ARC: Boot #1: low-level, setup_arch(), /proc/cpuinfo, mem init (c121c506) · Commits · e / devices / android_kernel_fairphone_FP4

arch/arc/Kconfig

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		@@ -23,7 +23,9 @@ config ARC
		select GENERIC_SIGALTSTACK
		select GENERIC_SMP_IDLE_THREAD
		select HAVE_GENERIC_HARDIRQS
		select HAVE_MEMBLOCK
		select MODULES_USE_ELF_RELA
		select NO_BOOTMEM

		config SCHED_OMIT_FRAME_POINTER
		def_bool y

arch/arc/include/asm/arcregs.h

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		@@ -258,6 +258,11 @@
		} \
		}

		/* Helpers */
		#define TO_KB(bytes) ((bytes) >> 10)
		#define TO_MB(bytes) (TO_KB(bytes) >> 10)
		#define PAGES_TO_KB(n_pages) ((n_pages) << (PAGE_SHIFT - 10))
		#define PAGES_TO_MB(n_pages) (PAGES_TO_KB(n_pages) >> 10)

		#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
		/* These DPFP regs need to be saved/restored across ctx-sw */

arch/arc/include/asm/setup.h

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		/*
		* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*/

		#ifndef __ASMARC_SETUP_H
		#define __ASMARC_SETUP_H

		#include <linux/types.h>

		#define COMMAND_LINE_SIZE 256

		extern int root_mountflags, end_mem;
		extern int running_on_hw;

		void __init setup_processor(void);
		void __init setup_arch_memory(void);

		#endif /* __ASMARC_SETUP_H */

arch/arc/kernel/head.S

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		/*
		* ARC CPU startup Code
		*
		* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		* Vineetg: Dec 2007
		* -Check if we are running on Simulator or on real hardware
		* to skip certain things during boot on simulator
		*/

		#include <asm/asm-offsets.h>
		#include <asm/entry.h>
		#include <linux/linkage.h>
		#include <asm/arcregs.h>

		.cpu A7

		.section .init.text, "ax",@progbits
		.type stext, @function
		.globl stext
		stext:
		;-------------------------------------------------------------------
		; Don't clobber r0-r4 yet. It might have bootloader provided info
		;-------------------------------------------------------------------

		; Clear BSS before updating any globals
		; XXX: use ZOL here
		mov r5, __bss_start
		mov r6, __bss_stop
		1:
		st.ab 0, [r5,4]
		brlt r5, r6, 1b

		#ifdef CONFIG_CMDLINE_UBOOT
		; support for bootloader provided cmdline
		; If cmdline passed by u-boot, then
		; r0 = 1 (because ATAGS parsing, now retired, used to use 0)
		; r1 = magic number (board identity)
		; r2 = addr of cmdline string (somewhere in memory/flash)

		brne r0, 1, .Lother_bootup_chores ; u-boot didn't pass cmdline
		breq r2, 0, .Lother_bootup_chores ; or cmdline is NULL

		mov r5, @command_line
		1:
		ldb.ab r6, [r2, 1]
		breq r6, 0, .Lother_bootup_chores
		b.d 1b
		stb.ab r6, [r5, 1]
		#endif

		.Lother_bootup_chores:

		; Identify if running on ISS vs Silicon
		; IDENTITY Reg [ 3 2 1 0 ]
		; (chip-id) ^^^^^ ==> 0xffff for ISS
		lr r0, [identity]
		lsr r3, r0, 16
		cmp r3, 0xffff
		mov.z r4, 0
		mov.nz r4, 1
		st r4, [@running_on_hw]

		; setup "current" tsk and optionally cache it in dedicated r25
		mov r9, @init_task
		SET_CURR_TASK_ON_CPU r9, r0 ; r9 = tsk, r0 = scratch

		; setup stack (fp, sp)
		mov fp, 0

		; tsk->thread_info is really a PAGE, whose bottom hoists stack
		GET_TSK_STACK_BASE r9, sp ; r9 = tsk, sp = stack base(output)

		j start_kernel ; "C" entry point

arch/arc/kernel/reset.c

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		/*
		* Copyright (C) 2011-2012 Synopsys, Inc. (www.synopsys.com)
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*/

		#include <linux/kernel.h>
		#include <linux/printk.h>
		#include <linux/reboot.h>
		#include <linux/pm.h>

		void machine_halt(void)
		{
		/* Halt the processor */
		__asm__ __volatile__("flag 1\n");
		}

		void machine_restart(char *__unused)
		{
		/* Soft reset : jump to reset vector */
		pr_info("Put your restart handler here\n");
		machine_halt();
		}

		void machine_power_off(void)
		{
		/* FIXME :: power off ??? */
		machine_halt();
		}

		void (*pm_power_off) (void) = NULL;