diff options
Diffstat (limited to 'old/xenolinux-2.4.16-sparse/arch/xeno/mm/get_unmapped_area.c')
| -rw-r--r-- | old/xenolinux-2.4.16-sparse/arch/xeno/mm/get_unmapped_area.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/old/xenolinux-2.4.16-sparse/arch/xeno/mm/get_unmapped_area.c b/old/xenolinux-2.4.16-sparse/arch/xeno/mm/get_unmapped_area.c new file mode 100644 index 0000000000..a7b4447589 --- /dev/null +++ b/old/xenolinux-2.4.16-sparse/arch/xeno/mm/get_unmapped_area.c @@ -0,0 +1,137 @@ + +#include <linux/slab.h> +#include <linux/shm.h> +#include <linux/mman.h> +#include <linux/pagemap.h> +#include <linux/swap.h> +#include <linux/swapctl.h> +#include <linux/smp_lock.h> +#include <linux/init.h> +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/personality.h> + +#include <asm/uaccess.h> +#include <asm/pgalloc.h> + +/* +static int direct_mapped(unsigned long addr) +{ + direct_mmap_node_t * node; + struct list_head * curr; + struct list_head * direct_list = ¤t->mm->context.direct_list; + + curr = direct_list->next; + while(curr != direct_list){ + node = list_entry(curr, direct_mmap_node_t, list); + if(node->addr == addr) + break; + curr = curr->next; + } + + if(curr == direct_list) + return 0; + + return 1; +} +*/ +/* +unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) +{ + struct vm_area_struct *vma; + + if (len > TASK_SIZE) + return -ENOMEM; + + if (addr) { + addr = PAGE_ALIGN(addr); + vma = find_vma(current->mm, addr); + if (TASK_SIZE - len >= addr && + (!vma || addr + len <= vma->vm_start)) + return addr; + } + addr = PAGE_ALIGN(TASK_UNMAPPED_BASE); + + for (vma = find_vma(current->mm, addr); ; vma = vma->vm_next) { + if (TASK_SIZE - len < addr) + return -ENOMEM; + + if ((!vma || addr + len <= vma->vm_start) && !direct_mapped(addr)) + return addr; + + addr = vma->vm_end; + } +} +*/ +struct list_head *find_direct(struct list_head *list, unsigned long addr) +{ + struct list_head * curr; + struct list_head * direct_list = ¤t->mm->context.direct_list; + direct_mmap_node_t * node; + + for ( curr = direct_list->next; curr != direct_list; curr = curr->next ) + { + node = list_entry(curr, direct_mmap_node_t, list); + if ( node->vm_start >= addr ) break; + } + + return curr; +} + +unsigned long arch_get_unmapped_area(struct file *filp, unsigned long +addr, unsigned long len, unsigned long pgoff, unsigned long flags) +{ + struct vm_area_struct *vma; + direct_mmap_node_t * node; + struct list_head * curr; + struct list_head * direct_list = ¤t->mm->context.direct_list; + + if (len > TASK_SIZE) + return -ENOMEM; + + if ( addr ) + { + addr = PAGE_ALIGN(addr); + vma = find_vma(current->mm, addr); + curr = find_direct(direct_list, addr); + node = list_entry(curr, direct_mmap_node_t, list); + if ( (TASK_SIZE - len >= addr) && + (!vma || addr + len <= vma->vm_start) && + ((curr == direct_list) || addr + len <= node->vm_start) ) + return addr; + } + + addr = PAGE_ALIGN(TASK_UNMAPPED_BASE); + + + /* Find first VMA and direct_map nodes with vm_start > addr */ + vma = find_vma(current->mm, addr); + curr = find_direct(direct_list, addr); + node = list_entry(curr, direct_mmap_node_t, list); + + for ( ; ; ) + { + if ( TASK_SIZE - len < addr ) return -ENOMEM; + + if ( vma && ((curr == direct_list) || (vma->vm_start < node->vm_start))) + { + /* Do we fit before VMA node? */ + if ( addr + len <= vma->vm_start ) return addr; + addr = vma->vm_end; + vma = vma->vm_next; + } + else if ( curr != direct_list ) + { + /* Do we fit before direct_map node? */ + if ( addr + len <= node->vm_start) return addr; + addr = node->vm_end; + curr = curr->next; + node = list_entry(curr, direct_mmap_node_t, list); + } + else + { + /* !vma && curr == direct_list */ + return addr; + } + } +} |