# default subarch .h files
mflags-y += -Iinclude/asm-i386/mach-default
-head-y := arch/i386/kernel/head.o arch/i386/kernel/init_task_32.o
+head-y := arch/i386/kernel/head_32.o arch/i386/kernel/init_task_32.o
libs-y += arch/i386/lib/
core-y += arch/i386/kernel/ \
# Makefile for the linux kernel.
#
-extra-y := head.o init_task_32.o vmlinux.lds
+extra-y := head_32.o init_task_32.o vmlinux.lds
obj-y := process_32.o signal_32.o entry_32.o traps_32.o irq_32.o \
ptrace_32.o time_32.o ioport_32.o ldt_32.o setup_32.o i8259_32.o sys_i386_32.o \
+++ /dev/null
-/*
- * 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
- */
-
-#ifndef CONFIG_HOTPLUG_CPU
-.section .init.text,"ax",@progbits
-#endif
-
- /* Do an early initialization of the fixmap area */
- movl $(swapper_pg_dir - __PAGE_OFFSET), %edx
- movl $(swapper_pg_pmd - __PAGE_OFFSET), %eax
- addl $0x007, %eax /* 0x007 = PRESENT+RW+USER */
- movl %eax, 4092(%edx)
-
-#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","wa"
- .align PAGE_SIZE_asm
-ENTRY(swapper_pg_dir)
- .fill 1024,4,0
-ENTRY(swapper_pg_pmd)
- .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"
-
-#include "../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 */
--- /dev/null
+/*
+ * 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
+ */
+
+#ifndef CONFIG_HOTPLUG_CPU
+.section .init.text,"ax",@progbits
+#endif
+
+ /* Do an early initialization of the fixmap area */
+ movl $(swapper_pg_dir - __PAGE_OFFSET), %edx
+ movl $(swapper_pg_pmd - __PAGE_OFFSET), %eax
+ addl $0x007, %eax /* 0x007 = PRESENT+RW+USER */
+ movl %eax, 4092(%edx)
+
+#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","wa"
+ .align PAGE_SIZE_asm
+ENTRY(swapper_pg_dir)
+ .fill 1024,4,0
+ENTRY(swapper_pg_pmd)
+ .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"
+
+#include "../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 */
projects / deliverable / linux.git / commitdiff
