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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Fix x86/64 Linux memory map initialisation.
ChangeSet 1.1507, 2005/05/22 08:38:53+01:00, kaf24@xxxxxxxxxxxxxxxxxxxx
Fix x86/64 Linux memory map initialisation.
Signed-off-by: Jun Nakajima <jun.nakajima@xxxxxxxxx>
init.c | 201 +++++++++++++++++++++++++++++++++++++----------------------------
1 files changed, 116 insertions(+), 85 deletions(-)
diff -Nru a/linux-2.6.11-xen-sparse/arch/xen/x86_64/mm/init.c
b/linux-2.6.11-xen-sparse/arch/xen/x86_64/mm/init.c
--- a/linux-2.6.11-xen-sparse/arch/xen/x86_64/mm/init.c 2005-05-22 13:04:43
-04:00
+++ b/linux-2.6.11-xen-sparse/arch/xen/x86_64/mm/init.c 2005-05-22 13:04:43
-04:00
@@ -68,19 +68,19 @@
{
unsigned long addr;
pte_t *pte;
- unsigned long *page = (unsigned long *) init_level4_pgt;
+ unsigned long *page = (unsigned long *) init_level4_pgt;
- addr = (unsigned long) page[pgd_index(va)];
- addr_to_page(addr, page);
+ addr = (unsigned long) page[pgd_index(va)];
+ addr_to_page(addr, page);
- addr = page[pud_index(va)];
- addr_to_page(addr, page);
+ addr = page[pud_index(va)];
+ addr_to_page(addr, page);
- addr = page[pmd_index(va)];
- addr_to_page(addr, page);
+ addr = page[pmd_index(va)];
+ addr_to_page(addr, page);
- pte = (pte_t *) &page[pte_index(va)];
- xen_l1_entry_update(pte, (*(unsigned long*)pte) & ~_PAGE_RW);
+ pte = (pte_t *) &page[pte_index(va)];
+ xen_l1_entry_update(pte, (*(unsigned long*)pte) & ~_PAGE_RW);
__flush_tlb_one(addr);
}
@@ -106,7 +106,7 @@
/*
- * Assume the tranlation is already established.
+ * Assume the translation is already established.
*/
void make_page_readonly(void *va)
{
@@ -385,72 +385,9 @@
}
set_pte_phys(address, phys, prot, SET_FIXMAP_USER);
-
-#if 0
- page = (unsigned long *) user_level3_pgt;
- pud = page[pud_index(address)];
-
- printk("pud = %p\n", pud);
-
- pmd = (pmd_t *) spp_getpage();
- printk("alloc pmd = %p\n", pmd);
-
- make_page_readonly((unsigned long)pmd);
-
- xen_pmd_pin(__pa(pmd));
-
- set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER));
-
- printk("after set_pud\n");
-
- pte = (pte_t *) spp_getpage();
- printk("pte = %p\n");
-
- make_page_readonly((unsigned long)pte);
-
- xen_pte_pin(__pa(pte));
-
- page = (unsigned long *) pud;
- pud = page[pud_index(address)];
-
-
- pmd = pmd_offset(pud, vaddr);
-
- set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER));
-#endif
-
}
-unsigned long __initdata table_start, table_end, tables_reserved;
-
-#if 0
-/*
- * Get the machine PFN given va
- */
-static unsigned long get_machine_pfn(unsigned long va)
-{
- unsigned long addr;
- pte_t *pte;
-
- unsigned long *page = (unsigned long *) init_level4_pgt;
-
- addr = (unsigned long) page[pgd_index(va)];
- addr &= PHYSICAL_PAGE_MASK;
- page = (unsigned long *) ((unsigned long)(((mfn_to_pfn(addr >>
PAGE_SHIFT)) << PAGE_SHIFT) + __START_KERNEL_map));
-
- addr = page[pud_index(va)];
- addr &= PHYSICAL_PAGE_MASK;
- page = (unsigned long *) ((unsigned long)(((mfn_to_pfn(addr >>
PAGE_SHIFT)) << PAGE_SHIFT) + __START_KERNEL_map));
-
- addr = page[pmd_index(va)];
- addr &= PHYSICAL_PAGE_MASK;
- page = (unsigned long *) ((unsigned long)(((mfn_to_pfn(addr >>
PAGE_SHIFT)) << PAGE_SHIFT)+ __START_KERNEL_map));
-
- pte = (pte_t *) &page[pte_index(va)];
-
- return (unsigned long) (pte->pte >> PAGE_SHIFT);
-}
-#endif
+unsigned long __initdata table_start, table_end, tables_space;
unsigned long get_machine_pfn(unsigned long addr)
{
@@ -461,17 +398,37 @@
return (pte->pte >> PAGE_SHIFT);
}
+#define ALIGN_TO_4K __attribute__((section(".data.page_aligned")))
+#define MAX_LOW_PAGES 0x20
+static unsigned long __init_pgt[MAX_LOW_PAGES][512] ALIGN_TO_4K;
+static int __init_pgt_index;
/*
* We start using from start_pfn
*/
-static __init void *alloc_low_page(unsigned long *phys)
+static __init void *alloc_static_page(unsigned long *phys)
+{
+ int i = __init_pgt_index++;
+
+ if (__init_pgt_index >= MAX_LOW_PAGES) {
+ printk("Need to increase MAX_LOW_PAGES");
+ BUG();
+ }
+
+ *phys = __pa(__init_pgt[i]);
+
+ return (void *) __init_pgt[i];
+}
+
+/*
+ * Get RO page
+ */
+static void __init *alloc_low_page(unsigned long *phys)
{
unsigned long pfn = table_end++;
*phys = (pfn << PAGE_SHIFT);
memset((void *) ((pfn << PAGE_SHIFT) + __START_KERNEL_map), 0,
PAGE_SIZE);
-
return (void *)((pfn << PAGE_SHIFT) + __START_KERNEL_map);
}
@@ -519,7 +476,7 @@
pte_save = pte;
for (k = 0; k < PTRS_PER_PTE; pte++, k++, paddr +=
PTE_SIZE) {
if (paddr < (table_start << PAGE_SHIFT)
- + tables_reserved)
+ + tables_space)
{
__set_pte(pte,
__pte(paddr | (_KERNPG_TABLE &
~_PAGE_RW)));
@@ -549,12 +506,83 @@
pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
ptes = (end + PTE_SIZE - 1) >> PAGE_SHIFT;
- tables_reserved = round_up(puds*8, PAGE_SIZE) + round_up(pmds * 8,
PAGE_SIZE)
- + round_up(ptes * 8, PAGE_SIZE);
- table_start = start_pfn;
- table_end = table_start;
+ tables_space = round_up(puds * 8, PAGE_SIZE) +
+ round_up(pmds * 8, PAGE_SIZE) +
+ round_up(ptes * 8, PAGE_SIZE);
}
+
+/*
+ * Extend kernel mapping to access pages for page tables. The initial
+ * mapping done by Xen is minimal (e.g. 8MB) and we need to extend the
+ * mapping for early initialization.
+ */
+
+#define MIN_INIT_SIZE 0x800000
+static unsigned long current_size, extended_size;
+
+void __init extend_init_mapping(void)
+{
+ unsigned long va = __START_KERNEL_map;
+ unsigned long addr, *pte_page;
+
+ unsigned long phys;
+ pmd_t *pmd;
+ pte_t *pte, new_pte;
+ unsigned long *page = (unsigned long *) init_level4_pgt;
+ int i;
+
+ addr = (unsigned long) page[pgd_index(va)];
+ addr_to_page(addr, page);
+
+ addr = page[pud_index(va)];
+ addr_to_page(addr, page);
+
+ for (;;) {
+ pmd = (pmd_t *) &page[pmd_index(va)];
+ if (pmd_present(*pmd)) {
+ /*
+ * if pmd is valid, check pte.
+ */
+ addr = page[pmd_index(va)];
+ addr_to_page(addr, pte_page);
+
+ for (i = 0; i < PTRS_PER_PTE; i++) {
+ pte = (pte_t *) &pte_page[pte_index(va)];
+
+ if (pte_present(*pte)) {
+ va += PAGE_SIZE;
+ current_size += PAGE_SIZE;
+ } else
+ break;
+ }
+
+ } else
+ break;
+ }
+
+ for (; va < __START_KERNEL_map + current_size + tables_space; ) {
+ pmd = (pmd_t *) &page[pmd_index(va)];
+
+ if (pmd_none(*pmd)) {
+ pte_page = (unsigned long *) alloc_static_page(&phys);
+ make_page_readonly(pte_page);
+ xen_pte_pin(phys);
+ set_pmd(pmd, __pmd(phys | _KERNPG_TABLE | _PAGE_USER));
+
+ for (i = 0; i < PTRS_PER_PTE; i++, va += PAGE_SIZE) {
+ new_pte = pfn_pte((va - __START_KERNEL_map) >>
PAGE_SHIFT,
+ __pgprot(_KERNPG_TABLE |
_PAGE_USER));
+
+ pte = (pte_t *) &pte_page[pte_index(va)];
+ xen_l1_entry_update(pte, new_pte.pte);
+ extended_size += PAGE_SIZE;
+ }
+ }
+ }
+}
+
+
/* Setup the direct mapping of the physical memory at PAGE_OFFSET.
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