void bsp_start (void)
{
/* initialize irq management */
BSP_rtems_irq_mngt_init ();
/* setup console mode for lower screen */
irqEnable (IRQ_VBLANK);
videoSetMode (0);
videoSetModeSub (MODE_0_2D | DISPLAY_BG0_ACTIVE);
vramSetBankC (VRAM_C_SUB_BG);
SUB_BG0_CR = BG_MAP_BASE (31);
BG_PALETTE_SUB[255] = RGB15 (31, 31, 31);
consoleInitDefault ((u16 *) SCREEN_BASE_BLOCK_SUB (31),
(u16 *) CHAR_BASE_BLOCK_SUB (0), 16);
/* print status message */
printk ("[+] kernel console started\n");
/* set the cpu mode to system user */
arm_cpu_mode = 0x1f;
/* configure clock period */
Configuration.microseconds_per_tick = 10000; /* us */
defaultExceptionHandler ();
}
static void _bsp_start(void)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
uintptr_t intrStackStart = CPU_UP_ALIGN((uint32_t)__bsp_ram_start);
uintptr_t intrStackSize = rtems_configuration_get_interrupt_stack_size();
/*
* Initialize default raw exception handlers.
*
* This BSP does not assume anything about firmware possibly loaded in the
* FPGA, so the external interrupt should not be enabled in order to avoid
* spurious interrupts.
*/
sc = ppc_exc_initialize(PPC_INTERRUPT_DISABLE_MASK_DEFAULT & ~MSR_EE,
intrStackStart,
intrStackSize);
if (sc != RTEMS_SUCCESSFUL) BSP_panic("Cannot initialize exceptions");
/* Install our own set of exception vectors */
BSP_rtems_irq_mngt_init(0);
}
/*
* BSP start routine. Called by boot_card().
*
* This routine does the bulk of the system initialization.
*/
void bsp_start(void)
{
uintptr_t intrStackStart;
uintptr_t intrStackSize;
ppc_cpu_id_t myCpu;
ppc_cpu_revision_t myCpuRevision;
/* Set the character output function; The application may override this */
BSP_output_char = __bsp_outchar_to_memory;
printk("RTEMS %s\n", rtems_get_version_string());
/*
* Get CPU identification dynamically. Note that the get_ppc_cpu_type()
* function stores the result in global variables so that it can be used later...
*/
myCpu = get_ppc_cpu_type();
myCpuRevision = get_ppc_cpu_revision();
printk("CPU: 0x%04x, Revision: 0x%04x = %d, Name: %s\n",
myCpu, myCpuRevision, myCpuRevision, get_ppc_cpu_type_name(myCpu));
/*
* Initialize the device driver parameters
*/
/* Timebase register ticks/microsecond; The application may override these */
bsp_clicks_per_usec = 350;
bsp_timer_internal_clock = true;
bsp_timer_average_overhead = 2;
bsp_timer_least_valid = 3;
rtems_counter_initialize_converter(bsp_clicks_per_usec * 1000000);
/*
* Initialize the interrupt related settings.
*/
intrStackStart = CPU_UP_ALIGN((uint32_t)__bsp_ram_start);
intrStackSize = rtems_configuration_get_interrupt_stack_size();
ppc_exc_initialize(intrStackStart, intrStackSize);
/* Let the user know what parameters we were compiled with */
printk(" Base/Start End Size\n"
"RAM: 0x%08x 0x%x\n"
"RTEMS: 0x%08x\n"
"Interrupt Stack: 0x%08x 0x%x\n"
"Stack: 0x%08x 0x%08x 0x%x\n"
"Workspace: 0x%08x 0x%08x\n"
"MsgArea: 0x%08x 0x%x\n"
"Physical RAM 0x%08x\n",
(uint32_t)RamBase, (uint32_t)RamSize,
(uint32_t)__rtems_end,
intrStackStart, intrStackSize,
(uint32_t)__stack_base, (uint32_t)_stack, (uint32_t)StackSize,
(uint32_t)WorkAreaBase, (uint32_t)__bsp_ram_end,
(uint32_t)MsgAreaBase, (uint32_t)MsgAreaSize,
(uint32_t)__phy_ram_end);
/*
* Initialize RTEMS IRQ system
*/
BSP_rtems_irq_mngt_init(0);
/* Continue with application-specific initialization */
app_bsp_start();
}