/*
* Boot a specified local disk. AX specifies the BIOS disk number; or
* -1 in case we should execute INT 18h ("next device.")
*/
__export void local_boot(int16_t ax)
{
com32sys_t ireg, oreg;
int i;
memset(&ireg, 0, sizeof(ireg));
syslinux_force_text_mode();
writestr(LOCALBOOT_MSG);
crlf();
cleanup_hardware();
if (ax == -1) {
/* Hope this does the right thing */
__intcall(0x18, &zero_regs, NULL);
/* If we returned, oh boy... */
kaboom();
}
/*
* Load boot sector from the specified BIOS device and jump to
* it.
*/
memset(&ireg, 0, sizeof ireg);
ireg.edx.b[0] = ax & 0xff;
ireg.eax.w[0] = 0; /* Reset drive */
__intcall(0x13, &ireg, NULL);
memset(&ireg, 0, sizeof(ireg));
ireg.eax.w[0] = 0x0201; /* Read one sector */
ireg.ecx.w[0] = 0x0001; /* C/H/S = 0/0/1 (first sector) */
ireg.ebx.w[0] = OFFS(trackbuf);
ireg.es = SEG(trackbuf);
for (i = 0; i < retry_count; i++) {
__intcall(0x13, &ireg, &oreg);
if (!(oreg.eflags.l & EFLAGS_CF))
break;
}
if (i == retry_count)
kaboom();
cli(); /* Abandon hope, ye who enter here */
memcpy((void *)0x07C00, trackbuf, 512);
ireg.esi.w[0] = OFFS(trackbuf);
ireg.edi.w[0] = 0x07C00;
ireg.edx.w[0] = ax;
call16(local_boot16, &ireg, NULL);
}
int main( int argc, char* argv[] ) {
//test_system_idle_instrumented();
//bwprintf(COM2, "Starting Kernel!");
//bwsetfifo(COM2,OFF);
//create the globals structure
struct kern_globals GLOBAL;
struct request* req;
//2385260
//0x2E56C
/*
bwprintf(COM2, "TID[%d]\tPC[%d]\tPRIOR[%d]\n\n", GLOBAL.ACTIVE_TASK->task_id, GLOBAL.ACTIVE_TASK->pc, GLOBAL.ACTIVE_TASK->priority);
bwprintf(COM2, "REQ_NUM[%d]\n", GLOBAL.ACTIVE_TASK->req->req_num);
bwprintf(COM2, "SND_TID[%d]\n", ((struct request_send*)GLOBAL.ACTIVE_TASK->req)->Tid);
bwprintf(COM2, "\tSND_STATE[%d]\n", GLOBAL.USER_TDS[((struct request_send*)GLOBAL.ACTIVE_TASK->req)->Tid].td_state);
bwprintf(COM2, "\tSND_PRIOR[%d]\n", GLOBAL.USER_TDS[((struct request_send*)GLOBAL.ACTIVE_TASK->req)->Tid].priority);
bwprintf(COM2, "\tSND_PC[%x]\n", GLOBAL.USER_TDS[((struct request_send*)GLOBAL.ACTIVE_TASK->req)->Tid].pc);
bwprintf(COM2, "\tSND_REQ_NUM[%d]\n", GLOBAL.USER_TDS[((struct request_send*)GLOBAL.ACTIVE_TASK->req)->Tid].req->req_num);
bwprintf(COM2, "\t\tSND_REQ_MSG[%x]\n", ((struct request_receive*)GLOBAL.USER_TDS[((struct request_send*)GLOBAL.ACTIVE_TASK->req)->Tid].req)->msg);
bwprintf(COM2, "\t\tSND_REQ_MSG_LEN[%d]\n", ((struct request_receive*)GLOBAL.USER_TDS[((struct request_send*)GLOBAL.ACTIVE_TASK->req)->Tid].req)->msglen);
bwprintf(COM2, "\t\tSND_REQ_NUM[%d]\n", ((struct request_receive*)GLOBAL.USER_TDS[((struct request_send*)GLOBAL.ACTIVE_TASK->req)->Tid].req)->req_num);
bwprintf(COM2, "\t\tSND_REQ_TID_POINTER[%x]\n", ((struct request_receive*)GLOBAL.USER_TDS[((struct request_send*)GLOBAL.ACTIVE_TASK->req)->Tid].req)->tid);
bwprintf(COM2, "ROUTE_SRV_TID[45]\n", GLOBAL.USER_TDS[((struct request_send*)GLOBAL.ACTIVE_TASK->req)->Tid].req->req_num);
bwprintf(COM2, "\tROUTE_SRV_STACK_BOTTOM[%x]\n", GLOBAL.USER_TDS[45].stack_space_bottom);
bwprintf(COM2, "\tROUTE_SRV_STACK_TOP[%x]\n", GLOBAL.USER_TDS[45].stack_space_top);
bwprintf(COM2, "\tROUTE_SRV_STACK_POINTER[%x]\n", GLOBAL.USER_TDS[45].sp);
//bwprintf(COM2, "\tROUTE_SRV_ROUTE_STRUCT_SIZE[%x]\n");
bwprintf(COM2, "MSG_POINTER[%x]\n", ((struct request_send*)GLOBAL.ACTIVE_TASK->req)->msg);
bwprintf(COM2, "\tMSG[0] = [%d]\n", ((int*)((struct request_send*)GLOBAL.ACTIVE_TASK->req)->msg)[0]);
bwprintf(COM2, "\tMSG[1] = [%d]\n", ((int*)((struct request_send*)GLOBAL.ACTIVE_TASK->req)->msg)[1]);
bwprintf(COM2, "\tMSG_LEN[%d]\n", ((struct request_send*)GLOBAL.ACTIVE_TASK->req)->msglen);
bwprintf(COM2, "RPL_POINTER[%d]\n", ((struct request_send*)GLOBAL.ACTIVE_TASK->req)->reply);
bwprintf(COM2, "\tRPL_LEN[%d]\n", ((struct request_send*)GLOBAL.ACTIVE_TASK->req)->replylen);
bwgetc(COM2);
*/
//loop through all of the tds and find the task id with the greatest
//number of blocked tasks on it, along with its task id
/*
int tdindex = 0;
int block_max = 0;
int i = 0;
for(i = 0; i < TID_INDEX_MASK + 1; i++){
int sqs = GLOBAL.USER_TDS[i].send_Q_size;
if(sqs > block_max){
block_max = sqs;
tdindex = i;
}
}*/
//bwprintf(COM2, "\n\nBLK[%d] TD_IND[%d] TID[%d] PRIOR[%d]\n\n", block_max, tdindex, GLOBAL.USER_TDS[tdindex].task_id, GLOBAL.USER_TDS[tdindex].priority);
//bwgetc(COM2);
initialize_globals(&GLOBAL);
initialize_first_task(&GLOBAL);
initialize_hardware();
while(1){
req = NULL;
if(GLOBAL.SCHEDULER.highest_priority == -1){ return 0; } //NO TASKS
GLOBAL.ACTIVE_TASK = schedule(&GLOBAL);
req = kerexit(GLOBAL.ACTIVE_TASK);
//check for quit
if(req->req_num == SYSCALL_QUIT){ return 0; }
kernel_assert(req != NULL, "req != NULL")
handle_request(&GLOBAL, req);
}
bwprintf(COM2, "GoodBye World\n\n");
cleanup_hardware();
return 0;
}
