| /* |
| * Functions for working with the Flattened Device Tree data format |
| * |
| * Copyright 2009 Benjamin Herrenschmidt, IBM Corp |
| * benh@kernel.crashing.org |
| * |
| * 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/kernel.h> |
| #include <linux/initrd.h> |
| #include <linux/memblock.h> |
| #include <linux/module.h> |
| #include <linux/of.h> |
| #include <linux/of_fdt.h> |
| #include <linux/string.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| |
| #include <asm/setup.h> /* for COMMAND_LINE_SIZE */ |
| #ifdef CONFIG_PPC |
| #include <asm/machdep.h> |
| #endif /* CONFIG_PPC */ |
| |
| #include <asm/page.h> |
| |
| char *of_fdt_get_string(struct boot_param_header *blob, u32 offset) |
| { |
| return ((char *)blob) + |
| be32_to_cpu(blob->off_dt_strings) + offset; |
| } |
| |
| /** |
| * of_fdt_get_property - Given a node in the given flat blob, return |
| * the property ptr |
| */ |
| void *of_fdt_get_property(struct boot_param_header *blob, |
| unsigned long node, const char *name, |
| unsigned long *size) |
| { |
| unsigned long p = node; |
| |
| do { |
| u32 tag = be32_to_cpup((__be32 *)p); |
| u32 sz, noff; |
| const char *nstr; |
| |
| p += 4; |
| if (tag == OF_DT_NOP) |
| continue; |
| if (tag != OF_DT_PROP) |
| return NULL; |
| |
| sz = be32_to_cpup((__be32 *)p); |
| noff = be32_to_cpup((__be32 *)(p + 4)); |
| p += 8; |
| if (be32_to_cpu(blob->version) < 0x10) |
| p = ALIGN(p, sz >= 8 ? 8 : 4); |
| |
| nstr = of_fdt_get_string(blob, noff); |
| if (nstr == NULL) { |
| pr_warning("Can't find property index name !\n"); |
| return NULL; |
| } |
| if (strcmp(name, nstr) == 0) { |
| if (size) |
| *size = sz; |
| return (void *)p; |
| } |
| p += sz; |
| p = ALIGN(p, 4); |
| } while (1); |
| } |
| |
| /** |
| * of_fdt_is_compatible - Return true if given node from the given blob has |
| * compat in its compatible list |
| * @blob: A device tree blob |
| * @node: node to test |
| * @compat: compatible string to compare with compatible list. |
| * |
| * On match, returns a non-zero value with smaller values returned for more |
| * specific compatible values. |
| */ |
| int of_fdt_is_compatible(struct boot_param_header *blob, |
| unsigned long node, const char *compat) |
| { |
| const char *cp; |
| unsigned long cplen, l, score = 0; |
| |
| cp = of_fdt_get_property(blob, node, "compatible", &cplen); |
| if (cp == NULL) |
| return 0; |
| while (cplen > 0) { |
| score++; |
| if (of_compat_cmp(cp, compat, strlen(compat)) == 0) |
| return score; |
| l = strlen(cp) + 1; |
| cp += l; |
| cplen -= l; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * of_fdt_match - Return true if node matches a list of compatible values |
| */ |
| int of_fdt_match(struct boot_param_header *blob, unsigned long node, |
| const char *const *compat) |
| { |
| unsigned int tmp, score = 0; |
| |
| if (!compat) |
| return 0; |
| |
| while (*compat) { |
| tmp = of_fdt_is_compatible(blob, node, *compat); |
| if (tmp && (score == 0 || (tmp < score))) |
| score = tmp; |
| compat++; |
| } |
| |
| return score; |
| } |
| |
| static void *unflatten_dt_alloc(unsigned long *mem, unsigned long size, |
| unsigned long align) |
| { |
| void *res; |
| |
| *mem = ALIGN(*mem, align); |
| res = (void *)*mem; |
| *mem += size; |
| |
| return res; |
| } |
| |
| /** |
| * unflatten_dt_node - Alloc and populate a device_node from the flat tree |
| * @blob: The parent device tree blob |
| * @mem: Memory chunk to use for allocating device nodes and properties |
| * @p: pointer to node in flat tree |
| * @dad: Parent struct device_node |
| * @allnextpp: pointer to ->allnext from last allocated device_node |
| * @fpsize: Size of the node path up at the current depth. |
| */ |
| static unsigned long unflatten_dt_node(struct boot_param_header *blob, |
| unsigned long mem, |
| unsigned long *p, |
| struct device_node *dad, |
| struct device_node ***allnextpp, |
| unsigned long fpsize) |
| { |
| struct device_node *np; |
| struct property *pp, **prev_pp = NULL; |
| char *pathp; |
| u32 tag; |
| unsigned int l, allocl; |
| int has_name = 0; |
| int new_format = 0; |
| |
| tag = be32_to_cpup((__be32 *)(*p)); |
| if (tag != OF_DT_BEGIN_NODE) { |
| pr_err("Weird tag at start of node: %x\n", tag); |
| return mem; |
| } |
| *p += 4; |
| pathp = (char *)*p; |
| l = allocl = strlen(pathp) + 1; |
| *p = ALIGN(*p + l, 4); |
| |
| /* version 0x10 has a more compact unit name here instead of the full |
| * path. we accumulate the full path size using "fpsize", we'll rebuild |
| * it later. We detect this because the first character of the name is |
| * not '/'. |
| */ |
| if ((*pathp) != '/') { |
| new_format = 1; |
| if (fpsize == 0) { |
| /* root node: special case. fpsize accounts for path |
| * plus terminating zero. root node only has '/', so |
| * fpsize should be 2, but we want to avoid the first |
| * level nodes to have two '/' so we use fpsize 1 here |
| */ |
| fpsize = 1; |
| allocl = 2; |
| l = 1; |
| *pathp = '\0'; |
| } else { |
| /* account for '/' and path size minus terminal 0 |
| * already in 'l' |
| */ |
| fpsize += l; |
| allocl = fpsize; |
| } |
| } |
| |
| np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, |
| __alignof__(struct device_node)); |
| if (allnextpp) { |
| char *fn; |
| memset(np, 0, sizeof(*np)); |
| np->full_name = fn = ((char *)np) + sizeof(*np); |
| if (new_format) { |
| /* rebuild full path for new format */ |
| if (dad && dad->parent) { |
| strcpy(fn, dad->full_name); |
| #ifdef DEBUG |
| if ((strlen(fn) + l + 1) != allocl) { |
| pr_debug("%s: p: %d, l: %d, a: %d\n", |
| pathp, (int)strlen(fn), |
| l, allocl); |
| } |
| #endif |
| fn += strlen(fn); |
| } |
| *(fn++) = '/'; |
| } |
| memcpy(fn, pathp, l); |
| |
| prev_pp = &np->properties; |
| **allnextpp = np; |
| *allnextpp = &np->allnext; |
| if (dad != NULL) { |
| np->parent = dad; |
| /* we temporarily use the next field as `last_child'*/ |
| if (dad->next == NULL) |
| dad->child = np; |
| else |
| dad->next->sibling = np; |
| dad->next = np; |
| } |
| kref_init(&np->kref); |
| } |
| /* process properties */ |
| while (1) { |
| u32 sz, noff; |
| char *pname; |
| |
| tag = be32_to_cpup((__be32 *)(*p)); |
| if (tag == OF_DT_NOP) { |
| *p += 4; |
| continue; |
| } |
| if (tag != OF_DT_PROP) |
| break; |
| *p += 4; |
| sz = be32_to_cpup((__be32 *)(*p)); |
| noff = be32_to_cpup((__be32 *)((*p) + 4)); |
| *p += 8; |
| if (be32_to_cpu(blob->version) < 0x10) |
| *p = ALIGN(*p, sz >= 8 ? 8 : 4); |
| |
| pname = of_fdt_get_string(blob, noff); |
| if (pname == NULL) { |
| pr_info("Can't find property name in list !\n"); |
| break; |
| } |
| if (strcmp(pname, "name") == 0) |
| has_name = 1; |
| l = strlen(pname) + 1; |
| pp = unflatten_dt_alloc(&mem, sizeof(struct property), |
| __alignof__(struct property)); |
| if (allnextpp) { |
| /* We accept flattened tree phandles either in |
| * ePAPR-style "phandle" properties, or the |
| * legacy "linux,phandle" properties. If both |
| * appear and have different values, things |
| * will get weird. Don't do that. */ |
| if ((strcmp(pname, "phandle") == 0) || |
| (strcmp(pname, "linux,phandle") == 0)) { |
| if (np->phandle == 0) |
| np->phandle = be32_to_cpup((__be32*)*p); |
| } |
| /* And we process the "ibm,phandle" property |
| * used in pSeries dynamic device tree |
| * stuff */ |
| if (strcmp(pname, "ibm,phandle") == 0) |
| np->phandle = be32_to_cpup((__be32 *)*p); |
| pp->name = pname; |
| pp->length = sz; |
| pp->value = (void *)*p; |
| *prev_pp = pp; |
| prev_pp = &pp->next; |
| } |
| *p = ALIGN((*p) + sz, 4); |
| } |
| /* with version 0x10 we may not have the name property, recreate |
| * it here from the unit name if absent |
| */ |
| if (!has_name) { |
| char *p1 = pathp, *ps = pathp, *pa = NULL; |
| int sz; |
| |
| while (*p1) { |
| if ((*p1) == '@') |
| pa = p1; |
| if ((*p1) == '/') |
| ps = p1 + 1; |
| p1++; |
| } |
| if (pa < ps) |
| pa = p1; |
| sz = (pa - ps) + 1; |
| pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, |
| __alignof__(struct property)); |
| if (allnextpp) { |
| pp->name = "name"; |
| pp->length = sz; |
| pp->value = pp + 1; |
| *prev_pp = pp; |
| prev_pp = &pp->next; |
| memcpy(pp->value, ps, sz - 1); |
| ((char *)pp->value)[sz - 1] = 0; |
| pr_debug("fixed up name for %s -> %s\n", pathp, |
| (char *)pp->value); |
| } |
| } |
| if (allnextpp) { |
| *prev_pp = NULL; |
| np->name = of_get_property(np, "name", NULL); |
| np->type = of_get_property(np, "device_type", NULL); |
| |
| if (!np->name) |
| np->name = "<NULL>"; |
| if (!np->type) |
| np->type = "<NULL>"; |
| } |
| while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) { |
| if (tag == OF_DT_NOP) |
| *p += 4; |
| else |
| mem = unflatten_dt_node(blob, mem, p, np, allnextpp, |
| fpsize); |
| tag = be32_to_cpup((__be32 *)(*p)); |
| } |
| if (tag != OF_DT_END_NODE) { |
| pr_err("Weird tag at end of node: %x\n", tag); |
| return mem; |
| } |
| *p += 4; |
| return mem; |
| } |
| |
| /** |
| * __unflatten_device_tree - create tree of device_nodes from flat blob |
| * |
| * unflattens a device-tree, 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. |
| * @blob: The blob to expand |
| * @mynodes: The device_node tree created by the call |
| * @dt_alloc: An allocator that provides a virtual address to memory |
| * for the resulting tree |
| */ |
| static void __unflatten_device_tree(struct boot_param_header *blob, |
| struct device_node **mynodes, |
| void * (*dt_alloc)(u64 size, u64 align)) |
| { |
| unsigned long start, mem, size; |
| struct device_node **allnextp = mynodes; |
| |
| pr_debug(" -> unflatten_device_tree()\n"); |
| |
| if (!blob) { |
| pr_debug("No device tree pointer\n"); |
| return; |
| } |
| |
| pr_debug("Unflattening device tree:\n"); |
| pr_debug("magic: %08x\n", be32_to_cpu(blob->magic)); |
| pr_debug("size: %08x\n", be32_to_cpu(blob->totalsize)); |
| pr_debug("version: %08x\n", be32_to_cpu(blob->version)); |
| |
| if (be32_to_cpu(blob->magic) != OF_DT_HEADER) { |
| pr_err("Invalid device tree blob header\n"); |
| return; |
| } |
| |
| /* First pass, scan for size */ |
| start = ((unsigned long)blob) + |
| be32_to_cpu(blob->off_dt_struct); |
| size = unflatten_dt_node(blob, 0, &start, NULL, NULL, 0); |
| size = (size | 3) + 1; |
| |
| pr_debug(" size is %lx, allocating...\n", size); |
| |
| /* Allocate memory for the expanded device tree */ |
| mem = (unsigned long) |
| dt_alloc(size + 4, __alignof__(struct device_node)); |
| |
| memset((void *)mem, 0, size); |
| |
| ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef); |
| |
| pr_debug(" unflattening %lx...\n", mem); |
| |
| /* Second pass, do actual unflattening */ |
| start = ((unsigned long)blob) + |
| be32_to_cpu(blob->off_dt_struct); |
| unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0); |
| if (be32_to_cpup((__be32 *)start) != OF_DT_END) |
| pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start)); |
| if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef) |
| pr_warning("End of tree marker overwritten: %08x\n", |
| be32_to_cpu(((__be32 *)mem)[size / 4])); |
| *allnextp = NULL; |
| |
| pr_debug(" <- unflatten_device_tree()\n"); |
| } |
| |
| static void *kernel_tree_alloc(u64 size, u64 align) |
| { |
| return kzalloc(size, GFP_KERNEL); |
| } |
| |
| /** |
| * of_fdt_unflatten_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 of_fdt_unflatten_tree(unsigned long *blob, |
| struct device_node **mynodes) |
| { |
| struct boot_param_header *device_tree = |
| (struct boot_param_header *)blob; |
| __unflatten_device_tree(device_tree, mynodes, &kernel_tree_alloc); |
| } |
| EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); |
| |
| /* Everything below here references initial_boot_params directly. */ |
| int __initdata dt_root_addr_cells; |
| int __initdata dt_root_size_cells; |
| |
| struct boot_param_header *initial_boot_params; |
| |
| #ifdef CONFIG_OF_EARLY_FLATTREE |
| |
| /** |
| * 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) |
| { |
| unsigned long p = ((unsigned long)initial_boot_params) + |
| be32_to_cpu(initial_boot_params->off_dt_struct); |
| int rc = 0; |
| int depth = -1; |
| |
| do { |
| u32 tag = be32_to_cpup((__be32 *)p); |
| const char *pathp; |
| |
| p += 4; |
| if (tag == OF_DT_END_NODE) { |
| depth--; |
| continue; |
| } |
| if (tag == OF_DT_NOP) |
| continue; |
| if (tag == OF_DT_END) |
| break; |
| if (tag == OF_DT_PROP) { |
| u32 sz = be32_to_cpup((__be32 *)p); |
| p += 8; |
| if (be32_to_cpu(initial_boot_params->version) < 0x10) |
| p = ALIGN(p, sz >= 8 ? 8 : 4); |
| p += sz; |
| p = ALIGN(p, 4); |
| continue; |
| } |
| if (tag != OF_DT_BEGIN_NODE) { |
| pr_err("Invalid tag %x in flat device tree!\n", tag); |
| return -EINVAL; |
| } |
| depth++; |
| pathp = (char *)p; |
| p = ALIGN(p + strlen(pathp) + 1, 4); |
| if (*pathp == '/') |
| pathp = kbasename(pathp); |
| rc = it(p, pathp, depth, data); |
| if (rc != 0) |
| break; |
| } while (1); |
| |
| return rc; |
| } |
| |
| /** |
| * of_get_flat_dt_root - find the root node in the flat blob |
| */ |
| unsigned long __init of_get_flat_dt_root(void) |
| { |
| unsigned long p = ((unsigned long)initial_boot_params) + |
| be32_to_cpu(initial_boot_params->off_dt_struct); |
| |
| while (be32_to_cpup((__be32 *)p) == OF_DT_NOP) |
| p += 4; |
| BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE); |
| p += 4; |
| return ALIGN(p + strlen((char *)p) + 1, 4); |
| } |
| |
| /** |
| * 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 |
| */ |
| void *__init of_get_flat_dt_prop(unsigned long node, const char *name, |
| unsigned long *size) |
| { |
| return of_fdt_get_property(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); |
| } |
| |
| #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; |
| unsigned long len; |
| __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 */ |
| |
| /** |
| * 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) |
| { |
| __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, __be32 **cellp) |
| { |
| __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) |
| { |
| char *type = of_get_flat_dt_prop(node, "device_type", NULL); |
| __be32 *reg, *endp; |
| unsigned long 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 (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 %ld, 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; |
| } |
| |
| /* |
| * Convert configs to something easy to use in C code |
| */ |
| #if defined(CONFIG_CMDLINE_FORCE) |
| static const int overwrite_incoming_cmdline = 1; |
| static const int read_dt_cmdline; |
| static const int concat_cmdline; |
| #elif defined(CONFIG_CMDLINE_EXTEND) |
| static const int overwrite_incoming_cmdline; |
| static const int read_dt_cmdline = 1; |
| static const int concat_cmdline = 1; |
| #else /* CMDLINE_FROM_BOOTLOADER */ |
| static const int overwrite_incoming_cmdline; |
| static const int read_dt_cmdline = 1; |
| static const int concat_cmdline; |
| #endif |
| |
| #ifdef CONFIG_CMDLINE |
| static const char *config_cmdline = CONFIG_CMDLINE; |
| #else |
| static const char *config_cmdline = ""; |
| #endif |
| |
| int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, |
| int depth, void *data) |
| { |
| unsigned long l = 0; |
| char *p = NULL; |
| char *cmdline = data; |
| |
| pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); |
| |
| if (depth != 1 || !cmdline || |
| (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) |
| return 0; |
| |
| early_init_dt_check_for_initrd(node); |
| |
| /* Put CONFIG_CMDLINE in if forced or if data had nothing in it to start */ |
| if (overwrite_incoming_cmdline || !cmdline[0]) |
| strlcpy(cmdline, config_cmdline, COMMAND_LINE_SIZE); |
| |
| /* Retrieve command line unless forcing */ |
| if (read_dt_cmdline) |
| p = of_get_flat_dt_prop(node, "bootargs", &l); |
| |
| if (p != NULL && l > 0) { |
| if (concat_cmdline) { |
| int cmdline_len; |
| int copy_len; |
| strlcat(cmdline, " ", COMMAND_LINE_SIZE); |
| cmdline_len = strlen(cmdline); |
| copy_len = COMMAND_LINE_SIZE - cmdline_len - 1; |
| copy_len = min((int)l, copy_len); |
| strncpy(cmdline + cmdline_len, p, copy_len); |
| cmdline[cmdline_len + copy_len] = '\0'; |
| } else { |
| strlcpy(cmdline, p, min((int)l, COMMAND_LINE_SIZE)); |
| } |
| } |
| |
| 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 (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); |
| } |
| |
| /* |
| * 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)); |
| } |
| #endif |
| |
| bool __init early_init_dt_scan(void *params) |
| { |
| if (!params) |
| return false; |
| |
| /* Setup flat device-tree pointer */ |
| initial_boot_params = params; |
| |
| /* check device tree validity */ |
| if (be32_to_cpu(initial_boot_params->magic) != OF_DT_HEADER) { |
| initial_boot_params = NULL; |
| return false; |
| } |
| |
| /* 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); |
| |
| 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 "/aliasas" nodes for use everywhere */ |
| of_alias_scan(early_init_dt_alloc_memory_arch); |
| } |
| |
| #endif /* CONFIG_OF_EARLY_FLATTREE */ |