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/* 2004.12 yhlu add dual core support */
#include <console/console.h>
#include <cpu/cpu.h>
#include <cpu/x86/lapic.h>
#include <cpu/amd/multicore.h>
#include <device/device.h>
#include <device/pci.h>
#include <pc80/mc146818rtc.h>
#include <smp/spinlock.h>
#include <cpu/x86/mtrr.h>
#include <cpu/amd/model_fxx_msr.h>
#include <cpu/amd/model_fxx_rev.h>
#include <cpu/amd/amdk8_sysconf.h>
static int disable_siblings = !CONFIG_LOGICAL_CPUS;
#include "dualcore_id.c"
static int get_max_siblings(int nodes)
{
device_t dev;
int nodeid;
int siblings=0;
//get max siblings from all the nodes
for(nodeid=0; nodeid<nodes; nodeid++){
int j;
dev = dev_find_slot(0, PCI_DEVFN(0x18+nodeid, 3));
j = (pci_read_config32(dev, 0xe8) >> 12) & 3;
if(siblings < j) {
siblings = j;
}
}
return siblings;
}
static void enable_apic_ext_id(int nodes)
{
device_t dev;
int nodeid;
//enable APIC_EXIT_ID all the nodes
for(nodeid=0; nodeid<nodes; nodeid++){
uint32_t val;
dev = dev_find_slot(0, PCI_DEVFN(0x18+nodeid, 0));
val = pci_read_config32(dev, 0x68);
val |= (1<<17)|(1<<18);
pci_write_config32(dev, 0x68, val);
}
}
unsigned get_apicid_base(unsigned ioapic_num)
{
device_t dev;
int nodes;
unsigned apicid_base;
int siblings;
unsigned nb_cfg_54;
int bsp_apic_id = lapicid(); // bsp apicid
get_option(&disable_siblings, "multi_core");
//get the nodes number
dev = dev_find_slot(0, PCI_DEVFN(0x18,0));
nodes = ((pci_read_config32(dev, 0x60)>>4) & 7) + 1;
siblings = get_max_siblings(nodes);
if(bsp_apic_id > 0) { // io apic could start from 0
return 0;
} else if(pci_read_config32(dev, 0x68) & ( (1<<17) | (1<<18)) ) { // enabled ext id but bsp = 0
return 1;
}
nb_cfg_54 = read_nb_cfg_54();
#if 0
//it is for all e0 single core and nc_cfg_54 low is set, but in the romstage.c stage we do not set that bit for it.
if(nb_cfg_54 && (!disable_siblings) && (siblings == 0)) {
//we need to check if e0 single core is there
int i;
for(i=0; i<nodes; i++) {
if(is_e0_later_in_bsp(i)) {
siblings = 1;
break;
}
}
}
#endif
//Construct apicid_base
if((!disable_siblings) && (siblings>0) ) {
/* for 8 way dual core, we will used up apicid 16:16, actually 16 is not allowed by current kernel
and the kernel will try to get one that is small than 16 to make io apic work.
I don't know when the kernel can support 256 apic id. (APIC_EXT_ID is enabled) */
//4:10 for two way 8:12 for four way 16:16 for eight way
//Use CONFIG_MAX_PHYSICAL_CPUS instead of nodes for better consistency?
apicid_base = nb_cfg_54 ? (siblings+1) * nodes : 8 * siblings + nodes;
}
else {
apicid_base = nodes;
}
if((apicid_base+ioapic_num-1)>0xf) {
// We need to enable APIC EXT ID
printk(BIOS_INFO, "if the IO APIC device doesn't support 256 apic id, \n you need to set CONFIG_ENABLE_APIC_EXT_ID in romstage.c so you can spare 16 id for ioapic\n");
enable_apic_ext_id(nodes);
}
return apicid_base;
}
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