389e4c3a2a
and instead add platform, firmware and EFI stubs to the loader. The net effect of this change is that besides a special console and disk driver, the kernel has no knowledge of the simulator. This has the following advantages: o Simulator support is much harder to break, o It's easier to make use of more feature complete simulators. This would only need a change in the simulator specific loader, o Running SMP kernels within the simulator. Note that ski at this time does not simulate IPIs, so there's no way to start APs. The platform, firmware and EFI stubs describe the following hardware: o 4 CPU Itanium, o 128 MB RAM within the 4GB address space, o 64 MB RAM above the 4GB address space. NOTE: The stubs in the skiloader describe a machine that should in parts be defined by the simulator. Things like processor interrupt block and AP wakeup vector cannot be choosen at random because they require interpretation by the simulator. Currently the simulator is ignorant of this. This change introduces an unofficial SSC call SSC_SAL_SET_VECTORS which is ignored by the simulator. Tested with: ski (version 0.943 for linux)
323 lines
8.5 KiB
C
323 lines
8.5 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <stand.h>
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#include <string.h>
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#include <sys/param.h>
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#include <sys/reboot.h>
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#include <sys/linker.h>
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#include <machine/elf.h>
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#include <machine/bootinfo.h>
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#include "bootstrap.h"
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/*
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* Return a 'boothowto' value corresponding to the kernel arguments in
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* (kargs) and any relevant environment variables.
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*/
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static struct
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{
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const char *ev;
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int mask;
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} howto_names[] = {
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{"boot_askname", RB_ASKNAME},
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{"boot_cdrom", RB_CDROM},
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{"boot_userconfig", RB_CONFIG},
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{"boot_ddb", RB_KDB},
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{"boot_gdb", RB_GDB},
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{"boot_single", RB_SINGLE},
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{"boot_verbose", RB_VERBOSE},
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{"boot_multicons", RB_MULTIPLE},
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{"boot_serial", RB_SERIAL},
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{NULL, 0}
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};
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extern char *ski_fmtdev(void *vdev);
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extern int ski_init_stubs(struct bootinfo *);
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int
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bi_getboothowto(char *kargs)
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{
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char *cp;
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int howto;
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int active;
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int i;
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/* Parse kargs */
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howto = 0;
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if (kargs != NULL) {
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cp = kargs;
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active = 0;
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while (*cp != 0) {
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if (!active && (*cp == '-')) {
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active = 1;
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} else if (active)
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switch (*cp) {
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case 'a':
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howto |= RB_ASKNAME;
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break;
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case 'c':
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howto |= RB_CONFIG;
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break;
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case 'C':
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howto |= RB_CDROM;
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break;
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case 'd':
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howto |= RB_KDB;
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break;
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case 'm':
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howto |= RB_MUTE;
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break;
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case 'g':
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howto |= RB_GDB;
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break;
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case 'h':
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howto |= RB_SERIAL;
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break;
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case 'r':
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howto |= RB_DFLTROOT;
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break;
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case 's':
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howto |= RB_SINGLE;
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break;
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case 'v':
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howto |= RB_VERBOSE;
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break;
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default:
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active = 0;
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break;
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}
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cp++;
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}
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}
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/* get equivalents from the environment */
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for (i = 0; howto_names[i].ev != NULL; i++)
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if (getenv(howto_names[i].ev) != NULL)
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howto |= howto_names[i].mask;
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if (!strcmp(getenv("console"), "comconsole"))
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howto |= RB_SERIAL;
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if (!strcmp(getenv("console"), "nullconsole"))
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howto |= RB_MUTE;
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return(howto);
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}
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/*
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* Copy the environment into the load area starting at (addr).
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* Each variable is formatted as <name>=<value>, with a single nul
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* separating each variable, and a double nul terminating the environment.
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*/
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vm_offset_t
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bi_copyenv(vm_offset_t addr)
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{
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struct env_var *ep;
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/* traverse the environment */
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for (ep = environ; ep != NULL; ep = ep->ev_next) {
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ski_copyin(ep->ev_name, addr, strlen(ep->ev_name));
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addr += strlen(ep->ev_name);
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ski_copyin("=", addr, 1);
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addr++;
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if (ep->ev_value != NULL) {
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ski_copyin(ep->ev_value, addr, strlen(ep->ev_value));
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addr += strlen(ep->ev_value);
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}
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ski_copyin("", addr, 1);
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addr++;
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}
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ski_copyin("", addr, 1);
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addr++;
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return(addr);
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}
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/*
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* Copy module-related data into the load area, where it can be
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* used as a directory for loaded modules.
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*
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* Module data is presented in a self-describing format. Each datum
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* is preceded by a 32-bit identifier and a 32-bit size field.
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*
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* Currently, the following data are saved:
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*
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* MOD_NAME (variable) module name (string)
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* MOD_TYPE (variable) module type (string)
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* MOD_ARGS (variable) module parameters (string)
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* MOD_ADDR sizeof(vm_offset_t) module load address
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* MOD_SIZE sizeof(size_t) module size
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* MOD_METADATA (variable) type-specific metadata
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*/
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#define COPY32(v, a) { \
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u_int32_t x = (v); \
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ski_copyin(&x, a, sizeof(x)); \
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a += sizeof(x); \
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}
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#define MOD_STR(t, a, s) { \
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COPY32(t, a); \
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COPY32(strlen(s) + 1, a); \
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ski_copyin(s, a, strlen(s) + 1); \
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a += roundup(strlen(s) + 1, sizeof(u_int64_t));\
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}
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#define MOD_NAME(a, s) MOD_STR(MODINFO_NAME, a, s)
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#define MOD_TYPE(a, s) MOD_STR(MODINFO_TYPE, a, s)
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#define MOD_ARGS(a, s) MOD_STR(MODINFO_ARGS, a, s)
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#define MOD_VAR(t, a, s) { \
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COPY32(t, a); \
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COPY32(sizeof(s), a); \
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ski_copyin(&s, a, sizeof(s)); \
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a += roundup(sizeof(s), sizeof(u_int64_t)); \
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}
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#define MOD_ADDR(a, s) MOD_VAR(MODINFO_ADDR, a, s)
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#define MOD_SIZE(a, s) MOD_VAR(MODINFO_SIZE, a, s)
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#define MOD_METADATA(a, mm) { \
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COPY32(MODINFO_METADATA | mm->md_type, a); \
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COPY32(mm->md_size, a); \
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ski_copyin(mm->md_data, a, mm->md_size); \
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a += roundup(mm->md_size, sizeof(u_int64_t));\
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}
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#define MOD_END(a) { \
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COPY32(MODINFO_END, a); \
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COPY32(0, a); \
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}
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vm_offset_t
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bi_copymodules(vm_offset_t addr)
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{
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struct preloaded_file *fp;
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struct file_metadata *md;
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/* start with the first module on the list, should be the kernel */
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for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
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MOD_NAME(addr, fp->f_name); /* this field must come first */
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MOD_TYPE(addr, fp->f_type);
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if (fp->f_args)
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MOD_ARGS(addr, fp->f_args);
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MOD_ADDR(addr, fp->f_addr);
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MOD_SIZE(addr, fp->f_size);
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for (md = fp->f_metadata; md != NULL; md = md->md_next)
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if (!(md->md_type & MODINFOMD_NOCOPY))
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MOD_METADATA(addr, md);
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}
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MOD_END(addr);
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return(addr);
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}
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/*
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* Load the information expected by an alpha kernel.
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*
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* - The kernel environment is copied into kernel space.
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* - Module metadata are formatted and placed in kernel space.
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*/
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int
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bi_load(struct bootinfo *bi, struct preloaded_file *fp, char *args)
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{
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char *rootdevname;
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struct ski_devdesc *rootdev;
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struct preloaded_file *xp;
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vm_offset_t addr, bootinfo_addr;
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u_int pad;
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char *kernelname;
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vm_offset_t ssym, esym;
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struct file_metadata *md;
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/*
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* Version 1 bootinfo.
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*/
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bi->bi_magic = BOOTINFO_MAGIC;
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bi->bi_version = 1;
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/*
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* Calculate boothowto.
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*/
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bi->bi_boothowto = bi_getboothowto(fp->f_args);
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/*
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* Allow the environment variable 'rootdev' to override the supplied device
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* This should perhaps go to MI code and/or have $rootdev tested/set by
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* MI code before launching the kernel.
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*/
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rootdevname = getenv("rootdev");
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ski_getdev((void **)(&rootdev), rootdevname, NULL);
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if (rootdev == NULL) { /* bad $rootdev/$currdev */
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printf("can't determine root device\n");
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return(EINVAL);
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}
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/* Try reading the /etc/fstab file to select the root device */
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getrootmount(ski_fmtdev((void *)rootdev));
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free(rootdev);
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ssym = esym = 0;
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if ((md = file_findmetadata(fp, MODINFOMD_SSYM)) != NULL)
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ssym = *((vm_offset_t *)&(md->md_data));
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if ((md = file_findmetadata(fp, MODINFOMD_ESYM)) != NULL)
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esym = *((vm_offset_t *)&(md->md_data));
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if (ssym == 0 || esym == 0)
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ssym = esym = 0; /* sanity */
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bi->bi_symtab = ssym;
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bi->bi_esymtab = esym;
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/* find the last module in the chain */
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addr = 0;
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for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
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if (addr < (xp->f_addr + xp->f_size))
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addr = xp->f_addr + xp->f_size;
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}
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/* pad to a page boundary */
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pad = (u_int)addr & PAGE_MASK;
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if (pad != 0) {
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pad = PAGE_SIZE - pad;
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addr += pad;
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}
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/* copy our environment */
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bi->bi_envp = addr;
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addr = bi_copyenv(addr);
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/* pad to a page boundary */
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pad = (u_int)addr & PAGE_MASK;
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if (pad != 0) {
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pad = PAGE_SIZE - pad;
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addr += pad;
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}
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/* copy module list and metadata */
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bi->bi_modulep = addr;
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addr = bi_copymodules(addr);
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/* all done copying stuff in, save end of loaded object space */
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bi->bi_kernend = addr;
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return (ski_init_stubs(bi));
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}
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