Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/include/asm-ppc64/mmu.h b/include/asm-ppc64/mmu.h
new file mode 100644
index 0000000..188987e
--- /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_ */