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, 382 insertions, 0 deletions

diff --git a/arch/alpha/mm/init.c b/arch/alpha/mm/init.c
new file mode 100644
index 000000000000..90752f6d8867
--- /dev/null
+++ b/arch/alpha/mm/init.c
@@ -0,0 +1,382 @@
+/*
+ *  linux/arch/alpha/mm/init.c
+ *
+ *  Copyright (C) 1995  Linus Torvalds
+ */
+
+/* 2.3.x zone allocator, 1999 Andrea Arcangeli <andrea@suse.de> */
+
+#include <linux/config.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/init.h>
+#include <linux/bootmem.h> /* max_low_pfn */
+#include <linux/vmalloc.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/hwrpb.h>
+#include <asm/dma.h>
+#include <asm/mmu_context.h>
+#include <asm/console.h>
+#include <asm/tlb.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+extern void die_if_kernel(char *,struct pt_regs *,long);
+
+static struct pcb_struct original_pcb;
+
+pgd_t *
+pgd_alloc(struct mm_struct *mm)
+{
+        pgd_t *ret, *init;
+
+        ret = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
+        init = pgd_offset(&init_mm, 0UL);
+        if (ret) {
+#ifdef CONFIG_ALPHA_LARGE_VMALLOC
+                memcpy (ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
+                        (PTRS_PER_PGD - USER_PTRS_PER_PGD - 1)*sizeof(pgd_t));
+#else
+                pgd_val(ret[PTRS_PER_PGD-2]) = pgd_val(init[PTRS_PER_PGD-2]);
+#endif
+
+                /* The last PGD entry is the VPTB self-map.  */
+                pgd_val(ret[PTRS_PER_PGD-1])
+                  = pte_val(mk_pte(virt_to_page(ret), PAGE_KERNEL));
+        }
+        return ret;
+}
+
+pte_t *
+pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
+{
+        pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
+        return pte;
+}
+
+
+/*
+ * BAD_PAGE is the page that is used for page faults when linux
+ * is out-of-memory. Older versions of linux just did a
+ * do_exit(), but using this instead means there is less risk
+ * for a process dying in kernel mode, possibly leaving an inode
+ * unused etc..
+ *
+ * BAD_PAGETABLE is the accompanying page-table: it is initialized
+ * to point to BAD_PAGE entries.
+ *
+ * ZERO_PAGE is a special page that is used for zero-initialized
+ * data and COW.
+ */
+pmd_t *
+__bad_pagetable(void)
+{
+        memset((void *) EMPTY_PGT, 0, PAGE_SIZE);
+        return (pmd_t *) EMPTY_PGT;
+}
+
+pte_t
+__bad_page(void)
+{
+        memset((void *) EMPTY_PGE, 0, PAGE_SIZE);
+        return pte_mkdirty(mk_pte(virt_to_page(EMPTY_PGE), PAGE_SHARED));
+}
+
+#ifndef CONFIG_DISCONTIGMEM
+void
+show_mem(void)
+{
+        long i,free = 0,total = 0,reserved = 0;
+        long shared = 0, cached = 0;
+
+        printk("\nMem-info:\n");
+        show_free_areas();
+        printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
+        i = max_mapnr;
+        while (i-- > 0) {
+                total++;
+                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("%ld pages of RAM\n",total);
+        printk("%ld free pages\n",free);
+        printk("%ld reserved pages\n",reserved);
+        printk("%ld pages shared\n",shared);
+        printk("%ld pages swap cached\n",cached);
+}
+#endif
+
+static inline unsigned long
+load_PCB(struct pcb_struct *pcb)
+{
+        register unsigned long sp __asm__("$30");
+        pcb->ksp = sp;
+        return __reload_thread(pcb);
+}
+
+/* Set up initial PCB, VPTB, and other such nicities.  */
+
+static inline void
+switch_to_system_map(void)
+{
+        unsigned long newptbr;
+        unsigned long original_pcb_ptr;
+
+        /* Initialize the kernel's page tables.  Linux puts the vptb in
+           the last slot of the L1 page table.  */
+        memset(swapper_pg_dir, 0, PAGE_SIZE);
+        newptbr = ((unsigned long) swapper_pg_dir - PAGE_OFFSET) >> PAGE_SHIFT;
+        pgd_val(swapper_pg_dir[1023]) =
+                (newptbr << 32) | pgprot_val(PAGE_KERNEL);
+
+        /* Set the vptb.  This is often done by the bootloader, but 
+           shouldn't be required.  */
+        if (hwrpb->vptb != 0xfffffffe00000000UL) {
+                wrvptptr(0xfffffffe00000000UL);
+                hwrpb->vptb = 0xfffffffe00000000UL;
+                hwrpb_update_checksum(hwrpb);
+        }
+
+        /* Also set up the real kernel PCB while we're at it.  */
+        init_thread_info.pcb.ptbr = newptbr;
+        init_thread_info.pcb.flags = 1; /* set FEN, clear everything else */
+        original_pcb_ptr = load_PCB(&init_thread_info.pcb);
+        tbia();
+
+        /* Save off the contents of the original PCB so that we can
+           restore the original console's page tables for a clean reboot.
+
+           Note that the PCB is supposed to be a physical address, but
+           since KSEG values also happen to work, folks get confused.
+           Check this here.  */
+
+        if (original_pcb_ptr < PAGE_OFFSET) {
+                original_pcb_ptr = (unsigned long)
+                        phys_to_virt(original_pcb_ptr);
+        }
+        original_pcb = *(struct pcb_struct *) original_pcb_ptr;
+}
+
+int callback_init_done;
+
+void * __init
+callback_init(void * kernel_end)
+{
+        struct crb_struct * crb;
+        pgd_t *pgd;
+        pmd_t *pmd;
+        void *two_pages;
+
+        /* Starting at the HWRPB, locate the CRB. */
+        crb = (struct crb_struct *)((char *)hwrpb + hwrpb->crb_offset);
+
+        if (alpha_using_srm) {
+                /* Tell the console whither it is to be remapped. */
+                if (srm_fixup(VMALLOC_START, (unsigned long)hwrpb))
+                        __halt();               /* "We're boned."  --Bender */
+
+                /* Edit the procedure descriptors for DISPATCH and FIXUP. */
+                crb->dispatch_va = (struct procdesc_struct *)
+                        (VMALLOC_START + (unsigned long)crb->dispatch_va
+                         - crb->map[0].va);
+                crb->fixup_va = (struct procdesc_struct *)
+                        (VMALLOC_START + (unsigned long)crb->fixup_va
+                         - crb->map[0].va);
+        }
+
+        switch_to_system_map();
+
+        /* Allocate one PGD and one PMD.  In the case of SRM, we'll need
+           these to actually remap the console.  There is an assumption
+           here that only one of each is needed, and this allows for 8MB.
+           On systems with larger consoles, additional pages will be
+           allocated as needed during the mapping process.
+
+           In the case of not SRM, but not CONFIG_ALPHA_LARGE_VMALLOC,
+           we need to allocate the PGD we use for vmalloc before we start
+           forking other tasks.  */
+
+        two_pages = (void *)
+          (((unsigned long)kernel_end + ~PAGE_MASK) & PAGE_MASK);
+        kernel_end = two_pages + 2*PAGE_SIZE;
+        memset(two_pages, 0, 2*PAGE_SIZE);
+
+        pgd = pgd_offset_k(VMALLOC_START);
+        pgd_set(pgd, (pmd_t *)two_pages);
+        pmd = pmd_offset(pgd, VMALLOC_START);
+        pmd_set(pmd, (pte_t *)(two_pages + PAGE_SIZE));
+
+        if (alpha_using_srm) {
+                static struct vm_struct console_remap_vm;
+                unsigned long vaddr = VMALLOC_START;
+                unsigned long i, j;
+
+                /* Set up the third level PTEs and update the virtual
+                   addresses of the CRB entries.  */
+                for (i = 0; i < crb->map_entries; ++i) {
+                        unsigned long pfn = crb->map[i].pa >> PAGE_SHIFT;
+                        crb->map[i].va = vaddr;
+                        for (j = 0; j < crb->map[i].count; ++j) {
+                                /* Newer console's (especially on larger
+                                   systems) may require more pages of
+                                   PTEs. Grab additional pages as needed. */
+                                if (pmd != pmd_offset(pgd, vaddr)) {
+                                        memset(kernel_end, 0, PAGE_SIZE);
+                                        pmd = pmd_offset(pgd, vaddr);
+                                        pmd_set(pmd, (pte_t *)kernel_end);
+                                        kernel_end += PAGE_SIZE;
+                                }
+                                set_pte(pte_offset_kernel(pmd, vaddr),
+                                        pfn_pte(pfn, PAGE_KERNEL));
+                                pfn++;
+                                vaddr += PAGE_SIZE;
+                        }
+                }
+
+                /* Let vmalloc know that we've allocated some space.  */
+                console_remap_vm.flags = VM_ALLOC;
+                console_remap_vm.addr = (void *) VMALLOC_START;
+                console_remap_vm.size = vaddr - VMALLOC_START;
+                vmlist = &console_remap_vm;
+        }
+
+        callback_init_done = 1;
+        return kernel_end;
+}
+
+
+#ifndef CONFIG_DISCONTIGMEM
+/*
+ * paging_init() sets up the memory map.
+ */
+void
+paging_init(void)
+{
+        unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
+        unsigned long dma_pfn, high_pfn;
+
+        dma_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
+        high_pfn = max_pfn = max_low_pfn;
+
+        if (dma_pfn >= high_pfn)
+                zones_size[ZONE_DMA] = high_pfn;
+        else {
+                zones_size[ZONE_DMA] = dma_pfn;
+                zones_size[ZONE_NORMAL] = high_pfn - dma_pfn;
+        }
+
+        /* Initialize mem_map[].  */
+        free_area_init(zones_size);
+
+        /* Initialize the kernel's ZERO_PGE. */
+        memset((void *)ZERO_PGE, 0, PAGE_SIZE);
+}
+#endif /* CONFIG_DISCONTIGMEM */
+
+#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_SRM)
+void
+srm_paging_stop (void)
+{
+        /* Move the vptb back to where the SRM console expects it.  */
+        swapper_pg_dir[1] = swapper_pg_dir[1023];
+        tbia();
+        wrvptptr(0x200000000UL);
+        hwrpb->vptb = 0x200000000UL;
+        hwrpb_update_checksum(hwrpb);
+
+        /* Reload the page tables that the console had in use.  */
+        load_PCB(&original_pcb);
+        tbia();
+}
+#endif
+
+#ifndef CONFIG_DISCONTIGMEM
+static void __init
+printk_memory_info(void)
+{
+        unsigned long codesize, reservedpages, datasize, initsize, tmp;
+        extern int page_is_ram(unsigned long) __init;
+        extern char _text, _etext, _data, _edata;
+        extern char __init_begin, __init_end;
+
+        /* printk all informations */
+        reservedpages = 0;
+        for (tmp = 0; tmp < max_low_pfn; tmp++)
+                /*
+                 * Only count reserved RAM pages
+                 */
+                if (page_is_ram(tmp) && PageReserved(mem_map+tmp))
+                        reservedpages++;
+
+        codesize =  (unsigned long) &_etext - (unsigned long) &_text;
+        datasize =  (unsigned long) &_edata - (unsigned long) &_data;
+        initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
+
+        printk("Memory: %luk/%luk available (%luk kernel code, %luk reserved, %luk data, %luk init)\n",
+               (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
+               max_mapnr << (PAGE_SHIFT-10),
+               codesize >> 10,
+               reservedpages << (PAGE_SHIFT-10),
+               datasize >> 10,
+               initsize >> 10);
+}
+
+void __init
+mem_init(void)
+{
+        max_mapnr = num_physpages = max_low_pfn;
+        totalram_pages += free_all_bootmem();
+        high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
+
+        printk_memory_info();
+}
+#endif /* CONFIG_DISCONTIGMEM */
+
+void
+free_reserved_mem(void *start, void *end)
+{
+        void *__start = start;
+        for (; __start < end; __start += PAGE_SIZE) {
+                ClearPageReserved(virt_to_page(__start));
+                set_page_count(virt_to_page(__start), 1);
+                free_page((long)__start);
+                totalram_pages++;
+        }
+}
+
+void
+free_initmem(void)
+{
+        extern char __init_begin, __init_end;
+
+        free_reserved_mem(&__init_begin, &__init_end);
+        printk ("Freeing unused kernel memory: %ldk freed\n",
+                (&__init_end - &__init_begin) >> 10);
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void
+free_initrd_mem(unsigned long start, unsigned long end)
+{
+        free_reserved_mem((void *)start, (void *)end);
+        printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
+}
+#endif