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* linux/arch/sparc/mm/init.c
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#include <linux/config.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/head.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 <asm/system.h>
#include <asm/segment.h>
#include <asm/vac-ops.h>
#include <asm/page.h>
#include <asm/pgtable.h>
extern void scsi_mem_init(unsigned long);
extern void sound_mem_init(void);
extern void die_if_kernel(char *,struct pt_regs *,long);
extern void show_net_buffers(void);
extern int map_the_prom(int);
struct sparc_phys_banks sp_banks[14];
unsigned long *sun4c_mmu_table;
extern int invalid_segment, num_segmaps, num_contexts;
/*
* BAD_PAGE is the page that is used for page faults when linux
* is out-of-memory. Older versions of linux just did a
* do_exit(), but using this instead means there is less risk
* for a process dying in kernel mode, possibly leaving a inode
* unused etc..
*
* BAD_PAGETABLE is the accompanying page-table: it is initialized
* to point to BAD_PAGE entries.
*
* ZERO_PAGE is a special page that is used for zero-initialized
* data and COW.
*/
pte_t *__bad_pagetable(void)
{
memset((void *) EMPTY_PGT, 0, PAGE_SIZE);
return (pte_t *) EMPTY_PGT;
}
pte_t __bad_page(void)
{
memset((void *) EMPTY_PGE, 0, PAGE_SIZE);
return pte_mkdirty(mk_pte((unsigned long) EMPTY_PGE, PAGE_SHARED));
}
unsigned long __zero_page(void)
{
memset((void *) ZERO_PGE, 0, PAGE_SIZE);
return ZERO_PGE;
}
void show_mem(void)
{
int i,free = 0,total = 0,reserved = 0;
int shared = 0;
printk("Mem-info:\n");
show_free_areas();
printk("Free swap: %6dkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
i = high_memory >> PAGE_SHIFT;
while (i-- > 0) {
total++;
if (mem_map[i] & MAP_PAGE_RESERVED)
reserved++;
else if (!mem_map[i])
free++;
else
shared += mem_map[i]-1;
}
printk("%d pages of RAM\n",total);
printk("%d free pages\n",free);
printk("%d reserved pages\n",reserved);
printk("%d pages shared\n",shared);
show_buffers();
#ifdef CONFIG_NET
show_net_buffers();
#endif
}
extern unsigned long free_area_init(unsigned long, unsigned long);
/*
* paging_init() sets up the page tables: in the alpha version this actually
* unmaps the bootup page table (as we're now in KSEG, so we don't need it).
*
* The bootup sequence put the virtual page table into high memory: that
* means that we can change the L1 page table by just using VL1p below.
*/
unsigned long paging_init(unsigned long start_mem, unsigned long end_mem)
{
unsigned long i, a, b, mask=0;
unsigned long curseg, curpte, num_inval;
unsigned long address;
pte_t *pg_table;
register int num_segs, num_ctx;
register char * c;
num_segs = num_segmaps;
num_ctx = num_contexts;
num_segs -= 1;
invalid_segment = num_segs;
start_mem = free_area_init(start_mem, end_mem);
/* On the sparc we first need to allocate the segmaps for the
* PROM's virtual space, and make those segmaps unusable. We
* map the PROM in ALL contexts therefore the break key and the
* sync command work no matter what state you took the machine
* out of
*/
printk("mapping the prom...\n");
num_segs = map_the_prom(num_segs);
start_mem = PAGE_ALIGN(start_mem);
/* Set up static page tables in kernel space, this will be used
* so that the low-level page fault handler can fill in missing
* TLB entries since all mmu entries cannot be loaded at once
* on the sun4c.
*/
#if 0
/* ugly debugging code */
for(i=0; i<40960; i+=PAGE_SIZE)
printk("address=0x%x vseg=%d pte=0x%x\n", (unsigned int) i,
(int) get_segmap(i), (unsigned int) get_pte(i));
#endif
printk("Setting up kernel static mmu table... bounce bounce\n");
address = 0; /* ((unsigned long) &end) + 524288; */
sun4c_mmu_table = (unsigned long *) start_mem;
pg_table = (pte_t *) start_mem;
curseg = curpte = num_inval = 0;
while(address < end_mem) {
if(curpte == 0)
put_segmap((address&PGDIR_MASK), curseg);
for(i=0; sp_banks[i].num_bytes != 0; i++)
if((address >= sp_banks[i].base_addr) &&
(address <= (sp_banks[i].base_addr + sp_banks[i].num_bytes)))
goto good_address;
/* No physical memory here, so set the virtual segment to
* the invalid one, and put an invalid pte in the static
* kernel table.
*/
*pg_table = mk_pte((address >> PAGE_SHIFT), PAGE_INVALID);
pg_table++; curpte++; num_inval++;
if(curpte > 63) {
if(curpte == num_inval) {
put_segmap((address&PGDIR_MASK), invalid_segment);
} else {
put_segmap((address&PGDIR_MASK), curseg);
curseg++;
}
curpte = num_inval = 0;
}
address += PAGE_SIZE;
continue;
good_address:
/* create pte entry */
if(address < (((unsigned long) &end) + 524288)) {
pte_val(*pg_table) = get_pte(address);
} else {
*pg_table = mk_pte((address >> PAGE_SHIFT), PAGE_KERNEL);
put_pte(address, pte_val(*pg_table));
}
pg_table++; curpte++;
if(curpte > 63) {
put_segmap((address&PGDIR_MASK), curseg);
curpte = num_inval = 0;
curseg++;
}
address += PAGE_SIZE;
}
start_mem = (unsigned long) pg_table;
/* ok, allocate the kernel pages, map them in all contexts
* (with help from the prom), and lock them. Isn't the sparc
* fun kiddies? TODO
*/
#if 0
/* ugly debugging code */
for(i=0x1a3000; i<(0x1a3000+40960); i+=PAGE_SIZE)
printk("address=0x%x vseg=%d pte=0x%x\n", (unsigned int) i,
(int) get_segmap(i), (unsigned int) get_pte(i));
halt();
#endif
b=PGDIR_ALIGN(start_mem)>>18;
c= (char *)0x0;
printk("mapping kernel in all contexts...\n");
for(a=0; a<b; a++)
{
for(i=0; i<num_contexts; i++)
{
/* map the kernel virt_addrs */
(*(romvec->pv_setctxt))(i, (char *) c, a);
}
c += 0x40000;
}
/* Ok, since now mapped in all contexts, we can free up
* context zero to be used amongst user processes.
*/
/* free context 0 here TODO */
/* invalidate all user pages and initialize the pte struct
* for userland. TODO
*/
/* Make the kernel text unwritable and cacheable, the prom
* loaded our text as writable, only sneaky sunos kernels need
* self-modifying code.
*/
a= (unsigned long) &etext;
mask=~(PTE_NC|PTE_W); /* make cacheable + not writable */
/* must do for every segment since kernel uses all contexts
* and unlike some sun kernels I know of, we can't hard wire
* context 0 just for the kernel, that is unnecessary.
*/
for(i=0; i<8; i++)
{
b=PAGE_ALIGN((unsigned long) &trapbase);
switch_to_context(i);
for(;b<a; b+=4096)
{
put_pte(b, (get_pte(b) & mask));
}
}
invalidate(); /* flush the virtual address cache */
printk("\nCurrently in context - ");
for(i=0; i<num_contexts; i++)
{
switch_to_context(i);
printk("%d ", (int) i);
}
printk("\n");
switch_to_context(0);
invalidate();
return start_mem;
}
void mem_init(unsigned long start_mem, unsigned long end_mem)
{
unsigned long start_low_mem = PAGE_SIZE;
int codepages = 0;
int reservedpages = 0;
int datapages = 0;
int i = 0;
unsigned long tmp, limit, tmp2, addr;
extern char etext;
end_mem &= PAGE_MASK;
high_memory = end_mem;
start_low_mem = PAGE_ALIGN(start_low_mem);
start_mem = PAGE_ALIGN(start_mem);
for(i = 0; sp_banks[i].num_bytes != 0; i++) {
tmp = sp_banks[i].base_addr;
limit = (sp_banks[i].base_addr + sp_banks[i].num_bytes);
if(tmp<start_mem) {
if(limit>start_mem)
tmp = start_mem;
else continue;
}
while(tmp<limit) {
mem_map[MAP_NR(tmp)] = 0;
tmp += PAGE_SIZE;
}
if(sp_banks[i+1].num_bytes != 0)
while(tmp < sp_banks[i+1].base_addr) {
mem_map[MAP_NR(tmp)] = MAP_PAGE_RESERVED;
tmp += PAGE_SIZE;
}
}
#ifdef CONFIG_SCSI
scsi_mem_init(high_memory);
#endif
for (addr = 0; addr < high_memory; addr += PAGE_SIZE) {
if(mem_map[MAP_NR(addr)]) {
if (addr < (unsigned long) &etext)
codepages++;
else if(addr < start_mem)
datapages++;
else
reservedpages++;
continue;
}
mem_map[MAP_NR(addr)] = 1;
free_page(addr);
}
tmp2 = nr_free_pages << PAGE_SHIFT;
printk("Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data)\n",
tmp2 >> 10,
high_memory >> 10,
codepages << (PAGE_SHIFT-10),
reservedpages << (PAGE_SHIFT-10),
datapages << (PAGE_SHIFT-10));
invalidate();
return;
}
void si_meminfo(struct sysinfo *val)
{
int i;
i = high_memory >> PAGE_SHIFT;
val->totalram = 0;
val->sharedram = 0;
val->freeram = nr_free_pages << PAGE_SHIFT;
val->bufferram = buffermem;
while (i-- > 0) {
if (mem_map[i] & MAP_PAGE_RESERVED)
continue;
val->totalram++;
if (!mem_map[i])
continue;
val->sharedram += mem_map[i]-1;
}
val->totalram <<= PAGE_SHIFT;
val->sharedram <<= PAGE_SHIFT;
return;
}
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