// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright (C) Paul Mackerras 1997. */#include <stddef.h>#include "types.h"#include "elf.h"#include "string.h"#include "stdio.h"#include "page.h"#include "ops.h" #include "of.h" typedef u32 prom_arg_t; /* The following structure is used to communicate with open firmware. * All arguments in and out are in big endian format. */struct prom_args {	__be32 service;	/* Address of service name string. */	__be32 nargs;	/* Number of input arguments. */	__be32 nret;	/* Number of output arguments. */	__be32 args[10];	/* Input/output arguments. */}; #ifdef __powerpc64__extern int prom(void *);#elsestatic int (*prom) (void *);#endif void of_init(void *promptr){#ifndef __powerpc64__	prom = (int (*)(void *))promptr;#endif} #define ADDR(x)		(u32)(unsigned long)(x) int of_call_prom(const char *service, int nargs, int nret, ...){	int i;	struct prom_args args;	va_list list; 	args.service = cpu_to_be32(ADDR(service));	args.nargs = cpu_to_be32(nargs);	args.nret = cpu_to_be32(nret); 	va_start(list, nret);	for (i = 0; i < nargs; i++)		args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));	va_end(list); 	for (i = 0; i < nret; i++)		args.args[nargs+i] = 0; 	if (prom(&args) < 0)		return PROM_ERROR; 	return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;} static int of_call_prom_ret(const char *service, int nargs, int nret,			    prom_arg_t *rets, ...){	int i;	struct prom_args args;	va_list list; 	args.service = cpu_to_be32(ADDR(service));	args.nargs = cpu_to_be32(nargs);	args.nret = cpu_to_be32(nret); 	va_start(list, rets);	for (i = 0; i < nargs; i++)		args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));	va_end(list); 	for (i = 0; i < nret; i++)		args.args[nargs+i] = 0; 	if (prom(&args) < 0)		return PROM_ERROR; 	if (rets != NULL)		for (i = 1; i < nret; ++i)			rets[i-1] = be32_to_cpu(args.args[nargs+i]); 	return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;} /* returns true if s2 is a prefix of s1 */static int string_match(const char *s1, const char *s2){	for (; *s2; ++s2)		if (*s1++ != *s2)			return 0;	return 1;} /* * Older OF's require that when claiming a specific range of addresses, * we claim the physical space in the /memory node and the virtual * space in the chosen mmu node, and then do a map operation to * map virtual to physical. */static int need_map = -1;static ihandle chosen_mmu;static ihandle memory; static int check_of_version(void){	phandle oprom, chosen;	char version[64]; 	oprom = of_finddevice("/openprom");	if (oprom == (phandle) -1)		return 0;	if (of_getprop(oprom, "model", version, sizeof(version)) <= 0)		return 0;	version[sizeof(version)-1] = 0;	printf("OF version = '%s'\r\n", version);	if (!string_match(version, "Open Firmware, 1.")	    && !string_match(version, "FirmWorks,3."))		return 0;	chosen = of_finddevice("/chosen");	if (chosen == (phandle) -1) {		chosen = of_finddevice("/chosen@0");		if (chosen == (phandle) -1) {			printf("no chosen\n");			return 0;		}	}	if (of_getprop(chosen, "mmu", &chosen_mmu, sizeof(chosen_mmu)) <= 0) {		printf("no mmu\n");		return 0;	}	memory = of_call_prom("open", 1, 1, "/memory");	if (memory == PROM_ERROR) {		memory = of_call_prom("open", 1, 1, "/memory@0");		if (memory == PROM_ERROR) {			printf("no memory node\n");			return 0;		}	}	printf("old OF detected\r\n");	return 1;} unsigned int of_claim(unsigned long virt, unsigned long size,		      unsigned long align){	int ret;	prom_arg_t result; 	if (need_map < 0)		need_map = check_of_version();	if (align || !need_map)		return of_call_prom("claim", 3, 1, virt, size, align); 	ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", memory,			       align, size, virt);	if (ret != 0 || result == -1)		return  -1;	ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", chosen_mmu,			       align, size, virt);	/* 0x12 == coherent + read/write */	ret = of_call_prom("call-method", 6, 1, "map", chosen_mmu,			   0x12, size, virt, virt);	return virt;} void *of_vmlinux_alloc(unsigned long size){	unsigned long start = (unsigned long)_start, end = (unsigned long)_end;	unsigned long addr;	void *p; 	/* With some older POWER4 firmware we need to claim the area the kernel	 * will reside in.  Newer firmwares don't need this so we just ignore	 * the return value.	 */	addr = (unsigned long) of_claim(start, end - start, 0);	printf("Trying to claim from 0x%lx to 0x%lx (0x%lx) got %lx\r\n",	       start, end, end - start, addr); 	p = malloc(size);	if (!p)		fatal("Can't allocate memory for kernel image!\n\r"); 	return p;} void of_exit(void){	of_call_prom("exit", 0, 0);} /* * OF device tree routines */void *of_finddevice(const char *name){	return (void *) (unsigned long) of_call_prom("finddevice", 1, 1, name);} int of_getprop(const void *phandle, const char *name, void *buf,	       const int buflen){	return of_call_prom("getprop", 4, 1, phandle, name, buf, buflen);} int of_setprop(const void *phandle, const char *name, const void *buf,	       const int buflen){	return of_call_prom("setprop", 4, 1, phandle, name, buf, buflen);}