#include <linux/mman.h>
#include <linux/nodemask.h>
+#include <asm/cputype.h>
#include <asm/mach-types.h>
+#include <asm/sections.h>
+#include <asm/cachetype.h>
#include <asm/setup.h>
#include <asm/sizes.h>
#include <asm/tlb.h>
+#include <asm/highmem.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
-extern void _stext, _etext, __data_start, _end;
-extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
-
/*
* empty_zero_page is a special page that is used for
* zero-initialized data and COW.
*/
struct page *empty_zero_page;
+EXPORT_SYMBOL(empty_zero_page);
/*
* The pmd table for the upper-most set of pages.
.policy = "uncached",
.cr_mask = CR_W|CR_C,
.pmd = PMD_SECT_UNCACHED,
- .pte = 0,
+ .pte = L_PTE_MT_UNCACHED,
}, {
.policy = "buffered",
.cr_mask = CR_C,
.pmd = PMD_SECT_BUFFERED,
- .pte = PTE_BUFFERABLE,
+ .pte = L_PTE_MT_BUFFERABLE,
}, {
.policy = "writethrough",
.cr_mask = 0,
.pmd = PMD_SECT_WT,
- .pte = PTE_CACHEABLE,
+ .pte = L_PTE_MT_WRITETHROUGH,
}, {
.policy = "writeback",
.cr_mask = 0,
.pmd = PMD_SECT_WB,
- .pte = PTE_BUFFERABLE|PTE_CACHEABLE,
+ .pte = L_PTE_MT_WRITEBACK,
}, {
.policy = "writealloc",
.cr_mask = 0,
.pmd = PMD_SECT_WBWA,
- .pte = PTE_BUFFERABLE|PTE_CACHEABLE,
+ .pte = L_PTE_MT_WRITEALLOC,
}
};
#endif
#define PROT_PTE_DEVICE L_PTE_PRESENT|L_PTE_YOUNG|L_PTE_DIRTY|L_PTE_WRITE
-#define PROT_SECT_DEVICE PMD_TYPE_SECT|PMD_SECT_XN|PMD_SECT_AP_WRITE
+#define PROT_SECT_DEVICE PMD_TYPE_SECT|PMD_SECT_AP_WRITE
static struct mem_type mem_types[] = {
[MT_DEVICE] = { /* Strongly ordered / ARMv6 shared device */
- .prot_pte = PROT_PTE_DEVICE,
+ .prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_SHARED |
+ L_PTE_SHARED,
.prot_l1 = PMD_TYPE_TABLE,
- .prot_sect = PROT_SECT_DEVICE | PMD_SECT_UNCACHED,
+ .prot_sect = PROT_SECT_DEVICE | PMD_SECT_S,
.domain = DOMAIN_IO,
},
[MT_DEVICE_NONSHARED] = { /* ARMv6 non-shared device */
- .prot_pte = PROT_PTE_DEVICE,
- .prot_pte_ext = PTE_EXT_TEX(2),
+ .prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_NONSHARED,
.prot_l1 = PMD_TYPE_TABLE,
- .prot_sect = PROT_SECT_DEVICE | PMD_SECT_TEX(2),
+ .prot_sect = PROT_SECT_DEVICE,
.domain = DOMAIN_IO,
},
[MT_DEVICE_CACHED] = { /* ioremap_cached */
- .prot_pte = PROT_PTE_DEVICE | L_PTE_CACHEABLE | L_PTE_BUFFERABLE,
+ .prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_CACHED,
.prot_l1 = PMD_TYPE_TABLE,
.prot_sect = PROT_SECT_DEVICE | PMD_SECT_WB,
.domain = DOMAIN_IO,
},
- [MT_DEVICE_IXP2000] = { /* IXP2400 requires XCB=101 for on-chip I/O */
+ [MT_DEVICE_WC] = { /* ioremap_wc */
+ .prot_pte = PROT_PTE_DEVICE | L_PTE_MT_DEV_WC,
+ .prot_l1 = PMD_TYPE_TABLE,
+ .prot_sect = PROT_SECT_DEVICE,
+ .domain = DOMAIN_IO,
+ },
+ [MT_UNCACHED] = {
.prot_pte = PROT_PTE_DEVICE,
.prot_l1 = PMD_TYPE_TABLE,
- .prot_sect = PROT_SECT_DEVICE | PMD_SECT_BUFFERABLE |
- PMD_SECT_TEX(1),
+ .prot_sect = PMD_TYPE_SECT | PMD_SECT_XN,
.domain = DOMAIN_IO,
},
[MT_CACHECLEAN] = {
.prot_sect = PMD_TYPE_SECT,
.domain = DOMAIN_KERNEL,
},
+ [MT_MEMORY_NONCACHED] = {
+ .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE,
+ .domain = DOMAIN_KERNEL,
+ },
};
const struct mem_type *get_mem_type(unsigned int type)
{
return type < ARRAY_SIZE(mem_types) ? &mem_types[type] : NULL;
}
+EXPORT_SYMBOL(get_mem_type);
/*
* Adjust the PMD section entries according to the CPU in use.
{
struct cachepolicy *cp;
unsigned int cr = get_cr();
- unsigned int user_pgprot, kern_pgprot;
+ unsigned int user_pgprot, kern_pgprot, vecs_pgprot;
int cpu_arch = cpu_architecture();
int i;
cachepolicy = CPOLICY_WRITEBACK;
ecc_mask = 0;
}
+#ifdef CONFIG_SMP
+ cachepolicy = CPOLICY_WRITEALLOC;
+#endif
+
+ /*
+ * Strip out features not present on earlier architectures.
+ * Pre-ARMv5 CPUs don't have TEX bits. Pre-ARMv6 CPUs or those
+ * without extended page tables don't have the 'Shared' bit.
+ */
+ if (cpu_arch < CPU_ARCH_ARMv5)
+ for (i = 0; i < ARRAY_SIZE(mem_types); i++)
+ mem_types[i].prot_sect &= ~PMD_SECT_TEX(7);
+ if ((cpu_arch < CPU_ARCH_ARMv6 || !(cr & CR_XP)) && !cpu_is_xsc3())
+ for (i = 0; i < ARRAY_SIZE(mem_types); i++)
+ mem_types[i].prot_sect &= ~PMD_SECT_S;
/*
- * ARMv5 and lower, bit 4 must be set for page tables.
- * (was: cache "update-able on write" bit on ARM610)
- * However, Xscale cores require this bit to be cleared.
+ * ARMv5 and lower, bit 4 must be set for page tables (was: cache
+ * "update-able on write" bit on ARM610). However, Xscale and
+ * Xscale3 require this bit to be cleared.
*/
- if (cpu_is_xscale()) {
+ if (cpu_is_xscale() || cpu_is_xsc3()) {
for (i = 0; i < ARRAY_SIZE(mem_types); i++) {
mem_types[i].prot_sect &= ~PMD_BIT4;
mem_types[i].prot_l1 &= ~PMD_BIT4;
}
}
+ /*
+ * Mark the device areas according to the CPU/architecture.
+ */
+ if (cpu_is_xsc3() || (cpu_arch >= CPU_ARCH_ARMv6 && (cr & CR_XP))) {
+ if (!cpu_is_xsc3()) {
+ /*
+ * Mark device regions on ARMv6+ as execute-never
+ * to prevent speculative instruction fetches.
+ */
+ mem_types[MT_DEVICE].prot_sect |= PMD_SECT_XN;
+ mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_XN;
+ mem_types[MT_DEVICE_CACHED].prot_sect |= PMD_SECT_XN;
+ mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_XN;
+ }
+ if (cpu_arch >= CPU_ARCH_ARMv7 && (cr & CR_TRE)) {
+ /*
+ * For ARMv7 with TEX remapping,
+ * - shared device is SXCB=1100
+ * - nonshared device is SXCB=0100
+ * - write combine device mem is SXCB=0001
+ * (Uncached Normal memory)
+ */
+ mem_types[MT_DEVICE].prot_sect |= PMD_SECT_TEX(1);
+ mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(1);
+ mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_BUFFERABLE;
+ } else if (cpu_is_xsc3()) {
+ /*
+ * For Xscale3,
+ * - shared device is TEXCB=00101
+ * - nonshared device is TEXCB=01000
+ * - write combine device mem is TEXCB=00100
+ * (Inner/Outer Uncacheable in xsc3 parlance)
+ */
+ mem_types[MT_DEVICE].prot_sect |= PMD_SECT_TEX(1) | PMD_SECT_BUFFERED;
+ mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(2);
+ mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_TEX(1);
+ } else {
+ /*
+ * For ARMv6 and ARMv7 without TEX remapping,
+ * - shared device is TEXCB=00001
+ * - nonshared device is TEXCB=01000
+ * - write combine device mem is TEXCB=00100
+ * (Uncached Normal in ARMv6 parlance).
+ */
+ mem_types[MT_DEVICE].prot_sect |= PMD_SECT_BUFFERED;
+ mem_types[MT_DEVICE_NONSHARED].prot_sect |= PMD_SECT_TEX(2);
+ mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_TEX(1);
+ }
+ } else {
+ /*
+ * On others, write combining is "Uncached/Buffered"
+ */
+ mem_types[MT_DEVICE_WC].prot_sect |= PMD_SECT_BUFFERABLE;
+ }
+
+ /*
+ * Now deal with the memory-type mappings
+ */
cp = &cache_policies[cachepolicy];
- kern_pgprot = user_pgprot = cp->pte;
+ vecs_pgprot = kern_pgprot = user_pgprot = cp->pte;
+
+#ifndef CONFIG_SMP
+ /*
+ * Only use write-through for non-SMP systems
+ */
+ if (cpu_arch >= CPU_ARCH_ARMv5 && cachepolicy > CPOLICY_WRITETHROUGH)
+ vecs_pgprot = cache_policies[CPOLICY_WRITETHROUGH].pte;
+#endif
/*
* Enable CPU-specific coherency if supported.
* (Only available on XSC3 at the moment.)
*/
- if (arch_is_coherent()) {
- if (cpu_is_xsc3()) {
- mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
- mem_types[MT_MEMORY].prot_pte |= L_PTE_SHARED;
- }
- }
+ if (arch_is_coherent() && cpu_is_xsc3())
+ mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
/*
* ARMv6 and above have extended page tables.
mem_types[MT_MINICLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
mem_types[MT_CACHECLEAN].prot_sect |= PMD_SECT_APX|PMD_SECT_AP_WRITE;
- /*
- * Mark the device area as "shared device"
- */
- mem_types[MT_DEVICE].prot_pte |= L_PTE_BUFFERABLE;
- mem_types[MT_DEVICE].prot_sect |= PMD_SECT_BUFFERED;
-
#ifdef CONFIG_SMP
/*
* Mark memory with the "shared" attribute for SMP systems
*/
user_pgprot |= L_PTE_SHARED;
kern_pgprot |= L_PTE_SHARED;
+ vecs_pgprot |= L_PTE_SHARED;
mem_types[MT_MEMORY].prot_sect |= PMD_SECT_S;
+ mem_types[MT_MEMORY_NONCACHED].prot_sect |= PMD_SECT_S;
#endif
}
+ /*
+ * Non-cacheable Normal - intended for memory areas that must
+ * not cause dirty cache line writebacks when used
+ */
+ if (cpu_arch >= CPU_ARCH_ARMv6) {
+ if (cpu_arch >= CPU_ARCH_ARMv7 && (cr & CR_TRE)) {
+ /* Non-cacheable Normal is XCB = 001 */
+ mem_types[MT_MEMORY_NONCACHED].prot_sect |=
+ PMD_SECT_BUFFERED;
+ } else {
+ /* For both ARMv6 and non-TEX-remapping ARMv7 */
+ mem_types[MT_MEMORY_NONCACHED].prot_sect |=
+ PMD_SECT_TEX(1);
+ }
+ } else {
+ mem_types[MT_MEMORY_NONCACHED].prot_sect |= PMD_SECT_BUFFERABLE;
+ }
+
for (i = 0; i < 16; i++) {
unsigned long v = pgprot_val(protection_map[i]);
- v = (v & ~(L_PTE_BUFFERABLE|L_PTE_CACHEABLE)) | user_pgprot;
- protection_map[i] = __pgprot(v);
+ protection_map[i] = __pgprot(v | user_pgprot);
}
- mem_types[MT_LOW_VECTORS].prot_pte |= kern_pgprot;
- mem_types[MT_HIGH_VECTORS].prot_pte |= kern_pgprot;
-
- if (cpu_arch >= CPU_ARCH_ARMv5) {
-#ifndef CONFIG_SMP
- /*
- * Only use write-through for non-SMP systems
- */
- mem_types[MT_LOW_VECTORS].prot_pte &= ~L_PTE_BUFFERABLE;
- mem_types[MT_HIGH_VECTORS].prot_pte &= ~L_PTE_BUFFERABLE;
-#endif
- } else {
- mem_types[MT_MINICLEAN].prot_sect &= ~PMD_SECT_TEX(1);
- }
+ mem_types[MT_LOW_VECTORS].prot_pte |= vecs_pgprot;
+ mem_types[MT_HIGH_VECTORS].prot_pte |= vecs_pgprot;
pgprot_user = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG | user_pgprot);
pgprot_kernel = __pgprot(L_PTE_PRESENT | L_PTE_YOUNG |
pte = pte_offset_kernel(pmd, addr);
do {
- set_pte_ext(pte, pfn_pte(pfn, __pgprot(type->prot_pte)),
- type->prot_pte_ext);
+ set_pte_ext(pte, pfn_pte(pfn, __pgprot(type->prot_pte)), 0);
pfn++;
} while (pte++, addr += PAGE_SIZE, addr != end);
}
create_mapping(io_desc + i);
}
-static inline void prepare_page_table(struct meminfo *mi)
+static unsigned long __initdata vmalloc_reserve = SZ_128M;
+
+/*
+ * 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 void __init early_vmalloc(char **arg)
+{
+ vmalloc_reserve = memparse(*arg, arg);
+
+ if (vmalloc_reserve < SZ_16M) {
+ vmalloc_reserve = SZ_16M;
+ printk(KERN_WARNING
+ "vmalloc area too small, limiting to %luMB\n",
+ vmalloc_reserve >> 20);
+ }
+
+ if (vmalloc_reserve > VMALLOC_END - (PAGE_OFFSET + SZ_32M)) {
+ vmalloc_reserve = VMALLOC_END - (PAGE_OFFSET + SZ_32M);
+ printk(KERN_WARNING
+ "vmalloc area is too big, limiting to %luMB\n",
+ vmalloc_reserve >> 20);
+ }
+}
+__early_param("vmalloc=", early_vmalloc);
+
+#define VMALLOC_MIN (void *)(VMALLOC_END - vmalloc_reserve)
+
+static void __init sanity_check_meminfo(void)
+{
+ int i, j, highmem = 0;
+
+ for (i = 0, j = 0; i < meminfo.nr_banks; i++) {
+ struct membank *bank = &meminfo.bank[j];
+ *bank = meminfo.bank[i];
+
+#ifdef CONFIG_HIGHMEM
+ if (__va(bank->start) > VMALLOC_MIN ||
+ __va(bank->start) < (void *)PAGE_OFFSET)
+ highmem = 1;
+
+ bank->highmem = highmem;
+
+ /*
+ * Split those memory banks which are partially overlapping
+ * the vmalloc area greatly simplifying things later.
+ */
+ if (__va(bank->start) < VMALLOC_MIN &&
+ bank->size > VMALLOC_MIN - __va(bank->start)) {
+ if (meminfo.nr_banks >= NR_BANKS) {
+ printk(KERN_CRIT "NR_BANKS too low, "
+ "ignoring high memory\n");
+ } else if (cache_is_vipt_aliasing()) {
+ printk(KERN_CRIT "HIGHMEM is not yet supported "
+ "with VIPT aliasing cache, "
+ "ignoring high memory\n");
+ } else {
+ memmove(bank + 1, bank,
+ (meminfo.nr_banks - i) * sizeof(*bank));
+ meminfo.nr_banks++;
+ i++;
+ bank[1].size -= VMALLOC_MIN - __va(bank->start);
+ bank[1].start = __pa(VMALLOC_MIN - 1) + 1;
+ bank[1].highmem = highmem = 1;
+ j++;
+ }
+ bank->size = VMALLOC_MIN - __va(bank->start);
+ }
+#else
+ /*
+ * Check whether this memory bank would entirely overlap
+ * the vmalloc area.
+ */
+ if (__va(bank->start) >= VMALLOC_MIN ||
+ __va(bank->start) < (void *)PAGE_OFFSET) {
+ printk(KERN_NOTICE "Ignoring RAM at %.8lx-%.8lx "
+ "(vmalloc region overlap).\n",
+ bank->start, bank->start + bank->size - 1);
+ continue;
+ }
+
+ /*
+ * Check whether this memory bank would partially overlap
+ * the vmalloc area.
+ */
+ if (__va(bank->start + bank->size) > VMALLOC_MIN ||
+ __va(bank->start + bank->size) < __va(bank->start)) {
+ unsigned long newsize = VMALLOC_MIN - __va(bank->start);
+ printk(KERN_NOTICE "Truncating RAM at %.8lx-%.8lx "
+ "to -%.8lx (vmalloc region overlap).\n",
+ bank->start, bank->start + bank->size - 1,
+ bank->start + newsize - 1);
+ bank->size = newsize;
+ }
+#endif
+ j++;
+ }
+ meminfo.nr_banks = j;
+}
+
+static inline void prepare_page_table(void)
{
unsigned long addr;
/*
* Clear out all the mappings below the kernel image.
*/
- for (addr = 0; addr < MODULE_START; addr += PGDIR_SIZE)
+ for (addr = 0; addr < MODULES_VADDR; addr += PGDIR_SIZE)
pmd_clear(pmd_off_k(addr));
#ifdef CONFIG_XIP_KERNEL
/* The XIP kernel is mapped in the module area -- skip over it */
- addr = ((unsigned long)&_etext + PGDIR_SIZE - 1) & PGDIR_MASK;
+ addr = ((unsigned long)_etext + PGDIR_SIZE - 1) & PGDIR_MASK;
#endif
for ( ; addr < PAGE_OFFSET; addr += PGDIR_SIZE)
pmd_clear(pmd_off_k(addr));
* Clear out all the kernel space mappings, except for the first
* memory bank, up to the end of the vmalloc region.
*/
- for (addr = __phys_to_virt(mi->bank[0].start + mi->bank[0].size);
+ for (addr = __phys_to_virt(bank_phys_end(&meminfo.bank[0]));
addr < VMALLOC_END; addr += PGDIR_SIZE)
pmd_clear(pmd_off_k(addr));
}
* Note that this can only be in node 0.
*/
#ifdef CONFIG_XIP_KERNEL
- reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start);
+ reserve_bootmem_node(pgdat, __pa(_data), _end - _data,
+ BOOTMEM_DEFAULT);
#else
- reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext);
+ reserve_bootmem_node(pgdat, __pa(_stext), _end - _stext,
+ BOOTMEM_DEFAULT);
#endif
/*
* and can only be in node 0.
*/
reserve_bootmem_node(pgdat, __pa(swapper_pg_dir),
- PTRS_PER_PGD * sizeof(pgd_t));
+ PTRS_PER_PGD * sizeof(pgd_t), BOOTMEM_DEFAULT);
/*
* Hmm... This should go elsewhere, but we really really need to
/* H1940 and RX3715 need to reserve this for suspend */
if (machine_is_h1940() || machine_is_rx3715()) {
- reserve_bootmem_node(pgdat, 0x30003000, 0x1000);
- reserve_bootmem_node(pgdat, 0x30081000, 0x1000);
+ reserve_bootmem_node(pgdat, 0x30003000, 0x1000,
+ BOOTMEM_DEFAULT);
+ reserve_bootmem_node(pgdat, 0x30081000, 0x1000,
+ BOOTMEM_DEFAULT);
+ }
+
+ if (machine_is_palmld() || machine_is_palmtx()) {
+ reserve_bootmem_node(pgdat, 0xa0000000, 0x1000,
+ BOOTMEM_EXCLUSIVE);
+ reserve_bootmem_node(pgdat, 0xa0200000, 0x1000,
+ BOOTMEM_EXCLUSIVE);
+ }
+
+ if (machine_is_treo680()) {
+ reserve_bootmem_node(pgdat, 0xa0000000, 0x1000,
+ BOOTMEM_EXCLUSIVE);
+ reserve_bootmem_node(pgdat, 0xa2000000, 0x1000,
+ BOOTMEM_EXCLUSIVE);
+ }
+
+ if (machine_is_palmt5())
+ reserve_bootmem_node(pgdat, 0xa0200000, 0x1000,
+ BOOTMEM_EXCLUSIVE);
+
+ /*
+ * U300 - This platform family can share physical memory
+ * between two ARM cpus, one running Linux and the other
+ * running another OS.
+ */
+ if (machine_is_u300()) {
+#ifdef CONFIG_MACH_U300_SINGLE_RAM
+#if ((CONFIG_MACH_U300_ACCESS_MEM_SIZE & 1) == 1) && \
+ CONFIG_MACH_U300_2MB_ALIGNMENT_FIX
+ res_size = 0x00100000;
+#endif
+#endif
}
#ifdef CONFIG_SA1111
res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
#endif
if (res_size)
- reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size);
+ reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size,
+ BOOTMEM_DEFAULT);
}
/*
* Allocate the vector page early.
*/
vectors = alloc_bootmem_low_pages(PAGE_SIZE);
- BUG_ON(!vectors);
for (addr = VMALLOC_END; addr; addr += PGDIR_SIZE)
pmd_clear(pmd_off_k(addr));
*/
#ifdef CONFIG_XIP_KERNEL
map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK);
- map.virtual = MODULE_START;
- map.length = ((unsigned long)&_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK;
+ map.virtual = MODULES_VADDR;
+ map.length = ((unsigned long)_etext - map.virtual + ~SECTION_MASK) & SECTION_MASK;
map.type = MT_ROM;
create_mapping(&map);
#endif
flush_cache_all();
}
+static void __init kmap_init(void)
+{
+#ifdef CONFIG_HIGHMEM
+ pmd_t *pmd = pmd_off_k(PKMAP_BASE);
+ pte_t *pte = alloc_bootmem_low_pages(2 * PTRS_PER_PTE * sizeof(pte_t));
+ BUG_ON(!pmd_none(*pmd) || !pte);
+ __pmd_populate(pmd, __pa(pte) | _PAGE_KERNEL_TABLE);
+ pkmap_page_table = pte + PTRS_PER_PTE;
+#endif
+}
+
/*
* paging_init() sets up the page tables, initialises the zone memory
* maps, and sets up the zero page, bad page and bad page tables.
*/
-void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
+void __init paging_init(struct machine_desc *mdesc)
{
void *zero_page;
build_mem_type_table();
- prepare_page_table(mi);
- bootmem_init(mi);
+ sanity_check_meminfo();
+ prepare_page_table();
+ bootmem_init();
devicemaps_init(mdesc);
+ kmap_init();
top_pmd = pmd_off_k(0xffff0000);
/*
- * allocate the zero page. Note that we count on this going ok.
+ * allocate the zero page. Note that this always succeeds and
+ * returns a zeroed result.
*/
zero_page = alloc_bootmem_low_pages(PAGE_SIZE);
- memzero(zero_page, PAGE_SIZE);
empty_zero_page = virt_to_page(zero_page);
flush_dcache_page(empty_zero_page);
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff