![Jiang Liu](/assets/img/avatar_default.png)
Normalize global variables exported by vmlinux.lds to conform usage guidelines from include/asm-generic/sections.h. Use _text to mark the start of the kernel image including the head text, and _stext to mark the start of the .text section. Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
610 lines
15 KiB
C
610 lines
15 KiB
C
/*
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* Copyright (C) 2004-2006 Atmel Corporation
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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/clk.h>
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#include <linux/init.h>
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#include <linux/initrd.h>
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#include <linux/sched.h>
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#include <linux/console.h>
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#include <linux/ioport.h>
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#include <linux/bootmem.h>
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/pfn.h>
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#include <linux/root_dev.h>
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#include <linux/cpu.h>
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#include <linux/kernel.h>
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#include <asm/sections.h>
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#include <asm/processor.h>
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#include <asm/pgtable.h>
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#include <asm/setup.h>
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#include <asm/sysreg.h>
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#include <mach/board.h>
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#include <mach/init.h>
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extern int root_mountflags;
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/*
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* Initialize loops_per_jiffy as 5000000 (500MIPS).
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* Better make it too large than too small...
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*/
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struct avr32_cpuinfo boot_cpu_data = {
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.loops_per_jiffy = 5000000
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};
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EXPORT_SYMBOL(boot_cpu_data);
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static char __initdata command_line[COMMAND_LINE_SIZE];
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/*
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* Standard memory resources
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*/
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static struct resource __initdata kernel_data = {
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.name = "Kernel data",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_MEM,
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};
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static struct resource __initdata kernel_code = {
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.name = "Kernel code",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_MEM,
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.sibling = &kernel_data,
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};
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/*
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* Available system RAM and reserved regions as singly linked
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* lists. These lists are traversed using the sibling pointer in
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* struct resource and are kept sorted at all times.
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*/
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static struct resource *__initdata system_ram;
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static struct resource *__initdata reserved = &kernel_code;
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/*
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* We need to allocate these before the bootmem allocator is up and
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* running, so we need this "cache". 32 entries are probably enough
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* for all but the most insanely complex systems.
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*/
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static struct resource __initdata res_cache[32];
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static unsigned int __initdata res_cache_next_free;
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static void __init resource_init(void)
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{
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struct resource *mem, *res;
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struct resource *new;
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kernel_code.start = __pa(init_mm.start_code);
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for (mem = system_ram; mem; mem = mem->sibling) {
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new = alloc_bootmem_low(sizeof(struct resource));
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memcpy(new, mem, sizeof(struct resource));
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new->sibling = NULL;
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if (request_resource(&iomem_resource, new))
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printk(KERN_WARNING "Bad RAM resource %08x-%08x\n",
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mem->start, mem->end);
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}
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for (res = reserved; res; res = res->sibling) {
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new = alloc_bootmem_low(sizeof(struct resource));
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memcpy(new, res, sizeof(struct resource));
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new->sibling = NULL;
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if (insert_resource(&iomem_resource, new))
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printk(KERN_WARNING
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"Bad reserved resource %s (%08x-%08x)\n",
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res->name, res->start, res->end);
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}
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}
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static void __init
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add_physical_memory(resource_size_t start, resource_size_t end)
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{
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struct resource *new, *next, **pprev;
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for (pprev = &system_ram, next = system_ram; next;
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pprev = &next->sibling, next = next->sibling) {
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if (end < next->start)
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break;
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if (start <= next->end) {
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printk(KERN_WARNING
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"Warning: Physical memory map is broken\n");
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printk(KERN_WARNING
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"Warning: %08x-%08x overlaps %08x-%08x\n",
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start, end, next->start, next->end);
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return;
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}
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}
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if (res_cache_next_free >= ARRAY_SIZE(res_cache)) {
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printk(KERN_WARNING
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"Warning: Failed to add physical memory %08x-%08x\n",
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start, end);
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return;
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}
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new = &res_cache[res_cache_next_free++];
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new->start = start;
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new->end = end;
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new->name = "System RAM";
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new->flags = IORESOURCE_MEM;
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*pprev = new;
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}
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static int __init
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add_reserved_region(resource_size_t start, resource_size_t end,
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const char *name)
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{
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struct resource *new, *next, **pprev;
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if (end < start)
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return -EINVAL;
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if (res_cache_next_free >= ARRAY_SIZE(res_cache))
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return -ENOMEM;
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for (pprev = &reserved, next = reserved; next;
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pprev = &next->sibling, next = next->sibling) {
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if (end < next->start)
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break;
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if (start <= next->end)
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return -EBUSY;
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}
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new = &res_cache[res_cache_next_free++];
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new->start = start;
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new->end = end;
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new->name = name;
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new->sibling = next;
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new->flags = IORESOURCE_MEM;
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*pprev = new;
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return 0;
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}
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static unsigned long __init
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find_free_region(const struct resource *mem, resource_size_t size,
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resource_size_t align)
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{
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struct resource *res;
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unsigned long target;
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target = ALIGN(mem->start, align);
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for (res = reserved; res; res = res->sibling) {
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if ((target + size) <= res->start)
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break;
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if (target <= res->end)
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target = ALIGN(res->end + 1, align);
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}
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if ((target + size) > (mem->end + 1))
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return mem->end + 1;
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return target;
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}
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static int __init
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alloc_reserved_region(resource_size_t *start, resource_size_t size,
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resource_size_t align, const char *name)
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{
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struct resource *mem;
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resource_size_t target;
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int ret;
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for (mem = system_ram; mem; mem = mem->sibling) {
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target = find_free_region(mem, size, align);
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if (target <= mem->end) {
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ret = add_reserved_region(target, target + size - 1,
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name);
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if (!ret)
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*start = target;
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return ret;
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}
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}
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return -ENOMEM;
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}
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/*
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* Early framebuffer allocation. Works as follows:
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* - If fbmem_size is zero, nothing will be allocated or reserved.
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* - If fbmem_start is zero when setup_bootmem() is called,
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* a block of fbmem_size bytes will be reserved before bootmem
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* initialization. It will be aligned to the largest page size
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* that fbmem_size is a multiple of.
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* - If fbmem_start is nonzero, an area of size fbmem_size will be
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* reserved at the physical address fbmem_start if possible. If
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* it collides with other reserved memory, a different block of
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* same size will be allocated, just as if fbmem_start was zero.
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*
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* Board-specific code may use these variables to set up platform data
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* for the framebuffer driver if fbmem_size is nonzero.
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*/
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resource_size_t __initdata fbmem_start;
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resource_size_t __initdata fbmem_size;
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/*
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* "fbmem=xxx[kKmM]" allocates the specified amount of boot memory for
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* use as framebuffer.
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*
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* "fbmem=xxx[kKmM]@yyy[kKmM]" defines a memory region of size xxx and
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* starting at yyy to be reserved for use as framebuffer.
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*
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* The kernel won't verify that the memory region starting at yyy
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* actually contains usable RAM.
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*/
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static int __init early_parse_fbmem(char *p)
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{
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int ret;
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unsigned long align;
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fbmem_size = memparse(p, &p);
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if (*p == '@') {
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fbmem_start = memparse(p + 1, &p);
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ret = add_reserved_region(fbmem_start,
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fbmem_start + fbmem_size - 1,
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"Framebuffer");
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if (ret) {
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printk(KERN_WARNING
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"Failed to reserve framebuffer memory\n");
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fbmem_start = 0;
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}
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}
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if (!fbmem_start) {
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if ((fbmem_size & 0x000fffffUL) == 0)
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align = 0x100000; /* 1 MiB */
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else if ((fbmem_size & 0x0000ffffUL) == 0)
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align = 0x10000; /* 64 KiB */
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else
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align = 0x1000; /* 4 KiB */
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ret = alloc_reserved_region(&fbmem_start, fbmem_size,
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align, "Framebuffer");
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if (ret) {
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printk(KERN_WARNING
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"Failed to allocate framebuffer memory\n");
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fbmem_size = 0;
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} else {
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memset(__va(fbmem_start), 0, fbmem_size);
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}
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}
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return 0;
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}
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early_param("fbmem", early_parse_fbmem);
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/*
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* Pick out the memory size. We look for mem=size@start,
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* where start and size are "size[KkMmGg]"
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*/
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static int __init early_mem(char *p)
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{
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resource_size_t size, start;
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start = system_ram->start;
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size = memparse(p, &p);
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if (*p == '@')
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start = memparse(p + 1, &p);
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system_ram->start = start;
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system_ram->end = system_ram->start + size - 1;
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return 0;
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}
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early_param("mem", early_mem);
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static int __init parse_tag_core(struct tag *tag)
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{
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if (tag->hdr.size > 2) {
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if ((tag->u.core.flags & 1) == 0)
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root_mountflags &= ~MS_RDONLY;
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ROOT_DEV = new_decode_dev(tag->u.core.rootdev);
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}
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return 0;
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}
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__tagtable(ATAG_CORE, parse_tag_core);
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static int __init parse_tag_mem(struct tag *tag)
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{
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unsigned long start, end;
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/*
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* Ignore zero-sized entries. If we're running standalone, the
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* SDRAM code may emit such entries if something goes
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* wrong...
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*/
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if (tag->u.mem_range.size == 0)
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return 0;
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start = tag->u.mem_range.addr;
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end = tag->u.mem_range.addr + tag->u.mem_range.size - 1;
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add_physical_memory(start, end);
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return 0;
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}
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__tagtable(ATAG_MEM, parse_tag_mem);
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static int __init parse_tag_rdimg(struct tag *tag)
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{
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#ifdef CONFIG_BLK_DEV_INITRD
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struct tag_mem_range *mem = &tag->u.mem_range;
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int ret;
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if (initrd_start) {
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printk(KERN_WARNING
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"Warning: Only the first initrd image will be used\n");
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return 0;
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}
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ret = add_reserved_region(mem->addr, mem->addr + mem->size - 1,
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"initrd");
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if (ret) {
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printk(KERN_WARNING
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"Warning: Failed to reserve initrd memory\n");
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return ret;
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}
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initrd_start = (unsigned long)__va(mem->addr);
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initrd_end = initrd_start + mem->size;
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#else
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printk(KERN_WARNING "RAM disk image present, but "
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"no initrd support in kernel, ignoring\n");
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#endif
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return 0;
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}
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__tagtable(ATAG_RDIMG, parse_tag_rdimg);
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static int __init parse_tag_rsvd_mem(struct tag *tag)
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{
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struct tag_mem_range *mem = &tag->u.mem_range;
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return add_reserved_region(mem->addr, mem->addr + mem->size - 1,
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"Reserved");
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}
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__tagtable(ATAG_RSVD_MEM, parse_tag_rsvd_mem);
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static int __init parse_tag_cmdline(struct tag *tag)
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{
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strlcpy(boot_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
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return 0;
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}
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__tagtable(ATAG_CMDLINE, parse_tag_cmdline);
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static int __init parse_tag_clock(struct tag *tag)
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{
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/*
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* We'll figure out the clocks by peeking at the system
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* manager regs directly.
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*/
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return 0;
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}
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__tagtable(ATAG_CLOCK, parse_tag_clock);
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/*
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* The board_number correspond to the bd->bi_board_number in U-Boot. This
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* parameter is only available during initialisation and can be used in some
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* kind of board identification.
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*/
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u32 __initdata board_number;
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static int __init parse_tag_boardinfo(struct tag *tag)
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{
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board_number = tag->u.boardinfo.board_number;
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return 0;
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}
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__tagtable(ATAG_BOARDINFO, parse_tag_boardinfo);
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/*
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* Scan the tag table for this tag, and call its parse function. The
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* tag table is built by the linker from all the __tagtable
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* declarations.
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*/
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static int __init parse_tag(struct tag *tag)
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{
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extern struct tagtable __tagtable_begin, __tagtable_end;
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struct tagtable *t;
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for (t = &__tagtable_begin; t < &__tagtable_end; t++)
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if (tag->hdr.tag == t->tag) {
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t->parse(tag);
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break;
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}
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return t < &__tagtable_end;
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}
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/*
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* Parse all tags in the list we got from the boot loader
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*/
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static void __init parse_tags(struct tag *t)
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{
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for (; t->hdr.tag != ATAG_NONE; t = tag_next(t))
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if (!parse_tag(t))
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printk(KERN_WARNING
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"Ignoring unrecognised tag 0x%08x\n",
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t->hdr.tag);
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}
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/*
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* Find a free memory region large enough for storing the
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* bootmem bitmap.
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*/
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static unsigned long __init
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find_bootmap_pfn(const struct resource *mem)
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{
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unsigned long bootmap_pages, bootmap_len;
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unsigned long node_pages = PFN_UP(resource_size(mem));
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unsigned long bootmap_start;
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bootmap_pages = bootmem_bootmap_pages(node_pages);
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bootmap_len = bootmap_pages << PAGE_SHIFT;
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/*
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* Find a large enough region without reserved pages for
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* storing the bootmem bitmap. We can take advantage of the
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* fact that all lists have been sorted.
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*
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* We have to check that we don't collide with any reserved
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* regions, which includes the kernel image and any RAMDISK
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* images.
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*/
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bootmap_start = find_free_region(mem, bootmap_len, PAGE_SIZE);
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return bootmap_start >> PAGE_SHIFT;
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}
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#define MAX_LOWMEM HIGHMEM_START
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#define MAX_LOWMEM_PFN PFN_DOWN(MAX_LOWMEM)
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static void __init setup_bootmem(void)
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{
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unsigned bootmap_size;
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unsigned long first_pfn, bootmap_pfn, pages;
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unsigned long max_pfn, max_low_pfn;
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unsigned node = 0;
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struct resource *res;
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printk(KERN_INFO "Physical memory:\n");
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for (res = system_ram; res; res = res->sibling)
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printk(" %08x-%08x\n", res->start, res->end);
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printk(KERN_INFO "Reserved memory:\n");
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for (res = reserved; res; res = res->sibling)
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printk(" %08x-%08x: %s\n",
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res->start, res->end, res->name);
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nodes_clear(node_online_map);
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if (system_ram->sibling)
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printk(KERN_WARNING "Only using first memory bank\n");
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for (res = system_ram; res; res = NULL) {
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first_pfn = PFN_UP(res->start);
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max_low_pfn = max_pfn = PFN_DOWN(res->end + 1);
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bootmap_pfn = find_bootmap_pfn(res);
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if (bootmap_pfn > max_pfn)
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panic("No space for bootmem bitmap!\n");
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if (max_low_pfn > MAX_LOWMEM_PFN) {
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max_low_pfn = MAX_LOWMEM_PFN;
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#ifndef CONFIG_HIGHMEM
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/*
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* Lowmem is memory that can be addressed
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* directly through P1/P2
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*/
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printk(KERN_WARNING
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"Node %u: Only %ld MiB of memory will be used.\n",
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node, MAX_LOWMEM >> 20);
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printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
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#else
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#error HIGHMEM is not supported by AVR32 yet
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#endif
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}
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/* Initialize the boot-time allocator with low memory only. */
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bootmap_size = init_bootmem_node(NODE_DATA(node), bootmap_pfn,
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first_pfn, max_low_pfn);
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/*
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* Register fully available RAM pages with the bootmem
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* allocator.
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*/
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pages = max_low_pfn - first_pfn;
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free_bootmem_node (NODE_DATA(node), PFN_PHYS(first_pfn),
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PFN_PHYS(pages));
|
|
|
|
/* Reserve space for the bootmem bitmap... */
|
|
reserve_bootmem_node(NODE_DATA(node),
|
|
PFN_PHYS(bootmap_pfn),
|
|
bootmap_size,
|
|
BOOTMEM_DEFAULT);
|
|
|
|
/* ...and any other reserved regions. */
|
|
for (res = reserved; res; res = res->sibling) {
|
|
if (res->start > PFN_PHYS(max_pfn))
|
|
break;
|
|
|
|
/*
|
|
* resource_init will complain about partial
|
|
* overlaps, so we'll just ignore such
|
|
* resources for now.
|
|
*/
|
|
if (res->start >= PFN_PHYS(first_pfn)
|
|
&& res->end < PFN_PHYS(max_pfn))
|
|
reserve_bootmem_node(NODE_DATA(node),
|
|
res->start,
|
|
resource_size(res),
|
|
BOOTMEM_DEFAULT);
|
|
}
|
|
|
|
node_set_online(node);
|
|
}
|
|
}
|
|
|
|
void __init setup_arch (char **cmdline_p)
|
|
{
|
|
struct clk *cpu_clk;
|
|
|
|
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;
|
|
|
|
/*
|
|
* Include .init section to make allocations easier. It will
|
|
* be removed before the resource is actually requested.
|
|
*/
|
|
kernel_code.start = __pa(__init_begin);
|
|
kernel_code.end = __pa(init_mm.end_code - 1);
|
|
kernel_data.start = __pa(init_mm.end_code);
|
|
kernel_data.end = __pa(init_mm.brk - 1);
|
|
|
|
parse_tags(bootloader_tags);
|
|
|
|
setup_processor();
|
|
setup_platform();
|
|
setup_board();
|
|
|
|
cpu_clk = clk_get(NULL, "cpu");
|
|
if (IS_ERR(cpu_clk)) {
|
|
printk(KERN_WARNING "Warning: Unable to get CPU clock\n");
|
|
} else {
|
|
unsigned long cpu_hz = clk_get_rate(cpu_clk);
|
|
|
|
/*
|
|
* Well, duh, but it's probably a good idea to
|
|
* increment the use count.
|
|
*/
|
|
clk_enable(cpu_clk);
|
|
|
|
boot_cpu_data.clk = cpu_clk;
|
|
boot_cpu_data.loops_per_jiffy = cpu_hz * 4;
|
|
printk("CPU: Running at %lu.%03lu MHz\n",
|
|
((cpu_hz + 500) / 1000) / 1000,
|
|
((cpu_hz + 500) / 1000) % 1000);
|
|
}
|
|
|
|
strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
|
|
*cmdline_p = command_line;
|
|
parse_early_param();
|
|
|
|
setup_bootmem();
|
|
|
|
#ifdef CONFIG_VT
|
|
conswitchp = &dummy_con;
|
|
#endif
|
|
|
|
paging_init();
|
|
resource_init();
|
|
}
|