| 1 | /*␊ |
| 2 | * Copyright 2009 netkas␊ |
| 3 | */␊ |
| 4 | ␊ |
| 5 | //#include "libsaio.h"␊ |
| 6 | //#include "bootstruct.h"␊ |
| 7 | #include "boot.h"␊ |
| 8 | ␊ |
| 9 | #ifndef DEBUG_PCIROOT␊ |
| 10 | #define DEBUG_PCIROOT 1␊ |
| 11 | #endif␊ |
| 12 | ␊ |
| 13 | #if DEBUG_PCIROOT␊ |
| 14 | #define DBG(x...) printf(x)␊ |
| 15 | #else␊ |
| 16 | #define DBG(x...)␊ |
| 17 | #endif␊ |
| 18 | ␊ |
| 19 | static int rootuid = 10; //value means function wasnt ran yet␊ |
| 20 | ␊ |
| 21 | static unsigned int findrootuid(unsigned char * dsdt, int len)␊ |
| 22 | {␊ |
| 23 | ␉int i;␊ |
| 24 | ␉for (i=0; i<64 && i<len-5; i++) //not far than 64 symbols from pci root ␊ |
| 25 | ␉{␊ |
| 26 | ␉␉if(dsdt[i] == '_' && dsdt[i+1] == 'U' && dsdt[i+2] == 'I' && dsdt[i+3] == 'D' && dsdt[i+5] == 0x08)␊ |
| 27 | ␉␉{␊ |
| 28 | ␉␉␉return dsdt[i+4];␊ |
| 29 | ␉␉}␊ |
| 30 | ␉}␊ |
| 31 | ␉return 11;␊ |
| 32 | }␊ |
| 33 | ␊ |
| 34 | static unsigned int findpciroot(unsigned char * dsdt,int len)␊ |
| 35 | {␊ |
| 36 | ␉int i;␊ |
| 37 | ␊ |
| 38 | ␉for (i=0; i<len-4; i++) {␊ |
| 39 | ␉␉if(dsdt[i] == 'P' && dsdt[i+1] == 'C' && dsdt[i+2] == 'I' && (dsdt[i+3] == 0x08 || dsdt [i+4] == 0x08)) {␊ |
| 40 | ␉␉␉return findrootuid(dsdt+i, len-i);␊ |
| 41 | ␉␉}␊ |
| 42 | ␉}␊ |
| 43 | ␉return 10;␊ |
| 44 | }␊ |
| 45 | ␊ |
| 46 | int getPciRootUID(void)␊ |
| 47 | {␊ |
| 48 | ␉void *new_dsdt;␊ |
| 49 | ␉const char *val;␊ |
| 50 | ␉int len, fsize;␊ |
| 51 | ␉const char * dsdt_filename = NULL;␊ |
| 52 | ␉extern int search_and_get_acpi_fd(const char *, const char **);␊ |
| 53 | ␊ |
| 54 | ␉if (rootuid < 10)␊ |
| 55 | ␉␉return rootuid;␊ |
| 56 | ␉␊ |
| 57 | ␉rootuid = 0;␉/* default uid = 0 */␊ |
| 58 | ␊ |
| 59 | ␉if (getValueForKey(kPCIRootUIDKey, &val, &len, &bootInfo->bootConfig)) {␊ |
| 60 | ␉␉if (isdigit(val[0])) rootuid = val[0] - '0';␊ |
| 61 | ␉␉goto out;␊ |
| 62 | ␉}␊ |
| 63 | ␉␊ |
| 64 | ␉verbose("(%s) ", __FUNCTION__);␊ |
| 65 | ␉int fd = search_and_get_acpi_fd("DSDT.aml", &dsdt_filename);␊ |
| 66 | ␊ |
| 67 | ␉// Check booting partition␊ |
| 68 | ␉if (fd < 0)␊ |
| 69 | ␉{␉ ␊ |
| 70 | ␉ verbose("No DSDT found, using 0 as uid value.\n");␊ |
| 71 | ␉ rootuid = 0;␊ |
| 72 | ␉ goto out;␊ |
| 73 | ␉}␊ |
| 74 | ␉␊ |
| 75 | ␉fsize = file_size(fd);␊ |
| 76 | ␊ |
| 77 | ␉if ((new_dsdt = malloc(fsize)) == NULL) {␊ |
| 78 | ␉␉verbose("[ERROR] alloc DSDT memory failed\n");␊ |
| 79 | ␉␉close (fd);␊ |
| 80 | ␉␉goto out;␊ |
| 81 | ␉}␊ |
| 82 | ␉␊ |
| 83 | ␉if (read (fd, new_dsdt, fsize) != fsize) {␊ |
| 84 | ␉␉verbose("[ERROR] read %s failed\n", dsdt_filename);␊ |
| 85 | ␉␉close (fd);␊ |
| 86 | ␉␉goto out;␊ |
| 87 | ␉}␊ |
| 88 | ␉close (fd);␊ |
| 89 | ␊ |
| 90 | ␉rootuid = findpciroot(new_dsdt, fsize);␊ |
| 91 | ␉free(new_dsdt);␊ |
| 92 | ␊ |
| 93 | ␉// make sure it really works: ␊ |
| 94 | ␉if (rootuid == 11)␊ |
| 95 | ␉␉rootuid = 0; //usually when _UID isnt present, it means uid is zero␊ |
| 96 | ␉else if (rootuid < 0 || rootuid > 9) ␊ |
| 97 | ␉{␊ |
| 98 | ␉␉verbose("PciRoot uid value wasnt found, using 0, if you want it to be 1, use -PciRootUID flag");␊ |
| 99 | ␉␉rootuid = 0;␊ |
| 100 | ␉}␊ |
| 101 | out:␊ |
| 102 | ␉verbose("Using PCI-Root-UID value: %d\n", rootuid);␊ |
| 103 | ␉return rootuid;␊ |
| 104 | }␊ |
| 105 | |
