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/* $Id: pgtsun4c.h,v 1.37 2000/06/05 06:08:46 anton Exp $
* pgtsun4c.h: Sun4c specific pgtable.h defines and code.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#ifndef _SPARC_PGTSUN4C_H
#define _SPARC_PGTSUN4C_H
#include <asm/contregs.h>
/* PMD_SHIFT determines the size of the area a second-level page table can map */
#define SUN4C_PMD_SHIFT 22
/* PGDIR_SHIFT determines what a third-level page table entry can map */
#define SUN4C_PGDIR_SHIFT 22
#define SUN4C_PGDIR_SIZE (1UL << SUN4C_PGDIR_SHIFT)
#define SUN4C_PGDIR_MASK (~(SUN4C_PGDIR_SIZE-1))
#define SUN4C_PGDIR_ALIGN(addr) (((addr)+SUN4C_PGDIR_SIZE-1)&SUN4C_PGDIR_MASK)
/* To represent how the sun4c mmu really lays things out. */
#define SUN4C_REAL_PGDIR_SHIFT 18
#define SUN4C_REAL_PGDIR_SIZE (1UL << SUN4C_REAL_PGDIR_SHIFT)
#define SUN4C_REAL_PGDIR_MASK (~(SUN4C_REAL_PGDIR_SIZE-1))
#define SUN4C_REAL_PGDIR_ALIGN(addr) (((addr)+SUN4C_REAL_PGDIR_SIZE-1)&SUN4C_REAL_PGDIR_MASK)
/* 16 bit PFN on sun4c */
#define SUN4C_PFN_MASK 0xffff
/* Don't increase these unless the structures in sun4c.c are fixed */
#define SUN4C_MAX_SEGMAPS 256
#define SUN4C_MAX_CONTEXTS 16
/*
* To be efficient, and not have to worry about allocating such
* a huge pgd, we make the kernel sun4c tables each hold 1024
* entries and the pgd similarly just like the i386 tables.
*/
#define SUN4C_PTRS_PER_PTE 1024
#define SUN4C_PTRS_PER_PMD 1
#define SUN4C_PTRS_PER_PGD 1024
/*
* Sparc SUN4C pte fields.
*/
#define _SUN4C_PAGE_VALID 0x80000000
#define _SUN4C_PAGE_SILENT_READ 0x80000000 /* synonym */
#define _SUN4C_PAGE_DIRTY 0x40000000
#define _SUN4C_PAGE_SILENT_WRITE 0x40000000 /* synonym */
#define _SUN4C_PAGE_PRIV 0x20000000 /* privileged page */
#define _SUN4C_PAGE_NOCACHE 0x10000000 /* non-cacheable page */
#define _SUN4C_PAGE_PRESENT 0x08000000 /* implemented in software */
#define _SUN4C_PAGE_IO 0x04000000 /* I/O page */
#define _SUN4C_PAGE_FILE 0x02000000 /* implemented in software */
#define _SUN4C_PAGE_READ 0x00800000 /* implemented in software */
#define _SUN4C_PAGE_WRITE 0x00400000 /* implemented in software */
#define _SUN4C_PAGE_ACCESSED 0x00200000 /* implemented in software */
#define _SUN4C_PAGE_MODIFIED 0x00100000 /* implemented in software */
#define _SUN4C_READABLE (_SUN4C_PAGE_READ|_SUN4C_PAGE_SILENT_READ|\
_SUN4C_PAGE_ACCESSED)
#define _SUN4C_WRITEABLE (_SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE|\
_SUN4C_PAGE_MODIFIED)
#define _SUN4C_PAGE_CHG_MASK (0xffff|_SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_MODIFIED)
#define SUN4C_PAGE_NONE __pgprot(_SUN4C_PAGE_PRESENT)
#define SUN4C_PAGE_SHARED __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE|\
_SUN4C_PAGE_WRITE)
#define SUN4C_PAGE_COPY __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
#define SUN4C_PAGE_READONLY __pgprot(_SUN4C_PAGE_PRESENT|_SUN4C_READABLE)
#define SUN4C_PAGE_KERNEL __pgprot(_SUN4C_READABLE|_SUN4C_WRITEABLE|\
_SUN4C_PAGE_DIRTY|_SUN4C_PAGE_PRIV)
/* SUN4C 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:
*
* RRRRRRRRooooooooooooooooooottttt
* fedcba9876543210fedcba9876543210
*
* The top 8 bits are reserved for protection and status bits, especially
* FILE and PRESENT.
*/
#define SUN4C_SWP_TYPE_MASK 0x1f
#define SUN4C_SWP_OFF_MASK 0x7ffff
#define SUN4C_SWP_OFF_SHIFT 5
#ifndef __ASSEMBLY__
static inline unsigned long sun4c_get_synchronous_error(void)
{
unsigned long sync_err;
__asm__ __volatile__("lda [%1] %2, %0\n\t" :
"=r" (sync_err) :
"r" (AC_SYNC_ERR), "i" (ASI_CONTROL));
return sync_err;
}
static inline unsigned long sun4c_get_synchronous_address(void)
{
unsigned long sync_addr;
__asm__ __volatile__("lda [%1] %2, %0\n\t" :
"=r" (sync_addr) :
"r" (AC_SYNC_VA), "i" (ASI_CONTROL));
return sync_addr;
}
/* SUN4C pte, segmap, and context manipulation */
static inline unsigned long sun4c_get_segmap(unsigned long addr)
{
register unsigned long entry;
__asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :
"=r" (entry) :
"r" (addr), "i" (ASI_SEGMAP));
return entry;
}
static inline void sun4c_put_segmap(unsigned long addr, unsigned long entry)
{
__asm__ __volatile__("\n\tstba %1, [%0] %2; nop; nop; nop;\n\t" : :
"r" (addr), "r" (entry),
"i" (ASI_SEGMAP)
: "memory");
}
static inline unsigned long sun4c_get_pte(unsigned long addr)
{
register unsigned long entry;
__asm__ __volatile__("\n\tlda [%1] %2, %0\n\t" :
"=r" (entry) :
"r" (addr), "i" (ASI_PTE));
return entry;
}
static inline void sun4c_put_pte(unsigned long addr, unsigned long entry)
{
__asm__ __volatile__("\n\tsta %1, [%0] %2; nop; nop; nop;\n\t" : :
"r" (addr),
"r" ((entry & ~(_SUN4C_PAGE_PRESENT))), "i" (ASI_PTE)
: "memory");
}
static inline int sun4c_get_context(void)
{
register int ctx;
__asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" :
"=r" (ctx) :
"r" (AC_CONTEXT), "i" (ASI_CONTROL));
return ctx;
}
static inline int sun4c_set_context(int ctx)
{
__asm__ __volatile__("\n\tstba %0, [%1] %2; nop; nop; nop;\n\t" : :
"r" (ctx), "r" (AC_CONTEXT), "i" (ASI_CONTROL)
: "memory");
return ctx;
}
#endif /* !(__ASSEMBLY__) */
#endif /* !(_SPARC_PGTSUN4C_H) */
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