
|
|
const void *blob = initial_boot_params;
|
|
const char *pathp;
|
|
int offset, rc = 0, depth = -1;
|
|
|
|
for (offset = fdt_next_node(blob, -1, &depth);
|
|
offset >= 0 && depth >= 0 && !rc;
|
|
offset = fdt_next_node(blob, offset, &depth)) {
|
|
|
|
pathp = fdt_get_name(blob, offset, NULL);
|
|
if (*pathp == '/')
|
|
pathp = kbasename(pathp);
|
|
rc = it(offset, pathp, depth, data);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* of_get_flat_dt_root - find the root node in the flat blob
|
|
*/
|
|
unsigned long __init of_get_flat_dt_root(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* of_get_flat_dt_size - Return the total size of the FDT
|
|
*/
|
|
int __init of_get_flat_dt_size(void)
|
|
{
|
|
return fdt_totalsize(initial_boot_params);
|
|
}
|
|
|
|
/**
|
|
* of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
|
|
*
|
|
* This function can be used within scan_flattened_dt callback to get
|
|
* access to properties
|
|
*/
|
|
const void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
|
|
int *size)
|
|
{
|
|
return fdt_getprop(initial_boot_params, node, name, size);
|
|
}
|
|
|
|
/**
|
|
* of_flat_dt_is_compatible - Return true if given node has compat in compatible list
|
|
* @node: node to test
|
|
* @compat: compatible string to compare with compatible list.
|
|
*/
|
|
int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
|
|
{
|
|
return of_fdt_is_compatible(initial_boot_params, node, compat);
|
|
}
|
|
|
|
/**
|
|
* of_flat_dt_match - Return true if node matches a list of compatible values
|
|
*/
|
|
int __init of_flat_dt_match(unsigned long node, const char *const *compat)
|
|
{
|
|
return of_fdt_match(initial_boot_params, node, compat);
|
|
}
|
|
|
|
struct fdt_scan_status {
|
|
const char *name;
|
|
int namelen;
|
|
int depth;
|
|
int found;
|
|
int (*iterator)(unsigned long node, const char *uname, int depth, void *data);
|
|
void *data;
|
|
};
|
|
|
|
const char * __init of_flat_dt_get_machine_name(void)
|
|
{
|
|
const char *name;
|
|
unsigned long dt_root = of_get_flat_dt_root();
|
|
|
|
name = of_get_flat_dt_prop(dt_root, "model", NULL);
|
|
if (!name)
|
|
name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
|
|
return name;
|
|
}
|
|
|
|
/**
|
|
* of_flat_dt_match_machine - Iterate match tables to find matching machine.
|
|
*
|
|
* @default_match: A machine specific ptr to return in case of no match.
|
|
* @get_next_compat: callback function to return next compatible match table.
|
|
*
|
|
* Iterate through machine match tables to find the best match for the machine
|
|
* compatible string in the FDT.
|
|
*/
|
|
const void * __init of_flat_dt_match_machine(const void *default_match,
|
|
const void * (*get_next_compat)(const char * const**))
|
|
{
|
|
const void *data = NULL;
|
|
const void *best_data = default_match;
|
|
const char *const *compat;
|
|
unsigned long dt_root;
|
|
unsigned int best_score = ~1, score = 0;
|
|
|
|
dt_root = of_get_flat_dt_root();
|
|
while ((data = get_next_compat(&compat))) {
|
|
score = of_flat_dt_match(dt_root, compat);
|
|
if (score > 0 && score < best_score) {
|
|
best_data = data;
|
|
best_score = score;
|
|
}
|
|
}
|
|
if (!best_data) {
|
|
const char *prop;
|
|
int 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");
|
|
return NULL;
|
|
}
|
|
|
|
pr_info("Machine model: %s\n", of_flat_dt_get_machine_name());
|
|
|
|
return best_data;
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
/**
|
|
* early_init_dt_check_for_initrd - Decode initrd location from flat tree
|
|
* @node: reference to node containing initrd location ('chosen')
|
|
*/
|
|
static void __init early_init_dt_check_for_initrd(unsigned long node)
|
|
{
|
|
u64 start, end;
|
|
int len;
|
|
const __be32 *prop;
|
|
|
|
pr_debug("Looking for initrd properties... ");
|
|
|
|
prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
|
|
if (!prop)
|
|
return;
|
|
start = of_read_number(prop, len/4);
|
|
|
|
prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
|
|
if (!prop)
|
|
return;
|
|
end = of_read_number(prop, len/4);
|
|
|
|
initrd_start = (unsigned long)__va(start);
|
|
initrd_end = (unsigned long)__va(end);
|
|
initrd_below_start_ok = 1;
|
|
|
|
pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n",
|
|
(unsigned long long)start, (unsigned long long)end);
|
|
}
|
|
#else
|
|
static inline void early_init_dt_check_for_initrd(unsigned long node)
|
|
{
|
|
}
|
|
#endif /* CONFIG_BLK_DEV_INITRD */
|
|
|
|
#ifdef CONFIG_SERIAL_EARLYCON
|
|
extern struct of_device_id __earlycon_of_table[];
|
|
|
|
int __init early_init_dt_scan_chosen_serial(void)
|
|
{
|
|
int offset;
|
|
const char *p;
|
|
int l;
|
|
const struct of_device_id *match = __earlycon_of_table;
|
|
const void *fdt = initial_boot_params;
|
|
|
|
offset = fdt_path_offset(fdt, "/chosen");
|
|
if (offset < 0)
|
|
offset = fdt_path_offset(fdt, "/chosen@0");
|
|
if (offset < 0)
|
|
return -ENOENT;
|
|
|
|
p = fdt_getprop(fdt, offset, "stdout-path", &l);
|
|
if (!p)
|
|
p = fdt_getprop(fdt, offset, "linux,stdout-path", &l);
|
|
if (!p || !l)
|
|
return -ENOENT;
|
|
|
|
/* Get the node specified by stdout-path */
|
|
offset = fdt_path_offset(fdt, p);
|
|
if (offset < 0)
|
|
return -ENODEV;
|
|
|
|
while (match->compatible) {
|
|
unsigned long addr;
|
|
if (fdt_node_check_compatible(fdt, offset, match->compatible)) {
|
|
match++;
|
|
continue;
|
|
}
|
|
|
|
addr = fdt_translate_address(fdt, offset);
|
|
if (!addr)
|
|
return -ENXIO;
|
|
|
|
of_setup_earlycon(addr, match->data);
|
|
return 0;
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int __init setup_of_earlycon(char *buf)
|
|
{
|
|
if (buf)
|
|
return 0;
|
|
|
|
return early_init_dt_scan_chosen_serial();
|
|
}
|
|
early_param("earlycon", setup_of_earlycon);
|
|
#endif
|
|
|
|
/**
|
|
* early_init_dt_scan_root - fetch the top level address and size cells
|
|
*/
|
|
int __init early_init_dt_scan_root(unsigned long node, const char *uname,
|
|
int depth, void *data)
|
|
{
|
|
const __be32 *prop;
|
|
|
|
if (depth != 0)
|
|
return 0;
|
|
|
|
dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
|
|
dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
|
|
|
|
prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
|
|
if (prop)
|
|
dt_root_size_cells = be32_to_cpup(prop);
|
|
pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
|
|
|
|
prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
|
|
if (prop)
|
|
dt_root_addr_cells = be32_to_cpup(prop);
|
|
pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
|
|
|
|
/* break now */
|
|
return 1;
|
|
}
|
|
|
|
u64 __init dt_mem_next_cell(int s, const __be32 **cellp)
|
|
{
|
|
const __be32 *p = *cellp;
|
|
|
|
*cellp = p + s;
|
|
return of_read_number(p, s);
|
|
}
|
|
|
|
/**
|
|
* early_init_dt_scan_memory - Look for an parse memory nodes
|
|
*/
|
|
int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
|
|
int depth, void *data)
|
|
{
|
|
const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
|
|
const __be32 *reg, *endp;
|
|
int l;
|
|
|
|
/* We are scanning "memory" nodes only */
|
|
if (type == NULL) {
|
|
/*
|
|
* The longtrail doesn't have a device_type on the
|
|
* /memory node, so look for the node called /memory@0.
|
|
*/
|
|
if (!IS_ENABLED(CONFIG_PPC32) || depth != 1 || strcmp(uname, "memory@0") != 0)
|
|
return 0;
|
|
} else if (strcmp(type, "memory") != 0)
|
|
return 0;
|
|
|
|
reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
|
|
if (reg == NULL)
|
|
reg = of_get_flat_dt_prop(node, "reg", &l);
|
|
if (reg == NULL)
|
|
return 0;
|
|
|
|
endp = reg + (l / sizeof(__be32));
|
|
|
|
pr_debug("memory scan node %s, reg size %d, data: %x %x %x %x,\n",
|
|
uname, l, reg[0], reg[1], reg[2], reg[3]);
|
|
|
|
while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
|
|
u64 base, size;
|
|
|
|
base = dt_mem_next_cell(dt_root_addr_cells, ®);
|
|
size = dt_mem_next_cell(dt_root_size_cells, ®);
|
|
|
|
if (size == 0)
|
|
continue;
|
|
pr_debug(" - %llx , %llx\n", (unsigned long long)base,
|
|
(unsigned long long)size);
|
|
|
|
early_init_dt_add_memory_arch(base, size);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
|
|
int depth, void *data)
|
|
{
|
|
int l;
|
|
const char *p;
|
|
|
|
pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
|
|
|
|
if (depth != 1 || !data ||
|
|
(strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
|
|
return 0;
|
|
|
|
early_init_dt_check_for_initrd(node);
|
|
|
|
/* Retrieve command line */
|
|
p = of_get_flat_dt_prop(node, "bootargs", &l);
|
|
if (p != NULL && l > 0)
|
|
strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
|
|
|
|
/*
|
|
* CONFIG_CMDLINE is meant to be a default in case nothing else
|
|
* managed to set the command line, unless CONFIG_CMDLINE_FORCE
|
|
* is set in which case we override whatever was found earlier.
|
|
*/
|
|
#ifdef CONFIG_CMDLINE
|
|
#ifndef CONFIG_CMDLINE_FORCE
|
|
if (!((char *)data)[0])
|
|
#endif
|
|
strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
|
|
#endif /* CONFIG_CMDLINE */
|
|
|
|
pr_debug("Command line is: %s\n", (char*)data);
|
|
|
|
/* break now */
|
|
return 1;
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_MEMBLOCK
|
|
void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
|
|
{
|
|
const u64 phys_offset = __pa(PAGE_OFFSET);
|
|
base &= PAGE_MASK;
|
|
size &= PAGE_MASK;
|
|
|
|
if (sizeof(phys_addr_t) < sizeof(u64)) {
|
|
if (base > ULONG_MAX) {
|
|
pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
|
|
base, base + size);
|
|
return;
|
|
}
|
|
|
|
if (base + size > ULONG_MAX) {
|
|
pr_warning("Ignoring memory range 0x%lx - 0x%llx\n",
|
|
ULONG_MAX, base + size);
|
|
size = ULONG_MAX - base;
|
|
}
|
|
}
|
|
|
|
if (base + size < phys_offset) {
|
|
pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
|
|
base, base + size);
|
|
return;
|
|
}
|
|
if (base < phys_offset) {
|
|
pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
|
|
base, phys_offset);
|
|
size -= phys_offset - base;
|
|
base = phys_offset;
|
|
}
|
|
memblock_add(base, size);
|
|
}
|
|
|
|
int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
|
|
phys_addr_t size, bool nomap)
|
|
{
|
|
if (memblock_is_region_reserved(base, size))
|
|
return -EBUSY;
|
|
if (nomap)
|
|
return memblock_remove(base, size);
|
|
return memblock_reserve(base, size);
|
|
}
|
|
|
|
/*
|
|
* called from unflatten_device_tree() to bootstrap devicetree itself
|
|
* Architectures can override this definition if memblock isn't used
|
|
*/
|
|
void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align)
|
|
{
|
|
return __va(memblock_alloc(size, align));
|
|
}
|
|
#else
|
|
int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
|
|
phys_addr_t size, bool nomap)
|
|
{
|
|
pr_err("Reserved memory not supported, ignoring range 0x%pa - 0x%pa%s\n",
|
|
&base, &size, nomap ? " (nomap)" : "");
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
bool __init early_init_dt_verify(void *params)
|
|
{
|
|
if (!params)
|
|
return false;
|
|
|
|
/* Setup flat device-tree pointer */
|
|
initial_boot_params = params;
|
|
|
|
/* check device tree validity */
|
|
if (fdt_check_header(params)) {
|
|
initial_boot_params = NULL;
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
void __init early_init_dt_scan_nodes(void)
|
|
{
|
|
/* 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);
|
|
}
|
|
|
|
bool __init early_init_dt_scan(void *params)
|
|
{
|
|
bool status;
|
|
|
|
status = early_init_dt_verify(params);
|
|
if (!status)
|
|
return false;
|
|
|
|
early_init_dt_scan_nodes();
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* unflatten_device_tree - create tree of device_nodes from flat blob
|
|
*
|
|
* unflattens the device-tree passed by the firmware, creating the
|
|
* tree of struct device_node. It also fills the "name" and "type"
|
|
* pointers of the nodes so the normal device-tree walking functions
|
|
* can be used.
|
|
*/
|
|
void __init unflatten_device_tree(void)
|
|
{
|
|
__unflatten_device_tree(initial_boot_params, &of_allnodes,
|
|
early_init_dt_alloc_memory_arch);
|
|
|
|
/* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */
|
|
of_alias_scan(early_init_dt_alloc_memory_arch);
|
|
}
|
|
|
|
/**
|
|
* unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob
|
|
*
|
|
* Copies and unflattens the device-tree passed by the firmware, creating the
|
|
* tree of struct device_node. It also fills the "name" and "type"
|
|
* pointers of the nodes so the normal device-tree walking functions
|
|
* can be used. This should only be used when the FDT memory has not been
|
|
* reserved such is the case when the FDT is built-in to the kernel init
|
|
* section. If the FDT memory is reserved already then unflatten_device_tree
|
|
* should be used instead.
|
|
*/
|
|
void __init unflatten_and_copy_device_tree(void)
|
|
{
|
|
int size;
|
|
void *dt;
|
|
|
|
if (!initial_boot_params) {
|
|
pr_warn("No valid device tree found, continuing without\n");
|
|
return;
|
|
}
|
|
|
|
size = fdt_totalsize(initial_boot_params);
|
|
dt = early_init_dt_alloc_memory_arch(size,
|
|
roundup_pow_of_two(FDT_V17_SIZE));
|
|
|
|
if (dt) {
|
|
memcpy(dt, initial_boot_params, size);
|
|
initial_boot_params = dt;
|
|
}
|
|
unflatten_device_tree();
|
|
}
|
|
|
|
#if defined(CONFIG_DEBUG_FS) && defined(DEBUG)
|
|
static struct debugfs_blob_wrapper flat_dt_blob;
|
|
|
|
static int __init of_flat_dt_debugfs_export_fdt(void)
|
|
{
|
|
struct dentry *d = debugfs_create_dir("device-tree", NULL);
|
|
|
|
if (!d)
|
|
return -ENOENT;
|
|
|
|
flat_dt_blob.data = initial_boot_params;
|
|
flat_dt_blob.size = fdt_totalsize(initial_boot_params);
|
|
|
|
d = debugfs_create_blob("flat-device-tree", S_IFREG | S_IRUSR,
|
|
d, &flat_dt_blob);
|
|
if (!d)
|
|
return -ENOENT;
|
|
|
|
return 0;
|
|
}
|
|
module_init(of_flat_dt_debugfs_export_fdt);
|
|
#endif
|
|
|
|
#endif /* CONFIG_OF_EARLY_FLATTREE */
|