2 * Copyright (c) 1992, 1993
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5 * This code is derived from software developed by the Computer Systems
6 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
7 * BG 91-66 and contributed to Berkeley.
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33 * @(#)kvm_sparc.c 8.1 (Berkeley) 6/4/93
34 * $FreeBSD: src/lib/libkvm/kvm_sparc.c,v 1.3 1999/12/27 07:14:58 peter Exp $
38 * Sparc machine dependent routines for kvm. Hopefully, the forthcoming
39 * vm code will one day obsolete this module.
42 #include <sys/user.h> /* MUST BE FIRST */
43 #include <sys/param.h>
51 #include <vm/vm_param.h>
55 #include "kvm_private.h"
59 /* XXX from sparc/pmap.c */
60 #define MAXMEM (128 * 1024 * 1024) /* no more than 128 MB phys mem */
61 #define NPGBANK 16 /* 2^4 pages per bank (64K / bank) */
62 #define BSHIFT 4 /* log2(NPGBANK) */
63 #define BOFFSET (NPGBANK - 1)
64 #define BTSIZE (MAXMEM / NBPG / NPGBANK)
65 #define HWTOSW(pmap_stod, pg) (pmap_stod[(pg) >> BSHIFT] | ((pg) & BOFFSET))
69 int pmeg[NPMEG][NPTESG];
70 int pmap_stod[BTSIZE]; /* dense to sparse */
74 _kvm_freevtop(kvm_t *kd)
81 _kvm_initvtop(kvm_t *kd)
87 struct nlist nlist[2];
89 vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
95 if (fstat(kd->pmfd, &st) < 0)
100 off = st.st_size - ctob(btoc(sizeof(vm->segmap)));
102 if (lseek(kd->pmfd, (off_t)off, 0) == -1 && errno != 0 ||
103 read(kd->pmfd, (char *)vm->segmap, sizeof(vm->segmap)) < 0) {
104 _kvm_err(kd, kd->program, "cannot read segment map");
110 off = st.st_size - ctob(btoc(sizeof(vm->pmeg)) +
111 btoc(sizeof(vm->segmap)));
113 if (lseek(kd->pmfd, (off_t)off, 0) == -1 && errno != 0 ||
114 read(kd->pmfd, (char *)vm->pmeg, sizeof(vm->pmeg)) < 0) {
115 _kvm_err(kd, kd->program, "cannot read PMEG table");
119 * Make pmap_stod be an identity map so we can bootstrap it in.
120 * We assume it's in the first contiguous chunk of physical memory.
122 for (i = 0; i < BTSIZE; ++i)
123 vm->pmap_stod[i] = i << 4;
126 * It's okay to do this nlist separately from the one kvm_getprocs()
127 * does, since the only time we could gain anything by combining
128 * them is if we do a kvm_getprocs() on a dead kernel, which is
131 nlist[0].n_name = "_pmap_stod";
133 if (kvm_nlist(kd, nlist) != 0) {
134 _kvm_err(kd, kd->program, "pmap_stod: no such symbol");
137 if (kvm_read(kd, (u_long)nlist[0].n_value,
138 (char *)vm->pmap_stod, sizeof(vm->pmap_stod))
139 != sizeof(vm->pmap_stod)) {
140 _kvm_err(kd, kd->program, "cannot read pmap_stod");
146 #define VA_OFF(va) (va & (NBPG - 1))
149 * Translate a user virtual address to a physical address.
152 _kvm_uvatop(kvm_t *kd, const struct proc *p, u_long va, u_long *pa)
156 struct vmspace *vms = p->p_vmspace;
158 if ((u_long)vms < KERNBASE) {
159 _kvm_err(kd, kd->program, "_kvm_uvatop: corrupt proc");
165 * Get the PTE. This takes two steps. We read the
166 * base address of the table, then we index it.
167 * Note that the index pte table is indexed by
168 * virtual segment rather than physical segment.
170 kva = (u_long)&vms->vm_pmap.pm_rpte[VA_VSEG(va)];
171 if (kvm_read(kd, kva, (char *)&kva, 4) != 4 || kva == 0)
173 kva += sizeof(vms->vm_pmap.pm_rpte[0]) * VA_VPG(va);
174 if (kvm_read(kd, kva, (char *)&pte, 4) == 4 && (pte & PG_V)) {
177 * /dev/mem adheres to the hardware model of physical memory
178 * (with holes in the address space), while crashdumps
179 * adhere to the contiguous software model.
182 frame = pte & PG_PFNUM;
184 frame = HWTOSW(kd->vmst->pmap_stod, pte & PG_PFNUM);
185 *pa = (frame << PGSHIFT) | off;
189 _kvm_err(kd, 0, "invalid address (%x)", va);
194 * Translate a kernel virtual address to a physical address using the
195 * mapping information in kd->vm. Returns the result in pa, and returns
196 * the number of bytes that are contiguously available from this
197 * physical address. This routine is used only for crashdumps.
200 _kvm_kvatop(kvm_t *kd, u_long va, u_long *pa)
207 if (va >= KERNBASE) {
209 s = vm->segmap[VA_VSEG(va) - NUSEG];
210 pte = vm->pmeg[s][VA_VPG(va)];
211 if ((pte & PG_V) != 0) {
213 *pa = (HWTOSW(vm->pmap_stod, pte & PG_PFNUM)
219 _kvm_err(kd, 0, "invalid address (%x)", va);