2 * Copyright (c) 2006 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sys/platform/vkernel/platform/init.c,v 1.14 2007/01/08 03:33:43 dillon Exp $
37 #include <sys/types.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
43 #include <sys/random.h>
44 #include <sys/vkernel.h>
47 #include <sys/msgbuf.h>
48 #include <sys/vmspace.h>
49 #include <vm/vm_page.h>
51 #include <machine/globaldata.h>
52 #include <machine/tls.h>
53 #include <machine/md_var.h>
54 #include <machine/vmparam.h>
65 vm_paddr_t phys_avail[16];
67 vm_paddr_t Maxmem_bytes;
73 vm_offset_t virtual_start;
74 vm_offset_t virtual_end;
75 vm_offset_t kernel_vm_end;
76 vm_offset_t crashdumpmap;
77 vm_offset_t clean_sva;
78 vm_offset_t clean_eva;
79 struct msgbuf *msgbufp;
82 vpte_t *KernelPTA; /* Warning: Offset for direct VA translation */
83 u_int cpu_feature; /* XXX */
84 u_int tsc_present; /* XXX */
86 struct privatespace *CPU_prvspace;
88 static struct trapframe proc0_tf;
89 static void *proc0paddr;
91 static void init_sys_memory(char *imageFile);
92 static void init_kern_memory(void);
93 static void init_globaldata(void);
94 static void init_vkernel(void);
95 static void init_rootdevice(char *imageFile);
96 static void usage(const char *ctl);
99 * Kernel startup for virtual kernels - standard main()
102 main(int ac, char **av)
104 char *memImageFile = NULL;
105 char *rootImageFile = NULL;
112 while ((c = getopt(ac, av, "vm:r:")) != -1) {
118 memImageFile = optarg;
121 rootImageFile = optarg;
124 Maxmem_bytes = strtoull(optarg, &suffix, 0);
141 usage("Bad maxmem option");
150 init_sys_memory(memImageFile);
154 init_rootdevice(rootImageFile);
162 * Initialize system memory. This is the virtual kernel's 'RAM'.
166 init_sys_memory(char *imageFile)
173 * Figure out the system memory image size. If an image file was
174 * specified and -m was not specified, use the image file's size.
177 if (imageFile && stat(imageFile, &st) == 0 && Maxmem_bytes == 0)
178 Maxmem_bytes = (vm_paddr_t)st.st_size;
179 if ((imageFile == NULL || stat(imageFile, &st) < 0) &&
181 err(1, "Cannot create new memory file %s unless "
182 "system memory size is specified with -m",
188 * Maxmem must be known at this time
190 if (Maxmem_bytes < 32 * 1024 * 1024 || (Maxmem_bytes & SEG_MASK)) {
191 err(1, "Bad maxmem specification: 32MB minimum, "
192 "multiples of %dMB only",
193 SEG_SIZE / 1024 / 1024);
198 * Generate an image file name if necessary, then open/create the
199 * file exclusively locked. Do not allow multiple virtual kernels
200 * to use the same image file.
202 if (imageFile == NULL) {
203 for (i = 0; i < 1000000; ++i) {
204 asprintf(&imageFile, "/var/vkernel/memimg.%06d", i);
206 O_RDWR|O_CREAT|O_EXLOCK|O_NONBLOCK, 0644);
207 if (fd < 0 && errno == EWOULDBLOCK) {
214 fd = open(imageFile, O_RDWR|O_CREAT|O_EXLOCK|O_NONBLOCK, 0644);
216 printf("Using memory file: %s\n", imageFile);
217 if (fd < 0 || fstat(fd, &st) < 0) {
218 err(1, "Unable to open/create %s: %s",
219 imageFile, strerror(errno));
224 * Truncate or extend the file as necessary.
226 if (st.st_size > Maxmem_bytes) {
227 ftruncate(fd, Maxmem_bytes);
228 } else if (st.st_size < Maxmem_bytes) {
230 off_t off = st.st_size & ~SEG_MASK;
232 kprintf("%s: Reserving blocks for memory image\n", imageFile);
233 zmem = malloc(SEG_SIZE);
234 bzero(zmem, SEG_SIZE);
236 while (off < Maxmem_bytes) {
237 if (write(fd, zmem, SEG_SIZE) != SEG_SIZE) {
238 err(1, "Unable to reserve blocks for memory image");
244 err(1, "Unable to reserve blocks for memory image");
248 Maxmem = Maxmem_bytes >> PAGE_SHIFT;
252 * Initialize kernel memory. This reserves kernel virtual memory by using
257 init_kern_memory(void)
265 * Memory map our kernel virtual memory space. Note that the
266 * kernel image itself is not made part of this memory for the
269 * The memory map must be segment-aligned so we can properly
272 base = mmap((void *)0x40000000, KERNEL_KVA_SIZE, PROT_READ|PROT_WRITE,
273 MAP_FILE|MAP_SHARED|MAP_VPAGETABLE, MemImageFd, 0);
274 if (base == MAP_FAILED) {
275 err(1, "Unable to mmap() kernel virtual memory!");
278 KvaStart = (vm_offset_t)base;
279 KvaSize = KERNEL_KVA_SIZE;
280 KvaEnd = KvaStart + KvaSize;
283 * Create a top-level page table self-mapping itself.
285 * Initialize the page directory at physical page index 0 to point
286 * to an array of page table pages starting at physical page index 1
288 lseek(MemImageFd, 0L, 0);
289 for (i = 0; i < KERNEL_KVA_SIZE / SEG_SIZE; ++i) {
290 pte = ((i + 1) * PAGE_SIZE) | VPTE_V | VPTE_R | VPTE_W;
291 write(MemImageFd, &pte, sizeof(pte));
295 * Initialize the PTEs in the page table pages required to map the
296 * page table itself. This includes mapping the page directory page
297 * at the base so we go one more loop then normal.
299 lseek(MemImageFd, PAGE_SIZE, 0);
300 for (i = 0; i <= KERNEL_KVA_SIZE / SEG_SIZE * sizeof(vpte_t); ++i) {
301 pte = (i * PAGE_SIZE) | VPTE_V | VPTE_R | VPTE_W;
302 write(MemImageFd, &pte, sizeof(pte));
306 * Initialize remaining PTEs to 0. We may be reusing a memory image
307 * file. This is approximately a megabyte.
309 i = (KERNEL_KVA_SIZE / PAGE_SIZE - i) * sizeof(pte);
310 zero = malloc(PAGE_SIZE);
312 write(MemImageFd, zero, (i > PAGE_SIZE) ? PAGE_SIZE : i);
313 i = i - ((i > PAGE_SIZE) ? PAGE_SIZE : i);
318 * Enable the page table and calculate pointers to our self-map
319 * for easy kernel page table manipulation.
321 * KernelPTA must be offset so we can do direct VA translations
323 mcontrol(base, KERNEL_KVA_SIZE, MADV_SETMAP,
324 0 | VPTE_R | VPTE_W | VPTE_V);
325 KernelPTD = (vpte_t *)base; /* pg directory */
326 KernelPTA = (vpte_t *)((char *)base + PAGE_SIZE); /* pg table pages */
327 KernelPTA -= KvaStart >> PAGE_SHIFT;
330 * phys_avail[] represents unallocated physical memory. MI code
331 * will use phys_avail[] to create the vm_page array.
333 phys_avail[0] = PAGE_SIZE +
334 KERNEL_KVA_SIZE / PAGE_SIZE * sizeof(vpte_t);
335 phys_avail[0] = (phys_avail[0] + PAGE_MASK) & ~(vm_paddr_t)PAGE_MASK;
336 phys_avail[1] = Maxmem_bytes;
339 * (virtual_start, virtual_end) represent unallocated kernel virtual
340 * memory. MI code will create kernel_map using these parameters.
342 virtual_start = KvaStart + PAGE_SIZE +
343 KERNEL_KVA_SIZE / PAGE_SIZE * sizeof(vpte_t);
344 virtual_start = (virtual_start + PAGE_MASK) & ~(vm_offset_t)PAGE_MASK;
345 virtual_end = KvaStart + KERNEL_KVA_SIZE;
348 * Because we just pre-allocate the entire page table the demark used
349 * to determine when KVM must be grown is just set to the end of
350 * KVM. pmap_growkernel() simply panics.
352 kernel_vm_end = virtual_end;
355 * Allocate space for process 0's UAREA.
357 proc0paddr = (void *)virtual_start;
358 for (i = 0; i < UPAGES; ++i) {
359 pmap_kenter_quick(virtual_start, phys_avail[0]);
360 virtual_start += PAGE_SIZE;
361 phys_avail[0] += PAGE_SIZE;
367 crashdumpmap = virtual_start;
368 virtual_start += MAXDUMPPGS * PAGE_SIZE;
371 * msgbufp maps the system message buffer
373 assert((MSGBUF_SIZE & PAGE_MASK) == 0);
374 msgbufp = (void *)virtual_start;
375 for (i = 0; i < (MSGBUF_SIZE >> PAGE_SHIFT); ++i) {
376 pmap_kenter_quick(virtual_start, phys_avail[0]);
377 virtual_start += PAGE_SIZE;
378 phys_avail[0] += PAGE_SIZE;
380 msgbufinit(msgbufp, MSGBUF_SIZE);
383 * used by kern_memio for /dev/mem access
385 ptvmmap = (caddr_t)virtual_start;
386 virtual_start += PAGE_SIZE;
389 * Bootstrap the kernel_pmap
395 * Map the per-cpu globaldata for cpu #0. Allocate the space using
396 * virtual_start and phys_avail[0]
400 init_globaldata(void)
407 * Reserve enough KVA to cover possible cpus. This is a considerable
408 * amount of KVA since the privatespace structure includes two
409 * whole page table mappings.
411 virtual_start = (virtual_start + SEG_MASK) & ~(vm_offset_t)SEG_MASK;
412 CPU_prvspace = (void *)virtual_start;
413 virtual_start += sizeof(struct privatespace) * SMP_MAXCPU;
416 * Allocate enough physical memory to cover the mdglobaldata
417 * portion of the space and the idle stack and map the pages
418 * into KVA. For cpu #0 only.
420 for (i = 0; i < sizeof(struct mdglobaldata); i += PAGE_SIZE) {
422 va = (vm_offset_t)&CPU_prvspace[0].mdglobaldata + i;
423 pmap_kenter_quick(va, pa);
424 phys_avail[0] += PAGE_SIZE;
426 for (i = 0; i < sizeof(CPU_prvspace[0].idlestack); i += PAGE_SIZE) {
428 va = (vm_offset_t)&CPU_prvspace[0].idlestack + i;
429 pmap_kenter_quick(va, pa);
430 phys_avail[0] += PAGE_SIZE;
434 * Setup the %gs for cpu #0. The mycpu macro works after this
437 tls_set_fs(&CPU_prvspace[0], sizeof(struct privatespace));
441 * Initialize very low level systems including thread0, proc0, etc.
447 struct mdglobaldata *gd;
449 gd = &CPU_prvspace[0].mdglobaldata;
450 bzero(gd, sizeof(*gd));
452 gd->mi.gd_curthread = &thread0;
453 thread0.td_gd = &gd->mi;
457 gd->mi.gd_prvspace = &CPU_prvspace[0];
458 mi_gdinit(&gd->mi, 0);
460 mi_proc0init(&gd->mi, proc0paddr);
461 proc0.p_lwp.lwp_md.md_regs = &proc0_tf;
466 #if 0 /* #ifdef DDB */
468 if (boothowto & RB_KDB)
469 Debugger("Boot flags requested debugger");
472 initializecpu(); /* Initialize CPU registers */
474 init_param2((phys_avail[1] - phys_avail[0]) / PAGE_SIZE);
478 * Map the message buffer
480 for (off = 0; off < round_page(MSGBUF_SIZE); off += PAGE_SIZE)
481 pmap_kenter((vm_offset_t)msgbufp + off, avail_end + off);
482 msgbufinit(msgbufp, MSGBUF_SIZE);
485 thread0.td_pcb_cr3 ... MMU
486 proc0.p_lwp.lwp_md.md_regs = &proc0_tf;
491 * The root filesystem path for the virtual kernel is optional. If specified
492 * it points to a filesystem image.
496 init_rootdevice(char *imageFile)
501 RootImageFd = open(imageFile, O_RDWR, 0644);
502 if (RootImageFd < 0 || fstat(RootImageFd, &st) < 0) {
503 err(1, "Unable to open/create %s: %s",
504 imageFile, strerror(errno));
507 rootdevnames[0] = "ufs:vd0a";
513 usage(const char *ctl)
521 kprintf("cpu reset\n");
528 kprintf("cpu halt\n");
530 __asm__ __volatile("hlt");