181 lines
5.1 KiB
C
181 lines
5.1 KiB
C
#ifndef __XEN_PAGE_H
|
|
#define __XEN_PAGE_H
|
|
|
|
#include <linux/pfn.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
#include <xen/features.h>
|
|
|
|
#ifdef CONFIG_X86_PAE
|
|
/* Xen machine address */
|
|
typedef struct xmaddr {
|
|
unsigned long long maddr;
|
|
} xmaddr_t;
|
|
|
|
/* Xen pseudo-physical address */
|
|
typedef struct xpaddr {
|
|
unsigned long long paddr;
|
|
} xpaddr_t;
|
|
#else
|
|
/* Xen machine address */
|
|
typedef struct xmaddr {
|
|
unsigned long maddr;
|
|
} xmaddr_t;
|
|
|
|
/* Xen pseudo-physical address */
|
|
typedef struct xpaddr {
|
|
unsigned long paddr;
|
|
} xpaddr_t;
|
|
#endif
|
|
|
|
#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
|
|
#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
|
|
|
|
/**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/
|
|
#define INVALID_P2M_ENTRY (~0UL)
|
|
#define FOREIGN_FRAME_BIT (1UL<<31)
|
|
#define FOREIGN_FRAME(m) ((m) | FOREIGN_FRAME_BIT)
|
|
|
|
extern unsigned long *phys_to_machine_mapping;
|
|
|
|
static inline unsigned long pfn_to_mfn(unsigned long pfn)
|
|
{
|
|
if (xen_feature(XENFEAT_auto_translated_physmap))
|
|
return pfn;
|
|
|
|
return phys_to_machine_mapping[(unsigned int)(pfn)] &
|
|
~FOREIGN_FRAME_BIT;
|
|
}
|
|
|
|
static inline int phys_to_machine_mapping_valid(unsigned long pfn)
|
|
{
|
|
if (xen_feature(XENFEAT_auto_translated_physmap))
|
|
return 1;
|
|
|
|
return (phys_to_machine_mapping[pfn] != INVALID_P2M_ENTRY);
|
|
}
|
|
|
|
static inline unsigned long mfn_to_pfn(unsigned long mfn)
|
|
{
|
|
unsigned long pfn;
|
|
|
|
if (xen_feature(XENFEAT_auto_translated_physmap))
|
|
return mfn;
|
|
|
|
#if 0
|
|
if (unlikely((mfn >> machine_to_phys_order) != 0))
|
|
return max_mapnr;
|
|
#endif
|
|
|
|
pfn = 0;
|
|
/*
|
|
* The array access can fail (e.g., device space beyond end of RAM).
|
|
* In such cases it doesn't matter what we return (we return garbage),
|
|
* but we must handle the fault without crashing!
|
|
*/
|
|
__get_user(pfn, &machine_to_phys_mapping[mfn]);
|
|
|
|
return pfn;
|
|
}
|
|
|
|
static inline xmaddr_t phys_to_machine(xpaddr_t phys)
|
|
{
|
|
unsigned offset = phys.paddr & ~PAGE_MASK;
|
|
return XMADDR(PFN_PHYS((u64)pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
|
|
}
|
|
|
|
static inline xpaddr_t machine_to_phys(xmaddr_t machine)
|
|
{
|
|
unsigned offset = machine.maddr & ~PAGE_MASK;
|
|
return XPADDR(PFN_PHYS((u64)mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
|
|
}
|
|
|
|
/*
|
|
* We detect special mappings in one of two ways:
|
|
* 1. If the MFN is an I/O page then Xen will set the m2p entry
|
|
* to be outside our maximum possible pseudophys range.
|
|
* 2. If the MFN belongs to a different domain then we will certainly
|
|
* not have MFN in our p2m table. Conversely, if the page is ours,
|
|
* then we'll have p2m(m2p(MFN))==MFN.
|
|
* If we detect a special mapping then it doesn't have a 'struct page'.
|
|
* We force !pfn_valid() by returning an out-of-range pointer.
|
|
*
|
|
* NB. These checks require that, for any MFN that is not in our reservation,
|
|
* there is no PFN such that p2m(PFN) == MFN. Otherwise we can get confused if
|
|
* we are foreign-mapping the MFN, and the other domain as m2p(MFN) == PFN.
|
|
* Yikes! Various places must poke in INVALID_P2M_ENTRY for safety.
|
|
*
|
|
* NB2. When deliberately mapping foreign pages into the p2m table, you *must*
|
|
* use FOREIGN_FRAME(). This will cause pte_pfn() to choke on it, as we
|
|
* require. In all the cases we care about, the FOREIGN_FRAME bit is
|
|
* masked (e.g., pfn_to_mfn()) so behaviour there is correct.
|
|
*/
|
|
static inline unsigned long mfn_to_local_pfn(unsigned long mfn)
|
|
{
|
|
extern unsigned long max_mapnr;
|
|
unsigned long pfn = mfn_to_pfn(mfn);
|
|
if ((pfn < max_mapnr)
|
|
&& !xen_feature(XENFEAT_auto_translated_physmap)
|
|
&& (phys_to_machine_mapping[pfn] != mfn))
|
|
return max_mapnr; /* force !pfn_valid() */
|
|
return pfn;
|
|
}
|
|
|
|
static inline void set_phys_to_machine(unsigned long pfn, unsigned long mfn)
|
|
{
|
|
if (xen_feature(XENFEAT_auto_translated_physmap)) {
|
|
BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY);
|
|
return;
|
|
}
|
|
phys_to_machine_mapping[pfn] = mfn;
|
|
}
|
|
|
|
/* VIRT <-> MACHINE conversion */
|
|
#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v))))
|
|
#define virt_to_mfn(v) (pfn_to_mfn(PFN_DOWN(__pa(v))))
|
|
#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
|
|
|
|
#ifdef CONFIG_X86_PAE
|
|
#define pte_mfn(_pte) (((_pte).pte_low >> PAGE_SHIFT) | \
|
|
(((_pte).pte_high & 0xfff) << (32-PAGE_SHIFT)))
|
|
|
|
static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot)
|
|
{
|
|
pte_t pte;
|
|
|
|
pte.pte_high = (page_nr >> (32 - PAGE_SHIFT)) |
|
|
(pgprot_val(pgprot) >> 32);
|
|
pte.pte_high &= (__supported_pte_mask >> 32);
|
|
pte.pte_low = ((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));
|
|
pte.pte_low &= __supported_pte_mask;
|
|
|
|
return pte;
|
|
}
|
|
|
|
static inline unsigned long long pte_val_ma(pte_t x)
|
|
{
|
|
return x.pte;
|
|
}
|
|
#define pmd_val_ma(v) ((v).pmd)
|
|
#define pud_val_ma(v) ((v).pgd.pgd)
|
|
#define __pte_ma(x) ((pte_t) { .pte = (x) })
|
|
#define __pmd_ma(x) ((pmd_t) { (x) } )
|
|
#else /* !X86_PAE */
|
|
#define pte_mfn(_pte) ((_pte).pte_low >> PAGE_SHIFT)
|
|
#define mfn_pte(pfn, prot) __pte_ma(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
|
|
#define pte_val_ma(x) ((x).pte)
|
|
#define pmd_val_ma(v) ((v).pud.pgd.pgd)
|
|
#define __pte_ma(x) ((pte_t) { (x) } )
|
|
#endif /* CONFIG_X86_PAE */
|
|
|
|
#define pgd_val_ma(x) ((x).pgd)
|
|
|
|
|
|
xmaddr_t arbitrary_virt_to_machine(unsigned long address);
|
|
void make_lowmem_page_readonly(void *vaddr);
|
|
void make_lowmem_page_readwrite(void *vaddr);
|
|
|
|
#endif /* __XEN_PAGE_H */
|