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1/*␊
2 * Copyright 2009 netkas␊
3 */␊
4␊
5#include "libsaio.h"␊
6#include "boot.h"␊
7#include "bootstruct.h"␊
8␊
9#ifndef DEBUG_PCIROOT␊
10#define DEBUG_PCIROOT 0␊
11#endif␊
12␊
13#if DEBUG_PCIROOT␊
14#define DBG(x...) printf(x)␊
15#else␊
16#define DBG(x...) msglog(x)␊
17#endif␊
18␊
19static int rootuid = 10; //value means function wasn't ran yet␊
20␊
21static 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␊
34static 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␊
46int getPciRootUID(void)␊
47{␊
48␉char dsdt_dirSpec[256];␊
49␉const char *val = NULL;␊
50␉int len = 0;␊
51␉const char *dsdt_filename = NULL;␊
52␉//extern int search_and_get_acpi_fd(const char *, const char **);␊
53␉//extern void *loadACPITable (const char *filename);␊
54␊
55␉if (rootuid < 10)␊
56␉{␊
57␉␉return rootuid;␊
58␉}␊
59␊
60␉rootuid = 0;␉/* default _UID = 0 */␊
61␊
62␉if (getValueForKey(kPCIRootUID, &val, &len, &bootInfo->chameleonConfig) && len)␊
63␉{␊
64␉␉if (isdigit(val[0]))␊
65␉␉{␊
66␉␉␉rootuid = val[0] - '0';␊
67␉␉}␊
68␊
69␉␉goto out;␊
70␉}␊
71␉/* Chameleon compatibility */␊
72␉else if (getValueForKey("PciRoot", &val, &len, &bootInfo->chameleonConfig) && len)␊
73␉{␊
74␉␉if (isdigit(val[0]))␊
75␉␉{␊
76␉␉␉rootuid = val[0] - '0';␊
77␉␉}␊
78␊
79␉␉goto out;␊
80␉}␊
81␉/* PCEFI compatibility */␊
82␉else if (getValueForKey("-pci0", &val, &len, &bootInfo->chameleonConfig) && len)␊
83␉{␊
84␉␉rootuid = 0;␊
85␉␉goto out;␊
86␉}␊
87␉else if (getValueForKey("-pci1", &val, &len, &bootInfo->chameleonConfig) && len)␊
88␉{␊
89␉␉rootuid = 1;␊
90␉␉goto out;␊
91␉}␊
92␊
93␉if (new_dsdt != NULL)␊
94␉{␊
95␉␉len = *(int *)(new_dsdt + 4);␊
96␉␉verbose("PCIrootUID: custom DSDT already loaded @%08X, length=%d.\n", new_dsdt, len);␊
97␉}␊
98␉else␊
99␉{␊
100␉␉// Try using the file specified with the DSDT option␊
101␉␉if (getValueForKey(kDSDT, &dsdt_filename, &len, &bootInfo->chameleonConfig) && len)␊
102␉␉{␊
103␉␉␉snprintf(dsdt_dirSpec, sizeof(dsdt_dirSpec), dsdt_filename);␊
104␉␉}␊
105␉␉else␊
106␉␉{␊
107␉␉␉sprintf(dsdt_dirSpec, "DSDT.aml");␊
108␉␉}␊
109␊
110␉␉verbose("PCIrootUID: attempting to load custom DSDT...\n");␊
111␉␉if ((new_dsdt = loadACPITable(dsdt_dirSpec)))␊
112␉␉{␊
113␉␉␉len = *(int *)(new_dsdt + 4);␊
114␉␉␉verbose("PCIrootUID: custom DSDT loaded @%08X, length=%d\n", new_dsdt, len);␊
115␉␉}␊
116␉␉else␊
117␉␉{␊
118␉␉␉//verbose("PCIrootUID: custom DSDT not found!.\n");␊
119␉␉}␊
120␉}␊
121/*␊
122␉// Try using the file specified with the DSDT option␊
123␉if (getValueForKey(kDSDT, &dsdt_filename, &len, &bootInfo->chameleonConfig) && len)␊
124␉{␊
125␉␉snprintf(dsdt_dirSpec, sizeof(dsdt_dirSpec), dsdt_filename);␊
126␉}␊
127␉else␊
128␉{␊
129␉␉sprintf(dsdt_dirSpec, "DSDT.aml");␊
130␉}␊
131␊
132␉DBG("PCIrootUID: trying file DSDT.aml... ");␊
133␊
134␉int fd = search_and_get_acpi_fd(dsdt_dirSpec, &dsdt_filename);␊
135␊
136␉// Check booting partition␊
137␉if (fd<0)␊
138␉{␉ ␊
139␉␉DBG("PCIrootUID: file '%s' not found, using default value.\n", dsdt_filename);␊
140␉␉rootuid = 0;␊
141␉␉goto out;␊
142␉}␊
143␊
144␉fsize = file_size(fd);␊
145␊
146␉if (!(new_dsdt = malloc(fsize)))␊
147␉{␊
148␉␉DBG("PCIrootUID: ERROR: allocating DSDT memory failed.\n");␊
149␉␉close (fd);␊
150␉␉goto out;␊
151␉}␊
152␊
153␉if (read (fd, new_dsdt, fsize) != fsize)␊
154␉{␊
155␉␉DBG("PCIrootUID: ERROR: failed reading DSDT from '%s'.\n", dsdt_filename);␊
156␉␉free(new_dsdt);␊
157␉␉close (fd);␊
158␉␉goto out;␊
159␉}␊
160␊
161␉close (fd);␊
162*/␊
163␉if (len)␊
164␉{␊
165␉␉rootuid = findpciroot(new_dsdt, len);␊
166␉}␊
167/*␊
168␉free(new_dsdt);␊
169*/␊
170␉// make sure it really works: ␊
171␉if (rootuid == 11)␊
172␉{␊
173␉␉rootuid = 0; //usually when _UID isn't present, it means uid is zero␊
174␉}␊
175␉else if (rootuid < 0 || rootuid > 9) ␊
176␉{␊
177␉␉verbose("PCIrootUID: proper value wasn't found. Using default value (0).\n");␊
178␉␉rootuid = 0;␊
179␉␉return rootuid;␊
180␉}␊
181␊
182out:␊
183␉verbose("PCIrootUID=0x%02X: using.\n", rootuid);␊
184␉return rootuid;␊
185}␊
186

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