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Date: Tue, 1 Jul 2008 14:45:32 -0500
From: Jack Steiner <steiner@....com>
To: mingo@...e.hu, tglx@...utronix.de
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] - Map UV chipset space - pagetable
Add boot-time function for creating additional 2MB page table entries for
mapping chipset specific cached/uncached ranges.
Signed-off-by: Jack Steiner <steiner@....com>
---
arch/x86/mm/init_64.c | 40 ++++++++++++++++++++++++++++++++++++++++
include/asm-x86/page_64.h | 4 ++++
include/asm-x86/pgtable.h | 2 ++
3 files changed, 46 insertions(+)
Index: linux/arch/x86/mm/init_64.c
===================================================================
--- linux.orig/arch/x86/mm/init_64.c 2008-07-01 14:35:03.000000000 -0500
+++ linux/arch/x86/mm/init_64.c 2008-07-01 14:38:56.000000000 -0500
@@ -198,6 +198,46 @@ set_pte_vaddr(unsigned long vaddr, pte_t
}
/*
+ * Create large page table mappings for a range of physical addresses.
+ */
+static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
+ pgprot_t prot)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK));
+ for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
+ pgd = pgd_offset_k((unsigned long)__va(phys));
+ if (pgd_none(*pgd)) {
+ pud = (pud_t *) spp_getpage();
+ set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE |
+ _PAGE_USER));
+ }
+ pud = pud_offset(pgd, (unsigned long)__va(phys));
+ if (pud_none(*pud)) {
+ pmd = (pmd_t *) spp_getpage();
+ set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
+ _PAGE_USER));
+ }
+ pmd = pmd_offset(pud, phys);
+ BUG_ON(!pmd_none(*pmd));
+ set_pmd(pmd, __pmd(phys | pgprot_val(prot)));
+ }
+}
+
+void __init init_extra_mapping_wb(unsigned long phys, unsigned long size)
+{
+ __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE);
+}
+
+void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
+{
+ __init_extra_mapping(phys, size, PAGE_KERNEL_LARGE_NOCACHE);
+}
+
+/*
* The head.S code sets up the kernel high mapping:
*
* from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
Index: linux/include/asm-x86/pgtable.h
===================================================================
--- linux.orig/include/asm-x86/pgtable.h 2008-07-01 14:35:03.000000000 -0500
+++ linux/include/asm-x86/pgtable.h 2008-07-01 14:35:10.000000000 -0500
@@ -101,6 +101,7 @@ extern pteval_t __PAGE_KERNEL, __PAGE_KE
#define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
#define __PAGE_KERNEL_VSYSCALL_NOCACHE (__PAGE_KERNEL_VSYSCALL | _PAGE_PCD | _PAGE_PWT)
#define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
+#define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
#ifdef CONFIG_X86_32
@@ -118,6 +119,7 @@ extern pteval_t __PAGE_KERNEL, __PAGE_KE
#define PAGE_KERNEL_UC_MINUS MAKE_GLOBAL(__PAGE_KERNEL_UC_MINUS)
#define PAGE_KERNEL_EXEC_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_EXEC_NOCACHE)
#define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
+#define PAGE_KERNEL_LARGE_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_LARGE_NOCACHE)
#define PAGE_KERNEL_LARGE_EXEC MAKE_GLOBAL(__PAGE_KERNEL_LARGE_EXEC)
#define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
#define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
Index: linux/include/asm-x86/page_64.h
===================================================================
--- linux.orig/include/asm-x86/page_64.h 2008-07-01 14:35:03.000000000 -0500
+++ linux/include/asm-x86/page_64.h 2008-07-01 14:35:10.000000000 -0500
@@ -84,6 +84,10 @@ extern unsigned long init_memory_mapping
unsigned long end);
extern void initmem_init(unsigned long start_pfn, unsigned long end_pfn);
+
+extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);
+extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);
+
#endif /* !__ASSEMBLY__ */
#ifdef CONFIG_FLATMEM
--
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