arch/sparc/include/asm/pgtsrmmu.h - kernel/lockdown - Git at Google

 /*
  * pgtsrmmu.h:  SRMMU page table defines and code.
  *
  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
  */

 #ifndef _SPARC_PGTSRMMU_H
 #define _SPARC_PGTSRMMU_H

 #include <asm/page.h>

 #ifdef __ASSEMBLY__
 #include <asm/thread_info.h>	/* TI_UWINMASK for WINDOW_FLUSH */
 #endif

 /* Number of contexts is implementation-dependent; 64k is the most we support */
 #define SRMMU_MAX_CONTEXTS	65536

 /* PMD_SHIFT determines the size of the area a second-level page table entry can map */
 #define SRMMU_REAL_PMD_SHIFT		18
 #define SRMMU_REAL_PMD_SIZE		(1UL << SRMMU_REAL_PMD_SHIFT)
 #define SRMMU_REAL_PMD_MASK		(~(SRMMU_REAL_PMD_SIZE-1))
 #define SRMMU_REAL_PMD_ALIGN(__addr)	(((__addr)+SRMMU_REAL_PMD_SIZE-1)&SRMMU_REAL_PMD_MASK)

 /* PGDIR_SHIFT determines what a third-level page table entry can map */
 #define SRMMU_PGDIR_SHIFT       24
 #define SRMMU_PGDIR_SIZE        (1UL << SRMMU_PGDIR_SHIFT)
 #define SRMMU_PGDIR_MASK        (~(SRMMU_PGDIR_SIZE-1))
 #define SRMMU_PGDIR_ALIGN(addr) (((addr)+SRMMU_PGDIR_SIZE-1)&SRMMU_PGDIR_MASK)

 #define SRMMU_REAL_PTRS_PER_PTE	64
 #define SRMMU_REAL_PTRS_PER_PMD	64
 #define SRMMU_PTRS_PER_PGD	256

 #define SRMMU_REAL_PTE_TABLE_SIZE	(SRMMU_REAL_PTRS_PER_PTE*4)
 #define SRMMU_PMD_TABLE_SIZE		(SRMMU_REAL_PTRS_PER_PMD*4)
 #define SRMMU_PGD_TABLE_SIZE		(SRMMU_PTRS_PER_PGD*4)

 /*
  * To support pagetables in highmem, Linux introduces APIs which
  * return struct page* and generally manipulate page tables when
  * they are not mapped into kernel space. Our hardware page tables
  * are smaller than pages. We lump hardware tabes into big, page sized
  * software tables.
  *
  * PMD_SHIFT determines the size of the area a second-level page table entry
  * can map, and our pmd_t is 16 times larger than normal.  The values which
  * were once defined here are now generic for 4c and srmmu, so they're
  * found in pgtable.h.
  */
 #define SRMMU_PTRS_PER_PMD	4

 /* Definition of the values in the ET field of PTD's and PTE's */
 #define SRMMU_ET_MASK         0x3
 #define SRMMU_ET_INVALID      0x0
 #define SRMMU_ET_PTD          0x1
 #define SRMMU_ET_PTE          0x2
 #define SRMMU_ET_REPTE        0x3 /* AIEEE, SuperSparc II reverse endian page! */

 /* Physical page extraction from PTP's and PTE's. */
 #define SRMMU_CTX_PMASK    0xfffffff0
 #define SRMMU_PTD_PMASK    0xfffffff0
 #define SRMMU_PTE_PMASK    0xffffff00

 /* The pte non-page bits.  Some notes:
  * 1) cache, dirty, valid, and ref are frobbable
  *    for both supervisor and user pages.
  * 2) exec and write will only give the desired effect
  *    on user pages
  * 3) use priv and priv_readonly for changing the
  *    characteristics of supervisor ptes
  */
 #define SRMMU_CACHE        0x80
 #define SRMMU_DIRTY        0x40
 #define SRMMU_REF          0x20
 #define SRMMU_NOREAD       0x10
 #define SRMMU_EXEC         0x08
 #define SRMMU_WRITE        0x04
 #define SRMMU_VALID        0x02 /* SRMMU_ET_PTE */
 #define SRMMU_PRIV         0x1c
 #define SRMMU_PRIV_RDONLY  0x18

 #define SRMMU_CHG_MASK    (0xffffff00 | SRMMU_REF | SRMMU_DIRTY)

 /* SRMMU swap entry encoding
  *
  * We use 5 bits for the type and 19 for the offset.  This gives us
  * 32 swapfiles of 4GB each.  Encoding looks like:
  *
  * oooooooooooooooooootttttRRRRRRRR
  * fedcba9876543210fedcba9876543210
  *
  * The bottom 7 bits are reserved for protection and status bits, especially
  * PRESENT.
  */
 #define SRMMU_SWP_TYPE_MASK	0x1f
 #define SRMMU_SWP_TYPE_SHIFT	7
 #define SRMMU_SWP_OFF_MASK	0xfffff
 #define SRMMU_SWP_OFF_SHIFT	(SRMMU_SWP_TYPE_SHIFT + 5)

 /* Some day I will implement true fine grained access bits for
  * user pages because the SRMMU gives us the capabilities to
  * enforce all the protection levels that vma's can have.
  * XXX But for now...
  */
 #define SRMMU_PAGE_NONE    __pgprot(SRMMU_CACHE | \
 				    SRMMU_PRIV | SRMMU_REF)
 #define SRMMU_PAGE_SHARED  __pgprot(SRMMU_VALID | SRMMU_CACHE | \
 				    SRMMU_EXEC | SRMMU_WRITE | SRMMU_REF)
 #define SRMMU_PAGE_COPY    __pgprot(SRMMU_VALID | SRMMU_CACHE | \
 				    SRMMU_EXEC | SRMMU_REF)
 #define SRMMU_PAGE_RDONLY  __pgprot(SRMMU_VALID | SRMMU_CACHE | \
 				    SRMMU_EXEC | SRMMU_REF)
 #define SRMMU_PAGE_KERNEL  __pgprot(SRMMU_VALID | SRMMU_CACHE | SRMMU_PRIV | \
 				    SRMMU_DIRTY | SRMMU_REF)

 /* SRMMU Register addresses in ASI 0x4.  These are valid for all
  * current SRMMU implementations that exist.
  */
 #define SRMMU_CTRL_REG           0x00000000
 #define SRMMU_CTXTBL_PTR         0x00000100
 #define SRMMU_CTX_REG            0x00000200
 #define SRMMU_FAULT_STATUS       0x00000300
 #define SRMMU_FAULT_ADDR         0x00000400

 #define WINDOW_FLUSH(tmp1, tmp2)					\
 	mov	0, tmp1;						\
 98:	ld	[%g6 + TI_UWINMASK], tmp2;				\
 	orcc	%g0, tmp2, %g0;						\
 	add	tmp1, 1, tmp1;						\
 	bne	98b;							\
 	 save	%sp, -64, %sp;						\
 99:	subcc	tmp1, 1, tmp1;						\
 	bne	99b;							\
 	 restore %g0, %g0, %g0;

 #ifndef __ASSEMBLY__
 extern unsigned long last_valid_pfn;

 /* This makes sense. Honest it does - Anton */
 /* XXX Yes but it's ugly as sin.  FIXME. -KMW */
 extern void *srmmu_nocache_pool;
 #define __nocache_pa(VADDR) (((unsigned long)VADDR) - SRMMU_NOCACHE_VADDR + __pa((unsigned long)srmmu_nocache_pool))
 #define __nocache_va(PADDR) (__va((unsigned long)PADDR) - (unsigned long)srmmu_nocache_pool + SRMMU_NOCACHE_VADDR)
 #define __nocache_fix(VADDR) __va(__nocache_pa(VADDR))

 /* Accessing the MMU control register. */
 unsigned int srmmu_get_mmureg(void);
 void srmmu_set_mmureg(unsigned long regval);
 void srmmu_set_ctable_ptr(unsigned long paddr);
 void srmmu_set_context(int context);
 int srmmu_get_context(void);
 unsigned int srmmu_get_fstatus(void);
 unsigned int srmmu_get_faddr(void);

 /* This is guaranteed on all SRMMU's. */
 static inline void srmmu_flush_whole_tlb(void)
 {
 	__asm__ __volatile__("sta %%g0, [%0] %1\n\t": :
 			     "r" (0x400),        /* Flush entire TLB!! */
 			     "i" (ASI_M_FLUSH_PROBE) : "memory");

 }

 static inline int
 srmmu_get_pte (unsigned long addr)
 {
 	register unsigned long entry;

 	__asm__ __volatile__("\n\tlda [%1] %2,%0\n\t" :
 				"=r" (entry):
 				"r" ((addr & 0xfffff000) | 0x400), "i" (ASI_M_FLUSH_PROBE));
 	return entry;
 }

 #endif /* !(__ASSEMBLY__) */

 #endif /* !(_SPARC_PGTSRMMU_H) */
	/*
	* pgtsrmmu.h: SRMMU page table defines and code.
	*
	* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
	*/

	#ifndef _SPARC_PGTSRMMU_H
	#define _SPARC_PGTSRMMU_H

	#include <asm/page.h>

	#ifdef __ASSEMBLY__
	#include <asm/thread_info.h> /* TI_UWINMASK for WINDOW_FLUSH */
	#endif

	/* Number of contexts is implementation-dependent; 64k is the most we support */
	#define SRMMU_MAX_CONTEXTS 65536

	/* PMD_SHIFT determines the size of the area a second-level page table entry can map */
	#define SRMMU_REAL_PMD_SHIFT 18
	#define SRMMU_REAL_PMD_SIZE (1UL << SRMMU_REAL_PMD_SHIFT)
	#define SRMMU_REAL_PMD_MASK (~(SRMMU_REAL_PMD_SIZE-1))
	#define SRMMU_REAL_PMD_ALIGN(__addr) (((__addr)+SRMMU_REAL_PMD_SIZE-1)&SRMMU_REAL_PMD_MASK)

	/* PGDIR_SHIFT determines what a third-level page table entry can map */
	#define SRMMU_PGDIR_SHIFT 24
	#define SRMMU_PGDIR_SIZE (1UL << SRMMU_PGDIR_SHIFT)
	#define SRMMU_PGDIR_MASK (~(SRMMU_PGDIR_SIZE-1))
	#define SRMMU_PGDIR_ALIGN(addr) (((addr)+SRMMU_PGDIR_SIZE-1)&SRMMU_PGDIR_MASK)

	#define SRMMU_REAL_PTRS_PER_PTE 64
	#define SRMMU_REAL_PTRS_PER_PMD 64
	#define SRMMU_PTRS_PER_PGD 256

	#define SRMMU_REAL_PTE_TABLE_SIZE (SRMMU_REAL_PTRS_PER_PTE*4)
	#define SRMMU_PMD_TABLE_SIZE (SRMMU_REAL_PTRS_PER_PMD*4)
	#define SRMMU_PGD_TABLE_SIZE (SRMMU_PTRS_PER_PGD*4)

	/*
	* To support pagetables in highmem, Linux introduces APIs which
	* return struct page* and generally manipulate page tables when
	* they are not mapped into kernel space. Our hardware page tables
	* are smaller than pages. We lump hardware tabes into big, page sized
	* software tables.
	*
	* PMD_SHIFT determines the size of the area a second-level page table entry
	* can map, and our pmd_t is 16 times larger than normal. The values which
	* were once defined here are now generic for 4c and srmmu, so they're
	* found in pgtable.h.
	*/
	#define SRMMU_PTRS_PER_PMD 4

	/* Definition of the values in the ET field of PTD's and PTE's */
	#define SRMMU_ET_MASK 0x3
	#define SRMMU_ET_INVALID 0x0
	#define SRMMU_ET_PTD 0x1
	#define SRMMU_ET_PTE 0x2
	#define SRMMU_ET_REPTE 0x3 /* AIEEE, SuperSparc II reverse endian page! */

	/* Physical page extraction from PTP's and PTE's. */
	#define SRMMU_CTX_PMASK 0xfffffff0
	#define SRMMU_PTD_PMASK 0xfffffff0
	#define SRMMU_PTE_PMASK 0xffffff00

	/* The pte non-page bits. Some notes:
	* 1) cache, dirty, valid, and ref are frobbable
	* for both supervisor and user pages.
	* 2) exec and write will only give the desired effect
	* on user pages
	* 3) use priv and priv_readonly for changing the
	* characteristics of supervisor ptes
	*/
	#define SRMMU_CACHE 0x80
	#define SRMMU_DIRTY 0x40
	#define SRMMU_REF 0x20
	#define SRMMU_NOREAD 0x10
	#define SRMMU_EXEC 0x08
	#define SRMMU_WRITE 0x04
	#define SRMMU_VALID 0x02 /* SRMMU_ET_PTE */
	#define SRMMU_PRIV 0x1c
	#define SRMMU_PRIV_RDONLY 0x18

	#define SRMMU_CHG_MASK (0xffffff00 \| SRMMU_REF \| SRMMU_DIRTY)

	/* SRMMU swap entry encoding
	*
	* We use 5 bits for the type and 19 for the offset. This gives us
	* 32 swapfiles of 4GB each. Encoding looks like:
	*
	* oooooooooooooooooootttttRRRRRRRR
	* fedcba9876543210fedcba9876543210
	*
	* The bottom 7 bits are reserved for protection and status bits, especially
	* PRESENT.
	*/
	#define SRMMU_SWP_TYPE_MASK 0x1f
	#define SRMMU_SWP_TYPE_SHIFT 7
	#define SRMMU_SWP_OFF_MASK 0xfffff
	#define SRMMU_SWP_OFF_SHIFT (SRMMU_SWP_TYPE_SHIFT + 5)

	/* Some day I will implement true fine grained access bits for
	* user pages because the SRMMU gives us the capabilities to
	* enforce all the protection levels that vma's can have.
	* XXX But for now...
	*/
	#define SRMMU_PAGE_NONE __pgprot(SRMMU_CACHE \| \
	SRMMU_PRIV \| SRMMU_REF)
	#define SRMMU_PAGE_SHARED __pgprot(SRMMU_VALID \| SRMMU_CACHE \| \
	SRMMU_EXEC \| SRMMU_WRITE \| SRMMU_REF)
	#define SRMMU_PAGE_COPY __pgprot(SRMMU_VALID \| SRMMU_CACHE \| \
	SRMMU_EXEC \| SRMMU_REF)
	#define SRMMU_PAGE_RDONLY __pgprot(SRMMU_VALID \| SRMMU_CACHE \| \
	SRMMU_EXEC \| SRMMU_REF)
	#define SRMMU_PAGE_KERNEL __pgprot(SRMMU_VALID \| SRMMU_CACHE \| SRMMU_PRIV \| \
	SRMMU_DIRTY \| SRMMU_REF)

	/* SRMMU Register addresses in ASI 0x4. These are valid for all
	* current SRMMU implementations that exist.
	*/
	#define SRMMU_CTRL_REG 0x00000000
	#define SRMMU_CTXTBL_PTR 0x00000100
	#define SRMMU_CTX_REG 0x00000200
	#define SRMMU_FAULT_STATUS 0x00000300
	#define SRMMU_FAULT_ADDR 0x00000400

	#define WINDOW_FLUSH(tmp1, tmp2) \
	mov 0, tmp1; \
	98: ld [%g6 + TI_UWINMASK], tmp2; \
	orcc %g0, tmp2, %g0; \
	add tmp1, 1, tmp1; \
	bne 98b; \
	save %sp, -64, %sp; \
	99: subcc tmp1, 1, tmp1; \
	bne 99b; \
	restore %g0, %g0, %g0;

	#ifndef __ASSEMBLY__
	extern unsigned long last_valid_pfn;

	/* This makes sense. Honest it does - Anton */
	/* XXX Yes but it's ugly as sin. FIXME. -KMW */
	extern void *srmmu_nocache_pool;
	#define __nocache_pa(VADDR) (((unsigned long)VADDR) - SRMMU_NOCACHE_VADDR + __pa((unsigned long)srmmu_nocache_pool))
	#define __nocache_va(PADDR) (__va((unsigned long)PADDR) - (unsigned long)srmmu_nocache_pool + SRMMU_NOCACHE_VADDR)
	#define __nocache_fix(VADDR) __va(__nocache_pa(VADDR))

	/* Accessing the MMU control register. */
	unsigned int srmmu_get_mmureg(void);
	void srmmu_set_mmureg(unsigned long regval);
	void srmmu_set_ctable_ptr(unsigned long paddr);
	void srmmu_set_context(int context);
	int srmmu_get_context(void);
	unsigned int srmmu_get_fstatus(void);
	unsigned int srmmu_get_faddr(void);

	/* This is guaranteed on all SRMMU's. */
	static inline void srmmu_flush_whole_tlb(void)
	{
	__asm__ __volatile__("sta %%g0, [%0] %1\n\t": :
	"r" (0x400), /* Flush entire TLB!! */
	"i" (ASI_M_FLUSH_PROBE) : "memory");

	}

	static inline int
	srmmu_get_pte (unsigned long addr)
	{
	register unsigned long entry;

	__asm__ __volatile__("\n\tlda [%1] %2,%0\n\t" :
	"=r" (entry):
	"r" ((addr & 0xfffff000) \| 0x400), "i" (ASI_M_FLUSH_PROBE));
	return entry;
	}

	#endif /* !(__ASSEMBLY__) */

	#endif /* !(_SPARC_PGTSRMMU_H) */