mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
186525bd6b
- Untangle the somewhat incestous way of how VMALLOC_START is used all across the
kernel, but is, on x86, defined deep inside one of the lowest level page table headers.
It doesn't help that vmalloc.h only includes a single asm header:
#include <asm/page.h> /* pgprot_t */
So there was no existing cross-arch way to decouple address layout
definitions from page.h details. I used this:
#ifndef VMALLOC_START
# include <asm/vmalloc.h>
#endif
This way every architecture that wants to simplify page.h can do so.
- Also on x86 we had a couple of LDT related inline functions that used
the late-stage address space layout positions - but these could be
uninlined without real trouble - the end result is cleaner this way as
well.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
#ifndef _ASM_X86_PGTABLE_32_AREAS_H
|
|
#define _ASM_X86_PGTABLE_32_AREAS_H
|
|
|
|
#include <asm/cpu_entry_area.h>
|
|
|
|
/*
|
|
* 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 CPU_ENTRY_AREA_PAGES (NR_CPUS * DIV_ROUND_UP(sizeof(struct cpu_entry_area), PAGE_SIZE))
|
|
|
|
/* The +1 is for the readonly IDT page: */
|
|
#define CPU_ENTRY_AREA_BASE \
|
|
((FIXADDR_TOT_START - PAGE_SIZE*(CPU_ENTRY_AREA_PAGES+1)) & PMD_MASK)
|
|
|
|
#define LDT_BASE_ADDR \
|
|
((CPU_ENTRY_AREA_BASE - PAGE_SIZE) & PMD_MASK)
|
|
|
|
#define LDT_END_ADDR (LDT_BASE_ADDR + PMD_SIZE)
|
|
|
|
#define PKMAP_BASE \
|
|
((LDT_BASE_ADDR - PAGE_SIZE) & PMD_MASK)
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
# define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE)
|
|
#else
|
|
# define VMALLOC_END (LDT_BASE_ADDR - 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_AREAS_H */
|