mmu.h
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上传日期:2013-04-10
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文件大小:12k
- /*
- * PowerPC memory management structures
- *
- * Dave Engebretsen & Mike Corrigan <{engebret|mikejc}@us.ibm.com>
- * PPC64 rework.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
- #ifndef _PPC64_MMU_H_
- #define _PPC64_MMU_H_
- #ifndef __ASSEMBLY__
- /* Default "unsigned long" context */
- typedef unsigned long mm_context_t;
- /*
- * Define the size of the cache used for segment table entries. The first
- * entry is used as a cache pointer, therefore the actual number of entries
- * stored is one less than defined here. Do not change this value without
- * considering the impact it will have on the layout of the paca in paca.h.
- */
- #define STAB_CACHE_SIZE 16
- /*
- * Hardware Segment Lookaside Buffer Entry
- * This structure has been padded out to two 64b doublewords (actual SLBE's are
- * 94 bits). This padding facilites use by the segment management
- * instructions.
- */
- typedef struct {
- unsigned long esid: 36; /* Effective segment ID */
- unsigned long resv0:20; /* Reserved */
- unsigned long v: 1; /* Entry valid (v=1) or invalid */
- unsigned long resv1: 1; /* Reserved */
- unsigned long ks: 1; /* Supervisor (privileged) state storage key */
- unsigned long kp: 1; /* Problem state storage key */
- unsigned long n: 1; /* No-execute if n=1 */
- unsigned long resv2: 3; /* padding to a 64b boundary */
- } ste_dword0;
- typedef struct {
- unsigned long vsid: 52; /* Virtual segment ID */
- unsigned long resv0:12; /* Padding to a 64b boundary */
- } ste_dword1;
- typedef struct _STE {
- union {
- unsigned long dword0;
- ste_dword0 dw0;
- } dw0;
- union {
- unsigned long dword1;
- ste_dword1 dw1;
- } dw1;
- } STE;
- typedef struct {
- unsigned long esid: 36; /* Effective segment ID */
- unsigned long v: 1; /* Entry valid (v=1) or invalid */
- unsigned long null1:15; /* padding to a 64b boundary */
- unsigned long index:12; /* Index to select SLB entry. Used by slbmte */
- } slb_dword0;
- typedef struct {
- unsigned long vsid: 52; /* Virtual segment ID */
- unsigned long ks: 1; /* Supervisor (privileged) state storage key */
- unsigned long kp: 1; /* Problem state storage key */
- unsigned long n: 1; /* No-execute if n=1 */
- unsigned long l: 1; /* Virt pages are large (l=1) or 4KB (l=0) */
- unsigned long c: 1; /* Class */
- unsigned long resv0: 7; /* Padding to a 64b boundary */
- } slb_dword1;
- typedef struct _SLBE {
- union {
- unsigned long dword0;
- slb_dword0 dw0;
- } dw0;
- union {
- unsigned long dword1;
- slb_dword1 dw1;
- } dw1;
- } SLBE;
- /*
- * This structure is used in paca.h where the layout depends on the
- * size being 24B.
- */
- typedef struct {
- unsigned long real;
- unsigned long virt;
- unsigned long next_round_robin;
- } STAB;
- /* Hardware Page Table Entry */
- #define HPTES_PER_GROUP 8
- typedef struct {
- unsigned long avpn:57; /* vsid | api == avpn */
- unsigned long : 2; /* Software use */
- unsigned long bolted: 1; /* HPTE is "bolted" */
- unsigned long lock: 1; /* lock on pSeries SMP */
- unsigned long l: 1; /* Virtual page is large (L=1) or 4 KB (L=0) */
- unsigned long h: 1; /* Hash function identifier */
- unsigned long v: 1; /* Valid (v=1) or invalid (v=0) */
- } Hpte_dword0;
- typedef struct {
- unsigned long : 6; /* unused - padding */
- unsigned long ac: 1; /* Address compare */
- unsigned long r: 1; /* Referenced */
- unsigned long c: 1; /* Changed */
- unsigned long w: 1; /* Write-thru cache mode */
- unsigned long i: 1; /* Cache inhibited */
- unsigned long m: 1; /* Memory coherence required */
- unsigned long g: 1; /* Guarded */
- unsigned long n: 1; /* No-execute */
- unsigned long pp: 2; /* Page protection bits 1:2 */
- } Hpte_flags;
- typedef struct {
- unsigned long pp0: 1; /* Page protection bit 0 */
- unsigned long ts: 1; /* Tag set bit */
- unsigned long rpn: 50; /* Real page number */
- unsigned long : 2; /* Reserved */
- unsigned long ac: 1; /* Address compare */
- unsigned long r: 1; /* Referenced */
- unsigned long c: 1; /* Changed */
- unsigned long w: 1; /* Write-thru cache mode */
- unsigned long i: 1; /* Cache inhibited */
- unsigned long m: 1; /* Memory coherence required */
- unsigned long g: 1; /* Guarded */
- unsigned long n: 1; /* No-execute */
- unsigned long pp: 2; /* Page protection bits 1:2 */
- } Hpte_dword1;
- typedef struct {
- char padding[6]; /* padding */
- unsigned long : 6; /* padding */
- unsigned long flags: 10; /* HPTE flags */
- } Hpte_dword1_flags;
- typedef struct _HPTE {
- union {
- unsigned long dword0;
- Hpte_dword0 dw0;
- } dw0;
- union {
- unsigned long dword1;
- Hpte_dword1 dw1;
- Hpte_dword1_flags flags;
- } dw1;
- } HPTE;
- /* Values for PP (assumes Ks=0, Kp=1) */
- /* pp0 will always be 0 for linux */
- #define PP_RWXX 0 /* Supervisor read/write, User none */
- #define PP_RWRX 1 /* Supervisor read/write, User read */
- #define PP_RWRW 2 /* Supervisor read/write, User read/write */
- #define PP_RXRX 3 /* Supervisor read, User read */
- typedef struct {
- HPTE * htab;
- unsigned long htab_num_ptegs;
- unsigned long htab_hash_mask;
- unsigned long next_round_robin;
- unsigned long last_kernel_address;
- } HTAB;
- extern HTAB htab_data;
- void invalidate_hpte( unsigned long slot );
- long select_hpte_slot( unsigned long vpn );
- void create_valid_hpte( unsigned long slot, unsigned long vpn,
- unsigned long prpn, unsigned hash,
- void * ptep, unsigned hpteflags,
- unsigned bolted );
- #define PD_SHIFT (10+12) /* Page directory */
- #define PD_MASK 0x02FF
- #define PT_SHIFT (12) /* Page Table */
- #define PT_MASK 0x02FF
- #define LARGE_PAGE_SHIFT 24
- static inline unsigned long hpt_hash(unsigned long vpn, int large)
- {
- unsigned long vsid;
- unsigned long page;
- if (large) {
- vsid = vpn >> 4;
- page = vpn & 0xf;
- } else {
- vsid = vpn >> 16;
- page = vpn & 0xffff;
- }
- return (vsid & 0x7fffffffff) ^ page;
- }
- #define PG_SHIFT (12) /* Page Entry */
- /*
- * Invalidate a TLB entry. Assumes a context syncronizing
- * instruction preceeded this call (for example taking the
- * TLB lock).
- */
- static inline void _tlbie(unsigned long va, int large)
- {
- asm volatile("ptesync": : :"memory");
- if (large) {
- asm volatile("clrldi %0,%0,16n
- tlbie %0,1" : : "r"(va) : "memory");
- } else {
- asm volatile("clrldi %0,%0,16n
- tlbie %0,0" : : "r"(va) : "memory");
- }
- asm volatile("eieio; tlbsync; ptesync": : :"memory");
- }
-
- #endif /* __ASSEMBLY__ */
- /* Block size masks */
- #define BL_128K 0x000
- #define BL_256K 0x001
- #define BL_512K 0x003
- #define BL_1M 0x007
- #define BL_2M 0x00F
- #define BL_4M 0x01F
- #define BL_8M 0x03F
- #define BL_16M 0x07F
- #define BL_32M 0x0FF
- #define BL_64M 0x1FF
- #define BL_128M 0x3FF
- #define BL_256M 0x7FF
- /* Used to set up SDR1 register */
- #define HASH_TABLE_SIZE_64K 0x00010000
- #define HASH_TABLE_SIZE_128K 0x00020000
- #define HASH_TABLE_SIZE_256K 0x00040000
- #define HASH_TABLE_SIZE_512K 0x00080000
- #define HASH_TABLE_SIZE_1M 0x00100000
- #define HASH_TABLE_SIZE_2M 0x00200000
- #define HASH_TABLE_SIZE_4M 0x00400000
- #define HASH_TABLE_MASK_64K 0x000
- #define HASH_TABLE_MASK_128K 0x001
- #define HASH_TABLE_MASK_256K 0x003
- #define HASH_TABLE_MASK_512K 0x007
- #define HASH_TABLE_MASK_1M 0x00F
- #define HASH_TABLE_MASK_2M 0x01F
- #define HASH_TABLE_MASK_4M 0x03F
- /* These are the Ks and Kp from the PowerPC books. For proper operation,
- * Ks = 0, Kp = 1.
- */
- #define MI_AP 786
- #define MI_Ks 0x80000000 /* Should not be set */
- #define MI_Kp 0x40000000 /* Should always be set */
- /* The effective page number register. When read, contains the information
- * about the last instruction TLB miss. When MI_RPN is written, bits in
- * this register are used to create the TLB entry.
- */
- #define MI_EPN 787
- #define MI_EPNMASK 0xfffff000 /* Effective page number for entry */
- #define MI_EVALID 0x00000200 /* Entry is valid */
- #define MI_ASIDMASK 0x0000000f /* ASID match value */
- /* Reset value is undefined */
- /* A "level 1" or "segment" or whatever you want to call it register.
- * For the instruction TLB, it contains bits that get loaded into the
- * TLB entry when the MI_RPN is written.
- */
- #define MI_TWC 789
- #define MI_APG 0x000001e0 /* Access protection group (0) */
- #define MI_GUARDED 0x00000010 /* Guarded storage */
- #define MI_PSMASK 0x0000000c /* Mask of page size bits */
- #define MI_PS8MEG 0x0000000c /* 8M page size */
- #define MI_PS512K 0x00000004 /* 512K page size */
- #define MI_PS4K_16K 0x00000000 /* 4K or 16K page size */
- #define MI_SVALID 0x00000001 /* Segment entry is valid */
- /* Reset value is undefined */
- /* Real page number. Defined by the pte. Writing this register
- * causes a TLB entry to be created for the instruction TLB, using
- * additional information from the MI_EPN, and MI_TWC registers.
- */
- #define MI_RPN 790
- /* Define an RPN value for mapping kernel memory to large virtual
- * pages for boot initialization. This has real page number of 0,
- * large page size, shared page, cache enabled, and valid.
- * Also mark all subpages valid and write access.
- */
- #define MI_BOOTINIT 0x000001fd
- #define MD_CTR 792 /* Data TLB control register */
- #define MD_GPM 0x80000000 /* Set domain manager mode */
- #define MD_PPM 0x40000000 /* Set subpage protection */
- #define MD_CIDEF 0x20000000 /* Set cache inhibit when MMU dis */
- #define MD_WTDEF 0x10000000 /* Set writethrough when MMU dis */
- #define MD_RSV4I 0x08000000 /* Reserve 4 TLB entries */
- #define MD_TWAM 0x04000000 /* Use 4K page hardware assist */
- #define MD_PPCS 0x02000000 /* Use MI_RPN prob/priv state */
- #define MD_IDXMASK 0x00001f00 /* TLB index to be loaded */
- #define MD_RESETVAL 0x04000000 /* Value of register at reset */
- #define M_CASID 793 /* Address space ID (context) to match */
- #define MC_ASIDMASK 0x0000000f /* Bits used for ASID value */
- /* These are the Ks and Kp from the PowerPC books. For proper operation,
- * Ks = 0, Kp = 1.
- */
- #define MD_AP 794
- #define MD_Ks 0x80000000 /* Should not be set */
- #define MD_Kp 0x40000000 /* Should always be set */
- /* The effective page number register. When read, contains the information
- * about the last instruction TLB miss. When MD_RPN is written, bits in
- * this register are used to create the TLB entry.
- */
- #define MD_EPN 795
- #define MD_EPNMASK 0xfffff000 /* Effective page number for entry */
- #define MD_EVALID 0x00000200 /* Entry is valid */
- #define MD_ASIDMASK 0x0000000f /* ASID match value */
- /* Reset value is undefined */
- /* The pointer to the base address of the first level page table.
- * During a software tablewalk, reading this register provides the address
- * of the entry associated with MD_EPN.
- */
- #define M_TWB 796
- #define M_L1TB 0xfffff000 /* Level 1 table base address */
- #define M_L1INDX 0x00000ffc /* Level 1 index, when read */
- /* Reset value is undefined */
- /* A "level 1" or "segment" or whatever you want to call it register.
- * For the data TLB, it contains bits that get loaded into the TLB entry
- * when the MD_RPN is written. It is also provides the hardware assist
- * for finding the PTE address during software tablewalk.
- */
- #define MD_TWC 797
- #define MD_L2TB 0xfffff000 /* Level 2 table base address */
- #define MD_L2INDX 0xfffffe00 /* Level 2 index (*pte), when read */
- #define MD_APG 0x000001e0 /* Access protection group (0) */
- #define MD_GUARDED 0x00000010 /* Guarded storage */
- #define MD_PSMASK 0x0000000c /* Mask of page size bits */
- #define MD_PS8MEG 0x0000000c /* 8M page size */
- #define MD_PS512K 0x00000004 /* 512K page size */
- #define MD_PS4K_16K 0x00000000 /* 4K or 16K page size */
- #define MD_WT 0x00000002 /* Use writethrough page attribute */
- #define MD_SVALID 0x00000001 /* Segment entry is valid */
- /* Reset value is undefined */
- /* Real page number. Defined by the pte. Writing this register
- * causes a TLB entry to be created for the data TLB, using
- * additional information from the MD_EPN, and MD_TWC registers.
- */
- #define MD_RPN 798
- /* This is a temporary storage register that could be used to save
- * a processor working register during a tablewalk.
- */
- #define M_TW 799
- #endif /* _PPC64_MMU_H_ */