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authorStephen Rothwell <sfr@canb.auug.org.au>2007-08-22 13:44:58 +1000
committerPaul Mackerras <paulus@samba.org>2007-08-22 16:48:34 +1000
commitfc68e8699f1f987060ef817cff6a13a7cd7d4c8a (patch)
tree1b5735b9669b177815eb8b2aa469b25318254265 /arch/powerpc/platforms/iseries
parentdc559f7cd5d6d11a99b6c29402b31fbb3f3a1db0 (diff)
[POWERPC] Move iSeries startup code out of head_64.S
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/platforms/iseries')
-rw-r--r--arch/powerpc/platforms/iseries/Makefile1
-rw-r--r--arch/powerpc/platforms/iseries/exception.S114
2 files changed, 115 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/iseries/Makefile b/arch/powerpc/platforms/iseries/Makefile
index 13ac3015d91..60db509638f 100644
--- a/arch/powerpc/platforms/iseries/Makefile
+++ b/arch/powerpc/platforms/iseries/Makefile
@@ -2,6 +2,7 @@ EXTRA_CFLAGS += -mno-minimal-toc
extra-y += dt.o
+obj-y += exception.o
obj-y += hvlog.o hvlpconfig.o lpardata.o setup.o dt_mod.o mf.o lpevents.o \
hvcall.o proc.o htab.o iommu.o misc.o irq.o
obj-$(CONFIG_PCI) += pci.o vpdinfo.o
diff --git a/arch/powerpc/platforms/iseries/exception.S b/arch/powerpc/platforms/iseries/exception.S
new file mode 100644
index 00000000000..b6e2f8c0b09
--- /dev/null
+++ b/arch/powerpc/platforms/iseries/exception.S
@@ -0,0 +1,114 @@
+/*
+ * Low level routines for legacy iSeries support.
+ *
+ * Extracted from head_64.S
+ *
+ * PowerPC version
+ * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ * Rewritten by Cort Dougan (cort@cs.nmt.edu) for PReP
+ * Copyright (C) 1996 Cort Dougan <cort@cs.nmt.edu>
+ * Adapted for Power Macintosh by Paul Mackerras.
+ * Low-level exception handlers and MMU support
+ * rewritten by Paul Mackerras.
+ * Copyright (C) 1996 Paul Mackerras.
+ *
+ * Adapted for 64bit PowerPC by Dave Engebretsen, Peter Bergner, and
+ * Mike Corrigan {engebret|bergner|mikejc}@us.ibm.com
+ *
+ * This file contains the low-level support and setup for the
+ * PowerPC-64 platform, including trap and interrupt dispatch.
+ *
+ * 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; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <asm/reg.h>
+#include <asm/ppc_asm.h>
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+#include <asm/ptrace.h>
+
+ .text
+
+ .globl system_reset_iSeries
+system_reset_iSeries:
+ mfspr r13,SPRN_SPRG3 /* Get paca address */
+ mfmsr r24
+ ori r24,r24,MSR_RI
+ mtmsrd r24 /* RI on */
+ lhz r24,PACAPACAINDEX(r13) /* Get processor # */
+ cmpwi 0,r24,0 /* Are we processor 0? */
+ bne 1f
+ b .__start_initialization_iSeries /* Start up the first processor */
+1: mfspr r4,SPRN_CTRLF
+ li r5,CTRL_RUNLATCH /* Turn off the run light */
+ andc r4,r4,r5
+ mtspr SPRN_CTRLT,r4
+
+1:
+ HMT_LOW
+#ifdef CONFIG_SMP
+ lbz r23,PACAPROCSTART(r13) /* Test if this processor
+ * should start */
+ sync
+ LOAD_REG_IMMEDIATE(r3,current_set)
+ sldi r28,r24,3 /* get current_set[cpu#] */
+ ldx r3,r3,r28
+ addi r1,r3,THREAD_SIZE
+ subi r1,r1,STACK_FRAME_OVERHEAD
+
+ cmpwi 0,r23,0
+ beq iSeries_secondary_smp_loop /* Loop until told to go */
+ b __secondary_start /* Loop until told to go */
+iSeries_secondary_smp_loop:
+ /* Let the Hypervisor know we are alive */
+ /* 8002 is a call to HvCallCfg::getLps, a harmless Hypervisor function */
+ lis r3,0x8002
+ rldicr r3,r3,32,15 /* r0 = (r3 << 32) & 0xffff000000000000 */
+#else /* CONFIG_SMP */
+ /* Yield the processor. This is required for non-SMP kernels
+ which are running on multi-threaded machines. */
+ lis r3,0x8000
+ rldicr r3,r3,32,15 /* r3 = (r3 << 32) & 0xffff000000000000 */
+ addi r3,r3,18 /* r3 = 0x8000000000000012 which is "yield" */
+ li r4,0 /* "yield timed" */
+ li r5,-1 /* "yield forever" */
+#endif /* CONFIG_SMP */
+ li r0,-1 /* r0=-1 indicates a Hypervisor call */
+ sc /* Invoke the hypervisor via a system call */
+ mfspr r13,SPRN_SPRG3 /* Put r13 back ???? */
+ b 1b /* If SMP not configured, secondaries
+ * loop forever */
+
+_INIT_STATIC(__start_initialization_iSeries)
+ /* Clear out the BSS */
+ LOAD_REG_IMMEDIATE(r11,__bss_stop)
+ LOAD_REG_IMMEDIATE(r8,__bss_start)
+ sub r11,r11,r8 /* bss size */
+ addi r11,r11,7 /* round up to an even double word */
+ rldicl. r11,r11,61,3 /* shift right by 3 */
+ beq 4f
+ addi r8,r8,-8
+ li r0,0
+ mtctr r11 /* zero this many doublewords */
+3: stdu r0,8(r8)
+ bdnz 3b
+4:
+ LOAD_REG_IMMEDIATE(r1,init_thread_union)
+ addi r1,r1,THREAD_SIZE
+ li r0,0
+ stdu r0,-STACK_FRAME_OVERHEAD(r1)
+
+ LOAD_REG_IMMEDIATE(r2,__toc_start)
+ addi r2,r2,0x4000
+ addi r2,r2,0x4000
+
+ bl .iSeries_early_setup
+ bl .early_setup
+
+ /* relocation is on at this point */
+
+ b .start_here_common