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