forked from Minki/linux
bdab225015
* git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-mn10300: (44 commits) MN10300: Save frame pointer in thread_info struct rather than global var MN10300: Change "Matsushita" to "Panasonic". MN10300: Create a defconfig for the ASB2364 board MN10300: Update the ASB2303 defconfig MN10300: ASB2364: Add support for SMSC911X and SMC911X MN10300: ASB2364: Handle the IRQ multiplexer in the FPGA MN10300: Generic time support MN10300: Specify an ELF HWCAP flag for MN10300 Atomic Operations Unit support MN10300: Map userspace atomic op regs as a vmalloc page MN10300: And Panasonic AM34 subarch and implement SMP MN10300: Delete idle_timestamp from irq_cpustat_t MN10300: Make various interrupt priority settings configurable MN10300: Optimise do_csum() MN10300: Implement atomic ops using atomic ops unit MN10300: Make the FPU operate in non-lazy mode under SMP MN10300: SMP TLB flushing MN10300: Use the [ID]PTEL2 registers rather than [ID]PTEL for TLB control MN10300: Make the use of PIDR to mark TLB entries controllable MN10300: Rename __flush_tlb*() to local_flush_tlb*() MN10300: AM34 erratum requires MMUCTR read and write on exception entry ...
129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
/* MN10300 Virtual kernel memory mappings for high memory
|
|
*
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
* - Derived from include/asm-i386/highmem.h
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
#ifndef _ASM_HIGHMEM_H
|
|
#define _ASM_HIGHMEM_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/highmem.h>
|
|
#include <asm/kmap_types.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
/* undef for production */
|
|
#undef HIGHMEM_DEBUG
|
|
|
|
/* declarations for highmem.c */
|
|
extern unsigned long highstart_pfn, highend_pfn;
|
|
|
|
extern pte_t *kmap_pte;
|
|
extern pgprot_t kmap_prot;
|
|
extern pte_t *pkmap_page_table;
|
|
|
|
extern void __init kmap_init(void);
|
|
|
|
/*
|
|
* Right now we initialize only a single pte table. It can be extended
|
|
* easily, subsequent pte tables have to be allocated in one physical
|
|
* chunk of RAM.
|
|
*/
|
|
#define PKMAP_BASE 0xfe000000UL
|
|
#define LAST_PKMAP 1024
|
|
#define LAST_PKMAP_MASK (LAST_PKMAP - 1)
|
|
#define PKMAP_NR(virt) ((virt - PKMAP_BASE) >> PAGE_SHIFT)
|
|
#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT))
|
|
|
|
extern unsigned long kmap_high(struct page *page);
|
|
extern void kunmap_high(struct page *page);
|
|
|
|
static inline unsigned long kmap(struct page *page)
|
|
{
|
|
if (in_interrupt())
|
|
BUG();
|
|
if (page < highmem_start_page)
|
|
return page_address(page);
|
|
return kmap_high(page);
|
|
}
|
|
|
|
static inline void kunmap(struct page *page)
|
|
{
|
|
if (in_interrupt())
|
|
BUG();
|
|
if (page < highmem_start_page)
|
|
return;
|
|
kunmap_high(page);
|
|
}
|
|
|
|
/*
|
|
* The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
|
|
* gives a more generic (and caching) interface. But kmap_atomic can
|
|
* be used in IRQ contexts, so in some (very limited) cases we need
|
|
* it.
|
|
*/
|
|
static inline unsigned long __kmap_atomic(struct page *page)
|
|
{
|
|
unsigned long vaddr;
|
|
int idx, type;
|
|
|
|
pagefault_disable();
|
|
if (page < highmem_start_page)
|
|
return page_address(page);
|
|
|
|
type = kmap_atomic_idx_push();
|
|
idx = type + KM_TYPE_NR * smp_processor_id();
|
|
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
|
|
#if HIGHMEM_DEBUG
|
|
if (!pte_none(*(kmap_pte - idx)))
|
|
BUG();
|
|
#endif
|
|
set_pte(kmap_pte - idx, mk_pte(page, kmap_prot));
|
|
local_flush_tlb_one(vaddr);
|
|
|
|
return vaddr;
|
|
}
|
|
|
|
static inline void __kunmap_atomic(unsigned long vaddr)
|
|
{
|
|
int type;
|
|
|
|
if (vaddr < FIXADDR_START) { /* FIXME */
|
|
pagefault_enable();
|
|
return;
|
|
}
|
|
|
|
type = kmap_atomic_idx();
|
|
|
|
#if HIGHMEM_DEBUG
|
|
{
|
|
unsigned int idx;
|
|
idx = type + KM_TYPE_NR * smp_processor_id();
|
|
|
|
if (vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx))
|
|
BUG();
|
|
|
|
/*
|
|
* force other mappings to Oops if they'll try to access
|
|
* this pte without first remap it
|
|
*/
|
|
pte_clear(kmap_pte - idx);
|
|
local_flush_tlb_one(vaddr);
|
|
}
|
|
#endif
|
|
|
|
kmap_atomic_idx_pop();
|
|
pagefault_enable();
|
|
}
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _ASM_HIGHMEM_H */
|