| /* | |
| * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) | |
| * Licensed under the GPL | |
| */ | |
| #include "linux/mm.h" | |
| #include "asm/page.h" | |
| #include "asm/pgalloc.h" | |
| #include "asm/tlbflush.h" | |
| #include "choose-mode.h" | |
| #include "mode_kern.h" | |
| #include "user_util.h" | |
| #include "tlb.h" | |
| #include "mem.h" | |
| #include "mem_user.h" | |
| #include "os.h" | |
| static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len, | |
| int r, int w, int x, struct host_vm_op *ops, int *index, | |
| int last_filled, union mm_context *mmu, void **flush, | |
| int (*do_ops)(union mm_context *, struct host_vm_op *, | |
| int, int, void **)) | |
| { | |
| __u64 offset; | |
| struct host_vm_op *last; | |
| int fd, ret = 0; | |
| fd = phys_mapping(phys, &offset); | |
| if(*index != -1){ | |
| last = &ops[*index]; | |
| if((last->type == MMAP) && | |
| (last->u.mmap.addr + last->u.mmap.len == virt) && | |
| (last->u.mmap.r == r) && (last->u.mmap.w == w) && | |
| (last->u.mmap.x == x) && (last->u.mmap.fd == fd) && | |
| (last->u.mmap.offset + last->u.mmap.len == offset)){ | |
| last->u.mmap.len += len; | |
| return 0; | |
| } | |
| } | |
| if(*index == last_filled){ | |
| ret = (*do_ops)(mmu, ops, last_filled, 0, flush); | |
| *index = -1; | |
| } | |
| ops[++*index] = ((struct host_vm_op) { .type = MMAP, | |
| .u = { .mmap = { | |
| .addr = virt, | |
| .len = len, | |
| .r = r, | |
| .w = w, | |
| .x = x, | |
| .fd = fd, | |
| .offset = offset } | |
| } }); | |
| return ret; | |
| } | |
| static int add_munmap(unsigned long addr, unsigned long len, | |
| struct host_vm_op *ops, int *index, int last_filled, | |
| union mm_context *mmu, void **flush, | |
| int (*do_ops)(union mm_context *, struct host_vm_op *, | |
| int, int, void **)) | |
| { | |
| struct host_vm_op *last; | |
| int ret = 0; | |
| if(*index != -1){ | |
| last = &ops[*index]; | |
| if((last->type == MUNMAP) && | |
| (last->u.munmap.addr + last->u.mmap.len == addr)){ | |
| last->u.munmap.len += len; | |
| return 0; | |
| } | |
| } | |
| if(*index == last_filled){ | |
| ret = (*do_ops)(mmu, ops, last_filled, 0, flush); | |
| *index = -1; | |
| } | |
| ops[++*index] = ((struct host_vm_op) { .type = MUNMAP, | |
| .u = { .munmap = { | |
| .addr = addr, | |
| .len = len } } }); | |
| return ret; | |
| } | |
| static int add_mprotect(unsigned long addr, unsigned long len, int r, int w, | |
| int x, struct host_vm_op *ops, int *index, | |
| int last_filled, union mm_context *mmu, void **flush, | |
| int (*do_ops)(union mm_context *, struct host_vm_op *, | |
| int, int, void **)) | |
| { | |
| struct host_vm_op *last; | |
| int ret = 0; | |
| if(*index != -1){ | |
| last = &ops[*index]; | |
| if((last->type == MPROTECT) && | |
| (last->u.mprotect.addr + last->u.mprotect.len == addr) && | |
| (last->u.mprotect.r == r) && (last->u.mprotect.w == w) && | |
| (last->u.mprotect.x == x)){ | |
| last->u.mprotect.len += len; | |
| return 0; | |
| } | |
| } | |
| if(*index == last_filled){ | |
| ret = (*do_ops)(mmu, ops, last_filled, 0, flush); | |
| *index = -1; | |
| } | |
| ops[++*index] = ((struct host_vm_op) { .type = MPROTECT, | |
| .u = { .mprotect = { | |
| .addr = addr, | |
| .len = len, | |
| .r = r, | |
| .w = w, | |
| .x = x } } }); | |
| return ret; | |
| } | |
| #define ADD_ROUND(n, inc) (((n) + (inc)) & ~((inc) - 1)) | |
| void fix_range_common(struct mm_struct *mm, unsigned long start_addr, | |
| unsigned long end_addr, int force, | |
| int (*do_ops)(union mm_context *, struct host_vm_op *, | |
| int, int, void **)) | |
| { | |
| pgd_t *npgd; | |
| pud_t *npud; | |
| pmd_t *npmd; | |
| pte_t *npte; | |
| union mm_context *mmu = &mm->context; | |
| unsigned long addr, end; | |
| int r, w, x; | |
| struct host_vm_op ops[1]; | |
| void *flush = NULL; | |
| int op_index = -1, last_op = sizeof(ops) / sizeof(ops[0]) - 1; | |
| int ret = 0; | |
| if(mm == NULL) return; | |
| ops[0].type = NONE; | |
| for(addr = start_addr; addr < end_addr && !ret;){ | |
| npgd = pgd_offset(mm, addr); | |
| if(!pgd_present(*npgd)){ | |
| end = ADD_ROUND(addr, PGDIR_SIZE); | |
| if(end > end_addr) | |
| end = end_addr; | |
| if(force || pgd_newpage(*npgd)){ | |
| ret = add_munmap(addr, end - addr, ops, | |
| &op_index, last_op, mmu, | |
| &flush, do_ops); | |
| pgd_mkuptodate(*npgd); | |
| } | |
| addr = end; | |
| continue; | |
| } | |
| npud = pud_offset(npgd, addr); | |
| if(!pud_present(*npud)){ | |
| end = ADD_ROUND(addr, PUD_SIZE); | |
| if(end > end_addr) | |
| end = end_addr; | |
| if(force || pud_newpage(*npud)){ | |
| ret = add_munmap(addr, end - addr, ops, | |
| &op_index, last_op, mmu, | |
| &flush, do_ops); | |
| pud_mkuptodate(*npud); | |
| } | |
| addr = end; | |
| continue; | |
| } | |
| npmd = pmd_offset(npud, addr); | |
| if(!pmd_present(*npmd)){ | |
| end = ADD_ROUND(addr, PMD_SIZE); | |
| if(end > end_addr) | |
| end = end_addr; | |
| if(force || pmd_newpage(*npmd)){ | |
| ret = add_munmap(addr, end - addr, ops, | |
| &op_index, last_op, mmu, | |
| &flush, do_ops); | |
| pmd_mkuptodate(*npmd); | |
| } | |
| addr = end; | |
| continue; | |
| } | |
| npte = pte_offset_kernel(npmd, addr); | |
| r = pte_read(*npte); | |
| w = pte_write(*npte); | |
| x = pte_exec(*npte); | |
| if (!pte_young(*npte)) { | |
| r = 0; | |
| w = 0; | |
| } else if (!pte_dirty(*npte)) { | |
| w = 0; | |
| } | |
| if(force || pte_newpage(*npte)){ | |
| if(pte_present(*npte)) | |
| ret = add_mmap(addr, | |
| pte_val(*npte) & PAGE_MASK, | |
| PAGE_SIZE, r, w, x, ops, | |
| &op_index, last_op, mmu, | |
| &flush, do_ops); | |
| else ret = add_munmap(addr, PAGE_SIZE, ops, | |
| &op_index, last_op, mmu, | |
| &flush, do_ops); | |
| } | |
| else if(pte_newprot(*npte)) | |
| ret = add_mprotect(addr, PAGE_SIZE, r, w, x, ops, | |
| &op_index, last_op, mmu, | |
| &flush, do_ops); | |
| *npte = pte_mkuptodate(*npte); | |
| addr += PAGE_SIZE; | |
| } | |
| if(!ret) | |
| ret = (*do_ops)(mmu, ops, op_index, 1, &flush); | |
| /* This is not an else because ret is modified above */ | |
| if(ret) { | |
| printk("fix_range_common: failed, killing current process\n"); | |
| force_sig(SIGKILL, current); | |
| } | |
| } | |
| int flush_tlb_kernel_range_common(unsigned long start, unsigned long end) | |
| { | |
| struct mm_struct *mm; | |
| pgd_t *pgd; | |
| pud_t *pud; | |
| pmd_t *pmd; | |
| pte_t *pte; | |
| unsigned long addr, last; | |
| int updated = 0, err; | |
| mm = &init_mm; | |
| for(addr = start; addr < end;){ | |
| pgd = pgd_offset(mm, addr); | |
| if(!pgd_present(*pgd)){ | |
| last = ADD_ROUND(addr, PGDIR_SIZE); | |
| if(last > end) | |
| last = end; | |
| if(pgd_newpage(*pgd)){ | |
| updated = 1; | |
| err = os_unmap_memory((void *) addr, | |
| last - addr); | |
| if(err < 0) | |
| panic("munmap failed, errno = %d\n", | |
| -err); | |
| } | |
| addr = last; | |
| continue; | |
| } | |
| pud = pud_offset(pgd, addr); | |
| if(!pud_present(*pud)){ | |
| last = ADD_ROUND(addr, PUD_SIZE); | |
| if(last > end) | |
| last = end; | |
| if(pud_newpage(*pud)){ | |
| updated = 1; | |
| err = os_unmap_memory((void *) addr, | |
| last - addr); | |
| if(err < 0) | |
| panic("munmap failed, errno = %d\n", | |
| -err); | |
| } | |
| addr = last; | |
| continue; | |
| } | |
| pmd = pmd_offset(pud, addr); | |
| if(!pmd_present(*pmd)){ | |
| last = ADD_ROUND(addr, PMD_SIZE); | |
| if(last > end) | |
| last = end; | |
| if(pmd_newpage(*pmd)){ | |
| updated = 1; | |
| err = os_unmap_memory((void *) addr, | |
| last - addr); | |
| if(err < 0) | |
| panic("munmap failed, errno = %d\n", | |
| -err); | |
| } | |
| addr = last; | |
| continue; | |
| } | |
| pte = pte_offset_kernel(pmd, addr); | |
| if(!pte_present(*pte) || pte_newpage(*pte)){ | |
| updated = 1; | |
| err = os_unmap_memory((void *) addr, | |
| PAGE_SIZE); | |
| if(err < 0) | |
| panic("munmap failed, errno = %d\n", | |
| -err); | |
| if(pte_present(*pte)) | |
| map_memory(addr, | |
| pte_val(*pte) & PAGE_MASK, | |
| PAGE_SIZE, 1, 1, 1); | |
| } | |
| else if(pte_newprot(*pte)){ | |
| updated = 1; | |
| os_protect_memory((void *) addr, PAGE_SIZE, 1, 1, 1); | |
| } | |
| addr += PAGE_SIZE; | |
| } | |
| return(updated); | |
| } | |
| pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address) | |
| { | |
| return(pgd_offset(mm, address)); | |
| } | |
| pud_t *pud_offset_proc(pgd_t *pgd, unsigned long address) | |
| { | |
| return(pud_offset(pgd, address)); | |
| } | |
| pmd_t *pmd_offset_proc(pud_t *pud, unsigned long address) | |
| { | |
| return(pmd_offset(pud, address)); | |
| } | |
| pte_t *pte_offset_proc(pmd_t *pmd, unsigned long address) | |
| { | |
| return(pte_offset_kernel(pmd, address)); | |
| } | |
| pte_t *addr_pte(struct task_struct *task, unsigned long addr) | |
| { | |
| pgd_t *pgd = pgd_offset(task->mm, addr); | |
| pud_t *pud = pud_offset(pgd, addr); | |
| pmd_t *pmd = pmd_offset(pud, addr); | |
| return(pte_offset_map(pmd, addr)); | |
| } | |
| void flush_tlb_page(struct vm_area_struct *vma, unsigned long address) | |
| { | |
| address &= PAGE_MASK; | |
| flush_tlb_range(vma, address, address + PAGE_SIZE); | |
| } | |
| void flush_tlb_all(void) | |
| { | |
| flush_tlb_mm(current->mm); | |
| } | |
| void flush_tlb_kernel_range(unsigned long start, unsigned long end) | |
| { | |
| CHOOSE_MODE_PROC(flush_tlb_kernel_range_tt, | |
| flush_tlb_kernel_range_common, start, end); | |
| } | |
| void flush_tlb_kernel_vm(void) | |
| { | |
| CHOOSE_MODE(flush_tlb_kernel_vm_tt(), | |
| flush_tlb_kernel_range_common(start_vm, end_vm)); | |
| } | |
| void __flush_tlb_one(unsigned long addr) | |
| { | |
| CHOOSE_MODE_PROC(__flush_tlb_one_tt, __flush_tlb_one_skas, addr); | |
| } | |
| void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, | |
| unsigned long end) | |
| { | |
| CHOOSE_MODE_PROC(flush_tlb_range_tt, flush_tlb_range_skas, vma, start, | |
| end); | |
| } | |
| void flush_tlb_mm(struct mm_struct *mm) | |
| { | |
| CHOOSE_MODE_PROC(flush_tlb_mm_tt, flush_tlb_mm_skas, mm); | |
| } | |
| void force_flush_all(void) | |
| { | |
| CHOOSE_MODE(force_flush_all_tt(), force_flush_all_skas()); | |
| } | |