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- /*
- * PowerPC memory management structures
- */
-
- #ifndef _PPC_MMU_H_
- #define _PPC_MMU_H_
-
- #ifndef __ASSEMBLY__
- /* Hardware Page Table Entry */
- typedef struct _PTE {
- unsigned long v:1; /* Entry is valid */
- unsigned long vsid:24; /* Virtual segment identifier */
- unsigned long h:1; /* Hash algorithm indicator */
- unsigned long api:6; /* Abbreviated page index */
- unsigned long rpn:20; /* Real (physical) page number */
- unsigned long :3; /* Unused */
- 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 */
- unsigned long g:1; /* Guarded */
- unsigned long :1; /* Unused */
- unsigned long pp:2; /* Page protection */
- } PTE;
-
- /* Values for PP (assumes Ks=0, Kp=1) */
- #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 */
-
- /* Segment Register */
- typedef struct _SEGREG {
- unsigned long t:1; /* Normal or I/O type */
- unsigned long ks:1; /* Supervisor 'key' (normally 0) */
- unsigned long kp:1; /* User 'key' (normally 1) */
- unsigned long n:1; /* No-execute */
- unsigned long :4; /* Unused */
- unsigned long vsid:24; /* Virtual Segment Identifier */
- } SEGREG;
-
- /* Block Address Translation (BAT) Registers */
- typedef struct _P601_BATU { /* Upper part of BAT for 601 processor */
- unsigned long bepi:15; /* Effective page index (virtual address) */
- unsigned long :8; /* unused */
- unsigned long w:1;
- unsigned long i:1; /* Cache inhibit */
- unsigned long m:1; /* Memory coherence */
- unsigned long ks:1; /* Supervisor key (normally 0) */
- unsigned long kp:1; /* User key (normally 1) */
- unsigned long pp:2; /* Page access protections */
- } P601_BATU;
-
- typedef struct _BATU { /* Upper part of BAT (all except 601) */
- unsigned long bepi:15; /* Effective page index (virtual address) */
- unsigned long :4; /* Unused */
- unsigned long bl:11; /* Block size mask */
- unsigned long vs:1; /* Supervisor valid */
- unsigned long vp:1; /* User valid */
- } BATU;
-
- typedef struct _P601_BATL { /* Lower part of BAT for 601 processor */
- unsigned long brpn:15; /* Real page index (physical address) */
- unsigned long :10; /* Unused */
- unsigned long v:1; /* Valid bit */
- unsigned long bl:6; /* Block size mask */
- } P601_BATL;
-
- typedef struct _BATL { /* Lower part of BAT (all except 601) */
- unsigned long brpn:15; /* Real page index (physical address) */
- unsigned long :10; /* Unused */
- unsigned long w:1; /* Write-thru cache */
- unsigned long i:1; /* Cache inhibit */
- unsigned long m:1; /* Memory coherence */
- unsigned long g:1; /* Guarded (MBZ in IBAT) */
- unsigned long :1; /* Unused */
- unsigned long pp:2; /* Page access protections */
- } BATL;
-
- typedef struct _BAT {
- BATU batu; /* Upper register */
- BATL batl; /* Lower register */
- } BAT;
-
- typedef struct _P601_BAT {
- P601_BATU batu; /* Upper register */
- P601_BATL batl; /* Lower register */
- } P601_BAT;
-
- /*
- * Simulated two-level MMU. This structure is used by the kernel
- * to keep track of MMU mappings and is used to update/maintain
- * the hardware HASH table which is really a cache of mappings.
- *
- * The simulated structures mimic the hardware available on other
- * platforms, notably the 80x86 and 680x0.
- */
-
- typedef struct _pte {
- unsigned long page_num:20;
- unsigned long flags:12; /* Page flags (some unused bits) */
- } pte;
-
- #define PD_SHIFT (10+12) /* Page directory */
- #define PD_MASK 0x02FF
- #define PT_SHIFT (12) /* Page Table */
- #define PT_MASK 0x02FF
- #define PG_SHIFT (12) /* Page Entry */
-
-
- /* MMU context */
-
- typedef struct _MMU_context {
- SEGREG segs[16]; /* Segment registers */
- pte **pmap; /* Two-level page-map structure */
- } MMU_context;
-
- /* invalidate a TLB entry */
- extern inline void _tlbie(unsigned long va)
- {
- asm volatile ("tlbie %0" : : "r"(va));
- }
-
- extern void _tlbia(void); /* invalidate all TLB entries */
-
- #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
-
- /* BAT Access Protection */
- #define BPP_XX 0x00 /* No access */
- #define BPP_RX 0x01 /* Read only */
- #define BPP_RW 0x02 /* Read/write */
-
- /* 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
-
- /* Control/status registers for the MPC8xx.
- * A write operation to these registers causes serialized access.
- * During software tablewalk, the registers used perform mask/shift-add
- * operations when written/read. A TLB entry is created when the Mx_RPN
- * is written, and the contents of several registers are used to
- * create the entry.
- */
- #define MI_CTR 784 /* Instruction TLB control register */
- #define MI_GPM 0x80000000 /* Set domain manager mode */
- #define MI_PPM 0x40000000 /* Set subpage protection */
- #define MI_CIDEF 0x20000000 /* Set cache inhibit when MMU dis */
- #define MI_RSV4I 0x08000000 /* Reserve 4 TLB entries */
- #define MI_PPCS 0x02000000 /* Use MI_RPN prob/priv state */
- #define MI_IDXMASK 0x00001f00 /* TLB index to be loaded */
- #define MI_RESETVAL 0x00000000 /* Value of register at reset */
-
- /* 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 /* _PPC_MMU_H_ */
-