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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] linux x86/64: Clean up mm initialisation a little.
# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1173118241 0
# Node ID 53589c343d46c8e4ccdfae468eb041feea502913
# Parent ff81ea60bc982339c191e116f8627b49754035a7
linux x86/64: Clean up mm initialisation a little.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
linux-2.6-xen-sparse/arch/x86_64/mm/init-xen.c | 134 +++++++++++--------------
1 files changed, 61 insertions(+), 73 deletions(-)
diff -r ff81ea60bc98 -r 53589c343d46
linux-2.6-xen-sparse/arch/x86_64/mm/init-xen.c
--- a/linux-2.6-xen-sparse/arch/x86_64/mm/init-xen.c Mon Mar 05 16:43:12
2007 +0000
+++ b/linux-2.6-xen-sparse/arch/x86_64/mm/init-xen.c Mon Mar 05 18:10:41
2007 +0000
@@ -309,36 +309,26 @@ static __init void set_pte_phys_ma(unsig
pmd = (pmd_t *) spp_getpage();
make_page_readonly(pmd, XENFEAT_writable_page_tables);
-
set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER));
-
if (pmd != pmd_offset(pud, 0)) {
printk("PAGETABLE BUG #01! %p <-> %p\n", pmd,
pmd_offset(pud,0));
return;
}
}
pmd = pmd_offset(pud, vaddr);
-
if (pmd_none(*pmd)) {
pte = (pte_t *) spp_getpage();
make_page_readonly(pte, XENFEAT_writable_page_tables);
-
set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER));
if (pte != pte_offset_kernel(pmd, 0)) {
printk("PAGETABLE BUG #02!\n");
return;
}
}
-
new_pte = pfn_pte_ma(phys >> PAGE_SHIFT, prot);
+
pte = pte_offset_kernel(pmd, vaddr);
-
- /*
- * Note that the pte page is already RO, thus we want to use
- * xen_l1_entry_update(), not set_pte().
- */
- xen_l1_entry_update(pte,
- pfn_pte_ma(phys >> PAGE_SHIFT, prot));
+ set_pte(pte, new_pte);
/*
* It's enough to flush this one mapping.
@@ -667,9 +657,9 @@ static void __init extend_init_mapping(u
}
}
-static unsigned long __init find_early_table_space(unsigned long end)
-{
- unsigned long puds, pmds, ptes, tables, fixmap_tables;
+static void __init find_early_table_space(unsigned long end)
+{
+ unsigned long puds, pmds, ptes, tables;
puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
@@ -679,16 +669,7 @@ static unsigned long __init find_early_t
round_up(pmds * 8, PAGE_SIZE) +
round_up(ptes * 8, PAGE_SIZE);
- /* Also reserve pages for fixmaps that need to be set up early.
- * Their pud is shared with the kernel pud.
- */
- pmds = (PMD_SIZE - 1 - FIXADDR_START) >> PMD_SHIFT;
- ptes = (PTE_SIZE - 1 - FIXADDR_START) >> PAGE_SHIFT;
-
- fixmap_tables = round_up(pmds * 8, PAGE_SIZE) +
- round_up(ptes * 8, PAGE_SIZE);
-
- extend_init_mapping(tables + fixmap_tables);
+ extend_init_mapping(tables);
table_start = start_pfn;
table_end = table_start + (tables>>PAGE_SHIFT);
@@ -696,8 +677,58 @@ static unsigned long __init find_early_t
early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n",
end, table_start << PAGE_SHIFT,
(table_start << PAGE_SHIFT) + tables);
-
- return table_end + (fixmap_tables>>PAGE_SHIFT);
+}
+
+static void xen_finish_init_mapping(void)
+{
+ unsigned long i, start, end;
+
+ /* Re-vector virtual addresses pointing into the initial
+ mapping to the just-established permanent ones. */
+ xen_start_info = __va(__pa(xen_start_info));
+ xen_start_info->pt_base = (unsigned long)
+ __va(__pa(xen_start_info->pt_base));
+ if (!xen_feature(XENFEAT_auto_translated_physmap)) {
+ phys_to_machine_mapping =
+ __va(__pa(xen_start_info->mfn_list));
+ xen_start_info->mfn_list = (unsigned long)
+ phys_to_machine_mapping;
+ }
+ if (xen_start_info->mod_start)
+ xen_start_info->mod_start = (unsigned long)
+ __va(__pa(xen_start_info->mod_start));
+
+ /* Destroy the Xen-created mappings beyond the kernel image as
+ * well as the temporary mappings created above. Prevents
+ * overlap with modules area (if init mapping is very big).
+ */
+ start = PAGE_ALIGN((unsigned long)_end);
+ end = __START_KERNEL_map + (table_end << PAGE_SHIFT);
+ for (; start < end; start += PAGE_SIZE)
+ WARN_ON(HYPERVISOR_update_va_mapping(
+ start, __pte_ma(0), 0));
+
+ /* Initialise all fixmap pagetables. Use 'start_pfn' allocator. */
+ table_end = ~0UL;
+ for (i = 0; i < __end_of_fixed_addresses; i++)
+ __set_fixmap(i, 0, __pgprot(0));
+ table_end = start_pfn;
+
+ /* Switch to the real shared_info page, and clear the
+ * dummy page. */
+ set_fixmap(FIX_SHARED_INFO, xen_start_info->shared_info);
+ HYPERVISOR_shared_info = (shared_info_t *)fix_to_virt(FIX_SHARED_INFO);
+ memset(empty_zero_page, 0, sizeof(empty_zero_page));
+
+ /* Setup mapping of lower 1st MB */
+ for (i = 0; i < NR_FIX_ISAMAPS; i++)
+ if (is_initial_xendomain())
+ set_fixmap(FIX_ISAMAP_BEGIN - i, i * PAGE_SIZE);
+ else
+ __set_fixmap(FIX_ISAMAP_BEGIN - i,
+ virt_to_mfn(empty_zero_page)
+ << PAGE_SHIFT,
+ PAGE_KERNEL_RO);
}
/* Setup the direct mapping of the physical memory at PAGE_OFFSET.
@@ -705,7 +736,7 @@ static unsigned long __init find_early_t
physical memory. To access them they are temporarily mapped. */
void __meminit init_memory_mapping(unsigned long start, unsigned long end)
{
- unsigned long next, table_rsrv_end = 0;
+ unsigned long next;
Dprintk("init_memory_mapping\n");
@@ -716,7 +747,7 @@ void __meminit init_memory_mapping(unsig
* discovered.
*/
if (!after_bootmem)
- table_rsrv_end = find_early_table_space(end);
+ find_early_table_space(end);
start = (unsigned long)__va(start);
end = (unsigned long)__va(end);
@@ -744,50 +775,7 @@ void __meminit init_memory_mapping(unsig
if (!after_bootmem) {
BUG_ON(start_pfn != table_end);
- table_end = table_rsrv_end;
-
- /* Re-vector virtual addresses pointing into the initial
- mapping to the just-established permanent ones. */
- xen_start_info = __va(__pa(xen_start_info));
- xen_start_info->pt_base = (unsigned long)
- __va(__pa(xen_start_info->pt_base));
- if (!xen_feature(XENFEAT_auto_translated_physmap)) {
- phys_to_machine_mapping =
- __va(__pa(xen_start_info->mfn_list));
- xen_start_info->mfn_list = (unsigned long)
- phys_to_machine_mapping;
- }
- if (xen_start_info->mod_start)
- xen_start_info->mod_start = (unsigned long)
- __va(__pa(xen_start_info->mod_start));
-
- /* Destroy the Xen-created mappings beyond the kernel image as
- * well as the temporary mappings created above. Prevents
- * overlap with modules area (if init mapping is very big).
- */
- start = PAGE_ALIGN((unsigned long)_end);
- end = __START_KERNEL_map + (table_end << PAGE_SHIFT);
- for (; start < end; start += PAGE_SIZE)
- WARN_ON(HYPERVISOR_update_va_mapping(
- start, __pte_ma(0), 0));
-
- /* Switch to the real shared_info page, and clear the
- * dummy page. */
- set_fixmap(FIX_SHARED_INFO, xen_start_info->shared_info);
- HYPERVISOR_shared_info = (shared_info_t
*)fix_to_virt(FIX_SHARED_INFO);
- memset(empty_zero_page, 0, sizeof(empty_zero_page));
-
- /* Setup mapping of lower 1st MB */
- for (next = 0; next < NR_FIX_ISAMAPS; next++)
- if (is_initial_xendomain())
- set_fixmap(FIX_ISAMAP_BEGIN - next, next *
PAGE_SIZE);
- else
- __set_fixmap(FIX_ISAMAP_BEGIN - next,
- virt_to_mfn(empty_zero_page) <<
PAGE_SHIFT,
- PAGE_KERNEL_RO);
-
- BUG_ON(start_pfn > table_end);
- table_end = start_pfn;
+ xen_finish_init_mapping();
}
__flush_tlb_all();
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