boott.s

来自「LEON3 SOC environment, PCI bridges.」· S 代码 · 共 94 行

#define MCFG1 0x233
/*#define MCFG2 0xe60 */
#define MCFG2 0xE638562A
#define MCFG3 0x100000
#define L2MCTRLIO 0x80000000
#define RAMSTART  0x40000000
#define RAMSIZE   0x00080000

	.seg	"text"
	.proc	0
	.align	4
	.global start
start:

	flush
	set 0x10c0, %g1		! init IU
	mov %g1, %psr
	mov %g0, %wim
	mov %g0, %tbr
	mov %g0, %y
	nop
	set  0x1000f, %g1
	sta %g1, [%g0] 2

2:
	mov %asr17, %g3
	and %g3, 0x1f, %g3
	mov %g0, %g4
	mov %g0, %g5
	mov %g0, %g6
	mov %g0, %g7
1:
	mov %g0, %l0
	mov %g0, %l1
	mov %g0, %l2
	mov %g0, %l3
	mov %g0, %l4
	mov %g0, %l5
	mov %g0, %l6
	mov %g0, %l7
	mov %g0, %o0
	mov %g0, %o1
	mov %g0, %o2
	mov %g0, %o3
	mov %g0, %o4
	mov %g0, %o5
	mov %g0, %o6
	mov %g0, %o7
	subcc %g3, 1, %g3
	bge 1b
	save

	mov	2, %g1
	mov	%g1, %wim
	set 0x10e0, %g1		! enable traps
	mov %g1, %psr
	nop; nop; nop;

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

/*	set 0xFFF00000, %g2
	set 0x60000000, %g1
	st %g1, [%g2]
	st %g1, [%g2-0x10] */
	set RAMSTART+ RAMSIZE-32, %fp
	sub %fp, 96, %sp

	st	%sp, [%sp]
	stb	%g0, [%sp]
	set 0x4567, %g1
	set 0x0123, %g2
	sth	%g1, [%sp]
	sth	%g2, [%sp+2]
	stb	%g1, [%sp+3]

   
	set 0x80000410, %g1 /* Map PCI target to AHB address 0x40000000 */
	set 0x40000000, %g2 
	st  %g2, [%g1]
loop:
	jmp loop

	set RAMSTART, %g1
	jmp %g1
	nop

.align	32