Started adding APIC/multiprocessor support.

1 files changed, 140 insertions, 0 deletions

diff --git a/kernel/mp.c b/kernel/mp.c
new file mode 100644
index 0000000..213340b
--- /dev/null
+++ b/kernel/mp.c
@@ -0,0 +1,140 @@
+#define FOOLOS_MODULE_NAME "mp"
+
+#include "x86.h"
+#include "../lib/logger/log.h"	// logger facilities
+
+
+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;
+
+
+
+
+//entries are sorted, but we do not care.
+uint8_t *walk_mp_table(uint8_t *start_addr)
+{
+
+       	if(*start_addr==0x0||*start_addr==0x2)
+	     log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"entry type: %d",*start_addr);
+
+	if(*start_addr==0x00)return start_addr+20;
+	return start_addr+8;
+}
+
+void show_mp_conf(mp_config *addr)
+{
+	char buf[]="XXXX";
+	uint32_t *buf_addr=buf;
+	*buf_addr=addr->sig;
+
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"mp_config tabel addr: %08X",addr);
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"mp_config signature: %s",buf);
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"mp_config version: %02X",addr->version);
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"mp_config # of entries: %d",addr->entries);
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"mp_config local apic addr: 0x%08X",addr->local_apic);
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"mp_config tabel length: %d",addr->length);
+
+	uint8_t *start_addr=addr;
+	start_addr+=44;
+	for(int i=0;i<addr->entries;i++)
+	{
+//	    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"go 0x%08X",start_addr);
+	    start_addr=walk_mp_table(start_addr);
+
+	}
+
+
+}
+void show_mp_fps(mp_fps *addr)
+{
+    
+	if(addr->length!=1)return;
+	if(addr->version!=1&&addr->version!=4)return;
+
+	char buf[]="XXXX";
+	uint32_t *buf_addr=buf;
+	*buf_addr=addr->sig;
+
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"signature: %s",buf);
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"conf: %08X",addr->conf);
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"ver: %02X",addr->version);
+	log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"f1: %02X",addr->features1);
+
+	if(addr->features1!=0)panic(FOOLOS_MODULE_NAME,"Intel default config not supported yet!");
+	show_mp_conf(addr->conf);
+}
+
+bool check_mp(uint8_t *addr)
+{
+    char test[]="_MP_";
+
+    for(int i=0;i<4;i++)
+    {
+	if(test[i]!=*(addr+i))return false;
+
+    }
+
+    return true;
+
+}
+
+
+// todo: check checksum,version etc. and narrow down search
+bool find_mp()
+{
+
+    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"Looking for Mp Floating Ponter Struct...");
+    uint8_t *addr=0x80000;
+    while(addr<=0xfffff)
+    {
+	if(check_mp(addr))
+	{
+	    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"Found at 0x%04X",addr);
+	    show_mp_fps(addr);
+	}
+	addr++;
+    }
+
+
+    return true;
+
+}
+