/* $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) */