microblaze_v8: memory inicialization, MMU, TLB

/*

 * Copyright (C) 2006 Atmark Techno, Inc.

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License. See the file "COPYING" in the main directory of this archive

 * for more details.

 */

#ifndef _ASM_MICROBLAZE_MMU_H

#define _ASM_MICROBLAZE_MMU_H

#ifndef __ASSEMBLY__

typedef struct {

	struct vm_list_struct	*vmlist;

	unsigned long		end_brk;

} mm_context_t;

#endif /* __ASSEMBLY__ */

#endif /* _ASM_MICROBLAZE_MMU_H */

/*

 * Copyright (C) 2006 Atmark Techno, Inc.

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License. See the file "COPYING" in the main directory of this archive

 * for more details.

 */

#ifndef _ASM_MICROBLAZE_MMU_CONTEXT_H

#define _ASM_MICROBLAZE_MMU_CONTEXT_H

# define init_new_context(tsk, mm)		({ 0; })

# define enter_lazy_tlb(mm, tsk)		do {} while (0)

# define change_mm_context(old, ctx, _pml4)	do {} while (0)

# define destroy_context(mm)			do {} while (0)

# define deactivate_mm(tsk, mm)			do {} while (0)

# define switch_mm(prev, next, tsk)		do {} while (0)

# define activate_mm(prev, next)		do {} while (0)

#endif /* _ASM_MICROBLAZE_MMU_CONTEXT_H */

/*

 * Copyright (C) 2006 Atmark Techno, Inc.

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License. See the file "COPYING" in the main directory of this archive

 * for more details.

 */

#ifndef _ASM_MICROBLAZE_TLB_H

#define _ASM_MICROBLAZE_TLB_H

#define tlb_flush(tlb)	do {} while (0)

#include <asm-generic/tlb.h>

#endif /* _ASM_MICROBLAZE_TLB_H */

/*

 * Copyright (C) 2006 Atmark Techno, Inc.

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License. See the file "COPYING" in the main directory of this archive

 * for more details.

 */

#ifndef _ASM_MICROBLAZE_TLBFLUSH_H

#define _ASM_MICROBLAZE_TLBFLUSH_H

#define flush_tlb()				BUG()

#define flush_tlb_all()				BUG()

#define flush_tlb_mm(mm)			BUG()

#define flush_tlb_page(vma, addr)		BUG()

#define flush_tlb_range(mm, start, end)		BUG()

#define flush_tlb_pgtables(mm, start, end)	BUG()

#define flush_tlb_kernel_range(start, end)	BUG()

#endif /* _ASM_MICROBLAZE_TLBFLUSH_H */

/*

 * Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>

 * Copyright (C) 2006 Atmark Techno, Inc.

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License. See the file "COPYING" in the main directory of this archive

 * for more details.

 */

#include <linux/bootmem.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/lmb.h>

#include <linux/mm.h> /* mem_init */

#include <linux/initrd.h>

#include <linux/pagemap.h>

#include <linux/pfn.h>

#include <linux/swap.h>

#include <asm/page.h>

#include <asm/mmu_context.h>

#include <asm/pgalloc.h>

#include <asm/sections.h>

#include <asm/tlb.h>

unsigned int __page_offset;

/* EXPORT_SYMBOL(__page_offset); */

char *klimit = _end;

/*

 * Initialize the bootmem system and give it all the memory we

 * have available.

 */

unsigned int memory_start;

unsigned int memory_end; /* due to mm/nommu.c */

unsigned int memory_size;

/*

 * paging_init() sets up the page tables - in fact we've already done this.

 */

static void __init paging_init(void)

{

	int i;

	unsigned long zones_size[MAX_NR_ZONES];

	/*

	 * old: we can DMA to/from any address.put all page into ZONE_DMA

	 * We use only ZONE_NORMAL

	 */

	zones_size[ZONE_NORMAL] = max_mapnr;

	/* every other zones are empty */

	for (i = 1; i < MAX_NR_ZONES; i++)

		zones_size[i] = 0;

	free_area_init(zones_size);

}

void __init setup_memory(void)

{

	int i;

	unsigned long map_size;

	u32 kernel_align_start, kernel_align_size;

	/* Find main memory where is the kernel */

	for (i = 0; i < lmb.memory.cnt; i++) {

		memory_start = (u32) lmb.memory.region[i].base;

		memory_end = (u32) lmb.memory.region[i].base

				+ (u32) lmb.memory.region[i].size;

		if ((memory_start <= (u32)_text) &&

					((u32)_text <= memory_end)) {

			memory_size = memory_end - memory_start;

			PAGE_OFFSET = memory_start;

			printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "

				"size 0x%08x\n", __func__, memory_start,

						memory_end, memory_size);

			break;

		}

	}

	if (!memory_start || !memory_end) {

		panic("%s: Missing memory setting 0x%08x-0x%08x\n",

			__func__, memory_start, memory_end);

	}

	/* reservation of region where is the kernel */

	kernel_align_start = PAGE_DOWN((u32)_text);

	/* ALIGN can be remove because _end in vmlinux.lds.S is align */

	kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;

	lmb_reserve(kernel_align_start, kernel_align_size);

	printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",

		__func__, kernel_align_start, kernel_align_start

			+ kernel_align_size, kernel_align_size);

	/*

	 * Kernel:

	 * start: base phys address of kernel - page align

	 * end: base phys address of kernel - page align

	 *

	 * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)

	 * max_low_pfn

	 * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)

	 * num_physpages - number of all pages

	 */

	/* memory start is from the kernel end (aligned) to higher addr */

	min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */

	/* RAM is assumed contiguous */

	num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;

	max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;

	printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);

	printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);

	printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);

	/*

	 * Find an area to use for the bootmem bitmap.

	 * We look for the first area which is at least

	 * 128kB in length (128kB is enough for a bitmap

	 * for 4GB of memory, using 4kB pages), plus 1 page

	 * (in case the address isn't page-aligned).

	 */

	map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)_end)),

					min_low_pfn, max_low_pfn);

	lmb_reserve(PFN_UP(TOPHYS((u32)_end)) << PAGE_SHIFT, map_size);

	/* free bootmem is whole main memory */

	free_bootmem(memory_start, memory_size);

	/* reserve allocate blocks */

	for (i = 0; i < lmb.reserved.cnt; i++) {

		pr_debug("reserved %d - 0x%08x-0x%08x\n", i,

			(u32) lmb.reserved.region[i].base,

			(u32) lmb_size_bytes(&lmb.reserved, i));

		reserve_bootmem(lmb.reserved.region[i].base,

			lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT);

	}

	paging_init();

}

void free_init_pages(char *what, unsigned long begin, unsigned long end)

{

	unsigned long addr;

	for (addr = begin; addr < end; addr += PAGE_SIZE) {

		ClearPageReserved(virt_to_page(addr));

		init_page_count(virt_to_page(addr));

		memset((void *)addr, 0xcc, PAGE_SIZE);

		free_page(addr);

		totalram_pages++;

	}

	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);

}

#ifdef CONFIG_BLK_DEV_INITRD

void free_initrd_mem(unsigned long start, unsigned long end)

{

	int pages = 0;

	for (; start < end; start += PAGE_SIZE) {

		ClearPageReserved(virt_to_page(start));

		init_page_count(virt_to_page(start));

		free_page(start);

		totalram_pages++;

		pages++;

	}

	printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages);

}

#endif

void free_initmem(void)

{

	free_init_pages("unused kernel memory",

			(unsigned long)(&__init_begin),

			(unsigned long)(&__init_end));

}

/* FIXME from arch/powerpc/mm/mem.c*/

void show_mem(void)

{

	printk(KERN_NOTICE "%s\n", __func__);

}

void __init mem_init(void)

{

	high_memory = (void *)__va(memory_end);

	/* this will put all memory onto the freelists */

	totalram_pages += free_all_bootmem();

	printk(KERN_INFO "Memory: %luk/%luk available\n",

	       (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),

	       num_physpages << (PAGE_SHIFT-10));

}

/* Check against bounds of physical memory */

int ___range_ok(unsigned long addr, unsigned long size)

{

	return ((addr < memory_start) ||

		((addr + size) > memory_end));

}