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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