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/*
* linux/arch/m68k/mm/sun3mmu.c
*
* Implementations of mm routines specific to the sun3 MMU.
*
* Moved here 8/20/1999 Sam Creasey
*
*/
#include <linux/config.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/init.h>
#ifdef CONFIG_BLK_DEV_RAM
#include <linux/blk.h>
#endif
#include <asm/setup.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/machdep.h>
#include <asm/io.h>
extern void mmu_emu_init (void);
extern unsigned long free_area_init(unsigned long, unsigned long);
const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
extern unsigned long empty_bad_page_table;
extern unsigned long empty_bad_page;
void free_initmem(void)
{
}
/* For the sun3 we try to follow the i386 paging_init() more closely */
/* start_mem and end_mem have PAGE_OFFSET added already */
/* now sets up tables using sun3 PTEs rather than i386 as before. --m */
unsigned long __init paging_init(unsigned long start_mem,
unsigned long end_mem)
{
pgd_t * pg_dir;
pte_t * pg_table;
int i;
unsigned long address;
#ifdef TEST_VERIFY_AREA
wp_works_ok = 0;
#endif
start_mem = PAGE_ALIGN(start_mem);
empty_bad_page_table = start_mem;
start_mem += PAGE_SIZE;
empty_bad_page = start_mem;
start_mem += PAGE_SIZE;
empty_zero_page = start_mem;
start_mem += PAGE_SIZE;
memset((void *)empty_zero_page, 0, PAGE_SIZE);
address = PAGE_OFFSET;
pg_dir = swapper_pg_dir;
memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir));
/* Map whole memory from PAGE_OFFSET (0x0E000000) */
pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
while (address < end_mem) {
pg_table = (pte_t *) __pa (start_mem);
start_mem += PTRS_PER_PTE * sizeof (pte_t);
pgd_val(*pg_dir) = (unsigned long) pg_table;
pg_dir++;
/* now change pg_table to kernel virtual addresses */
pg_table = (pte_t *) __va ((unsigned long) pg_table);
for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
pte_t pte = __mk_pte(address, PAGE_INIT);
if (address >= end_mem)
pte_val (pte) = 0;
set_pte (pg_table, pte);
address += PAGE_SIZE;
}
}
mmu_emu_init();
current->mm = NULL;
return PAGE_ALIGN(free_area_init(start_mem, end_mem));
}
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