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/* $Id: pgtsrmmu.h,v 1.28 1997/03/15 07:47:52 davem 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 */
#define SRMMU_VMALLOC_START (0xfe300000)
/* 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
#ifndef __ASSEMBLY__
/* Accessing the MMU control register. */
extern __inline__ unsigned int srmmu_get_mmureg(void)
{
unsigned int retval;
__asm__ __volatile__("lda [%%g0] %1, %0\n\t" :
"=r" (retval) :
"i" (ASI_M_MMUREGS));
return retval;
}
extern __inline__ void srmmu_set_mmureg(unsigned long regval)
{
__asm__ __volatile__("sta %0, [%%g0] %1\n\t" : :
"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] %2\n\t" : :
"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, %0\n\t" :
"=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] %2\n\t" : :
"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, %0\n\t" :
"=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, %0\n\t" :
"=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, %0\n\t" :
"=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] %1\n\t": :
"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] %1\n\t": :
"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] %1\n\t": :
"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] %1\n\t": :
"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] %1\n\t": :
"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, %0\n\t" :
"=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__("\n\tlda [%1] %2,%0\n\t" :
"=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) */
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