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Diffstat (limited to 'include/asm-ppc64/mmu.h')
| -rw-r--r-- | include/asm-ppc64/mmu.h | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/include/asm-ppc64/mmu.h b/include/asm-ppc64/mmu.h new file mode 100644 index 000000000000..188987e9d9d4 --- /dev/null +++ b/include/asm-ppc64/mmu.h @@ -0,0 +1,242 @@ +/* + * PowerPC memory management structures + * + * Dave Engebretsen & Mike Corrigan <{engebret|mikejc}@us.ibm.com> + * PPC64 rework. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#ifndef _PPC64_MMU_H_ +#define _PPC64_MMU_H_ + +#include <linux/config.h> +#include <asm/page.h> +#include <linux/stringify.h> + +#ifndef __ASSEMBLY__ + +/* Time to allow for more things here */ +typedef unsigned long mm_context_id_t; +typedef struct { + mm_context_id_t id; +#ifdef CONFIG_HUGETLB_PAGE + pgd_t *huge_pgdir; + u16 htlb_segs; /* bitmask */ +#endif +} mm_context_t; + +#define STE_ESID_V 0x80 +#define STE_ESID_KS 0x20 +#define STE_ESID_KP 0x10 +#define STE_ESID_N 0x08 + +#define STE_VSID_SHIFT 12 + +struct stab_entry { + unsigned long esid_data; + unsigned long vsid_data; +}; + +/* Hardware Page Table Entry */ + +#define HPTES_PER_GROUP 8 + +typedef struct { + unsigned long avpn:57; /* vsid | api == avpn */ + unsigned long : 2; /* Software use */ + unsigned long bolted: 1; /* HPTE is "bolted" */ + unsigned long lock: 1; /* lock on pSeries SMP */ + unsigned long l: 1; /* Virtual page is large (L=1) or 4 KB (L=0) */ + unsigned long h: 1; /* Hash function identifier */ + unsigned long v: 1; /* Valid (v=1) or invalid (v=0) */ +} Hpte_dword0; + +typedef struct { + unsigned long pp0: 1; /* Page protection bit 0 */ + unsigned long ts: 1; /* Tag set bit */ + unsigned long rpn: 50; /* Real page number */ + unsigned long : 2; /* Reserved */ + unsigned long ac: 1; /* Address compare */ + unsigned long r: 1; /* Referenced */ + unsigned long c: 1; /* Changed */ + unsigned long w: 1; /* Write-thru cache mode */ + unsigned long i: 1; /* Cache inhibited */ + unsigned long m: 1; /* Memory coherence required */ + unsigned long g: 1; /* Guarded */ + unsigned long n: 1; /* No-execute */ + unsigned long pp: 2; /* Page protection bits 1:2 */ +} Hpte_dword1; + +typedef struct { + char padding[6]; /* padding */ + unsigned long : 6; /* padding */ + unsigned long flags: 10; /* HPTE flags */ +} Hpte_dword1_flags; + +typedef struct { + union { + unsigned long dword0; + Hpte_dword0 dw0; + } dw0; + + union { + unsigned long dword1; + Hpte_dword1 dw1; + Hpte_dword1_flags flags; + } dw1; +} HPTE; + +/* Values for PP (assumes Ks=0, Kp=1) */ +/* pp0 will always be 0 for linux */ +#define PP_RWXX 0 /* Supervisor read/write, User none */ +#define PP_RWRX 1 /* Supervisor read/write, User read */ +#define PP_RWRW 2 /* Supervisor read/write, User read/write */ +#define PP_RXRX 3 /* Supervisor read, User read */ + + +extern HPTE * htab_address; +extern unsigned long htab_hash_mask; + +static inline unsigned long hpt_hash(unsigned long vpn, int large) +{ + unsigned long vsid; + unsigned long page; + + if (large) { + vsid = vpn >> 4; + page = vpn & 0xf; + } else { + vsid = vpn >> 16; + page = vpn & 0xffff; + } + + return (vsid & 0x7fffffffffUL) ^ page; +} + +static inline void __tlbie(unsigned long va, int large) +{ + /* clear top 16 bits, non SLS segment */ + va &= ~(0xffffULL << 48); + + if (large) { + va &= HPAGE_MASK; + asm volatile("tlbie %0,1" : : "r"(va) : "memory"); + } else { + va &= PAGE_MASK; + asm volatile("tlbie %0,0" : : "r"(va) : "memory"); + } +} + +static inline void tlbie(unsigned long va, int large) +{ + asm volatile("ptesync": : :"memory"); + __tlbie(va, large); + asm volatile("eieio; tlbsync; ptesync": : :"memory"); +} + +static inline void __tlbiel(unsigned long va) +{ + /* clear top 16 bits, non SLS segment */ + va &= ~(0xffffULL << 48); + va &= PAGE_MASK; + + /* + * Thanks to Alan Modra we are now able to use machine specific + * assembly instructions (like tlbiel) by using the gas -many flag. + * However we have to support older toolchains so for the moment + * we hardwire it. + */ +#if 0 + asm volatile("tlbiel %0" : : "r"(va) : "memory"); +#else + asm volatile(".long 0x7c000224 | (%0 << 11)" : : "r"(va) : "memory"); +#endif +} + +static inline void tlbiel(unsigned long va) +{ + asm volatile("ptesync": : :"memory"); + __tlbiel(va); + asm volatile("ptesync": : :"memory"); +} + +/* + * Handle a fault by adding an HPTE. If the address can't be determined + * to be valid via Linux page tables, return 1. If handled return 0 + */ +extern int __hash_page(unsigned long ea, unsigned long access, + unsigned long vsid, pte_t *ptep, unsigned long trap, + int local); + +extern void htab_finish_init(void); + +#endif /* __ASSEMBLY__ */ + +/* + * Location of cpu0's segment table + */ +#define STAB0_PAGE 0x9 +#define STAB0_PHYS_ADDR (STAB0_PAGE<<PAGE_SHIFT) +#define STAB0_VIRT_ADDR (KERNELBASE+STAB0_PHYS_ADDR) + +#define SLB_NUM_BOLTED 3 +#define SLB_CACHE_ENTRIES 8 + +/* Bits in the SLB ESID word */ +#define SLB_ESID_V 0x0000000008000000 /* entry is valid */ + +/* Bits in the SLB VSID word */ +#define SLB_VSID_SHIFT 12 +#define SLB_VSID_KS 0x0000000000000800 +#define SLB_VSID_KP 0x0000000000000400 +#define SLB_VSID_N 0x0000000000000200 /* no-execute */ +#define SLB_VSID_L 0x0000000000000100 /* largepage (4M) */ +#define SLB_VSID_C 0x0000000000000080 /* class */ + +#define SLB_VSID_KERNEL (SLB_VSID_KP|SLB_VSID_C) +#define SLB_VSID_USER (SLB_VSID_KP|SLB_VSID_KS) + +#define VSID_MULTIPLIER ASM_CONST(200730139) /* 28-bit prime */ +#define VSID_BITS 36 +#define VSID_MODULUS ((1UL<<VSID_BITS)-1) + +#define CONTEXT_BITS 20 +#define USER_ESID_BITS 15 + +/* + * This macro generates asm code to compute the VSID scramble + * function. Used in slb_allocate() and do_stab_bolted. The function + * computed is: (protovsid*VSID_MULTIPLIER) % VSID_MODULUS + * + * rt = register continaing the proto-VSID and into which the + * VSID will be stored + * rx = scratch register (clobbered) + * + * - rt and rx must be different registers + * - The answer will end up in the low 36 bits of rt. The higher + * bits may contain other garbage, so you may need to mask the + * result. + */ +#define ASM_VSID_SCRAMBLE(rt, rx) \ + lis rx,VSID_MULTIPLIER@h; \ + ori rx,rx,VSID_MULTIPLIER@l; \ + mulld rt,rt,rx; /* rt = rt * MULTIPLIER */ \ + \ + srdi rx,rt,VSID_BITS; \ + clrldi rt,rt,(64-VSID_BITS); \ + add rt,rt,rx; /* add high and low bits */ \ + /* Now, r3 == VSID (mod 2^36-1), and lies between 0 and \ + * 2^36-1+2^28-1. That in particular means that if r3 >= \ + * 2^36-1, then r3+1 has the 2^36 bit set. So, if r3+1 has \ + * the bit clear, r3 already has the answer we want, if it \ + * doesn't, the answer is the low 36 bits of r3+1. So in all \ + * cases the answer is the low 36 bits of (r3 + ((r3+1) >> 36))*/\ + addi rx,rt,1; \ + srdi rx,rx,VSID_BITS; /* extract 2^36 bit */ \ + add rt,rt,rx + +#endif /* _PPC64_MMU_H_ */ |