290 lines
6.3 KiB
C
290 lines
6.3 KiB
C
/*
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* Copyright (C) Paul Mackerras 1997.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <stdarg.h>
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#include <stddef.h>
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#include "types.h"
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#include "elf.h"
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#include "string.h"
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#include "stdio.h"
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#include "page.h"
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#include "ops.h"
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typedef void *ihandle;
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typedef void *phandle;
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extern char _end[];
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/* Value picked to match that used by yaboot */
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#define PROG_START 0x01400000 /* only used on 64-bit systems */
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#define RAM_END (512<<20) /* Fixme: use OF */
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#define ONE_MB 0x100000
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int (*prom) (void *);
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static unsigned long claim_base;
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static int call_prom(const char *service, int nargs, int nret, ...)
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{
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int i;
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struct prom_args {
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const char *service;
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int nargs;
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int nret;
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unsigned int args[12];
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} args;
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va_list list;
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args.service = service;
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args.nargs = nargs;
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args.nret = nret;
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va_start(list, nret);
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for (i = 0; i < nargs; i++)
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args.args[i] = va_arg(list, unsigned int);
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va_end(list);
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for (i = 0; i < nret; i++)
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args.args[nargs+i] = 0;
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if (prom(&args) < 0)
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return -1;
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return (nret > 0)? args.args[nargs]: 0;
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}
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static int call_prom_ret(const char *service, int nargs, int nret,
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unsigned int *rets, ...)
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{
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int i;
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struct prom_args {
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const char *service;
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int nargs;
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int nret;
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unsigned int args[12];
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} args;
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va_list list;
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args.service = service;
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args.nargs = nargs;
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args.nret = nret;
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va_start(list, rets);
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for (i = 0; i < nargs; i++)
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args.args[i] = va_arg(list, unsigned int);
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va_end(list);
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for (i = 0; i < nret; i++)
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args.args[nargs+i] = 0;
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if (prom(&args) < 0)
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return -1;
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if (rets != (void *) 0)
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for (i = 1; i < nret; ++i)
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rets[i-1] = args.args[nargs+i];
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return (nret > 0)? args.args[nargs]: 0;
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}
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/*
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* Older OF's require that when claiming a specific range of addresses,
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* we claim the physical space in the /memory node and the virtual
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* space in the chosen mmu node, and then do a map operation to
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* map virtual to physical.
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*/
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static int need_map = -1;
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static ihandle chosen_mmu;
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static phandle memory;
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/* returns true if s2 is a prefix of s1 */
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static int string_match(const char *s1, const char *s2)
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{
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for (; *s2; ++s2)
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if (*s1++ != *s2)
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return 0;
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return 1;
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}
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static int check_of_version(void)
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{
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phandle oprom, chosen;
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char version[64];
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oprom = finddevice("/openprom");
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if (oprom == (phandle) -1)
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return 0;
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if (getprop(oprom, "model", version, sizeof(version)) <= 0)
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return 0;
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version[sizeof(version)-1] = 0;
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printf("OF version = '%s'\r\n", version);
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if (!string_match(version, "Open Firmware, 1.")
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&& !string_match(version, "FirmWorks,3."))
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return 0;
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chosen = finddevice("/chosen");
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if (chosen == (phandle) -1) {
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chosen = finddevice("/chosen@0");
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if (chosen == (phandle) -1) {
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printf("no chosen\n");
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return 0;
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}
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}
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if (getprop(chosen, "mmu", &chosen_mmu, sizeof(chosen_mmu)) <= 0) {
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printf("no mmu\n");
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return 0;
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}
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memory = (ihandle) call_prom("open", 1, 1, "/memory");
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if (memory == (ihandle) -1) {
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memory = (ihandle) call_prom("open", 1, 1, "/memory@0");
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if (memory == (ihandle) -1) {
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printf("no memory node\n");
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return 0;
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}
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}
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printf("old OF detected\r\n");
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return 1;
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}
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static void *claim(unsigned long virt, unsigned long size, unsigned long align)
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{
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int ret;
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unsigned int result;
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if (need_map < 0)
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need_map = check_of_version();
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if (align || !need_map)
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return (void *) call_prom("claim", 3, 1, virt, size, align);
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ret = call_prom_ret("call-method", 5, 2, &result, "claim", memory,
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align, size, virt);
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if (ret != 0 || result == -1)
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return (void *) -1;
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ret = call_prom_ret("call-method", 5, 2, &result, "claim", chosen_mmu,
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align, size, virt);
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/* 0x12 == coherent + read/write */
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ret = call_prom("call-method", 6, 1, "map", chosen_mmu,
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0x12, size, virt, virt);
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return (void *) virt;
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}
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static void *of_try_claim(unsigned long size)
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{
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unsigned long addr = 0;
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if (claim_base == 0)
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claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
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for(; claim_base < RAM_END; claim_base += ONE_MB) {
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#ifdef DEBUG
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printf(" trying: 0x%08lx\n\r", claim_base);
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#endif
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addr = (unsigned long)claim(claim_base, size, 0);
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if ((void *)addr != (void *)-1)
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break;
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}
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if (addr == 0)
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return NULL;
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claim_base = PAGE_ALIGN(claim_base + size);
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return (void *)addr;
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}
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static void of_image_hdr(const void *hdr)
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{
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const Elf64_Ehdr *elf64 = hdr;
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if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
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/*
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* Maintain a "magic" minimum address. This keeps some older
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* firmware platforms running.
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*/
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if (claim_base < PROG_START)
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claim_base = PROG_START;
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}
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}
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static void *of_vmlinux_alloc(unsigned long size)
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{
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void *p = malloc(size);
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if (!p)
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fatal("Can't allocate memory for kernel image!\n\r");
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return p;
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}
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static void of_exit(void)
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{
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call_prom("exit", 0, 0);
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}
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/*
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* OF device tree routines
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*/
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static void *of_finddevice(const char *name)
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{
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return (phandle) call_prom("finddevice", 1, 1, name);
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}
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static int of_getprop(const void *phandle, const char *name, void *buf,
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const int buflen)
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{
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return call_prom("getprop", 4, 1, phandle, name, buf, buflen);
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}
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static int of_setprop(const void *phandle, const char *name, const void *buf,
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const int buflen)
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{
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return call_prom("setprop", 4, 1, phandle, name, buf, buflen);
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}
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/*
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* OF console routines
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*/
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static void *of_stdout_handle;
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static int of_console_open(void)
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{
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void *devp;
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if (((devp = finddevice("/chosen")) != NULL)
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&& (getprop(devp, "stdout", &of_stdout_handle,
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sizeof(of_stdout_handle))
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== sizeof(of_stdout_handle)))
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return 0;
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return -1;
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}
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static void of_console_write(char *buf, int len)
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{
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call_prom("write", 3, 1, of_stdout_handle, buf, len);
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}
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void platform_init(unsigned long a1, unsigned long a2, void *promptr)
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{
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platform_ops.image_hdr = of_image_hdr;
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platform_ops.malloc = of_try_claim;
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platform_ops.exit = of_exit;
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platform_ops.vmlinux_alloc = of_vmlinux_alloc;
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dt_ops.finddevice = of_finddevice;
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dt_ops.getprop = of_getprop;
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dt_ops.setprop = of_setprop;
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console_ops.open = of_console_open;
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console_ops.write = of_console_write;
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prom = (int (*)(void *))promptr;
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loader_info.promptr = promptr;
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if (a1 && a2 && a2 != 0xdeadbeef) {
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loader_info.initrd_addr = a1;
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loader_info.initrd_size = a2;
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}
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}
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