/**
* @file
*
* MRM332 C Start Up Code
*/
/*
* COPYRIGHT (c) 2000.
* Matt Cross <profesor@gweep.net>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*
*/
#include <bsp.h>
#include <bsp/bootcard.h>
#include <mrm332.h>
#include <rtems/m68k/sim.h>
#define __START_C__
/*
* This prototype really should have the noreturn attribute but
* that causes a warning. Not sure how to fix that.
*/
/* void dumby_start () __attribute__ ((noreturn)); */
void start_c(void);
void start_c(void) {
#ifdef SET_EDIV
#define OPTIONAL_EDIV EDIV
#else
#define OPTIONAL_EDIV 0
#endif
/* Synthesizer Control Register */
/* see section(s) 4.8 */
/* end include in ram_init.S */
*SYNCR = (unsigned short int) (SAM(MRM_W, 15, VCO) | SAM(0x0, 14, PRESCALE)
| SAM(MRM_Y, 8, COUNTER) | OPTIONAL_EDIV);
while (!(*SYNCR & SLOCK))
; /* protect from clock overshoot */
/* include in ram_init.S */
*SYNCR = (unsigned short int) (SAM(MRM_W, 15, VCO) | SAM(MRM_X, 14,
PRESCALE) | SAM(MRM_Y, 8, COUNTER) | OPTIONAL_EDIV);
/* System Protection Control Register */
/* !!! can only write to once after reset !!! */
/* see section 3.8.4 of the SIM Reference Manual */
*SYPCR = (unsigned char) (HME | BME);
/* Periodic Interrupr Control Register */
/* see section 3.8.2 of the SIM Reference Manual */
*PICR = (unsigned short int) (SAM(0, 8, PIRQL) | SAM(MRM_PIV, 0, PIV));
/* ^^^ zero disables interrupt, don't enable here or ram_init will
be wrong. It's enabled below. */
/* Periodic Interrupt Timer Register */
/* see section 3.8.3 of the SIM Reference Manual */
*PITR = (unsigned short int) (SAM(0x09, 0, PITM));
/* 1.098mS interrupt, assuming 32.768 KHz input clock */
/* Port C Data */
/* load values before enabled */
*PORTC = (unsigned char) 0x0;
/* Port E and F Data Register */
/* see section 9 of the SIM Reference Manual */
*PORTE0 = (unsigned char) 0;
*PORTF0 = (unsigned char) 0;
/* Port E and F Data Direction Register */
/* see section 9 of the SIM Reference Manual */
*DDRE = (unsigned char) 0xff;
*DDRF = (unsigned char) 0xfd;
/* Port E and F Pin Assignment Register. Set up Port E and F as I/O */
/* see section 9 of the SIM Reference Manual */
*PEPAR = (unsigned char) 0;
*PFPAR = (unsigned char) 0;
/* end of SIM initalization code */
/* end include in ram_init.S */
/*
* Initialize RAM by copying the .data section out of ROM (if
* needed) and "zero-ing" the .bss section.
*/
{
register char *src = _etext;
register char *dst = _copy_start;
if (_copy_data_from_rom) {
/* ROM has data at end of text; copy it. */
while (dst < _edata)
*dst++ = *src++;
}
/* Zero bss */
for (dst = _clear_start; dst < end; dst++) {
*dst = 0;
}
}
/*
* Initialize vector table.
*/
{
rtems_isr_entry *monitors_vector_table;
m68k_get_vbr(monitors_vector_table);
M68Kvec[4] = monitors_vector_table[4]; /* breakpoints vector */
M68Kvec[9] = monitors_vector_table[9]; /* trace vector */
M68Kvec[31] = monitors_vector_table[31]; /* level 7 interrupt */
M68Kvec[47] = monitors_vector_table[47]; /* system call vector */
M68Kvec[66] = monitors_vector_table[66]; /* user defined */
m68k_set_vbr(&M68Kvec);
}
/*
* Execute main with arguments argc and agrv.
*/
boot_card((void*)0);
reboot();
}
