pgtsrmmu.h
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上传日期:2013-02-24
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- /* $Id: pgtsrmmu.h,v 1.31 2000/07/16 21:48:52 anton Exp $
- * 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>
- /* PMD_SHIFT determines the size of the area a second-level page table can map */
- #define SRMMU_PMD_SHIFT 18
- #define SRMMU_PMD_SIZE (1UL << SRMMU_PMD_SHIFT)
- #define SRMMU_PMD_MASK (~(SRMMU_PMD_SIZE-1))
- #define SRMMU_PMD_ALIGN(addr) (((addr)+SRMMU_PMD_SIZE-1)&SRMMU_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_PTRS_PER_PTE 64
- #define SRMMU_PTRS_PER_PMD 64
- #define SRMMU_PTRS_PER_PGD 256
- #define SRMMU_PTE_TABLE_SIZE 0x100 /* 64 entries, 4 bytes a piece */
- #define SRMMU_PMD_TABLE_SIZE 0x100 /* 64 entries, 4 bytes a piece */
- #define SRMMU_PGD_TABLE_SIZE 0x400 /* 256 entries, 4 bytes a piece */
- /* 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_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)
- /* 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_VALID | 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 + AOFF_task_thread + AOFF_thread_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__
- /* Accessing the MMU control register. */
- extern __inline__ unsigned int srmmu_get_mmureg(void)
- {
- unsigned int retval;
- __asm__ __volatile__("lda [%%g0] %1, %0nt" :
- "=r" (retval) :
- "i" (ASI_M_MMUREGS));
- return retval;
- }
- extern __inline__ void srmmu_set_mmureg(unsigned long regval)
- {
- __asm__ __volatile__("sta %0, [%%g0] %1nt" : :
- "r" (regval), "i" (ASI_M_MMUREGS) : "memory");
- }
- extern __inline__ void srmmu_set_ctable_ptr(unsigned long paddr)
- {
- paddr = ((paddr >> 4) & SRMMU_CTX_PMASK);
- __asm__ __volatile__("sta %0, [%1] %2nt" : :
- "r" (paddr), "r" (SRMMU_CTXTBL_PTR),
- "i" (ASI_M_MMUREGS) :
- "memory");
- }
- extern __inline__ unsigned long srmmu_get_ctable_ptr(void)
- {
- unsigned int retval;
- __asm__ __volatile__("lda [%1] %2, %0nt" :
- "=r" (retval) :
- "r" (SRMMU_CTXTBL_PTR),
- "i" (ASI_M_MMUREGS));
- return (retval & SRMMU_CTX_PMASK) << 4;
- }
- extern __inline__ void srmmu_set_context(int context)
- {
- __asm__ __volatile__("sta %0, [%1] %2nt" : :
- "r" (context), "r" (SRMMU_CTX_REG),
- "i" (ASI_M_MMUREGS) : "memory");
- }
- extern __inline__ int srmmu_get_context(void)
- {
- register int retval;
- __asm__ __volatile__("lda [%1] %2, %0nt" :
- "=r" (retval) :
- "r" (SRMMU_CTX_REG),
- "i" (ASI_M_MMUREGS));
- return retval;
- }
- extern __inline__ unsigned int srmmu_get_fstatus(void)
- {
- unsigned int retval;
- __asm__ __volatile__("lda [%1] %2, %0nt" :
- "=r" (retval) :
- "r" (SRMMU_FAULT_STATUS), "i" (ASI_M_MMUREGS));
- return retval;
- }
- extern __inline__ unsigned int srmmu_get_faddr(void)
- {
- unsigned int retval;
- __asm__ __volatile__("lda [%1] %2, %0nt" :
- "=r" (retval) :
- "r" (SRMMU_FAULT_ADDR), "i" (ASI_M_MMUREGS));
- return retval;
- }
- /* This is guaranteed on all SRMMU's. */
- extern __inline__ void srmmu_flush_whole_tlb(void)
- {
- __asm__ __volatile__("sta %%g0, [%0] %1nt": :
- "r" (0x400), /* Flush entire TLB!! */
- "i" (ASI_M_FLUSH_PROBE) : "memory");
- }
- /* These flush types are not available on all chips... */
- extern __inline__ void srmmu_flush_tlb_ctx(void)
- {
- __asm__ __volatile__("sta %%g0, [%0] %1nt": :
- "r" (0x300), /* Flush TLB ctx.. */
- "i" (ASI_M_FLUSH_PROBE) : "memory");
- }
- extern __inline__ void srmmu_flush_tlb_region(unsigned long addr)
- {
- addr &= SRMMU_PGDIR_MASK;
- __asm__ __volatile__("sta %%g0, [%0] %1nt": :
- "r" (addr | 0x200), /* Flush TLB region.. */
- "i" (ASI_M_FLUSH_PROBE) : "memory");
- }
- extern __inline__ void srmmu_flush_tlb_segment(unsigned long addr)
- {
- addr &= SRMMU_PMD_MASK;
- __asm__ __volatile__("sta %%g0, [%0] %1nt": :
- "r" (addr | 0x100), /* Flush TLB segment.. */
- "i" (ASI_M_FLUSH_PROBE) : "memory");
- }
- extern __inline__ void srmmu_flush_tlb_page(unsigned long page)
- {
- page &= PAGE_MASK;
- __asm__ __volatile__("sta %%g0, [%0] %1nt": :
- "r" (page), /* Flush TLB page.. */
- "i" (ASI_M_FLUSH_PROBE) : "memory");
- }
- extern __inline__ unsigned long srmmu_hwprobe(unsigned long vaddr)
- {
- unsigned long retval;
- vaddr &= PAGE_MASK;
- __asm__ __volatile__("lda [%1] %2, %0nt" :
- "=r" (retval) :
- "r" (vaddr | 0x400), "i" (ASI_M_FLUSH_PROBE));
- return retval;
- }
- extern __inline__ int
- srmmu_get_pte (unsigned long addr)
- {
- register unsigned long entry;
-
- __asm__ __volatile__("ntlda [%1] %2,%0nt" :
- "=r" (entry):
- "r" ((addr & 0xfffff000) | 0x400), "i" (ASI_M_FLUSH_PROBE));
- return entry;
- }
- extern unsigned long (*srmmu_read_physical)(unsigned long paddr);
- extern void (*srmmu_write_physical)(unsigned long paddr, unsigned long word);
- #endif /* !(__ASSEMBLY__) */
- #endif /* !(_SPARC_PGTSRMMU_H) */