7ddc839977
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings. In any case, they are temporary and harmless.
This removes all the arch/hexagon uses of the __cpuinit macros from
all C files. Currently hexagon does not have any __CPUINIT used in
assembly files.
[1] https://lkml.org/lkml/2013/5/20/589
Cc: Richard Kuo <rkuo@codeaurora.org>
Acked-by: Richard Kuo <rkuo@codeaurora.org>
Cc: linux-hexagon@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
153 lines
3.7 KiB
C
153 lines
3.7 KiB
C
/*
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* Arch related setup for Hexagon
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*
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* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
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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 and
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* only version 2 as published by the Free Software Foundation.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/mmzone.h>
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#include <linux/mm.h>
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#include <linux/seq_file.h>
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#include <linux/console.h>
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#include <linux/of_fdt.h>
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#include <asm/io.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/processor.h>
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#include <asm/hexagon_vm.h>
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#include <asm/vm_mmu.h>
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#include <asm/time.h>
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#ifdef CONFIG_OF
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#include <asm/prom.h>
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#endif
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char cmd_line[COMMAND_LINE_SIZE];
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static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
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int on_simulator;
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void calibrate_delay(void)
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{
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loops_per_jiffy = thread_freq_mhz * 1000000 / HZ;
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}
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/*
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* setup_arch - high level architectural setup routine
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* @cmdline_p: pointer to pointer to command-line arguments
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*/
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void __init setup_arch(char **cmdline_p)
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{
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char *p = &external_cmdline_buffer;
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/*
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* These will eventually be pulled in via either some hypervisor
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* or devicetree description. Hardwiring for now.
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*/
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pcycle_freq_mhz = 600;
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thread_freq_mhz = 100;
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sleep_clk_freq = 32000;
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/*
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* Set up event bindings to handle exceptions and interrupts.
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*/
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__vmsetvec(_K_VM_event_vector);
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printk(KERN_INFO "PHYS_OFFSET=0x%08x\n", PHYS_OFFSET);
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/*
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* Simulator has a few differences from the hardware.
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* For now, check uninitialized-but-mapped memory
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* prior to invoking setup_arch_memory().
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*/
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if (*(int *)((unsigned long)_end + 8) == 0x1f1f1f1f)
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on_simulator = 1;
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else
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on_simulator = 0;
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if (p[0] != '\0')
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strlcpy(boot_command_line, p, COMMAND_LINE_SIZE);
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else
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strlcpy(boot_command_line, default_command_line,
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COMMAND_LINE_SIZE);
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/*
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* boot_command_line and the value set up by setup_arch
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* are both picked up by the init code. If no reason to
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* make them different, pass the same pointer back.
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*/
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strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
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*cmdline_p = cmd_line;
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parse_early_param();
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setup_arch_memory();
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#ifdef CONFIG_SMP
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smp_start_cpus();
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#endif
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}
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/*
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* Functions for dumping CPU info via /proc
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* Probably should move to kernel/proc.c or something.
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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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return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : 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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/*
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* Eventually this will dump information about
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* CPU properties like ISA level, TLB size, etc.
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*/
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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int cpu = (unsigned long) v - 1;
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#ifdef CONFIG_SMP
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if (!cpu_online(cpu))
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return 0;
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#endif
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seq_printf(m, "processor\t: %d\n", cpu);
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seq_printf(m, "model name\t: Hexagon Virtual Machine\n");
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seq_printf(m, "BogoMips\t: %lu.%02lu\n",
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(loops_per_jiffy * HZ) / 500000,
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((loops_per_jiffy * HZ) / 5000) % 100);
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seq_printf(m, "\n");
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return 0;
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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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