/*
* 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;
}
/* 어린이를 위한 OLPC 찾기 */
void __init olpc_ofw_detect(void)
{
struct olpc_ofw_header *hdr = &boot_params.olpc_ofw_header;
unsigned long start;
/* ensure OFW booted us by checking for "OFW " string */
if (hdr->ofw_magic != OLPC_OFW_SIG)
return;
olpc_ofw_cif = (int (*)(int *))hdr->cif_handler;
if ((unsigned long)olpc_ofw_cif < OFW_MIN) {
printk(KERN_ERR "OFW detected, but cif has invalid address 0x%lx - disabling.\n",
(unsigned long)olpc_ofw_cif);
olpc_ofw_cif = NULL;
return;
}
/* determine where OFW starts in memory */
start = round_down((unsigned long)olpc_ofw_cif, OFW_BOUND);
printk(KERN_INFO "OFW detected in memory, cif @ 0x%lx (reserving top %ldMB)\n",
(unsigned long)olpc_ofw_cif, (-start) >> 20);
reserve_top_address(-start);
}
void __init xen_start_kernel(void)
{
unsigned int i;
struct xen_machphys_mapping mapping;
unsigned long machine_to_phys_nr_ents;
#ifdef CONFIG_X86_32
struct xen_platform_parameters pp;
extern pte_t swapper_pg_fixmap[PTRS_PER_PTE];
unsigned long addr;
#endif
xen_setup_features();
if (HYPERVISOR_memory_op(XENMEM_machphys_mapping, &mapping) == 0) {
machine_to_phys_mapping = (unsigned long *)mapping.v_start;
machine_to_phys_nr_ents = mapping.max_mfn + 1;
} else
machine_to_phys_nr_ents = MACH2PHYS_NR_ENTRIES;
while ((1UL << machine_to_phys_order) < machine_to_phys_nr_ents )
machine_to_phys_order++;
if (!xen_feature(XENFEAT_auto_translated_physmap))
phys_to_machine_mapping =
(unsigned long *)xen_start_info->mfn_list;
WARN_ON(HYPERVISOR_vm_assist(VMASST_CMD_enable,
VMASST_TYPE_writable_pagetables));
reserve_early(ALIGN(__pa_symbol(&_end), PAGE_SIZE),
__pa(xen_start_info->pt_base)
+ (xen_start_info->nr_pt_frames << PAGE_SHIFT),
"Xen provided");
#ifdef CONFIG_X86_32
WARN_ON(HYPERVISOR_vm_assist(VMASST_CMD_enable,
VMASST_TYPE_4gb_segments));
init_mm.pgd = swapper_pg_dir = (pgd_t *)xen_start_info->pt_base;
if (HYPERVISOR_xen_version(XENVER_platform_parameters, &pp) == 0) {
hypervisor_virt_start = pp.virt_start;
reserve_top_address(0UL - pp.virt_start);
}
BUG_ON(pte_index(hypervisor_virt_start));
/* Do an early initialization of the fixmap area */
make_lowmem_page_readonly(swapper_pg_fixmap, XENFEAT_writable_page_tables);
addr = __fix_to_virt(FIX_EARLYCON_MEM_BASE);
set_pmd(pmd_offset(pud_offset(swapper_pg_dir + pgd_index(addr),
addr),
addr),
__pmd(__pa_symbol(swapper_pg_fixmap) | _PAGE_TABLE));
#else
check_efer();
xen_init_pt();
#endif
#define __FIXADDR_TOP (-PAGE_SIZE)
#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
#define FIX_BUG_ON(fix) BUILD_BUG_ON(pmd_index(__fix_to_virt(FIX_##fix)) \
!= pmd_index(__fix_to_virt(FIX_EARLYCON_MEM_BASE)))
FIX_BUG_ON(SHARED_INFO);
FIX_BUG_ON(ISAMAP_BEGIN);
FIX_BUG_ON(ISAMAP_END);
#undef pmd_index
#undef __FIXADDR_TOP
/* Switch to the real shared_info page, and clear the dummy page. */
set_fixmap(FIX_SHARED_INFO, xen_start_info->shared_info);
HYPERVISOR_shared_info = (shared_info_t *)fix_to_virt(FIX_SHARED_INFO);
memset(empty_zero_page, 0, sizeof(empty_zero_page));
setup_vcpu_info(0);
/* Set up mapping of lowest 1MB of physical memory. */
for (i = 0; i < NR_FIX_ISAMAPS; i++)
if (is_initial_xendomain())
set_fixmap(FIX_ISAMAP_BEGIN - i, i * PAGE_SIZE);
else
__set_fixmap(FIX_ISAMAP_BEGIN - i,
virt_to_machine(empty_zero_page),
PAGE_KERNEL_RO);
}
