5a18c92aab
This reverts commit c9ccf30d77.
Entering the kernel at startup_32 without passing our real mode data in
%esi, and without guaranteeing that physical and virtual addresses are
identity mapped makes head.S impossible to maintain.
The only user of this infrastructure is lguest which is not merged so
nothing we currently support will break by removing this over designed
nightmare, and only the pending lguest patches will be affected. The
pending Xen patches have a different entry point that they use.
We are currently discussing what Xen and lguest need to do to boot the
kernel in a more normal fashion so using startup_32 in this weird manner is
clearly not their long term direction.
So let's remove this code in head.S before it causes brain damage to people
trying to maintain head.S
Cc: Chris Wright <chrisw@sous-sol.org>
Cc: Andi Kleen <ak@suse.de>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Zachary Amsden <zach@vmware.com>
CC: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
570 lines
14 KiB
ArmAsm
570 lines
14 KiB
ArmAsm
/*
|
|
* linux/arch/i386/kernel/head.S -- the 32-bit startup code.
|
|
*
|
|
* 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/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>
|
|
|
|
/*
|
|
* 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)
|
|
|
|
#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)
|
|
|
|
/*
|
|
* Set segments to known values.
|
|
*/
|
|
cld
|
|
lgdt boot_gdt_descr - __PAGE_OFFSET
|
|
movl $(__BOOT_DS),%eax
|
|
movl %eax,%ds
|
|
movl %eax,%es
|
|
movl %eax,%fs
|
|
movl %eax,%gs
|
|
|
|
/*
|
|
* Clear BSS first so that there are no surprises...
|
|
* No need to cld as DF is already clear from cld above...
|
|
*/
|
|
xorl %eax,%eax
|
|
movl $__bss_start - __PAGE_OFFSET,%edi
|
|
movl $__bss_stop - __PAGE_OFFSET,%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 $(boot_params - __PAGE_OFFSET),%edi
|
|
movl $(PARAM_SIZE/4),%ecx
|
|
cld
|
|
rep
|
|
movsl
|
|
movl boot_params - __PAGE_OFFSET + NEW_CL_POINTER,%esi
|
|
andl %esi,%esi
|
|
jnz 2f # New command line protocol
|
|
cmpw $(OLD_CL_MAGIC),OLD_CL_MAGIC_ADDR
|
|
jne 1f
|
|
movzwl OLD_CL_OFFSET,%esi
|
|
addl $(OLD_CL_BASE_ADDR),%esi
|
|
2:
|
|
movl $(boot_command_line - __PAGE_OFFSET),%edi
|
|
movl $(COMMAND_LINE_SIZE/4),%ecx
|
|
rep
|
|
movsl
|
|
1:
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* Warning: don't use %esi or the stack in this code. However, %esp
|
|
* can be used as a GPR if you really need it...
|
|
*/
|
|
page_pde_offset = (__PAGE_OFFSET >> 20);
|
|
|
|
movl $(pg0 - __PAGE_OFFSET), %edi
|
|
movl $(swapper_pg_dir - __PAGE_OFFSET), %edx
|
|
movl $0x007, %eax /* 0x007 = PRESENT+RW+USER */
|
|
10:
|
|
leal 0x007(%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+0x007)(%edi),%ebp
|
|
cmpl %ebp,%eax
|
|
jb 10b
|
|
movl %edi,(init_pg_tables_end - __PAGE_OFFSET)
|
|
|
|
xorl %ebx,%ebx /* This is the boot CPU (BSP) */
|
|
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
|
|
*/
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
.section .text,"ax",@progbits
|
|
#else
|
|
.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
|
|
|
|
/*
|
|
* 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 mmu_cr4_features-__PAGE_OFFSET
|
|
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:
|
|
/* This is a secondary processor (AP) */
|
|
xorl %ebx,%ebx
|
|
incl %ebx
|
|
|
|
#endif /* CONFIG_SMP */
|
|
3:
|
|
|
|
/*
|
|
* Enable paging
|
|
*/
|
|
movl $swapper_pg_dir-__PAGE_OFFSET,%eax
|
|
movl %eax,%cr3 /* set the page table pointer.. */
|
|
movl %cr0,%eax
|
|
orl $0x80000000,%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
|
|
andl %ebx,%ebx
|
|
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
|
|
jmp initialize_secondary # all other CPUs call initialize_secondary
|
|
1:
|
|
#endif /* CONFIG_SMP */
|
|
jmp start_kernel
|
|
|
|
/*
|
|
* 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
|
|
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
|
|
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 .text
|
|
/*
|
|
* Real beginning of normal "text" segment
|
|
*/
|
|
ENTRY(stext)
|
|
ENTRY(_stext)
|
|
|
|
/*
|
|
* BSS section
|
|
*/
|
|
.section ".bss.page_aligned","w"
|
|
ENTRY(swapper_pg_dir)
|
|
.fill 1024,4,0
|
|
ENTRY(empty_zero_page)
|
|
.fill 4096,1,0
|
|
|
|
/*
|
|
* This starts the data section.
|
|
*/
|
|
.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:
|
|
.ascii "Int %d: CR2 %p err %p EIP %p CS %p flags %p\n"
|
|
.asciz "Stack: %p %p %p %p %p %p %p %p\n"
|
|
|
|
/*
|
|
* 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 */
|