| 1 | /* |
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| 2 | * This program is free software; you can redistribute it and/or modify |
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| 3 | * it under the terms of the GNU General Public License as published by |
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| 4 | * the Free Software Foundation; either version 2 of the License, or |
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| 5 | * (at your option) any later version. |
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| 6 | * |
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| 7 | * This program is distributed in the hope that it will be useful, |
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| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 10 | * GNU General Public License for more details. |
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| 11 | * |
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| 12 | * You should have received a copy of the GNU General Public License |
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| 13 | * along with this program; if not, write to the Free Software |
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| 14 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 15 | * |
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| 16 | * Copyright (C) 2005, 2006 IBM Corp. |
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| 17 | * |
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| 18 | * Authors: Jimi Xenidis <jimix@watson.ibm.com> |
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| 19 | * Hollis Blanchard <hollisb@us.ibm.com> |
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| 20 | * |
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| 21 | */ |
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| 22 | |
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| 23 | #include <asm/config.h> |
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| 24 | #include <asm/msr.h> |
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| 25 | #include <asm/processor.h> |
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| 26 | #include <asm/page.h> |
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| 27 | |
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| 28 | .globl _start |
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| 29 | _start: |
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| 30 | /* pass the original MSR along */ |
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| 31 | mfmsr r8 |
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| 32 | |
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| 33 | /* set initial MSR */ |
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| 34 | li r22, 0 |
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| 35 | ori r22, r22, (MSR_SF | MSR_HV) >> 48 |
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| 36 | sldi r22, r22, 48 |
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| 37 | mtmsrd r22 |
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| 38 | |
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| 39 | _start64: |
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| 40 | /* load up the stack */ |
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| 41 | SET_REG_TO_LABEL(r1, cpu0_stack) |
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| 42 | |
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| 43 | /* call the init function */ |
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| 44 | LOADADDR(r21,__start_xen_ppc) |
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| 45 | ld r2, 8(r21) |
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| 46 | ld r21, 0(r21) |
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| 47 | mtctr r21 |
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| 48 | bctrl |
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| 49 | /* should never return */ |
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| 50 | trap |
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| 51 | |
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| 52 | /* Note! GDB 6.3 makes the very stupid assumption that PC > SP means we are |
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| 53 | * in a Linux signal trampoline, and it begins groping for a struct |
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| 54 | * rt_sigframe on the stack. Naturally, this fails miserably for our |
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| 55 | * backtrace. To work around this behavior, we must make certain that our |
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| 56 | * stack is always above our text, e.g. in the data section. */ |
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| 57 | .data /* DO NOT REMOVE; see GDB note above */ |
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| 58 | .align 4 |
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| 59 | cpu0_stack_bottom: |
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| 60 | .space STACK_SIZE |
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| 61 | cpu0_stack: |
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| 62 | .space STACK_FRAME_OVERHEAD |
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