coreboot-v2: drop this ugly historic union name in v2 that was dropped in v3
[coreboot.git] / src / cpu / amd / dualcore / amd_sibling.c
1 /* 2004.12 yhlu add dual core support */
2
3 #include <console/console.h>
4 #include <cpu/cpu.h>
5 #include <cpu/x86/lapic.h>
6 #include <cpu/amd/dualcore.h>
7 #include <device/device.h>
8 #include <device/pci.h>
9 #include <pc80/mc146818rtc.h>
10 #include <smp/spinlock.h>
11 #include <cpu/x86/mtrr.h>
12 #include <cpu/amd/model_fxx_msr.h>
13 #include <cpu/amd/model_fxx_rev.h>
14 #include <cpu/amd/amdk8_sysconf.h>
15
16 static int first_time = 1;
17 static int disable_siblings = !CONFIG_LOGICAL_CPUS;
18
19 #include "dualcore_id.c"
20
21 static int get_max_siblings(int nodes)
22 {
23         device_t dev;
24         int nodeid;
25         int siblings=0;
26
27         //get max siblings from all the nodes
28         for(nodeid=0; nodeid<nodes; nodeid++){
29                 int j;
30                 dev = dev_find_slot(0, PCI_DEVFN(0x18+nodeid, 3));
31                 j = (pci_read_config32(dev, 0xe8) >> 12) & 3; 
32                 if(siblings < j) {
33                         siblings = j;
34                 }
35         }
36         
37         return siblings;
38 }
39
40 static void enable_apic_ext_id(int nodes)
41 {
42         device_t dev;
43         int nodeid;
44
45         //enable APIC_EXIT_ID all the nodes
46         for(nodeid=0; nodeid<nodes; nodeid++){
47                 uint32_t val;
48                 dev = dev_find_slot(0, PCI_DEVFN(0x18+nodeid, 0));
49                 val = pci_read_config32(dev, 0x68);
50                 val |= (1<<17)|(1<<18);
51                 pci_write_config32(dev, 0x68, val); 
52         }
53 }
54
55
56 unsigned get_apicid_base(unsigned ioapic_num)
57 {
58         device_t dev;
59         int nodes;
60         unsigned apicid_base;
61         int siblings;
62         unsigned nb_cfg_54;
63         int bsp_apic_id = lapicid(); // bsp apicid
64
65         int disable_siblings = !CONFIG_LOGICAL_CPUS;
66
67
68         get_option(&disable_siblings, "dual_core");
69
70         //get the nodes number
71         dev = dev_find_slot(0, PCI_DEVFN(0x18,0));
72         nodes = ((pci_read_config32(dev, 0x60)>>4) & 7) + 1;
73
74         siblings = get_max_siblings(nodes);
75
76         if(bsp_apic_id > 0) { // io apic could start from 0
77                 return 0;  
78         } else if(pci_read_config32(dev, 0x68) & ( (1<<17) | (1<<18)) )  { // enabled ext id but bsp = 0
79                 return 1; 
80         }
81
82         nb_cfg_54 = read_nb_cfg_54();
83
84 #if 0
85         //it is for all e0 single core and nc_cfg_54 low is set, but in the auto.c stage we do not set that bit for it.
86         if(nb_cfg_54 && (!disable_siblings) && (siblings == 0)) {
87                 //we need to check if e0 single core is there
88                 int i;
89                 for(i=0; i<nodes; i++) {
90                         if(is_e0_later_in_bsp(i)) {
91                                 siblings = 1;
92                                 break;
93                         }
94                 }
95         }
96 #endif
97
98         //contruct apicid_base
99
100         if((!disable_siblings) && (siblings>0) ) {
101                 /* for 8 way dual core, we will used up apicid 16:16, actualy 16 is not allowed by current kernel
102                 and the kernel will try to get one that is small than 16 to make io apic work.
103                 I don't know when the kernel can support 256 apic id. (APIC_EXT_ID is enabled) */
104
105                 //4:10 for two way  8:12 for four way 16:16 for eight way
106                 //Use CONFIG_MAX_PHYSICAL_CPUS instead of nodes for better consistency?
107                 apicid_base = nb_cfg_54 ? (siblings+1) * nodes :  8 * siblings + nodes; 
108
109         }
110         else {
111                 apicid_base = nodes;
112         }
113
114         if((apicid_base+ioapic_num-1)>0xf) {
115                 // We need to enable APIC EXT ID
116                 printk_info("if the IO APIC device doesn't support 256 apic id, \r\n you need to set ENABLE_APIC_EXT_ID in auto.c so you can spare 16 id for ioapic\r\n");
117                 enable_apic_ext_id(nodes);
118         }
119         
120         return apicid_base;
121 }
122 #if 0
123 void amd_sibling_init(device_t cpu)
124 {
125         unsigned i, siblings;
126         struct cpuid_result result;
127         unsigned nb_cfg_54;
128         struct node_core_id id;
129
130         /* On the bootstrap processor see if I want sibling cpus enabled */
131         if (first_time) {
132                 first_time = 0;
133                 get_option(&disable_siblings, "dual_core");
134         }
135         result = cpuid(0x80000008);
136         /* See how many sibling cpus we have */
137         /* Is dualcore supported */
138         siblings = (result.ecx & 0xff);
139         if ( siblings < 1) {
140                 return;
141         }
142
143 #if 1
144         printk_debug("CPU: %u %d siblings\n",
145                 cpu->path.apic.apic_id,
146                 siblings);
147 #endif
148
149         nb_cfg_54 = read_nb_cfg_54(); 
150 #if 1
151         id = get_node_core_id(nb_cfg_54); // pre e0 nb_cfg_54 can not be set
152
153         /* See if I am a sibling cpu */
154         //if ((cpu->path.apic.apic_id>>(nb_cfg_54?0:3)) & siblings ) { // siblings = 1, 3, 7, 15,....
155         //if ( ( (cpu->path.apic.apic_id>>(nb_cfg_54?0:3)) % (siblings+1) ) != 0 ) {
156         if(id.coreid != 0) {
157                 if (disable_siblings) {
158                         cpu->enabled = 0;
159                 }
160                 return;
161         }
162 #endif
163                 
164         /* I am the primary cpu start up my siblings */
165
166         for(i = 1; i <= siblings; i++) {
167                 struct device_path cpu_path;
168                 device_t new;
169                 /* Build the cpu device path */
170                 cpu_path.type = DEVICE_PATH_APIC;
171                 cpu_path.apic.apic_id = cpu->path.apic.apic_id + i * (nb_cfg_54?1:8);
172                 if(id.nodeid == 0) {
173                         // need some special processing, because may the bsp is not lifted, but the core1 is lifted
174                         //defined in northbridge.c
175                         if(sysconf.enabled_apic_ext_id && (!sysconf.lift_bsp_apicid)) {
176                                 cpu->path.apic.apic_id += sysconf.apicid_offset;
177                         }
178
179                 }
180
181
182                 /* See if I can find the cpu */
183                 new = find_dev_path(cpu->bus, &cpu_path);
184                 /* Allocate the new cpu device structure */
185                 if(!new) {
186                         new = alloc_dev(cpu->bus, &cpu_path);
187                         new->enabled = 1;
188                         new->initialized = 0;
189                 }
190
191                 new->path.apic.node_id = cpu->path.apic.node_id;
192                 new->path.apic.core_id = i;
193
194 #if 1
195                 printk_debug("CPU: %u has sibling %u\n", 
196                         cpu->path.apic.apic_id,
197                         new->path.apic.apic_id);
198 #endif
199
200                 if(new->enabled && !new->initialized)
201                         start_cpu(new);
202         }
203 }
204 #endif
205