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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Eliminate hard coded items from x86_64 __xen_guest section
# HG changeset patch
# User cl349@xxxxxxxxxxxxxxxxxxxx
# Node ID 012e133941fc08c1e7078ee3d49d6b0833e96d34
# Parent c93c6b392ce54e1f6e6b95529a90741b6b8b41e1
Eliminate hard coded items from x86_64 __xen_guest section
to avoid problems when the position of the hypercall page changes.
Further, clean up many things to avoid needless differences to native
code, while also adding a couple of adjustments that only will be
submitted for native code inclusion, that simplify code, or that
remove unused elements.
From: Jan Beulich <JBeulich@xxxxxxxxxx>
Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>
diff -r c93c6b392ce5 -r 012e133941fc
linux-2.6-xen-sparse/arch/x86_64/kernel/head-xen.S
--- a/linux-2.6-xen-sparse/arch/x86_64/kernel/head-xen.S Mon Feb 20
16:08:27 2006
+++ b/linux-2.6-xen-sparse/arch/x86_64/kernel/head-xen.S Mon Feb 20
16:42:54 2006
@@ -14,15 +14,6 @@
#include <linux/linkage.h>
-
-.section __xen_guest
- .ascii "GUEST_OS=linux,GUEST_VER=2.6"
- .ascii ",XEN_VER=xen-3.0"
- .ascii ",VIRT_BASE=0xffffffff80000000"
- .ascii ",HYPERCALL_PAGE=0x10a" /* __pa(hypercall_page) >> 12 */
- .ascii ",LOADER=generic"
- .byte 0
-
#include <linux/threads.h>
#include <linux/init.h>
#include <asm/desc.h>
@@ -30,64 +21,21 @@
#include <asm/page.h>
#include <asm/msr.h>
#include <asm/cache.h>
-
-/* we are not able to switch in one step to the final KERNEL ADRESS SPACE
- * because we need identity-mapped pages on setup so define __START_KERNEL to
- * 0x100000 for this stage
- *
- */
.text
.code64
.globl startup_64
startup_64:
ENTRY(_start)
- movq %rsi,xen_start_info(%rip)
-
-#ifdef CONFIG_SMP
-ENTRY(startup_64_smp)
-#endif /* CONFIG_SMP */
-
- cld
-
- movq init_rsp(%rip),%rsp
+ movq $(init_thread_union+THREAD_SIZE-8),%rsp
/* zero EFLAGS after setting rsp */
pushq $0
popfq
- movq initial_code(%rip),%rax
- jmp *%rax
- /* SMP bootup changes these two */
- .globl initial_code
-initial_code:
- .quad x86_64_start_kernel
- .globl init_rsp
-init_rsp:
- .quad init_thread_union+THREAD_SIZE-8
-
-ENTRY(early_idt_handler)
- xorl %eax,%eax
- movq 8(%rsp),%rsi # get rip
- movq (%rsp),%rdx
- leaq early_idt_msg(%rip),%rdi
-1: hlt # generate #GP
- jmp 1b
-
-early_idt_msg:
- .asciz "PANIC: early exception rip %lx error %lx cr2 %lx\n"
-
-#if 0
-ENTRY(lgdt_finish)
- movl $(__USER_DS),%eax # DS/ES contains default USER segment
- movw %ax,%ds
- movw %ax,%es
- movl $(__KERNEL_DS),%eax
- movw %ax,%ss # after changing gdt.
- popq %rax # get the retrun address
- pushq $(__KERNEL_CS)
- pushq %rax
- lretq
-#endif
+ /* rsi is pointer to startup info structure.
+ pass it to C */
+ movq %rsi,%rdi
+ jmp x86_64_start_kernel
ENTRY(stext)
ENTRY(_stext)
@@ -113,39 +61,9 @@
NEXT_PAGE(init_level4_user_pgt)
.fill 512,8,0
- /*
- * In Xen the following pre-initialized pgt entries are re-initialized.
- */
NEXT_PAGE(level3_kernel_pgt)
- .fill 510,8,0
- /* (2^48-(2*1024*1024*1024)-((2^39)*511))/(2^30) = 510 */
- .quad phys_level2_kernel_pgt | 0x007
- .fill 1,8,0
+ .fill 512,8,0
-NEXT_PAGE(level2_ident_pgt)
- /* 40MB for bootup. */
- i = 0
- .rept 20
- .quad i << 21 | 0x083
- i = i + 1
- .endr
- /* Temporary mappings for the super early allocator in
arch/x86_64/mm/init.c */
- .globl temp_boot_pmds
-temp_boot_pmds:
- .fill 492,8,0
-
-NEXT_PAGE(level2_kernel_pgt)
- /* 40MB kernel mapping. The kernel code cannot be bigger than that.
- When you change this change KERNEL_TEXT_SIZE in page.h too. */
- /* (2^48-(2*1024*1024*1024)-((2^39)*511)-((2^30)*510)) = 0 */
- i = 0
- .rept 20
- .quad i << 21 | 0x183
- i = i + 1
- .endr
- /* Module mapping starts here */
- .fill 492,8,0
-
/*
* This is used for vsyscall area mapping as we have a different
* level4 page table for user.
@@ -153,78 +71,16 @@
NEXT_PAGE(level3_user_pgt)
.fill 512,8,0
-NEXT_PAGE(cpu_gdt_table)
-/* The TLS descriptors are currently at a different place compared to i386.
- Hopefully nobody expects them at a fixed place (Wine?) */
- .quad 0x0000000000000000 /* NULL descriptor */
- .quad 0x0 /* unused */
- .quad 0x00affa000000ffff /* __KERNEL_CS */
- .quad 0x00cff2000000ffff /* __KERNEL_DS */
- .quad 0x00cffa000000ffff /* __USER32_CS */
- .quad 0x00cff2000000ffff /* __USER_DS, __USER32_DS */
- .quad 0x00affa000000ffff /* __USER_CS */
- .quad 0x00cffa000000ffff /* __KERNEL32_CS */
- .quad 0,0 /* TSS */
- .quad 0,0 /* LDT */
- .quad 0,0,0 /* three TLS descriptors */
- .quad 0 /* unused */
-gdt_end:
-#if 0
- /* asm/segment.h:GDT_ENTRIES must match this */
- /* This should be a multiple of the cache line size */
- /* GDTs of other CPUs are now dynamically allocated */
-
- /* zero the remaining page */
- .fill PAGE_SIZE / 8 - GDT_ENTRIES,8,0
-#endif
+NEXT_PAGE(level2_kernel_pgt)
+ .fill 512,8,0
NEXT_PAGE(empty_zero_page)
-
-NEXT_PAGE(level3_physmem_pgt)
- .quad phys_level2_kernel_pgt | 0x007 /* so that __va works even
before pagetable_init */
+ .skip PAGE_SIZE
NEXT_PAGE(hypercall_page)
-.if (phys_hypercall_page - 0x10a000)
- /* cause compiler error if the hypercall_page is at a
- * different address than expected. */
- .quad __adjust_hypercall_page_in_header
-.endif
.fill 512,8,0
#undef NEXT_PAGE
-
- .data
-
-#ifndef CONFIG_XEN
-#ifdef CONFIG_ACPI_SLEEP
- .align PAGE_SIZE
-ENTRY(wakeup_level4_pgt)
- .quad phys_level3_ident_pgt | 0x007
- .fill 255,8,0
- .quad phys_level3_physmem_pgt | 0x007
- .fill 254,8,0
- /* (2^48-(2*1024*1024*1024))/(2^39) = 511 */
- .quad phys_level3_kernel_pgt | 0x007
-#endif
-
-#ifndef CONFIG_HOTPLUG_CPU
- __INITDATA
-#endif
- /*
- * This default setting generates an ident mapping at address 0x100000
- * and a mapping for the kernel that precisely maps virtual address
- * 0xffffffff80000000 to physical address 0x000000. (always using
- * 2Mbyte large pages provided by PAE mode)
- */
- .align PAGE_SIZE
-ENTRY(boot_level4_pgt)
- .quad phys_level3_ident_pgt | 0x007
- .fill 255,8,0
- .quad phys_level3_physmem_pgt | 0x007
- .fill 254,8,0
- /* (2^48-(2*1024*1024*1024))/(2^39) = 511 */
- .quad phys_level3_kernel_pgt | 0x007
-#endif
.data
@@ -246,11 +102,59 @@
* Also sysret mandates a special GDT layout
*/
-.align PAGE_SIZE
+ .section .data.page_aligned, "aw"
+ .align PAGE_SIZE
+/* The TLS descriptors are currently at a different place compared to i386.
+ Hopefully nobody expects them at a fixed place (Wine?) */
+
+ENTRY(cpu_gdt_table)
+ .quad 0x0000000000000000 /* NULL descriptor */
+ .quad 0x0 /* unused */
+ .quad 0x00affa000000ffff /* __KERNEL_CS */
+ .quad 0x00cff2000000ffff /* __KERNEL_DS */
+ .quad 0x00cffa000000ffff /* __USER32_CS */
+ .quad 0x00cff2000000ffff /* __USER_DS, __USER32_DS */
+ .quad 0x00affa000000ffff /* __USER_CS */
+ .quad 0x00cffa000000ffff /* __KERNEL32_CS */
+ .quad 0,0 /* TSS */
+ .quad 0,0 /* LDT */
+ .quad 0,0,0 /* three TLS descriptors */
+ .quad 0 /* unused */
+gdt_end:
+ /* asm/segment.h:GDT_ENTRIES must match this */
+ /* This should be a multiple of the cache line size */
+ /* GDTs of other CPUs are now dynamically allocated */
+
+ /* zero the remaining page */
+ .fill PAGE_SIZE / 8 - GDT_ENTRIES,8,0
+
+ .section .bss, "aw", @nobits
+ .align L1_CACHE_BYTES
ENTRY(idt_table)
.rept 256
.quad 0
.quad 0
.endr
+/*
+ * __xen_guest information
+ */
+.macro utoh value
+ .if (\value) < 0 || (\value) >= 0x10
+ utoh (((\value)>>4)&0x0fffffffffffffff)
+ .endif
+ .if ((\value) & 0xf) < 10
+ .byte '0' + ((\value) & 0xf)
+ .else
+ .byte 'A' + ((\value) & 0xf) - 10
+ .endif
+.endm
+
+.section __xen_guest
+ .ascii "GUEST_OS=linux,GUEST_VER=2.6"
+ .ascii ",XEN_VER=xen-3.0"
+ .ascii ",VIRT_BASE=0x"; utoh __START_KERNEL_map
+ .ascii ",HYPERCALL_PAGE=0x"; utoh (phys_hypercall_page >> PAGE_SHIFT)
+ .ascii ",LOADER=generic"
+ .byte 0
diff -r c93c6b392ce5 -r 012e133941fc
linux-2.6-xen-sparse/arch/x86_64/kernel/head64-xen.c
--- a/linux-2.6-xen-sparse/arch/x86_64/kernel/head64-xen.c Mon Feb 20
16:08:27 2006
+++ b/linux-2.6-xen-sparse/arch/x86_64/kernel/head64-xen.c Mon Feb 20
16:42:54 2006
@@ -47,7 +47,7 @@
static void __init copy_bootdata(char *real_mode_data)
{
-#if 0
+#ifndef CONFIG_XEN
int new_data;
char * command_line;
@@ -63,7 +63,6 @@
}
command_line = (char *) ((u64)(new_data));
memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
- printk("Bootdata ok (command line is %s)\n", saved_command_line);
#else
int max_cmdline;
@@ -71,8 +70,8 @@
max_cmdline = COMMAND_LINE_SIZE;
memcpy(saved_command_line, xen_start_info->cmd_line, max_cmdline);
saved_command_line[max_cmdline-1] = '\0';
+#endif
printk("Bootdata ok (command line is %s)\n", saved_command_line);
-#endif
}
static void __init setup_boot_cpu_data(void)
@@ -98,6 +97,7 @@
char *s;
int i;
+ xen_start_info = (struct start_info *)real_mode_data;
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
phys_to_machine_mapping =
(unsigned long *)xen_start_info->mfn_list;
@@ -105,9 +105,9 @@
xen_start_info->nr_pt_frames;
}
+#if 0
for (i = 0; i < 256; i++)
set_intr_gate(i, early_idt_handler);
-#if 0
asm volatile("lidt %0" :: "m" (idt_descr));
#endif
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