97 lines
2.6 KiB
C
Executable file
97 lines
2.6 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/arch/m68k/mm/sun3mmu.c
|
|
*
|
|
* Implementations of mm routines specific to the sun3 MMU.
|
|
*
|
|
* Moved here 8/20/1999 Sam Creasey
|
|
*
|
|
*/
|
|
|
|
#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>
|
|
#include <linux/bootmem.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/io.h>
|
|
|
|
extern void mmu_emu_init (unsigned long bootmem_end);
|
|
|
|
const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
|
|
|
|
extern unsigned long num_pages;
|
|
|
|
/* 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 */
|
|
void __init paging_init(void)
|
|
{
|
|
pgd_t * pg_dir;
|
|
pte_t * pg_table;
|
|
int i;
|
|
unsigned long address;
|
|
unsigned long next_pgtable;
|
|
unsigned long bootmem_end;
|
|
unsigned long zones_size[MAX_NR_ZONES] = { 0, };
|
|
unsigned long size;
|
|
|
|
empty_zero_page = alloc_bootmem_pages(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));
|
|
|
|
size = num_pages * sizeof(pte_t);
|
|
size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
|
|
|
|
next_pgtable = (unsigned long)alloc_bootmem_pages(size);
|
|
bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
|
|
|
|
/* Map whole memory from PAGE_OFFSET (0x0E000000) */
|
|
pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
|
|
|
|
while (address < (unsigned long)high_memory) {
|
|
pg_table = (pte_t *) __pa (next_pgtable);
|
|
next_pgtable += 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 = pfn_pte(virt_to_pfn(address), PAGE_INIT);
|
|
if (address >= (unsigned long)high_memory)
|
|
pte_val (pte) = 0;
|
|
set_pte (pg_table, pte);
|
|
address += PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
mmu_emu_init(bootmem_end);
|
|
|
|
current->mm = NULL;
|
|
|
|
/* memory sizing is a hack stolen from motorola.c.. hope it works for us */
|
|
zones_size[ZONE_DMA] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;
|
|
|
|
/* I really wish I knew why the following change made things better... -- Sam */
|
|
/* free_area_init(zones_size); */
|
|
free_area_init_node(0, zones_size,
|
|
(__pa(PAGE_OFFSET) >> PAGE_SHIFT) + 1, NULL);
|
|
|
|
|
|
}
|
|
|
|
|