/*
* $Id
*/
#include <efi332.h>
#include <sim.h>
#define __START_C__
#include "bsp.h"
m68k_isr_entry M68Kvec[256];
m68k_isr_entry vectors[256];
char * const __argv[]= {"main", ""};
char * const __env[]= {""};
/*
* This prototype really should have the noreturn attribute but
* that causes a warning since it appears that the routine does
* return.
*
* void dumby_start () __attribute__ ((noreturn));
*/
void dumby_start ();
void dumby_start() {
void boot_card();
/* We need to by-pass the link instruction since the RAM chip-
select pins are not yet configured. */
asm volatile ( ".global start ;
start:");
/* disable interrupts, load stack pointer */
asm volatile ( "oriw #0x0700, %sr;
moveal #M68Kvec, %a0;
movec %a0, %vbr;
movel #_end, %d0;
addl " STACK_SIZE ",%d0;
movel %d0,%sp;
link %a6, #0"
);
/* include in ram_init.S */
/*
* Initalize the SIM module.
* The stack pointer is not usable until the RAM chip select lines
* are configured. The following code must remain inline.
*/
/* Module Configuration Register */
/* see section(s) 3.1.3-3.1.6 of the SIM Reference Manual */
*SIMCR = (unsigned short int)
(FRZSW | FRZBM | SAM(0,8,SHEN) | (MM*SIM_MM) | SAM(SIM_IARB,0,IARB));
/* Synthesizer Control Register */
/* see section(s) 4.8 */
/* end include in ram_init.S */
*SYNCR = (unsigned short int)
( SAM(EFI_W,15,W) | SAM(0x0,14,X) | SAM(EFI_Y,8,Y) | STSIM );
while (! (*SYNCR & SLOCK)); /* protect from clock overshoot */
/* include in ram_init.S */
*SYNCR = (unsigned short int)
( SAM(EFI_W,15,W) | SAM(EFI_X,14,X) | SAM(EFI_Y,8,Y) | STSIM );
/* System Protection Control Register */
/* !!! can only write to once after reset !!! */
/* see section 3.8.4 of the SIM Reference Manual */
*SYPCR = (unsigned char)( SAM(0x3,4,SWT) | 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(EFI_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 */
/* Port C Data */
/* load values before enabled */
*PORTC = (unsigned char) 0x0;
/* Chip-Select Base Address Register */
/* see section 7 of the SIM Reference Manual */
*CSBARBT = (unsigned short int)
(((0x000000 >> 8)&0xfff8) | BS_512K ); /* 512k bytes located at 0x0000 */
*CSBAR0 = (unsigned short int)
(((0x000000 >> 8)&0xfff8) | BS_1M ); /* 1M bytes located at 0x0000 */
*CSBAR1 = (unsigned short int)
(((0x080000 >> 8)&0xfff8) | BS_256K ); /* 256k bytes located at 0x80000 */
*CSBAR2 = (unsigned short int)
(((0x080000 >> 8)&0xfff8) | BS_256K ); /* 256 bytes located at 0x80000 */
*CSBAR3 = (unsigned short int)
(0xfff8 | BS_64K); /* AVEC interrupts */
*CSBAR10 = (unsigned short int)
(((0x000000 >> 8)&0xfff8) | BS_512K ); /* 512k bytes located at 0x0000 */
/* Chip-Select Options Registers */
/* see section 7 of the SIM Reference Manual */
*CSORBT = (unsigned short int)
( BothBytes | ReadWrite | SyncAS | WaitStates_13 | UserSupSpace );
*CSOR0 = (unsigned short int)
( BothBytes | ReadOnly | SyncAS | External | UserSupSpace );
*CSOR1 = (unsigned short int)
( LowerByte | ReadWrite | SyncAS | FastTerm | UserSupSpace );
*CSOR2 = (unsigned short int)
( UpperByte | ReadWrite | SyncAS | FastTerm | UserSupSpace );
*CSOR3 = (unsigned short int)
( BothBytes | ReadWrite | SyncAS | CPUSpace | IPLevel_any | AVEC );
*CSOR10 = (unsigned short int)
( BothBytes | ReadOnly | SyncAS | External | UserSupSpace );
/* Chip Select Pin Assignment Register 0 */
/* see section 7 of the SIM Reference Manual */
*CSPAR0 = (unsigned short int)(
SAM(DisOut,CS_5,0x3000) | /* PC2 */
SAM(DisOut,CS_4,0x0c00) | /* PC1 */
SAM(DisOut,CS_3,0x0300) | /* AVEC (internally) */
SAM(CS16bit,CS_2,0x00c0)| /* RAM UDS */
SAM(CS16bit,CS_1,0x0030)| /* RAM LDS */
SAM(CS16bit,CS_0,0x000c)| /* W/!R */
SAM(CS16bit,CSBOOT,0x0003) /* ROM DS */
);
/* Chip Select Pin Assignment Register 1 */
/* see section 7 of the SIM Reference Manual */
*CSPAR1 = (unsigned short int)(
SAM(CS16bit,CS_10,0x300)| /* ECLK */
SAM(DisOut,CS_9,0x0c0) | /* PC6 */
SAM(DisOut,CS_8,0x030) | /* PC5 */
SAM(DisOut,CS_7,0x00c) | /* PC4 */
SAM(DisOut,CS_6,0x003) /* PC3 */
);
/* 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 */
/* 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 = _endtext;
register char *dst = _sdata;
if (_copy_data_from_rom)
/* ROM has data at end of text; copy it. */
while (dst < _edata)
*dst++ = *src++;
/* Zero bss */
for (dst = __bss_start; dst< _end; dst++)
*dst = 0;
}
/*
* Initalize the board.
*/
Spurious_Initialize();
console_init();
/*
* Execute main with arguments argv and environment env
*/
/* main(1, __argv, __env); */
boot_card();
reboot();
}
void reboot() {asm("trap #15");}
