* linux/arch/sh/mm/init.c
*
* Copyright (C) 1999 Niibe Yutaka
- * Copyright (C) 2002 Paul Mundt
+ * Copyright (C) 2002, 2004 Paul Mundt
*
* Based on linux/arch/i386/mm/init.c:
* Copyright (C) 1995 Linus Torvalds
*/
-#include <linux/config.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/highmem.h>
#include <linux/bootmem.h>
#include <linux/pagemap.h>
-
+#include <linux/proc_fs.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#define MAX_LOW_PFN (NODE_DATA(0)->bdata->node_low_pfn)
#endif
-#ifdef CONFIG_DISCONTIGMEM
-pg_data_t discontig_page_data[MAX_NUMNODES];
-bootmem_data_t discontig_node_bdata[MAX_NUMNODES];
-#endif
-
void (*copy_page)(void *from, void *to);
void (*clear_page)(void *to);
printk("Mem-info:\n");
show_free_areas();
- printk("Free swap: %6dkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
+ printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
i = max_mapnr;
while (i-- > 0) {
total++;
printk("%d pages swap cached\n",cached);
}
+#ifdef CONFIG_MMU
+static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+
+ pgd = pgd_offset_k(addr);
+ if (pgd_none(*pgd)) {
+ pgd_ERROR(*pgd);
+ return;
+ }
+
+ pud = pud_alloc(NULL, pgd, addr);
+ if (unlikely(!pud)) {
+ pud_ERROR(*pud);
+ return;
+ }
+
+ pmd = pmd_alloc(NULL, pud, addr);
+ if (unlikely(!pmd)) {
+ pmd_ERROR(*pmd);
+ return;
+ }
+
+ pte = pte_offset_kernel(pmd, addr);
+ if (!pte_none(*pte)) {
+ pte_ERROR(*pte);
+ return;
+ }
+
+ set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
+
+ __flush_tlb_page(get_asid(), addr);
+}
+
+/*
+ * As a performance optimization, other platforms preserve the fixmap mapping
+ * across a context switch, we don't presently do this, but this could be done
+ * in a similar fashion as to the wired TLB interface that sh64 uses (by way
+ * of the memorry mapped UTLB configuration) -- this unfortunately forces us to
+ * give up a TLB entry for each mapping we want to preserve. While this may be
+ * viable for a small number of fixmaps, it's not particularly useful for
+ * everything and needs to be carefully evaluated. (ie, we may want this for
+ * the vsyscall page).
+ *
+ * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
+ * in at __set_fixmap() time to determine the appropriate behavior to follow.
+ *
+ * -- PFM.
+ */
+void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
+{
+ unsigned long address = __fix_to_virt(idx);
+
+ if (idx >= __end_of_fixed_addresses) {
+ BUG();
+ return;
+ }
+
+ set_pte_phys(address, phys, prot);
+}
+#endif /* CONFIG_MMU */
+
/* References to section boundaries */
extern char _text, _etext, _edata, __bss_start, _end;
/*
* paging_init() sets up the page tables
- *
- * This routines also unmaps the page at virtual kernel address 0, so
- * that we can trap those pesky NULL-reference errors in the kernel.
*/
void __init paging_init(void)
{
*/
{
unsigned long max_dma, low, start_pfn;
- pgd_t *pg_dir;
- int i;
-
- /* We don't need kernel mapping as hardware support that. */
- pg_dir = swapper_pg_dir;
- for (i = 0; i < PTRS_PER_PGD; i++)
- pgd_val(pg_dir[i]) = 0;
+ /* We don't need to map the kernel through the TLB, as
+ * it is permanatly mapped using P1. So clear the
+ * entire pgd. */
+ memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
/* Turn on the MMU */
enable_mmu();
}
}
+ /* Set an initial value for the MMU.TTB so we don't have to
+ * check for a null value. */
+ set_TTB(swapper_pg_dir);
+
#elif defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4)
/*
* If we don't have CONFIG_MMU set and the processor in question
*/
disable_mmu();
#endif
-
- free_area_init_node(0, NODE_DATA(0), 0, zones_size, __MEMORY_START >> PAGE_SHIFT, 0);
- /* XXX: MRB-remove - this doesn't seem sane, should this be done somewhere else ?*/
- mem_map = NODE_DATA(0)->node_mem_map;
-
-#ifdef CONFIG_DISCONTIGMEM
- /*
- * And for discontig, do some more fixups on the zone sizes..
- */
- zones_size[ZONE_DMA] = __MEMORY_SIZE_2ND >> PAGE_SHIFT;
- zones_size[ZONE_NORMAL] = 0;
- free_area_init_node(1, NODE_DATA(1), 0, zones_size, __MEMORY_START_2ND >> PAGE_SHIFT, 0);
-#endif
+ NODE_DATA(0)->node_mem_map = NULL;
+ free_area_init_node(0, NODE_DATA(0), zones_size, __MEMORY_START >> PAGE_SHIFT, 0);
}
+static struct kcore_list kcore_mem, kcore_vmalloc;
+
void __init mem_init(void)
{
- extern unsigned long empty_zero_page[1024];
int codesize, reservedpages, datasize, initsize;
int tmp;
extern unsigned long memory_start;
memset(empty_zero_page, 0, PAGE_SIZE);
__flush_wback_region(empty_zero_page, PAGE_SIZE);
- /*
+ /*
* Setup wrappers for copy/clear_page(), these will get overridden
* later in the boot process if a better method is available.
*/
+#ifdef CONFIG_MMU
copy_page = copy_page_slow;
clear_page = clear_page_slow;
+#else
+ copy_page = copy_page_nommu;
+ clear_page = clear_page_nommu;
+#endif
/* this will put all low memory onto the freelists */
totalram_pages += free_all_bootmem_node(NODE_DATA(0));
-#ifdef CONFIG_DISCONTIGMEM
- totalram_pages += free_all_bootmem_node(NODE_DATA(1));
-#endif
reservedpages = 0;
for (tmp = 0; tmp < num_physpages; tmp++)
/*
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
- printk("Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n",
+ kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
+ 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)\n",
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
max_mapnr << (PAGE_SHIFT-10),
codesize >> 10,
initsize >> 10);
p3_cache_init();
+
+ /* Initialize the vDSO */
+ vsyscall_init();
}
void free_initmem(void)
{
unsigned long addr;
-
+
addr = (unsigned long)(&__init_begin);
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
- set_page_count(virt_to_page(addr), 1);
+ init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}
unsigned long p;
for (p = start; p < end; p += PAGE_SIZE) {
ClearPageReserved(virt_to_page(p));
- set_page_count(virt_to_page(p), 1);
+ init_page_count(virt_to_page(p));
free_page(p);
totalram_pages++;
}