f22ed71cd6
The LEON MMU Model (SRMMU) does not implement MMu Table probing in hardware, instead it is implemented in software. However the software implementation does not return the PTE as it should which always results in INVALID entires and the PROM mappings are not inherited as they should during startup. The following patch removes the masking of the PTE. Signed-off-by: Daniel Hellstrom <daniel@gaisler.com> Signed-off-by: David S. Miller <davem@davemloft.net>
303 lines
9.0 KiB
C
303 lines
9.0 KiB
C
/*
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* pgtsrmmu.h: SRMMU page table defines and code.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#ifndef _SPARC_PGTSRMMU_H
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#define _SPARC_PGTSRMMU_H
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#include <asm/page.h>
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#ifdef __ASSEMBLY__
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#include <asm/thread_info.h> /* TI_UWINMASK for WINDOW_FLUSH */
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#endif
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/* Number of contexts is implementation-dependent; 64k is the most we support */
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#define SRMMU_MAX_CONTEXTS 65536
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/* PMD_SHIFT determines the size of the area a second-level page table entry can map */
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#define SRMMU_REAL_PMD_SHIFT 18
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#define SRMMU_REAL_PMD_SIZE (1UL << SRMMU_REAL_PMD_SHIFT)
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#define SRMMU_REAL_PMD_MASK (~(SRMMU_REAL_PMD_SIZE-1))
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#define SRMMU_REAL_PMD_ALIGN(__addr) (((__addr)+SRMMU_REAL_PMD_SIZE-1)&SRMMU_REAL_PMD_MASK)
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/* PGDIR_SHIFT determines what a third-level page table entry can map */
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#define SRMMU_PGDIR_SHIFT 24
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#define SRMMU_PGDIR_SIZE (1UL << SRMMU_PGDIR_SHIFT)
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#define SRMMU_PGDIR_MASK (~(SRMMU_PGDIR_SIZE-1))
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#define SRMMU_PGDIR_ALIGN(addr) (((addr)+SRMMU_PGDIR_SIZE-1)&SRMMU_PGDIR_MASK)
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#define SRMMU_REAL_PTRS_PER_PTE 64
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#define SRMMU_REAL_PTRS_PER_PMD 64
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#define SRMMU_PTRS_PER_PGD 256
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#define SRMMU_REAL_PTE_TABLE_SIZE (SRMMU_REAL_PTRS_PER_PTE*4)
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#define SRMMU_PMD_TABLE_SIZE (SRMMU_REAL_PTRS_PER_PMD*4)
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#define SRMMU_PGD_TABLE_SIZE (SRMMU_PTRS_PER_PGD*4)
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/*
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* To support pagetables in highmem, Linux introduces APIs which
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* return struct page* and generally manipulate page tables when
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* they are not mapped into kernel space. Our hardware page tables
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* are smaller than pages. We lump hardware tabes into big, page sized
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* software tables.
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*
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* PMD_SHIFT determines the size of the area a second-level page table entry
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* can map, and our pmd_t is 16 times larger than normal. The values which
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* were once defined here are now generic for 4c and srmmu, so they're
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* found in pgtable.h.
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*/
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#define SRMMU_PTRS_PER_PMD 4
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/* Definition of the values in the ET field of PTD's and PTE's */
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#define SRMMU_ET_MASK 0x3
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#define SRMMU_ET_INVALID 0x0
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#define SRMMU_ET_PTD 0x1
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#define SRMMU_ET_PTE 0x2
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#define SRMMU_ET_REPTE 0x3 /* AIEEE, SuperSparc II reverse endian page! */
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/* Physical page extraction from PTP's and PTE's. */
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#define SRMMU_CTX_PMASK 0xfffffff0
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#define SRMMU_PTD_PMASK 0xfffffff0
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#define SRMMU_PTE_PMASK 0xffffff00
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/* The pte non-page bits. Some notes:
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* 1) cache, dirty, valid, and ref are frobbable
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* for both supervisor and user pages.
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* 2) exec and write will only give the desired effect
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* on user pages
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* 3) use priv and priv_readonly for changing the
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* characteristics of supervisor ptes
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*/
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#define SRMMU_CACHE 0x80
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#define SRMMU_DIRTY 0x40
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#define SRMMU_REF 0x20
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#define SRMMU_NOREAD 0x10
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#define SRMMU_EXEC 0x08
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#define SRMMU_WRITE 0x04
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#define SRMMU_VALID 0x02 /* SRMMU_ET_PTE */
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#define SRMMU_PRIV 0x1c
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#define SRMMU_PRIV_RDONLY 0x18
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#define SRMMU_FILE 0x40 /* Implemented in software */
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#define SRMMU_PTE_FILE_SHIFT 8 /* == 32-PTE_FILE_MAX_BITS */
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#define SRMMU_CHG_MASK (0xffffff00 | SRMMU_REF | SRMMU_DIRTY)
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/* SRMMU swap entry encoding
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*
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* We use 5 bits for the type and 19 for the offset. This gives us
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* 32 swapfiles of 4GB each. Encoding looks like:
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*
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* oooooooooooooooooootttttRRRRRRRR
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* fedcba9876543210fedcba9876543210
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*
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* The bottom 8 bits are reserved for protection and status bits, especially
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* FILE and PRESENT.
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*/
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#define SRMMU_SWP_TYPE_MASK 0x1f
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#define SRMMU_SWP_TYPE_SHIFT SRMMU_PTE_FILE_SHIFT
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#define SRMMU_SWP_OFF_MASK 0x7ffff
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#define SRMMU_SWP_OFF_SHIFT (SRMMU_PTE_FILE_SHIFT + 5)
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/* Some day I will implement true fine grained access bits for
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* user pages because the SRMMU gives us the capabilities to
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* enforce all the protection levels that vma's can have.
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* XXX But for now...
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*/
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#define SRMMU_PAGE_NONE __pgprot(SRMMU_CACHE | \
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SRMMU_PRIV | SRMMU_REF)
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#define SRMMU_PAGE_SHARED __pgprot(SRMMU_VALID | SRMMU_CACHE | \
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SRMMU_EXEC | SRMMU_WRITE | SRMMU_REF)
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#define SRMMU_PAGE_COPY __pgprot(SRMMU_VALID | SRMMU_CACHE | \
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SRMMU_EXEC | SRMMU_REF)
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#define SRMMU_PAGE_RDONLY __pgprot(SRMMU_VALID | SRMMU_CACHE | \
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SRMMU_EXEC | SRMMU_REF)
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#define SRMMU_PAGE_KERNEL __pgprot(SRMMU_VALID | SRMMU_CACHE | SRMMU_PRIV | \
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SRMMU_DIRTY | SRMMU_REF)
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/* SRMMU Register addresses in ASI 0x4. These are valid for all
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* current SRMMU implementations that exist.
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*/
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#define SRMMU_CTRL_REG 0x00000000
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#define SRMMU_CTXTBL_PTR 0x00000100
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#define SRMMU_CTX_REG 0x00000200
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#define SRMMU_FAULT_STATUS 0x00000300
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#define SRMMU_FAULT_ADDR 0x00000400
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#define WINDOW_FLUSH(tmp1, tmp2) \
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mov 0, tmp1; \
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98: ld [%g6 + TI_UWINMASK], tmp2; \
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orcc %g0, tmp2, %g0; \
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add tmp1, 1, tmp1; \
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bne 98b; \
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save %sp, -64, %sp; \
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99: subcc tmp1, 1, tmp1; \
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bne 99b; \
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restore %g0, %g0, %g0;
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#ifndef __ASSEMBLY__
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/* This makes sense. Honest it does - Anton */
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/* XXX Yes but it's ugly as sin. FIXME. -KMW */
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extern void *srmmu_nocache_pool;
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#define __nocache_pa(VADDR) (((unsigned long)VADDR) - SRMMU_NOCACHE_VADDR + __pa((unsigned long)srmmu_nocache_pool))
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#define __nocache_va(PADDR) (__va((unsigned long)PADDR) - (unsigned long)srmmu_nocache_pool + SRMMU_NOCACHE_VADDR)
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#define __nocache_fix(VADDR) __va(__nocache_pa(VADDR))
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/* Accessing the MMU control register. */
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static inline unsigned int srmmu_get_mmureg(void)
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{
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unsigned int retval;
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__asm__ __volatile__("lda [%%g0] %1, %0\n\t" :
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"=r" (retval) :
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"i" (ASI_M_MMUREGS));
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return retval;
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}
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static inline void srmmu_set_mmureg(unsigned long regval)
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{
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__asm__ __volatile__("sta %0, [%%g0] %1\n\t" : :
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"r" (regval), "i" (ASI_M_MMUREGS) : "memory");
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}
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static inline void srmmu_set_ctable_ptr(unsigned long paddr)
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{
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paddr = ((paddr >> 4) & SRMMU_CTX_PMASK);
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__asm__ __volatile__("sta %0, [%1] %2\n\t" : :
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"r" (paddr), "r" (SRMMU_CTXTBL_PTR),
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"i" (ASI_M_MMUREGS) :
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"memory");
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}
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static inline unsigned long srmmu_get_ctable_ptr(void)
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{
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unsigned int retval;
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__asm__ __volatile__("lda [%1] %2, %0\n\t" :
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"=r" (retval) :
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"r" (SRMMU_CTXTBL_PTR),
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"i" (ASI_M_MMUREGS));
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return (retval & SRMMU_CTX_PMASK) << 4;
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}
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static inline void srmmu_set_context(int context)
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{
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__asm__ __volatile__("sta %0, [%1] %2\n\t" : :
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"r" (context), "r" (SRMMU_CTX_REG),
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"i" (ASI_M_MMUREGS) : "memory");
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}
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static inline int srmmu_get_context(void)
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{
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register int retval;
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__asm__ __volatile__("lda [%1] %2, %0\n\t" :
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"=r" (retval) :
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"r" (SRMMU_CTX_REG),
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"i" (ASI_M_MMUREGS));
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return retval;
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}
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static inline unsigned int srmmu_get_fstatus(void)
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{
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unsigned int retval;
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__asm__ __volatile__("lda [%1] %2, %0\n\t" :
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"=r" (retval) :
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"r" (SRMMU_FAULT_STATUS), "i" (ASI_M_MMUREGS));
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return retval;
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}
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static inline unsigned int srmmu_get_faddr(void)
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{
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unsigned int retval;
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__asm__ __volatile__("lda [%1] %2, %0\n\t" :
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"=r" (retval) :
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"r" (SRMMU_FAULT_ADDR), "i" (ASI_M_MMUREGS));
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return retval;
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}
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/* This is guaranteed on all SRMMU's. */
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static inline void srmmu_flush_whole_tlb(void)
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{
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__asm__ __volatile__("sta %%g0, [%0] %1\n\t": :
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"r" (0x400), /* Flush entire TLB!! */
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"i" (ASI_M_FLUSH_PROBE) : "memory");
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}
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/* These flush types are not available on all chips... */
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static inline void srmmu_flush_tlb_ctx(void)
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{
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__asm__ __volatile__("sta %%g0, [%0] %1\n\t": :
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"r" (0x300), /* Flush TLB ctx.. */
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"i" (ASI_M_FLUSH_PROBE) : "memory");
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}
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static inline void srmmu_flush_tlb_region(unsigned long addr)
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{
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addr &= SRMMU_PGDIR_MASK;
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__asm__ __volatile__("sta %%g0, [%0] %1\n\t": :
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"r" (addr | 0x200), /* Flush TLB region.. */
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"i" (ASI_M_FLUSH_PROBE) : "memory");
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}
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static inline void srmmu_flush_tlb_segment(unsigned long addr)
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{
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addr &= SRMMU_REAL_PMD_MASK;
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__asm__ __volatile__("sta %%g0, [%0] %1\n\t": :
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"r" (addr | 0x100), /* Flush TLB segment.. */
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"i" (ASI_M_FLUSH_PROBE) : "memory");
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}
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static inline void srmmu_flush_tlb_page(unsigned long page)
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{
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page &= PAGE_MASK;
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__asm__ __volatile__("sta %%g0, [%0] %1\n\t": :
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"r" (page), /* Flush TLB page.. */
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"i" (ASI_M_FLUSH_PROBE) : "memory");
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}
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#ifndef CONFIG_SPARC_LEON
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static inline unsigned long srmmu_hwprobe(unsigned long vaddr)
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{
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unsigned long retval;
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vaddr &= PAGE_MASK;
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__asm__ __volatile__("lda [%1] %2, %0\n\t" :
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"=r" (retval) :
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"r" (vaddr | 0x400), "i" (ASI_M_FLUSH_PROBE));
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return retval;
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}
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#else
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#define srmmu_hwprobe(addr) srmmu_swprobe(addr, 0)
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#endif
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static inline int
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srmmu_get_pte (unsigned long addr)
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{
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register unsigned long entry;
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__asm__ __volatile__("\n\tlda [%1] %2,%0\n\t" :
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"=r" (entry):
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"r" ((addr & 0xfffff000) | 0x400), "i" (ASI_M_FLUSH_PROBE));
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return entry;
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}
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extern unsigned long (*srmmu_read_physical)(unsigned long paddr);
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extern void (*srmmu_write_physical)(unsigned long paddr, unsigned long word);
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#endif /* !(__ASSEMBLY__) */
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#endif /* !(_SPARC_PGTSRMMU_H) */
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