* Copyright (C) 1995 Linus Torvalds
*/
-#include <linux/config.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/bootmem.h>
+#include <linux/pfn.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/lowcore.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
+#include <asm/sections.h>
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
{
if (addr >= 0x7ff00000)
return;
+ asm volatile(
#ifdef CONFIG_64BIT
- asm volatile (
- " sam31\n"
- " diag %0,%0,0x10\n"
- "0: sam64\n"
- ".section __ex_table,\"a\"\n"
- " .align 8\n"
- " .quad 0b, 0b\n"
- ".previous\n"
- : : "a" (addr));
+ " sam31\n"
+ " diag %0,%0,0x10\n"
+ "0: sam64\n"
#else
- asm volatile (
- " diag %0,%0,0x10\n"
+ " diag %0,%0,0x10\n"
"0:\n"
- ".section __ex_table,\"a\"\n"
- " .align 4\n"
- " .long 0b, 0b\n"
- ".previous\n"
- : : "a" (addr));
#endif
+ EX_TABLE(0b,0b)
+ : : "a" (addr));
}
void show_mem(void)
printk("%d pages swap cached\n",cached);
}
-/* References to section boundaries */
-
-extern unsigned long _text;
-extern unsigned long _etext;
-extern unsigned long _edata;
-extern unsigned long __bss_start;
-extern unsigned long _end;
-
-extern unsigned long __init_begin;
-extern unsigned long __init_end;
-
extern unsigned long __initdata zholes_size[];
/*
* paging_init() sets up the page tables
unsigned long pfn = 0;
unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE;
static const int ssm_mask = 0x04000000L;
+ unsigned long ro_start_pfn, ro_end_pfn;
+ unsigned long zones_size[MAX_NR_ZONES];
+
+ ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata);
+ ro_end_pfn = PFN_UP((unsigned long)&__end_rodata);
+
+ memset(zones_size, 0, sizeof(zones_size));
+ zones_size[ZONE_DMA] = max_low_pfn;
+ free_area_init_node(0, &contig_page_data, zones_size,
+ __pa(PAGE_OFFSET) >> PAGE_SHIFT,
+ zholes_size);
/* unmap whole virtual address space */
pg_dir = swapper_pg_dir;
- for (i=0;i<KERNEL_PGD_PTRS;i++)
- pmd_clear((pmd_t*)pg_dir++);
+ for (i = 0; i < PTRS_PER_PGD; i++)
+ pmd_clear((pmd_t *) pg_dir++);
/*
* map whole physical memory to virtual memory (identity mapping)
/*
* pg_table is physical at this point
*/
- pg_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+ pg_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
- pg_dir->pgd0 = (_PAGE_TABLE | __pa(pg_table));
- pg_dir->pgd1 = (_PAGE_TABLE | (__pa(pg_table)+1024));
- pg_dir->pgd2 = (_PAGE_TABLE | (__pa(pg_table)+2048));
- pg_dir->pgd3 = (_PAGE_TABLE | (__pa(pg_table)+3072));
+ pmd_populate_kernel(&init_mm, (pmd_t *) pg_dir, pg_table);
pg_dir++;
for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) {
- pte = pfn_pte(pfn, PAGE_KERNEL);
+ if (pfn >= ro_start_pfn && pfn < ro_end_pfn)
+ pte = pfn_pte(pfn, __pgprot(_PAGE_RO));
+ else
+ pte = pfn_pte(pfn, PAGE_KERNEL);
if (pfn >= max_low_pfn)
- pte_clear(&init_mm, 0, &pte);
- set_pte(pg_table, pte);
+ pte_val(pte) = _PAGE_TYPE_EMPTY;
+ set_pte(pg_table, pte);
pfn++;
}
}
S390_lowcore.kernel_asce = pgdir_k;
/* enable virtual mapping in kernel mode */
- __asm__ __volatile__(" LCTL 1,1,%0\n"
- " LCTL 7,7,%0\n"
- " LCTL 13,13,%0\n"
- " SSM %1"
- : : "m" (pgdir_k), "m" (ssm_mask));
+ __ctl_load(pgdir_k, 1, 1);
+ __ctl_load(pgdir_k, 7, 7);
+ __ctl_load(pgdir_k, 13, 13);
+ __raw_local_irq_ssm(ssm_mask);
local_flush_tlb();
-
- {
- unsigned long zones_size[MAX_NR_ZONES];
-
- memset(zones_size, 0, sizeof(zones_size));
- zones_size[ZONE_DMA] = max_low_pfn;
- free_area_init_node(0, &contig_page_data, zones_size,
- __pa(PAGE_OFFSET) >> PAGE_SHIFT,
- zholes_size);
- }
return;
}
#else /* CONFIG_64BIT */
+
void __init paging_init(void)
{
pgd_t * pg_dir;
unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) |
_KERN_REGION_TABLE;
static const int ssm_mask = 0x04000000L;
-
unsigned long zones_size[MAX_NR_ZONES];
unsigned long dma_pfn, high_pfn;
+ unsigned long ro_start_pfn, ro_end_pfn;
memset(zones_size, 0, sizeof(zones_size));
dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
high_pfn = max_low_pfn;
+ ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata);
+ ro_end_pfn = PFN_UP((unsigned long)&__end_rodata);
if (dma_pfn > high_pfn)
zones_size[ZONE_DMA] = high_pfn;
continue;
}
- pm_dir = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE*4);
+ pm_dir = (pmd_t *) alloc_bootmem_pages(PAGE_SIZE * 4);
pgd_populate(&init_mm, pg_dir, pm_dir);
for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) {
continue;
}
- pt_dir = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+ pt_dir = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
pmd_populate_kernel(&init_mm, pm_dir, pt_dir);
for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) {
- pte = pfn_pte(pfn, PAGE_KERNEL);
- if (pfn >= max_low_pfn) {
- pte_clear(&init_mm, 0, &pte);
- continue;
- }
+ if (pfn >= ro_start_pfn && pfn < ro_end_pfn)
+ pte = pfn_pte(pfn, __pgprot(_PAGE_RO));
+ else
+ pte = pfn_pte(pfn, PAGE_KERNEL);
+ if (pfn >= max_low_pfn)
+ pte_val(pte) = _PAGE_TYPE_EMPTY;
set_pte(pt_dir, pte);
pfn++;
}
S390_lowcore.kernel_asce = pgdir_k;
/* enable virtual mapping in kernel mode */
- __asm__ __volatile__("lctlg 1,1,%0\n\t"
- "lctlg 7,7,%0\n\t"
- "lctlg 13,13,%0\n\t"
- "ssm %1"
- : :"m" (pgdir_k), "m" (ssm_mask));
+ __ctl_load(pgdir_k, 1, 1);
+ __ctl_load(pgdir_k, 7, 7);
+ __ctl_load(pgdir_k, 13, 13);
+ __raw_local_irq_ssm(ssm_mask);
local_flush_tlb();
reservedpages << (PAGE_SHIFT-10),
datasize >>10,
initsize >> 10);
+ printk("Write protected kernel read-only data: %#lx - %#lx\n",
+ (unsigned long)&__start_rodata,
+ PFN_ALIGN((unsigned long)&__end_rodata) - 1);
}
void free_initmem(void)
projects / linux-block.git / blobdiff