diff options
Diffstat (limited to 'kernel/arch/x86/mm/pgtable_32.c')
-rw-r--r-- | kernel/arch/x86/mm/pgtable_32.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/kernel/arch/x86/mm/pgtable_32.c b/kernel/arch/x86/mm/pgtable_32.c new file mode 100644 index 000000000..75cc0978d --- /dev/null +++ b/kernel/arch/x86/mm/pgtable_32.c @@ -0,0 +1,98 @@ +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/mm.h> +#include <linux/nmi.h> +#include <linux/swap.h> +#include <linux/smp.h> +#include <linux/highmem.h> +#include <linux/pagemap.h> +#include <linux/spinlock.h> +#include <linux/module.h> + +#include <asm/pgtable.h> +#include <asm/pgalloc.h> +#include <asm/fixmap.h> +#include <asm/e820.h> +#include <asm/tlb.h> +#include <asm/tlbflush.h> +#include <asm/io.h> + +unsigned int __VMALLOC_RESERVE = 128 << 20; + +/* + * Associate a virtual page frame with a given physical page frame + * and protection flags for that frame. + */ +void set_pte_vaddr(unsigned long vaddr, pte_t pteval) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + + pgd = swapper_pg_dir + pgd_index(vaddr); + if (pgd_none(*pgd)) { + BUG(); + return; + } + pud = pud_offset(pgd, vaddr); + if (pud_none(*pud)) { + BUG(); + return; + } + pmd = pmd_offset(pud, vaddr); + if (pmd_none(*pmd)) { + BUG(); + return; + } + pte = pte_offset_kernel(pmd, vaddr); + if (pte_val(pteval)) + set_pte_at(&init_mm, vaddr, pte, pteval); + else + pte_clear(&init_mm, vaddr, pte); + + /* + * It's enough to flush this one mapping. + * (PGE mappings get flushed as well) + */ + __flush_tlb_one(vaddr); +} + +unsigned long __FIXADDR_TOP = 0xfffff000; +EXPORT_SYMBOL(__FIXADDR_TOP); + +/* + * vmalloc=size forces the vmalloc area to be exactly 'size' + * bytes. This can be used to increase (or decrease) the + * vmalloc area - the default is 128m. + */ +static int __init parse_vmalloc(char *arg) +{ + if (!arg) + return -EINVAL; + + /* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/ + __VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET; + return 0; +} +early_param("vmalloc", parse_vmalloc); + +/* + * reservetop=size reserves a hole at the top of the kernel address space which + * a hypervisor can load into later. Needed for dynamically loaded hypervisors, + * so relocating the fixmap can be done before paging initialization. + */ +static int __init parse_reservetop(char *arg) +{ + unsigned long address; + + if (!arg) + return -EINVAL; + + address = memparse(arg, &arg); + reserve_top_address(address); + early_ioremap_init(); + return 0; +} +early_param("reservetop", parse_reservetop); |