93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/*
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* Copyright (C) Paul Mackerras 1997.
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* Copyright (C) Leigh Brown 2002.
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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 "of1275.h"
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#include "nonstdio.h"
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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 == OF_INVALID_HANDLE)
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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'\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 == OF_INVALID_HANDLE) {
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chosen = finddevice("/chosen@0");
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if (chosen == OF_INVALID_HANDLE) {
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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 == OF_INVALID_HANDLE) {
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memory = (ihandle) call_prom("open", 1, 1, "/memory@0");
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if (memory == OF_INVALID_HANDLE) {
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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\n");
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return 1;
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}
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void *claim(unsigned int virt, unsigned int size, unsigned int 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 virt;
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}
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