tools/llvm: Do not build with symbols
[minix3.git] / minix / servers / vm / mem_shared.c
blobd51029111f41fde1393be14c3e57837cd1c4d32b
2 /* This file implements the methods of shared memory. */
4 #include <assert.h>
6 #include "proto.h"
7 #include "vm.h"
8 #include "region.h"
9 #include "glo.h"
11 /* These functions are static so as to not pollute the
12 * global namespace, and are accessed through their function
13 * pointers.
16 static int shared_unreference(struct phys_region *pr);
17 static int shared_pagefault(struct vmproc *vmp, struct vir_region *region,
18 struct phys_region *ph, int write, vfs_callback_t cb, void *state,
19 int len, int *io);
20 static int shared_sanitycheck(struct phys_region *pr, const char *file, int line);
21 static int shared_writable(struct phys_region *pr);
22 static void shared_delete(struct vir_region *region);
23 static u32_t shared_regionid(struct vir_region *region);
24 static int shared_copy(struct vir_region *vr, struct vir_region *newvr);
25 static int shared_refcount(struct vir_region *vr);
26 static int shared_pt_flags(struct vir_region *vr);
28 struct mem_type mem_type_shared = {
29 .name = "shared memory",
30 .ev_copy = shared_copy,
31 .ev_unreference = shared_unreference,
32 .ev_pagefault = shared_pagefault,
33 .ev_sanitycheck = shared_sanitycheck,
34 .ev_delete = shared_delete,
35 .regionid = shared_regionid,
36 .refcount = shared_refcount,
37 .writable = shared_writable,
38 .pt_flags = shared_pt_flags,
41 static int shared_pt_flags(struct vir_region *vr){
42 #if defined(__arm__)
43 return ARM_VM_PTE_CACHED;
44 #else
45 return 0;
46 #endif
49 static int shared_unreference(struct phys_region *pr)
51 return mem_type_anon.ev_unreference(pr);
54 static int getsrc(struct vir_region *region,
55 struct vmproc **vmp, struct vir_region **r)
57 int srcproc;
59 if(region->def_memtype != &mem_type_shared) {
60 printf("shared region hasn't shared type but %s.\n",
61 region->def_memtype->name);
62 return EINVAL;
65 if(!region->param.shared.ep || !region->param.shared.vaddr) {
66 printf("shared region has not defined source region.\n");
67 util_stacktrace();
68 return EINVAL;
71 if(vm_isokendpt((endpoint_t) region->param.shared.ep, &srcproc) != OK) {
72 printf("VM: shared memory with missing source process.\n");
73 util_stacktrace();
74 return EINVAL;
77 *vmp = &vmproc[srcproc];
79 if(!(*r=map_lookup(*vmp, region->param.shared.vaddr, NULL))) {
80 printf("VM: shared memory with missing vaddr 0x%lx.\n",
81 region->param.shared.vaddr);
82 return EINVAL;
85 if((*r)->def_memtype != &mem_type_anon) {
86 printf("source region hasn't anon type but %s.\n",
87 (*r)->def_memtype->name);
88 return EINVAL;
91 if(region->param.shared.id != (*r)->id) {
92 printf("source region has no matching id\n");
93 return EINVAL;
96 return OK;
99 static u32_t shared_regionid(struct vir_region *vr)
101 struct vir_region *src_region;
102 struct vmproc *src_vmp;
104 if(getsrc(vr, &src_vmp, &src_region) != OK)
105 return 0;
107 return src_region->id;
110 static void shared_delete(struct vir_region *region)
112 struct vir_region *src_region;
113 struct vmproc *src_vmp;
115 if(getsrc(region, &src_vmp, &src_region) != OK)
116 return;
118 assert(src_region->remaps > 0);
119 src_region->remaps--;
122 static int shared_pagefault(struct vmproc *vmp, struct vir_region *region,
123 struct phys_region *ph, int write, vfs_callback_t cb,
124 void *state, int statelen, int *io)
126 struct vir_region *src_region;
127 struct vmproc *src_vmp;
128 struct phys_region *pr;
130 if(getsrc(region, &src_vmp, &src_region) != OK) {
131 return EINVAL;
134 assert(ph->ph->phys == MAP_NONE);
135 pb_free(ph->ph);
137 if(!(pr = physblock_get(src_region, ph->offset))) {
138 int r;
139 if((r=map_pf(src_vmp, src_region, ph->offset, write,
140 NULL, NULL, 0, io)) != OK)
141 return r;
142 if(!(pr = physblock_get(src_region, ph->offset))) {
143 panic("missing region after pagefault handling");
147 pb_link(ph, pr->ph, ph->offset, region);
149 return OK;
152 static int shared_sanitycheck(struct phys_region *pr, const char *file, int line)
154 return OK;
157 static int shared_writable(struct phys_region *pr)
159 assert(pr->ph->refcount > 0);
160 return pr->ph->phys != MAP_NONE;
163 void shared_setsource(struct vir_region *vr, endpoint_t ep,
164 struct vir_region *src_vr)
166 struct vmproc *vmp;
167 struct vir_region *srcvr;
168 int id = src_vr->id;
169 vir_bytes vaddr = src_vr->vaddr;
171 assert(vr->def_memtype == &mem_type_shared);
173 if(!ep || !vaddr || !id) {
174 printf("VM: shared_setsource: zero ep/vaddr/id - ignoring\n");
175 return;
178 vr->param.shared.ep = ep;
179 vr->param.shared.vaddr = vaddr;
180 vr->param.shared.id = id;
182 if(getsrc(vr, &vmp, &srcvr) != OK)
183 panic("initial getsrc failed");
185 assert(srcvr == src_vr);
187 srcvr->remaps++;
190 static int shared_copy(struct vir_region *vr, struct vir_region *newvr)
192 struct vmproc *vmp;
193 struct vir_region *srcvr;
195 if(getsrc(vr, &vmp, &srcvr) != OK)
196 panic("copy: original getsrc failed");
198 shared_setsource(newvr, vr->param.shared.ep, srcvr);
200 return OK;
203 static int shared_refcount(struct vir_region *vr)
205 return 1 + vr->remaps;