sysinit.s

来自「LEON3 SOC environment, PCI bridges.」· S 代码 · 共 44 行

#define MCFG1 0x233
#define MCFG2 0xe60
#define MCFG3 0
#define L2MCTRLIO 0x80000000
#define RAMSTART  0x40000000
#define RAMSIZE   0x00100000

#define CONSOLE 0x80000100
#define FREQ 80000000
#define BAUD 38400

	.seg    "text"
	.global _sysinit

_sysinit:

	set L2MCTRLIO, %g1
	set MCFG1, %g2
	st  %g2, [%g1]
	set MCFG2, %g2
	st  %g2, [%g1+4]
	set MCFG3, %g2
	st  %g2, [%g1+8]

	set RAMSTART+ RAMSIZE-32, %fp
	sub %fp, 96, %sp

	set CONSOLE, %o0
	set FREQ, %o1
	set BAUD, %o2
	call console_init
	nop

	call	_start
        sub     %sp, 0x40, %sp  	! room for main to save args
        nop

	mov	1, %g1
	ta 	0			! Halt if _main would return ...
	nop