FreeCalypso > hg > freecalypso-tools

annotate target-utils/libtiffs/init.c @ 582:deda54106c0e

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doc/Target-boot-control: first draft
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 03 Feb 2020 01:25:31 +0000
parents c10a65f7563e
children
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1 #include "types.h"
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2 #include "struct.h"
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3 #include "globals.h"
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4 #include "macros.h"
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5
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6 static const u8 ffs_sector_signature[6] = {'F', 'f', 's', '#', 0x10, 0x02};
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7
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8 static
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9 find_indexblk()
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10 {
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11 u32 sector_addr;
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12 u8 *sector_ptr;
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13 int i;
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14
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15 printf("Looking for TIFFS active index block\n");
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16 sector_addr = tiffs_base_addr;
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17 for (i = 0; i < tiffs_nsectors; i++) {
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18 sector_ptr = (u8 *) sector_addr;
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19 if (!bcmp(sector_ptr, ffs_sector_signature, 6) &&
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20 sector_ptr[8] == 0xAB) {
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21 printf("Found at %08X\n", sector_addr);
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22 tiffs_active_index = (struct inode *) sector_ptr;
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23 return(0);
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24 }
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25 sector_addr += tiffs_sector_size;
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26 }
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27 printf("Error: Not found in any of the %d candidate sectors\n",
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28 tiffs_nsectors);
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29 return(-1);
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30 }
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32 static
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33 find_rootino()
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34 {
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35 int ino;
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36 struct inode *irec;
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37
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38 printf("Looking for the root inode\n");
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39 for (ino = 1; ; ino++) {
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40 if (ino >= tiffs_sector_size >> 4) {
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41 printf("Error: Hit end of sector, no root inode found\n");
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42 return(-1);
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43 }
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44 irec = tiffs_active_index + ino;
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45 if (irec->type == OBJTYPE_DIR && *inode_to_dataptr(irec) == '/')
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46 break;
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47 }
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48 printf("Found at inode #%x\n", ino);
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49 tiffs_root_ino = ino;
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50 return(0);
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51 }
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53 tiffs_init()
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54 {
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55 int stat;
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57 if (tiffs_init_done)
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58 return(0);
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59 stat = find_indexblk();
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60 if (stat < 0)
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61 return(stat);
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62 stat = find_rootino();
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63 if (stat < 0)
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64 return(stat);
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65 tiffs_init_done = 1;
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66 return(0);
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67 }