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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Simplify pagetable initialisation. Since swapper_pg_dir now
# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 74044b8186a9b66eeeb684915e741c0ed9ed0e8b
# Parent 1a0723cd37f1a7e2fb24021699d9df3625183dc0
Simplify pagetable initialisation. Since swapper_pg_dir now
is the one allocated by the domain builder, we can be sure
it is below 4GB (essential for PAE).
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
diff -r 1a0723cd37f1 -r 74044b8186a9
linux-2.6-xen-sparse/arch/xen/i386/kernel/Makefile
--- a/linux-2.6-xen-sparse/arch/xen/i386/kernel/Makefile Fri Aug 19
16:06:43 2005
+++ b/linux-2.6-xen-sparse/arch/xen/i386/kernel/Makefile Fri Aug 19
16:46:51 2005
@@ -14,8 +14,7 @@
c-obj-y := semaphore.o vm86.o \
ptrace.o sys_i386.o \
- i387.o dmi_scan.o bootflag.o \
- doublefault.o
+ i387.o dmi_scan.o bootflag.o
s-obj-y :=
obj-y += cpu/
@@ -85,7 +84,7 @@
$(obj)/vsyscall-sysenter.o FORCE
$(call if_changed,syscall)
-c-link := init_task.o
+c-link :=
s-link := vsyscall-int80.o vsyscall-sysenter.o vsyscall-sigreturn.o
vsyscall.lds.o syscall_table.o
$(patsubst %.o,$(obj)/%.c,$(c-obj-y) $(c-obj-m) $(c-link)) $(patsubst
%.o,$(obj)/%.S,$(s-obj-y) $(s-link)):
diff -r 1a0723cd37f1 -r 74044b8186a9
linux-2.6-xen-sparse/arch/xen/i386/kernel/head.S
--- a/linux-2.6-xen-sparse/arch/xen/i386/kernel/head.S Fri Aug 19 16:06:43 2005
+++ b/linux-2.6-xen-sparse/arch/xen/i386/kernel/head.S Fri Aug 19 16:46:51 2005
@@ -136,9 +136,6 @@
ENTRY(empty_zero_page)
.org 0x2000
-ENTRY(swapper_pg_dir)
-
-.org 0x3000
ENTRY(cpu_gdt_table)
.quad 0x0000000000000000 /* NULL descriptor */
.quad 0x0000000000000000 /* 0x0b reserved */
@@ -190,10 +187,10 @@
.quad 0x0000000000000000 /* 0xf8 - GDT entry 31: double-fault
TSS */
.fill GDT_ENTRIES-32,8,0
-.org 0x4000
+.org 0x3000
ENTRY(default_ldt)
-.org 0x5000
+.org 0x4000
/*
* Real beginning of normal "text" segment
*/
diff -r 1a0723cd37f1 -r 74044b8186a9
linux-2.6-xen-sparse/arch/xen/i386/mm/init.c
--- a/linux-2.6-xen-sparse/arch/xen/i386/mm/init.c Fri Aug 19 16:06:43 2005
+++ b/linux-2.6-xen-sparse/arch/xen/i386/mm/init.c Fri Aug 19 16:46:51 2005
@@ -342,11 +342,15 @@
extern void __init remap_numa_kva(void);
#endif
+pgd_t *swapper_pg_dir;
+
static void __init pagetable_init (void)
{
unsigned long vaddr;
- pgd_t *pgd_base = swapper_pg_dir;
- pgd_t *old_pgd = (pgd_t *)xen_start_info.pt_base;
+ pgd_t *pgd_base = (pgd_t *)xen_start_info.pt_base;
+
+ swapper_pg_dir = pgd_base;
+ init_mm.pgd = pgd_base;
#ifdef CONFIG_X86_PAE
int i;
@@ -366,44 +370,6 @@
__PAGE_KERNEL |= _PAGE_GLOBAL;
__PAGE_KERNEL_EXEC |= _PAGE_GLOBAL;
}
-
- /*
- * Switch to proper mm_init page directory. Initialise from the current
- * page directory, write-protect the new page directory, then switch to
- * it. We clean up by write-enabling and then freeing the old page dir.
- */
-#ifndef CONFIG_X86_PAE
- memcpy(pgd_base, old_pgd, PTRS_PER_PGD_NO_HV*sizeof(pgd_t));
- make_page_readonly(pgd_base);
- xen_pgd_pin(__pa(pgd_base));
- load_cr3(pgd_base);
- xen_pgd_unpin(__pa(old_pgd));
- make_page_writable(old_pgd);
- __flush_tlb_all();
- free_bootmem(__pa(old_pgd), PAGE_SIZE);
-#else
- {
- pud_t *old_pud = pud_offset(old_pgd+3, PAGE_OFFSET);
- pmd_t *old_pmd = pmd_offset(old_pud, PAGE_OFFSET);
- pmd_t *new_pmd = alloc_bootmem_low_pages(PAGE_SIZE);
-
- memcpy(new_pmd, old_pmd, PAGE_SIZE);
- memcpy(pgd_base, old_pgd, PTRS_PER_PGD_NO_HV*sizeof(pgd_t));
- set_pgd(&pgd_base[3], __pgd(__pa(new_pmd) | _PAGE_PRESENT));
-
- make_page_readonly(new_pmd);
- make_page_readonly(pgd_base);
- xen_pgd_pin(__pa(pgd_base));
- load_cr3(pgd_base);
- xen_pgd_unpin(__pa(old_pgd));
- make_page_writable(old_pgd);
- make_page_writable(old_pmd);
- __flush_tlb_all();
-
- free_bootmem(__pa(old_pgd), PAGE_SIZE);
- free_bootmem(__pa(old_pmd), PAGE_SIZE);
- }
-#endif
init_mm.context.pinned = 1;
kernel_physical_mapping_init(pgd_base);
diff -r 1a0723cd37f1 -r 74044b8186a9
linux-2.6-xen-sparse/include/asm-xen/asm-i386/pgtable.h
--- a/linux-2.6-xen-sparse/include/asm-xen/asm-i386/pgtable.h Fri Aug 19
16:06:43 2005
+++ b/linux-2.6-xen-sparse/include/asm-xen/asm-i386/pgtable.h Fri Aug 19
16:46:51 2005
@@ -32,7 +32,7 @@
*/
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
extern unsigned long empty_zero_page[1024];
-extern pgd_t swapper_pg_dir[1024];
+extern pgd_t *swapper_pg_dir;
extern kmem_cache_t *pgd_cache;
extern kmem_cache_t *pmd_cache;
extern spinlock_t pgd_lock;
diff -r 1a0723cd37f1 -r 74044b8186a9
linux-2.6-xen-sparse/arch/xen/i386/kernel/init_task.c
--- /dev/null Fri Aug 19 16:06:43 2005
+++ b/linux-2.6-xen-sparse/arch/xen/i386/kernel/init_task.c Fri Aug 19
16:46:51 2005
@@ -0,0 +1,49 @@
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/init_task.h>
+#include <linux/fs.h>
+#include <linux/mqueue.h>
+
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/desc.h>
+
+static struct fs_struct init_fs = INIT_FS;
+static struct files_struct init_files = INIT_FILES;
+static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
+static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
+
+#define swapper_pg_dir ((pgd_t *)NULL)
+struct mm_struct init_mm = INIT_MM(init_mm);
+#undef swapper_pg_dir
+
+EXPORT_SYMBOL(init_mm);
+
+/*
+ * Initial thread structure.
+ *
+ * We need to make sure that this is THREAD_SIZE aligned due to the
+ * way process stacks are handled. This is done by having a special
+ * "init_task" linker map entry..
+ */
+union thread_union init_thread_union
+ __attribute__((__section__(".data.init_task"))) =
+ { INIT_THREAD_INFO(init_task) };
+
+/*
+ * Initial task structure.
+ *
+ * All other task structs will be allocated on slabs in fork.c
+ */
+struct task_struct init_task = INIT_TASK(init_task);
+
+EXPORT_SYMBOL(init_task);
+
+/*
+ * per-CPU TSS segments. Threads are completely 'soft' on Linux,
+ * no more per-task TSS's.
+ */
+DEFINE_PER_CPU(struct tss_struct, init_tss) ____cacheline_maxaligned_in_smp =
INIT_TSS;
+
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