FreeCalypso > hg > freecalypso-tools

annotate target-utils/libtiffs/init.c @ 18:d9307880f59f

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doc/RVTMUX: reference to TI's tmffs.c source updated for the repository split
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 19 Oct 2016 01:51:05 +0000
parents e7502631a0f9
children 87cb03b35f77
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Mychaela Falconia <falcon@freecalypso.org>
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1 #include "types.h"
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Mychaela Falconia <falcon@freecalypso.org>
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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 static const u8 blank_flash_line[16] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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8 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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9 0xFF, 0xFF, 0xFF, 0xFF};
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10
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11 static
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12 find_indexblk()
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13 {
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14 u32 sector_addr;
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15 u8 *sector_ptr;
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16 int i;
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17
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18 printf("Looking for MPFFS active index block\n");
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19 sector_addr = mpffs_base_addr;
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20 for (i = 0; i < mpffs_nsectors; i++) {
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21 sector_ptr = (u8 *) sector_addr;
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22 if (!bcmp(sector_ptr, ffs_sector_signature, 6) &&
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23 sector_ptr[8] == 0xAB) {
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24 printf("Found at %08X\n", sector_addr);
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25 mpffs_active_index = (struct inode *) sector_ptr;
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26 return(0);
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27 }
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28 sector_addr += mpffs_sector_size;
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29 }
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30 printf("Error: Not found in any of the %d candidate sectors\n",
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31 mpffs_nsectors);
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32 return(-1);
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33 }
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34
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35 static
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36 find_rootino()
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37 {
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38 int ino;
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39 struct inode *irec;
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40
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41 printf("Looking for the root inode\n");
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42 for (ino = 1; ; ino++) {
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43 if (ino >= mpffs_sector_size >> 4) {
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44 printf("Error: Hit end of sector, no root inode found\n");
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45 return(-1);
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46 }
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47 irec = mpffs_active_index + ino;
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48 if (!bcmp((u8 *) irec, blank_flash_line, 16)) {
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49 printf("Error: Hit blank flash, no root inode found\n");
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50 return(-1);
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51 }
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52 if (irec->type == OBJTYPE_DIR && *inode_to_dataptr(irec) == '/')
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53 break;
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54 }
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55 printf("Found at inode #%x\n", ino);
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56 mpffs_root_ino = ino;
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57 return(0);
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58 }
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59
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60 mpffs_init()
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61 {
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62 int stat;
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63
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64 if (mpffs_init_done)
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65 return(0);
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66 stat = find_indexblk();
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67 if (stat < 0)
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68 return(stat);
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69 stat = find_rootino();
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70 if (stat < 0)
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71 return(stat);
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72 mpffs_init_done = 1;
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73 return(0);
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74 }