1 // SPDX-License-Identifier: GPL-2.0-or-later
6  * Copyright (C) 1996-2005 Paul Mackerras.
8  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
31 #include <asm/rtas.h>
42 #include <asm/asm-prototypes.h>
43 #include <asm/ultravisor-api.h>
68  * On ppc32 we compile with -mrelocatable, which means that references
78  * ADDR is used in calls to call_prom.  The 4th and following
79  * arguments to call_prom should be 32-bit values.
187 /* Platforms codes are now obsolete in the kernel. Now only used within this
218  * Error results ... some OF calls will return "-1" on error, some
224 #define PROM_ERROR		(-1u)
238 			return c1 < c2 ? -1 : 1;  in prom_strcmp()
262 			return c1 < c2 ? -1 : 1;  in prom_strncmp()
265 		count--;  in prom_strncmp()
276 	return sc - s;  in prom_strlen()
284 	for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)  in prom_memcmp()
285 		if ((res = *su1 - *su2) != 0)  in prom_memcmp()
299 		l1--;  in prom_strstr()
318 	count -= dsize;  in prom_strlcat()
320 		len = count-1;  in prom_strlcat()
331 		return -EINVAL;  in prom_strtobool()
362 	return -EINVAL;  in prom_strtobool()
418 			rets[i-1] = be32_to_cpu(args.args[nargs+i]);  in call_prom_ret()
435 			call_prom("write", 3, 1, prom.stdout, p, q - p);  in prom_print()
453 	for (i = nibbles-1;  i >= 0;  i--) {  in prom_print_hex()
456 			buf[i] += ('a'-'0'-10);  in prom_print_hex()
470 	for (i = UL_DIGITS-1; i >= 0;  i--) {  in prom_print_dec()
477 	size = UL_DIGITS - i;  in prom_print_dec()
495 			call_prom("write", 3, 1, prom.stdout, p, q - p);  in prom_printf()
564 				prom_print("-");  in prom_printf()
565 				vs = -vs;  in prom_printf()
587 		ret = call_prom_ret("call-method", 5, 2, &result,  in prom_claim()
590 		if (ret != 0 || result == -1)  in prom_claim()
591 			return -1;  in prom_claim()
592 		ret = call_prom_ret("call-method", 5, 2, &result,  in prom_claim()
596 			call_prom("call-method", 4, 1, ADDR("release"),  in prom_claim()
598 			return -1;  in prom_claim()
601 		call_prom("call-method", 6, 1,  in prom_claim()
613 	 * it also causes some sort of double-fault on early pmacs */  in prom_panic()
673 		--i;  in tohex()
709 #define toupper(c)	(islower(c) ? ((c) - 'a' + 'A') : (c))
725 	       (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) {  in prom_strtoul()
764  * Early parsing of the command line passed to the kernel, used for
778 		l = prom_getprop(prom.chosen, "bootargs", p, COMMAND_LINE_SIZE-1);  in early_cmdline_parse()
845 		opt += sizeof("svm=") - 1;  in early_cmdline_parse()
855  * followed by # option vectors - 1, followed by the option vectors.
861 /* Firmware expects the value to be n - 1, where n is the # of vectors */
862 #define NUM_VECTORS(n)		((n) - 1)
865  * Firmware expects 1 + n - 2, where n is the length of the option vector in
866  * bytes. The 1 accounts for the length byte itself, the - 2 .. ?
868 #define VECTOR_LENGTH(n)	(1 + (n) - 2)
988 			.mask = cpu_to_be32(0xffffffff), /* all 3.1-compliant */
992 			.mask = cpu_to_be32(0xffffffff), /* all 3.00-compliant */
996 			.mask = cpu_to_be32(0xffffffff), /* all 2.07-compliant */
1000 			.mask = cpu_to_be32(0xffffffff), /* all 2.06-compliant */
1004 			.mask = cpu_to_be32(0xffffffff), /* all 2.05-compliant */
1008 			.mask = cpu_to_be32(0xfffffffe), /* all 2.04-compliant and earlier */
1101 /* Old method - ELF header with PT_NOTE sections only works on BE */
1124 		char	name[24];	/* "IBM,RPA-Client-Config" */
1173 		.namesz = sizeof("IBM,RPA-Client-Config"),
1176 		.name = "IBM,RPA-Client-Config",
1208 		plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s");  in prom_count_smt_threads()
1234 		prom_debug("MMU - either supported\n");  in prom_parse_mmu_model()
1235 		support->radix_mmu = !prom_radix_disable;  in prom_parse_mmu_model()
1236 		support->hash_mmu = true;  in prom_parse_mmu_model()
1239 		prom_debug("MMU - radix only\n");  in prom_parse_mmu_model()
1247 		support->radix_mmu = true;  in prom_parse_mmu_model()
1250 		prom_debug("MMU - hash only\n");  in prom_parse_mmu_model()
1251 		support->hash_mmu = true;  in prom_parse_mmu_model()
1264 		prom_debug("XIVE - either mode supported\n");  in prom_parse_xive_model()
1265 		support->xive = !prom_xive_disable;  in prom_parse_xive_model()
1268 		prom_debug("XIVE - exploitation mode supported\n");  in prom_parse_xive_model()
1276 		support->xive = true;  in prom_parse_xive_model()
1279 		prom_debug("XIVE - legacy mode supported\n");  in prom_parse_xive_model()
1296 			support->radix_gtse = !prom_radix_gtse_disable;  in prom_parse_platform_support()
1314 				       "ibm,arch-vec-5-platform-support");  in prom_check_platform_support()
1320 	 * by __memcpy() when KASAN is active  in prom_check_platform_support()
1328 		prom_debug("Found ibm,arch-vec-5-platform-support, len: %d\n",  in prom_check_platform_support()
1331 			prom_printf("WARNING: ibm,arch-vec-5-platform-support longer than expected (len: %d)\n",  in prom_check_platform_support()
1333 		prom_getprop(prom.chosen, "ibm,arch-vec-5-platform-support",  in prom_check_platform_support()
1345 		/* Radix preferred - Check if GTSE is also supported */  in prom_check_platform_support()
1374 	/* Check ibm,arch-vec-5-platform-support and fixup vec5 if required */  in prom_send_capabilities()
1392 		/* try calling the ibm,client-architecture-support method */  in prom_send_capabilities()
1393 		prom_printf("Calling ibm,client-architecture-support...");  in prom_send_capabilities()
1394 		if (call_prom_ret("call-method", 3, 2, &ret,  in prom_send_capabilities()
1395 				  ADDR("ibm,client-architecture-support"),  in prom_send_capabilities()
1400 				prom_printf("\nWARNING: ibm,client-architecture"  in prom_send_capabilities()
1401 					    "-support call FAILED!\n");  in prom_send_capabilities()
1414 		/* no ibm,client-architecture-support call, try the old way */  in prom_send_capabilities()
1416 				      ADDR("/packages/elf-loader"));  in prom_send_capabilities()
1418 			prom_printf("couldn't open /packages/elf-loader\n");  in prom_send_capabilities()
1421 		call_prom("call-method", 3, 1, ADDR("process-elf-header"),  in prom_send_capabilities()
1443  *  from there, allocations are done this way : rtas is allocated
1444  *  topmost, and the device-tree is allocated from the bottom. We try
1445  *  to grow the device-tree allocation as we progress. If we can't,
1460  * extending the previous allocation). Used for the device-tree flattening
1492 	prom_debug(" -> %lx\n", addr);  in alloc_up()
1519 		addr = ALIGN_DOWN(alloc_top_high - size, align);  in alloc_down()
1537 	base = ALIGN_DOWN(alloc_top - size, align);  in alloc_down()
1539 	     base = ALIGN_DOWN(base - 0x100000, align))  {  in alloc_down()
1551 	prom_debug(" -> %lx\n", addr);  in alloc_down()
1572 		s--;  in prom_next_cell()
1607 	size = top - base;  in reserve_mem()
1609 	if (cnt >= (MEM_RESERVE_MAP_SIZE - 1))  in reserve_mem()
1635 	prom_getprop(prom.root, "#address-cells", &val, sizeof(val));  in prom_init_mem()
1638 	prom_getprop(prom.root, "#size-cells", &val, sizeof(rsc));  in prom_init_mem()
1669 		call_prom("package-to-path", 3, 1, node, prom_scratch,  in prom_init_mem()
1670 			  sizeof(prom_scratch) - 1);  in prom_init_mem()
1674 		while ((endp - p) >= (rac + rsc)) {  in prom_init_mem()
1717 	 * segment 0 when running non-LPAR.  in prom_init_mem()
1721 	 * reasonable on 32-bit, cap at 768MB on all machines.  in prom_init_mem()
1780 	rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));  in prom_rtas_os_term()
1786 	prom_getprop(rtas_node, "ibm,os-term", &val, sizeof(val));  in prom_rtas_os_term()
1788 	prom_debug("ibm,os-term: %x\n", token);  in prom_rtas_os_term()
1790 		prom_panic("Could not get token for ibm,os-term\n");  in prom_rtas_os_term()
1800  * Allocate room for and instantiate RTAS
1812 	rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas"));  in prom_instantiate_rtas()
1818 	prom_getprop(rtas_node, "rtas-size", &val, sizeof(size));  in prom_instantiate_rtas()
1825 		prom_panic("Could not allocate memory for RTAS\n");  in prom_instantiate_rtas()
1827 	rtas_inst = call_prom("open", 1, 1, ADDR("/rtas"));  in prom_instantiate_rtas()
1829 		prom_printf("opening rtas package failed (%x)\n", rtas_inst);  in prom_instantiate_rtas()
1833 	prom_printf("instantiating rtas at 0x%x...", base);  in prom_instantiate_rtas()
1835 	if (call_prom_ret("call-method", 3, 2, &entry,  in prom_instantiate_rtas()
1836 			  ADDR("instantiate-rtas"),  in prom_instantiate_rtas()
1847 	prom_setprop(rtas_node, "/rtas", "linux,rtas-base",  in prom_instantiate_rtas()
1850 	prom_setprop(rtas_node, "/rtas", "linux,rtas-entry",  in prom_instantiate_rtas()
1853 	/* Check if it supports "query-cpu-stopped-state" */  in prom_instantiate_rtas()
1854 	if (prom_getprop(rtas_node, "query-cpu-stopped-state",  in prom_instantiate_rtas()
1858 	prom_debug("rtas base     = 0x%x\n", base);  in prom_instantiate_rtas()
1859 	prom_debug("rtas entry    = 0x%x\n", entry);  in prom_instantiate_rtas()
1860 	prom_debug("rtas size     = 0x%x\n", size);  in prom_instantiate_rtas()
1890 	if (prom_getprop(ibmvtpm_node, "ibm,sml-efi-reformat-supported",  in prom_instantiate_sml()
1892 		if (call_prom_ret("call-method", 2, 2, &succ,  in prom_instantiate_sml()
1893 				  ADDR("reformat-sml-to-efi-alignment"),  in prom_instantiate_sml()
1899 		if (call_prom_ret("call-method", 2, 2, &size,  in prom_instantiate_sml()
1900 				  ADDR("sml-get-allocated-size"),  in prom_instantiate_sml()
1906 		if (call_prom_ret("call-method", 2, 2, &size,  in prom_instantiate_sml()
1907 				  ADDR("sml-get-handover-size"),  in prom_instantiate_sml()
1922 	if (call_prom_ret("call-method", 4, 2, &entry,  in prom_instantiate_sml()
1923 			  ADDR("sml-handover"),  in prom_instantiate_sml()
1932 	prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-base",  in prom_instantiate_sml()
1934 	prom_setprop(ibmvtpm_node, "/vdevice/vtpm", "linux,sml-size",  in prom_instantiate_sml()
1994 		if (prom_getprop(node, "tce-table-minalign", &minalign,  in prom_initialize_tce_table()
1997 		if (prom_getprop(node, "tce-table-minsize", &minsize,  in prom_initialize_tce_table()
2004 		 * By doing this, we avoid the pitfalls of trying to DMA to  in prom_initialize_tce_table()
2017 		/* It seems OF doesn't null-terminate the path :-( */  in prom_initialize_tce_table()
2020 		if (call_prom("package-to-path", 3, 1, node,  in prom_initialize_tce_table()
2021 			      path, sizeof(prom_scratch) - 1) == PROM_ERROR) {  in prom_initialize_tce_table()
2022 			prom_printf("package-to-path failed\n");  in prom_initialize_tce_table()
2026 		prom_setprop(node, path, "linux,tce-base", &base, sizeof(base));  in prom_initialize_tce_table()
2027 		prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize));  in prom_initialize_tce_table()
2034 		/* Initialize the table to have a one-to-one mapping  in prom_initialize_tce_table()
2051 		call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"),  in prom_initialize_tce_table()
2052 			  phb_node, -1, minsize,  in prom_initialize_tce_table()
2057 	reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom);  in prom_initialize_tce_table()
2072  * We can't wait until smp_boot_cpus (the OF is trashed by then)
2074  * by the kernel (not OF) before we destroy the OF.
2086  * -- Cort
2090  * 0 - 0x100 address range
2106 	 * On pseries, if RTAS supports "query-cpu-stopped-state",  in prom_hold_cpus()
2107 	 * we skip this stage, the CPUs will be started by the  in prom_hold_cpus()
2108 	 * kernel using RTAS.  in prom_hold_cpus()
2142 		/* Skip non-configured cpus. */  in prom_hold_cpus()
2147 		reg = cpu_to_be32(-1); /* make sparse happy */  in prom_hold_cpus()
2153 		/* Init the acknowledge var which will be reset by  in prom_hold_cpus()
2157 		*acknowledge = (unsigned long)-1;  in prom_hold_cpus()
2160 			/* Primary Thread of non-boot cpu or any thread */  in prom_hold_cpus()
2162 			call_prom("start-cpu", 3, 0, node,  in prom_hold_cpus()
2166 			     (*acknowledge == ((unsigned long)-1)); i++ )  in prom_hold_cpus()
2218 	version[sizeof(version) - 1] = 0;  in prom_find_mmu()
2224 		call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim");  in prom_find_mmu()
2252 	call_prom("instance-to-path", 3, 1, prom.stdout, path, 255);  in prom_init_stdout()
2254 	prom_setprop(prom.chosen, "/chosen", "linux,stdout-path",  in prom_init_stdout()
2257 	/* instance-to-package fails on PA-Semi */  in prom_init_stdout()
2258 	stdout_node = call_prom("instance-to-package", 1, 1, prom.stdout);  in prom_init_stdout()
2266 			prom_setprop(stdout_node, path, "linux,boot-display", NULL, 0);  in prom_init_stdout()
2275 	phandle rtas;  in prom_find_machine_type()  local
2281 			   compat, sizeof(compat)-1);  in prom_find_machine_type()
2298 			    prom_strstr(p, "IBM,CPBW-1.0"))  in prom_find_machine_type()
2307 	 *  - /device_type is "chrp" (please, do NOT use that for future  in prom_find_machine_type()
2308 	 *    non-IBM designs !  in prom_find_machine_type()
2309 	 *  - it has /rtas  in prom_find_machine_type()
2312 			   compat, sizeof(compat)-1);  in prom_find_machine_type()
2319 	rtas = call_prom("finddevice", 1, 1, ADDR("/rtas"));  in prom_find_machine_type()
2320 	if (!PHANDLE_VALID(rtas))  in prom_find_machine_type()
2322 	x = prom_getproplen(rtas, "ibm,hypertas-functions");  in prom_find_machine_type()
2335 	return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r);  in prom_set_color()
2380 		/* It seems OF doesn't null-terminate the path :-( */  in prom_check_displays()
2388 		if (call_prom("package-to-path", 3, 1, node, path,  in prom_check_displays()
2389 			      sizeof(prom_scratch) - 10) == PROM_ERROR)  in prom_check_displays()
2404 		 * method is available. Should update this to set-colors */  in prom_check_displays()
2420 		if (prom_getprop(node, "linux,boot-display", NULL, 0) !=  in prom_check_displays()
2460 		room = alloc_top - alloc_bottom;  in make_room()
2492 			return s - os;  in dt_find_string()
2566 	room = *mem_end - *mem_start;  in scan_dt_build_struct()
2569 	l = call_prom("package-to-path", 3, 1, node, namep, room);  in scan_dt_build_struct()
2573 			if (l >= *mem_end - *mem_start)  in scan_dt_build_struct()
2575 			call_prom("package-to-path", 3, 1, node, namep, l);  in scan_dt_build_struct()
2596 	call_prom("package-to-path", 3, 1, node, path, sizeof(prom_scratch) - 1);  in scan_dt_build_struct()
2675 	 * Check how much room we have between alloc top & bottom (+/- a  in flatten_device_tree()
2678 	room = alloc_top - alloc_bottom - 0x4000;  in flatten_device_tree()
2686 		prom_panic("Can't allocate initial device-tree chunk\n");  in flatten_device_tree()
2725 	hdr->boot_cpuid_phys = cpu_to_be32(prom.cpu);  in flatten_device_tree()
2726 	hdr->magic = cpu_to_be32(OF_DT_HEADER);  in flatten_device_tree()
2727 	hdr->totalsize = cpu_to_be32(dt_struct_end - dt_header_start);  in flatten_device_tree()
2728 	hdr->off_dt_struct = cpu_to_be32(dt_struct_start - dt_header_start);  in flatten_device_tree()
2729 	hdr->off_dt_strings = cpu_to_be32(dt_string_start - dt_header_start);  in flatten_device_tree()
2730 	hdr->dt_strings_size = cpu_to_be32(dt_string_end - dt_string_start);  in flatten_device_tree()
2731 	hdr->off_mem_rsvmap = cpu_to_be32(((unsigned long)rsvmap) - dt_header_start);  in flatten_device_tree()
2732 	hdr->version = cpu_to_be32(OF_DT_VERSION);  in flatten_device_tree()
2734 	hdr->last_comp_version = cpu_to_be32(0x10);  in flatten_device_tree()
2744 			prom_printf("  %llx - %llx\n",  in flatten_device_tree()
2754 	prom_printf("Device tree strings 0x%lx -> 0x%lx\n",  in flatten_device_tree()
2756 	prom_printf("Device tree struct  0x%lx -> 0x%lx\n",  in flatten_device_tree()
2805 /* The values for memory-controller don't have right number of cells */
2820 	prom_getprop(prom.root, "#address-cells", &ac, sizeof(ac));  in fixup_device_tree_maple_memory_controller()
2821 	prom_getprop(prom.root, "#size-cells", &sc, sizeof(sc));  in fixup_device_tree_maple_memory_controller()
2887 		prom_printf("Fixing up IDE class-code on Pegasos...\n");  in fixup_device_tree_chrp()
2888 		rc = prom_getprop(ph, "class-code", prop, sizeof(u32));  in fixup_device_tree_chrp()
2891 			prom_setprop(ph, name, "class-code", prop, sizeof(u32));  in fixup_device_tree_chrp()
2919 	if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev))  in fixup_device_tree_pmac()
2936 	prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent",  in fixup_device_tree_pmac()
2945  * The MPC5200 FEC driver requires an phy-handle property to tell it how
2946  * to talk to the phy.  If the phy-handle property is missing, then this
2956 	/* Check if /builtin/ethernet exists - bail if it doesn't */  in fixup_device_tree_efika_add_phy()
2961 	/* Check if the phy-handle property exists - bail if it does */  in fixup_device_tree_efika_add_phy()
2962 	rv = prom_getprop(node, "phy-handle", prop, sizeof(prop));  in fixup_device_tree_efika_add_phy()
2971 	/* Check for an MDIO bus node - if missing then create one */  in fixup_device_tree_efika_add_phy()
2976 			" s\" /builtin\" find-device"  in fixup_device_tree_efika_add_phy()
2977 			" new-device"  in fixup_device_tree_efika_add_phy()
2978 				" 1 encode-int s\" #address-cells\" property"  in fixup_device_tree_efika_add_phy()
2979 				" 0 encode-int s\" #size-cells\" property"  in fixup_device_tree_efika_add_phy()
2980 				" s\" mdio\" device-name"  in fixup_device_tree_efika_add_phy()
2981 				" s\" fsl,mpc5200b-mdio\" encode-string"  in fixup_device_tree_efika_add_phy()
2984 				" 0x2 encode-int"  in fixup_device_tree_efika_add_phy()
2985 				" 0x5 encode-int encode+"  in fixup_device_tree_efika_add_phy()
2986 				" 0x3 encode-int encode+"  in fixup_device_tree_efika_add_phy()
2988 			" finish-device");  in fixup_device_tree_efika_add_phy()
2991 	/* Check for a PHY device node - if missing then create one and  in fixup_device_tree_efika_add_phy()
2994 			 ADDR("/builtin/mdio/ethernet-phy"));  in fixup_device_tree_efika_add_phy()
2998 			" s\" /builtin/mdio\" find-device"  in fixup_device_tree_efika_add_phy()
2999 			" new-device"  in fixup_device_tree_efika_add_phy()
3000 				" s\" ethernet-phy\" device-name"  in fixup_device_tree_efika_add_phy()
3001 				" 0x10 encode-int s\" reg\" property"  in fixup_device_tree_efika_add_phy()
3002 				" my-self"  in fixup_device_tree_efika_add_phy()
3004 			" finish-device"  in fixup_device_tree_efika_add_phy()
3005 			" s\" /builtin/ethernet\" find-device"  in fixup_device_tree_efika_add_phy()
3006 				" encode-int"  in fixup_device_tree_efika_add_phy()
3007 				" s\" phy-handle\" property"  in fixup_device_tree_efika_add_phy()
3008 			" device-end");  in fixup_device_tree_efika_add_phy()
3072 	/* Make sure ethernet phy-handle property exists */  in fixup_device_tree_efika()
3083  * Add an interrupt-controller property for the io-bridge to use
3098 	/* check if interrupt-controller node set yet */  in fixup_device_tree_pasemi()
3099 	if (prom_getproplen(iob, "interrupt-controller") !=PROM_ERROR)  in fixup_device_tree_pasemi()
3102 	prom_printf("adding interrupt-controller property for SB600...\n");  in fixup_device_tree_pasemi()
3104 	prom_setprop(iob, name, "interrupt-controller", &val, 0);  in fixup_device_tree_pasemi()
3123 		/* found a node, update both interrupts and interrupt-parent */  in fixup_device_tree_pasemi()
3125 			interrupts[0] -= 203;  in fixup_device_tree_pasemi()
3127 			interrupts[0] -= 213;  in fixup_device_tree_pasemi()
3135 		prom_setprop(node, pci_name, "interrupt-parent", &parent,  in fixup_device_tree_pasemi()
3140 	 * The io-bridge has device_type set to 'io-bridge' change it to 'isa'  in fixup_device_tree_pasemi()
3141 	 * so that generic isa-bridge code can add the SB600 and its on-board  in fixup_device_tree_pasemi()
3144 	name = "/pxp@0,e0000000/io-bridge@0";  in fixup_device_tree_pasemi()
3180 	cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu);  in prom_find_boot_cpu()
3201 		prom_setprop(prom.chosen, "/chosen", "linux,initrd-start",  in prom_check_initrd()
3204 		prom_setprop(prom.chosen, "/chosen", "linux,initrd-end",  in prom_check_initrd()
3208 			    prom_initrd_end - prom_initrd_start);  in prom_check_initrd()
3231 	/* Get the start of the TOC by using r2 directly. */  in __reloc_toc()
3232 	asm volatile("addi %0,2,-0x8000" : "=b" (toc_entry));  in __reloc_toc()
3244 		(__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);  in reloc_toc()
3255 		(__prom_init_toc_end - __prom_init_toc_start) / sizeof(long);  in unreloc_toc()
3259 	__reloc_toc(-offset, nr_entries);  in unreloc_toc()
3294 	 * relocated it so the check will fail. Restore the original image by  in setup_secure_guest()
3339 	memset(&__bss_start, 0, __bss_stop - __bss_start);  in prom_init()
3424 	 * On non-powermacs, try to instantiate RTAS. PowerMacs don't  in prom_init()
3425 	 * have a usable RTAS implementation.  in prom_init()
3436 	 * On non-powermacs, put all CPUs in spin-loops.  in prom_init()
3440 	 * (This must be done after instanciating RTAS)  in prom_init()
3446 	 * Fill in some infos for use by the kernel later on  in prom_init()
3450 		prom_setprop(prom.chosen, "/chosen", "linux,memory-limit",  in prom_init()
3455 		prom_setprop(prom.chosen, "/chosen", "linux,iommu-off",  in prom_init()
3459 		prom_setprop(prom.chosen, "/chosen", "linux,iommu-force-on",  in prom_init()
3463 		prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-start",  in prom_init()
3466 		prom_setprop(prom.chosen, "/chosen", "linux,tce-alloc-end",  in prom_init()
3473 	 * Fixup any known bugs in the device-tree  in prom_init()
3478 	 * Now finally create the flattened device-tree  in prom_init()
3506 	prom_debug("->dt_header_start=0x%lx\n", hdr);  in prom_init()
3509 	reloc_got2(-offset);  in prom_init()