void gdb_pc_com_init(int com_port, struct termios *com_params)
{
int com_irq = com_port & 1 ? 4 : 3;
/* Tell the generic serial GDB code
how to send and receive characters. */
gdb_serial_recv = gdb_cons_getchar;
gdb_serial_send = gdb_cons_putchar;
gdb_com_port = com_port;
/* Tell the GDB proxy trap handler to use the serial stub. */
gdb_signal = gdb_serial_signal;
/*
* Stick in gdb's special trap handler.
* This gets called before base_trap_handlers is consulted.
* If it returns zero, the normal handler is circumvented entirely;
* if it returns nonzero, the normal handler runs next.
*/
base_trap_gdb_handler = gdb_trap_ss;
/*
* Initialize the serial port.
* If no com_params were specified by the caller,
* then default to base_raw_termios.
* (If we just passed through the NULL,
* then com_cons_init would default to base_cooked_termios,
* which messes up the GDB remote debugging protocol.)
*/
if (com_params == 0)
com_params = &base_raw_termios;
com_cons_init(com_port, com_params);
#ifdef KNIT
set_irq_handler(com_irq,gdb_pc_com_intr);
com_cons_enable_receive_interrupt(com_port);
#else
/* Hook the COM port's hardware interrupt.
The com_cons itself uses only polling for communication;
the interrupt is only used to allow the remote debugger
to stop us at any point, e.g. when the user presses CTRL-C. */
fill_irq_gate(com_irq, (unsigned)gdb_pc_com_intr, KERNEL_CS, ACC_PL_K);
/* Enable the COM port interrupt. */
com_cons_enable_receive_interrupt(com_port);
pic_enable_irq(com_irq);
#endif
}
// the kernel bootstrap routine
PUBLIC
void
kernel_thread_t::bootstrap()
{
// Initializations done -- helping_lock_t can now use helping lock
helping_lock_t::threading_system_active = true;
//
// set up my own thread control block
//
state_change (0, Thread_running);
sched()->set_prio (config::kernel_prio);
sched()->set_mcp (config::kernel_mcp);
sched()->set_timeslice (config::default_time_slice);
sched()->set_ticks_left (config::default_time_slice);
present_next = present_prev = this;
ready_next = ready_prev = this;
//
// set up class variables
//
for (int i = 0; i < 256; i++) prio_next[i] = prio_first[i] = 0;
prio_next[config::kernel_prio] = prio_first[config::kernel_prio] = this;
prio_highest = config::kernel_prio;
timeslice_ticks_left = config::default_time_slice;
timeslice_owner = this;
//
// install our slow trap handler
//
nested_trap_handler = base_trap_handler;
base_trap_handler = thread_handle_trap;
//
// initialize FPU
//
set_ts(); // FPU ops -> exception
//
// initialize interrupts
//
irq_t::lookup(2)->alloc(this, false); // reserve cascade irq
irq_t::lookup(8)->alloc(this, false); // reserve timer irq
pic_enable_irq(2); // allow cascaded irqs
// set up serial console
if (! strstr(kmem::cmdline(), " -I-")
&& !strstr(kmem::cmdline(), " -irqcom"))
{
int com_port = console::serial_com_port;
int com_irq = com_port & 1 ? 4 : 3;
irq_t::lookup(com_irq)->alloc(this, false); // the remote-gdb interrupt
pic_enable_irq(com_irq);
// for some reason, we have to re-enable the com irq here
if (config::serial_esc)
com_cons_enable_receive_interrupt();
}
// initialize the profiling timer
bool user_irq0 = strstr(kmem::cmdline(), "irq0");
if (config::profiling)
{
if (user_irq0)
{
kdb_ke("options `-profile' and `-irq0' don't mix "
"-- disabling `-irq0'");
}
irq_t::lookup(0)->alloc(this, false);
profile::init();
if (strstr(kmem::cmdline(), " -profstart"))
profile::start();
}
else if (! user_irq0)
irq_t::lookup(0)->alloc(this, false); // reserve irq0 even though
// we don't use it
//
// set up timer interrupt (~ 1ms)
//
while (rtcin(RTC_STATUSA) & RTCSA_TUP) ; // wait till RTC ready
rtcout(RTC_STATUSA, RTCSA_DIVIDER | RTCSA_1024); // 1024 Hz
// set up 1024 Hz interrupt
rtcout(RTC_STATUSB, rtcin(RTC_STATUSB) | RTCSB_PINTR | RTCSB_SQWE);
rtcin(RTC_INTR); // reset
pic_enable_irq(8); // allow this interrupt
//
// set PCE-Flag in CR4 to enable read of performace measurement counters
// in usermode. PMC were introduced in Pentium MMX and PPro processors.
//
#ifndef CPUF_MMX
#define CPUF_MMX 0x00800000
#endif
if(strncmp(cpu.vendor_id, "GenuineIntel", 12) == 0
&& (cpu.family == CPU_FAMILY_PENTIUM_PRO ||
cpu.feature_flags & CPUF_MMX))
{
set_cr4(get_cr4() | CR4_PCE);
}
//
// allow the boot task to create more tasks
//
for (unsigned i = config::boot_taskno + 1;
i < space_index_t::max_space_number;
i++)
{
check(space_index_t(i).set_chief(space_index(),
space_index_t(config::boot_taskno)));
}
//
// create sigma0
//
// sigma0's chief is the boot task
space_index_t(config::sigma0_id.id.task).
set_chief(space_index(), space_index_t(config::sigma0_id.id.chief));
sigma0 = new space_t(config::sigma0_id.id.task);
sigma0_thread =
new (&config::sigma0_id) thread_t (sigma0, &config::sigma0_id,
config::sigma0_prio,
config::sigma0_mcp);
// push address of kernel info page to sigma0's stack
vm_offset_t esp = kmem::info()->sigma0_esp;
* reinterpret_cast<vm_offset_t*>(kmem::phys_to_virt(--esp))
= kmem::virt_to_phys(kmem::info());
sigma0_thread->initialize(kmem::info()->sigma0_eip, esp,
0, 0);
//
// create the boot task
//
// the boot task's chief is the boot task itself
space_index_t(config::boot_id.id.task).
set_chief(space_index(), space_index_t(config::boot_id.id.chief));
space_t *boot = new space_t(config::boot_id.id.task);
thread_t *boot_thread
= new (&config::boot_id) thread_t (boot, &config::boot_id,
config::boot_prio,
config::boot_mcp);
boot_thread->initialize(0x200000,
0x200000,
sigma0_thread, 0);
//
// the idle loop
//
for (;;)
{
// printf("I");
sti(); // enable irqs, otherwise idling is fatal
if (config::hlt_works_ok)
asm("hlt"); // stop the CPU, waiting for an int
while (ready_next != this) // are there any other threads ready?
schedule();
}
}
