diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/alpha/mm/init.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/alpha/mm/init.c | 349 |
1 files changed, 0 insertions, 349 deletions
diff --git a/ANDROID_3.4.5/arch/alpha/mm/init.c b/ANDROID_3.4.5/arch/alpha/mm/init.c deleted file mode 100644 index 1ad6ca74..00000000 --- a/ANDROID_3.4.5/arch/alpha/mm/init.c +++ /dev/null @@ -1,349 +0,0 @@ -/* - * linux/arch/alpha/mm/init.c - * - * Copyright (C) 1995 Linus Torvalds - */ - -/* 2.3.x zone allocator, 1999 Andrea Arcangeli <andrea@suse.de> */ - -#include <linux/pagemap.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 <linux/gfp.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> -#include <asm/setup.h> - -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; -} - - -/* - * 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)); -} - -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 nr_pages = 0; - unsigned long vaddr; - unsigned long i, j; - - /* calculate needed size */ - for (i = 0; i < crb->map_entries; ++i) - nr_pages += crb->map[i].count; - - /* register the vm area */ - console_remap_vm.flags = VM_ALLOC; - console_remap_vm.size = nr_pages << PAGE_SHIFT; - vm_area_register_early(&console_remap_vm, PAGE_SIZE); - - vaddr = (unsigned long)console_remap_vm.addr; - - /* 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 consoles (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; - } - } - } - - callback_init_done = 1; - return kernel_end; -} - - -#ifndef CONFIG_DISCONTIGMEM -/* - * paging_init() sets up the memory map. - */ -void __init paging_init(void) -{ - unsigned long zones_size[MAX_NR_ZONES] = {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", - 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)); - init_page_count(virt_to_page(__start)); - 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 |