ARC: Boot #1: low-level, setup_arch(), /proc/cpuinfo, mem init
Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Vineet Gupta
parent
1162b0701b
commit
c121c5063c
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@ -23,7 +23,9 @@ config ARC
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select GENERIC_SIGALTSTACK
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select GENERIC_SMP_IDLE_THREAD
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select HAVE_GENERIC_HARDIRQS
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select HAVE_MEMBLOCK
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select MODULES_USE_ELF_RELA
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select NO_BOOTMEM
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config SCHED_OMIT_FRAME_POINTER
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def_bool y
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@ -258,6 +258,11 @@
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} \
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}
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/* Helpers */
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#define TO_KB(bytes) ((bytes) >> 10)
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#define TO_MB(bytes) (TO_KB(bytes) >> 10)
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#define PAGES_TO_KB(n_pages) ((n_pages) << (PAGE_SHIFT - 10))
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#define PAGES_TO_MB(n_pages) (PAGES_TO_KB(n_pages) >> 10)
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#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
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/* These DPFP regs need to be saved/restored across ctx-sw */
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@ -0,0 +1,22 @@
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASMARC_SETUP_H
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#define __ASMARC_SETUP_H
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#include <linux/types.h>
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#define COMMAND_LINE_SIZE 256
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extern int root_mountflags, end_mem;
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extern int running_on_hw;
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void __init setup_processor(void);
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void __init setup_arch_memory(void);
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#endif /* __ASMARC_SETUP_H */
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@ -0,0 +1,78 @@
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/*
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* ARC CPU startup Code
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*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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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 version 2 as
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* published by the Free Software Foundation.
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*
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* Vineetg: Dec 2007
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* -Check if we are running on Simulator or on real hardware
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* to skip certain things during boot on simulator
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*/
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#include <asm/asm-offsets.h>
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#include <asm/entry.h>
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#include <linux/linkage.h>
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#include <asm/arcregs.h>
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.cpu A7
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.section .init.text, "ax",@progbits
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.type stext, @function
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.globl stext
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stext:
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;-------------------------------------------------------------------
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; Don't clobber r0-r4 yet. It might have bootloader provided info
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;-------------------------------------------------------------------
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; Clear BSS before updating any globals
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; XXX: use ZOL here
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mov r5, __bss_start
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mov r6, __bss_stop
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1:
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st.ab 0, [r5,4]
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brlt r5, r6, 1b
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#ifdef CONFIG_CMDLINE_UBOOT
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; support for bootloader provided cmdline
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; If cmdline passed by u-boot, then
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; r0 = 1 (because ATAGS parsing, now retired, used to use 0)
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; r1 = magic number (board identity)
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; r2 = addr of cmdline string (somewhere in memory/flash)
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brne r0, 1, .Lother_bootup_chores ; u-boot didn't pass cmdline
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breq r2, 0, .Lother_bootup_chores ; or cmdline is NULL
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mov r5, @command_line
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1:
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ldb.ab r6, [r2, 1]
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breq r6, 0, .Lother_bootup_chores
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b.d 1b
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stb.ab r6, [r5, 1]
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#endif
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.Lother_bootup_chores:
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; Identify if running on ISS vs Silicon
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; IDENTITY Reg [ 3 2 1 0 ]
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; (chip-id) ^^^^^ ==> 0xffff for ISS
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lr r0, [identity]
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lsr r3, r0, 16
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cmp r3, 0xffff
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mov.z r4, 0
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mov.nz r4, 1
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st r4, [@running_on_hw]
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; setup "current" tsk and optionally cache it in dedicated r25
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mov r9, @init_task
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SET_CURR_TASK_ON_CPU r9, r0 ; r9 = tsk, r0 = scratch
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; setup stack (fp, sp)
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mov fp, 0
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; tsk->thread_info is really a PAGE, whose bottom hoists stack
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GET_TSK_STACK_BASE r9, sp ; r9 = tsk, sp = stack base(output)
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j start_kernel ; "C" entry point
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@ -0,0 +1,33 @@
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/*
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* Copyright (C) 2011-2012 Synopsys, Inc. (www.synopsys.com)
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/printk.h>
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#include <linux/reboot.h>
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#include <linux/pm.h>
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void machine_halt(void)
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{
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/* Halt the processor */
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__asm__ __volatile__("flag 1\n");
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}
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void machine_restart(char *__unused)
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{
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/* Soft reset : jump to reset vector */
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pr_info("Put your restart handler here\n");
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machine_halt();
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}
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void machine_power_off(void)
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{
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/* FIXME :: power off ??? */
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machine_halt();
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}
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void (*pm_power_off) (void) = NULL;
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@ -0,0 +1,166 @@
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/seq_file.h>
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#include <linux/fs.h>
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#include <linux/delay.h>
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#include <linux/root_dev.h>
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#include <linux/console.h>
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#include <linux/module.h>
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#include <linux/cpu.h>
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#include <asm/arcregs.h>
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#include <asm/tlb.h>
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#include <asm/cache.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/irq.h>
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#include <asm/arcregs.h>
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#define FIX_PTR(x) __asm__ __volatile__(";" : "+r"(x))
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int running_on_hw = 1; /* vs. on ISS */
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char __initdata command_line[COMMAND_LINE_SIZE];
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struct task_struct *_current_task[NR_CPUS]; /* For stack switching */
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struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
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void __init read_arc_build_cfg_regs(void)
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{
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read_decode_mmu_bcr();
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read_decode_cache_bcr();
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}
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/*
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* Initialize and setup the processor core
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* This is called by all the CPUs thus should not do special case stuff
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* such as only for boot CPU etc
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*/
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void __init setup_processor(void)
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{
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read_arc_build_cfg_regs();
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arc_init_IRQ();
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arc_mmu_init();
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arc_cache_init();
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}
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void __init __attribute__((weak)) arc_platform_early_init(void)
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{
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}
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void __init setup_arch(char **cmdline_p)
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{
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#ifdef CONFIG_CMDLINE_UBOOT
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/* Make sure that a whitespace is inserted before */
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strlcat(command_line, " ", sizeof(command_line));
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#endif
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/*
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* Append .config cmdline to base command line, which might already
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* contain u-boot "bootargs" (handled by head.S, if so configured)
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*/
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strlcat(command_line, CONFIG_CMDLINE, sizeof(command_line));
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/* Save unparsed command line copy for /proc/cmdline */
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strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
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*cmdline_p = command_line;
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/* To force early parsing of things like mem=xxx */
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parse_early_param();
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/* Platform/board specific: e.g. early console registration */
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arc_platform_early_init();
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setup_processor();
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setup_arch_memory();
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/* Can be issue if someone passes cmd line arg "ro"
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* But that is unlikely so keeping it as it is
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*/
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root_mountflags &= ~MS_RDONLY;
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console_verbose();
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#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
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conswitchp = &dummy_con;
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#endif
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}
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/*
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* Get CPU information for use by the procfs.
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*/
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#define cpu_to_ptr(c) ((void *)(0xFFFF0000 | (unsigned int)(c)))
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#define ptr_to_cpu(p) (~0xFFFF0000UL & (unsigned int)(p))
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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char *str;
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int cpu_id = ptr_to_cpu(v);
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str = (char *)__get_free_page(GFP_TEMPORARY);
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if (!str)
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goto done;
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seq_printf(m, "ARC700 #%d\n", cpu_id);
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seq_printf(m, "Bogo MIPS : \t%lu.%02lu\n",
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loops_per_jiffy / (500000 / HZ),
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(loops_per_jiffy / (5000 / HZ)) % 100);
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free_page((unsigned long)str);
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done:
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seq_printf(m, "\n\n");
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return 0;
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}
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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/*
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* Callback returns cpu-id to iterator for show routine, NULL to stop.
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* However since NULL is also a valid cpu-id (0), we use a round-about
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* way to pass it w/o having to kmalloc/free a 2 byte string.
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* Encode cpu-id as 0xFFcccc, which is decoded by show routine.
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*/
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return *pos < num_possible_cpus() ? cpu_to_ptr(*pos) : NULL;
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return c_start(m, pos);
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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}
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const struct seq_operations cpuinfo_op = {
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.start = c_start,
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.next = c_next,
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.stop = c_stop,
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.show = show_cpuinfo
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};
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static DEFINE_PER_CPU(struct cpu, cpu_topology);
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static int __init topology_init(void)
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{
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int cpu;
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for_each_present_cpu(cpu)
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register_cpu(&per_cpu(cpu_topology, cpu), cpu);
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return 0;
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}
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subsys_initcall(topology_init);
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@ -0,0 +1,171 @@
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/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/memblock.h>
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#ifdef CONFIG_BLOCK_DEV_RAM
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#include <linux/blk.h>
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#endif
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#include <linux/swap.h>
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#include <linux/module.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/sections.h>
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#include <asm/arcregs.h>
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
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char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
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EXPORT_SYMBOL(empty_zero_page);
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/* Default tot mem from .config */
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static unsigned long arc_mem_sz = CONFIG_ARC_PLAT_SDRAM_SIZE;
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/* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
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static int __init setup_mem_sz(char *str)
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{
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arc_mem_sz = memparse(str, NULL) & PAGE_MASK;
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/* early console might not be setup yet - it will show up later */
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pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(arc_mem_sz));
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return 0;
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}
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early_param("mem", setup_mem_sz);
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/*
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* First memory setup routine called from setup_arch()
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* 1. setup swapper's mm @init_mm
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* 2. Count the pages we have and setup bootmem allocator
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* 3. zone setup
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*/
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void __init setup_arch_memory(void)
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{
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unsigned long zones_size[MAX_NR_ZONES] = { 0, 0 };
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unsigned long end_mem = CONFIG_LINUX_LINK_BASE + arc_mem_sz;
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init_mm.start_code = (unsigned long)_text;
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init_mm.end_code = (unsigned long)_etext;
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init_mm.end_data = (unsigned long)_edata;
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init_mm.brk = (unsigned long)_end;
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/*
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* We do it here, so that memory is correctly instantiated
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* even if "mem=xxx" cmline over-ride is not given
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*/
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memblock_add(CONFIG_LINUX_LINK_BASE, arc_mem_sz);
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/*------------- externs in mm need setting up ---------------*/
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/* first page of system - kernel .vector starts here */
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min_low_pfn = PFN_DOWN(CONFIG_LINUX_LINK_BASE);
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/* Last usable page of low mem (no HIGHMEM yet for ARC port) */
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max_low_pfn = max_pfn = PFN_DOWN(end_mem);
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max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
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/*------------- reserve kernel image -----------------------*/
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memblock_reserve(CONFIG_LINUX_LINK_BASE,
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__pa(_end) - CONFIG_LINUX_LINK_BASE);
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memblock_dump_all();
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/*-------------- node setup --------------------------------*/
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memset(zones_size, 0, sizeof(zones_size));
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zones_size[ZONE_NORMAL] = num_physpages;
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/*
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* We can't use the helper free_area_init(zones[]) because it uses
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* PAGE_OFFSET to compute the @min_low_pfn which would be wrong
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* when our kernel doesn't start at PAGE_OFFSET, i.e.
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* PAGE_OFFSET != CONFIG_LINUX_LINK_BASE
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*/
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free_area_init_node(0, /* node-id */
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zones_size, /* num pages per zone */
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min_low_pfn, /* first pfn of node */
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NULL); /* NO holes */
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}
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/*
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* mem_init - initializes memory
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*
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* Frees up bootmem
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* Calculates and displays memory available/used
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*/
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void __init mem_init(void)
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{
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int codesize, datasize, initsize, reserved_pages, free_pages;
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int tmp;
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high_memory = (void *)(CONFIG_LINUX_LINK_BASE + arc_mem_sz);
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totalram_pages = free_all_bootmem();
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/* count all reserved pages [kernel code/data/mem_map..] */
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reserved_pages = 0;
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for (tmp = 0; tmp < max_mapnr; tmp++)
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if (PageReserved(mem_map + tmp))
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reserved_pages++;
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/* XXX: nr_free_pages() is equivalent */
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free_pages = max_mapnr - reserved_pages;
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/*
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* For the purpose of display below, split the "reserve mem"
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* kernel code/data is already shown explicitly,
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* Show any other reservations (mem_map[ ] et al)
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*/
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reserved_pages -= (((unsigned int)_end - CONFIG_LINUX_LINK_BASE) >>
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PAGE_SHIFT);
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codesize = _etext - _text;
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datasize = _end - _etext;
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initsize = __init_end - __init_begin;
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pr_info("Memory Available: %dM / %ldM (%dK code, %dK data, %dK init, %dK reserv)\n",
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PAGES_TO_MB(free_pages),
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TO_MB(arc_mem_sz),
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TO_KB(codesize), TO_KB(datasize), TO_KB(initsize),
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PAGES_TO_KB(reserved_pages));
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}
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static void __init free_init_pages(const char *what, unsigned long begin,
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unsigned long end)
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{
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unsigned long addr;
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pr_info("Freeing %s: %ldk [%lx] to [%lx]\n",
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what, TO_KB(end - begin), begin, end);
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/* need to check that the page we free is not a partial page */
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for (addr = begin; addr + PAGE_SIZE <= end; addr += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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free_page(addr);
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totalram_pages++;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* free_initmem: Free all the __init memory.
|
||||
*/
|
||||
void __init_refok free_initmem(void)
|
||||
{
|
||||
free_init_pages("unused kernel memory",
|
||||
(unsigned long)__init_begin,
|
||||
(unsigned long)__init_end);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_BLK_DEV_INITRD
|
||||
void __init free_initrd_mem(unsigned long start, unsigned long end)
|
||||
{
|
||||
free_init_pages("initrd memory", start, end);
|
||||
}
|
||||
#endif
|
||||
|
|
@ -0,0 +1,29 @@
|
|||
/*
|
||||
* ARC FPGA Platform support code
|
||||
*
|
||||
* Copyright (C) 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/types.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/platform_device.h>
|
||||
|
||||
/*
|
||||
* Early Platform Initialization called from setup_arch()
|
||||
*/
|
||||
void __init arc_platform_early_init(void)
|
||||
{
|
||||
pr_info("[plat-arcfpga]: registering early dev resources\n");
|
||||
}
|
||||
|
||||
int __init fpga_plat_init(void)
|
||||
{
|
||||
pr_info("[plat-arcfpga]: registering device resources\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
arch_initcall(fpga_plat_init);
|
||||
Loading…
Reference in New Issue