diff options
| author | Matt Fleming <matt.fleming@intel.com> | 2012-09-07 18:23:51 +0100 |
|---|---|---|
| committer | Matt Fleming <matt.fleming@intel.com> | 2012-10-30 10:39:19 +0000 |
| commit | 53b87cf088e2ea68d7c59619d0214cc15bb76133 (patch) | |
| tree | afa920fe2dc6e11dc023147fc6bffafcf19a2508 /arch/x86/mm/init_64.c | |
| parent | e913ca7d16d70b75367ff56a3b201980501d542c (diff) | |
x86, mm: Include the entire kernel memory map in trampoline_pgd
There are various pieces of code in arch/x86 that require a page table
with an identity mapping. Make trampoline_pgd a proper kernel page
table, it currently only includes the kernel text and module space
mapping.
One new feature of trampoline_pgd is that it now has mappings for the
physical I/O device addresses, which are inserted at ioremap()
time. Some broken implementations of EFI firmware require these
mappings to always be around.
Acked-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'arch/x86/mm/init_64.c')
| -rw-r--r-- | arch/x86/mm/init_64.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 2b6b4a3c8beb..fd4404f19d39 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -108,13 +108,13 @@ void sync_global_pgds(unsigned long start, unsigned long end) for (address = start; address <= end; address += PGDIR_SIZE) { const pgd_t *pgd_ref = pgd_offset_k(address); struct page *page; + pgd_t *pgd; if (pgd_none(*pgd_ref)) continue; spin_lock(&pgd_lock); list_for_each_entry(page, &pgd_list, lru) { - pgd_t *pgd; spinlock_t *pgt_lock; pgd = (pgd_t *)page_address(page) + pgd_index(address); @@ -130,6 +130,13 @@ void sync_global_pgds(unsigned long start, unsigned long end) spin_unlock(pgt_lock); } + + pgd = __va(real_mode_header->trampoline_pgd); + pgd += pgd_index(address); + + if (pgd_none(*pgd)) + set_pgd(pgd, *pgd_ref); + spin_unlock(&pgd_lock); } } |