179 lines
6.0 KiB
C
179 lines
6.0 KiB
C
/*
|
|
* 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) */
|