# HG changeset patch
# User Hollis Blanchard <[EMAIL PROTECTED]>
# Node ID f12c1e6a7ede1c34bee9176ade23b1a32617baba
# Parent  116c58e44bbbd20a69c642ca7dad508eb5fef546
[powerpc] implement per-cpu data areas, based on x86 code
Signed-off-by: Hollis Blanchard <[EMAIL PROTECTED]>
---
 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;    */
+SECTIONS
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+  __setup_end = .;
+  __initcall_start = .;
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+  .inithcall.text : { *(.inithcall.text) }
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+  __per_cpu_start = .;
+  .data.percpu : { *(.data.percpu) } :text
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+  . = __per_cpu_start + (NR_CPUS << PERCPU_SHIFT);
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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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-    KEEP (*(EXCLUDE_FILE (*crtend*.o ) .ctors))
-    KEEP (*(SORT(.ctors.*)))
-    KEEP (*(.ctors))
-  }
-  .dtors          :
-  {
-    KEEP (*crtbegin*.o(.dtors))
-    KEEP (*(EXCLUDE_FILE (*crtend*.o ) .dtors))
-    KEEP (*(SORT(.dtors.*)))
-    KEEP (*(.dtors))
-  }
-  .jcr            : { KEEP (*(.jcr)) }
-  .got         ALIGN(8) : { *(.got .toc) }
-  /* We want the small data sections together, so single-instruction offsets
-     can access them all, and initialized data all before uninitialized, so
-     we can shorten the on-disk segment size.  */
-  .sdata          :
-  {
-    *(.sdata .sdata.* .gnu.linkonce.s.*)
-  }
-  _edata = .;
-  PROVIDE (edata = .);
-  __bss_start = .;
-  .tocbss       ALIGN(8) : { *(.tocbss)}
-  .sbss           :
-  {
-    PROVIDE (__sbss_start = .);
-    PROVIDE (___sbss_start = .);
-    *(.dynsbss)
-    *(.sbss .sbss.* .gnu.linkonce.sb.*)
-    *(.scommon)
-    PROVIDE (__sbss_end = .);
-    PROVIDE (___sbss_end = .);
-  }
-  .plt            : { *(.plt) }
-  .bss            :
-  {
-   *(.dynbss)
-   *(.bss .bss.* .gnu.linkonce.b.*)
-   *(COMMON)
-   /* Align here to ensure that the .bss section occupies space up to
-      _end.  Align after .bss to ensure correct alignment even if the
-      .bss section disappears because there are no input sections.  */
-   . = ALIGN(64 / 8);
-  }
-  . = ALIGN(64 / 8);
-  _end = .;
-  PROVIDE (end = .);
-  . = DATA_SEGMENT_END (.);
-  /* Stabs debugging sections.  */
-  .stab          0 : { *(.stab) }
-  .stabstr       0 : { *(.stabstr) }
-  .stab.excl     0 : { *(.stab.excl) }
-  .stab.exclstr  0 : { *(.stab.exclstr) }
-  .stab.index    0 : { *(.stab.index) }
-  .stab.indexstr 0 : { *(.stab.indexstr) }
-  .comment       0 : { *(.comment) }
-  /* 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 */
-  .debug_aranges  0 : { *(.debug_aranges) }
-  .debug_pubnames 0 : { *(.debug_pubnames) }
-  /* DWARF 2 */
-  .debug_info     0 : { *(.debug_info .gnu.linkonce.wi.*) }
-  .debug_abbrev   0 : { *(.debug_abbrev) }
-  .debug_line     0 : { *(.debug_line) }
-  .debug_frame    0 : { *(.debug_frame) }
-  .debug_str      0 : { *(.debug_str) }
-  .debug_loc      0 : { *(.debug_loc) }
-  .debug_macinfo  0 : { *(.debug_macinfo) }
-  /* SGI/MIPS DWARF 2 extensions */
-  .debug_weaknames 0 : { *(.debug_weaknames) }
-  .debug_funcnames 0 : { *(.debug_funcnames) }
-  .debug_typenames 0 : { *(.debug_typenames) }
-  .debug_varnames  0 : { *(.debug_varnames) }
-  /DISCARD/ : { *(.note.GNU-stack) }
-}

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