Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * libfdt - Flat Device Tree manipulation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2006 David Gibson, IBM Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include "libfdt_env.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <fdt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <libfdt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include "libfdt_internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) static int fdt_sw_probe_(void *fdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 	if (!can_assume(VALID_INPUT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 		if (fdt_magic(fdt) == FDT_MAGIC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 			return -FDT_ERR_BADSTATE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 		else if (fdt_magic(fdt) != FDT_SW_MAGIC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 			return -FDT_ERR_BADMAGIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define FDT_SW_PROBE(fdt) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	{ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 		int err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 		if ((err = fdt_sw_probe_(fdt)) != 0) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 			return err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) /* 'memrsv' state:	Initial state after fdt_create()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34)  * Allowed functions:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35)  *	fdt_add_reservemap_entry()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36)  *	fdt_finish_reservemap()		[moves to 'struct' state]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static int fdt_sw_probe_memrsv_(void *fdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	int err = fdt_sw_probe_(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	if (!can_assume(VALID_INPUT) && fdt_off_dt_strings(fdt) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		return -FDT_ERR_BADSTATE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) #define FDT_SW_PROBE_MEMRSV(fdt) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	{ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		int err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		if ((err = fdt_sw_probe_memrsv_(fdt)) != 0) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 			return err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) /* 'struct' state:	Enter this state after fdt_finish_reservemap()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58)  * Allowed functions:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  *	fdt_begin_node()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60)  *	fdt_end_node()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61)  *	fdt_property*()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62)  *	fdt_finish()			[moves to 'complete' state]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) static int fdt_sw_probe_struct_(void *fdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	int err = fdt_sw_probe_(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if (!can_assume(VALID_INPUT) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	    fdt_off_dt_strings(fdt) != fdt_totalsize(fdt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		return -FDT_ERR_BADSTATE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) #define FDT_SW_PROBE_STRUCT(fdt) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	{ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		int err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		if ((err = fdt_sw_probe_struct_(fdt)) != 0) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			return err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) static inline uint32_t sw_flags(void *fdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	/* assert: (fdt_magic(fdt) == FDT_SW_MAGIC) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	return fdt_last_comp_version(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) /* 'complete' state:	Enter this state after fdt_finish()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91)  * Allowed functions: none
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) static void *fdt_grab_space_(void *fdt, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	unsigned int offset = fdt_size_dt_struct(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	unsigned int spaceleft;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	spaceleft = fdt_totalsize(fdt) - fdt_off_dt_struct(fdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		- fdt_size_dt_strings(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if ((offset + len < offset) || (offset + len > spaceleft))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	fdt_set_size_dt_struct(fdt, offset + len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	return fdt_offset_ptr_w_(fdt, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) int fdt_create_with_flags(void *buf, int bufsize, uint32_t flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	const int hdrsize = FDT_ALIGN(sizeof(struct fdt_header),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 				      sizeof(struct fdt_reserve_entry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	void *fdt = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (bufsize < hdrsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		return -FDT_ERR_NOSPACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	if (flags & ~FDT_CREATE_FLAGS_ALL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		return -FDT_ERR_BADFLAGS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	memset(buf, 0, bufsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	 * magic and last_comp_version keep intermediate state during the fdt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	 * creation process, which is replaced with the proper FDT format by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	 * fdt_finish().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	 * flags should be accessed with sw_flags().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	fdt_set_magic(fdt, FDT_SW_MAGIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	fdt_set_version(fdt, FDT_LAST_SUPPORTED_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	fdt_set_last_comp_version(fdt, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	fdt_set_totalsize(fdt,  bufsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	fdt_set_off_mem_rsvmap(fdt, hdrsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	fdt_set_off_dt_struct(fdt, fdt_off_mem_rsvmap(fdt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	fdt_set_off_dt_strings(fdt, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) int fdt_create(void *buf, int bufsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	return fdt_create_with_flags(buf, bufsize, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) int fdt_resize(void *fdt, void *buf, int bufsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	size_t headsize, tailsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	char *oldtail, *newtail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	FDT_SW_PROBE(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	if (bufsize < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		return -FDT_ERR_NOSPACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	headsize = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	tailsize = fdt_size_dt_strings(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	if (!can_assume(VALID_DTB) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	    headsize + tailsize > fdt_totalsize(fdt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		return -FDT_ERR_INTERNAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	if ((headsize + tailsize) > (unsigned)bufsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		return -FDT_ERR_NOSPACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	oldtail = (char *)fdt + fdt_totalsize(fdt) - tailsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	newtail = (char *)buf + bufsize - tailsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	/* Two cases to avoid clobbering data if the old and new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	 * buffers partially overlap */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	if (buf <= fdt) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		memmove(buf, fdt, headsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		memmove(newtail, oldtail, tailsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		memmove(newtail, oldtail, tailsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		memmove(buf, fdt, headsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	fdt_set_totalsize(buf, bufsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	if (fdt_off_dt_strings(buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		fdt_set_off_dt_strings(buf, bufsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	struct fdt_reserve_entry *re;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	int offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	FDT_SW_PROBE_MEMRSV(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	offset = fdt_off_dt_struct(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	if ((offset + sizeof(*re)) > fdt_totalsize(fdt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		return -FDT_ERR_NOSPACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	re = (struct fdt_reserve_entry *)((char *)fdt + offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	re->address = cpu_to_fdt64(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	re->size = cpu_to_fdt64(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	fdt_set_off_dt_struct(fdt, offset + sizeof(*re));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) int fdt_finish_reservemap(void *fdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	int err = fdt_add_reservemap_entry(fdt, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	fdt_set_off_dt_strings(fdt, fdt_totalsize(fdt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) int fdt_begin_node(void *fdt, const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	struct fdt_node_header *nh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	int namelen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	FDT_SW_PROBE_STRUCT(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	namelen = strlen(name) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	nh = fdt_grab_space_(fdt, sizeof(*nh) + FDT_TAGALIGN(namelen));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (! nh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		return -FDT_ERR_NOSPACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	memcpy(nh->name, name, namelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) int fdt_end_node(void *fdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	fdt32_t *en;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	FDT_SW_PROBE_STRUCT(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	en = fdt_grab_space_(fdt, FDT_TAGSIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	if (! en)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		return -FDT_ERR_NOSPACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	*en = cpu_to_fdt32(FDT_END_NODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) static int fdt_add_string_(void *fdt, const char *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	char *strtab = (char *)fdt + fdt_totalsize(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	unsigned int strtabsize = fdt_size_dt_strings(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	unsigned int len = strlen(s) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	unsigned int struct_top, offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	offset = strtabsize + len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	struct_top = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	if (fdt_totalsize(fdt) - offset < struct_top)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		return 0; /* no more room :( */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	memcpy(strtab - offset, s, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	fdt_set_size_dt_strings(fdt, strtabsize + len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	return -offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /* Must only be used to roll back in case of error */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) static void fdt_del_last_string_(void *fdt, const char *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	int strtabsize = fdt_size_dt_strings(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	int len = strlen(s) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	fdt_set_size_dt_strings(fdt, strtabsize - len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) static int fdt_find_add_string_(void *fdt, const char *s, int *allocated)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	char *strtab = (char *)fdt + fdt_totalsize(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	int strtabsize = fdt_size_dt_strings(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	const char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	*allocated = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	p = fdt_find_string_(strtab - strtabsize, strtabsize, s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	if (p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		return p - strtab;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	*allocated = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	return fdt_add_string_(fdt, s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	struct fdt_property *prop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	int nameoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	int allocated;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	FDT_SW_PROBE_STRUCT(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	/* String de-duplication can be slow, _NO_NAME_DEDUP skips it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	if (sw_flags(fdt) & FDT_CREATE_FLAG_NO_NAME_DEDUP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 		allocated = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		nameoff = fdt_add_string_(fdt, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		nameoff = fdt_find_add_string_(fdt, name, &allocated);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	if (nameoff == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		return -FDT_ERR_NOSPACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	prop = fdt_grab_space_(fdt, sizeof(*prop) + FDT_TAGALIGN(len));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	if (! prop) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		if (allocated)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 			fdt_del_last_string_(fdt, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		return -FDT_ERR_NOSPACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	prop->tag = cpu_to_fdt32(FDT_PROP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	prop->nameoff = cpu_to_fdt32(nameoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	prop->len = cpu_to_fdt32(len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	*valp = prop->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) int fdt_property(void *fdt, const char *name, const void *val, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	void *ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	ret = fdt_property_placeholder(fdt, name, len, &ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	memcpy(ptr, val, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) int fdt_finish(void *fdt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	char *p = (char *)fdt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	fdt32_t *end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	int oldstroffset, newstroffset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	uint32_t tag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	int offset, nextoffset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	FDT_SW_PROBE_STRUCT(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	/* Add terminator */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	end = fdt_grab_space_(fdt, sizeof(*end));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	if (! end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		return -FDT_ERR_NOSPACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	*end = cpu_to_fdt32(FDT_END);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	/* Relocate the string table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	oldstroffset = fdt_totalsize(fdt) - fdt_size_dt_strings(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	newstroffset = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	memmove(p + newstroffset, p + oldstroffset, fdt_size_dt_strings(fdt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	fdt_set_off_dt_strings(fdt, newstroffset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	/* Walk the structure, correcting string offsets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	while ((tag = fdt_next_tag(fdt, offset, &nextoffset)) != FDT_END) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		if (tag == FDT_PROP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 			struct fdt_property *prop =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 				fdt_offset_ptr_w_(fdt, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 			int nameoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 			nameoff = fdt32_to_cpu(prop->nameoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 			nameoff += fdt_size_dt_strings(fdt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 			prop->nameoff = cpu_to_fdt32(nameoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 		offset = nextoffset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	if (nextoffset < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		return nextoffset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	/* Finally, adjust the header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	fdt_set_totalsize(fdt, newstroffset + fdt_size_dt_strings(fdt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	/* And fix up fields that were keeping intermediate state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	fdt_set_last_comp_version(fdt, FDT_LAST_COMPATIBLE_VERSION);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	fdt_set_magic(fdt, FDT_MAGIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }