Start a 2nd stage barebox with the Linux Kernel calling convention. Right now barebox does not interpret ATAGs or devicetree passed to it, but it doesn't hurt to pass parameters so that future bareboxes can use them. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
294 lines
6.4 KiB
C
294 lines
6.4 KiB
C
/*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <boot.h>
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#include <common.h>
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#include <command.h>
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#include <driver.h>
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#include <environment.h>
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#include <image.h>
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#include <init.h>
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#include <fs.h>
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#include <linux/list.h>
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#include <xfuncs.h>
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#include <malloc.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <memory.h>
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#include <of.h>
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#include <magicvar.h>
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#include <asm/byteorder.h>
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#include <asm/setup.h>
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#include <asm/barebox-arm.h>
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#include <asm/armlinux.h>
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#include <asm/system.h>
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static struct tag *params;
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static void *armlinux_bootparams = NULL;
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static int armlinux_architecture;
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static u32 armlinux_system_rev;
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static u64 armlinux_system_serial;
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BAREBOX_MAGICVAR(armlinux_architecture, "ARM machine ID");
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BAREBOX_MAGICVAR(armlinux_system_rev, "ARM system revision");
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BAREBOX_MAGICVAR(armlinux_system_serial, "ARM system serial");
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void armlinux_set_architecture(int architecture)
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{
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export_env_ull("armlinux_architecture", architecture);
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armlinux_architecture = architecture;
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}
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int armlinux_get_architecture(void)
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{
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getenv_uint("armlinux_architecture", &armlinux_architecture);
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return armlinux_architecture;
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}
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void armlinux_set_revision(unsigned int rev)
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{
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export_env_ull("armlinux_system_rev", rev);
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armlinux_system_rev = rev;
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}
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unsigned int armlinux_get_revision(void)
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{
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getenv_uint("armlinux_system_rev", &armlinux_system_rev);
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return armlinux_system_rev;
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}
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void armlinux_set_serial(u64 serial)
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{
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export_env_ull("armlinux_system_serial", serial);
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armlinux_system_serial = serial;
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}
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u64 armlinux_get_serial(void)
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{
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getenv_ull("armlinux_system_serial", &armlinux_system_serial);
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return armlinux_system_serial;
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}
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void armlinux_set_bootparams(void *params)
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{
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armlinux_bootparams = params;
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}
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static struct tag *armlinux_get_bootparams(void)
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{
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struct memory_bank *mem;
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if (armlinux_bootparams)
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return armlinux_bootparams;
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for_each_memory_bank(mem)
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return (void *)mem->start + 0x100;
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BUG();
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}
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#ifdef CONFIG_ARM_BOARD_APPEND_ATAG
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static struct tag *(*atag_appender)(struct tag *);
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void armlinux_set_atag_appender(struct tag *(*func)(struct tag *))
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{
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atag_appender = func;
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}
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#endif
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static void setup_start_tag(void)
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{
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params = armlinux_get_bootparams();
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params->hdr.tag = ATAG_CORE;
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params->hdr.size = tag_size(tag_core);
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params->u.core.flags = 0;
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params->u.core.pagesize = 0;
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params->u.core.rootdev = 0;
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params = tag_next(params);
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}
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static void setup_memory_tags(void)
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{
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struct memory_bank *bank;
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for_each_memory_bank(bank) {
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params->hdr.tag = ATAG_MEM;
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params->hdr.size = tag_size(tag_mem32);
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params->u.mem.start = bank->start;
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params->u.mem.size = bank->size;
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params = tag_next(params);
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}
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}
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static void setup_commandline_tag(const char *commandline, int swap)
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{
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const char *p;
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size_t words;
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if (!commandline)
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return;
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/* eat leading white space */
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for (p = commandline; *p == ' '; p++) ;
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/*
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* skip non-existent command lines so the kernel will still
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* use its default command line.
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*/
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if (*p == '\0')
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return;
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words = (strlen(p) + 1 /* NUL */ + 3 /* round up */) >> 2;
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params->hdr.tag = ATAG_CMDLINE;
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params->hdr.size = (sizeof(struct tag_header) >> 2) + words;
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strcpy(params->u.cmdline.cmdline, p);
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#ifdef CONFIG_BOOT_ENDIANNESS_SWITCH
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if (swap) {
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u32 *cmd = (u32 *)params->u.cmdline.cmdline;
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while (words--)
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cmd[words] = swab32(cmd[words]);
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}
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#endif
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params = tag_next(params);
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}
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static void setup_revision_tag(void)
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{
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u32 system_rev = armlinux_get_revision();
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if (system_rev) {
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params->hdr.tag = ATAG_REVISION;
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params->hdr.size = tag_size(tag_revision);
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params->u.revision.rev = system_rev;
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params = tag_next(params);
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}
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}
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static void setup_serial_tag(void)
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{
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u64 system_serial = armlinux_get_serial();
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if (system_serial) {
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params->hdr.tag = ATAG_SERIAL;
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params->hdr.size = tag_size(tag_serialnr);
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params->u.serialnr.low = system_serial & 0xffffffff;
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params->u.serialnr.high = system_serial >> 32;
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params = tag_next(params);
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}
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}
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static void setup_initrd_tag(unsigned long start, unsigned long size)
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{
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/* an ATAG_INITRD node tells the kernel where the compressed
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* ramdisk can be found. ATAG_RDIMG is a better name, actually.
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*/
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params->hdr.tag = ATAG_INITRD2;
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params->hdr.size = tag_size(tag_initrd);
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params->u.initrd.start = start;
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params->u.initrd.size = size;
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params = tag_next(params);
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}
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static void setup_end_tag (void)
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{
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params->hdr.tag = ATAG_NONE;
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params->hdr.size = 0;
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}
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static void setup_tags(unsigned long initrd_address,
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unsigned long initrd_size, int swap)
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{
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const char *commandline = linux_bootargs_get();
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setup_start_tag();
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setup_memory_tags();
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setup_commandline_tag(commandline, swap);
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if (initrd_size)
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setup_initrd_tag(initrd_address, initrd_size);
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setup_revision_tag();
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setup_serial_tag();
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#ifdef CONFIG_ARM_BOARD_APPEND_ATAG
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if (atag_appender != NULL)
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params = atag_appender(params);
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#endif
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setup_end_tag();
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printf("commandline: %s\n"
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"arch_number: %d\n", commandline, armlinux_get_architecture());
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}
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void start_linux(void *adr, int swap, unsigned long initrd_address,
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unsigned long initrd_size, void *oftree)
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{
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void (*kernel)(int zero, int arch, void *params) = adr;
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void *params = NULL;
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int architecture;
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if (oftree) {
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printf("booting kernel with devicetree\n");
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params = oftree;
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} else {
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setup_tags(initrd_address, initrd_size, swap);
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params = armlinux_get_bootparams();
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}
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architecture = armlinux_get_architecture();
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shutdown_barebox();
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if (swap) {
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u32 reg;
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__asm__ __volatile__("mrc p15, 0, %0, c1, c0" : "=r" (reg));
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reg ^= CR_B; /* swap big-endian flag */
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__asm__ __volatile__("mcr p15, 0, %0, c1, c0" :: "r" (reg));
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}
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#ifdef CONFIG_THUMB2_BAREBOX
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__asm__ __volatile__ (
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"mov r0, #0\n"
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"mov r1, %0\n"
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"mov r2, %1\n"
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"bx %2\n"
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:
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: "r" (architecture), "r" (params), "r" (kernel)
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: "r0", "r1", "r2"
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);
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#else
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kernel(0, architecture, params);
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#endif
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}
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