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/*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <boot.h>
#include <common.h>
#include <command.h>
#include <driver.h>
#include <environment.h>
#include <image.h>
#include <zlib.h>
#include <init.h>
#include <fs.h>
#include <linux/list.h>
#include <xfuncs.h>
#include <malloc.h>
#include <fcntl.h>
#include <errno.h>
#include <memory.h>
#include <of.h>
#include <asm/byteorder.h>
#include <asm/setup.h>
#include <asm/barebox-arm.h>
#include <asm/armlinux.h>
#include <asm/system.h>
static struct tag *params;
static int armlinux_architecture = 0;
static void *armlinux_bootparams = NULL;
static unsigned int system_rev;
static u64 system_serial;
static void setup_start_tag(void)
{
params = (struct tag *)armlinux_bootparams;
params->hdr.tag = ATAG_CORE;
params->hdr.size = tag_size(tag_core);
params->u.core.flags = 0;
params->u.core.pagesize = 0;
params->u.core.rootdev = 0;
params = tag_next(params);
}
static void setup_memory_tags(void)
{
struct memory_bank *bank;
for_each_memory_bank(bank) {
params->hdr.tag = ATAG_MEM;
params->hdr.size = tag_size(tag_mem32);
params->u.mem.start = bank->start;
params->u.mem.size = bank->size;
params = tag_next(params);
}
}
static void setup_commandline_tag(const char *commandline, int swap)
{
const char *p;
size_t words;
if (!commandline)
return;
/* eat leading white space */
for (p = commandline; *p == ' '; p++) ;
/*
* skip non-existent command lines so the kernel will still
* use its default command line.
*/
if (*p == '\0')
return;
words = (strlen(p) + 1 /* NUL */ + 3 /* round up */) >> 2;
params->hdr.tag = ATAG_CMDLINE;
params->hdr.size = (sizeof(struct tag_header) >> 2) + words;
strcpy(params->u.cmdline.cmdline, p);
#ifdef CONFIG_BOOT_ENDIANNESS_SWITCH
if (swap) {
u32 *cmd = (u32 *)params->u.cmdline.cmdline;
while (words--)
cmd[words] = swab32(cmd[words]);
}
#endif
params = tag_next(params);
}
static void setup_revision_tag(void)
{
if (system_rev) {
params->hdr.tag = ATAG_REVISION;
params->hdr.size = tag_size(tag_revision);
params->u.revision.rev = system_rev;
params = tag_next(params);
}
}
static void setup_serial_tag(void)
{
if (system_serial) {
params->hdr.tag = ATAG_SERIAL;
params->hdr.size = tag_size(tag_serialnr);
params->u.serialnr.low = system_serial & 0xffffffff;
params->u.serialnr.high = system_serial >> 32;
params = tag_next(params);
}
}
static void setup_initrd_tag(image_header_t *header)
{
/* an ATAG_INITRD node tells the kernel where the compressed
* ramdisk can be found. ATAG_RDIMG is a better name, actually.
*/
params->hdr.tag = ATAG_INITRD2;
params->hdr.size = tag_size(tag_initrd);
params->u.initrd.start = image_get_load(header);
params->u.initrd.size = image_get_data_size(header);
params = tag_next(params);
}
static void setup_end_tag (void)
{
params->hdr.tag = ATAG_NONE;
params->hdr.size = 0;
}
static void setup_tags(struct image_data *data, int swap)
{
const char *commandline = getenv("bootargs");
setup_start_tag();
setup_memory_tags();
setup_commandline_tag(commandline, swap);
if (data && data->initrd)
setup_initrd_tag (&data->initrd->header);
setup_revision_tag();
setup_serial_tag();
setup_end_tag();
printf("commandline: %s\n"
"arch_number: %d\n", commandline, armlinux_architecture);
}
void armlinux_set_bootparams(void *params)
{
armlinux_bootparams = params;
}
void armlinux_set_architecture(int architecture)
{
char *arch_number = asprintf("%d", architecture);
armlinux_architecture = architecture;
setenv("arch_number", arch_number);
export("arch_number");
kfree(arch_number);
}
void armlinux_set_revision(unsigned int rev)
{
system_rev = rev;
}
void armlinux_set_serial(u64 serial)
{
system_serial = serial;
}
void start_linux(void *adr, int swap, struct image_data *data)
{
void (*kernel)(int zero, int arch, void *params) = adr;
void *params = NULL;
#ifdef CONFIG_OFTREE
params = of_get_fixed_tree();
if (params)
printf("booting Linux kernel with devicetree\n");
#endif
if (!params) {
setup_tags(data, swap);
params = armlinux_bootparams;
}
shutdown_barebox();
if (swap) {
u32 reg;
__asm__ __volatile__("mrc p15, 0, %0, c1, c0" : "=r" (reg));
reg ^= CR_B; /* swap big-endian flag */
__asm__ __volatile__("mcr p15, 0, %0, c1, c0" :: "r" (reg));
}
kernel(0, armlinux_architecture, params);
}
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