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/*- * Copyright (c) 2004-2010 Juli Mallett <jmallett@FreeBSD.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: release/9.1.0/sys/mips/include/pte.h 217354 2011-01-13 15:17:29Z jchandra $ */ #ifndef _MACHINE_PTE_H_ #define _MACHINE_PTE_H_ #ifndef _LOCORE #if defined(__mips_n64) || defined(__mips_n32) /* PHYSADDR_64_BIT */ typedef uint64_t pt_entry_t; #else typedef uint32_t pt_entry_t; #endif typedef pt_entry_t *pd_entry_t; #endif /* * TLB and PTE management. Most things operate within the context of * EntryLo0,1, and begin with TLBLO_. Things which work with EntryHi * start with TLBHI_. PTE bits begin with PTE_. * * Note that we use the same size VM and TLB pages. */ #define TLB_PAGE_SHIFT (PAGE_SHIFT) #define TLB_PAGE_SIZE (1 << TLB_PAGE_SHIFT) #define TLB_PAGE_MASK (TLB_PAGE_SIZE - 1) /* * TLB PageMask register. Has mask bits set above the default, 4K, page mask. */ #define TLBMASK_SHIFT (13) #define TLBMASK_MASK ((PAGE_MASK >> TLBMASK_SHIFT) << TLBMASK_SHIFT) /* * PFN for EntryLo register. Upper bits are 0, which is to say that * bit 29 is the last hardware bit; Bits 30 and upwards (EntryLo is * 64 bit though it can be referred to in 32-bits providing 2 software * bits safely. We use it as 64 bits to get many software bits, and * god knows what else.) are unacknowledged by hardware. They may be * written as anything, but otherwise they have as much meaning as * other 0 fields. */ #if defined(__mips_n64) || defined(__mips_n32) /* PHYSADDR_64_BIT */ #define TLBLO_SWBITS_SHIFT (34) #define TLBLO_PFN_MASK 0x3FFFFFFC0ULL #else #define TLBLO_SWBITS_SHIFT (30) #define TLBLO_PFN_MASK (0x3FFFFFC0) #endif #define TLBLO_PFN_SHIFT (6) #define TLBLO_SWBITS_MASK ((pt_entry_t)0x3 << TLBLO_SWBITS_SHIFT) #define TLBLO_PA_TO_PFN(pa) ((((pa) >> TLB_PAGE_SHIFT) << TLBLO_PFN_SHIFT) & TLBLO_PFN_MASK) #define TLBLO_PFN_TO_PA(pfn) ((vm_paddr_t)((pfn) >> TLBLO_PFN_SHIFT) << TLB_PAGE_SHIFT) #define TLBLO_PTE_TO_PFN(pte) ((pte) & TLBLO_PFN_MASK) #define TLBLO_PTE_TO_PA(pte) (TLBLO_PFN_TO_PA(TLBLO_PTE_TO_PFN((pte)))) /* * XXX This comment is not correct for anything more modern than R4K. * * VPN for EntryHi register. Upper two bits select user, supervisor, * or kernel. Bits 61 to 40 copy bit 63. VPN2 is bits 39 and down to * as low as 13, down to PAGE_SHIFT, to index 2 TLB pages*. From bit 12 * to bit 8 there is a 5-bit 0 field. Low byte is ASID. * * XXX This comment is not correct for FreeBSD. * Note that in FreeBSD, we map 2 TLB pages is equal to 1 VM page. */ #define TLBHI_ASID_MASK (0xff) #if defined(__mips_n64) #define TLBHI_R_SHIFT 62 #define TLBHI_R_USER (0x00UL << TLBHI_R_SHIFT) #define TLBHI_R_SUPERVISOR (0x01UL << TLBHI_R_SHIFT) #define TLBHI_R_KERNEL (0x03UL << TLBHI_R_SHIFT) #define TLBHI_R_MASK (0x03UL << TLBHI_R_SHIFT) #define TLBHI_VA_R(va) ((va) & TLBHI_R_MASK) #define TLBHI_FILL_SHIFT 40 #define TLBHI_VPN2_SHIFT (TLB_PAGE_SHIFT + 1) #define TLBHI_VPN2_MASK (((~((1UL << TLBHI_VPN2_SHIFT) - 1)) << (63 - TLBHI_FILL_SHIFT)) >> (63 - TLBHI_FILL_SHIFT)) #define TLBHI_VA_TO_VPN2(va) ((va) & TLBHI_VPN2_MASK) #define TLBHI_ENTRY(va, asid) ((TLBHI_VA_R((va))) /* Region. */ | \ (TLBHI_VA_TO_VPN2((va))) /* VPN2. */ | \ ((asid) & TLBHI_ASID_MASK)) #else /* !defined(__mips_n64) */ #define TLBHI_PAGE_MASK (2 * PAGE_SIZE - 1) #define TLBHI_ENTRY(va, asid) (((va) & ~TLBHI_PAGE_MASK) | ((asid) & TLBHI_ASID_MASK)) #endif /* defined(__mips_n64) */ /* * TLB flags managed in hardware: * C: Cache attribute. * D: Dirty bit. This means a page is writable. It is not * set at first, and a write is trapped, and the dirty * bit is set. See also PTE_RO. * V: Valid bit. Obvious, isn't it? * G: Global bit. This means that this mapping is present * in EVERY address space, and to ignore the ASID when * it is matched. */ #define PTE_C(attr) ((attr & 0x07) << 3) #define PTE_C_UNCACHED (PTE_C(MIPS_CCA_UNCACHED)) #define PTE_C_CACHE (PTE_C(MIPS_CCA_CACHED)) #define PTE_D 0x04 #define PTE_V 0x02 #define PTE_G 0x01 /* * VM flags managed in software: * RO: Read only. Never set PTE_D on this page, and don't * listen to requests to write to it. * W: Wired. ??? */ #define PTE_RO ((pt_entry_t)0x01 << TLBLO_SWBITS_SHIFT) #define PTE_W ((pt_entry_t)0x02 << TLBLO_SWBITS_SHIFT) /* * PTE management functions for bits defined above. */ #define pte_clear(pte, bit) (*(pte) &= ~(bit)) #define pte_set(pte, bit) (*(pte) |= (bit)) #define pte_test(pte, bit) ((*(pte) & (bit)) == (bit)) /* Assembly support for PTE access*/ #ifdef LOCORE #if defined(__mips_n64) || defined(__mips_n32) /* PHYSADDR_64_BIT */ #define PTESHIFT 3 #define PTE2MASK 0xff0 /* for the 2-page lo0/lo1 */ #define PTEMASK 0xff8 #define PTESIZE 8 #define PTE_L ld #define PTE_MTC0 dmtc0 #define CLEAR_PTE_SWBITS(pr) #else #define PTESHIFT 2 #define PTE2MASK 0xff8 /* for the 2-page lo0/lo1 */ #define PTEMASK 0xffc #define PTESIZE 4 #define PTE_L lw #define PTE_MTC0 mtc0 #define CLEAR_PTE_SWBITS(r) sll r, 2; srl r, 2 /* remove 2 high bits */ #endif /* defined(__mips_n64) || defined(__mips_n32) */ #if defined(__mips_n64) #define PTRSHIFT 3 #define PDEPTRMASK 0xff8 #else #define PTRSHIFT 2 #define PDEPTRMASK 0xffc #endif #endif /* LOCORE */ #endif /* !_MACHINE_PTE_H_ */