summaryrefslogtreecommitdiffstats
path: root/sys/boot/i386/libi386/bootinfo32.c
diff options
context:
space:
mode:
Diffstat (limited to 'sys/boot/i386/libi386/bootinfo32.c')
-rw-r--r--sys/boot/i386/libi386/bootinfo32.c273
1 files changed, 273 insertions, 0 deletions
diff --git a/sys/boot/i386/libi386/bootinfo32.c b/sys/boot/i386/libi386/bootinfo32.c
new file mode 100644
index 0000000..ceb254c
--- /dev/null
+++ b/sys/boot/i386/libi386/bootinfo32.c
@@ -0,0 +1,273 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+#include <sys/param.h>
+#include <sys/reboot.h>
+#include <sys/linker.h>
+#include <machine/bootinfo.h>
+#include "bootstrap.h"
+#include "libi386.h"
+#include "btxv86.h"
+
+static struct bootinfo bi;
+
+/*
+ * Copy module-related data into the load area, where it can be
+ * used as a directory for loaded modules.
+ *
+ * Module data is presented in a self-describing format. Each datum
+ * is preceded by a 32-bit identifier and a 32-bit size field.
+ *
+ * Currently, the following data are saved:
+ *
+ * MOD_NAME (variable) module name (string)
+ * MOD_TYPE (variable) module type (string)
+ * MOD_ARGS (variable) module parameters (string)
+ * MOD_ADDR sizeof(vm_offset_t) module load address
+ * MOD_SIZE sizeof(size_t) module size
+ * MOD_METADATA (variable) type-specific metadata
+ */
+#define COPY32(v, a, c) { \
+ u_int32_t x = (v); \
+ if (c) \
+ i386_copyin(&x, a, sizeof(x)); \
+ a += sizeof(x); \
+}
+
+#define MOD_STR(t, a, s, c) { \
+ COPY32(t, a, c); \
+ COPY32(strlen(s) + 1, a, c); \
+ if (c) \
+ i386_copyin(s, a, strlen(s) + 1); \
+ a += roundup(strlen(s) + 1, sizeof(u_long));\
+}
+
+#define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c)
+#define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c)
+#define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c)
+
+#define MOD_VAR(t, a, s, c) { \
+ COPY32(t, a, c); \
+ COPY32(sizeof(s), a, c); \
+ if (c) \
+ i386_copyin(&s, a, sizeof(s)); \
+ a += roundup(sizeof(s), sizeof(u_long)); \
+}
+
+#define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c)
+#define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c)
+
+#define MOD_METADATA(a, mm, c) { \
+ COPY32(MODINFO_METADATA | mm->md_type, a, c); \
+ COPY32(mm->md_size, a, c); \
+ if (c) \
+ i386_copyin(mm->md_data, a, mm->md_size); \
+ a += roundup(mm->md_size, sizeof(u_long));\
+}
+
+#define MOD_END(a, c) { \
+ COPY32(MODINFO_END, a, c); \
+ COPY32(0, a, c); \
+}
+
+static vm_offset_t
+bi_copymodules32(vm_offset_t addr)
+{
+ struct preloaded_file *fp;
+ struct file_metadata *md;
+ int c;
+
+ c = addr != 0;
+ /* start with the first module on the list, should be the kernel */
+ for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
+
+ MOD_NAME(addr, fp->f_name, c); /* this field must come first */
+ MOD_TYPE(addr, fp->f_type, c);
+ if (fp->f_args)
+ MOD_ARGS(addr, fp->f_args, c);
+ MOD_ADDR(addr, fp->f_addr, c);
+ MOD_SIZE(addr, fp->f_size, c);
+ for (md = fp->f_metadata; md != NULL; md = md->md_next)
+ if (!(md->md_type & MODINFOMD_NOCOPY))
+ MOD_METADATA(addr, md, c);
+ }
+ MOD_END(addr, c);
+ return(addr);
+}
+
+/*
+ * Load the information expected by an i386 kernel.
+ *
+ * - The 'boothowto' argument is constructed
+ * - The 'bootdev' argument is constructed
+ * - The 'bootinfo' struct is constructed, and copied into the kernel space.
+ * - The kernel environment is copied into kernel space.
+ * - Module metadata are formatted and placed in kernel space.
+ */
+int
+bi_load32(char *args, int *howtop, int *bootdevp, vm_offset_t *bip, vm_offset_t *modulep, vm_offset_t *kernendp)
+{
+ struct preloaded_file *xp, *kfp;
+ struct i386_devdesc *rootdev;
+ struct file_metadata *md;
+ vm_offset_t addr;
+ vm_offset_t kernend;
+ vm_offset_t envp;
+ vm_offset_t size;
+ vm_offset_t ssym, esym;
+ char *rootdevname;
+ int bootdevnr, i, howto;
+ char *kernelname;
+ const char *kernelpath;
+
+ howto = bi_getboothowto(args);
+
+ /*
+ * Allow the environment variable 'rootdev' to override the supplied device
+ * This should perhaps go to MI code and/or have $rootdev tested/set by
+ * MI code before launching the kernel.
+ */
+ rootdevname = getenv("rootdev");
+ i386_getdev((void **)(&rootdev), rootdevname, NULL);
+ if (rootdev == NULL) { /* bad $rootdev/$currdev */
+ printf("can't determine root device\n");
+ return(EINVAL);
+ }
+
+ /* Try reading the /etc/fstab file to select the root device */
+ getrootmount(i386_fmtdev((void *)rootdev));
+
+ /* Do legacy rootdev guessing */
+
+ /* XXX - use a default bootdev of 0. Is this ok??? */
+ bootdevnr = 0;
+
+ switch(rootdev->d_type) {
+ case DEVT_CD:
+ /* Pass in BIOS device number. */
+ bi.bi_bios_dev = bc_unit2bios(rootdev->d_kind.bioscd.unit);
+ bootdevnr = bc_getdev(rootdev);
+ break;
+
+ case DEVT_DISK:
+ /* pass in the BIOS device number of the current disk */
+ bi.bi_bios_dev = bd_unit2bios(rootdev->d_kind.biosdisk.unit);
+ bootdevnr = bd_getdev(rootdev);
+ break;
+
+ case DEVT_NET:
+ break;
+
+ default:
+ printf("WARNING - don't know how to boot from device type %d\n", rootdev->d_type);
+ }
+ if (bootdevnr == -1) {
+ printf("root device %s invalid\n", i386_fmtdev(rootdev));
+ return (EINVAL);
+ }
+ free(rootdev);
+
+ /* find the last module in the chain */
+ addr = 0;
+ for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
+ if (addr < (xp->f_addr + xp->f_size))
+ addr = xp->f_addr + xp->f_size;
+ }
+ /* pad to a page boundary */
+ addr = roundup(addr, PAGE_SIZE);
+
+ /* copy our environment */
+ envp = addr;
+ addr = bi_copyenv(addr);
+
+ /* pad to a page boundary */
+ addr = roundup(addr, PAGE_SIZE);
+
+ kfp = file_findfile(NULL, "elf kernel");
+ if (kfp == NULL)
+ kfp = file_findfile(NULL, "elf32 kernel");
+ if (kfp == NULL)
+ panic("can't find kernel file");
+ kernend = 0; /* fill it in later */
+ file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof howto, &howto);
+ file_addmetadata(kfp, MODINFOMD_ENVP, sizeof envp, &envp);
+ file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof kernend, &kernend);
+ bios_addsmapdata(kfp);
+
+ /* Figure out the size and location of the metadata */
+ *modulep = addr;
+ size = bi_copymodules32(0);
+ kernend = roundup(addr + size, PAGE_SIZE);
+ *kernendp = kernend;
+
+ /* patch MODINFOMD_KERNEND */
+ md = file_findmetadata(kfp, MODINFOMD_KERNEND);
+ bcopy(&kernend, md->md_data, sizeof kernend);
+
+ /* copy module list and metadata */
+ (void)bi_copymodules32(addr);
+
+ ssym = esym = 0;
+ md = file_findmetadata(kfp, MODINFOMD_SSYM);
+ if (md != NULL)
+ ssym = *((vm_offset_t *)&(md->md_data));
+ md = file_findmetadata(kfp, MODINFOMD_ESYM);
+ if (md != NULL)
+ esym = *((vm_offset_t *)&(md->md_data));
+ if (ssym == 0 || esym == 0)
+ ssym = esym = 0; /* sanity */
+
+ /* legacy bootinfo structure */
+ kernelname = getenv("kernelname");
+ i386_getdev(NULL, kernelname, &kernelpath);
+ bi.bi_version = BOOTINFO_VERSION;
+ bi.bi_kernelname = 0; /* XXX char * -> kernel name */
+ bi.bi_nfs_diskless = 0; /* struct nfs_diskless * */
+ bi.bi_n_bios_used = 0; /* XXX would have to hook biosdisk driver for these */
+ for (i = 0; i < N_BIOS_GEOM; i++)
+ bi.bi_bios_geom[i] = bd_getbigeom(i);
+ bi.bi_size = sizeof(bi);
+ bi.bi_memsizes_valid = 1;
+ bi.bi_basemem = bios_basemem / 1024;
+ bi.bi_extmem = bios_extmem / 1024;
+ bi.bi_envp = envp;
+ bi.bi_modulep = *modulep;
+ bi.bi_kernend = kernend;
+ bi.bi_kernelname = VTOP(kernelpath);
+ bi.bi_symtab = ssym; /* XXX this is only the primary kernel symtab */
+ bi.bi_esymtab = esym;
+
+ /* legacy boot arguments */
+ *howtop = howto | RB_BOOTINFO;
+ *bootdevp = bootdevnr;
+ *bip = VTOP(&bi);
+
+ return(0);
+}
OpenPOWER on IntegriCloud