| Current Path : /sys/amd64/compile/hs32/modules/usr/src/sys/modules/sound/driver/driver/@/powerpc/ofw/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/sound/driver/driver/@/powerpc/ofw/ofwcall32.S |
/*- * Copyright (C) 2009-2011 Nathan Whitehorn * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD: release/9.1.0/sys/powerpc/ofw/ofwcall32.S 223485 2011-06-23 22:21:28Z nwhitehorn $ */ #include <sys/syscall.h> #include <machine/trap.h> #include <machine/param.h> #include <machine/spr.h> #include <machine/asm.h> #define OFWSTKSZ 4096 /* 4K Open Firmware stack */ /* * Globals */ .data GLOBAL(ofmsr) .long 0, 0, 0, 0, 0 /* msr/sprg0-3 used in Open Firmware */ GLOBAL(rtasmsr) .long 0 GLOBAL(openfirmware_entry) .long 0 /* Open Firmware entry point */ GLOBAL(rtas_entry) .long 0 /* RTAS entry point */ .align 4 ofwstk: .space OFWSTKSZ rtas_regsave: .space 4 /* * Open Firmware Entry Point. May need to enter real mode. * * C prototype: int ofwcall(void *callbuffer); */ ASENTRY(ofwcall) mflr %r0 stw %r0,4(%r1) /* Record the old MSR */ mfmsr %r6 /* read client interface handler */ lis %r4,openfirmware_entry@ha lwz %r4,openfirmware_entry@l(%r4) /* * Set the MSR to the OF value. This has the side effect of disabling * exceptions, which prevents preemption later. */ lis %r5,ofmsr@ha lwz %r5,ofmsr@l(%r5) mtmsr %r5 isync /* * Set up OF stack. This needs to be potentially accessible in real mode * The pointer to the current kernel stack is placed at the very * top of the stack along with the old MSR so we can get them back * later. */ mr %r5,%r1 lis %r1,(ofwstk+OFWSTKSZ-32)@ha addi %r1,%r1,(ofwstk+OFWSTKSZ-32)@l stw %r5,20(%r1) /* Save real stack pointer */ stw %r2,24(%r1) /* Save curthread */ stw %r6,28(%r1) /* Save old MSR */ li %r5,0 stw %r5,4(%r1) stw %r5,0(%r1) /* Finally, branch to OF */ mtctr %r4 bctrl /* Reload stack pointer and MSR from the OFW stack */ lwz %r6,28(%r1) lwz %r2,24(%r1) lwz %r1,20(%r1) /* Now set the real MSR */ mtmsr %r6 isync /* Return */ lwz %r0,4(%r1) mtlr %r0 blr /* * RTAS Entry Point. Similar to the OF one, but simpler (no separate stack) * * C prototype: int rtascall(void *callbuffer, void *rtas_privdat); */ ASENTRY(rtascall) mflr %r0 stw %r0,4(%r1) /* Record the old MSR to real-mode-accessible area */ mfmsr %r0 lis %r5,rtas_regsave@ha stw %r0,rtas_regsave@l(%r5) /* read client interface handler */ lis %r5,rtas_entry@ha lwz %r5,rtas_entry@l(%r5) /* Set the MSR to the RTAS value */ lis %r6,rtasmsr@ha lwz %r6,rtasmsr@l(%r6) mtmsr %r6 isync /* Branch to RTAS */ mtctr %r5 bctrl /* Now set the MSR back */ lis %r6,rtas_regsave@ha lwz %r6,rtas_regsave@l(%r6) mtmsr %r6 isync /* And return */ lwz %r0,4(%r1) mtlr %r0 blr