mirror of
https://github.com/torvalds/linux.git
synced 2024-11-05 03:21:32 +00:00
583323b9d2
commit 3e9704739d ("x86: boot secondary
cpus through initial_code") causes the kernel to crash when a CPU is
brought online after the read only sections have been write
protected. The write to initial_code in do_boot_cpu() fails.
Move inital_code to .cpuinit.data section.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: H. Peter Anvin <hpa@zytor.com>
720 lines
17 KiB
ArmAsm
720 lines
17 KiB
ArmAsm
/*
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*
|
|
* Enhanced CPU detection and feature setting code by Mike Jagdis
|
|
* and Martin Mares, November 1997.
|
|
*/
|
|
|
|
.text
|
|
#include <linux/threads.h>
|
|
#include <linux/init.h>
|
|
#include <linux/linkage.h>
|
|
#include <asm/segment.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/desc.h>
|
|
#include <asm/cache.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/processor-flags.h>
|
|
|
|
/* Physical address */
|
|
#define pa(X) ((X) - __PAGE_OFFSET)
|
|
|
|
/*
|
|
* References to members of the new_cpu_data structure.
|
|
*/
|
|
|
|
#define X86 new_cpu_data+CPUINFO_x86
|
|
#define X86_VENDOR new_cpu_data+CPUINFO_x86_vendor
|
|
#define X86_MODEL new_cpu_data+CPUINFO_x86_model
|
|
#define X86_MASK new_cpu_data+CPUINFO_x86_mask
|
|
#define X86_HARD_MATH new_cpu_data+CPUINFO_hard_math
|
|
#define X86_CPUID new_cpu_data+CPUINFO_cpuid_level
|
|
#define X86_CAPABILITY new_cpu_data+CPUINFO_x86_capability
|
|
#define X86_VENDOR_ID new_cpu_data+CPUINFO_x86_vendor_id
|
|
|
|
/*
|
|
* This is how much memory *in addition to the memory covered up to
|
|
* and including _end* we need mapped initially.
|
|
* We need:
|
|
* - one bit for each possible page, but only in low memory, which means
|
|
* 2^32/4096/8 = 128K worst case (4G/4G split.)
|
|
* - enough space to map all low memory, which means
|
|
* (2^32/4096) / 1024 pages (worst case, non PAE)
|
|
* (2^32/4096) / 512 + 4 pages (worst case for PAE)
|
|
* - a few pages for allocator use before the kernel pagetable has
|
|
* been set up
|
|
*
|
|
* Modulo rounding, each megabyte assigned here requires a kilobyte of
|
|
* memory, which is currently unreclaimed.
|
|
*
|
|
* This should be a multiple of a page.
|
|
*/
|
|
LOW_PAGES = 1<<(32-PAGE_SHIFT_asm)
|
|
|
|
/*
|
|
* To preserve the DMA pool in PAGEALLOC kernels, we'll allocate
|
|
* pagetables from above the 16MB DMA limit, so we'll have to set
|
|
* up pagetables 16MB more (worst-case):
|
|
*/
|
|
#ifdef CONFIG_DEBUG_PAGEALLOC
|
|
LOW_PAGES = LOW_PAGES + 0x1000000
|
|
#endif
|
|
|
|
#if PTRS_PER_PMD > 1
|
|
PAGE_TABLE_SIZE = (LOW_PAGES / PTRS_PER_PMD) + PTRS_PER_PGD
|
|
#else
|
|
PAGE_TABLE_SIZE = (LOW_PAGES / PTRS_PER_PGD)
|
|
#endif
|
|
BOOTBITMAP_SIZE = LOW_PAGES / 8
|
|
ALLOCATOR_SLOP = 4
|
|
|
|
INIT_MAP_BEYOND_END = BOOTBITMAP_SIZE + (PAGE_TABLE_SIZE + ALLOCATOR_SLOP)*PAGE_SIZE_asm
|
|
|
|
/*
|
|
* 32-bit kernel entrypoint; only used by the boot CPU. On entry,
|
|
* %esi points to the real-mode code as a 32-bit pointer.
|
|
* CS and DS must be 4 GB flat segments, but we don't depend on
|
|
* any particular GDT layout, because we load our own as soon as we
|
|
* can.
|
|
*/
|
|
.section .text.head,"ax",@progbits
|
|
ENTRY(startup_32)
|
|
/* test KEEP_SEGMENTS flag to see if the bootloader is asking
|
|
us to not reload segments */
|
|
testb $(1<<6), BP_loadflags(%esi)
|
|
jnz 2f
|
|
|
|
/*
|
|
* Set segments to known values.
|
|
*/
|
|
lgdt pa(boot_gdt_descr)
|
|
movl $(__BOOT_DS),%eax
|
|
movl %eax,%ds
|
|
movl %eax,%es
|
|
movl %eax,%fs
|
|
movl %eax,%gs
|
|
2:
|
|
|
|
/*
|
|
* Clear BSS first so that there are no surprises...
|
|
*/
|
|
cld
|
|
xorl %eax,%eax
|
|
movl $pa(__bss_start),%edi
|
|
movl $pa(__bss_stop),%ecx
|
|
subl %edi,%ecx
|
|
shrl $2,%ecx
|
|
rep ; stosl
|
|
/*
|
|
* Copy bootup parameters out of the way.
|
|
* Note: %esi still has the pointer to the real-mode data.
|
|
* With the kexec as boot loader, parameter segment might be loaded beyond
|
|
* kernel image and might not even be addressable by early boot page tables.
|
|
* (kexec on panic case). Hence copy out the parameters before initializing
|
|
* page tables.
|
|
*/
|
|
movl $pa(boot_params),%edi
|
|
movl $(PARAM_SIZE/4),%ecx
|
|
cld
|
|
rep
|
|
movsl
|
|
movl pa(boot_params) + NEW_CL_POINTER,%esi
|
|
andl %esi,%esi
|
|
jz 1f # No comand line
|
|
movl $pa(boot_command_line),%edi
|
|
movl $(COMMAND_LINE_SIZE/4),%ecx
|
|
rep
|
|
movsl
|
|
1:
|
|
|
|
#ifdef CONFIG_PARAVIRT
|
|
/* This is can only trip for a broken bootloader... */
|
|
cmpw $0x207, pa(boot_params + BP_version)
|
|
jb default_entry
|
|
|
|
/* Paravirt-compatible boot parameters. Look to see what architecture
|
|
we're booting under. */
|
|
movl pa(boot_params + BP_hardware_subarch), %eax
|
|
cmpl $num_subarch_entries, %eax
|
|
jae bad_subarch
|
|
|
|
movl pa(subarch_entries)(,%eax,4), %eax
|
|
subl $__PAGE_OFFSET, %eax
|
|
jmp *%eax
|
|
|
|
bad_subarch:
|
|
WEAK(lguest_entry)
|
|
WEAK(xen_entry)
|
|
/* Unknown implementation; there's really
|
|
nothing we can do at this point. */
|
|
ud2a
|
|
|
|
__INITDATA
|
|
|
|
subarch_entries:
|
|
.long default_entry /* normal x86/PC */
|
|
.long lguest_entry /* lguest hypervisor */
|
|
.long xen_entry /* Xen hypervisor */
|
|
num_subarch_entries = (. - subarch_entries) / 4
|
|
.previous
|
|
#endif /* CONFIG_PARAVIRT */
|
|
|
|
/*
|
|
* Initialize page tables. This creates a PDE and a set of page
|
|
* tables, which are located immediately beyond _end. The variable
|
|
* init_pg_tables_end is set up to point to the first "safe" location.
|
|
* Mappings are created both at virtual address 0 (identity mapping)
|
|
* and PAGE_OFFSET for up to _end+sizeof(page tables)+INIT_MAP_BEYOND_END.
|
|
*
|
|
* Note that the stack is not yet set up!
|
|
*/
|
|
#define PTE_ATTR 0x007 /* PRESENT+RW+USER */
|
|
#define PDE_ATTR 0x067 /* PRESENT+RW+USER+DIRTY+ACCESSED */
|
|
#define PGD_ATTR 0x001 /* PRESENT (no other attributes) */
|
|
|
|
default_entry:
|
|
#ifdef CONFIG_X86_PAE
|
|
|
|
/*
|
|
* In PAE mode swapper_pg_dir is statically defined to contain enough
|
|
* entries to cover the VMSPLIT option (that is the top 1, 2 or 3
|
|
* entries). The identity mapping is handled by pointing two PGD
|
|
* entries to the first kernel PMD.
|
|
*
|
|
* Note the upper half of each PMD or PTE are always zero at
|
|
* this stage.
|
|
*/
|
|
|
|
#define KPMDS (((-__PAGE_OFFSET) >> 30) & 3) /* Number of kernel PMDs */
|
|
|
|
xorl %ebx,%ebx /* %ebx is kept at zero */
|
|
|
|
movl $pa(pg0), %edi
|
|
movl %edi, pa(init_pg_tables_start)
|
|
movl $pa(swapper_pg_pmd), %edx
|
|
movl $PTE_ATTR, %eax
|
|
10:
|
|
leal PDE_ATTR(%edi),%ecx /* Create PMD entry */
|
|
movl %ecx,(%edx) /* Store PMD entry */
|
|
/* Upper half already zero */
|
|
addl $8,%edx
|
|
movl $512,%ecx
|
|
11:
|
|
stosl
|
|
xchgl %eax,%ebx
|
|
stosl
|
|
xchgl %eax,%ebx
|
|
addl $0x1000,%eax
|
|
loop 11b
|
|
|
|
/*
|
|
* End condition: we must map up to and including INIT_MAP_BEYOND_END
|
|
* bytes beyond the end of our own page tables.
|
|
*/
|
|
leal (INIT_MAP_BEYOND_END+PTE_ATTR)(%edi),%ebp
|
|
cmpl %ebp,%eax
|
|
jb 10b
|
|
1:
|
|
movl %edi,pa(init_pg_tables_end)
|
|
shrl $12, %eax
|
|
movl %eax, pa(max_pfn_mapped)
|
|
|
|
/* Do early initialization of the fixmap area */
|
|
movl $pa(swapper_pg_fixmap)+PDE_ATTR,%eax
|
|
movl %eax,pa(swapper_pg_pmd+0x1000*KPMDS-8)
|
|
#else /* Not PAE */
|
|
|
|
page_pde_offset = (__PAGE_OFFSET >> 20);
|
|
|
|
movl $pa(pg0), %edi
|
|
movl %edi, pa(init_pg_tables_start)
|
|
movl $pa(swapper_pg_dir), %edx
|
|
movl $PTE_ATTR, %eax
|
|
10:
|
|
leal PDE_ATTR(%edi),%ecx /* Create PDE entry */
|
|
movl %ecx,(%edx) /* Store identity PDE entry */
|
|
movl %ecx,page_pde_offset(%edx) /* Store kernel PDE entry */
|
|
addl $4,%edx
|
|
movl $1024, %ecx
|
|
11:
|
|
stosl
|
|
addl $0x1000,%eax
|
|
loop 11b
|
|
/*
|
|
* End condition: we must map up to and including INIT_MAP_BEYOND_END
|
|
* bytes beyond the end of our own page tables; the +0x007 is
|
|
* the attribute bits
|
|
*/
|
|
leal (INIT_MAP_BEYOND_END+PTE_ATTR)(%edi),%ebp
|
|
cmpl %ebp,%eax
|
|
jb 10b
|
|
movl %edi,pa(init_pg_tables_end)
|
|
shrl $12, %eax
|
|
movl %eax, pa(max_pfn_mapped)
|
|
|
|
/* Do early initialization of the fixmap area */
|
|
movl $pa(swapper_pg_fixmap)+PDE_ATTR,%eax
|
|
movl %eax,pa(swapper_pg_dir+0xffc)
|
|
#endif
|
|
jmp 3f
|
|
/*
|
|
* Non-boot CPU entry point; entered from trampoline.S
|
|
* We can't lgdt here, because lgdt itself uses a data segment, but
|
|
* we know the trampoline has already loaded the boot_gdt for us.
|
|
*
|
|
* If cpu hotplug is not supported then this code can go in init section
|
|
* which will be freed later
|
|
*/
|
|
|
|
#ifndef CONFIG_HOTPLUG_CPU
|
|
.section .init.text,"ax",@progbits
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
ENTRY(startup_32_smp)
|
|
cld
|
|
movl $(__BOOT_DS),%eax
|
|
movl %eax,%ds
|
|
movl %eax,%es
|
|
movl %eax,%fs
|
|
movl %eax,%gs
|
|
#endif /* CONFIG_SMP */
|
|
3:
|
|
|
|
/*
|
|
* New page tables may be in 4Mbyte page mode and may
|
|
* be using the global pages.
|
|
*
|
|
* NOTE! If we are on a 486 we may have no cr4 at all!
|
|
* So we do not try to touch it unless we really have
|
|
* some bits in it to set. This won't work if the BSP
|
|
* implements cr4 but this AP does not -- very unlikely
|
|
* but be warned! The same applies to the pse feature
|
|
* if not equally supported. --macro
|
|
*
|
|
* NOTE! We have to correct for the fact that we're
|
|
* not yet offset PAGE_OFFSET..
|
|
*/
|
|
#define cr4_bits pa(mmu_cr4_features)
|
|
movl cr4_bits,%edx
|
|
andl %edx,%edx
|
|
jz 6f
|
|
movl %cr4,%eax # Turn on paging options (PSE,PAE,..)
|
|
orl %edx,%eax
|
|
movl %eax,%cr4
|
|
|
|
btl $5, %eax # check if PAE is enabled
|
|
jnc 6f
|
|
|
|
/* Check if extended functions are implemented */
|
|
movl $0x80000000, %eax
|
|
cpuid
|
|
cmpl $0x80000000, %eax
|
|
jbe 6f
|
|
mov $0x80000001, %eax
|
|
cpuid
|
|
/* Execute Disable bit supported? */
|
|
btl $20, %edx
|
|
jnc 6f
|
|
|
|
/* Setup EFER (Extended Feature Enable Register) */
|
|
movl $0xc0000080, %ecx
|
|
rdmsr
|
|
|
|
btsl $11, %eax
|
|
/* Make changes effective */
|
|
wrmsr
|
|
|
|
6:
|
|
|
|
/*
|
|
* Enable paging
|
|
*/
|
|
movl $pa(swapper_pg_dir),%eax
|
|
movl %eax,%cr3 /* set the page table pointer.. */
|
|
movl %cr0,%eax
|
|
orl $X86_CR0_PG,%eax
|
|
movl %eax,%cr0 /* ..and set paging (PG) bit */
|
|
ljmp $__BOOT_CS,$1f /* Clear prefetch and normalize %eip */
|
|
1:
|
|
/* Set up the stack pointer */
|
|
lss stack_start,%esp
|
|
|
|
/*
|
|
* Initialize eflags. Some BIOS's leave bits like NT set. This would
|
|
* confuse the debugger if this code is traced.
|
|
* XXX - best to initialize before switching to protected mode.
|
|
*/
|
|
pushl $0
|
|
popfl
|
|
|
|
#ifdef CONFIG_SMP
|
|
cmpb $0, ready
|
|
jz 1f /* Initial CPU cleans BSS */
|
|
jmp checkCPUtype
|
|
1:
|
|
#endif /* CONFIG_SMP */
|
|
|
|
/*
|
|
* start system 32-bit setup. We need to re-do some of the things done
|
|
* in 16-bit mode for the "real" operations.
|
|
*/
|
|
call setup_idt
|
|
|
|
checkCPUtype:
|
|
|
|
movl $-1,X86_CPUID # -1 for no CPUID initially
|
|
|
|
/* check if it is 486 or 386. */
|
|
/*
|
|
* XXX - this does a lot of unnecessary setup. Alignment checks don't
|
|
* apply at our cpl of 0 and the stack ought to be aligned already, and
|
|
* we don't need to preserve eflags.
|
|
*/
|
|
|
|
movb $3,X86 # at least 386
|
|
pushfl # push EFLAGS
|
|
popl %eax # get EFLAGS
|
|
movl %eax,%ecx # save original EFLAGS
|
|
xorl $0x240000,%eax # flip AC and ID bits in EFLAGS
|
|
pushl %eax # copy to EFLAGS
|
|
popfl # set EFLAGS
|
|
pushfl # get new EFLAGS
|
|
popl %eax # put it in eax
|
|
xorl %ecx,%eax # change in flags
|
|
pushl %ecx # restore original EFLAGS
|
|
popfl
|
|
testl $0x40000,%eax # check if AC bit changed
|
|
je is386
|
|
|
|
movb $4,X86 # at least 486
|
|
testl $0x200000,%eax # check if ID bit changed
|
|
je is486
|
|
|
|
/* get vendor info */
|
|
xorl %eax,%eax # call CPUID with 0 -> return vendor ID
|
|
cpuid
|
|
movl %eax,X86_CPUID # save CPUID level
|
|
movl %ebx,X86_VENDOR_ID # lo 4 chars
|
|
movl %edx,X86_VENDOR_ID+4 # next 4 chars
|
|
movl %ecx,X86_VENDOR_ID+8 # last 4 chars
|
|
|
|
orl %eax,%eax # do we have processor info as well?
|
|
je is486
|
|
|
|
movl $1,%eax # Use the CPUID instruction to get CPU type
|
|
cpuid
|
|
movb %al,%cl # save reg for future use
|
|
andb $0x0f,%ah # mask processor family
|
|
movb %ah,X86
|
|
andb $0xf0,%al # mask model
|
|
shrb $4,%al
|
|
movb %al,X86_MODEL
|
|
andb $0x0f,%cl # mask mask revision
|
|
movb %cl,X86_MASK
|
|
movl %edx,X86_CAPABILITY
|
|
|
|
is486: movl $0x50022,%ecx # set AM, WP, NE and MP
|
|
jmp 2f
|
|
|
|
is386: movl $2,%ecx # set MP
|
|
2: movl %cr0,%eax
|
|
andl $0x80000011,%eax # Save PG,PE,ET
|
|
orl %ecx,%eax
|
|
movl %eax,%cr0
|
|
|
|
call check_x87
|
|
lgdt early_gdt_descr
|
|
lidt idt_descr
|
|
ljmp $(__KERNEL_CS),$1f
|
|
1: movl $(__KERNEL_DS),%eax # reload all the segment registers
|
|
movl %eax,%ss # after changing gdt.
|
|
movl %eax,%fs # gets reset once there's real percpu
|
|
|
|
movl $(__USER_DS),%eax # DS/ES contains default USER segment
|
|
movl %eax,%ds
|
|
movl %eax,%es
|
|
|
|
xorl %eax,%eax # Clear GS and LDT
|
|
movl %eax,%gs
|
|
lldt %ax
|
|
|
|
cld # gcc2 wants the direction flag cleared at all times
|
|
pushl $0 # fake return address for unwinder
|
|
#ifdef CONFIG_SMP
|
|
movb ready, %cl
|
|
movb $1, ready
|
|
cmpb $0,%cl # the first CPU calls start_kernel
|
|
je 1f
|
|
movl $(__KERNEL_PERCPU), %eax
|
|
movl %eax,%fs # set this cpu's percpu
|
|
movl (stack_start), %esp
|
|
1:
|
|
#endif /* CONFIG_SMP */
|
|
jmp *(initial_code)
|
|
|
|
/*
|
|
* We depend on ET to be correct. This checks for 287/387.
|
|
*/
|
|
check_x87:
|
|
movb $0,X86_HARD_MATH
|
|
clts
|
|
fninit
|
|
fstsw %ax
|
|
cmpb $0,%al
|
|
je 1f
|
|
movl %cr0,%eax /* no coprocessor: have to set bits */
|
|
xorl $4,%eax /* set EM */
|
|
movl %eax,%cr0
|
|
ret
|
|
ALIGN
|
|
1: movb $1,X86_HARD_MATH
|
|
.byte 0xDB,0xE4 /* fsetpm for 287, ignored by 387 */
|
|
ret
|
|
|
|
/*
|
|
* setup_idt
|
|
*
|
|
* sets up a idt with 256 entries pointing to
|
|
* ignore_int, interrupt gates. It doesn't actually load
|
|
* idt - that can be done only after paging has been enabled
|
|
* and the kernel moved to PAGE_OFFSET. Interrupts
|
|
* are enabled elsewhere, when we can be relatively
|
|
* sure everything is ok.
|
|
*
|
|
* Warning: %esi is live across this function.
|
|
*/
|
|
setup_idt:
|
|
lea ignore_int,%edx
|
|
movl $(__KERNEL_CS << 16),%eax
|
|
movw %dx,%ax /* selector = 0x0010 = cs */
|
|
movw $0x8E00,%dx /* interrupt gate - dpl=0, present */
|
|
|
|
lea idt_table,%edi
|
|
mov $256,%ecx
|
|
rp_sidt:
|
|
movl %eax,(%edi)
|
|
movl %edx,4(%edi)
|
|
addl $8,%edi
|
|
dec %ecx
|
|
jne rp_sidt
|
|
|
|
.macro set_early_handler handler,trapno
|
|
lea \handler,%edx
|
|
movl $(__KERNEL_CS << 16),%eax
|
|
movw %dx,%ax
|
|
movw $0x8E00,%dx /* interrupt gate - dpl=0, present */
|
|
lea idt_table,%edi
|
|
movl %eax,8*\trapno(%edi)
|
|
movl %edx,8*\trapno+4(%edi)
|
|
.endm
|
|
|
|
set_early_handler handler=early_divide_err,trapno=0
|
|
set_early_handler handler=early_illegal_opcode,trapno=6
|
|
set_early_handler handler=early_protection_fault,trapno=13
|
|
set_early_handler handler=early_page_fault,trapno=14
|
|
|
|
ret
|
|
|
|
early_divide_err:
|
|
xor %edx,%edx
|
|
pushl $0 /* fake errcode */
|
|
jmp early_fault
|
|
|
|
early_illegal_opcode:
|
|
movl $6,%edx
|
|
pushl $0 /* fake errcode */
|
|
jmp early_fault
|
|
|
|
early_protection_fault:
|
|
movl $13,%edx
|
|
jmp early_fault
|
|
|
|
early_page_fault:
|
|
movl $14,%edx
|
|
jmp early_fault
|
|
|
|
early_fault:
|
|
cld
|
|
#ifdef CONFIG_PRINTK
|
|
pusha
|
|
movl $(__KERNEL_DS),%eax
|
|
movl %eax,%ds
|
|
movl %eax,%es
|
|
cmpl $2,early_recursion_flag
|
|
je hlt_loop
|
|
incl early_recursion_flag
|
|
movl %cr2,%eax
|
|
pushl %eax
|
|
pushl %edx /* trapno */
|
|
pushl $fault_msg
|
|
#ifdef CONFIG_EARLY_PRINTK
|
|
call early_printk
|
|
#else
|
|
call printk
|
|
#endif
|
|
#endif
|
|
call dump_stack
|
|
hlt_loop:
|
|
hlt
|
|
jmp hlt_loop
|
|
|
|
/* This is the default interrupt "handler" :-) */
|
|
ALIGN
|
|
ignore_int:
|
|
cld
|
|
#ifdef CONFIG_PRINTK
|
|
pushl %eax
|
|
pushl %ecx
|
|
pushl %edx
|
|
pushl %es
|
|
pushl %ds
|
|
movl $(__KERNEL_DS),%eax
|
|
movl %eax,%ds
|
|
movl %eax,%es
|
|
cmpl $2,early_recursion_flag
|
|
je hlt_loop
|
|
incl early_recursion_flag
|
|
pushl 16(%esp)
|
|
pushl 24(%esp)
|
|
pushl 32(%esp)
|
|
pushl 40(%esp)
|
|
pushl $int_msg
|
|
#ifdef CONFIG_EARLY_PRINTK
|
|
call early_printk
|
|
#else
|
|
call printk
|
|
#endif
|
|
addl $(5*4),%esp
|
|
popl %ds
|
|
popl %es
|
|
popl %edx
|
|
popl %ecx
|
|
popl %eax
|
|
#endif
|
|
iret
|
|
|
|
.section .cpuinit.data,"wa"
|
|
.align 4
|
|
ENTRY(initial_code)
|
|
.long i386_start_kernel
|
|
|
|
.section .text
|
|
/*
|
|
* Real beginning of normal "text" segment
|
|
*/
|
|
ENTRY(stext)
|
|
ENTRY(_stext)
|
|
|
|
/*
|
|
* BSS section
|
|
*/
|
|
.section ".bss.page_aligned","wa"
|
|
.align PAGE_SIZE_asm
|
|
#ifdef CONFIG_X86_PAE
|
|
swapper_pg_pmd:
|
|
.fill 1024*KPMDS,4,0
|
|
#else
|
|
ENTRY(swapper_pg_dir)
|
|
.fill 1024,4,0
|
|
#endif
|
|
swapper_pg_fixmap:
|
|
.fill 1024,4,0
|
|
ENTRY(empty_zero_page)
|
|
.fill 4096,1,0
|
|
/*
|
|
* This starts the data section.
|
|
*/
|
|
#ifdef CONFIG_X86_PAE
|
|
.section ".data.page_aligned","wa"
|
|
/* Page-aligned for the benefit of paravirt? */
|
|
.align PAGE_SIZE_asm
|
|
ENTRY(swapper_pg_dir)
|
|
.long pa(swapper_pg_pmd+PGD_ATTR),0 /* low identity map */
|
|
# if KPMDS == 3
|
|
.long pa(swapper_pg_pmd+PGD_ATTR),0
|
|
.long pa(swapper_pg_pmd+PGD_ATTR+0x1000),0
|
|
.long pa(swapper_pg_pmd+PGD_ATTR+0x2000),0
|
|
# elif KPMDS == 2
|
|
.long 0,0
|
|
.long pa(swapper_pg_pmd+PGD_ATTR),0
|
|
.long pa(swapper_pg_pmd+PGD_ATTR+0x1000),0
|
|
# elif KPMDS == 1
|
|
.long 0,0
|
|
.long 0,0
|
|
.long pa(swapper_pg_pmd+PGD_ATTR),0
|
|
# else
|
|
# error "Kernel PMDs should be 1, 2 or 3"
|
|
# endif
|
|
.align PAGE_SIZE_asm /* needs to be page-sized too */
|
|
#endif
|
|
|
|
.data
|
|
ENTRY(stack_start)
|
|
.long init_thread_union+THREAD_SIZE
|
|
.long __BOOT_DS
|
|
|
|
ready: .byte 0
|
|
|
|
early_recursion_flag:
|
|
.long 0
|
|
|
|
int_msg:
|
|
.asciz "Unknown interrupt or fault at EIP %p %p %p\n"
|
|
|
|
fault_msg:
|
|
/* fault info: */
|
|
.ascii "BUG: Int %d: CR2 %p\n"
|
|
/* pusha regs: */
|
|
.ascii " EDI %p ESI %p EBP %p ESP %p\n"
|
|
.ascii " EBX %p EDX %p ECX %p EAX %p\n"
|
|
/* fault frame: */
|
|
.ascii " err %p EIP %p CS %p flg %p\n"
|
|
.ascii "Stack: %p %p %p %p %p %p %p %p\n"
|
|
.ascii " %p %p %p %p %p %p %p %p\n"
|
|
.asciz " %p %p %p %p %p %p %p %p\n"
|
|
|
|
#include "../../x86/xen/xen-head.S"
|
|
|
|
/*
|
|
* The IDT and GDT 'descriptors' are a strange 48-bit object
|
|
* only used by the lidt and lgdt instructions. They are not
|
|
* like usual segment descriptors - they consist of a 16-bit
|
|
* segment size, and 32-bit linear address value:
|
|
*/
|
|
|
|
.globl boot_gdt_descr
|
|
.globl idt_descr
|
|
|
|
ALIGN
|
|
# early boot GDT descriptor (must use 1:1 address mapping)
|
|
.word 0 # 32 bit align gdt_desc.address
|
|
boot_gdt_descr:
|
|
.word __BOOT_DS+7
|
|
.long boot_gdt - __PAGE_OFFSET
|
|
|
|
.word 0 # 32-bit align idt_desc.address
|
|
idt_descr:
|
|
.word IDT_ENTRIES*8-1 # idt contains 256 entries
|
|
.long idt_table
|
|
|
|
# boot GDT descriptor (later on used by CPU#0):
|
|
.word 0 # 32 bit align gdt_desc.address
|
|
ENTRY(early_gdt_descr)
|
|
.word GDT_ENTRIES*8-1
|
|
.long per_cpu__gdt_page /* Overwritten for secondary CPUs */
|
|
|
|
/*
|
|
* The boot_gdt must mirror the equivalent in setup.S and is
|
|
* used only for booting.
|
|
*/
|
|
.align L1_CACHE_BYTES
|
|
ENTRY(boot_gdt)
|
|
.fill GDT_ENTRY_BOOT_CS,8,0
|
|
.quad 0x00cf9a000000ffff /* kernel 4GB code at 0x00000000 */
|
|
.quad 0x00cf92000000ffff /* kernel 4GB data at 0x00000000 */
|