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BSP 최초 추가
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#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/bootmem.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/blkdev.h> /* for initrd_* */
#include <linux/pagemap.h>
#include <linux/memblock.h>
#include <asm/segment.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/tlb.h>
#include <asm/mmu_context.h>
#include <asm/kmap_types.h>
#include <asm/fixmap.h>
#include <asm/tlbflush.h>
#include <asm/sections.h>
int mem_init_done;
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
static void __init zone_sizes_init(void)
{
unsigned long zones_size[MAX_NR_ZONES];
memset(zones_size, 0, sizeof(zones_size));
zones_size[ZONE_NORMAL] = max_low_pfn;
free_area_init(zones_size);
}
extern const char _s_kernel_ro[], _e_kernel_ro[];
static void __init map_ram(void)
{
unsigned long v, p, e;
pgprot_t prot;
pgd_t *pge;
pud_t *pue;
pmd_t *pme;
pte_t *pte;
struct memblock_region *region;
v = PAGE_OFFSET;
for_each_memblock(memory, region) {
p = (u32) region->base & PAGE_MASK;
e = p + (u32) region->size;
v = (u32) __va(p);
pge = pgd_offset_k(v);
while (p < e) {
int j;
pue = pud_offset(pge, v);
pme = pmd_offset(pue, v);
if ((u32) pue != (u32) pge || (u32) pme != (u32) pge) {
panic("%s: OR1K kernel hardcoded for "
"two-level page tables",
__func__);
}
pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
set_pmd(pme, __pmd(_KERNPG_TABLE + __pa(pte)));
for (j = 0; p < e && j < PTRS_PER_PGD;
v += PAGE_SIZE, p += PAGE_SIZE, j++, pte++) {
if (v >= (u32) _e_kernel_ro ||
v < (u32) _s_kernel_ro)
prot = PAGE_KERNEL;
else
prot = PAGE_KERNEL_RO;
set_pte(pte, mk_pte_phys(p, prot));
}
pge++;
}
printk(KERN_INFO "%s: Memory: 0x%x-0x%x
", __func__,
region->base, region->base + region->size);
}
}
void __init paging_init(void)
{
extern void tlb_init(void);
unsigned long end;
int i;
printk(KERN_INFO "Setting up paging and PTEs.
");
for (i = 0; i < PTRS_PER_PGD; i++)
swapper_pg_dir[i] = __pgd(0);
current_pgd = init_mm.pgd;
end = (unsigned long)__va(max_low_pfn * PAGE_SIZE);
map_ram();
zone_sizes_init();
{
extern unsigned long dtlb_miss_handler;
extern unsigned long itlb_miss_handler;
unsigned long *dtlb_vector = __va(0x900);
unsigned long *itlb_vector = __va(0xa00);
printk(KERN_INFO "itlb_miss_handler %p
", &itlb_miss_handler);
*itlb_vector = ((unsigned long)&itlb_miss_handler -
(unsigned long)itlb_vector) >> 2;
barrier();
printk(KERN_INFO "dtlb_miss_handler %p
", &dtlb_miss_handler);
*dtlb_vector = ((unsigned long)&dtlb_miss_handler -
(unsigned long)dtlb_vector) >> 2;
}
barrier();
mtspr(SPR_ICBIR, 0x900);
mtspr(SPR_ICBIR, 0xa00);
flush_tlb_all();
}
void __init mem_init(void)
{
BUG_ON(!mem_map);
max_mapnr = max_low_pfn;
high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
memset((void *)empty_zero_page, 0, PAGE_SIZE);
free_all_bootmem();
mem_init_print_info(NULL);
printk("mem_init_done ...........................................
");
mem_init_done = 1;
return;
}
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif
void free_initmem(void)
{
free_initmem_default(-1);
}
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