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powerpc: Add memory management headers for new 64-bit BookE

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This adds the PTE and pgtable format definitions, along with changes
to the kernel memory map and other definitions related to implementing
support for 64-bit Book3E. This also shields some asm-offset bits that
are currently only relevant on 32-bit

We also move the definition of the "linux" page size constants to
the common mmu.h file and add a few sizes that are relevant to
embedded processors.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2009-07-28 11:59:34 +10:00
parent 0257c99cdf
commit 57e2a99f74
10 changed files with 205 additions and 40 deletions
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27
arch/powerpc/include/asm/mmu-book3e.h
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@ -170,6 +170,33 @@ typedef struct {
unsigned int active;
unsigned long vdso_base;
} mm_context_t;
/* Page size definitions, common between 32 and 64-bit
*
* shift : is the "PAGE_SHIFT" value for that page size
* penc : is the pte encoding mask
*
*/
struct mmu_psize_def
{
unsigned int shift; /* number of bits */
unsigned int enc; /* PTE encoding */
};
extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
/* The page sizes use the same names as 64-bit hash but are
* constants
*/
#if defined(CONFIG_PPC_4K_PAGES)
#define mmu_virtual_psize MMU_PAGE_4K
#elif defined(CONFIG_PPC_64K_PAGES)
#define mmu_virtual_psize MMU_PAGE_64K
#else
#error Unsupported page size
#endif
extern int mmu_linear_psize;
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_POWERPC_MMU_BOOK3E_H_ */

20
arch/powerpc/include/asm/mmu-hash64.h
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@ -138,26 +138,6 @@ struct mmu_psize_def
#endif /* __ASSEMBLY__ */
/*
* The kernel use the constants below to index in the page sizes array.
* The use of fixed constants for this purpose is better for performances
* of the low level hash refill handlers.
*
* A non supported page size has a "shift" field set to 0
*
* Any new page size being implemented can get a new entry in here. Whether
* the kernel will use it or not is a different matter though. The actual page
* size used by hugetlbfs is not defined here and may be made variable
*/
#define MMU_PAGE_4K 0 /* 4K */
#define MMU_PAGE_64K 1 /* 64K */
#define MMU_PAGE_64K_AP 2 /* 64K Admixed (in a 4K segment) */
#define MMU_PAGE_1M 3 /* 1M */
#define MMU_PAGE_16M 4 /* 16M */
#define MMU_PAGE_16G 5 /* 16G */
#define MMU_PAGE_COUNT 6
/*
* Segment sizes.
* These are the values used by hardware in the B field of

37
arch/powerpc/include/asm/mmu.h
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@ -17,6 +17,7 @@
#define MMU_FTR_TYPE_40x ASM_CONST(0x00000004)
#define MMU_FTR_TYPE_44x ASM_CONST(0x00000008)
#define MMU_FTR_TYPE_FSL_E ASM_CONST(0x00000010)
#define MMU_FTR_TYPE_3E ASM_CONST(0x00000020)
/*
* This is individual features
@ -73,6 +74,41 @@ extern void early_init_mmu_secondary(void);
#endif /* !__ASSEMBLY__ */
/* The kernel use the constants below to index in the page sizes array.
* The use of fixed constants for this purpose is better for performances
* of the low level hash refill handlers.
*
* A non supported page size has a "shift" field set to 0
*
* Any new page size being implemented can get a new entry in here. Whether
* the kernel will use it or not is a different matter though. The actual page
* size used by hugetlbfs is not defined here and may be made variable
*
* Note: This array ended up being a false good idea as it's growing to the
* point where I wonder if we should replace it with something different,
* to think about, feedback welcome. --BenH.
*/
/* There are #define as they have to be used in assembly
*
* WARNING: If you change this list, make sure to update the array of
* names currently in arch/powerpc/mm/hugetlbpage.c or bad things will
* happen
*/
#define MMU_PAGE_4K 0
#define MMU_PAGE_16K 1
#define MMU_PAGE_64K 2
#define MMU_PAGE_64K_AP 3 /* "Admixed pages" (hash64 only) */
#define MMU_PAGE_256K 4
#define MMU_PAGE_1M 5
#define MMU_PAGE_8M 6
#define MMU_PAGE_16M 7
#define MMU_PAGE_256M 8
#define MMU_PAGE_1G 9
#define MMU_PAGE_16G 10
#define MMU_PAGE_64G 11
#define MMU_PAGE_COUNT 12
#if defined(CONFIG_PPC_STD_MMU_64)
/* 64-bit classic hash table MMU */
@ -94,5 +130,6 @@ extern void early_init_mmu_secondary(void);
# include <asm/mmu-8xx.h>
#endif
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_MMU_H_ */

4
arch/powerpc/include/asm/page.h
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@ -139,7 +139,11 @@ extern phys_addr_t kernstart_addr;
* Don't compare things with KERNELBASE or PAGE_OFFSET to test for
* "kernelness", use is_kernel_addr() - it should do what you want.
*/
#ifdef CONFIG_PPC_BOOK3E_64
#define is_kernel_addr(x) ((x) >= 0x8000000000000000ul)
#else
#define is_kernel_addr(x) ((x) >= PAGE_OFFSET)
#endif
#ifndef __ASSEMBLY__

10
arch/powerpc/include/asm/page_64.h
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@ -135,12 +135,22 @@ extern void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
#endif /* __ASSEMBLY__ */
#else
#define slice_init()
#ifdef CONFIG_PPC_STD_MMU_64
#define get_slice_psize(mm, addr) ((mm)->context.user_psize)
#define slice_set_user_psize(mm, psize) \
do { \
(mm)->context.user_psize = (psize); \
(mm)->context.sllp = SLB_VSID_USER | mmu_psize_defs[(psize)].sllp; \
} while (0)
#else /* CONFIG_PPC_STD_MMU_64 */
#ifdef CONFIG_PPC_64K_PAGES
#define get_slice_psize(mm, addr) MMU_PAGE_64K
#else /* CONFIG_PPC_64K_PAGES */
#define get_slice_psize(mm, addr) MMU_PAGE_4K
#endif /* !CONFIG_PPC_64K_PAGES */
#define slice_set_user_psize(mm, psize) do { BUG(); } while(0)
#endif /* !CONFIG_PPC_STD_MMU_64 */
#define slice_set_range_psize(mm, start, len, psize) \
slice_set_user_psize((mm), (psize))
#define slice_mm_new_context(mm) 1

61
arch/powerpc/include/asm/pgtable-ppc64.h
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@ -5,11 +5,6 @@
* the ppc64 hashed page table.
*/
#ifndef __ASSEMBLY__
#include <linux/stddef.h>
#include <asm/tlbflush.h>
#endif /* __ASSEMBLY__ */
#ifdef CONFIG_PPC_64K_PAGES
#include <asm/pgtable-ppc64-64k.h>
#else
@ -38,26 +33,46 @@
#endif
/*
* Define the address range of the vmalloc VM area.
* Define the address range of the kernel non-linear virtual area
*/
#define VMALLOC_START ASM_CONST(0xD000000000000000)
#define VMALLOC_SIZE (PGTABLE_RANGE >> 1)
#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
#ifdef CONFIG_PPC_BOOK3E
#define KERN_VIRT_START ASM_CONST(0x8000000000000000)
#else
#define KERN_VIRT_START ASM_CONST(0xD000000000000000)
#endif
#define KERN_VIRT_SIZE PGTABLE_RANGE
/*
* Define the address ranges for MMIO and IO space :
* The vmalloc space starts at the beginning of that region, and
* occupies half of it on hash CPUs and a quarter of it on Book3E
*/
#define VMALLOC_START KERN_VIRT_START
#ifdef CONFIG_PPC_BOOK3E
#define VMALLOC_SIZE (KERN_VIRT_SIZE >> 2)
#else
#define VMALLOC_SIZE (KERN_VIRT_SIZE >> 1)
#endif
#define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
/*
* The second half of the kernel virtual space is used for IO mappings,
* it's itself carved into the PIO region (ISA and PHB IO space) and
* the ioremap space
*
* ISA_IO_BASE = VMALLOC_END, 64K reserved area
* ISA_IO_BASE = KERN_IO_START, 64K reserved area
* PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
* IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
*/
#define KERN_IO_START (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
#define FULL_IO_SIZE 0x80000000ul
#define ISA_IO_BASE (VMALLOC_END)
#define ISA_IO_END (VMALLOC_END + 0x10000ul)
#define ISA_IO_BASE (KERN_IO_START)
#define ISA_IO_END (KERN_IO_START + 0x10000ul)
#define PHB_IO_BASE (ISA_IO_END)
#define PHB_IO_END (VMALLOC_END + FULL_IO_SIZE)
#define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE)
#define IOREMAP_BASE (PHB_IO_END)
#define IOREMAP_END (VMALLOC_START + PGTABLE_RANGE)
#define IOREMAP_END (KERN_VIRT_START + KERN_VIRT_SIZE)
/*
* Region IDs
@ -72,19 +87,28 @@
#define USER_REGION_ID (0UL)
/*
* Defines the address of the vmemap area, in its own region
* Defines the address of the vmemap area, in its own region on
* hash table CPUs and after the vmalloc space on Book3E
*/
#ifdef CONFIG_PPC_BOOK3E
#define VMEMMAP_BASE VMALLOC_END
#define VMEMMAP_END KERN_IO_START
#else
#define VMEMMAP_BASE (VMEMMAP_REGION_ID << REGION_SHIFT)
#endif
#define vmemmap ((struct page *)VMEMMAP_BASE)
/*
* Include the PTE bits definitions
*/
#ifdef CONFIG_PPC_BOOK3S
#include <asm/pte-hash64.h>
#else
#include <asm/pte-book3e.h>
#endif
#include <asm/pte-common.h>
#ifdef CONFIG_PPC_MM_SLICES
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
@ -92,6 +116,9 @@
#ifndef __ASSEMBLY__
#include <linux/stddef.h>
#include <asm/tlbflush.h>
/*
* This is the default implementation of various PTE accessors, it's
* used in all cases except Book3S with 64K pages where we have a

70
arch/powerpc/include/asm/pte-book3e.h Normal file
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@ -0,0 +1,70 @@
#ifndef _ASM_POWERPC_PTE_BOOK3E_H
#define _ASM_POWERPC_PTE_BOOK3E_H
#ifdef __KERNEL__
/* PTE bit definitions for processors compliant to the Book3E
* architecture 2.06 or later. The position of the PTE bits
* matches the HW definition of the optional Embedded Page Table
* category.
*/
/* Architected bits */
#define _PAGE_PRESENT 0x000001 /* software: pte contains a translation */
#define _PAGE_FILE 0x000002 /* (!present only) software: pte holds file offset */
#define _PAGE_SW1 0x000002
#define _PAGE_BAP_SR 0x000004
#define _PAGE_BAP_UR 0x000008
#define _PAGE_BAP_SW 0x000010
#define _PAGE_BAP_UW 0x000020
#define _PAGE_BAP_SX 0x000040
#define _PAGE_BAP_UX 0x000080
#define _PAGE_PSIZE_MSK 0x000f00
#define _PAGE_PSIZE_4K 0x000200
#define _PAGE_PSIZE_64K 0x000600
#define _PAGE_PSIZE_1M 0x000a00
#define _PAGE_PSIZE_16M 0x000e00
#define _PAGE_DIRTY 0x001000 /* C: page changed */
#define _PAGE_SW0 0x002000
#define _PAGE_U3 0x004000
#define _PAGE_U2 0x008000
#define _PAGE_U1 0x010000
#define _PAGE_U0 0x020000
#define _PAGE_ACCESSED 0x040000
#define _PAGE_LENDIAN 0x080000
#define _PAGE_GUARDED 0x100000
#define _PAGE_COHERENT 0x200000 /* M: enforce memory coherence */
#define _PAGE_NO_CACHE 0x400000 /* I: cache inhibit */
#define _PAGE_WRITETHRU 0x800000 /* W: cache write-through */
/* "Higher level" linux bit combinations */
#define _PAGE_EXEC _PAGE_BAP_SX /* Can be executed from potentially */
#define _PAGE_HWEXEC _PAGE_BAP_UX /* .. and was cache cleaned */
#define _PAGE_RW (_PAGE_BAP_SW | _PAGE_BAP_UW) /* User write permission */
#define _PAGE_KERNEL_RW (_PAGE_BAP_SW | _PAGE_BAP_SR | _PAGE_DIRTY)
#define _PAGE_KERNEL_RO (_PAGE_BAP_SR)
#define _PAGE_USER (_PAGE_BAP_UR | _PAGE_BAP_SR) /* Can be read */
#define _PAGE_HASHPTE 0
#define _PAGE_BUSY 0
#define _PAGE_SPECIAL _PAGE_SW0
/* Flags to be preserved on PTE modifications */
#define _PAGE_HPTEFLAGS _PAGE_BUSY
/* Base page size */
#ifdef CONFIG_PPC_64K_PAGES
#define _PAGE_PSIZE _PAGE_PSIZE_64K
#define PTE_RPN_SHIFT (28)
#else
#define _PAGE_PSIZE _PAGE_PSIZE_4K
#define PTE_RPN_SHIFT (24)
#endif
/* On 32-bit, we never clear the top part of the PTE */
#ifdef CONFIG_PPC32
#define _PTE_NONE_MASK 0xffffffff00000000ULL
#endif
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_PTE_FSL_BOOKE_H */

3
arch/powerpc/include/asm/pte-common.h
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@ -34,6 +34,9 @@
#ifndef _PAGE_4K_PFN
#define _PAGE_4K_PFN 0
#endif
#ifndef _PAGE_SAO
#define _PAGE_SAO 0
#endif
#ifndef _PAGE_PSIZE
#define _PAGE_PSIZE 0
#endif

5
arch/powerpc/kernel/asm-offsets.c
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@ -52,9 +52,11 @@
#include <linux/kvm_host.h>
#endif
#ifdef CONFIG_PPC32
#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
#include "head_booke.h"
#endif
#endif
#if defined(CONFIG_FSL_BOOKE)
#include "../mm/mmu_decl.h"
@ -260,6 +262,7 @@ int main(void)
DEFINE(_SRR1, STACK_FRAME_OVERHEAD+sizeof(struct pt_regs)+8);
#endif /* CONFIG_PPC64 */
#if defined(CONFIG_PPC32)
#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
DEFINE(EXC_LVL_SIZE, STACK_EXC_LVL_FRAME_SIZE);
DEFINE(MAS0, STACK_INT_FRAME_SIZE+offsetof(struct exception_regs, mas0));
@ -278,7 +281,7 @@ int main(void)
DEFINE(_DSRR1, STACK_INT_FRAME_SIZE+offsetof(struct exception_regs, dsrr1));
DEFINE(SAVED_KSP_LIMIT, STACK_INT_FRAME_SIZE+offsetof(struct exception_regs, saved_ksp_limit));
#endif
#endif
DEFINE(CLONE_VM, CLONE_VM);
DEFINE(CLONE_UNTRACED, CLONE_UNTRACED);

8
arch/powerpc/mm/hugetlbpage.c
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@ -57,8 +57,10 @@ unsigned int mmu_huge_psizes[MMU_PAGE_COUNT] = { }; /* initialize all to 0 */
#define HUGEPTE_CACHE_NAME(psize) (huge_pgtable_cache_name[psize])
static const char *huge_pgtable_cache_name[MMU_PAGE_COUNT] = {
"unused_4K", "hugepte_cache_64K", "unused_64K_AP",
"hugepte_cache_1M", "hugepte_cache_16M", "hugepte_cache_16G"
[MMU_PAGE_64K] = "hugepte_cache_64K",
[MMU_PAGE_1M] = "hugepte_cache_1M",
[MMU_PAGE_16M] = "hugepte_cache_16M",
[MMU_PAGE_16G] = "hugepte_cache_16G",
};
/* Flag to mark huge PD pointers. This means pmd_bad() and pud_bad()
@ -700,6 +702,8 @@ static void __init set_huge_psize(int psize)
if (mmu_huge_psizes[psize] ||
mmu_psize_defs[psize].shift == PAGE_SHIFT)
return;
if (WARN_ON(HUGEPTE_CACHE_NAME(psize) == NULL))
return;
hugetlb_add_hstate(mmu_psize_defs[psize].shift - PAGE_SHIFT);
switch (mmu_psize_defs[psize].shift) {