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//=============================================================================
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//
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// redboot_linux_exec.c
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//
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// Boot linux from RedBoot
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//
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//=============================================================================
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// ####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 2005 Free Software Foundation, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later
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// version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with eCos; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// As a special exception, if other files instantiate templates or use
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// macros or inline functions from this file, or you compile this file
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// and link it with other works to produce a work based on this file,
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// this file does not by itself cause the resulting work to be covered by
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// the GNU General Public License. However the source code for this file
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// must still be made available in accordance with section (3) of the GNU
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// General Public License v2.
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//
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// This exception does not invalidate any other reasons why a work based
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// on this file might be covered by the GNU General Public License.
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// -------------------------------------------
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// ####ECOSGPLCOPYRIGHTEND####
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//=============================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): Ian Campbell
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// Contributors:
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// Date: 29 Oct 2004
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// Purpose: Boot Linux from Redboot
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// Description:
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//
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//####DESCRIPTIONEND####
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//
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//=============================================================================
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#include <pkgconf/hal.h>
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#include <redboot.h>
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#ifdef CYGPKG_IO_PCI
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#include <cyg/io/pci.h>
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#endif
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#ifdef CYGPKG_IO_ETH_DRIVERS
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#include <cyg/io/eth/eth_drv.h>
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#endif
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#include <cyg/hal/hal_intr.h>
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#include <cyg/hal/hal_cache.h>
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#include CYGHWR_MEMORY_LAYOUT_H
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#include <cyg/hal/hal_io.h>
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/*
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* Code to launch a Linux image directly in protected mode.
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*
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* Jumps directly to the protected mode part of the kernel
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*/
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typedef void (*trampoline_func)
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(unsigned long base, unsigned long length, unsigned long entry);
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// Defines for the linux loader
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#define SETUP_SIZE_OFF 497
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#define SECTSIZE 512
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#define SETUP_VERSION 0x0201
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#define SETUP_HIGH 0x01
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#define BIG_SYSSEG 0x10000
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#define DEF_BOOTLSEG 0x9020
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// From etherboot, this is the header to the image startup code
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// see Documentation/i386/boot.txt
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/* Boot sector: bootsect.S */
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/* VERSION: ALL */
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struct bootsect_header {
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cyg_uint8 pad0[0x1f1];
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cyg_uint8 setup_sects;
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cyg_uint16 root_flags; // If set, the root is mounted readonly
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cyg_uint16 syssize; // DO NOT USE - for bootsect.S use only
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cyg_uint16 swap_dev; // DO NOT USE - obsolete
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cyg_uint16 ram_size; // DO NOT USE - for bootsect.S use only
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cyg_uint16 vid_mode; // Video mode control
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cyg_uint16 root_dev; // Default root device number
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cyg_uint16 boot_flag; // 0xAA55 magic number
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} __attribute__((packed));
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/* setup.S */
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/* VERSION: 2.00+ */
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struct setup_header {
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cyg_uint8 jump[2];
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cyg_uint8 magic[4]; // "HdrS"
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cyg_uint16 version; // >= 0x0201 for initrd
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cyg_uint8 realmode_swtch[4];
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cyg_uint16 start_sys_seg;
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cyg_uint16 kernel_version;
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/* note: above part of header is compatible with loadlin-1.5
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* (header v1.5), must not change it */
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cyg_uint8 type_of_loader;
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cyg_uint8 loadflags;
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cyg_uint16 setup_move_size;
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unsigned long code32_start;
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unsigned long ramdisk_image;
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unsigned long ramdisk_size;
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unsigned long bootsect_kludge;
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/* VERSION: 2.01+ */
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cyg_uint16 heap_end_ptr;
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cyg_uint16 pad1;
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/* VERSION: 2.02+ */
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unsigned long cmd_line_ptr;
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/* VERSION: 2.03+ */
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unsigned long initrd_addr_max;
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} __attribute__((packed));
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#define PARAM 0x90000
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#define PARAM_ORIG_X *(cyg_uint8*) (PARAM+0x000)
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#define PARAM_ORIG_Y *(cyg_uint8*) (PARAM+0x001)
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#define PARAM_EXT_MEM_K *(cyg_uint16*)(PARAM+0x002)
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#define PARAM_ORIG_VIDEO_PAGE *(cyg_uint16*)(PARAM+0x004)
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#define PARAM_ORIG_VIDEO_MODE *(cyg_uint8*) (PARAM+0x006)
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#define PARAM_ORIG_VIDEO_COLS *(cyg_uint8*) (PARAM+0x007)
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#define PARAM_ORIG_VIDEO_EGA_BX *(cyg_uint16*)(PARAM+0x00a)
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#define PARAM_ORIG_VIDEO_LINES *(cyg_uint8*) (PARAM+0x00E)
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#define PARAM_ORIG_VIDEO_ISVGA *(cyg_uint8*) (PARAM+0x00F)
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#define PARAM_ORIG_VIDEO_POINTS *(cyg_uint16*)(PARAM+0x010)
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#define PARAM_ALT_MEM_K *(cyg_uint32*)(PARAM+0x1e0)
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#define PARAM_E820NR *(cyg_uint8*) (PARAM+0x1e8)
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#define PARAM_VID_MODE *(cyg_uint16*)(PARAM+0x1fa)
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#define PARAM_E820MAP (struct e820entry*)(PARAM+0x2d0);
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#define PARAM_CMDLINE (char *)(PARAM+0x3400)
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void
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do_exec(int argc, char **argv)
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{
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unsigned long entry;
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unsigned long oldints;
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bool wait_time_set;
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int wait_time, res;
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bool base_addr_set, length_set, cmd_line_set;
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bool ramdisk_addr_set, ramdisk_size_set;
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unsigned long base_addr, length;
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unsigned long ramdisk_addr, ramdisk_size;
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struct option_info opts[6];
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char *cmd_line;
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char line[8];
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cyg_uint32 mem_size;
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cyg_uint32 int15_e801;
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extern char __tramp_start__[], __tramp_end__[];
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trampoline_func trampoline =
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(trampoline_func)CYGHWR_REDBOOT_I386_TRAMPOLINE_ADDRESS;
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struct bootsect_header *bs_header;
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struct setup_header *s_header;
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int setup_sects;
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int xpos = 0, ypos = 0;
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base_addr = load_address;
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length = load_address_end - load_address;
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// Round length up to the next quad word
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length = (length + 3) & ~0x3;
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ramdisk_size = 4096*1024;
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init_opts(&opts[0], 'w', true, OPTION_ARG_TYPE_NUM,
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&wait_time, &wait_time_set, "wait timeout");
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init_opts(&opts[1], 'b', true, OPTION_ARG_TYPE_NUM,
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&base_addr, &base_addr_set, "base address");
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init_opts(&opts[2], 'l', true, OPTION_ARG_TYPE_NUM,
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&length, &length_set, "length");
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init_opts(&opts[3], 'c', true, OPTION_ARG_TYPE_STR,
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&cmd_line, &cmd_line_set, "kernel command line");
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init_opts(&opts[4], 'r', true, OPTION_ARG_TYPE_NUM,
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&ramdisk_addr, &ramdisk_addr_set, "ramdisk_addr");
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init_opts(&opts[5], 's', true, OPTION_ARG_TYPE_NUM,
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&ramdisk_size, &ramdisk_size_set, "ramdisk_size");
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if (!scan_opts(argc, argv, 1, opts, 6, 0, 0, "starting address"))
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{
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return;
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}
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if (wait_time_set) {
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int script_timeout_ms = wait_time * 1000;
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#ifdef CYGFUN_REDBOOT_BOOT_SCRIPT
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unsigned char *hold_script = script;
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script = (unsigned char *)0;
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#endif
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diag_printf("About to boot linux kernel at %p - "
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"abort with ^C within %d seconds\n",
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(void *)base_addr, wait_time);
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while (script_timeout_ms >= CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT) {
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res = _rb_gets(line, sizeof(line),
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CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT);
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if (res == _GETS_CTRLC) {
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#ifdef CYGFUN_REDBOOT_BOOT_SCRIPT
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script = hold_script; // Re-enable script
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#endif
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return;
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}
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script_timeout_ms -= CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT;
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}
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}
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if (base_addr_set && !length_set) {
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diag_printf("Length required for non-standard base address\n");
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return;
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}
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bs_header = (struct bootsect_header *)base_addr;
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s_header = (struct setup_header *)(base_addr + SECTSIZE);
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if (bs_header->boot_flag != 0xAA55) {
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diag_printf("Bootsector magic not found (0x%04x @ %4p)\n",
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bs_header->boot_flag, &bs_header->boot_flag);
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return;
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}
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if (memcmp(s_header->magic,"HdrS",4) != 0) {
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diag_printf("Linux header (HdrS) not found\n");
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return;
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}
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if (s_header->version < SETUP_VERSION) {
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diag_printf("Linux header version = 0x%04x. "
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"Needs to be at least 0x%04x\n",
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s_header->version, SETUP_VERSION);
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return;
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}
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setup_sects = bs_header->setup_sects ? bs_header->setup_sects : 4;
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entry = s_header->code32_start;
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// + 1 for boot sector
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base_addr += (setup_sects + 1 ) * SECTSIZE;
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length -= (setup_sects + 1 ) * SECTSIZE;
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mem_size = (cyg_uint32)HAL_MEM_REAL_REGION_TOP((cyg_uint8 *)0x1000000);
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mem_size >>= 10; // convert from bytes to kilobytes.
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// Result of int15 ax=0xe801
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int15_e801 = mem_size - 1024 ; // 1M+ only
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// Stop all network devices
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#ifdef CYGPKG_IO_ETH_DRIVERS
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eth_drv_stop();
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#endif
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#ifdef CYGPKG_IO_PCI
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cyg_pci_init();
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#endif
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#if CYGINT_HAL_I386_PCMB_SCREEN_SUPPORT > 0
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cyg_hal_plf_screen_position(&xpos, &ypos);
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#endif
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HAL_DISABLE_INTERRUPTS(oldints);
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HAL_DCACHE_SYNC();
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HAL_ICACHE_DISABLE();
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HAL_DCACHE_DISABLE();
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HAL_DCACHE_SYNC();
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HAL_ICACHE_INVALIDATE_ALL();
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HAL_DCACHE_INVALIDATE_ALL();
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// Clear the data area
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memset ( (void*)PARAM, 0, 512 );
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if ( cmd_line_set )
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strcpy( PARAM_CMDLINE, cmd_line );
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else
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strcpy( PARAM_CMDLINE, "auto");
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memcpy((void*)(PARAM+SECTSIZE), s_header, sizeof(struct setup_header));
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s_header = (struct setup_header*)(0x90000+SECTSIZE);
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s_header->version = SETUP_VERSION;
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// Command Line
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s_header->cmd_line_ptr = 0x93400;
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288 |
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// Loader type
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s_header->type_of_loader = 0xFF;
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// Fill in the interesting bits of data area...
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// ... Memory sizes
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PARAM_EXT_MEM_K = int15_e801;
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PARAM_ALT_MEM_K = int15_e801;
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296 |
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297 |
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// ... No e820 map!
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PARAM_E820NR = 0; // Length of map
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299 |
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300 |
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// ... Video stuff
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PARAM_ORIG_X = xpos;
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PARAM_ORIG_Y = ypos;
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PARAM_ORIG_VIDEO_MODE = 2;
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PARAM_ORIG_VIDEO_COLS = 80;
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PARAM_ORIG_VIDEO_LINES = 25;
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PARAM_ORIG_VIDEO_ISVGA = 0;
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// Copy trampoline to trampoline address
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309 |
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memcpy((char *)CYGHWR_REDBOOT_I386_TRAMPOLINE_ADDRESS,
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__tramp_start__,
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__tramp_end__ - __tramp_start__);
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312 |
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313 |
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trampoline(base_addr, length, entry);
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314 |
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315 |
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#define _QUOTE_STRING(__x__) #__x__
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316 |
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#define QUOTE_STRING(__x__) _QUOTE_STRING(__x__)
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317 |
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asm volatile (
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"__tramp_start__:\n"
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" push %%ebp;\n"
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321 |
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" mov %%esp,%%ebp;\n"
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322 |
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/* STACK IS:
|
324 |
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* OLD BP 0x4(%ebp)
|
325 |
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* ENTRY 0x8(%ebp)
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326 |
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* LENGTH 0xC(%ebp)
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327 |
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* BASE ADDRESS 0x10(%ebp) */
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328 |
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329 |
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" movl 0x10(%%ebp), %%ebx;\n" /* Save entry point
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330 |
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in EBX, because
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331 |
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we overwrite the
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332 |
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stack */
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333 |
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334 |
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" cli;\n" /* no interrupts allowed ! */
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335 |
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|
|
336 |
|
|
" movb $0x80, %%al;\n" /* disable NMI for bootup */
|
337 |
|
|
" outb %%al, $0x70;\n" /* sequence */
|
338 |
|
|
|
339 |
|
|
/* Copy GDT to RAM at 0x90400 */
|
340 |
|
|
" movl $(linux_gdt_end - linux_gdt), %%ecx;\n" /* Length */
|
341 |
|
|
" shrl $2, %%ecx;\n" /* Bytes -> Longs */
|
342 |
|
|
" leal linux_gdt, %%eax;\n" /* Source */
|
343 |
|
|
" movl %%eax, %%esi;\n"
|
344 |
|
|
" movl $(0x90400), %%edi;\n" /* Dest */
|
345 |
|
|
"1:\n"
|
346 |
|
|
" lodsl;\n"
|
347 |
|
|
" stosl;\n"
|
348 |
|
|
" loop 1b;\n"
|
349 |
|
|
|
350 |
|
|
/* If necessary, copy linux image to correct location */
|
351 |
|
|
" movl 0x8(%%ebp), %%esi;\n" /* Source */
|
352 |
|
|
" movl %%ebx, %%edi;\n" /* Destination
|
353 |
|
|
* (saved in
|
354 |
|
|
* EBX
|
355 |
|
|
* above) */
|
356 |
|
|
" cmpl %%edi, %%esi;\n"
|
357 |
|
|
" je 2f;\n"
|
358 |
|
|
" movl 0xC(%%ebp), %%ecx;\n" /* Length */
|
359 |
|
|
" shrl $2, %%ecx;\n" /* Bytes to Longs */
|
360 |
|
|
"1:\n"
|
361 |
|
|
" lodsl;\n"
|
362 |
|
|
" stosl;\n"
|
363 |
|
|
" loop 1b;\n"
|
364 |
|
|
"2:\n"
|
365 |
|
|
|
366 |
|
|
/* Create a GDT descriptor at 0 and load it */
|
367 |
|
|
" movl $0x90000, %%esi;\n"
|
368 |
|
|
" movw $(linux_gdt_end - linux_gdt), %%ax;\n"
|
369 |
|
|
" dec %%ax;\n"
|
370 |
|
|
" movw %%ax,0;\n"
|
371 |
|
|
" movl $0x90400,%%eax;\n"
|
372 |
|
|
" movl %%eax,2;\n"
|
373 |
|
|
" lgdt 0;\n"
|
374 |
|
|
|
375 |
|
|
/* Reload segment registers */
|
376 |
|
|
" mov $(0x18), %%eax;\n"
|
377 |
|
|
" movl %%eax, %%ds;\n"
|
378 |
|
|
" movl %%eax, %%es;\n"
|
379 |
|
|
" movl %%eax, %%fs;\n"
|
380 |
|
|
" movl %%eax, %%gs;\n"
|
381 |
|
|
|
382 |
|
|
/* Reload CS */
|
383 |
|
|
" ljmp $(0x10), $(1f - __tramp_start__ + "
|
384 |
|
|
QUOTE_STRING(CYGHWR_REDBOOT_I386_TRAMPOLINE_ADDRESS) ");\n"
|
385 |
|
|
"1:\n"
|
386 |
|
|
|
387 |
|
|
/* Start kernel */
|
388 |
|
|
" jmp *%%ebx;\n"
|
389 |
|
|
|
390 |
|
|
".ALIGN 4, 0xCC;\n"
|
391 |
|
|
|
392 |
|
|
"__tramp_end__:\n"
|
393 |
|
|
|
394 |
|
|
/* Descriptor tables */
|
395 |
|
|
"linux_gdt:\n"
|
396 |
|
|
" .word 0, 0, 0, 0;\n" /* dummy */
|
397 |
|
|
" .word 0, 0, 0, 0;\n" /* unused */
|
398 |
|
|
" .word 0xFFFF;\n" /* 4Gb - (0x100000*0x1000
|
399 |
|
|
* = * 4Gb) */
|
400 |
|
|
" .word 0;\n" /* base address = 0 */
|
401 |
|
|
" .word 0x9A00;\n" /* code read/exec */
|
402 |
|
|
" .word 0x00CF;\n" /* granularity = 4096, 386 */
|
403 |
|
|
/* (+5th nibble of limit) */
|
404 |
|
|
" .word 0xFFFF;\n" /* 4Gb - (0x100000*0x1000 = 4Gb) */
|
405 |
|
|
" .word 0;\n" /* base address = 0 */
|
406 |
|
|
" .word 0x9200;\n" /* data read/write */
|
407 |
|
|
" .word 0x00CF;\n" /* granularity = 4096, 386 */
|
408 |
|
|
/* (+5th nibble of limit) */
|
409 |
|
|
"linux_gdt_end:\n"
|
410 |
|
|
: : : "eax", "ebx", "ecx");
|
411 |
|
|
}
|
412 |
|
|
|
413 |
|
|
RedBoot_cmd("exec",
|
414 |
|
|
"Execute a Linux image",
|
415 |
|
|
"[-w timeout] [-b <base address> [-l <image length>]]\n"
|
416 |
|
|
" [-r <ramdisk addr> [-s <ramdisk length>]]\n"
|
417 |
|
|
" [-c \"kernel command line\"]",
|
418 |
|
|
do_exec
|
419 |
|
|
);
|