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#include "kernel/kernel.h"
#include <stdbool.h>
#include "asm/x86.h"
#include "smp.h"
typedef struct mp_fps_struct
{
uint32_t sig; //signature "_MP_"
uint32_t conf; //pointer to config struct
uint8_t length; //should be 1
uint8_t version; // 1=1.1, 4=1.4
uint8_t checksum;
uint8_t features1;
uint8_t features2;
uint8_t res1; //reserved
uint8_t res2;
uint8_t res3;
}mp_fps;
typedef struct mp_config_struct
{
uint32_t sig; //signature "PCMP"
uint16_t length; //base table length
uint8_t version; //revision 1=1.1 4=1.4
uint8_t checksum;
uint32_t oemid1; //OEM id (ascii)
uint32_t oemid2;
uint32_t prodid1; //Product id (ascii)
uint32_t prodid2;
uint32_t prodid3;
uint32_t oem_table; //pointer (optional)
uint16_t oem_size; //size of this table
uint16_t entries; //entry count (following the header)
uint32_t local_apic; //local apic address (same for every cpu)
uint16_t length_ext; //extended table length (optional)
uint8_t check_ext; //checksum for ext. table
}mp_config;
typedef struct proc_struct
{
uint8_t type; //0=processor
uint8_t apic_id;
uint8_t apic_ver;
uint8_t cpu_bits;
uint32_t cpu_sig;
uint32_t cpu_flags;
}proc_entry;
//entries are sorted. (otherwise ignore. bochs!)
uint8_t *walk_mp_table(uint8_t *start_addr,smp_processors *smp)
{
if(*start_addr==0x0||*start_addr==0x2)
klog("entry type: %d",*start_addr);
// that is a processor
if(*start_addr==0x00)
{
proc_entry *pro=start_addr;
klog("local apic id: %02X",pro->apic_id);
klog("cpu enabled bit: %s",pro->cpu_bits&1?"yes":"no");
klog("bootstrap cpu bit: %s",pro->cpu_bits&2?"yes":"no");
// that is a enabled processor
if(pro->cpu_bits&1)
{
if(smp->processors>=SMP_MAX_PROC)
kpanic("we do not support that many processors. recompile with higher SMP_MAX_PROC.");
smp->local_apic_id[smp->processors]=pro->apic_id;
// that is the bootstrap processor
if(pro->cpu_bits&2)smp->boot=smp->processors;
smp->processors++;
}
return start_addr+20;
}
return start_addr+8;
}
void do_mp_conf(mp_config *addr,smp_processors *procdata)
{
char buf[]="XXXX";
uint32_t *buf_addr=buf;
*buf_addr=addr->sig;
klog("mp_config table addr: %08X",addr);
klog("mp_config signature: %s",buf);
klog("mp_config version: %02X",addr->version);
klog("mp_config # of entries: %d",addr->entries);
klog("mp_config local apic addr: 0x%08X",addr->local_apic);
klog("mp_config tabel length: %d",addr->length);
uint8_t *start_addr=addr;
start_addr+=44;
procdata->processors=0;
procdata->local_apic_address=addr->local_apic;
for(int i=0;i<addr->entries;i++)
{
start_addr=walk_mp_table(start_addr,procdata);
}
}
bool do_mp_fps(mp_fps *addr,smp_processors *procdata)
{
if(addr->length!=1)return false;
if(addr->version!=1&&addr->version!=4)return false;
char buf[]="XXXX";
uint32_t *buf_addr=buf;
*buf_addr=addr->sig;
klog("signature: %s",buf);
klog("conf: %08X",addr->conf);
klog("ver: %02X",addr->version);
klog("f1: %02X",addr->features1);
if(addr->features1!=0)kpanic("Intel default config not supported yet!");
do_mp_conf(addr->conf,procdata);
return true;
}
// todo: check checksum,version etc. and narrow down search
bool mp_find(smp_processors *procdata)
{
klog("Looking for Mp Floating Ponter Struct...");
uint8_t *addr=0x8000;
while(addr<=0xfffff)
{
if(!strcmp_l("_MP_",addr,4))
{
// klog("Found at 0x%04X",addr);
if(do_mp_fps(addr,procdata))return true;
}
addr++;
}
addr=0x190000-1025;
while(addr<=0x190000+1024)
{
if(!strcmp_l("_MP_",addr,4))
{
// klog("Found at 0x%04X",addr);
if(do_mp_fps(addr,procdata))return true;
}
addr++;
}
return false;
}
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