| /* |
| * Copyright (C) Paul Mackerras 1997. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| #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. */ |
| }; |
| |
| static int (*prom) (void *); |
| |
| void of_init(void *promptr) |
| { |
| prom = (int (*)(void *))promptr; |
| } |
| |
| #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 = ADDR(service); |
| args.nargs = nargs; |
| args.nret = nret; |
| |
| va_start(list, nret); |
| for (i = 0; i < nargs; i++) |
| args.args[i] = 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 -1; |
| |
| return (nret > 0)? 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 = ADDR(service); |
| args.nargs = nargs; |
| args.nret = nret; |
| |
| va_start(list, rets); |
| for (i = 0; i < nargs; i++) |
| args.args[i] = 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 -1; |
| |
| if (rets != (void *) 0) |
| for (i = 1; i < nret; ++i) |
| rets[i-1] = args.args[nargs+i]; |
| |
| return (nret > 0)? 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 phandle 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 = (ihandle) of_call_prom("open", 1, 1, "/memory"); |
| if (memory == (ihandle) -1) { |
| memory = (ihandle) of_call_prom("open", 1, 1, "/memory@0"); |
| if (memory == (ihandle) -1) { |
| printf("no memory node\n"); |
| return 0; |
| } |
| } |
| printf("old OF detected\r\n"); |
| return 1; |
| } |
| |
| void *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 (void *) 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 (void *) -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 (void *) virt; |
| } |
| |
| void *of_vmlinux_alloc(unsigned long size) |
| { |
| unsigned long start = (unsigned long)_start, end = (unsigned long)_end; |
| void *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 = of_claim(start, end - start, 0); |
| printf("Trying to claim from 0x%lx to 0x%lx (0x%lx) got %p\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 (phandle) 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); |
| } |