/* $Id: pgtsrmmu.h,v 1.31 2000/07/16 21:48:52 anton 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 /* 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 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 */ /* 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 #define WINDOW_FLUSH(tmp1, tmp2) \ mov 0, tmp1; \ 98: ld [%g6 + AOFF_task_thread + AOFF_thread_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__ /* 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) */