forked from Minki/linux
cdeb604894
The early_idt_handlers asm code generates an array of entry
points spaced nine bytes apart. It's not really clear from that
code or from the places that reference it what's going on, and
the code only works in the first place because GAS never
generates two-byte JMP instructions when jumping to global
labels.
Clean up the code to generate the correct array stride (member size)
explicitly. This should be considerably more robust against
screw-ups, as GAS will warn if a .fill directive has a negative
count. Using '. =' to advance would have been even more robust
(it would generate an actual error if it tried to move
backwards), but it would pad with nulls, confusing anyone who
tries to disassemble the code. The new scheme should be much
clearer to future readers.
While we're at it, improve the comments and rename the array and
common code.
Binutils may start relaxing jumps to non-weak labels. If so,
this change will fix our build, and we may need to backport this
change.
Before, on x86_64:
0000000000000000 <early_idt_handlers>:
0: 6a 00 pushq $0x0
2: 6a 00 pushq $0x0
4: e9 00 00 00 00 jmpq 9 <early_idt_handlers+0x9>
5: R_X86_64_PC32 early_idt_handler-0x4
...
48: 66 90 xchg %ax,%ax
4a: 6a 08 pushq $0x8
4c: e9 00 00 00 00 jmpq 51 <early_idt_handlers+0x51>
4d: R_X86_64_PC32 early_idt_handler-0x4
...
117: 6a 00 pushq $0x0
119: 6a 1f pushq $0x1f
11b: e9 00 00 00 00 jmpq 120 <early_idt_handler>
11c: R_X86_64_PC32 early_idt_handler-0x4
After:
0000000000000000 <early_idt_handler_array>:
0: 6a 00 pushq $0x0
2: 6a 00 pushq $0x0
4: e9 14 01 00 00 jmpq 11d <early_idt_handler_common>
...
48: 6a 08 pushq $0x8
4a: e9 d1 00 00 00 jmpq 120 <early_idt_handler_common>
4f: cc int3
50: cc int3
...
117: 6a 00 pushq $0x0
119: 6a 1f pushq $0x1f
11b: eb 03 jmp 120 <early_idt_handler_common>
11d: cc int3
11e: cc int3
11f: cc int3
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Acked-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Binutils <binutils@sourceware.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H.J. Lu <hjl.tools@gmail.com>
Cc: Jan Beulich <JBeulich@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/ac027962af343b0c599cbfcf50b945ad2ef3d7a8.1432336324.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
765 lines
18 KiB
ArmAsm
765 lines
18 KiB
ArmAsm
/*
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* Enhanced CPU detection and feature setting code by Mike Jagdis
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* and Martin Mares, November 1997.
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*/
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.text
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#include <linux/threads.h>
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <asm/segment.h>
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#include <asm/page_types.h>
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#include <asm/pgtable_types.h>
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#include <asm/cache.h>
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#include <asm/thread_info.h>
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#include <asm/asm-offsets.h>
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#include <asm/setup.h>
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#include <asm/processor-flags.h>
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#include <asm/msr-index.h>
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#include <asm/cpufeature.h>
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#include <asm/percpu.h>
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#include <asm/nops.h>
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#include <asm/bootparam.h>
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/* Physical address */
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#define pa(X) ((X) - __PAGE_OFFSET)
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/*
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* References to members of the new_cpu_data structure.
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*/
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#define X86 new_cpu_data+CPUINFO_x86
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#define X86_VENDOR new_cpu_data+CPUINFO_x86_vendor
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#define X86_MODEL new_cpu_data+CPUINFO_x86_model
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#define X86_MASK new_cpu_data+CPUINFO_x86_mask
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#define X86_HARD_MATH new_cpu_data+CPUINFO_hard_math
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#define X86_CPUID new_cpu_data+CPUINFO_cpuid_level
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#define X86_CAPABILITY new_cpu_data+CPUINFO_x86_capability
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#define X86_VENDOR_ID new_cpu_data+CPUINFO_x86_vendor_id
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/*
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* This is how much memory in addition to the memory covered up to
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* and including _end we need mapped initially.
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* We need:
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* (KERNEL_IMAGE_SIZE/4096) / 1024 pages (worst case, non PAE)
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* (KERNEL_IMAGE_SIZE/4096) / 512 + 4 pages (worst case for PAE)
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*
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* Modulo rounding, each megabyte assigned here requires a kilobyte of
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* memory, which is currently unreclaimed.
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*
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* This should be a multiple of a page.
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*
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* KERNEL_IMAGE_SIZE should be greater than pa(_end)
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* and small than max_low_pfn, otherwise will waste some page table entries
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*/
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#if PTRS_PER_PMD > 1
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#define PAGE_TABLE_SIZE(pages) (((pages) / PTRS_PER_PMD) + PTRS_PER_PGD)
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#else
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#define PAGE_TABLE_SIZE(pages) ((pages) / PTRS_PER_PGD)
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#endif
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/* Number of possible pages in the lowmem region */
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LOWMEM_PAGES = (((1<<32) - __PAGE_OFFSET) >> PAGE_SHIFT)
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/* Enough space to fit pagetables for the low memory linear map */
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MAPPING_BEYOND_END = PAGE_TABLE_SIZE(LOWMEM_PAGES) << PAGE_SHIFT
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/*
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* Worst-case size of the kernel mapping we need to make:
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* a relocatable kernel can live anywhere in lowmem, so we need to be able
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* to map all of lowmem.
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*/
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KERNEL_PAGES = LOWMEM_PAGES
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INIT_MAP_SIZE = PAGE_TABLE_SIZE(KERNEL_PAGES) * PAGE_SIZE
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RESERVE_BRK(pagetables, INIT_MAP_SIZE)
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/*
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* 32-bit kernel entrypoint; only used by the boot CPU. On entry,
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* %esi points to the real-mode code as a 32-bit pointer.
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* CS and DS must be 4 GB flat segments, but we don't depend on
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* any particular GDT layout, because we load our own as soon as we
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* can.
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*/
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__HEAD
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ENTRY(startup_32)
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movl pa(stack_start),%ecx
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/* test KEEP_SEGMENTS flag to see if the bootloader is asking
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us to not reload segments */
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testb $KEEP_SEGMENTS, BP_loadflags(%esi)
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jnz 2f
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/*
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* Set segments to known values.
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*/
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lgdt pa(boot_gdt_descr)
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movl $(__BOOT_DS),%eax
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movl %eax,%ds
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movl %eax,%es
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movl %eax,%fs
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movl %eax,%gs
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movl %eax,%ss
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2:
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leal -__PAGE_OFFSET(%ecx),%esp
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/*
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* Clear BSS first so that there are no surprises...
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*/
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cld
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xorl %eax,%eax
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movl $pa(__bss_start),%edi
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movl $pa(__bss_stop),%ecx
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subl %edi,%ecx
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shrl $2,%ecx
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rep ; stosl
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/*
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* Copy bootup parameters out of the way.
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* Note: %esi still has the pointer to the real-mode data.
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* With the kexec as boot loader, parameter segment might be loaded beyond
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* kernel image and might not even be addressable by early boot page tables.
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* (kexec on panic case). Hence copy out the parameters before initializing
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* page tables.
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*/
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movl $pa(boot_params),%edi
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movl $(PARAM_SIZE/4),%ecx
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cld
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rep
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movsl
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movl pa(boot_params) + NEW_CL_POINTER,%esi
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andl %esi,%esi
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jz 1f # No command line
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movl $pa(boot_command_line),%edi
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movl $(COMMAND_LINE_SIZE/4),%ecx
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rep
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movsl
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1:
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#ifdef CONFIG_OLPC
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/* save OFW's pgdir table for later use when calling into OFW */
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movl %cr3, %eax
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movl %eax, pa(olpc_ofw_pgd)
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#endif
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#ifdef CONFIG_MICROCODE_EARLY
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/* Early load ucode on BSP. */
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call load_ucode_bsp
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#endif
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/*
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* Initialize page tables. This creates a PDE and a set of page
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* tables, which are located immediately beyond __brk_base. The variable
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* _brk_end is set up to point to the first "safe" location.
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* Mappings are created both at virtual address 0 (identity mapping)
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* and PAGE_OFFSET for up to _end.
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*/
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#ifdef CONFIG_X86_PAE
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/*
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* In PAE mode initial_page_table is statically defined to contain
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* enough entries to cover the VMSPLIT option (that is the top 1, 2 or 3
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* entries). The identity mapping is handled by pointing two PGD entries
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* to the first kernel PMD.
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*
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* Note the upper half of each PMD or PTE are always zero at this stage.
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*/
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#define KPMDS (((-__PAGE_OFFSET) >> 30) & 3) /* Number of kernel PMDs */
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xorl %ebx,%ebx /* %ebx is kept at zero */
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movl $pa(__brk_base), %edi
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movl $pa(initial_pg_pmd), %edx
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movl $PTE_IDENT_ATTR, %eax
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10:
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leal PDE_IDENT_ATTR(%edi),%ecx /* Create PMD entry */
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movl %ecx,(%edx) /* Store PMD entry */
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/* Upper half already zero */
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addl $8,%edx
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movl $512,%ecx
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11:
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stosl
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xchgl %eax,%ebx
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stosl
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xchgl %eax,%ebx
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addl $0x1000,%eax
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loop 11b
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/*
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* End condition: we must map up to the end + MAPPING_BEYOND_END.
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*/
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movl $pa(_end) + MAPPING_BEYOND_END + PTE_IDENT_ATTR, %ebp
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cmpl %ebp,%eax
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jb 10b
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1:
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addl $__PAGE_OFFSET, %edi
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movl %edi, pa(_brk_end)
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shrl $12, %eax
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movl %eax, pa(max_pfn_mapped)
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/* Do early initialization of the fixmap area */
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movl $pa(initial_pg_fixmap)+PDE_IDENT_ATTR,%eax
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movl %eax,pa(initial_pg_pmd+0x1000*KPMDS-8)
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#else /* Not PAE */
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page_pde_offset = (__PAGE_OFFSET >> 20);
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movl $pa(__brk_base), %edi
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movl $pa(initial_page_table), %edx
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movl $PTE_IDENT_ATTR, %eax
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10:
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leal PDE_IDENT_ATTR(%edi),%ecx /* Create PDE entry */
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movl %ecx,(%edx) /* Store identity PDE entry */
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movl %ecx,page_pde_offset(%edx) /* Store kernel PDE entry */
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addl $4,%edx
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movl $1024, %ecx
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11:
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stosl
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addl $0x1000,%eax
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loop 11b
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/*
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* End condition: we must map up to the end + MAPPING_BEYOND_END.
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*/
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movl $pa(_end) + MAPPING_BEYOND_END + PTE_IDENT_ATTR, %ebp
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cmpl %ebp,%eax
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jb 10b
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addl $__PAGE_OFFSET, %edi
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movl %edi, pa(_brk_end)
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shrl $12, %eax
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movl %eax, pa(max_pfn_mapped)
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/* Do early initialization of the fixmap area */
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movl $pa(initial_pg_fixmap)+PDE_IDENT_ATTR,%eax
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movl %eax,pa(initial_page_table+0xffc)
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#endif
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#ifdef CONFIG_PARAVIRT
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/* This is can only trip for a broken bootloader... */
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cmpw $0x207, pa(boot_params + BP_version)
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jb default_entry
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/* Paravirt-compatible boot parameters. Look to see what architecture
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we're booting under. */
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movl pa(boot_params + BP_hardware_subarch), %eax
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cmpl $num_subarch_entries, %eax
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jae bad_subarch
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movl pa(subarch_entries)(,%eax,4), %eax
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subl $__PAGE_OFFSET, %eax
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jmp *%eax
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bad_subarch:
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WEAK(lguest_entry)
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WEAK(xen_entry)
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/* Unknown implementation; there's really
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nothing we can do at this point. */
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ud2a
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__INITDATA
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subarch_entries:
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.long default_entry /* normal x86/PC */
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.long lguest_entry /* lguest hypervisor */
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.long xen_entry /* Xen hypervisor */
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.long default_entry /* Moorestown MID */
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num_subarch_entries = (. - subarch_entries) / 4
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.previous
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#else
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jmp default_entry
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#endif /* CONFIG_PARAVIRT */
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#ifdef CONFIG_HOTPLUG_CPU
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/*
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* Boot CPU0 entry point. It's called from play_dead(). Everything has been set
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* up already except stack. We just set up stack here. Then call
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* start_secondary().
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*/
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ENTRY(start_cpu0)
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movl stack_start, %ecx
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movl %ecx, %esp
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jmp *(initial_code)
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ENDPROC(start_cpu0)
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#endif
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/*
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* Non-boot CPU entry point; entered from trampoline.S
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* We can't lgdt here, because lgdt itself uses a data segment, but
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* we know the trampoline has already loaded the boot_gdt for us.
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*
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* If cpu hotplug is not supported then this code can go in init section
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* which will be freed later
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*/
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ENTRY(startup_32_smp)
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cld
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movl $(__BOOT_DS),%eax
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movl %eax,%ds
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movl %eax,%es
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movl %eax,%fs
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movl %eax,%gs
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movl pa(stack_start),%ecx
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movl %eax,%ss
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leal -__PAGE_OFFSET(%ecx),%esp
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#ifdef CONFIG_MICROCODE_EARLY
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/* Early load ucode on AP. */
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call load_ucode_ap
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#endif
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default_entry:
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#define CR0_STATE (X86_CR0_PE | X86_CR0_MP | X86_CR0_ET | \
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X86_CR0_NE | X86_CR0_WP | X86_CR0_AM | \
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X86_CR0_PG)
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movl $(CR0_STATE & ~X86_CR0_PG),%eax
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movl %eax,%cr0
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/*
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* We want to start out with EFLAGS unambiguously cleared. Some BIOSes leave
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* bits like NT set. This would confuse the debugger if this code is traced. So
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* initialize them properly now before switching to protected mode. That means
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* DF in particular (even though we have cleared it earlier after copying the
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* command line) because GCC expects it.
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*/
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pushl $0
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popfl
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/*
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* New page tables may be in 4Mbyte page mode and may be using the global pages.
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*
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* NOTE! If we are on a 486 we may have no cr4 at all! Specifically, cr4 exists
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* if and only if CPUID exists and has flags other than the FPU flag set.
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*/
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movl $-1,pa(X86_CPUID) # preset CPUID level
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movl $X86_EFLAGS_ID,%ecx
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pushl %ecx
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popfl # set EFLAGS=ID
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pushfl
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popl %eax # get EFLAGS
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testl $X86_EFLAGS_ID,%eax # did EFLAGS.ID remained set?
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jz enable_paging # hw disallowed setting of ID bit
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# which means no CPUID and no CR4
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xorl %eax,%eax
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cpuid
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movl %eax,pa(X86_CPUID) # save largest std CPUID function
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movl $1,%eax
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cpuid
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andl $~1,%edx # Ignore CPUID.FPU
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jz enable_paging # No flags or only CPUID.FPU = no CR4
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movl pa(mmu_cr4_features),%eax
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movl %eax,%cr4
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testb $X86_CR4_PAE, %al # check if PAE is enabled
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jz enable_paging
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/* Check if extended functions are implemented */
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movl $0x80000000, %eax
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cpuid
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/* Value must be in the range 0x80000001 to 0x8000ffff */
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subl $0x80000001, %eax
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cmpl $(0x8000ffff-0x80000001), %eax
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ja enable_paging
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/* Clear bogus XD_DISABLE bits */
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call verify_cpu
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mov $0x80000001, %eax
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cpuid
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/* Execute Disable bit supported? */
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btl $(X86_FEATURE_NX & 31), %edx
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jnc enable_paging
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/* Setup EFER (Extended Feature Enable Register) */
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movl $MSR_EFER, %ecx
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rdmsr
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btsl $_EFER_NX, %eax
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/* Make changes effective */
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wrmsr
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enable_paging:
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/*
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* Enable paging
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*/
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movl $pa(initial_page_table), %eax
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movl %eax,%cr3 /* set the page table pointer.. */
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movl $CR0_STATE,%eax
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movl %eax,%cr0 /* ..and set paging (PG) bit */
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ljmp $__BOOT_CS,$1f /* Clear prefetch and normalize %eip */
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1:
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/* Shift the stack pointer to a virtual address */
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addl $__PAGE_OFFSET, %esp
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/*
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* start system 32-bit setup. We need to re-do some of the things done
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* in 16-bit mode for the "real" operations.
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*/
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movl setup_once_ref,%eax
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andl %eax,%eax
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jz 1f # Did we do this already?
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call *%eax
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1:
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/*
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* Check if it is 486
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*/
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movb $4,X86 # at least 486
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cmpl $-1,X86_CPUID
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je is486
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/* get vendor info */
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xorl %eax,%eax # call CPUID with 0 -> return vendor ID
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cpuid
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movl %eax,X86_CPUID # save CPUID level
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movl %ebx,X86_VENDOR_ID # lo 4 chars
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movl %edx,X86_VENDOR_ID+4 # next 4 chars
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movl %ecx,X86_VENDOR_ID+8 # last 4 chars
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orl %eax,%eax # do we have processor info as well?
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je is486
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movl $1,%eax # Use the CPUID instruction to get CPU type
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cpuid
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movb %al,%cl # save reg for future use
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andb $0x0f,%ah # mask processor family
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movb %ah,X86
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andb $0xf0,%al # mask model
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shrb $4,%al
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movb %al,X86_MODEL
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andb $0x0f,%cl # mask mask revision
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movb %cl,X86_MASK
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movl %edx,X86_CAPABILITY
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is486:
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movl $0x50022,%ecx # set AM, WP, NE and MP
|
|
movl %cr0,%eax
|
|
andl $0x80000011,%eax # Save PG,PE,ET
|
|
orl %ecx,%eax
|
|
movl %eax,%cr0
|
|
|
|
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 $(__USER_DS),%eax # DS/ES contains default USER segment
|
|
movl %eax,%ds
|
|
movl %eax,%es
|
|
|
|
movl $(__KERNEL_PERCPU), %eax
|
|
movl %eax,%fs # set this cpu's percpu
|
|
|
|
movl $(__KERNEL_STACK_CANARY),%eax
|
|
movl %eax,%gs
|
|
|
|
xorl %eax,%eax # Clear LDT
|
|
lldt %ax
|
|
|
|
pushl $0 # fake return address for unwinder
|
|
jmp *(initial_code)
|
|
|
|
#include "verify_cpu.S"
|
|
|
|
/*
|
|
* setup_once
|
|
*
|
|
* The setup work we only want to run on the BSP.
|
|
*
|
|
* Warning: %esi is live across this function.
|
|
*/
|
|
__INIT
|
|
setup_once:
|
|
/*
|
|
* Set up a idt with 256 interrupt gates that push zero if there
|
|
* is no error code and then jump to early_idt_handler_common.
|
|
* It doesn't actually load the idt - that needs to be done on
|
|
* each CPU. Interrupts are enabled elsewhere, when we can be
|
|
* relatively sure everything is ok.
|
|
*/
|
|
|
|
movl $idt_table,%edi
|
|
movl $early_idt_handler_array,%eax
|
|
movl $NUM_EXCEPTION_VECTORS,%ecx
|
|
1:
|
|
movl %eax,(%edi)
|
|
movl %eax,4(%edi)
|
|
/* interrupt gate, dpl=0, present */
|
|
movl $(0x8E000000 + __KERNEL_CS),2(%edi)
|
|
addl $EARLY_IDT_HANDLER_SIZE,%eax
|
|
addl $8,%edi
|
|
loop 1b
|
|
|
|
movl $256 - NUM_EXCEPTION_VECTORS,%ecx
|
|
movl $ignore_int,%edx
|
|
movl $(__KERNEL_CS << 16),%eax
|
|
movw %dx,%ax /* selector = 0x0010 = cs */
|
|
movw $0x8E00,%dx /* interrupt gate - dpl=0, present */
|
|
2:
|
|
movl %eax,(%edi)
|
|
movl %edx,4(%edi)
|
|
addl $8,%edi
|
|
loop 2b
|
|
|
|
#ifdef CONFIG_CC_STACKPROTECTOR
|
|
/*
|
|
* Configure the stack canary. The linker can't handle this by
|
|
* relocation. Manually set base address in stack canary
|
|
* segment descriptor.
|
|
*/
|
|
movl $gdt_page,%eax
|
|
movl $stack_canary,%ecx
|
|
movw %cx, 8 * GDT_ENTRY_STACK_CANARY + 2(%eax)
|
|
shrl $16, %ecx
|
|
movb %cl, 8 * GDT_ENTRY_STACK_CANARY + 4(%eax)
|
|
movb %ch, 8 * GDT_ENTRY_STACK_CANARY + 7(%eax)
|
|
#endif
|
|
|
|
andl $0,setup_once_ref /* Once is enough, thanks */
|
|
ret
|
|
|
|
ENTRY(early_idt_handler_array)
|
|
# 36(%esp) %eflags
|
|
# 32(%esp) %cs
|
|
# 28(%esp) %eip
|
|
# 24(%rsp) error code
|
|
i = 0
|
|
.rept NUM_EXCEPTION_VECTORS
|
|
.ifeq (EXCEPTION_ERRCODE_MASK >> i) & 1
|
|
pushl $0 # Dummy error code, to make stack frame uniform
|
|
.endif
|
|
pushl $i # 20(%esp) Vector number
|
|
jmp early_idt_handler_common
|
|
i = i + 1
|
|
.fill early_idt_handler_array + i*EARLY_IDT_HANDLER_SIZE - ., 1, 0xcc
|
|
.endr
|
|
ENDPROC(early_idt_handler_array)
|
|
|
|
early_idt_handler_common:
|
|
/*
|
|
* The stack is the hardware frame, an error code or zero, and the
|
|
* vector number.
|
|
*/
|
|
cld
|
|
|
|
cmpl $2,(%esp) # X86_TRAP_NMI
|
|
je .Lis_nmi # Ignore NMI
|
|
|
|
cmpl $2,%ss:early_recursion_flag
|
|
je hlt_loop
|
|
incl %ss:early_recursion_flag
|
|
|
|
push %eax # 16(%esp)
|
|
push %ecx # 12(%esp)
|
|
push %edx # 8(%esp)
|
|
push %ds # 4(%esp)
|
|
push %es # 0(%esp)
|
|
movl $(__KERNEL_DS),%eax
|
|
movl %eax,%ds
|
|
movl %eax,%es
|
|
|
|
cmpl $(__KERNEL_CS),32(%esp)
|
|
jne 10f
|
|
|
|
leal 28(%esp),%eax # Pointer to %eip
|
|
call early_fixup_exception
|
|
andl %eax,%eax
|
|
jnz ex_entry /* found an exception entry */
|
|
|
|
10:
|
|
#ifdef CONFIG_PRINTK
|
|
xorl %eax,%eax
|
|
movw %ax,2(%esp) /* clean up the segment values on some cpus */
|
|
movw %ax,6(%esp)
|
|
movw %ax,34(%esp)
|
|
leal 40(%esp),%eax
|
|
pushl %eax /* %esp before the exception */
|
|
pushl %ebx
|
|
pushl %ebp
|
|
pushl %esi
|
|
pushl %edi
|
|
movl %cr2,%eax
|
|
pushl %eax
|
|
pushl (20+6*4)(%esp) /* trapno */
|
|
pushl $fault_msg
|
|
call printk
|
|
#endif
|
|
call dump_stack
|
|
hlt_loop:
|
|
hlt
|
|
jmp hlt_loop
|
|
|
|
ex_entry:
|
|
pop %es
|
|
pop %ds
|
|
pop %edx
|
|
pop %ecx
|
|
pop %eax
|
|
decl %ss:early_recursion_flag
|
|
.Lis_nmi:
|
|
addl $8,%esp /* drop vector number and error code */
|
|
iret
|
|
ENDPROC(early_idt_handler_common)
|
|
|
|
/* 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
|
|
call printk
|
|
|
|
call dump_stack
|
|
|
|
addl $(5*4),%esp
|
|
popl %ds
|
|
popl %es
|
|
popl %edx
|
|
popl %ecx
|
|
popl %eax
|
|
#endif
|
|
iret
|
|
ENDPROC(ignore_int)
|
|
__INITDATA
|
|
.align 4
|
|
early_recursion_flag:
|
|
.long 0
|
|
|
|
__REFDATA
|
|
.align 4
|
|
ENTRY(initial_code)
|
|
.long i386_start_kernel
|
|
ENTRY(setup_once_ref)
|
|
.long setup_once
|
|
|
|
/*
|
|
* BSS section
|
|
*/
|
|
__PAGE_ALIGNED_BSS
|
|
.align PAGE_SIZE
|
|
#ifdef CONFIG_X86_PAE
|
|
initial_pg_pmd:
|
|
.fill 1024*KPMDS,4,0
|
|
#else
|
|
ENTRY(initial_page_table)
|
|
.fill 1024,4,0
|
|
#endif
|
|
initial_pg_fixmap:
|
|
.fill 1024,4,0
|
|
ENTRY(empty_zero_page)
|
|
.fill 4096,1,0
|
|
ENTRY(swapper_pg_dir)
|
|
.fill 1024,4,0
|
|
|
|
/*
|
|
* This starts the data section.
|
|
*/
|
|
#ifdef CONFIG_X86_PAE
|
|
__PAGE_ALIGNED_DATA
|
|
/* Page-aligned for the benefit of paravirt? */
|
|
.align PAGE_SIZE
|
|
ENTRY(initial_page_table)
|
|
.long pa(initial_pg_pmd+PGD_IDENT_ATTR),0 /* low identity map */
|
|
# if KPMDS == 3
|
|
.long pa(initial_pg_pmd+PGD_IDENT_ATTR),0
|
|
.long pa(initial_pg_pmd+PGD_IDENT_ATTR+0x1000),0
|
|
.long pa(initial_pg_pmd+PGD_IDENT_ATTR+0x2000),0
|
|
# elif KPMDS == 2
|
|
.long 0,0
|
|
.long pa(initial_pg_pmd+PGD_IDENT_ATTR),0
|
|
.long pa(initial_pg_pmd+PGD_IDENT_ATTR+0x1000),0
|
|
# elif KPMDS == 1
|
|
.long 0,0
|
|
.long 0,0
|
|
.long pa(initial_pg_pmd+PGD_IDENT_ATTR),0
|
|
# else
|
|
# error "Kernel PMDs should be 1, 2 or 3"
|
|
# endif
|
|
.align PAGE_SIZE /* needs to be page-sized too */
|
|
#endif
|
|
|
|
.data
|
|
.balign 4
|
|
ENTRY(stack_start)
|
|
.long init_thread_union+THREAD_SIZE
|
|
|
|
__INITRODATA
|
|
int_msg:
|
|
.asciz "Unknown interrupt or fault at: %p %p %p\n"
|
|
|
|
fault_msg:
|
|
/* fault info: */
|
|
.ascii "BUG: Int %d: CR2 %p\n"
|
|
/* regs pushed in early_idt_handler: */
|
|
.ascii " EDI %p ESI %p EBP %p EBX %p\n"
|
|
.ascii " ESP %p ES %p DS %p\n"
|
|
.ascii " EDX %p ECX %p EAX %p\n"
|
|
/* fault frame: */
|
|
.ascii " vec %p 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:
|
|
*/
|
|
|
|
.data
|
|
.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 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 */
|