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352 lines
10 KiB
352 lines
10 KiB
/*
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* PowerPC memory management structures
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*
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* Dave Engebretsen & Mike Corrigan <{engebret|mikejc}@us.ibm.com>
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* PPC64 rework.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _PPC64_MMU_H_
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#define _PPC64_MMU_H_
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#include <linux/config.h>
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#include <asm/page.h>
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/*
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* Segment table
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*/
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#define STE_ESID_V 0x80
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#define STE_ESID_KS 0x20
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#define STE_ESID_KP 0x10
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#define STE_ESID_N 0x08
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#define STE_VSID_SHIFT 12
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/* Location of cpu0's segment table */
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#define STAB0_PAGE 0x6
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#define STAB0_PHYS_ADDR (STAB0_PAGE<<PAGE_SHIFT)
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#ifndef __ASSEMBLY__
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extern char initial_stab[];
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#endif /* ! __ASSEMBLY */
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/*
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* SLB
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*/
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#define SLB_NUM_BOLTED 3
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#define SLB_CACHE_ENTRIES 8
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/* Bits in the SLB ESID word */
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#define SLB_ESID_V ASM_CONST(0x0000000008000000) /* valid */
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/* Bits in the SLB VSID word */
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#define SLB_VSID_SHIFT 12
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#define SLB_VSID_KS ASM_CONST(0x0000000000000800)
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#define SLB_VSID_KP ASM_CONST(0x0000000000000400)
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#define SLB_VSID_N ASM_CONST(0x0000000000000200) /* no-execute */
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#define SLB_VSID_L ASM_CONST(0x0000000000000100) /* largepage */
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#define SLB_VSID_C ASM_CONST(0x0000000000000080) /* class */
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#define SLB_VSID_LS ASM_CONST(0x0000000000000070) /* size of largepage */
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#define SLB_VSID_KERNEL (SLB_VSID_KP)
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#define SLB_VSID_USER (SLB_VSID_KP|SLB_VSID_KS|SLB_VSID_C)
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#define SLBIE_C (0x08000000)
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/*
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* Hash table
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*/
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#define HPTES_PER_GROUP 8
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#define HPTE_V_AVPN_SHIFT 7
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#define HPTE_V_AVPN ASM_CONST(0xffffffffffffff80)
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#define HPTE_V_AVPN_VAL(x) (((x) & HPTE_V_AVPN) >> HPTE_V_AVPN_SHIFT)
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#define HPTE_V_BOLTED ASM_CONST(0x0000000000000010)
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#define HPTE_V_LOCK ASM_CONST(0x0000000000000008)
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#define HPTE_V_LARGE ASM_CONST(0x0000000000000004)
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#define HPTE_V_SECONDARY ASM_CONST(0x0000000000000002)
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#define HPTE_V_VALID ASM_CONST(0x0000000000000001)
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#define HPTE_R_PP0 ASM_CONST(0x8000000000000000)
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#define HPTE_R_TS ASM_CONST(0x4000000000000000)
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#define HPTE_R_RPN_SHIFT 12
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#define HPTE_R_RPN ASM_CONST(0x3ffffffffffff000)
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#define HPTE_R_FLAGS ASM_CONST(0x00000000000003ff)
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#define HPTE_R_PP ASM_CONST(0x0000000000000003)
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/* Values for PP (assumes Ks=0, Kp=1) */
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/* pp0 will always be 0 for linux */
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#define PP_RWXX 0 /* Supervisor read/write, User none */
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#define PP_RWRX 1 /* Supervisor read/write, User read */
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#define PP_RWRW 2 /* Supervisor read/write, User read/write */
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#define PP_RXRX 3 /* Supervisor read, User read */
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#ifndef __ASSEMBLY__
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typedef struct {
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unsigned long v;
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unsigned long r;
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} hpte_t;
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extern hpte_t *htab_address;
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extern unsigned long htab_hash_mask;
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static inline unsigned long hpt_hash(unsigned long vpn, int large)
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{
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unsigned long vsid;
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unsigned long page;
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if (large) {
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vsid = vpn >> 4;
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page = vpn & 0xf;
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} else {
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vsid = vpn >> 16;
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page = vpn & 0xffff;
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}
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return (vsid & 0x7fffffffffUL) ^ page;
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}
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static inline void __tlbie(unsigned long va, int large)
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{
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/* clear top 16 bits, non SLS segment */
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va &= ~(0xffffULL << 48);
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if (large) {
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va &= HPAGE_MASK;
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asm volatile("tlbie %0,1" : : "r"(va) : "memory");
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} else {
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va &= PAGE_MASK;
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asm volatile("tlbie %0,0" : : "r"(va) : "memory");
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}
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}
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static inline void tlbie(unsigned long va, int large)
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{
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asm volatile("ptesync": : :"memory");
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__tlbie(va, large);
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asm volatile("eieio; tlbsync; ptesync": : :"memory");
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}
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static inline void __tlbiel(unsigned long va)
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{
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/* clear top 16 bits, non SLS segment */
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va &= ~(0xffffULL << 48);
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va &= PAGE_MASK;
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/*
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* Thanks to Alan Modra we are now able to use machine specific
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* assembly instructions (like tlbiel) by using the gas -many flag.
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* However we have to support older toolchains so for the moment
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* we hardwire it.
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*/
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#if 0
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asm volatile("tlbiel %0" : : "r"(va) : "memory");
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#else
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asm volatile(".long 0x7c000224 | (%0 << 11)" : : "r"(va) : "memory");
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#endif
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}
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static inline void tlbiel(unsigned long va)
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{
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asm volatile("ptesync": : :"memory");
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__tlbiel(va);
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asm volatile("ptesync": : :"memory");
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}
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static inline unsigned long slot2va(unsigned long hpte_v, unsigned long slot)
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{
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unsigned long avpn = HPTE_V_AVPN_VAL(hpte_v);
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unsigned long va;
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va = avpn << 23;
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if (! (hpte_v & HPTE_V_LARGE)) {
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unsigned long vpi, pteg;
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pteg = slot / HPTES_PER_GROUP;
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if (hpte_v & HPTE_V_SECONDARY)
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pteg = ~pteg;
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vpi = ((va >> 28) ^ pteg) & htab_hash_mask;
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va |= vpi << PAGE_SHIFT;
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}
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return va;
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}
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/*
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* Handle a fault by adding an HPTE. If the address can't be determined
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* to be valid via Linux page tables, return 1. If handled return 0
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*/
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extern int __hash_page(unsigned long ea, unsigned long access,
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unsigned long vsid, pte_t *ptep, unsigned long trap,
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int local);
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extern void htab_finish_init(void);
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extern void hpte_init_native(void);
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extern void hpte_init_lpar(void);
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extern void hpte_init_iSeries(void);
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extern long pSeries_lpar_hpte_insert(unsigned long hpte_group,
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unsigned long va, unsigned long prpn,
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unsigned long vflags,
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unsigned long rflags);
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extern long native_hpte_insert(unsigned long hpte_group, unsigned long va,
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unsigned long prpn,
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unsigned long vflags, unsigned long rflags);
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extern void stabs_alloc(void);
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#endif /* __ASSEMBLY__ */
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/*
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* VSID allocation
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*
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* We first generate a 36-bit "proto-VSID". For kernel addresses this
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* is equal to the ESID, for user addresses it is:
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* (context << 15) | (esid & 0x7fff)
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*
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* The two forms are distinguishable because the top bit is 0 for user
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* addresses, whereas the top two bits are 1 for kernel addresses.
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* Proto-VSIDs with the top two bits equal to 0b10 are reserved for
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* now.
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*
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* The proto-VSIDs are then scrambled into real VSIDs with the
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* multiplicative hash:
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*
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* VSID = (proto-VSID * VSID_MULTIPLIER) % VSID_MODULUS
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* where VSID_MULTIPLIER = 268435399 = 0xFFFFFC7
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* VSID_MODULUS = 2^36-1 = 0xFFFFFFFFF
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*
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* This scramble is only well defined for proto-VSIDs below
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* 0xFFFFFFFFF, so both proto-VSID and actual VSID 0xFFFFFFFFF are
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* reserved. VSID_MULTIPLIER is prime, so in particular it is
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* co-prime to VSID_MODULUS, making this a 1:1 scrambling function.
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* Because the modulus is 2^n-1 we can compute it efficiently without
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* a divide or extra multiply (see below).
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*
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* This scheme has several advantages over older methods:
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*
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* - We have VSIDs allocated for every kernel address
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* (i.e. everything above 0xC000000000000000), except the very top
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* segment, which simplifies several things.
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*
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* - We allow for 15 significant bits of ESID and 20 bits of
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* context for user addresses. i.e. 8T (43 bits) of address space for
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* up to 1M contexts (although the page table structure and context
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* allocation will need changes to take advantage of this).
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*
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* - The scramble function gives robust scattering in the hash
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* table (at least based on some initial results). The previous
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* method was more susceptible to pathological cases giving excessive
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* hash collisions.
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*/
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/*
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* WARNING - If you change these you must make sure the asm
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* implementations in slb_allocate (slb_low.S), do_stab_bolted
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* (head.S) and ASM_VSID_SCRAMBLE (below) are changed accordingly.
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*
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* You'll also need to change the precomputed VSID values in head.S
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* which are used by the iSeries firmware.
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*/
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#define VSID_MULTIPLIER ASM_CONST(200730139) /* 28-bit prime */
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#define VSID_BITS 36
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#define VSID_MODULUS ((1UL<<VSID_BITS)-1)
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#define CONTEXT_BITS 19
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#define USER_ESID_BITS 16
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#define USER_VSID_RANGE (1UL << (USER_ESID_BITS + SID_SHIFT))
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/*
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* This macro generates asm code to compute the VSID scramble
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* function. Used in slb_allocate() and do_stab_bolted. The function
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* computed is: (protovsid*VSID_MULTIPLIER) % VSID_MODULUS
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*
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* rt = register continaing the proto-VSID and into which the
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* VSID will be stored
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* rx = scratch register (clobbered)
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*
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* - rt and rx must be different registers
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* - The answer will end up in the low 36 bits of rt. The higher
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* bits may contain other garbage, so you may need to mask the
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* result.
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*/
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#define ASM_VSID_SCRAMBLE(rt, rx) \
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lis rx,VSID_MULTIPLIER@h; \
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ori rx,rx,VSID_MULTIPLIER@l; \
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mulld rt,rt,rx; /* rt = rt * MULTIPLIER */ \
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\
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srdi rx,rt,VSID_BITS; \
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clrldi rt,rt,(64-VSID_BITS); \
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add rt,rt,rx; /* add high and low bits */ \
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/* Now, r3 == VSID (mod 2^36-1), and lies between 0 and \
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* 2^36-1+2^28-1. That in particular means that if r3 >= \
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* 2^36-1, then r3+1 has the 2^36 bit set. So, if r3+1 has \
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* the bit clear, r3 already has the answer we want, if it \
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* doesn't, the answer is the low 36 bits of r3+1. So in all \
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* cases the answer is the low 36 bits of (r3 + ((r3+1) >> 36))*/\
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addi rx,rt,1; \
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srdi rx,rx,VSID_BITS; /* extract 2^36 bit */ \
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add rt,rt,rx
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#ifndef __ASSEMBLY__
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typedef unsigned long mm_context_id_t;
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typedef struct {
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mm_context_id_t id;
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#ifdef CONFIG_HUGETLB_PAGE
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u16 low_htlb_areas, high_htlb_areas;
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#endif
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} mm_context_t;
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static inline unsigned long vsid_scramble(unsigned long protovsid)
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{
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#if 0
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/* The code below is equivalent to this function for arguments
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* < 2^VSID_BITS, which is all this should ever be called
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* with. However gcc is not clever enough to compute the
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* modulus (2^n-1) without a second multiply. */
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return ((protovsid * VSID_MULTIPLIER) % VSID_MODULUS);
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#else /* 1 */
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unsigned long x;
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x = protovsid * VSID_MULTIPLIER;
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x = (x >> VSID_BITS) + (x & VSID_MODULUS);
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return (x + ((x+1) >> VSID_BITS)) & VSID_MODULUS;
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#endif /* 1 */
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}
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/* This is only valid for addresses >= KERNELBASE */
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static inline unsigned long get_kernel_vsid(unsigned long ea)
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{
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return vsid_scramble(ea >> SID_SHIFT);
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}
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/* This is only valid for user addresses (which are below 2^41) */
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static inline unsigned long get_vsid(unsigned long context, unsigned long ea)
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{
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return vsid_scramble((context << USER_ESID_BITS)
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| (ea >> SID_SHIFT));
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}
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#define VSID_SCRAMBLE(pvsid) (((pvsid) * VSID_MULTIPLIER) % VSID_MODULUS)
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#define KERNEL_VSID(ea) VSID_SCRAMBLE(GET_ESID(ea))
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#endif /* __ASSEMBLY */
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#endif /* _PPC64_MMU_H_ */
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