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x86: arch/x86/mm/init_32.c cleanup

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Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar
2008-01-30 13:34:10 +01:00
parent 10f22dde55
commit 8550eb9982
3 changed files with 137 additions and 120 deletions
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130
arch/x86/mm/init_32.c
View File

@@ -39,6 +39,7 @@
#include <asm/fixmap.h>
#include <asm/e820.h>
#include <asm/apic.h>
#include <asm/bugs.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
#include <asm/pgalloc.h>
@@ -50,7 +51,7 @@ unsigned int __VMALLOC_RESERVE = 128 << 20;
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
unsigned long highstart_pfn, highend_pfn;
static int noinline do_test_wp_bit(void);
static noinline int do_test_wp_bit(void);
/*
* Creates a middle page table and puts a pointer to it in the
@@ -69,18 +70,18 @@ static pmd_t * __init one_md_table_init(pgd_t *pgd)
paravirt_alloc_pd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT);
set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
pud = pud_offset(pgd, 0);
if (pmd_table != pmd_offset(pud, 0))
BUG();
BUG_ON(pmd_table != pmd_offset(pud, 0));
}
#endif
pud = pud_offset(pgd, 0);
pmd_table = pmd_offset(pud, 0);
return pmd_table;
}
/*
* Create a page table and place a pointer to it in a middle page
* directory entry.
* directory entry:
*/
static pte_t * __init one_page_table_init(pmd_t *pmd)
{
@@ -90,9 +91,10 @@ static pte_t * __init one_page_table_init(pmd_t *pmd)
#ifdef CONFIG_DEBUG_PAGEALLOC
page_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
#endif
if (!page_table)
if (!page_table) {
page_table =
(pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
}
paravirt_alloc_pt(&init_mm, __pa(page_table) >> PAGE_SHIFT);
set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE));
@@ -106,19 +108,18 @@ static pte_t * __init one_page_table_init(pmd_t *pmd)
* This function initializes a certain range of kernel virtual memory
* with new bootmem page tables, everywhere page tables are missing in
* the given range.
*/
/*
*
* NOTE: The pagetables are allocated contiguous on the physical space
* so we can cache the place of the first one and move around without
* checking the pgd every time.
*/
static void __init page_table_range_init (unsigned long start, unsigned long end, pgd_t *pgd_base)
static void __init
page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base)
{
pgd_t *pgd;
pmd_t *pmd;
int pgd_idx, pmd_idx;
unsigned long vaddr;
pgd_t *pgd;
pmd_t *pmd;
vaddr = start;
pgd_idx = pgd_index(vaddr);
@@ -128,7 +129,8 @@ static void __init page_table_range_init (unsigned long start, unsigned long end
for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
pmd = one_md_table_init(pgd);
pmd = pmd + pmd_index(vaddr);
for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end); pmd++, pmd_idx++) {
for (; (pmd_idx < PTRS_PER_PMD) && (vaddr != end);
pmd++, pmd_idx++) {
one_page_table_init(pmd);
vaddr += PMD_SIZE;
@@ -147,15 +149,15 @@ static inline int is_kernel_text(unsigned long addr)
/*
* This maps the physical memory to kernel virtual address space, a total
* of max_low_pfn pages, by creating page tables starting from address
* PAGE_OFFSET.
* PAGE_OFFSET:
*/
static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
{
int pgd_idx, pmd_idx, pte_ofs;
unsigned long pfn;
pgd_t *pgd;
pmd_t *pmd;
pte_t *pte;
int pgd_idx, pmd_idx, pte_ofs;
pgd_idx = pgd_index(PAGE_OFFSET);
pgd = pgd_base + pgd_idx;
@@ -165,36 +167,40 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
pmd = one_md_table_init(pgd);
if (pfn >= max_low_pfn)
continue;
for (pmd_idx = 0;
pmd_idx < PTRS_PER_PMD && pfn < max_low_pfn;
pmd++, pmd_idx++) {
unsigned int address = pfn * PAGE_SIZE + PAGE_OFFSET;
unsigned int addr = pfn * PAGE_SIZE + PAGE_OFFSET;
/* Map with big pages if possible, otherwise
create normal page tables. */
/*
* Map with big pages if possible, otherwise
* create normal page tables:
*/
if (cpu_has_pse) {
unsigned int address2;
unsigned int addr2;
pgprot_t prot = PAGE_KERNEL_LARGE;
address2 = (pfn + PTRS_PER_PTE - 1) * PAGE_SIZE +
addr2 = (pfn + PTRS_PER_PTE-1) * PAGE_SIZE +
PAGE_OFFSET + PAGE_SIZE-1;
if (is_kernel_text(address) ||
is_kernel_text(address2))
if (is_kernel_text(addr) ||
is_kernel_text(addr2))
prot = PAGE_KERNEL_LARGE_EXEC;
set_pmd(pmd, pfn_pmd(pfn, prot));
pfn += PTRS_PER_PTE;
} else {
continue;
}
pte = one_page_table_init(pmd);
for (pte_ofs = 0;
pte_ofs < PTRS_PER_PTE && pfn < max_low_pfn;
pte++, pfn++, pte_ofs++, address += PAGE_SIZE) {
pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) {
pgprot_t prot = PAGE_KERNEL;
if (is_kernel_text(address))
if (is_kernel_text(addr))
prot = PAGE_KERNEL_EXEC;
set_pte(pte, pfn_pte(pfn, prot));
@@ -202,7 +208,6 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base)
}
}
}
}
static inline int page_kills_ppro(unsigned long pagenr)
{
@@ -215,14 +220,19 @@ static inline int page_kills_ppro(unsigned long pagenr)
pte_t *kmap_pte;
pgprot_t kmap_prot;
#define kmap_get_fixmap_pte(vaddr) \
pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), vaddr), (vaddr)), (vaddr))
static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr)
{
return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
vaddr), vaddr), vaddr);
}
static void __init kmap_init(void)
{
unsigned long kmap_vstart;
/* cache the first kmap pte */
/*
* Cache the first kmap pte:
*/
kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
@@ -231,11 +241,11 @@ static void __init kmap_init(void)
static void __init permanent_kmaps_init(pgd_t *pgd_base)
{
unsigned long vaddr;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
unsigned long vaddr;
vaddr = PKMAP_BASE;
page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
@@ -263,7 +273,8 @@ void __init add_one_highpage_init(struct page *page, int pfn, int bad_ppro)
SetPageReserved(page);
}
static int __meminit add_one_highpage_hotplug(struct page *page, unsigned long pfn)
static int __meminit
add_one_highpage_hotplug(struct page *page, unsigned long pfn)
{
free_new_highpage(page);
totalram_pages++;
@@ -271,6 +282,7 @@ static int __meminit add_one_highpage_hotplug(struct page *page, unsigned long p
max_mapnr = max(pfn, max_mapnr);
#endif
num_physpages++;
return 0;
}
@@ -278,7 +290,7 @@ static int __meminit add_one_highpage_hotplug(struct page *page, unsigned long p
* Not currently handling the NUMA case.
* Assuming single node and all memory that
* has been added dynamically that would be
* onlined here is in HIGHMEM
* onlined here is in HIGHMEM.
*/
void __meminit online_page(struct page *page)
{
@@ -286,13 +298,11 @@ void __meminit online_page(struct page *page)
add_one_highpage_hotplug(page, page_to_pfn(page));
}
#ifdef CONFIG_NUMA
extern void set_highmem_pages_init(int);
#else
#ifndef CONFIG_NUMA
static void __init set_highmem_pages_init(int bad_ppro)
{
int pfn;
for (pfn = highstart_pfn; pfn < highend_pfn; pfn++) {
/*
* Holes under sparsemem might not have no mem_map[]:
@@ -302,7 +312,7 @@ static void __init set_highmem_pages_init(int bad_ppro)
}
totalram_pages += totalhigh_pages;
}
#endif /* CONFIG_FLATMEM */
#endif /* !CONFIG_NUMA */
#else
# define kmap_init() do { } while (0)
@@ -312,13 +322,8 @@ static void __init set_highmem_pages_init(int bad_ppro)
pteval_t __PAGE_KERNEL = _PAGE_KERNEL;
EXPORT_SYMBOL(__PAGE_KERNEL);
pteval_t __PAGE_KERNEL_EXEC = _PAGE_KERNEL_EXEC;
#ifdef CONFIG_NUMA
extern void __init remap_numa_kva(void);
#else
#define remap_numa_kva() do {} while (0)
#endif
pteval_t __PAGE_KERNEL_EXEC = _PAGE_KERNEL_EXEC;
void __init native_pagetable_setup_start(pgd_t *base)
{
@@ -384,8 +389,8 @@ void __init native_pagetable_setup_done(pgd_t *base)
*/
static void __init pagetable_init(void)
{
unsigned long vaddr, end;
pgd_t *pgd_base = swapper_pg_dir;
unsigned long vaddr, end;
paravirt_pagetable_setup_start(pgd_base);
@@ -448,23 +453,24 @@ void zap_low_mappings (void)
* Note that "pgd_clear()" doesn't do it for
* us, because pgd_clear() is a no-op on i386.
*/
for (i = 0; i < USER_PTRS_PER_PGD; i++)
for (i = 0; i < USER_PTRS_PER_PGD; i++) {
#ifdef CONFIG_X86_PAE
set_pgd(swapper_pg_dir+i, __pgd(1 + __pa(empty_zero_page)));
#else
set_pgd(swapper_pg_dir+i, __pgd(0));
#endif
}
flush_tlb_all();
}
int nx_enabled = 0;
int nx_enabled;
pteval_t __supported_pte_mask __read_mostly = ~_PAGE_NX;
EXPORT_SYMBOL_GPL(__supported_pte_mask);
#ifdef CONFIG_X86_PAE
static int disable_nx __initdata = 0;
static int disable_nx __initdata;
/*
* noexec = on|off
@@ -481,11 +487,14 @@ static int __init noexec_setup(char *str)
__supported_pte_mask |= _PAGE_NX;
disable_nx = 0;
}
} else if (!strcmp(str,"off")) {
} else {
if (!strcmp(str, "off")) {
disable_nx = 1;
__supported_pte_mask &= ~_PAGE_NX;
} else
} else {
return -EINVAL;
}
}
return 0;
}
@@ -497,6 +506,7 @@ static void __init set_nx(void)
if (cpu_has_pae && (cpuid_eax(0x80000000) > 0x80000001)) {
cpuid(0x80000001, &v[0], &v[1], &v[2], &v[3]);
if ((v[3] & (1 << 20)) && !disable_nx) {
rdmsr(MSR_EFER, l, h);
l |= EFER_NX;
@@ -506,7 +516,6 @@ static void __init set_nx(void)
}
}
}
#endif
/*
@@ -523,7 +532,6 @@ void __init paging_init(void)
if (nx_enabled)
printk("NX (Execute Disable) protection: active\n");
#endif
pagetable_init();
load_cr3(swapper_pg_dir);
@@ -547,7 +555,6 @@ void __init paging_init(void)
* used to involve black magic jumps to work around some nasty CPU bugs,
* but fortunately the switch to using exceptions got rid of all that.
*/
static void __init test_wp_bit(void)
{
printk("Checking if this processor honours the WP bit even in supervisor mode... ");
@@ -571,15 +578,12 @@ static struct kcore_list kcore_mem, kcore_vmalloc;
void __init mem_init(void)
{
extern int ppro_with_ram_bug(void);
int codesize, reservedpages, datasize, initsize;
int tmp;
int bad_ppro;
int tmp, bad_ppro;
#ifdef CONFIG_FLATMEM
BUG_ON(!mem_map);
#endif
bad_ppro = ppro_with_ram_bug();
#ifdef CONFIG_HIGHMEM
@@ -591,14 +595,13 @@ void __init mem_init(void)
BUG();
}
#endif
/* this will put all low memory onto the freelists */
totalram_pages += free_all_bootmem();
reservedpages = 0;
for (tmp = 0; tmp < max_low_pfn; tmp++)
/*
* Only count reserved RAM pages
* Only count reserved RAM pages:
*/
if (page_is_ram(tmp) && PageReserved(pfn_to_page(tmp)))
reservedpages++;
@@ -613,7 +616,8 @@ void __init mem_init(void)
kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
VMALLOC_END-VMALLOC_START);
printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
"%dk reserved, %dk data, %dk init, %ldk highmem)\n",
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
num_physpages << (PAGE_SHIFT-10),
codesize >> 10,
@@ -649,7 +653,8 @@ void __init mem_init(void)
((unsigned long)high_memory - (unsigned long)__va(0)) >> 20,
(unsigned long)&__init_begin, (unsigned long)&__init_end,
((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10,
((unsigned long)&__init_end -
(unsigned long)&__init_begin) >> 10,
(unsigned long)&_etext, (unsigned long)&_edata,
((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
@@ -693,26 +698,26 @@ int arch_add_memory(int nid, u64 start, u64 size)
return __add_pages(zone, start_pfn, nr_pages);
}
#endif
struct kmem_cache *pmd_cache;
void __init pgtable_cache_init(void)
{
if (PTRS_PER_PMD > 1)
if (PTRS_PER_PMD > 1) {
pmd_cache = kmem_cache_create("pmd",
PTRS_PER_PMD*sizeof(pmd_t),
PTRS_PER_PMD*sizeof(pmd_t),
SLAB_PANIC,
pmd_ctor);
}
}
/*
* This function cannot be __init, since exceptions don't work in that
* section. Put this after the callers, so that it cannot be inlined.
*/
static int noinline do_test_wp_bit(void)
static noinline int do_test_wp_bit(void)
{
char tmp_reg;
int flag;
@@ -824,4 +829,3 @@ void free_initrd_mem(unsigned long start, unsigned long end)
free_init_pages("initrd memory", start, end);
}
#endif

3
include/asm-x86/bugs.h
View File

@@ -1,6 +1,7 @@
#ifndef _ASM_X86_BUGS_H
#define _ASM_X86_BUGS_H
void check_bugs(void);
extern void check_bugs(void);
extern int ppro_with_ram_bug(void);
#endif /* _ASM_X86_BUGS_H */

14
include/asm-x86/numa_32.h
View File

@@ -1,3 +1,15 @@
#ifndef _ASM_X86_32_NUMA_H
#define _ASM_X86_32_NUMA_H 1
int pxm_to_nid(int pxm);
extern int pxm_to_nid(int pxm);
#ifdef CONFIG_NUMA
extern void __init remap_numa_kva(void);
extern void set_highmem_pages_init(int);
#else
static inline void remap_numa_kva(void)
{
}
#endif
#endif /* _ASM_X86_32_NUMA_H */