x86, 64bit, mm: Add generic kernel/ident mapping helper

It is simple version for kernel_physical_mapping_init.
it will work to build one page table that will be used later.

Use mapping_info to control
        1. alloc_pg_page method
        2. if PMD is EXEC,
        3. if pgd is with kernel low mapping or ident mapping.

Will use to replace some local versions in kexec, hibernation and etc.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-8-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 74 insertions, 0 deletions

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index d7af907c07f4..9fbb85c8d930 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -56,6 +56,80 @@
 
 #include "mm_internal.h"
 
+static void ident_pmd_init(unsigned long pmd_flag, pmd_t *pmd_page,
+                           unsigned long addr, unsigned long end)
+{
+        addr &= PMD_MASK;
+        for (; addr < end; addr += PMD_SIZE) {
+                pmd_t *pmd = pmd_page + pmd_index(addr);
+
+                if (!pmd_present(*pmd))
+                        set_pmd(pmd, __pmd(addr | pmd_flag));
+        }
+}
+static int ident_pud_init(struct x86_mapping_info *info, pud_t *pud_page,
+                          unsigned long addr, unsigned long end)
+{
+        unsigned long next;
+
+        for (; addr < end; addr = next) {
+                pud_t *pud = pud_page + pud_index(addr);
+                pmd_t *pmd;
+
+                next = (addr & PUD_MASK) + PUD_SIZE;
+                if (next > end)
+                        next = end;
+
+                if (pud_present(*pud)) {
+                        pmd = pmd_offset(pud, 0);
+                        ident_pmd_init(info->pmd_flag, pmd, addr, next);
+                        continue;
+                }
+                pmd = (pmd_t *)info->alloc_pgt_page(info->context);
+                if (!pmd)
+                        return -ENOMEM;
+                ident_pmd_init(info->pmd_flag, pmd, addr, next);
+                set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
+        }
+
+        return 0;
+}
+
+int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page,
+                              unsigned long addr, unsigned long end)
+{
+        unsigned long next;
+        int result;
+        int off = info->kernel_mapping ? pgd_index(__PAGE_OFFSET) : 0;
+
+        for (; addr < end; addr = next) {
+                pgd_t *pgd = pgd_page + pgd_index(addr) + off;
+                pud_t *pud;
+
+                next = (addr & PGDIR_MASK) + PGDIR_SIZE;
+                if (next > end)
+                        next = end;
+
+                if (pgd_present(*pgd)) {
+                        pud = pud_offset(pgd, 0);
+                        result = ident_pud_init(info, pud, addr, next);
+                        if (result)
+                                return result;
+                        continue;
+                }
+
+                pud = (pud_t *)info->alloc_pgt_page(info->context);
+                if (!pud)
+                        return -ENOMEM;
+                result = ident_pud_init(info, pud, addr, next);
+                if (result)
+                        return result;
+                set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE));
+        }
+
+        return 0;
+}
+
 static int __init parse_direct_gbpages_off(char *arg)
 {
         direct_gbpages = 0;