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//==========================================================================
//
// redboot_linux_exec.c
//
// RedBoot command to boot Linux
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later
// version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//####OTHERCOPYRIGHTBEGIN####
//
// The structure definitions below are taken from include/asm-/redboot.h in
// the Linux kernel, Copyright (c) 2002, 2003 Gary Thomas, Copyright (c) 1997 Dan Malek.
// Their presence here is for the express purpose of communication with the Linux
// kernel being booted and is considered 'fair use' by the original author and
// are included with their permission.
//
//####OTHERCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): msalter
// Contributors: gthomas,msalter
// Date: 2002-01-14
// Purpose:
// Description:
//
// This code is part of RedBoot (tm).
//
//####DESCRIPTIONEND####
//
//==========================================================================
#include <redboot.h>
#include <cyg/hal/hal_arch.h>
#include <cyg/hal/hal_if.h>
#include <cyg/hal/hal_intr.h>
#include <cyg/hal/hal_cache.h>
#ifdef CYGPKG_REDBOOT_NETWORKING
#include <net/net.h>
#endif
#ifdef CYGPKG_IO_ETH_DRIVERS
#include <cyg/io/eth/eth_drv.h> // Logical driver interfaces
#endif
#include CYGHWR_MEMORY_LAYOUT_H
#include <cyg/hal/redboot_linux_exec.h>
//=========================================================================
// Exported CLI function(s)
static void do_exec(int argc, char *argv[]);
RedBoot_cmd("exec",
"Execute a Linux image - with MMU off",
"[-w timeout]\n"
" [-c \"kernel command line\"] [<entry_point>]",
do_exec
);
//
// Execute a Linux kernel - this is a RedBoot CLI command
//
static void
do_exec(int argc, char *argv[])
{
unsigned long entry;
bool wait_time_set, cmd_line_set;
int wait_time;
char *cmd_line;
char *cline;
struct option_info opts[2];
hal_virtual_comm_table_t *__chan;
int baud_rate;
bd_t *board_info;
CYG_INTERRUPT_STATE oldints;
unsigned long sp = CYGMEM_REGION_ram+CYGMEM_REGION_ram_SIZE;
init_opts(&opts[0], 'w', true, OPTION_ARG_TYPE_NUM,
(void *)&wait_time, (bool *)&wait_time_set, "wait timeout");
init_opts(&opts[1], 'c', true, OPTION_ARG_TYPE_STR,
(void *)&cmd_line, (bool *)&cmd_line_set, "kernel command line");
entry = entry_address; // Default from last 'load' operation
if (!scan_opts(argc, argv, 1, opts, 2, (void *)&entry, OPTION_ARG_TYPE_NUM,
"[physical] starting address")) {
return;
}
if (entry == (unsigned long)NO_MEMORY) {
diag_printf("Can't execute Linux - invalid entry address\n");
return;
}
// Determine baud rate on current console
__chan = CYGACC_CALL_IF_CONSOLE_PROCS();
baud_rate = CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_GETBAUD);
if (baud_rate <= 0) {
baud_rate = CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL_BAUD;
}
// Make a little space at the top of the stack, and align to
// 64-bit boundary.
sp = (sp-128) & ~7; // The Linux boot code uses this space for FIFOs
// Copy the commandline onto the stack, and set the SP to just below it.
if (cmd_line_set) {
int len,i;
// get length of string
for( len = 0; cmd_line[len] != '\0'; len++ );
// decrement sp by length of string and align to
// word boundary.
sp = (sp-(len+1)) & ~3;
// assign this SP value to command line start
cline = (char *)sp;
// copy command line over.
for( i = 0; i < len; i++ )
cline[i] = cmd_line[i];
cline[len] = '\0';
} else {
cline = (char *)NULL;
}
// Set up parameter struct at top of stack
sp = sp-sizeof(bd_t);
board_info = (bd_t *)sp;
memset(board_info, sizeof(*board_info), 0);
board_info->bi_tag = 0x42444944;
board_info->bi_size = sizeof(*board_info);
board_info->bi_revision = 1;
board_info->bi_bdate = 0x06012002;
board_info->bi_memstart = CYGMEM_REGION_ram;
board_info->bi_memsize = CYGMEM_REGION_ram_SIZE;
board_info->bi_baudrate = baud_rate;
board_info->bi_cmdline = cline;
#ifdef CYGPKG_REDBOOT_NETWORKING
memcpy(board_info->bi_enetaddr, __local_enet_addr, sizeof(enet_addr_t));
#endif
// Call platform specific code to fill in the platform/architecture specific details
plf_redboot_linux_exec(board_info);
// adjust SP to 64 byte boundary, and leave a little space
// between it and the commandline for PowerPC calling
// conventions.
sp = (sp-64)&~63;
if (wait_time_set) {
int script_timeout_ms = wait_time * 1000;
#ifdef CYGFUN_REDBOOT_BOOT_SCRIPT
unsigned char *hold_script = script;
script = (unsigned char *)0;
#endif
diag_printf("About to start execution at %p - abort with ^C within %d seconds\n",
(void *)entry, wait_time);
while (script_timeout_ms >= CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT) {
int res;
char line[80];
res = _rb_gets(line, sizeof(line), CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT);
if (res == _GETS_CTRLC) {
#ifdef CYGFUN_REDBOOT_BOOT_SCRIPT
script = hold_script; // Re-enable script
#endif
return;
}
script_timeout_ms -= CYGNUM_REDBOOT_CLI_IDLE_TIMEOUT;
}
}
#ifdef CYGPKG_IO_ETH_DRIVERS
eth_drv_stop();
#endif
// Disable interrupts
HAL_DISABLE_INTERRUPTS(oldints);
// Put the caches to sleep.
HAL_DCACHE_SYNC();
HAL_ICACHE_DISABLE();
HAL_DCACHE_DISABLE();
HAL_DCACHE_SYNC();
HAL_ICACHE_INVALIDATE_ALL();
HAL_DCACHE_INVALIDATE_ALL();
// diag_printf("entry %08x, sp %08x, info %08x, cmd line %08x, baud %d\n",
// entry, sp, board_info, cline, baud_rate);
// breakpoint();
// Call into Linux
__asm__ volatile (
// Start by disabling MMU - the mappings are
// 1-1 so this should not cause any problems
"mfmsr 3\n"
"li 4,0xFFFFFFCF\n"
"and 3,3,4\n"
"sync\n"
"mtmsr 3\n"
"sync\n"
// Now set up parameters to jump into linux
"mtlr %0\n" // set entry address in LR
"mr 1,%1\n" // set stack pointer
"mr 3,%2\n" // set board info in R3
"mr 4,%3\n" // set command line in R4
"blr \n" // jump into linux
:
: "r"(entry),"r"(sp),"r"(board_info),"r"(cline)
: "r3", "r4"
);
}
//=========================================================================
// EOF redboot_linux_exec.c
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