Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 667 insertions, 0 deletions

diff --git a/arch/ppc/mm/init.c b/arch/ppc/mm/init.c
new file mode 100644
index 00000000000..be02a7fec2b
--- /dev/null
+++ b/arch/ppc/mm/init.c
@@ -0,0 +1,667 @@
+/*
+ *  PowerPC version
+ *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ *  Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
+ *  and Cort Dougan (PReP) (cort@cs.nmt.edu)
+ *    Copyright (C) 1996 Paul Mackerras
+ *  Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
+ *  PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
+ *
+ *  Derived from "arch/i386/mm/init.c"
+ *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version
+ *  2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/highmem.h>
+#include <linux/initrd.h>
+#include <linux/pagemap.h>
+
+#include <asm/pgalloc.h>
+#include <asm/prom.h>
+#include <asm/io.h>
+#include <asm/mmu_context.h>
+#include <asm/pgtable.h>
+#include <asm/mmu.h>
+#include <asm/smp.h>
+#include <asm/machdep.h>
+#include <asm/btext.h>
+#include <asm/tlb.h>
+#include <asm/bootinfo.h>
+
+#include "mem_pieces.h"
+#include "mmu_decl.h"
+
+#if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL)
+/* The ammount of lowmem must be within 0xF0000000 - KERNELBASE. */
+#if (CONFIG_LOWMEM_SIZE > (0xF0000000 - KERNELBASE))
+#error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_START_KERNEL"
+#endif
+#endif
+#define MAX_LOW_MEM	CONFIG_LOWMEM_SIZE
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+unsigned long total_memory;
+unsigned long total_lowmem;
+
+unsigned long ppc_memstart;
+unsigned long ppc_memoffset = PAGE_OFFSET;
+
+int mem_init_done;
+int init_bootmem_done;
+int boot_mapsize;
+#ifdef CONFIG_PPC_PMAC
+unsigned long agp_special_page;
+#endif
+
+extern char _end[];
+extern char etext[], _stext[];
+extern char __init_begin, __init_end;
+extern char __prep_begin, __prep_end;
+extern char __chrp_begin, __chrp_end;
+extern char __pmac_begin, __pmac_end;
+extern char __openfirmware_begin, __openfirmware_end;
+
+#ifdef CONFIG_HIGHMEM
+pte_t *kmap_pte;
+pgprot_t kmap_prot;
+
+EXPORT_SYMBOL(kmap_prot);
+EXPORT_SYMBOL(kmap_pte);
+#endif
+
+void MMU_init(void);
+void set_phys_avail(unsigned long total_ram);
+
+/* XXX should be in current.h  -- paulus */
+extern struct task_struct *current_set[NR_CPUS];
+
+char *klimit = _end;
+struct mem_pieces phys_avail;
+
+extern char *sysmap;
+extern unsigned long sysmap_size;
+
+/*
+ * this tells the system to map all of ram with the segregs
+ * (i.e. page tables) instead of the bats.
+ * -- Cort
+ */
+int __map_without_bats;
+int __map_without_ltlbs;
+
+/* max amount of RAM to use */
+unsigned long __max_memory;
+/* max amount of low RAM to map in */
+unsigned long __max_low_memory = MAX_LOW_MEM;
+
+void show_mem(void)
+{
+	int i,free = 0,total = 0,reserved = 0;
+	int shared = 0, cached = 0;
+	int highmem = 0;
+
+	printk("Mem-info:\n");
+	show_free_areas();
+	printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
+	i = max_mapnr;
+	while (i-- > 0) {
+		total++;
+		if (PageHighMem(mem_map+i))
+			highmem++;
+		if (PageReserved(mem_map+i))
+			reserved++;
+		else if (PageSwapCache(mem_map+i))
+			cached++;
+		else if (!page_count(mem_map+i))
+			free++;
+		else
+			shared += page_count(mem_map+i) - 1;
+	}
+	printk("%d pages of RAM\n",total);
+	printk("%d pages of HIGHMEM\n", highmem);
+	printk("%d free pages\n",free);
+	printk("%d reserved pages\n",reserved);
+	printk("%d pages shared\n",shared);
+	printk("%d pages swap cached\n",cached);
+}
+
+/* Free up now-unused memory */
+static void free_sec(unsigned long start, unsigned long end, const char *name)
+{
+	unsigned long cnt = 0;
+
+	while (start < end) {
+		ClearPageReserved(virt_to_page(start));
+		set_page_count(virt_to_page(start), 1);
+		free_page(start);
+		cnt++;
+		start += PAGE_SIZE;
+ 	}
+	if (cnt) {
+		printk(" %ldk %s", cnt << (PAGE_SHIFT - 10), name);
+		totalram_pages += cnt;
+	}
+}
+
+void free_initmem(void)
+{
+#define FREESEC(TYPE) \
+	free_sec((unsigned long)(&__ ## TYPE ## _begin), \
+		 (unsigned long)(&__ ## TYPE ## _end), \
+		 #TYPE);
+
+	printk ("Freeing unused kernel memory:");
+	FREESEC(init);
+	if (_machine != _MACH_Pmac)
+		FREESEC(pmac);
+	if (_machine != _MACH_chrp)
+		FREESEC(chrp);
+	if (_machine != _MACH_prep)
+		FREESEC(prep);
+	if (!have_of)
+		FREESEC(openfirmware);
+ 	printk("\n");
+#undef FREESEC
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+	printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
+
+	for (; start < end; start += PAGE_SIZE) {
+		ClearPageReserved(virt_to_page(start));
+		set_page_count(virt_to_page(start), 1);
+		free_page(start);
+		totalram_pages++;
+	}
+}
+#endif
+
+/*
+ * Check for command-line options that affect what MMU_init will do.
+ */
+void MMU_setup(void)
+{
+	/* Check for nobats option (used in mapin_ram). */
+	if (strstr(cmd_line, "nobats")) {
+		__map_without_bats = 1;
+	}
+
+	if (strstr(cmd_line, "noltlbs")) {
+		__map_without_ltlbs = 1;
+	}
+
+	/* Look for mem= option on command line */
+	if (strstr(cmd_line, "mem=")) {
+		char *p, *q;
+		unsigned long maxmem = 0;
+
+		for (q = cmd_line; (p = strstr(q, "mem=")) != 0; ) {
+			q = p + 4;
+			if (p > cmd_line && p[-1] != ' ')
+				continue;
+			maxmem = simple_strtoul(q, &q, 0);
+			if (*q == 'k' || *q == 'K') {
+				maxmem <<= 10;
+				++q;
+			} else if (*q == 'm' || *q == 'M') {
+				maxmem <<= 20;
+				++q;
+			}
+		}
+		__max_memory = maxmem;
+	}
+}
+
+/*
+ * MMU_init sets up the basic memory mappings for the kernel,
+ * including both RAM and possibly some I/O regions,
+ * and sets up the page tables and the MMU hardware ready to go.
+ */
+void __init MMU_init(void)
+{
+	if (ppc_md.progress)
+		ppc_md.progress("MMU:enter", 0x111);
+
+	/* parse args from command line */
+	MMU_setup();
+
+	/*
+	 * Figure out how much memory we have, how much
+	 * is lowmem, and how much is highmem.  If we were
+	 * passed the total memory size from the bootloader,
+	 * just use it.
+	 */
+	if (boot_mem_size)
+		total_memory = boot_mem_size;
+	else
+		total_memory = ppc_md.find_end_of_memory();
+
+	if (__max_memory && total_memory > __max_memory)
+		total_memory = __max_memory;
+	total_lowmem = total_memory;
+#ifdef CONFIG_FSL_BOOKE
+	/* Freescale Book-E parts expect lowmem to be mapped by fixed TLB
+	 * entries, so we need to adjust lowmem to match the amount we can map
+	 * in the fixed entries */
+	adjust_total_lowmem();
+#endif /* CONFIG_FSL_BOOKE */
+	if (total_lowmem > __max_low_memory) {
+		total_lowmem = __max_low_memory;
+#ifndef CONFIG_HIGHMEM
+		total_memory = total_lowmem;
+#endif /* CONFIG_HIGHMEM */
+	}
+	set_phys_avail(total_lowmem);
+
+	/* Initialize the MMU hardware */
+	if (ppc_md.progress)
+		ppc_md.progress("MMU:hw init", 0x300);
+	MMU_init_hw();
+
+	/* Map in all of RAM starting at KERNELBASE */
+	if (ppc_md.progress)
+		ppc_md.progress("MMU:mapin", 0x301);
+	mapin_ram();
+
+#ifdef CONFIG_HIGHMEM
+	ioremap_base = PKMAP_BASE;
+#else
+	ioremap_base = 0xfe000000UL;	/* for now, could be 0xfffff000 */
+#endif /* CONFIG_HIGHMEM */
+	ioremap_bot = ioremap_base;
+
+	/* Map in I/O resources */
+	if (ppc_md.progress)
+		ppc_md.progress("MMU:setio", 0x302);
+	if (ppc_md.setup_io_mappings)
+		ppc_md.setup_io_mappings();
+
+	/* Initialize the context management stuff */
+	mmu_context_init();
+
+	if (ppc_md.progress)
+		ppc_md.progress("MMU:exit", 0x211);
+
+#ifdef CONFIG_BOOTX_TEXT
+	/* By default, we are no longer mapped */
+       	boot_text_mapped = 0;
+	/* Must be done last, or ppc_md.progress will die. */
+	map_boot_text();
+#endif
+}
+
+/* This is only called until mem_init is done. */
+void __init *early_get_page(void)
+{
+	void *p;
+
+	if (init_bootmem_done) {
+		p = alloc_bootmem_pages(PAGE_SIZE);
+	} else {
+		p = mem_pieces_find(PAGE_SIZE, PAGE_SIZE);
+	}
+	return p;
+}
+
+/*
+ * Initialize the bootmem system and give it all the memory we
+ * have available.
+ */
+void __init do_init_bootmem(void)
+{
+	unsigned long start, size;
+	int i;
+
+	/*
+	 * 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).
+	 */
+	start = 0;
+	size = 0;
+	for (i = 0; i < phys_avail.n_regions; ++i) {
+		unsigned long a = phys_avail.regions[i].address;
+		unsigned long s = phys_avail.regions[i].size;
+		if (s <= size)
+			continue;
+		start = a;
+		size = s;
+		if (s >= 33 * PAGE_SIZE)
+			break;
+	}
+	start = PAGE_ALIGN(start);
+
+	min_low_pfn = start >> PAGE_SHIFT;
+	max_low_pfn = (PPC_MEMSTART + total_lowmem) >> PAGE_SHIFT;
+	max_pfn = (PPC_MEMSTART + total_memory) >> PAGE_SHIFT;
+	boot_mapsize = init_bootmem_node(&contig_page_data, min_low_pfn,
+					 PPC_MEMSTART >> PAGE_SHIFT,
+					 max_low_pfn);
+
+	/* remove the bootmem bitmap from the available memory */
+	mem_pieces_remove(&phys_avail, start, boot_mapsize, 1);
+
+	/* add everything in phys_avail into the bootmem map */
+	for (i = 0; i < phys_avail.n_regions; ++i)
+		free_bootmem(phys_avail.regions[i].address,
+			     phys_avail.regions[i].size);
+
+	init_bootmem_done = 1;
+}
+
+/*
+ * paging_init() sets up the page tables - in fact we've already done this.
+ */
+void __init paging_init(void)
+{
+	unsigned long zones_size[MAX_NR_ZONES], i;
+
+#ifdef CONFIG_HIGHMEM
+	map_page(PKMAP_BASE, 0, 0);	/* XXX gross */
+	pkmap_page_table = pte_offset_kernel(pmd_offset(pgd_offset_k
+			(PKMAP_BASE), PKMAP_BASE), PKMAP_BASE);
+	map_page(KMAP_FIX_BEGIN, 0, 0);	/* XXX gross */
+	kmap_pte = pte_offset_kernel(pmd_offset(pgd_offset_k
+			(KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN);
+	kmap_prot = PAGE_KERNEL;
+#endif /* CONFIG_HIGHMEM */
+
+	/*
+	 * All pages are DMA-able so we put them all in the DMA zone.
+	 */
+	zones_size[ZONE_DMA] = total_lowmem >> PAGE_SHIFT;
+	for (i = 1; i < MAX_NR_ZONES; i++)
+		zones_size[i] = 0;
+
+#ifdef CONFIG_HIGHMEM
+	zones_size[ZONE_HIGHMEM] = (total_memory - total_lowmem) >> PAGE_SHIFT;
+#endif /* CONFIG_HIGHMEM */
+
+	free_area_init(zones_size);
+}
+
+void __init mem_init(void)
+{
+	unsigned long addr;
+	int codepages = 0;
+	int datapages = 0;
+	int initpages = 0;
+#ifdef CONFIG_HIGHMEM
+	unsigned long highmem_mapnr;
+
+	highmem_mapnr = total_lowmem >> PAGE_SHIFT;
+#endif /* CONFIG_HIGHMEM */
+	max_mapnr = total_memory >> PAGE_SHIFT;
+
+	high_memory = (void *) __va(PPC_MEMSTART + total_lowmem);
+	num_physpages = max_mapnr;	/* RAM is assumed contiguous */
+
+	totalram_pages += free_all_bootmem();
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	/* if we are booted from BootX with an initial ramdisk,
+	   make sure the ramdisk pages aren't reserved. */
+	if (initrd_start) {
+		for (addr = initrd_start; addr < initrd_end; addr += PAGE_SIZE)
+			ClearPageReserved(virt_to_page(addr));
+	}
+#endif /* CONFIG_BLK_DEV_INITRD */
+
+#ifdef CONFIG_PPC_OF
+	/* mark the RTAS pages as reserved */
+	if ( rtas_data )
+		for (addr = (ulong)__va(rtas_data);
+		     addr < PAGE_ALIGN((ulong)__va(rtas_data)+rtas_size) ;
+		     addr += PAGE_SIZE)
+			SetPageReserved(virt_to_page(addr));
+#endif
+#ifdef CONFIG_PPC_PMAC
+	if (agp_special_page)
+		SetPageReserved(virt_to_page(agp_special_page));
+#endif
+	if ( sysmap )
+		for (addr = (unsigned long)sysmap;
+		     addr < PAGE_ALIGN((unsigned long)sysmap+sysmap_size) ;
+		     addr += PAGE_SIZE)
+			SetPageReserved(virt_to_page(addr));
+
+	for (addr = PAGE_OFFSET; addr < (unsigned long)high_memory;
+	     addr += PAGE_SIZE) {
+		if (!PageReserved(virt_to_page(addr)))
+			continue;
+		if (addr < (ulong) etext)
+			codepages++;
+		else if (addr >= (unsigned long)&__init_begin
+			 && addr < (unsigned long)&__init_end)
+			initpages++;
+		else if (addr < (ulong) klimit)
+			datapages++;
+	}
+
+#ifdef CONFIG_HIGHMEM
+	{
+		unsigned long pfn;
+
+		for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
+			struct page *page = mem_map + pfn;
+
+			ClearPageReserved(page);
+			set_bit(PG_highmem, &page->flags);
+			set_page_count(page, 1);
+			__free_page(page);
+			totalhigh_pages++;
+		}
+		totalram_pages += totalhigh_pages;
+	}
+#endif /* CONFIG_HIGHMEM */
+
+        printk("Memory: %luk available (%dk kernel code, %dk data, %dk init, %ldk highmem)\n",
+	       (unsigned long)nr_free_pages()<< (PAGE_SHIFT-10),
+	       codepages<< (PAGE_SHIFT-10), datapages<< (PAGE_SHIFT-10),
+	       initpages<< (PAGE_SHIFT-10),
+	       (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
+	if (sysmap)
+		printk("System.map loaded at 0x%08x for debugger, size: %ld bytes\n",
+			(unsigned int)sysmap, sysmap_size);
+#ifdef CONFIG_PPC_PMAC
+	if (agp_special_page)
+		printk(KERN_INFO "AGP special page: 0x%08lx\n", agp_special_page);
+#endif
+
+	mem_init_done = 1;
+}
+
+/*
+ * Set phys_avail to the amount of physical memory,
+ * less the kernel text/data/bss.
+ */
+void __init
+set_phys_avail(unsigned long total_memory)
+{
+	unsigned long kstart, ksize;
+
+	/*
+	 * Initially, available physical memory is equivalent to all
+	 * physical memory.
+	 */
+
+	phys_avail.regions[0].address = PPC_MEMSTART;
+	phys_avail.regions[0].size = total_memory;
+	phys_avail.n_regions = 1;
+
+	/*
+	 * Map out the kernel text/data/bss from the available physical
+	 * memory.
+	 */
+
+	kstart = __pa(_stext);	/* should be 0 */
+	ksize = PAGE_ALIGN(klimit - _stext);
+
+	mem_pieces_remove(&phys_avail, kstart, ksize, 0);
+	mem_pieces_remove(&phys_avail, 0, 0x4000, 0);
+
+#if defined(CONFIG_BLK_DEV_INITRD)
+	/* Remove the init RAM disk from the available memory. */
+	if (initrd_start) {
+		mem_pieces_remove(&phys_avail, __pa(initrd_start),
+				  initrd_end - initrd_start, 1);
+	}
+#endif /* CONFIG_BLK_DEV_INITRD */
+#ifdef CONFIG_PPC_OF
+	/* remove the RTAS pages from the available memory */
+	if (rtas_data)
+		mem_pieces_remove(&phys_avail, rtas_data, rtas_size, 1);
+#endif
+	/* remove the sysmap pages from the available memory */
+	if (sysmap)
+		mem_pieces_remove(&phys_avail, __pa(sysmap), sysmap_size, 1);
+#ifdef CONFIG_PPC_PMAC
+	/* Because of some uninorth weirdness, we need a page of
+	 * memory as high as possible (it must be outside of the
+	 * bus address seen as the AGP aperture). It will be used
+	 * by the r128 DRM driver
+	 *
+	 * FIXME: We need to make sure that page doesn't overlap any of the\
+	 * above. This could be done by improving mem_pieces_find to be able
+	 * to do a backward search from the end of the list.
+	 */
+	if (_machine == _MACH_Pmac && find_devices("uni-north-agp")) {
+		agp_special_page = (total_memory - PAGE_SIZE);
+		mem_pieces_remove(&phys_avail, agp_special_page, PAGE_SIZE, 0);
+		agp_special_page = (unsigned long)__va(agp_special_page);
+	}
+#endif /* CONFIG_PPC_PMAC */
+}
+
+/* Mark some memory as reserved by removing it from phys_avail. */
+void __init reserve_phys_mem(unsigned long start, unsigned long size)
+{
+	mem_pieces_remove(&phys_avail, start, size, 1);
+}
+
+/*
+ * This is called when a page has been modified by the kernel.
+ * It just marks the page as not i-cache clean.  We do the i-cache
+ * flush later when the page is given to a user process, if necessary.
+ */
+void flush_dcache_page(struct page *page)
+{
+	clear_bit(PG_arch_1, &page->flags);
+}
+
+void flush_dcache_icache_page(struct page *page)
+{
+#ifdef CONFIG_BOOKE
+	__flush_dcache_icache(kmap(page));
+	kunmap(page);
+#else
+	__flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
+#endif
+
+}
+void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
+{
+	clear_page(page);
+	clear_bit(PG_arch_1, &pg->flags);
+}
+
+void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
+		    struct page *pg)
+{
+	copy_page(vto, vfrom);
+	clear_bit(PG_arch_1, &pg->flags);
+}
+
+void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
+			     unsigned long addr, int len)
+{
+	unsigned long maddr;
+
+	maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
+	flush_icache_range(maddr, maddr + len);
+	kunmap(page);
+}
+
+/*
+ * This is called at the end of handling a user page fault, when the
+ * fault has been handled by updating a PTE in the linux page tables.
+ * We use it to preload an HPTE into the hash table corresponding to
+ * the updated linux PTE.
+ */
+void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
+		      pte_t pte)
+{
+	/* handle i-cache coherency */
+	unsigned long pfn = pte_pfn(pte);
+
+	if (pfn_valid(pfn)) {
+		struct page *page = pfn_to_page(pfn);
+		if (!PageReserved(page)
+		    && !test_bit(PG_arch_1, &page->flags)) {
+			if (vma->vm_mm == current->active_mm)
+				__flush_dcache_icache((void *) address);
+			else
+				flush_dcache_icache_page(page);
+			set_bit(PG_arch_1, &page->flags);
+		}
+	}
+
+#ifdef CONFIG_PPC_STD_MMU
+	/* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
+	if (Hash != 0 && pte_young(pte)) {
+		struct mm_struct *mm;
+		pmd_t *pmd;
+
+		mm = (address < TASK_SIZE)? vma->vm_mm: &init_mm;
+		pmd = pmd_offset(pgd_offset(mm, address), address);
+		if (!pmd_none(*pmd))
+			add_hash_page(mm->context, address, pmd_val(*pmd));
+	}
+#endif
+}
+
+/*
+ * This is called by /dev/mem to know if a given address has to
+ * be mapped non-cacheable or not
+ */
+int page_is_ram(unsigned long pfn)
+{
+	unsigned long paddr = (pfn << PAGE_SHIFT);
+
+	return paddr < __pa(high_memory);
+}
+
+pgprot_t phys_mem_access_prot(struct file *file, unsigned long addr,
+			      unsigned long size, pgprot_t vma_prot)
+{
+	if (ppc_md.phys_mem_access_prot)
+		return ppc_md.phys_mem_access_prot(file, addr, size, vma_prot);
+
+	if (!page_is_ram(addr >> PAGE_SHIFT))
+		vma_prot = __pgprot(pgprot_val(vma_prot)
+				    | _PAGE_GUARDED | _PAGE_NO_CACHE);
+	return vma_prot;
+}
+EXPORT_SYMBOL(phys_mem_access_prot);