1 #include <linux/sched.h> 2 #include <linux/kernel.h> 3 #include <linux/errno.h> 4 #include <linux/mm.h> 5 #include <linux/nmi.h> 6 #include <linux/swap.h> 7 #include <linux/smp.h> 8 #include <linux/highmem.h> 9 #include <linux/pagemap.h> 10 #include <linux/spinlock.h> 11 12 #include <asm/pgtable.h> 13 #include <asm/pgalloc.h> 14 #include <asm/fixmap.h> 15 #include <asm/e820.h> 16 #include <asm/tlb.h> 17 #include <asm/tlbflush.h> 18 #include <asm/io.h> 19 20 unsigned int __VMALLOC_RESERVE = 128 << 20; 21 22 /* 23 * Associate a virtual page frame with a given physical page frame 24 * and protection flags for that frame. 25 */ 26 void set_pte_vaddr(unsigned long vaddr, pte_t pteval) 27 { 28 pgd_t *pgd; 29 pud_t *pud; 30 pmd_t *pmd; 31 pte_t *pte; 32 33 pgd = swapper_pg_dir + pgd_index(vaddr); 34 if (pgd_none(*pgd)) { 35 BUG(); 36 return; 37 } 38 pud = pud_offset(pgd, vaddr); 39 if (pud_none(*pud)) { 40 BUG(); 41 return; 42 } 43 pmd = pmd_offset(pud, vaddr); 44 if (pmd_none(*pmd)) { 45 BUG(); 46 return; 47 } 48 pte = pte_offset_kernel(pmd, vaddr); 49 if (!pte_none(pteval)) 50 set_pte_at(&init_mm, vaddr, pte, pteval); 51 else 52 pte_clear(&init_mm, vaddr, pte); 53 54 /* 55 * It's enough to flush this one mapping. 56 * (PGE mappings get flushed as well) 57 */ 58 __flush_tlb_one(vaddr); 59 } 60 61 unsigned long __FIXADDR_TOP = 0xfffff000; 62 EXPORT_SYMBOL(__FIXADDR_TOP); 63 64 /* 65 * vmalloc=size forces the vmalloc area to be exactly 'size' 66 * bytes. This can be used to increase (or decrease) the 67 * vmalloc area - the default is 128m. 68 */ 69 static int __init parse_vmalloc(char *arg) 70 { 71 if (!arg) 72 return -EINVAL; 73 74 /* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/ 75 __VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET; 76 return 0; 77 } 78 early_param("vmalloc", parse_vmalloc); 79 80 /* 81 * reservetop=size reserves a hole at the top of the kernel address space which 82 * a hypervisor can load into later. Needed for dynamically loaded hypervisors, 83 * so relocating the fixmap can be done before paging initialization. 84 */ 85 static int __init parse_reservetop(char *arg) 86 { 87 unsigned long address; 88 89 if (!arg) 90 return -EINVAL; 91 92 address = memparse(arg, &arg); 93 reserve_top_address(address); 94 early_ioremap_init(); 95 return 0; 96 } 97 early_param("reservetop", parse_reservetop); 98