From: Geoff Levand <geoffrey.levand@am•sony.com>
To: linuxppc-dev@ozlabs•org
Subject: [RFC 3/3] zImage: Exception vector support
Date: Sat, 17 Feb 2007 17:17:08 -0800 [thread overview]
Message-ID: <45D7A914.4040000@am.sony.com> (raw)
Add SMP exception vector support to the powerpc zImage bootwrapper. For
platforms which have entry points in the vector table. This implements
SMP entry via the system reset vector.
Signed-off-by: Geoff Levand <geoffrey.levand@am•sony.com>
---
arch/powerpc/boot/head.S | 96 +++++++++++++++++++++++++++++++++++++++++
arch/powerpc/boot/zImage.lds.S | 2
2 files changed, 98 insertions(+)
--- /dev/null
+++ ps3-linux-dev/arch/powerpc/boot/head.S
@@ -0,0 +1,96 @@
+/*
+ * zImage exception vector entry.
+ *
+ * Copyright (C) 2007 Sony Computer Entertainment Inc.
+ * Copyright 2007 Sony Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "ppc_asm.h"
+
+/*
+ * __system_reset_entry - For platforms entering at the reset vector.
+ *
+ * __system_reset_entry runs the bootwrapper code on cpu 0 to prepare the
+ * wrapped kernel image. Cpu 0 then enters the kernel at the end of the
+ * bootwrapper code. .secondary_start sends secondary cpus to
+ * smp_secondary_hold() to wait until the bootwrapper code is finished
+ * running. When signled, secondary cpus enter the kernel directly from
+ * smp_secondary_hold().
+ *
+ * This implementation supports only one secondary cpu.
+ *
+ * For the PS3 first stage entry the MMU is off and the bootwrapper image
+ * has been loaded to lpar address zero. The bootwrapper is entered at
+ * 0x100 (system reset) by both proceesor threads.
+ */
+
+ .section .vectors,"ax"
+ . = 0x100
+ .globl __system_reset_entry
+__system_reset_entry:
+
+ /* switch to 32-bit mode */
+
+ mfmsr r9
+ clrldi r9,r9,1
+ mtmsrd r9
+ nop
+
+ /* test thread number and branch */
+
+ mfspr r3, 0x88
+ cntlzw. r3, r3
+ beq __primary_start
+
+__secondary_start:
+
+ /* setup secondary's stack */
+
+ lis r1, __wrapper_stack_1@ha
+ addi r1, r1, __wrapper_stack_1@l
+ subi r1, r1, 16
+
+ xor r4, r4, r4
+ xor r5, r5, r5
+ b smp_secondary_hold
+
+__primary_start:
+
+ /* setup primary's stack */
+
+ lis r1, __wrapper_stack_0@ha
+ addi r1, r1, __wrapper_stack_0@l
+ subi r1, r1, 16
+
+ xor r3, r3, r3
+ xor r4, r4, r4
+ xor r5, r5, r5
+ b _zimage_start
+
+ .section .bss
+ .align 16;
+ . = . + 4096
+__wrapper_stack_0:
+
+/*
+ * The bss is cleared in crt0, so put a tiny stack in the data
+ * section for the secondary cpu.
+ */
+
+ .section .data
+ .align 16;
+ . = . + 128
+__wrapper_stack_1:
--- ps3-linux-dev.orig/arch/powerpc/boot/zImage.lds.S
+++ ps3-linux-dev/arch/powerpc/boot/zImage.lds.S
@@ -2,6 +2,8 @@ OUTPUT_ARCH(powerpc:common)
ENTRY(_zimage_start)
SECTIONS
{
+ .vectors 0 : { *(.vectors) }
+
. = (4*1024*1024);
_start = .;
.text :
next reply other threads:[~2007-02-18 1:17 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-18 1:17 Geoff Levand [this message]
2007-02-18 1:40 ` [RFC 3/3] zImage: Exception vector support Josh Boyer
2007-02-19 15:03 ` Geoff Levand
2007-02-19 19:55 ` Benjamin Herrenschmidt
2007-02-19 20:40 ` Geoff Levand
2007-02-19 20:51 ` Benjamin Herrenschmidt
2007-02-19 21:35 ` Josh Boyer
2007-02-19 21:39 ` Geoff Levand
2007-02-19 21:51 ` Josh Boyer
2007-02-19 0:34 ` Paul Mackerras
2007-02-20 2:25 ` David Gibson
2007-02-20 14:23 ` Geoff Levand
2007-02-20 15:44 ` Geoff Levand
2007-02-20 16:02 ` Segher Boessenkool
2007-02-21 0:16 ` David Gibson
2007-02-23 17:06 ` Benjamin Herrenschmidt
2007-02-23 17:52 ` Segher Boessenkool
2007-02-21 0:16 ` David Gibson
2007-02-23 17:06 ` Benjamin Herrenschmidt
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