mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 07:26:16 +07:00
7c360572b4
The value (once we initialize it) is a foregone conclusion. Make it a #define to save a tiny amount of text and data size and to make it more comprehensible. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Pavel Machek <pavel@ucw.cz> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephen Smalley <sds@tycho.nsa.gov> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/0850eb0213de9da88544ff7fae72dc6d06d2b441.1453239349.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
166 lines
4.7 KiB
C
166 lines
4.7 KiB
C
/*
|
|
* 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
|
|
*/
|
|
|
|
#ifndef _ASM_X86_FIXMAP_H
|
|
#define _ASM_X86_FIXMAP_H
|
|
|
|
#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 <uapi/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)
|
|
#else
|
|
#define FIXADDR_TOP (round_up(VSYSCALL_ADDR + PAGE_SIZE, 1<<PMD_SHIFT) - \
|
|
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 4k 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 {
|
|
#ifdef CONFIG_X86_32
|
|
FIX_HOLE,
|
|
#else
|
|
#ifdef CONFIG_X86_VSYSCALL_EMULATION
|
|
VSYSCALL_PAGE = (FIXADDR_TOP - VSYSCALL_ADDR) >> PAGE_SHIFT,
|
|
#endif
|
|
#endif
|
|
FIX_DBGP_BASE,
|
|
FIX_EARLYCON_MEM_BASE,
|
|
#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
|
|
FIX_OHCI1394_BASE,
|
|
#endif
|
|
#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
|
|
FIX_RO_IDT, /* Virtual mapping for read-only IDT */
|
|
#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
|
|
FIX_TEXT_POKE1, /* reserve 2 pages for text_poke() */
|
|
FIX_TEXT_POKE0, /* first page is last, because allocation is backward */
|
|
#ifdef CONFIG_X86_INTEL_MID
|
|
FIX_LNW_VRTC,
|
|
#endif
|
|
__end_of_permanent_fixed_addresses,
|
|
|
|
/*
|
|
* 512 temporary boot-time mappings, used by early_ioremap(),
|
|
* before ioremap() is functional.
|
|
*
|
|
* If necessary we round it up to the next 512 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 8
|
|
#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
|
|
FIX_BTMAP_END =
|
|
(__end_of_permanent_fixed_addresses ^
|
|
(__end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS - 1)) &
|
|
-PTRS_PER_PTE
|
|
? __end_of_permanent_fixed_addresses + TOTAL_FIX_BTMAPS -
|
|
(__end_of_permanent_fixed_addresses & (TOTAL_FIX_BTMAPS - 1))
|
|
: __end_of_permanent_fixed_addresses,
|
|
FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
|
|
#ifdef CONFIG_X86_32
|
|
FIX_WP_TEST,
|
|
#endif
|
|
#ifdef CONFIG_INTEL_TXT
|
|
FIX_TBOOT_BASE,
|
|
#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_START (FIXADDR_TOP - FIXADDR_SIZE)
|
|
|
|
extern int fixmaps_set;
|
|
|
|
extern pte_t *kmap_pte;
|
|
#define kmap_prot PAGE_KERNEL
|
|
extern pte_t *pkmap_page_table;
|
|
|
|
void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
|
|
void native_set_fixmap(enum fixed_addresses idx,
|
|
phys_addr_t phys, pgprot_t flags);
|
|
|
|
#ifndef CONFIG_PARAVIRT
|
|
static inline void __set_fixmap(enum fixed_addresses idx,
|
|
phys_addr_t phys, pgprot_t flags)
|
|
{
|
|
native_set_fixmap(idx, phys, flags);
|
|
}
|
|
#endif
|
|
|
|
#include <asm-generic/fixmap.h>
|
|
|
|
#define __late_set_fixmap(idx, phys, flags) __set_fixmap(idx, phys, flags)
|
|
#define __late_clear_fixmap(idx) __set_fixmap(idx, 0, __pgprot(0))
|
|
|
|
void __early_set_fixmap(enum fixed_addresses idx,
|
|
phys_addr_t phys, pgprot_t flags);
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
#endif /* _ASM_X86_FIXMAP_H */
|