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authorStephen Rothwell <sfr@canb.auug.org.au>2008-08-01 15:20:30 +1000
committerPaul Mackerras <paulus@samba.org>2008-08-04 12:02:00 +1000
commitb8b572e1015f81b4e748417be2629dfe51ab99f9 (patch)
tree7df58667d5ed71d6c8f8f4ce40ca16b6fb776d0b /arch/powerpc/include/asm/mmu-hash64.h
parent2b12a4c524812fb3f6ee590a02e65b95c8c32229 (diff)
powerpc: Move include files to arch/powerpc/include/asm
from include/asm-powerpc. This is the result of a mkdir arch/powerpc/include/asm git mv include/asm-powerpc/* arch/powerpc/include/asm Followed by a few documentation/comment fixups and a couple of places where <asm-powepc/...> was being used explicitly. Of the latter only one was outside the arch code and it is a driver only built for powerpc. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/include/asm/mmu-hash64.h')
-rw-r--r--arch/powerpc/include/asm/mmu-hash64.h478
1 files changed, 478 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h
new file mode 100644
index 00000000000..19c7a940349
--- /dev/null
+++ b/arch/powerpc/include/asm/mmu-hash64.h
@@ -0,0 +1,478 @@
+#ifndef _ASM_POWERPC_MMU_HASH64_H_
+#define _ASM_POWERPC_MMU_HASH64_H_
+/*
+ * PowerPC64 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.
+ */
+
+#include <asm/asm-compat.h>
+#include <asm/page.h>
+
+/*
+ * Segment table
+ */
+
+#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
+
+/* Location of cpu0's segment table */
+#define STAB0_PAGE 0x6
+#define STAB0_OFFSET (STAB0_PAGE << 12)
+#define STAB0_PHYS_ADDR (STAB0_OFFSET + PHYSICAL_START)
+
+#ifndef __ASSEMBLY__
+extern char initial_stab[];
+#endif /* ! __ASSEMBLY */
+
+/*
+ * SLB
+ */
+
+#define SLB_NUM_BOLTED 3
+#define SLB_CACHE_ENTRIES 8
+
+/* Bits in the SLB ESID word */
+#define SLB_ESID_V ASM_CONST(0x0000000008000000) /* valid */
+
+/* Bits in the SLB VSID word */
+#define SLB_VSID_SHIFT 12
+#define SLB_VSID_SHIFT_1T 24
+#define SLB_VSID_SSIZE_SHIFT 62
+#define SLB_VSID_B ASM_CONST(0xc000000000000000)
+#define SLB_VSID_B_256M ASM_CONST(0x0000000000000000)
+#define SLB_VSID_B_1T ASM_CONST(0x4000000000000000)
+#define SLB_VSID_KS ASM_CONST(0x0000000000000800)
+#define SLB_VSID_KP ASM_CONST(0x0000000000000400)
+#define SLB_VSID_N ASM_CONST(0x0000000000000200) /* no-execute */
+#define SLB_VSID_L ASM_CONST(0x0000000000000100)
+#define SLB_VSID_C ASM_CONST(0x0000000000000080) /* class */
+#define SLB_VSID_LP ASM_CONST(0x0000000000000030)
+#define SLB_VSID_LP_00 ASM_CONST(0x0000000000000000)
+#define SLB_VSID_LP_01 ASM_CONST(0x0000000000000010)
+#define SLB_VSID_LP_10 ASM_CONST(0x0000000000000020)
+#define SLB_VSID_LP_11 ASM_CONST(0x0000000000000030)
+#define SLB_VSID_LLP (SLB_VSID_L|SLB_VSID_LP)
+
+#define SLB_VSID_KERNEL (SLB_VSID_KP)
+#define SLB_VSID_USER (SLB_VSID_KP|SLB_VSID_KS|SLB_VSID_C)
+
+#define SLBIE_C (0x08000000)
+#define SLBIE_SSIZE_SHIFT 25
+
+/*
+ * Hash table
+ */
+
+#define HPTES_PER_GROUP 8
+
+#define HPTE_V_SSIZE_SHIFT 62
+#define HPTE_V_AVPN_SHIFT 7
+#define HPTE_V_AVPN ASM_CONST(0x3fffffffffffff80)
+#define HPTE_V_AVPN_VAL(x) (((x) & HPTE_V_AVPN) >> HPTE_V_AVPN_SHIFT)
+#define HPTE_V_COMPARE(x,y) (!(((x) ^ (y)) & 0xffffffffffffff80UL))
+#define HPTE_V_BOLTED ASM_CONST(0x0000000000000010)
+#define HPTE_V_LOCK ASM_CONST(0x0000000000000008)
+#define HPTE_V_LARGE ASM_CONST(0x0000000000000004)
+#define HPTE_V_SECONDARY ASM_CONST(0x0000000000000002)
+#define HPTE_V_VALID ASM_CONST(0x0000000000000001)
+
+#define HPTE_R_PP0 ASM_CONST(0x8000000000000000)
+#define HPTE_R_TS ASM_CONST(0x4000000000000000)
+#define HPTE_R_RPN_SHIFT 12
+#define HPTE_R_RPN ASM_CONST(0x3ffffffffffff000)
+#define HPTE_R_FLAGS ASM_CONST(0x00000000000003ff)
+#define HPTE_R_PP ASM_CONST(0x0000000000000003)
+#define HPTE_R_N ASM_CONST(0x0000000000000004)
+#define HPTE_R_C ASM_CONST(0x0000000000000080)
+#define HPTE_R_R ASM_CONST(0x0000000000000100)
+
+#define HPTE_V_1TB_SEG ASM_CONST(0x4000000000000000)
+#define HPTE_V_VRMA_MASK ASM_CONST(0x4001ffffff000000)
+
+/* 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 */
+
+#ifndef __ASSEMBLY__
+
+struct hash_pte {
+ unsigned long v;
+ unsigned long r;
+};
+
+extern struct hash_pte *htab_address;
+extern unsigned long htab_size_bytes;
+extern unsigned long htab_hash_mask;
+
+/*
+ * Page size definition
+ *
+ * shift : is the "PAGE_SHIFT" value for that page size
+ * sllp : is a bit mask with the value of SLB L || LP to be or'ed
+ * directly to a slbmte "vsid" value
+ * penc : is the HPTE encoding mask for the "LP" field:
+ *
+ */
+struct mmu_psize_def
+{
+ unsigned int shift; /* number of bits */
+ unsigned int penc; /* HPTE encoding */
+ unsigned int tlbiel; /* tlbiel supported for that page size */
+ unsigned long avpnm; /* bits to mask out in AVPN in the HPTE */
+ unsigned long sllp; /* SLB L||LP (exact mask to use in slbmte) */
+};
+
+#endif /* __ASSEMBLY__ */
+
+/*
+ * The kernel use the constants below to index in the page sizes array.
+ * The use of fixed constants for this purpose is better for performances
+ * of the low level hash refill handlers.
+ *
+ * A non supported page size has a "shift" field set to 0
+ *
+ * Any new page size being implemented can get a new entry in here. Whether
+ * the kernel will use it or not is a different matter though. The actual page
+ * size used by hugetlbfs is not defined here and may be made variable
+ */
+
+#define MMU_PAGE_4K 0 /* 4K */
+#define MMU_PAGE_64K 1 /* 64K */
+#define MMU_PAGE_64K_AP 2 /* 64K Admixed (in a 4K segment) */
+#define MMU_PAGE_1M 3 /* 1M */
+#define MMU_PAGE_16M 4 /* 16M */
+#define MMU_PAGE_16G 5 /* 16G */
+#define MMU_PAGE_COUNT 6
+
+/*
+ * Segment sizes.
+ * These are the values used by hardware in the B field of
+ * SLB entries and the first dword of MMU hashtable entries.
+ * The B field is 2 bits; the values 2 and 3 are unused and reserved.
+ */
+#define MMU_SEGSIZE_256M 0
+#define MMU_SEGSIZE_1T 1
+
+
+#ifndef __ASSEMBLY__
+
+/*
+ * The current system page and segment sizes
+ */
+extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
+extern int mmu_linear_psize;
+extern int mmu_virtual_psize;
+extern int mmu_vmalloc_psize;
+extern int mmu_vmemmap_psize;
+extern int mmu_io_psize;
+extern int mmu_kernel_ssize;
+extern int mmu_highuser_ssize;
+extern u16 mmu_slb_size;
+extern unsigned long tce_alloc_start, tce_alloc_end;
+
+/*
+ * If the processor supports 64k normal pages but not 64k cache
+ * inhibited pages, we have to be prepared to switch processes
+ * to use 4k pages when they create cache-inhibited mappings.
+ * If this is the case, mmu_ci_restrictions will be set to 1.
+ */
+extern int mmu_ci_restrictions;
+
+#ifdef CONFIG_HUGETLB_PAGE
+/*
+ * The page size indexes of the huge pages for use by hugetlbfs
+ */
+extern unsigned int mmu_huge_psizes[MMU_PAGE_COUNT];
+
+#endif /* CONFIG_HUGETLB_PAGE */
+
+/*
+ * This function sets the AVPN and L fields of the HPTE appropriately
+ * for the page size
+ */
+static inline unsigned long hpte_encode_v(unsigned long va, int psize,
+ int ssize)
+{
+ unsigned long v;
+ v = (va >> 23) & ~(mmu_psize_defs[psize].avpnm);
+ v <<= HPTE_V_AVPN_SHIFT;
+ if (psize != MMU_PAGE_4K)
+ v |= HPTE_V_LARGE;
+ v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT;
+ return v;
+}
+
+/*
+ * This function sets the ARPN, and LP fields of the HPTE appropriately
+ * for the page size. We assume the pa is already "clean" that is properly
+ * aligned for the requested page size
+ */
+static inline unsigned long hpte_encode_r(unsigned long pa, int psize)
+{
+ unsigned long r;
+
+ /* A 4K page needs no special encoding */
+ if (psize == MMU_PAGE_4K)
+ return pa & HPTE_R_RPN;
+ else {
+ unsigned int penc = mmu_psize_defs[psize].penc;
+ unsigned int shift = mmu_psize_defs[psize].shift;
+ return (pa & ~((1ul << shift) - 1)) | (penc << 12);
+ }
+ return r;
+}
+
+/*
+ * Build a VA given VSID, EA and segment size
+ */
+static inline unsigned long hpt_va(unsigned long ea, unsigned long vsid,
+ int ssize)
+{
+ if (ssize == MMU_SEGSIZE_256M)
+ return (vsid << 28) | (ea & 0xfffffffUL);
+ return (vsid << 40) | (ea & 0xffffffffffUL);
+}
+
+/*
+ * This hashes a virtual address
+ */
+
+static inline unsigned long hpt_hash(unsigned long va, unsigned int shift,
+ int ssize)
+{
+ unsigned long hash, vsid;
+
+ if (ssize == MMU_SEGSIZE_256M) {
+ hash = (va >> 28) ^ ((va & 0x0fffffffUL) >> shift);
+ } else {
+ vsid = va >> 40;
+ hash = vsid ^ (vsid << 25) ^ ((va & 0xffffffffffUL) >> shift);
+ }
+ return hash & 0x7fffffffffUL;
+}
+
+extern int __hash_page_4K(unsigned long ea, unsigned long access,
+ unsigned long vsid, pte_t *ptep, unsigned long trap,
+ unsigned int local, int ssize, int subpage_prot);
+extern int __hash_page_64K(unsigned long ea, unsigned long access,
+ unsigned long vsid, pte_t *ptep, unsigned long trap,
+ unsigned int local, int ssize);
+struct mm_struct;
+extern int hash_page(unsigned long ea, unsigned long access, unsigned long trap);
+extern int hash_huge_page(struct mm_struct *mm, unsigned long access,
+ unsigned long ea, unsigned long vsid, int local,
+ unsigned long trap);
+
+extern int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
+ unsigned long pstart, unsigned long mode,
+ int psize, int ssize);
+extern void set_huge_psize(int psize);
+extern void add_gpage(unsigned long addr, unsigned long page_size,
+ unsigned long number_of_pages);
+extern void demote_segment_4k(struct mm_struct *mm, unsigned long addr);
+
+extern void htab_initialize(void);
+extern void htab_initialize_secondary(void);
+extern void hpte_init_native(void);
+extern void hpte_init_lpar(void);
+extern void hpte_init_iSeries(void);
+extern void hpte_init_beat(void);
+extern void hpte_init_beat_v3(void);
+
+extern void stabs_alloc(void);
+extern void slb_initialize(void);
+extern void slb_flush_and_rebolt(void);
+extern void stab_initialize(unsigned long stab);
+
+extern void slb_vmalloc_update(void);
+#endif /* __ASSEMBLY__ */
+
+/*
+ * VSID allocation
+ *
+ * We first generate a 36-bit "proto-VSID". For kernel addresses this
+ * is equal to the ESID, for user addresses it is:
+ * (context << 15) | (esid & 0x7fff)
+ *
+ * The two forms are distinguishable because the top bit is 0 for user
+ * addresses, whereas the top two bits are 1 for kernel addresses.
+ * Proto-VSIDs with the top two bits equal to 0b10 are reserved for
+ * now.
+ *
+ * The proto-VSIDs are then scrambled into real VSIDs with the
+ * multiplicative hash:
+ *
+ * VSID = (proto-VSID * VSID_MULTIPLIER) % VSID_MODULUS
+ * where VSID_MULTIPLIER = 268435399 = 0xFFFFFC7
+ * VSID_MODULUS = 2^36-1 = 0xFFFFFFFFF
+ *
+ * This scramble is only well defined for proto-VSIDs below
+ * 0xFFFFFFFFF, so both proto-VSID and actual VSID 0xFFFFFFFFF are
+ * reserved. VSID_MULTIPLIER is prime, so in particular it is
+ * co-prime to VSID_MODULUS, making this a 1:1 scrambling function.
+ * Because the modulus is 2^n-1 we can compute it efficiently without
+ * a divide or extra multiply (see below).
+ *
+ * This scheme has several advantages over older methods:
+ *
+ * - We have VSIDs allocated for every kernel address
+ * (i.e. everything above 0xC000000000000000), except the very top
+ * segment, which simplifies several things.
+ *
+ * - We allow for 15 significant bits of ESID and 20 bits of
+ * context for user addresses. i.e. 8T (43 bits) of address space for
+ * up to 1M contexts (although the page table structure and context
+ * allocation will need changes to take advantage of this).
+ *
+ * - The scramble function gives robust scattering in the hash
+ * table (at least based on some initial results). The previous
+ * method was more susceptible to pathological cases giving excessive
+ * hash collisions.
+ */
+/*
+ * WARNING - If you change these you must make sure the asm
+ * implementations in slb_allocate (slb_low.S), do_stab_bolted
+ * (head.S) and ASM_VSID_SCRAMBLE (below) are changed accordingly.
+ *
+ * You'll also need to change the precomputed VSID values in head.S
+ * which are used by the iSeries firmware.
+ */
+
+#define VSID_MULTIPLIER_256M ASM_CONST(200730139) /* 28-bit prime */
+#define VSID_BITS_256M 36
+#define VSID_MODULUS_256M ((1UL<<VSID_BITS_256M)-1)
+
+#define VSID_MULTIPLIER_1T ASM_CONST(12538073) /* 24-bit prime */
+#define VSID_BITS_1T 24
+#define VSID_MODULUS_1T ((1UL<<VSID_BITS_1T)-1)
+
+#define CONTEXT_BITS 19
+#define USER_ESID_BITS 16
+#define USER_ESID_BITS_1T 4
+
+#define USER_VSID_RANGE (1UL << (USER_ESID_BITS + SID_SHIFT))
+
+/*
+ * 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 VSID_BITS bits of rt. The higher
+ * bits may contain other garbage, so you may need to mask the
+ * result.
+ */
+#define ASM_VSID_SCRAMBLE(rt, rx, size) \
+ lis rx,VSID_MULTIPLIER_##size@h; \
+ ori rx,rx,VSID_MULTIPLIER_##size@l; \
+ mulld rt,rt,rx; /* rt = rt * MULTIPLIER */ \
+ \
+ srdi rx,rt,VSID_BITS_##size; \
+ clrldi rt,rt,(64-VSID_BITS_##size); \
+ 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_##size; /* extract 2^VSID_BITS bit */ \
+ add rt,rt,rx
+
+
+#ifndef __ASSEMBLY__
+
+typedef unsigned long mm_context_id_t;
+
+typedef struct {
+ mm_context_id_t id;
+ u16 user_psize; /* page size index */
+
+#ifdef CONFIG_PPC_MM_SLICES
+ u64 low_slices_psize; /* SLB page size encodings */
+ u64 high_slices_psize; /* 4 bits per slice for now */
+#else
+ u16 sllp; /* SLB page size encoding */
+#endif
+ unsigned long vdso_base;
+} mm_context_t;
+
+
+#if 0
+/*
+ * The code below is equivalent to this function for arguments
+ * < 2^VSID_BITS, which is all this should ever be called
+ * with. However gcc is not clever enough to compute the
+ * modulus (2^n-1) without a second multiply.
+ */
+#define vsid_scrample(protovsid, size) \
+ ((((protovsid) * VSID_MULTIPLIER_##size) % VSID_MODULUS_##size))
+
+#else /* 1 */
+#define vsid_scramble(protovsid, size) \
+ ({ \
+ unsigned long x; \
+ x = (protovsid) * VSID_MULTIPLIER_##size; \
+ x = (x >> VSID_BITS_##size) + (x & VSID_MODULUS_##size); \
+ (x + ((x+1) >> VSID_BITS_##size)) & VSID_MODULUS_##size; \
+ })
+#endif /* 1 */
+
+/* This is only valid for addresses >= KERNELBASE */
+static inline unsigned long get_kernel_vsid(unsigned long ea, int ssize)
+{
+ if (ssize == MMU_SEGSIZE_256M)
+ return vsid_scramble(ea >> SID_SHIFT, 256M);
+ return vsid_scramble(ea >> SID_SHIFT_1T, 1T);
+}
+
+/* Returns the segment size indicator for a user address */
+static inline int user_segment_size(unsigned long addr)
+{
+ /* Use 1T segments if possible for addresses >= 1T */
+ if (addr >= (1UL << SID_SHIFT_1T))
+ return mmu_highuser_ssize;
+ return MMU_SEGSIZE_256M;
+}
+
+/* This is only valid for user addresses (which are below 2^44) */
+static inline unsigned long get_vsid(unsigned long context, unsigned long ea,
+ int ssize)
+{
+ if (ssize == MMU_SEGSIZE_256M)
+ return vsid_scramble((context << USER_ESID_BITS)
+ | (ea >> SID_SHIFT), 256M);
+ return vsid_scramble((context << USER_ESID_BITS_1T)
+ | (ea >> SID_SHIFT_1T), 1T);
+}
+
+/*
+ * This is only used on legacy iSeries in lparmap.c,
+ * hence the 256MB segment assumption.
+ */
+#define VSID_SCRAMBLE(pvsid) (((pvsid) * VSID_MULTIPLIER_256M) % \
+ VSID_MODULUS_256M)
+#define KERNEL_VSID(ea) VSID_SCRAMBLE(GET_ESID(ea))
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _ASM_POWERPC_MMU_HASH64_H_ */