2007-02-02 20:13:11 +00:00
|
|
|
/*
|
|
|
|
|
*
|
|
|
|
|
* (c) 2005-2007 Laurent Vivier <Laurent@lvivier.info>
|
|
|
|
|
* from BootX, (c) Benjamin Herrenschmidt
|
|
|
|
|
*
|
|
|
|
|
*/
|
|
|
|
|
|
2007-03-22 15:36:39 +00:00
|
|
|
.cpu 68020
|
2007-02-02 20:13:11 +00:00
|
|
|
|
|
|
|
|
.equ PC, 0x00FC
|
|
|
|
|
.equ GPR, 0x0100
|
|
|
|
|
.equ FPR, 0x0200
|
|
|
|
|
|
|
|
|
|
#define pc %sp@(PC)
|
|
|
|
|
#define gpr(a) %sp@(GPR + 8 * a + 4)
|
|
|
|
|
#define fpr0(a) %sp@(FPR + 8 * a)
|
|
|
|
|
#define fpr1(a) %sp@(FPR + 8 * a + 4)
|
|
|
|
|
|
|
|
|
|
.macro copy_PC
|
|
|
|
|
move.l %a1@+, pc
|
|
|
|
|
.endm
|
|
|
|
|
|
|
|
|
|
.macro copy_GPR from=0, to=31
|
|
|
|
|
move.l %a1@+, gpr(\from)
|
|
|
|
|
.if \to-\from
|
|
|
|
|
copy_GPR "(\from+1)",\to
|
|
|
|
|
.endif
|
|
|
|
|
.endm
|
|
|
|
|
|
|
|
|
|
.macro copy_FPR from=0, to=31
|
|
|
|
|
move.l %a1@+, fpr0(\from)
|
|
|
|
|
move.l %a1@+, fpr1(\from)
|
|
|
|
|
.if \to-\from
|
|
|
|
|
copy_FPR "(\from+1)",\to
|
|
|
|
|
.endif
|
|
|
|
|
.endm
|
|
|
|
|
|
|
|
|
|
.macro _EnterPPC
|
|
|
|
|
move.l #0x47617279, %a0 /* 'Gary' */
|
|
|
|
|
move.l #0x05051956, %a1
|
|
|
|
|
move.l #0x0000C000, %d0
|
|
|
|
|
moveq #0, %d2
|
|
|
|
|
reset
|
|
|
|
|
|
|
|
|
|
move.l %sp,-(%sp)
|
|
|
|
|
0:
|
|
|
|
|
dc.w 0xFE03
|
|
|
|
|
beq 0b
|
|
|
|
|
.endm
|
|
|
|
|
|
|
|
|
|
.align 4
|
|
|
|
|
|
|
|
|
|
.global switch_to_PPC
|
|
|
|
|
switch_to_PPC:
|
|
|
|
|
link.w %fp,#0
|
|
|
|
|
|
|
|
|
|
/* get PPC registers values */
|
|
|
|
|
|
|
|
|
|
move.l 8(%fp), %a1
|
|
|
|
|
|
|
|
|
|
/* prepare stack */
|
|
|
|
|
|
|
|
|
|
move.l %sp, %d0
|
|
|
|
|
andi.l #0xFFFFFC00, %d0
|
|
|
|
|
move.l %d0, %sp
|
|
|
|
|
move.l #0x00BF, %d0
|
|
|
|
|
loop:
|
|
|
|
|
clr.l -(%sp)
|
|
|
|
|
dbra %d0, loop
|
|
|
|
|
|
|
|
|
|
/* Initialize PPC registers */
|
|
|
|
|
|
|
|
|
|
copy_PC
|
|
|
|
|
copy_GPR
|
|
|
|
|
copy_FPR
|
|
|
|
|
|
|
|
|
|
/* Switch to PPC */
|
|
|
|
|
|
|
|
|
|
_EnterPPC
|
|
|
|
|
|
|
|
|
|
unlk %fp
|
|
|
|
|
rts
|
