# HG changeset patch
# User Hollis Blanchard <hollisb@xxxxxxxxxx>
# Node ID f12c1e6a7ede1c34bee9176ade23b1a32617baba
# Parent 116c58e44bbbd20a69c642ca7dad508eb5fef546
[powerpc] implement per-cpu data areas, based on x86 code
Signed-off-by: Hollis Blanchard <hollisb@xxxxxxxxxx>
---
xen/arch/powerpc/xen.lds | 226 ------------------------------------
xen/arch/powerpc/Makefile | 3
xen/arch/powerpc/setup.c | 36 +++++
xen/arch/powerpc/xen.lds.S | 239 +++++++++++++++++++++++++++++++++++++++
xen/include/asm-powerpc/percpu.h | 22 +++
5 files changed, 300 insertions(+), 226 deletions(-)
diff -r 116c58e44bbb -r f12c1e6a7ede xen/arch/powerpc/Makefile
--- a/xen/arch/powerpc/Makefile Thu Jul 27 17:23:42 2006 -0500
+++ b/xen/arch/powerpc/Makefile Thu Jul 27 17:44:14 2006 -0500
@@ -109,6 +109,9 @@ asm-offsets.s: $(TARGET_SUBARCH)/asm-off
asm-offsets.s: $(TARGET_SUBARCH)/asm-offsets.c $(HDRS)
$(CC) $(CFLAGS) -S -o $@ $<
+xen.lds: xen.lds.S $(HDRS)
+ $(CC) $(CFLAGS) -P -E $(AFLAGS) -o $@ $<
+
dom0.bin: $(DOM0_IMAGE)
cp $< $@
diff -r 116c58e44bbb -r f12c1e6a7ede xen/arch/powerpc/setup.c
--- a/xen/arch/powerpc/setup.c Thu Jul 27 17:23:42 2006 -0500
+++ b/xen/arch/powerpc/setup.c Thu Jul 27 17:44:14 2006 -0500
@@ -40,6 +40,7 @@
#include <asm/cache.h>
#include <asm/debugger.h>
#include <asm/delay.h>
+#include <asm/percpu.h>
#include "exceptions.h"
#include "of-devtree.h"
@@ -68,6 +69,7 @@ ulong isa_io_base;
ulong isa_io_base;
struct ns16550_defaults ns16550;
+extern char __per_cpu_start[], __per_cpu_data_end[], __per_cpu_end[];
extern void idle_loop(void);
/* move us to a header file */
@@ -117,6 +119,36 @@ static void hw_probe_attn(unsigned char
asm volatile(".long 0x00000200; nop");
}
+static void percpu_init_areas(void)
+{
+ unsigned int i, data_size = __per_cpu_data_end - __per_cpu_start;
+
+ BUG_ON(data_size > PERCPU_SIZE);
+
+ for ( i = 1; i < NR_CPUS; i++ )
+ memcpy(__per_cpu_start + (i << PERCPU_SHIFT),
+ __per_cpu_start,
+ data_size);
+}
+
+static void percpu_free_unused_areas(void)
+{
+ unsigned int i, first_unused;
+
+ /* Find first unused CPU number. */
+ for ( i = 0; i < NR_CPUS; i++ )
+ if ( !cpu_online(i) )
+ break;
+ first_unused = i;
+
+ /* Check that there are no holes in cpu_online_map. */
+ for ( ; i < NR_CPUS; i++ )
+ BUG_ON(cpu_online(i));
+
+ init_xenheap_pages((ulong)__per_cpu_start + (first_unused << PERCPU_SHIFT),
+ (ulong)__per_cpu_end);
+}
+
static void __init start_of_day(void)
{
struct domain *idle_domain;
@@ -134,6 +166,8 @@ static void __init start_of_day(void)
/* for some reason we need to set our own bit in the thread map */
cpu_set(0, cpu_sibling_map[0]);
+
+ percpu_free_unused_areas();
initialize_keytable();
/* Register another key that will allow for the the Harware Probe
@@ -264,6 +298,8 @@ static void __init __start_xen(multiboot
/* make sure the OF devtree is good */
ofd_walk((void *)oftree, OFD_ROOT, ofd_dump_props, OFD_DUMP_ALL);
#endif
+
+ percpu_init_areas();
/* mark all memory from modules onward as unused */
init_boot_pages(freemem, eomem);
diff -r 116c58e44bbb -r f12c1e6a7ede xen/arch/powerpc/xen.lds.S
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/arch/powerpc/xen.lds.S Thu Jul 27 17:44:14 2006 -0500
@@ -0,0 +1,239 @@
+#include <asm/config.h>
+#include <asm/page.h>
+#include <asm/percpu.h>
+
+/* Script for -z combreloc: combine and sort reloc sections */
+OUTPUT_FORMAT("elf64-powerpc", "elf64-powerpc",
+ "elf64-powerpc")
+OUTPUT_ARCH(powerpc:common64)
+ENTRY(_start)
+SEARCH_DIR("=/usr/local/lib64"); SEARCH_DIR("=/lib64");
SEARCH_DIR("=/usr/lib64"); SEARCH_DIR("=/usr/local/lib"); SEARCH_DIR("=/lib");
SEARCH_DIR("=/usr/lib");
+/* Do we need any of these for elf?
+ __DYNAMIC = 0; */
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+ /* Ensure the __preinit_array_start label is properly aligned. We
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+ .data :
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+
+ /* Xen addition */
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+ __setup_end = .;
+ __initcall_start = .;
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+ __initcall_end = .;
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+ .data.percpu : { *(.data.percpu) } :text
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diff -r 116c58e44bbb -r f12c1e6a7ede xen/include/asm-powerpc/percpu.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/include/asm-powerpc/percpu.h Thu Jul 27 17:44:14 2006 -0500
@@ -0,0 +1,22 @@
+/* from xen/include/asm-x86/percpu.h */
+
+#ifndef __PPC_PERCPU_H__
+#define __PPC_PERCPU_H__
+
+#define PERCPU_SHIFT 12
+#define PERCPU_SIZE (1UL << PERCPU_SHIFT)
+
+/* Separate out the type, so (int[3], foo) works. */
+#define DEFINE_PER_CPU(type, name) \
+ __attribute__((__section__(".data.percpu"))) \
+ __typeof__(type) per_cpu__##name
+
+/* var is in discarded region: offset to particular copy we want */
+#define per_cpu(var, cpu) \
+ (*RELOC_HIDE(&per_cpu__##var, ((unsigned int)(cpu))<<PERCPU_SHIFT))
+#define __get_cpu_var(var) \
+ (per_cpu(var, smp_processor_id()))
+
+#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
+
+#endif /* __PPC_PERCPU_H__ */
diff -r 116c58e44bbb -r f12c1e6a7ede xen/arch/powerpc/xen.lds
--- a/xen/arch/powerpc/xen.lds Thu Jul 27 17:23:42 2006 -0500
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,226 +0,0 @@
-/* Script for -z combreloc: combine and sort reloc sections */
-OUTPUT_FORMAT("elf64-powerpc", "elf64-powerpc",
- "elf64-powerpc")
-OUTPUT_ARCH(powerpc:common64)
-ENTRY(_start)
-SEARCH_DIR("=/usr/local/lib64"); SEARCH_DIR("=/lib64");
SEARCH_DIR("=/usr/lib64"); SEARCH_DIR("=/usr/local/lib"); SEARCH_DIR("=/lib");
SEARCH_DIR("=/usr/lib");
-/* Do we need any of these for elf?
- __DYNAMIC = 0; */
-SECTIONS
-{
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- /* DWARF debug sections.
- Symbols in the DWARF debugging sections are relative to the beginning
- of the section so we begin them at 0. */
- /* DWARF 1 */
- .debug 0 : { *(.debug) }
- .line 0 : { *(.line) }
- /* GNU DWARF 1 extensions */
- .debug_srcinfo 0 : { *(.debug_srcinfo) }
- .debug_sfnames 0 : { *(.debug_sfnames) }
- /* DWARF 1.1 and DWARF 2 */
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- .debug_varnames 0 : { *(.debug_varnames) }
- /DISCARD/ : { *(.note.GNU-stack) }
-}
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