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/*
* fixmap . h : compile - time virtual memory allocation
*
* This file is subject to the terms and conditions of the GNU General Public
* License . See the file " COPYING " in the main directory of this archive
* for more details .
*
* Copyright ( C ) 1998 Ingo Molnar
*
* Support of BIGMEM added by Gerhard Wichert , Siemens AG , July 1999
* x86_32 and x86_64 integration by Gustavo F . Padovan , February 2009
*/
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# ifndef _ASM_X86_FIXMAP_H
# define _ASM_X86_FIXMAP_H
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# ifndef __ASSEMBLY__
# include <linux/kernel.h>
# include <asm/acpi.h>
# include <asm/apicdef.h>
# include <asm/page.h>
# ifdef CONFIG_X86_32
# include <linux/threads.h>
# include <asm/kmap_types.h>
# else
# include <asm/vsyscall.h>
# endif
/*
* We can ' t declare FIXADDR_TOP as variable for x86_64 because vsyscall
* uses fixmaps that relies on FIXADDR_TOP for proper address calculation .
* Because of this , FIXADDR_TOP x86 integration was left as later work .
*/
# ifdef CONFIG_X86_32
/* used by vmalloc.c, vsyscall.lds.S.
*
* Leave one empty page between vmalloc ' ed areas and
* the start of the fixmap .
*/
extern unsigned long __FIXADDR_TOP ;
# define FIXADDR_TOP ((unsigned long)__FIXADDR_TOP)
# define FIXADDR_USER_START __fix_to_virt(FIX_VDSO)
# define FIXADDR_USER_END __fix_to_virt(FIX_VDSO - 1)
# else
# define FIXADDR_TOP (VSYSCALL_END-PAGE_SIZE)
/* Only covers 32bit vsyscalls currently. Need another set for 64bit. */
# define FIXADDR_USER_START ((unsigned long)VSYSCALL32_VSYSCALL)
# define FIXADDR_USER_END (FIXADDR_USER_START + PAGE_SIZE)
# endif
/*
* Here we define all the compile - time ' special ' virtual
* addresses . The point is to have a constant address at
* compile time , but to set the physical address only
* in the boot process .
* for x86_32 : We allocate these special addresses
* from the end of virtual memory ( 0xfffff000 ) backwards .
* Also this lets us do fail - safe vmalloc ( ) , we
* can guarantee that these special addresses and
* vmalloc ( ) - ed addresses never overlap .
*
* These ' compile - time allocated ' memory buffers are
* fixed - size 4 k pages ( or larger if used with an increment
* higher than 1 ) . Use set_fixmap ( idx , phys ) to associate
* physical memory with fixmap indices .
*
* TLB entries of such buffers will not be flushed across
* task switches .
*/
enum fixed_addresses {
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# ifdef CONFIG_X86_32
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FIX_HOLE ,
FIX_VDSO ,
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# else
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VSYSCALL_LAST_PAGE ,
VSYSCALL_FIRST_PAGE = VSYSCALL_LAST_PAGE
+ ( ( VSYSCALL_END - VSYSCALL_START ) > > PAGE_SHIFT ) - 1 ,
VSYSCALL_HPET ,
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# endif
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FIX_DBGP_BASE ,
FIX_EARLYCON_MEM_BASE ,
# ifdef CONFIG_X86_LOCAL_APIC
FIX_APIC_BASE , /* local (CPU) APIC) -- required for SMP or not */
# endif
# ifdef CONFIG_X86_IO_APIC
FIX_IO_APIC_BASE_0 ,
FIX_IO_APIC_BASE_END = FIX_IO_APIC_BASE_0 + MAX_IO_APICS - 1 ,
# endif
# ifdef CONFIG_X86_VISWS_APIC
FIX_CO_CPU , /* Cobalt timer */
FIX_CO_APIC , /* Cobalt APIC Redirection Table */
FIX_LI_PCIA , /* Lithium PCI Bridge A */
FIX_LI_PCIB , /* Lithium PCI Bridge B */
# endif
# ifdef CONFIG_X86_F00F_BUG
FIX_F00F_IDT , /* Virtual mapping for IDT */
# endif
# ifdef CONFIG_X86_CYCLONE_TIMER
FIX_CYCLONE_TIMER , /*cyclone timer register*/
# endif
# ifdef CONFIG_X86_32
FIX_KMAP_BEGIN , /* reserved pte's for temporary kernel mappings */
FIX_KMAP_END = FIX_KMAP_BEGIN + ( KM_TYPE_NR * NR_CPUS ) - 1 ,
# ifdef CONFIG_PCI_MMCONFIG
FIX_PCIE_MCFG ,
# endif
# endif
# ifdef CONFIG_PARAVIRT
FIX_PARAVIRT_BOOTMAP ,
# endif
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FIX_TEXT_POKE0 , /* reserve 2 pages for text_poke() */
FIX_TEXT_POKE1 ,
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__end_of_permanent_fixed_addresses ,
# ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
FIX_OHCI1394_BASE ,
# endif
/*
* 256 temporary boot - time mappings , used by early_ioremap ( ) ,
* before ioremap ( ) is functional .
*
* We round it up to the next 256 pages boundary so that we
* can have a single pgd entry and a single pte table :
*/
# define NR_FIX_BTMAPS 64
# define FIX_BTMAPS_SLOTS 4
FIX_BTMAP_END = __end_of_permanent_fixed_addresses + 256 -
( __end_of_permanent_fixed_addresses & 255 ) ,
FIX_BTMAP_BEGIN = FIX_BTMAP_END + NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS - 1 ,
# ifdef CONFIG_X86_32
FIX_WP_TEST ,
# endif
__end_of_fixed_addresses
} ;
extern void reserve_top_address ( unsigned long reserve ) ;
# define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
# define FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
# define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
# define FIXADDR_BOOT_START (FIXADDR_TOP - FIXADDR_BOOT_SIZE)
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extern int fixmaps_set ;
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extern pte_t * kmap_pte ;
extern pgprot_t kmap_prot ;
extern pte_t * pkmap_page_table ;
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void __native_set_fixmap ( enum fixed_addresses idx , pte_t pte ) ;
void native_set_fixmap ( enum fixed_addresses idx ,
unsigned long phys , pgprot_t flags ) ;
# ifndef CONFIG_PARAVIRT
static inline void __set_fixmap ( enum fixed_addresses idx ,
unsigned long phys , pgprot_t flags )
{
native_set_fixmap ( idx , phys , flags ) ;
}
# endif
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# define set_fixmap(idx, phys) \
__set_fixmap ( idx , phys , PAGE_KERNEL )
/*
* Some hardware wants to get fixmapped without caching .
*/
# define set_fixmap_nocache(idx, phys) \
__set_fixmap ( idx , phys , PAGE_KERNEL_NOCACHE )
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# define clear_fixmap(idx) \
__set_fixmap ( idx , 0 , __pgprot ( 0 ) )
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# define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
# define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
extern void __this_fixmap_does_not_exist ( void ) ;
/*
* ' index to address ' translation . If anyone tries to use the idx
* directly without translation , we catch the bug with a NULL - deference
* kernel oops . Illegal ranges of incoming indices are caught too .
*/
static __always_inline unsigned long fix_to_virt ( const unsigned int idx )
{
/*
* this branch gets completely eliminated after inlining ,
* except when someone tries to use fixaddr indices in an
* illegal way . ( such as mixing up address types or using
* out - of - range indices ) .
*
* If it doesn ' t get removed , the linker will complain
* loudly with a reasonably clear error message . .
*/
if ( idx > = __end_of_fixed_addresses )
__this_fixmap_does_not_exist ( ) ;
return __fix_to_virt ( idx ) ;
}
static inline unsigned long virt_to_fix ( const unsigned long vaddr )
{
BUG_ON ( vaddr > = FIXADDR_TOP | | vaddr < FIXADDR_START ) ;
return __virt_to_fix ( vaddr ) ;
}
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# endif /* !__ASSEMBLY__ */
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# endif /* _ASM_X86_FIXMAP_H */