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[Xen-merge] [PATCH 13/23] pgtable subarch headers

 

 

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chrisw at osdl

Aug 8, 2005, 12:02 AM

Post #1 of 1 (254 views)
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[Xen-merge] [PATCH 13/23] pgtable subarch headers

--- linux-2.6.12-xen0-arch.orig/include/asm-i386/pgtable.h
+++ linux-2.6.12-xen0-arch/include/asm-i386/pgtable.h
@@ -200,15 +200,6 @@ extern unsigned long long __PAGE_KERNEL,
/* The boot page tables (all created as a single array) */
extern unsigned long pg0[];

-#define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE))
-#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
-
-#define pmd_none(x) (!pmd_val(x))
-#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
-#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
-#define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
-
-
#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))

/*
@@ -237,6 +228,17 @@ static inline pte_t pte_mkdirty(pte_t pt
static inline pte_t pte_mkyoung(pte_t pte) { (pte).pte_low |= _PAGE_ACCESSED; return pte; }
static inline pte_t pte_mkwrite(pte_t pte) { (pte).pte_low |= _PAGE_RW; return pte; }

+#include <mach_pgtable.h>
+
+#define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE))
+#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
+
+#define pmd_none(x) (!pmd_val(x))
+#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
+#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
+#define pmd_bad(x) mach_pmd_bad(x)
+
+
#ifdef CONFIG_X86_PAE
# include <asm/pgtable-3level.h>
#else
@@ -257,10 +259,7 @@ static inline int ptep_test_and_clear_yo
return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte_low);
}

-static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
-{
- clear_bit(_PAGE_BIT_RW, &ptep->pte_low);
-}
+#define ptep_set_wrprotect(mm,addr,ptep) mach_ptep_set_wrprotect(mm,addr,ptep)

/*
* Macro to mark a page protection value as "uncacheable". On processors which do not support
@@ -363,9 +362,9 @@ extern void noexec_setup(const char *str

#if defined(CONFIG_HIGHPTE)
#define pte_offset_map(dir, address) \
- ((pte_t *)kmap_atomic(pmd_page(*(dir)),KM_PTE0) + pte_index(address))
+ ((pte_t *)kmap_atomic_pte(pmd_page(*(dir)),KM_PTE0) + pte_index(address))
#define pte_offset_map_nested(dir, address) \
- ((pte_t *)kmap_atomic(pmd_page(*(dir)),KM_PTE1) + pte_index(address))
+ ((pte_t *)kmap_atomic_pte(pmd_page(*(dir)),KM_PTE1) + pte_index(address))
#define pte_unmap(pte) kunmap_atomic(pte, KM_PTE0)
#define pte_unmap_nested(pte) kunmap_atomic(pte, KM_PTE1)
#else
@@ -403,10 +402,10 @@ extern void noexec_setup(const char *str
#endif /* !CONFIG_DISCONTIGMEM */

#define io_remap_page_range(vma, vaddr, paddr, size, prot) \
- remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
+ mach_io_remap_page_range(vma, vaddr, paddr, size, prot)

#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
- remap_pfn_range(vma, vaddr, pfn, size, prot)
+ mach_io_remap_pfn_range(vma, vaddr, pfn, size, prot)

#define MK_IOSPACE_PFN(space, pfn) (pfn)
#define GET_IOSPACE(pfn) 0
--- linux-2.6.12-xen0-arch.orig/include/asm-i386/pgtable-2level.h
+++ linux-2.6.12-xen0-arch/include/asm-i386/pgtable-2level.h
@@ -2,6 +2,7 @@
#define _I386_PGTABLE_2LEVEL_H

#include <asm-generic/pgtable-nopmd.h>
+#include <mach_pgtable-2level.h>

#define pte_ERROR(e) \
printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
@@ -16,13 +17,13 @@
#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
#define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
-#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
+#define set_pmd(pmdptr, pmdval) mach_set_pmd(pmdptr, pmdval)

-#define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte_low, 0))
+#define ptep_get_and_clear(mm,addr,xp) mach_ptep_get_and_clear(mm,addr,xp)
#define pte_same(a, b) ((a).pte_low == (b).pte_low)
-#define pte_page(x) pfn_to_page(pte_pfn(x))
+#define pte_page(x) mach_pte_page(x)
#define pte_none(x) (!(x).pte_low)
-#define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
+#define pte_pfn(x) mach_pte_pfn(x)
#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
#define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))

--- linux-2.6.12-xen0-arch.orig/include/asm-i386/pgtable-3level-defs.h
+++ linux-2.6.12-xen0-arch/include/asm-i386/pgtable-3level-defs.h
@@ -1,7 +1,7 @@
#ifndef _I386_PGTABLE_3LEVEL_DEFS_H
#define _I386_PGTABLE_3LEVEL_DEFS_H

-#define HAVE_SHARED_KERNEL_PMD 1
+#include <mach_pgtable-3level-defs.h>

/*
* PGDIR_SHIFT determines what a top-level page table entry can map
--- /dev/null
+++ linux-2.6.12-xen0-arch/include/asm-i386/mach-default/mach_pgtable.h
@@ -0,0 +1,18 @@
+#ifndef __ASM_MACH_PGTABLE_H
+#define __ASM_MACH_PGTABLE_H
+
+#define mach_pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
+#define mach_pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
+
+static inline void mach_ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+ clear_bit(_PAGE_BIT_RW, &ptep->pte_low);
+}
+
+#define mach_io_remap_page_range(vma, vaddr, paddr, size, prot) \
+ remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
+
+#define mach_io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
+ remap_pfn_range(vma, vaddr, pfn, size, prot)
+
+#endif
--- /dev/null
+++ linux-2.6.12-xen0-arch/include/asm-i386/mach-default/mach_pgtable-2level.h
@@ -0,0 +1,10 @@
+#ifndef _ASM_MACH_PGTABLE_2LEVEL_H
+#define _ASM_MACH_PGTABLE_2LEVEL_H
+
+#define mach_set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
+
+#define mach_ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte_low, 0))
+#define mach_pte_page(x) pfn_to_page(pte_pfn(x))
+#define mach_pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT)))
+
+#endif
--- /dev/null
+++ linux-2.6.12-xen0-arch/include/asm-i386/mach-default/mach_pgtable-3level-defs.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_MACH_PGTABLE_3LEVEL_DEFS_H
+#define _ASM_MACH_PGTABLE_3LEVEL_DEFS_H
+
+#define HAVE_SHARED_KERNEL_PMD 1
+
+#endif
--- linux-2.6.12-xen0/include/asm-i386/mach-xen/mach_pgtable-2level-defs.h 1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.12-xen0-arch/include/asm-i386/mach-xen/mach_pgtable-2level-defs.h 2005-08-02 20:25:36.000000000 -0700
@@ -0,0 +1,6 @@
+#ifndef _ASM_MACH_PGTABLE_2LEVEL_DEFS_H
+#define _ASM_MACH_PGTABLE_2LEVEL_DEFS_H
+
+#define PTRS_PER_PGD_NO_HV (HYPERVISOR_VIRT_START >> PGDIR_SHIFT)
+
+#endif
diff -Naur -x vmlinuz -X linux-2.6.12-xen0/Documentation/dontdiff linux-2.6.12-xen0/include/asm-i386/mach-xen/mach_pgtable-2level.h linux-2.6.12-xen0-arch/include/asm-i386/mach-xen/mach_pgtable-2level.h
--- linux-2.6.12-xen0/include/asm-i386/mach-xen/mach_pgtable-2level.h 1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.12-xen0-arch/include/asm-i386/mach-xen/mach_pgtable-2level.h 2005-08-02 21:01:23.000000000 -0700
@@ -0,0 +1,49 @@
+#ifndef _ASM_MACH_PGTABLE_2LEVEL_H
+#define _ASM_MACH_PGTABLE_2LEVEL_H
+
+#include <mach_pgtable-2level-defs.h>
+
+#ifndef CONFIG_XEN_SHADOW_MODE
+#define mach_set_pmd(pmdptr, pmdval) xen_l2_entry_update((pmdptr), (pmdval))
+#else
+#define mach_set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))
+#endif
+
+#define mach_ptep_get_and_clear(mm,addr,xp) __pte_ma(xchg(&(xp)->pte_low, 0))
+
+/*
+ * 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 high bit gets shifted out
+ * (e.g., phys_to_machine()) so behaviour there is correct.
+ */
+#define INVALID_P2M_ENTRY (~0U)
+#define FOREIGN_FRAME(_m) ((_m) | (1UL<<((sizeof(unsigned long)*8)-1)))
+#define pte_mfn(_pte) ((_pte).pte_low >> PAGE_SHIFT)
+#define mach_pte_pfn(_pte) \
+({ \
+ unsigned long mfn = pte_mfn(_pte); \
+ unsigned long pfn = mfn_to_pfn(mfn); \
+ if ((pfn >= max_mapnr) || (pfn_to_mfn(pfn) != mfn)) \
+ pfn = max_mapnr; /* special: force !pfn_valid() */ \
+ pfn; \
+})
+
+#define mach_pte_page(_pte) pfn_to_page(pte_pfn(_pte))
+#define pfn_pte_ma(pfn, prot) __pte_ma(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
+
+#endif
diff -Naur -x vmlinuz -X linux-2.6.12-xen0/Documentation/dontdiff linux-2.6.12-xen0/include/asm-i386/mach-xen/mach_pgtable-3level-defs.h linux-2.6.12-xen0-arch/include/asm-i386/mach-xen/mach_pgtable-3level-defs.h
--- linux-2.6.12-xen0/include/asm-i386/mach-xen/mach_pgtable-3level-defs.h 1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.12-xen0-arch/include/asm-i386/mach-xen/mach_pgtable-3level-defs.h 2005-08-02 20:24:39.000000000 -0700
@@ -0,0 +1,7 @@
+#ifndef _ASM_MACH_PGTABLE_3LEVEL_DEFS_H
+#define _ASM_MACH_PGTABLE_3LEVEL_DEFS_H
+
+#define HAVE_SHARED_KERNEL_PMD 0
+#define PTRS_PER_PGD_NO_HV 4
+
+#endif
diff -Naur -x vmlinuz -X linux-2.6.12-xen0/Documentation/dontdiff linux-2.6.12-xen0/include/asm-i386/mach-xen/mach_pgtable.h linux-2.6.12-xen0-arch/include/asm-i386/mach-xen/mach_pgtable.h
--- linux-2.6.12-xen0/include/asm-i386/mach-xen/mach_pgtable.h 1969-12-31 16:00:00.000000000 -0800
+++ linux-2.6.12-xen0-arch/include/asm-i386/mach-xen/mach_pgtable.h 2005-08-03 01:36:51.000000000 -0700
@@ -0,0 +1,98 @@
+#ifndef __ASM_MACH_PGTABLE_H
+#define __ASM_MACH_PGTABLE_H
+
+#include <xen_hypervisor.h>
+
+/* pmd_present doesn't just test the _PAGE_PRESENT bit since wr.p.t.
+ can temporarily clear it. */
+#define mach_pmd_present(x) (pmd_val(x))
+#define mach_pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER & ~_PAGE_PRESENT)) != (_KERNPG_TABLE & ~_PAGE_PRESENT))
+
+static inline void mach_ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+ if (pte_write(*ptep))
+ clear_bit(_PAGE_BIT_RW, &ptep->pte_low);
+}
+
+#define mach_ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
+ do { \
+ if (__dirty) { \
+ if ( likely((__vma)->vm_mm == current->mm) ) { \
+ HYPERVISOR_update_va_mapping((__address), (__entry), UVMF_INVLPG|UVMF_MULTI|(unsigned long)((__vma)->vm_mm->cpu_vm_mask.bits)); \
+ } else { \
+ xen_l1_entry_update((__ptep), (__entry)); \
+ flush_tlb_page((__vma), (__address)); \
+ } \
+ } \
+ } while (0)
+
+#define __HAVE_ARCH_PTEP_ESTABLISH
+#define ptep_establish(__vma, __address, __ptep, __entry) \
+do { \
+ ptep_set_access_flags(__vma, __address, __ptep, __entry, 1); \
+} while (0)
+
+#define __HAVE_ARCH_PTEP_ESTABLISH_NEW
+#define ptep_establish_new(__vma, __address, __ptep, __entry) \
+do { \
+ if (likely((__vma)->vm_mm == current->mm)) { \
+ HYPERVISOR_update_va_mapping((__address), \
+ __entry, 0); \
+ } else { \
+ xen_l1_entry_update((__ptep), (__entry)); \
+ } \
+} while (0)
+
+#ifndef CONFIG_XEN_SHADOW_MODE
+void make_lowmem_page_readonly(void *va);
+void make_lowmem_page_writable(void *va);
+void make_page_readonly(void *va);
+void make_page_writable(void *va);
+void make_pages_readonly(void *va, unsigned int nr);
+void make_pages_writable(void *va, unsigned int nr);
+#else
+#define make_lowmem_page_readonly(_va) ((void)0)
+#define make_lowmem_page_writable(_va) ((void)0)
+#define make_page_readonly(_va) ((void)0)
+#define make_page_writable(_va) ((void)0)
+#define make_pages_readonly(_va, _nr) ((void)0)
+#define make_pages_writable(_va, _nr) ((void)0)
+#endif
+
+#define virt_to_ptep(__va) \
+({ \
+ pgd_t *__pgd = pgd_offset_k((unsigned long)(__va)); \
+ pud_t *__pud = pud_offset(__pgd, (unsigned long)(__va)); \
+ pmd_t *__pmd = pmd_offset(__pud, (unsigned long)(__va)); \
+ pte_offset_kernel(__pmd, (unsigned long)(__va)); \
+})
+
+#define arbitrary_virt_to_machine(__va) \
+({ \
+ pte_t *__pte = virt_to_ptep(__va); \
+ unsigned long __pa = (*(unsigned long *)__pte) & PAGE_MASK; \
+ __pa | ((unsigned long)(__va) & (PAGE_SIZE-1)); \
+})
+
+int direct_remap_area_pages(struct mm_struct *mm,
+ unsigned long address,
+ unsigned long machine_addr,
+ unsigned long size,
+ pgprot_t prot,
+ domid_t domid);
+int __direct_remap_area_pages(struct mm_struct *mm,
+ unsigned long address,
+ unsigned long size,
+ mmu_update_t *v);
+
+#define mach_io_remap_page_range(vma,from,phys,size,prot) \
+direct_remap_area_pages(vma->vm_mm,from,phys,size,prot,DOMID_IO)
+
+#define mach_io_remap_pfn_range(vma,from,pfn,size,prot) \
+direct_remap_area_pages(vma->vm_mm,from,pfn<<PAGE_SHIFT,size,prot,DOMID_IO)
+
+extern void mm_pin(struct mm_struct *mm);
+extern void mm_unpin(struct mm_struct *mm);
+void mm_pin_all(void);
+
+#endif

--


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