1 | /* |
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2 | * bat.c |
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3 | * |
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4 | * This file contains the implementation of C function to |
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5 | * Instanciate 60x/7xx ppc Block Address Translation (BAT) registers. |
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6 | * More detailled information can be found on motorola |
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7 | * site and more precisely in the following book : |
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8 | * |
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9 | * MPC750 |
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10 | * Risc Microporcessor User's Manual |
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11 | * Mtorola REF : MPC750UM/AD 8/97 |
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12 | * |
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13 | * Copyright (C) 1999 Eric Valette (valette@crf.canon.fr) |
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14 | * Canon Centre Recherche France. |
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15 | * |
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16 | * The license and distribution terms for this file may be |
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17 | * found in found in the file LICENSE in this distribution or at |
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18 | * http://www.OARcorp.com/rtems/license.html. |
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19 | * |
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20 | * $Id$ |
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21 | */ |
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22 | |
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23 | #include <libcpu/bat.h> |
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24 | |
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25 | typedef union { /* BAT register values to be loaded */ |
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26 | BAT bat; |
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27 | unsigned int word[2]; |
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28 | }ubat; |
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29 | |
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30 | typedef struct batrange { /* stores address ranges mapped by BATs */ |
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31 | unsigned long start; |
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32 | unsigned long limit; |
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33 | unsigned long phys; |
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34 | }batrange; |
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35 | |
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36 | batrange bat_addrs[4]; |
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37 | |
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38 | void asm_setdbat0(unsigned int, unsigned int); |
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39 | void setdbat(int bat_index, unsigned long virt, unsigned long phys, |
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40 | unsigned int size, int flags) |
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41 | { |
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42 | unsigned int bl; |
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43 | int wimgxpp; |
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44 | ubat bat; |
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45 | |
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46 | bl = (size >= (1<<17)) ? (size >> 17) - 1 : 0; |
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47 | /* 603, 604, etc. */ |
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48 | wimgxpp = flags & (_PAGE_WRITETHRU | _PAGE_NO_CACHE |
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49 | | _PAGE_COHERENT | _PAGE_GUARDED); |
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50 | wimgxpp |= (flags & _PAGE_RW)? BPP_RW: BPP_RX; |
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51 | bat.word[0] = virt | (bl << 2) | 2; /* Vs=1, Vp=0 */ |
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52 | bat.word[1] = phys | wimgxpp; |
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53 | if (flags & _PAGE_USER) |
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54 | bat.bat.batu.vp = 1; |
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55 | bat_addrs[bat_index].start = virt; |
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56 | bat_addrs[bat_index].limit = virt + (bl ? ((bl + 1) << 17) - 1 : 0); |
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57 | bat_addrs[bat_index].phys = phys; |
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58 | if ( 0 == bl ) { |
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59 | /* size of 0 tells us to switch it off */ |
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60 | bat.bat.batu.vp = 0; |
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61 | bat.bat.batu.vs = 0; |
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62 | } |
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63 | switch (bat_index) { |
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64 | case 0 : asm_setdbat0(bat.word[0], bat.word[1]); break; |
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65 | case 1 : asm_setdbat1(bat.word[0], bat.word[1]); break; |
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66 | case 2 : asm_setdbat2(bat.word[0], bat.word[1]); break; |
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67 | case 3 : asm_setdbat3(bat.word[0], bat.word[1]); break; |
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68 | default: printk("bat.c : invalid BAT bat_index\n"); |
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69 | } |
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70 | } |
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71 | |
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