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79 lines
1.1 KiB
ArmAsm
79 lines
1.1 KiB
ArmAsm
/*
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*
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* (c) 2005 Laurent Vivier <LaurentVivier@wanadoo.fr>
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* from BootX, (c) Benjamin Herrenschmidt
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*
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*/
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.chip 68020
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.include "copymem.i"
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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 PC(%sp)
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#define gpr(a) GPR + 8 * a(%sp)
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#define fpr(a) FPR + 8 * a(%sp)
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.align 4
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.global enter_kernelPPC
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enter_kernelPPC:
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link.w %fp,#-8
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/* get physical start address of kernel */
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move.l 8(%fp), %a0
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/* size of image to relocate */
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move.l 12(%fp), %d0
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/* destination addresse */
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move.l 16(%fp), %a2
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/* copy kernel to destination address */
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move.l %a2, %a1
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copymem %a0, %a2, %d0
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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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move.l #0x426f6f58, gpr(3) /* 'BooX' */
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move.l #bootx_infos, gpr(4)
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move.l #0, gpr(5)
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/* set up program counter */
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move.l %a1, pc
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/* Switch to PPC */
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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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wait:
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dc.w 0xFE03
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beq wait
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rts
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.global end_enter_kernelPPC
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end_enter_kernelPPC:
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