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linux-sg2042/arch/unicore32/kernel/setup.c

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/*
* linux/arch/unicore32/kernel/setup.c
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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/module.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/utsname.h>
#include <linux/initrd.h>
#include <linux/console.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/screen_info.h>
#include <linux/init.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/memblock.h>
#include <linux/elf.h>
#include <linux/io.h>
#include <asm/cputype.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/traps.h>
#include <asm/memblock.h>
#include "setup.h"
#ifndef MEM_SIZE
#define MEM_SIZE (16*1024*1024)
#endif
struct stack {
u32 irq[3];
u32 abt[3];
u32 und[3];
} ____cacheline_aligned;
static struct stack stacks[NR_CPUS];
#ifdef CONFIG_VGA_CONSOLE
struct screen_info screen_info;
#endif
char elf_platform[ELF_PLATFORM_SIZE];
EXPORT_SYMBOL(elf_platform);
static char __initdata cmd_line[COMMAND_LINE_SIZE];
static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
/*
* Standard memory resources
*/
static struct resource mem_res[] = {
{
.name = "Kernel code",
.start = 0,
.end = 0,
.flags = IORESOURCE_MEM
},
{
.name = "Kernel data",
.start = 0,
.end = 0,
.flags = IORESOURCE_MEM
}
};
#define kernel_code mem_res[0]
#define kernel_data mem_res[1]
/*
* These functions re-use the assembly code in head.S, which
* already provide the required functionality.
*/
static void __init setup_processor(void)
{
printk(KERN_DEFAULT "CPU: UniCore-II [%08x] revision %d, cr=%08lx\n",
uc32_cpuid, (int)(uc32_cpuid >> 16) & 15, cr_alignment);
sprintf(init_utsname()->machine, "puv3");
sprintf(elf_platform, "ucv2");
}
/*
* cpu_init - initialise one CPU.
*
* cpu_init sets up the per-CPU stacks.
*/
void cpu_init(void)
{
unsigned int cpu = smp_processor_id();
struct stack *stk = &stacks[cpu];
/*
* setup stacks for re-entrant exception handlers
*/
__asm__ (
"mov.a asr, %1\n\t"
"add sp, %0, %2\n\t"
"mov.a asr, %3\n\t"
"add sp, %0, %4\n\t"
"mov.a asr, %5\n\t"
"add sp, %0, %6\n\t"
"mov.a asr, %7"
:
: "r" (stk),
"r" (PSR_R_BIT | PSR_I_BIT | INTR_MODE),
"I" (offsetof(struct stack, irq[0])),
"r" (PSR_R_BIT | PSR_I_BIT | ABRT_MODE),
"I" (offsetof(struct stack, abt[0])),
"r" (PSR_R_BIT | PSR_I_BIT | EXTN_MODE),
"I" (offsetof(struct stack, und[0])),
"r" (PSR_R_BIT | PSR_I_BIT | PRIV_MODE)
: "r30", "cc");
}
static int __init uc32_add_memory(unsigned long start, unsigned long size)
{
struct membank *bank = &meminfo.bank[meminfo.nr_banks];
if (meminfo.nr_banks >= NR_BANKS) {
printk(KERN_CRIT "NR_BANKS too low, "
"ignoring memory at %#lx\n", start);
return -EINVAL;
}
/*
* Ensure that start/size are aligned to a page boundary.
* Size is appropriately rounded down, start is rounded up.
*/
size -= start & ~PAGE_MASK;
bank->start = PAGE_ALIGN(start);
bank->size = size & PAGE_MASK;
/*
* Check whether this memory region has non-zero size or
* invalid node number.
*/
if (bank->size == 0)
return -EINVAL;
meminfo.nr_banks++;
return 0;
}
/*
* Pick out the memory size. We look for mem=size@start,
* where start and size are "size[KkMm]"
*/
static int __init early_mem(char *p)
{
static int usermem __initdata = 1;
unsigned long size, start;
char *endp;
/*
* If the user specifies memory size, we
* blow away any automatically generated
* size.
*/
if (usermem) {
usermem = 0;
meminfo.nr_banks = 0;
}
start = PHYS_OFFSET;
size = memparse(p, &endp);
if (*endp == '@')
start = memparse(endp + 1, NULL);
uc32_add_memory(start, size);
return 0;
}
early_param("mem", early_mem);
static void __init
request_standard_resources(struct meminfo *mi)
{
struct resource *res;
int i;
kernel_code.start = virt_to_phys(_stext);
kernel_code.end = virt_to_phys(_etext - 1);
kernel_data.start = virt_to_phys(_sdata);
kernel_data.end = virt_to_phys(_end - 1);
for (i = 0; i < mi->nr_banks; i++) {
if (mi->bank[i].size == 0)
continue;
res = alloc_bootmem_low(sizeof(*res));
res->name = "System RAM";
res->start = mi->bank[i].start;
res->end = mi->bank[i].start + mi->bank[i].size - 1;
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
request_resource(&iomem_resource, res);
if (kernel_code.start >= res->start &&
kernel_code.end <= res->end)
request_resource(res, &kernel_code);
if (kernel_data.start >= res->start &&
kernel_data.end <= res->end)
request_resource(res, &kernel_data);
}
}
static void (*init_machine)(void) __initdata;
static int __init customize_machine(void)
{
/* customizes platform devices, or adds new ones */
if (init_machine)
init_machine();
return 0;
}
arch_initcall(customize_machine);
void __init setup_arch(char **cmdline_p)
{
char *from = default_command_line;
setup_processor();
init_mm.start_code = (unsigned long) _stext;
init_mm.end_code = (unsigned long) _etext;
init_mm.end_data = (unsigned long) _edata;
init_mm.brk = (unsigned long) _end;
/* parse_early_param needs a boot_command_line */
strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
/* populate cmd_line too for later use, preserving boot_command_line */
strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
*cmdline_p = cmd_line;
parse_early_param();
uc32_memblock_init(&meminfo);
paging_init();
request_standard_resources(&meminfo);
cpu_init();
/*
* Set up various architecture-specific pointers
*/
init_machine = puv3_core_init;
#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
conswitchp = &dummy_con;
#endif
#endif
early_trap_init();
}
static struct cpu cpuinfo_unicore;
static int __init topology_init(void)
{
int i;
for_each_possible_cpu(i)
register_cpu(&cpuinfo_unicore, i);
return 0;
}
subsys_initcall(topology_init);
#ifdef CONFIG_HAVE_PROC_CPU
static int __init proc_cpu_init(void)
{
struct proc_dir_entry *res;
res = proc_mkdir("cpu", NULL);
if (!res)
return -ENOMEM;
return 0;
}
fs_initcall(proc_cpu_init);
#endif
static int c_show(struct seq_file *m, void *v)
{
seq_printf(m, "Processor\t: UniCore-II rev %d (%s)\n",
(int)(uc32_cpuid >> 16) & 15, elf_platform);
seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
loops_per_jiffy / (500000/HZ),
(loops_per_jiffy / (5000/HZ)) % 100);
/* dump out the processor features */
seq_puts(m, "Features\t: CMOV UC-F64");
seq_printf(m, "\nCPU implementer\t: 0x%02x\n", uc32_cpuid >> 24);
seq_printf(m, "CPU architecture: 2\n");
seq_printf(m, "CPU revision\t: %d\n", (uc32_cpuid >> 16) & 15);
seq_printf(m, "Cache type\t: write-back\n"
"Cache clean\t: cp0 c5 ops\n"
"Cache lockdown\t: not support\n"
"Cache format\t: Harvard\n");
seq_puts(m, "\n");
seq_printf(m, "Hardware\t: PKUnity v3\n");
return 0;
}
static void *c_start(struct seq_file *m, loff_t *pos)
{
return *pos < 1 ? (void *)1 : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
++*pos;
return NULL;
}
static void c_stop(struct seq_file *m, void *v)
{
}
const struct seq_operations cpuinfo_op = {
.start = c_start,
.next = c_next,
.stop = c_stop,
.show = c_show
};
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