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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 10/10] xen: arm: Use a direct mapping of RAM on arm64
We have plenty of virtual address space so we can avoid needing to map and
unmap pages all the time.
A totally arbitrarily chosen 32GB frame table leads to support for 5TB of RAM.
I haven't tested with anything near that amount of RAM though. There is plenty
of room to expand further when that becomes necessary.
Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
xen/arch/arm/mm.c | 155 ++++++++++++++++++++++++++++++++++--------
xen/arch/arm/setup.c | 92 +++++++++++++++++++++++++
xen/include/asm-arm/config.h | 96 +++++++++++++++++++-------
xen/include/asm-arm/mm.h | 16 ++++
4 files changed, 307 insertions(+), 52 deletions(-)
diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 5ad687f..35ef56d 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -37,6 +37,7 @@
#include <public/memory.h>
#include <xen/sched.h>
#include <xen/vmap.h>
+#include <asm/early_printk.h>
#include <xsm/xsm.h>
#include <xen/pfn.h>
@@ -48,6 +49,14 @@ struct domain *dom_xen, *dom_io, *dom_cow;
lpae_t boot_pgtable[LPAE_ENTRIES] __attribute__((__aligned__(4096)));
#ifdef CONFIG_ARM_64
lpae_t boot_first[LPAE_ENTRIES] __attribute__((__aligned__(4096)));
+/* The first page of the first level mapping of the xenheap. The
+ * subsequent xenheap first level pages are dynamically allocated, but
+ * we need this one to bootstrap ourselves. */
+lpae_t xenheap_first_first[LPAE_ENTRIES] __attribute__((__aligned__(4096)));
+/* The zeroeth level slot which uses xenheap_first_first. Used because
+ * setup_xenheap_mappings otherwise relies on mfn_to_virt which isn't
+ * valid for a non-xenheap mapping. */
+static __initdata int xenheap_first_first_slot = -1;
#endif
/*
@@ -57,6 +66,9 @@ lpae_t boot_first[LPAE_ENTRIES]
__attribute__((__aligned__(4096)));
* xen_second, xen_fixmap and xen_xenmap are shared between all PCPUs.
*/
+#ifdef CONFIG_ARM_64
+#define THIS_CPU_PGTABLE boot_pgtable
+#else
/* Per-CPU pagetable pages */
/* xen_pgtable == root of the trie (zeroeth level on 64-bit, first on 32-bit)
*/
static DEFINE_PER_CPU(lpae_t *, xen_pgtable);
@@ -65,6 +77,7 @@ static DEFINE_PER_CPU(lpae_t *, xen_pgtable);
* the second level pagetables which mapp the domheap region
* DOMHEAP_VIRT_START...DOMHEAP_VIRT_END in 2MB chunks. */
static DEFINE_PER_CPU(lpae_t *, xen_dommap);
+#endif
/* Common pagetable leaves */
/* Second level page tables.
@@ -73,10 +86,16 @@ static DEFINE_PER_CPU(lpae_t *, xen_dommap);
* addresses from 0 to 0x7fffffff. Offsets into it are calculated
* with second_linear_offset(), not second_table_offset().
*
- * Addresses 0x80000000 to 0xffffffff are covered by the per-cpu
- * xen_domheap mappings described above. However we allocate 4 pages
+ * On 32bit addresses 0x80000000 to 0xffffffff are covered by the
+ * per-cpu xen_domheap mappings described above. We allocate 4 pages
* here for use in the boot page tables and the second two pages
* become the boot CPUs xen_dommap pages.
+ *
+ * On 64bit addresses 0x80000000 to 0xffffffff are unused. However we
+ * allocate 4 pages here for use while relocating Xen, which currently
+ * expects a second level page to exist for all addresses in the first
+ * 4GB. We need to keep these extra mappings in place for seconary CPU
+ * bring up too. For now we just leave them forever.
*/
lpae_t xen_second[LPAE_ENTRIES*4] __attribute__((__aligned__(4096*4)));
/* First level page table used for fixmap */
@@ -92,7 +111,7 @@ uint64_t boot_ttbr;
static paddr_t phys_offset;
/* Limits of the Xen heap */
-unsigned long xenheap_mfn_start __read_mostly;
+unsigned long xenheap_mfn_start __read_mostly = ~0UL;
unsigned long xenheap_mfn_end __read_mostly;
unsigned long xenheap_virt_end __read_mostly;
@@ -112,7 +131,9 @@ static inline void
check_memory_layout_alignment_constraints(void) {
BUILD_BUG_ON(BOOT_MISC_VIRT_START & ~SECOND_MASK);
/* 1GB aligned regions */
BUILD_BUG_ON(XENHEAP_VIRT_START & ~FIRST_MASK);
+#ifdef CONFIG_DOMAIN_PAGE
BUILD_BUG_ON(DOMHEAP_VIRT_START & ~FIRST_MASK);
+#endif
}
void dump_pt_walk(lpae_t *first, paddr_t addr)
@@ -180,6 +201,7 @@ void clear_fixmap(unsigned map)
flush_xen_data_tlb_range_va(FIXMAP_ADDR(map), PAGE_SIZE);
}
+#ifdef CONFIG_DOMAIN_PAGE
void *map_domain_page_global(unsigned long mfn)
{
return vmap(&mfn, 1);
@@ -284,6 +306,7 @@ unsigned long domain_page_map_to_mfn(const void *va)
return map[slot].pt.base + offset;
}
+#endif
void __init arch_init_memory(void)
{
@@ -431,6 +454,7 @@ void __init setup_pagetables(unsigned long
boot_phys_offset, paddr_t xen_paddr)
/* Flush everything after setting WXN bit. */
flush_xen_text_tlb();
+#ifdef CONFIG_ARM_32
per_cpu(xen_pgtable, 0) = boot_pgtable;
per_cpu(xen_dommap, 0) = xen_second +
second_linear_offset(DOMHEAP_VIRT_START);
@@ -440,43 +464,31 @@ void __init setup_pagetables(unsigned long
boot_phys_offset, paddr_t xen_paddr)
memset(this_cpu(xen_dommap), 0, DOMHEAP_SECOND_PAGES*PAGE_SIZE);
flush_xen_dcache_va_range(this_cpu(xen_dommap),
DOMHEAP_SECOND_PAGES*PAGE_SIZE);
+#endif
}
int init_secondary_pagetables(int cpu)
{
- lpae_t *root, *first, *domheap, pte;
- int i;
-
- root = alloc_xenheap_page();
#ifdef CONFIG_ARM_64
- first = alloc_xenheap_page();
+ /* All CPUs share a single page table on 64 bit */
+ return 0;
#else
- first = root; /* root == first level on 32-bit 3-level trie */
-#endif
+ lpae_t *first, *domheap, pte;
+ int i;
+
+ first = alloc_xenheap_page(); /* root == first level on 32-bit 3-level
trie */
domheap = alloc_xenheap_pages(get_order_from_pages(DOMHEAP_SECOND_PAGES),
0);
- if ( root == NULL || domheap == NULL || first == NULL )
+ if ( domheap == NULL || first == NULL )
{
printk("Not enough free memory for secondary CPU%d pagetables\n", cpu);
free_xenheap_pages(domheap,
get_order_from_pages(DOMHEAP_SECOND_PAGES));
-#ifdef CONFIG_ARM_64
free_xenheap_page(first);
-#endif
- free_xenheap_page(root);
return -ENOMEM;
}
/* Initialise root pagetable from root of boot tables */
- memcpy(root, boot_pgtable, PAGE_SIZE);
-
-#ifdef CONFIG_ARM_64
- /* Initialise first pagetable from first level of boot tables, and
- * hook into the new root. */
- memcpy(first, boot_first, PAGE_SIZE);
- pte = mfn_to_xen_entry(virt_to_mfn(first));
- pte.pt.table = 1;
- write_pte(root, pte);
-#endif
+ memcpy(first, boot_pgtable, PAGE_SIZE);
/* Ensure the domheap has no stray mappings */
memset(domheap, 0, DOMHEAP_SECOND_PAGES*PAGE_SIZE);
@@ -490,16 +502,14 @@ int init_secondary_pagetables(int cpu)
write_pte(&first[first_table_offset(DOMHEAP_VIRT_START+i*FIRST_SIZE)],
pte);
}
- flush_xen_dcache_va_range(root, PAGE_SIZE);
-#ifdef CONFIG_ARM_64
flush_xen_dcache_va_range(first, PAGE_SIZE);
-#endif
flush_xen_dcache_va_range(domheap, DOMHEAP_SECOND_PAGES*PAGE_SIZE);
- per_cpu(xen_pgtable, cpu) = root;
+ per_cpu(xen_pgtable, cpu) = first;
per_cpu(xen_dommap, cpu) = domheap;
return 0;
+#endif
}
/* MMU setup for secondary CPUS (which already have paging enabled) */
@@ -544,6 +554,7 @@ static void __init create_32mb_mappings(lpae_t *second,
flush_xen_data_tlb();
}
+#ifdef CONFIG_ARM_32
/* Set up the xenheap: up to 1GB of contiguous, always-mapped memory. */
void __init setup_xenheap_mappings(unsigned long base_mfn,
unsigned long nr_mfns)
@@ -556,19 +567,107 @@ void __init setup_xenheap_mappings(unsigned long
base_mfn,
xenheap_mfn_end = base_mfn + nr_mfns;
}
+#else /* CONFIG_ARM_64 */
+
+void __init setup_xenheap_mappings(unsigned long base_mfn,
+ unsigned long nr_mfns)
+{
+ lpae_t *first, pte;
+ unsigned long offset, end_mfn;
+ vaddr_t vaddr;
+
+ /* First call sets the xenheap physical offset. */
+ if ( xenheap_mfn_start == ~0UL )
+ xenheap_mfn_start = base_mfn;
+
+ if ( base_mfn < xenheap_mfn_start )
+ early_panic("cannot add xenheap mapping at %lx below heap start %lx\n",
+ base_mfn, xenheap_mfn_start);
+
+ end_mfn = base_mfn + nr_mfns;
+
+ /* Align to previous 1GB boundary */
+ base_mfn &= ~FIRST_MASK;
+
+ offset = base_mfn - xenheap_mfn_start;
+ vaddr = DIRECTMAP_VIRT_START + offset*PAGE_SIZE;
+
+ while ( base_mfn < end_mfn )
+ {
+ int slot = zeroeth_table_offset(vaddr);
+ lpae_t *p = &boot_pgtable[slot];
+
+ if ( p->pt.valid )
+ {
+ /* mfn_to_virt is not valid on the 1st 1st mfn, since it
+ * is not within the xenheap. */
+ first = slot == xenheap_first_first_slot ?
+ xenheap_first_first : mfn_to_virt(p->pt.base);
+ }
+ else if ( xenheap_first_first_slot == -1)
+ {
+ /* Use xenheap_first_first to bootstrap the mappings */
+ first = xenheap_first_first;
+
+ pte = pte_of_xenaddr((vaddr_t)xenheap_first_first);
+ pte.pt.table = 1;
+ write_pte(p, pte);
+
+ xenheap_first_first_slot = slot;
+ }
+ else
+ {
+ unsigned long first_mfn = alloc_boot_pages(1, 1);
+ pte = mfn_to_xen_entry(first_mfn);
+ pte.pt.table = 1;
+ write_pte(p, pte);
+ first = mfn_to_virt(first_mfn);
+ }
+
+ pte = mfn_to_xen_entry(base_mfn);
+ //pte.pt.contig = /* XXX need to think about the logic */
+ write_pte(&first[first_table_offset(vaddr)], pte);
+
+ base_mfn += FIRST_SIZE>>PAGE_SHIFT;
+ vaddr += FIRST_SIZE;
+ }
+
+ flush_xen_data_tlb();
+}
+#endif
+
/* Map a frame table to cover physical addresses ps through pe */
void __init setup_frametable_mappings(paddr_t ps, paddr_t pe)
{
unsigned long nr_pages = (pe - ps) >> PAGE_SHIFT;
unsigned long frametable_size = nr_pages * sizeof(struct page_info);
unsigned long base_mfn;
+#ifdef CONFIG_ARM_64
+ lpae_t *second, pte;
+ unsigned long nr_second, second_base;
+ int i;
+#endif
frametable_base_mfn = ps >> PAGE_SHIFT;
/* Round up to 32M boundary */
frametable_size = (frametable_size + 0x1ffffff) & ~0x1ffffff;
base_mfn = alloc_boot_pages(frametable_size >> PAGE_SHIFT, 32<<(20-12));
+
+#ifdef CONFIG_ARM_64
+ nr_second = frametable_size >> SECOND_SHIFT;
+ second_base = alloc_boot_pages(nr_second, 1);
+ second = mfn_to_virt(second_base);
+ for ( i = 0; i < nr_second; i++ )
+ {
+ pte = mfn_to_xen_entry(second_base + i);
+ pte.pt.table = 1;
+ write_pte(&boot_first[first_table_offset(FRAMETABLE_VIRT_START)+i],
pte);
+ }
+ create_32mb_mappings(second, 0, base_mfn, frametable_size >> PAGE_SHIFT);
+#else
create_32mb_mappings(xen_second, FRAMETABLE_VIRT_START, base_mfn,
frametable_size >> PAGE_SHIFT);
+#endif
memset(&frame_table[0], 0, nr_pages * sizeof(struct page_info));
memset(&frame_table[nr_pages], -1,
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index da2a734..3efa063 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -279,6 +279,7 @@ static paddr_t __init get_xen_paddr(void)
return paddr;
}
+#ifdef CONFIG_ARM_32
static void __init setup_mm(unsigned long dtb_paddr, size_t dtb_size)
{
paddr_t ram_start;
@@ -392,6 +393,97 @@ static void __init setup_mm(unsigned long dtb_paddr,
size_t dtb_size)
end_boot_allocator();
}
+#else /* CONFIG_ARM_64 */
+static void __init setup_mm(unsigned long dtb_paddr, size_t dtb_size)
+{
+ paddr_t ram_start = ~0;
+ paddr_t ram_end = 0;
+ int bank;
+ unsigned long xenheap_pages = 0;
+ unsigned long dtb_pages;
+
+ /*
+ * TODO: only using the first RAM bank for now. The heaps and the
+ * frame table assume RAM is physically contiguous.
+ */
+ total_pages = 0;
+ for ( bank = 0 ; bank < early_info.mem.nr_banks; bank++ )
+ {
+ paddr_t bank_start = early_info.mem.bank[bank].start;
+ paddr_t bank_size = early_info.mem.bank[bank].size;
+ paddr_t bank_end = bank_start + bank_size;
+ unsigned long bank_pages = bank_size >> PAGE_SHIFT;
+ paddr_t s, e;
+
+ total_pages += bank_pages;
+
+ if ( bank_start < ram_start )
+ ram_start = bank_start;
+ if ( bank_end > ram_end )
+ ram_end = bank_end;
+
+ /*
+ * Locate the xenheap using these constraints:
+ *
+ * - must be 32 MiB aligned
+ * - must not include Xen itself or the boot modules
+ * - must be at most 1 GiB
+ * - must be at least 128M
+ *
+ * We try to allocate the largest xenheap possible within these
+ * constraints.
+ */
+ xenheap_pages += (bank_size >> PAGE_SHIFT);
+
+ /* XXX we assume that the ram regions are ordered */
+ s = bank_start;
+ while ( s < bank_end )
+ {
+ paddr_t n = bank_end;
+
+ e = next_module(s, &n);
+
+ if ( e == ~(paddr_t)0 )
+ {
+ e = n = bank_end;
+ }
+
+ setup_xenheap_mappings(s>>PAGE_SHIFT, (e-s)>>PAGE_SHIFT);
+
+ xenheap_mfn_end = e;
+
+ init_boot_pages(s, e);
+ s = n;
+ }
+ }
+
+ xenheap_virt_end = XENHEAP_VIRT_START + ram_end - ram_start;
+ xenheap_mfn_start = ram_start >> PAGE_SHIFT;
+ xenheap_mfn_end = ram_end >> PAGE_SHIFT;
+ xenheap_max_mfn(xenheap_mfn_end);
+
+ /*
+ * Need enough mapped pages for copying the DTB.
+ *
+ * TODO: The DTB (and other payloads) are assumed to be towards
+ * the start of RAM.
+ */
+ dtb_pages = (dtb_size + PAGE_SIZE-1) >> PAGE_SHIFT;
+
+ /*
+ * Copy the DTB.
+ *
+ * TODO: handle other payloads too.
+ */
+ device_tree_flattened = mfn_to_virt(alloc_boot_pages(dtb_pages, 1));
+ copy_from_paddr(device_tree_flattened, dtb_paddr, dtb_size, BUFFERABLE);
+
+ setup_frametable_mappings(ram_start, ram_end);
+ max_page = PFN_DOWN(ram_end);
+
+ end_boot_allocator();
+}
+#endif
size_t __read_mostly cacheline_bytes;
diff --git a/xen/include/asm-arm/config.h b/xen/include/asm-arm/config.h
index fb9e93c..259d4c6 100644
--- a/xen/include/asm-arm/config.h
+++ b/xen/include/asm-arm/config.h
@@ -35,9 +35,6 @@
#define CONFIG_SMP 1
-#define CONFIG_DOMAIN_PAGE 1
-#define CONFIG_SEPARATE_XENHEAP 1
-
#define CONFIG_VIDEO 1
#define OPT_CONSOLE_STR "dtuart"
@@ -76,38 +73,89 @@
#include <xen/const.h>
/*
- * Memory layout:
- * 0 - 2M Unmapped
- * 2M - 4M Xen text, data, bss
- * 4M - 6M Fixmap: special-purpose 4K mapping slots
- * 6M - 8M Early boot misc (see below)
- *
- * 32M - 128M Frametable: 24 bytes per page for 16GB of RAM
- * 256M - 1G VMAP: ioremap and early_ioremap use this virtual address
- * space
- *
- * 1G - 2G Xenheap: always-mapped memory
- * 2G - 4G Domheap: on-demand-mapped
+ * Common ARM32 and ARM64 layout:
+ * 0 - 2M Unmapped
+ * 2M - 4M Xen text, data, bss
+ * 4M - 6M Fixmap: special-purpose 4K mapping slots
+ * 6M - 8M Early boot misc (see below)
*
* The early boot misc area is used:
* - in head.S for the DTB for device_tree_early_init().
* - in setup_pagetables() when relocating Xen.
+ *
+ * ARM32 layout:
+ * 0 - 8M <COMMON>
+ *
+ * 32M - 128M Frametable: 24 bytes per page for 16GB of RAM
+ * 256M - 1G VMAP: ioremap and early_ioremap use this virtual address
+ * space
+ *
+ * 1G - 2G Xenheap: always-mapped memory
+ * 2G - 4G Domheap: on-demand-mapped
+ *
+ * ARM64 layout:
+ * 0x0000000000000000 - 0x0000007fffffffff (512GB, L0 slot [0])
+ * 0 - 8M <COMMON>
+ *
+ * 1G - 2G VMAP: ioremap and early_ioremap
+ *
+ * 32G - 64G Frametable: 24 bytes per page for 5.3TB of RAM
+ *
+ * 0x0000008000000000 - 0x00007fffffffffff (127.5TB, L0 slots [1..255])
+ * Unused
+ *
+ * 0x0000800000000000 - 0x000084ffffffffff (5TB, L0 slots [256..265])
+ * 1:1 mapping of RAM
+ *
+ * 0x0000850000000000 - 0x0000ffffffffffff (123TB, L0 slots [266..511])
+ * Unused
*/
-#define XEN_VIRT_START _AC(0x00200000,UL)
-#define FIXMAP_ADDR(n) (_AC(0x00400000,UL) + (n) * PAGE_SIZE)
-#define BOOT_MISC_VIRT_START _AC(0x00600000,UL)
-#define FRAMETABLE_VIRT_START _AC(0x02000000,UL)
-#define VMAP_VIRT_START _AC(0x10000000,UL)
-#define XENHEAP_VIRT_START _AC(0x40000000,UL)
-#define DOMHEAP_VIRT_START _AC(0x80000000,UL)
-#define DOMHEAP_VIRT_END _AC(0xffffffff,UL)
+#define XEN_VIRT_START _AT(vaddr_t,0x00200000)
+#define FIXMAP_ADDR(n) (_AT(vaddr_t,0x00400000) + (n) * PAGE_SIZE)
+#define BOOT_MISC_VIRT_START _AT(vaddr_t,0x00600000)
-#define VMAP_VIRT_END XENHEAP_VIRT_START
#define HYPERVISOR_VIRT_START XEN_VIRT_START
+#ifdef CONFIG_ARM_32
+
+#define CONFIG_DOMAIN_PAGE 1
+#define CONFIG_SEPARATE_XENHEAP 1
+
+#define FRAMETABLE_VIRT_START _AT(vaddr_t,0x02000000)
+#define VMAP_VIRT_START _AT(vaddr_t,0x10000000)
+#define XENHEAP_VIRT_START _AT(vaddr_t,0x40000000)
+#define XENHEAP_VIRT_END _AT(vaddr_t,0x7fffffff)
+#define DOMHEAP_VIRT_START _AT(vaddr_t,0x80000000)
+#define DOMHEAP_VIRT_END _AT(vaddr_t,0xffffffff)
+
+#define VMAP_VIRT_END XENHEAP_VIRT_START
+
#define DOMHEAP_ENTRIES 1024 /* 1024 2MB mapping slots */
+#else /* ARM_64 */
+
+#define SLOT0_ENTRY_BITS 39
+#define SLOT0(slot) (_AT(vaddr_t,slot) << SLOT0_ENTRY_BITS)
+#define SLOT0_ENTRY_SIZE SLOT0(1)
+#define GB(_gb) (_AC(_gb, UL) << 30)
+
+#define VMAP_VIRT_START GB(1)
+#define VMAP_VIRT_END (VMAP_VIRT_START + GB(1) - 1)
+
+#define FRAMETABLE_VIRT_START GB(32)
+#define FRAMETABLE_VIRT_END (FRAMETABLE_VIRT_START + GB(32) - 1)
+
+#define DIRECTMAP_VIRT_START SLOT0(256)
+#define DIRECTMAP_SIZE (SLOT0_ENTRY_SIZE * (265-256))
+#define DIRECTMAP_VIRT_END (DIRECTMAP_VIRT_START + DIRECTMAP_SIZE - 1)
+
+#define XENHEAP_VIRT_START DIRECTMAP_VIRT_START
+
+#define HYPERVISOR_VIRT_END DIRECTMAP_VIRT_END
+
+#endif
+
/* Number of domheap pagetable pages required at the second level (2MB
mappings) */
#define DOMHEAP_SECOND_PAGES ((DOMHEAP_VIRT_END - DOMHEAP_VIRT_START + 1) >>
FIRST_SHIFT)
diff --git a/xen/include/asm-arm/mm.h b/xen/include/asm-arm/mm.h
index 7aca836..27284d0 100644
--- a/xen/include/asm-arm/mm.h
+++ b/xen/include/asm-arm/mm.h
@@ -118,11 +118,18 @@ struct page_info
extern unsigned long xenheap_mfn_start, xenheap_mfn_end;
extern unsigned long xenheap_virt_end;
+#ifdef CONFIG_ARM_32
#define is_xen_heap_page(page) is_xen_heap_mfn(page_to_mfn(page))
#define is_xen_heap_mfn(mfn) ({ \
unsigned long _mfn = (mfn); \
(_mfn >= xenheap_mfn_start && _mfn < xenheap_mfn_end); \
})
+#else
+#define is_xen_heap_page(page) ((page)->count_info & PGC_xen_heap)
+#define is_xen_heap_mfn(mfn) \
+ (mfn_valid(mfn) && is_xen_heap_page(__mfn_to_page(mfn)))
+#endif
+
#define is_xen_fixed_mfn(mfn) \
((((mfn) << PAGE_SHIFT) >= virt_to_maddr(&_start)) && \
(((mfn) << PAGE_SHIFT) <= virt_to_maddr(&_end)))
@@ -215,12 +222,21 @@ static inline paddr_t __virt_to_maddr(vaddr_t va)
}
#define virt_to_maddr(va) __virt_to_maddr((vaddr_t)(va))
+#ifdef CONFIG_ARM_32
static inline void *maddr_to_virt(paddr_t ma)
{
ASSERT(is_xen_heap_mfn(ma >> PAGE_SHIFT));
ma -= pfn_to_paddr(xenheap_mfn_start);
return (void *)(unsigned long) ma + XENHEAP_VIRT_START;
}
+#else
+static inline void *maddr_to_virt(paddr_t ma)
+{
+ ASSERT((ma >> PAGE_SHIFT) < (DIRECTMAP_SIZE >> PAGE_SHIFT));
+ ma -= pfn_to_paddr(xenheap_mfn_start);
+ return (void *)(unsigned long) ma + DIRECTMAP_VIRT_START;
+}
+#endif
static inline int gvirt_to_maddr(vaddr_t va, paddr_t *pa)
{
--
1.7.2.5
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