mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
63e7b6d90c
The temp fixed area is only used during boot for early_ioremap(), and it is unused when ioremap() is functional. vmalloc/pkmap area become available after early boot so the temp fixed area is available for re-use. The virtual address is more precious on i386, especially turning on high memory. So we can re-use the virtual address space. Remove the now unused defines FIXADDR_BOOT_START and FIXADDR_BOOT_SIZE. Signed-off-by: Minfei Huang <mnfhuang@gmail.com> Cc: pbonzini@redhat.com Cc: bp@suse.de Link: http://lkml.kernel.org/r/1414582717-32729-1-git-send-email-mnfhuang@gmail.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
#ifndef _ASM_X86_PGTABLE_32_DEFS_H
|
|
#define _ASM_X86_PGTABLE_32_DEFS_H
|
|
|
|
/*
|
|
* The Linux x86 paging architecture is 'compile-time dual-mode', it
|
|
* implements both the traditional 2-level x86 page tables and the
|
|
* newer 3-level PAE-mode page tables.
|
|
*/
|
|
#ifdef CONFIG_X86_PAE
|
|
# include <asm/pgtable-3level_types.h>
|
|
# define PMD_SIZE (1UL << PMD_SHIFT)
|
|
# define PMD_MASK (~(PMD_SIZE - 1))
|
|
#else
|
|
# include <asm/pgtable-2level_types.h>
|
|
#endif
|
|
|
|
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
|
|
#define PGDIR_MASK (~(PGDIR_SIZE - 1))
|
|
|
|
/* Just any arbitrary offset to the start of the vmalloc VM area: the
|
|
* current 8MB value just means that there will be a 8MB "hole" after the
|
|
* physical memory until the kernel virtual memory starts. That means that
|
|
* any out-of-bounds memory accesses will hopefully be caught.
|
|
* The vmalloc() routines leaves a hole of 4kB between each vmalloced
|
|
* area for the same reason. ;)
|
|
*/
|
|
#define VMALLOC_OFFSET (8 * 1024 * 1024)
|
|
|
|
#ifndef __ASSEMBLY__
|
|
extern bool __vmalloc_start_set; /* set once high_memory is set */
|
|
#endif
|
|
|
|
#define VMALLOC_START ((unsigned long)high_memory + VMALLOC_OFFSET)
|
|
#ifdef CONFIG_X86_PAE
|
|
#define LAST_PKMAP 512
|
|
#else
|
|
#define LAST_PKMAP 1024
|
|
#endif
|
|
|
|
#define PKMAP_BASE ((FIXADDR_START - PAGE_SIZE * (LAST_PKMAP + 1)) \
|
|
& PMD_MASK)
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
# define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE)
|
|
#else
|
|
# define VMALLOC_END (FIXADDR_START - 2 * PAGE_SIZE)
|
|
#endif
|
|
|
|
#define MODULES_VADDR VMALLOC_START
|
|
#define MODULES_END VMALLOC_END
|
|
#define MODULES_LEN (MODULES_VADDR - MODULES_END)
|
|
|
|
#define MAXMEM (VMALLOC_END - PAGE_OFFSET - __VMALLOC_RESERVE)
|
|
|
|
#endif /* _ASM_X86_PGTABLE_32_DEFS_H */
|