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Diffstat (limited to 'arch/sparc/include/asm/pgtsrmmu.h')
| -rw-r--r-- | arch/sparc/include/asm/pgtsrmmu.h | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/pgtsrmmu.h b/arch/sparc/include/asm/pgtsrmmu.h new file mode 100644 index 000000000..32a508897 --- /dev/null +++ b/arch/sparc/include/asm/pgtsrmmu.h @@ -0,0 +1,179 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * 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) */ |