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android_kernel_motorola_sm6225/arch/sparc64/mm/init.c
David S. Miller c9c1083074 [SPARC64]: Fix boot failures on SunBlade-150 
The sequence to move over to the Linux trap tables from
the firmware ones needs to be more air tight.  It turns
out that to be %100 safe we do need to be able to translate
OBP mappings in our TLB miss handlers early.

In order not to eat up a lot of kernel image memory with
static page tables, just use the translations array in
the OBP TLB miss handlers.  That solves the bulk of the
problem.

Furthermore, to make sure the OBP TLB miss path will work
even before the fixed MMU globals are loaded, explicitly
load %g1 to TLB_SFSR at the beginning of the i-TLB and
d-TLB miss handlers.

To ease the OBP TLB miss walking of the prom_trans[] array,
we sort it then delete all of the non-OBP entries in there
(for example, there are entries for the kernel image itself
which we're not interested in at all).

We also save about 32K of kernel image size with this change.
Not a bad side effect :-)

There are still some reasons why trampoline.S can't use the
setup_trap_table() yet.  The most noteworthy are:

1) OBP boots secondary processors with non-bias'd stack for
   some reason.  This is easily fixed by using a small bootup
   stack in the kernel image explicitly for this purpose.

2) Doing a firmware call via the normal C call prom_set_trap_table()
   goes through the whole OBP enter/exit sequence that saves and
   restores OBP and Linux kernel state in the MMUs.  This path
   unfortunately does a "flush %g6" while loading up the OBP locked
   TLB entries for the firmware call.

   If we setup the %g6 in the trampoline.S code properly, that
   is in the PAGE_OFFSET linear mapping, but we're not on the
   kernel trap table yet so those addresses won't translate properly.

   One idea is to do a by-hand firmware call like we do in the
   early bootup code and elsewhere here in trampoline.S  But this
   fails as well, as aparently the secondary processors are not
   booted with OBP's special locked TLB entries loaded.  These
   are necessary for the firwmare to processes TLB misses correctly
   up until the point where we take over the trap table.

This does need to be resolved at some point.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-12 12:22:46 -07:00

1678 lines
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/* $Id: init.c,v 1.209 2002/02/09 19:49:31 davem Exp $
* arch/sparc64/mm/init.c
*
* Copyright (C) 1996-1999 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1997-1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <linux/slab.h>
#include <linux/initrd.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/kprobes.h>
#include <linux/cache.h>
#include <linux/sort.h>
#include <asm/head.h>
#include <asm/system.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/oplib.h>
#include <asm/iommu.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
#include <asm/dma.h>
#include <asm/starfire.h>
#include <asm/tlb.h>
#include <asm/spitfire.h>
#include <asm/sections.h>
extern void device_scan(void);
#define MAX_BANKS 32
static struct linux_prom64_registers pavail[MAX_BANKS] __initdata;
static struct linux_prom64_registers pavail_rescan[MAX_BANKS] __initdata;
static int pavail_ents __initdata;
static int pavail_rescan_ents __initdata;
static int cmp_p64(const void *a, const void *b)
{
const struct linux_prom64_registers *x = a, *y = b;
if (x->phys_addr > y->phys_addr)
return 1;
if (x->phys_addr < y->phys_addr)
return -1;
return 0;
}
static void __init read_obp_memory(const char *property,
struct linux_prom64_registers *regs,
int *num_ents)
{
int node = prom_finddevice("/memory");
int prop_size = prom_getproplen(node, property);
int ents, ret, i;
ents = prop_size / sizeof(struct linux_prom64_registers);
if (ents > MAX_BANKS) {
prom_printf("The machine has more %s property entries than "
"this kernel can support (%d).\n",
property, MAX_BANKS);
prom_halt();
}
ret = prom_getproperty(node, property, (char *) regs, prop_size);
if (ret == -1) {
prom_printf("Couldn't get %s property from /memory.\n");
prom_halt();
}
*num_ents = ents;
/* Sanitize what we got from the firmware, by page aligning
* everything.
*/
for (i = 0; i < ents; i++) {
unsigned long base, size;
base = regs[i].phys_addr;
size = regs[i].reg_size;
size &= PAGE_MASK;
if (base & ~PAGE_MASK) {
unsigned long new_base = PAGE_ALIGN(base);
size -= new_base - base;
if ((long) size < 0L)
size = 0UL;
base = new_base;
}
regs[i].phys_addr = base;
regs[i].reg_size = size;
}
sort(regs, ents, sizeof(struct linux_prom64_registers),
cmp_p64, NULL);
}
unsigned long *sparc64_valid_addr_bitmap __read_mostly;
/* Ugly, but necessary... -DaveM */
unsigned long phys_base __read_mostly;
unsigned long kern_base __read_mostly;
unsigned long kern_size __read_mostly;
unsigned long pfn_base __read_mostly;
/* get_new_mmu_context() uses "cache + 1". */
DEFINE_SPINLOCK(ctx_alloc_lock);
unsigned long tlb_context_cache = CTX_FIRST_VERSION - 1;
#define CTX_BMAP_SLOTS (1UL << (CTX_NR_BITS - 6))
unsigned long mmu_context_bmap[CTX_BMAP_SLOTS];
/* References to special section boundaries */
extern char _start[], _end[];
/* Initial ramdisk setup */
extern unsigned long sparc_ramdisk_image64;
extern unsigned int sparc_ramdisk_image;
extern unsigned int sparc_ramdisk_size;
struct page *mem_map_zero __read_mostly;
unsigned int sparc64_highest_unlocked_tlb_ent __read_mostly;
unsigned long sparc64_kern_pri_context __read_mostly;
unsigned long sparc64_kern_pri_nuc_bits __read_mostly;
unsigned long sparc64_kern_sec_context __read_mostly;
int bigkernel = 0;
/* XXX Tune this... */
#define PGT_CACHE_LOW 25
#define PGT_CACHE_HIGH 50
void check_pgt_cache(void)
{
preempt_disable();
if (pgtable_cache_size > PGT_CACHE_HIGH) {
do {
if (pgd_quicklist)
free_pgd_slow(get_pgd_fast());
if (pte_quicklist[0])
free_pte_slow(pte_alloc_one_fast(NULL, 0));
if (pte_quicklist[1])
free_pte_slow(pte_alloc_one_fast(NULL, 1 << (PAGE_SHIFT + 10)));
} while (pgtable_cache_size > PGT_CACHE_LOW);
}
preempt_enable();
}
#ifdef CONFIG_DEBUG_DCFLUSH
atomic_t dcpage_flushes = ATOMIC_INIT(0);
#ifdef CONFIG_SMP
atomic_t dcpage_flushes_xcall = ATOMIC_INIT(0);
#endif
#endif
__inline__ void flush_dcache_page_impl(struct page *page)
{
#ifdef CONFIG_DEBUG_DCFLUSH
atomic_inc(&dcpage_flushes);
#endif
#ifdef DCACHE_ALIASING_POSSIBLE
__flush_dcache_page(page_address(page),
((tlb_type == spitfire) &&
page_mapping(page) != NULL));
#else
if (page_mapping(page) != NULL &&
tlb_type == spitfire)
__flush_icache_page(__pa(page_address(page)));
#endif
}
#define PG_dcache_dirty PG_arch_1
#define PG_dcache_cpu_shift 24
#define PG_dcache_cpu_mask (256 - 1)
#if NR_CPUS > 256
#error D-cache dirty tracking and thread_info->cpu need fixing for > 256 cpus
#endif
#define dcache_dirty_cpu(page) \
(((page)->flags >> PG_dcache_cpu_shift) & PG_dcache_cpu_mask)
static __inline__ void set_dcache_dirty(struct page *page, int this_cpu)
{
unsigned long mask = this_cpu;
unsigned long non_cpu_bits;
non_cpu_bits = ~(PG_dcache_cpu_mask << PG_dcache_cpu_shift);
mask = (mask << PG_dcache_cpu_shift) | (1UL << PG_dcache_dirty);
__asm__ __volatile__("1:\n\t"
"ldx [%2], %%g7\n\t"
"and %%g7, %1, %%g1\n\t"
"or %%g1, %0, %%g1\n\t"
"casx [%2], %%g7, %%g1\n\t"
"cmp %%g7, %%g1\n\t"
"membar #StoreLoad | #StoreStore\n\t"
"bne,pn %%xcc, 1b\n\t"
" nop"
: /* no outputs */
: "r" (mask), "r" (non_cpu_bits), "r" (&page->flags)
: "g1", "g7");
}
static __inline__ void clear_dcache_dirty_cpu(struct page *page, unsigned long cpu)
{
unsigned long mask = (1UL << PG_dcache_dirty);
__asm__ __volatile__("! test_and_clear_dcache_dirty\n"
"1:\n\t"
"ldx [%2], %%g7\n\t"
"srlx %%g7, %4, %%g1\n\t"
"and %%g1, %3, %%g1\n\t"
"cmp %%g1, %0\n\t"
"bne,pn %%icc, 2f\n\t"
" andn %%g7, %1, %%g1\n\t"
"casx [%2], %%g7, %%g1\n\t"
"cmp %%g7, %%g1\n\t"
"membar #StoreLoad | #StoreStore\n\t"
"bne,pn %%xcc, 1b\n\t"
" nop\n"
"2:"
: /* no outputs */
: "r" (cpu), "r" (mask), "r" (&page->flags),
"i" (PG_dcache_cpu_mask),
"i" (PG_dcache_cpu_shift)
: "g1", "g7");
}
void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
{
struct page *page;
unsigned long pfn;
unsigned long pg_flags;
pfn = pte_pfn(pte);
if (pfn_valid(pfn) &&
(page = pfn_to_page(pfn), page_mapping(page)) &&
((pg_flags = page->flags) & (1UL << PG_dcache_dirty))) {
int cpu = ((pg_flags >> PG_dcache_cpu_shift) &
PG_dcache_cpu_mask);
int this_cpu = get_cpu();
/* This is just to optimize away some function calls
* in the SMP case.
*/
if (cpu == this_cpu)
flush_dcache_page_impl(page);
else
smp_flush_dcache_page_impl(page, cpu);
clear_dcache_dirty_cpu(page, cpu);
put_cpu();
}
}
void flush_dcache_page(struct page *page)
{
struct address_space *mapping;
int this_cpu;
/* Do not bother with the expensive D-cache flush if it
* is merely the zero page. The 'bigcore' testcase in GDB
* causes this case to run millions of times.
*/
if (page == ZERO_PAGE(0))
return;
this_cpu = get_cpu();
mapping = page_mapping(page);
if (mapping && !mapping_mapped(mapping)) {
int dirty = test_bit(PG_dcache_dirty, &page->flags);
if (dirty) {
int dirty_cpu = dcache_dirty_cpu(page);
if (dirty_cpu == this_cpu)
goto out;
smp_flush_dcache_page_impl(page, dirty_cpu);
}
set_dcache_dirty(page, this_cpu);
} else {
/* We could delay the flush for the !page_mapping
* case too. But that case is for exec env/arg
* pages and those are %99 certainly going to get
* faulted into the tlb (and thus flushed) anyways.
*/
flush_dcache_page_impl(page);
}
out:
put_cpu();
}
void __kprobes flush_icache_range(unsigned long start, unsigned long end)
{
/* Cheetah has coherent I-cache. */
if (tlb_type == spitfire) {
unsigned long kaddr;
for (kaddr = start; kaddr < end; kaddr += PAGE_SIZE)
__flush_icache_page(__get_phys(kaddr));
}
}
unsigned long page_to_pfn(struct page *page)
{
return (unsigned long) ((page - mem_map) + pfn_base);
}
struct page *pfn_to_page(unsigned long pfn)
{
return (mem_map + (pfn - pfn_base));
}
void show_mem(void)
{
printk("Mem-info:\n");
show_free_areas();
printk("Free swap: %6ldkB\n",
nr_swap_pages << (PAGE_SHIFT-10));
printk("%ld pages of RAM\n", num_physpages);
printk("%d free pages\n", nr_free_pages());
printk("%d pages in page table cache\n",pgtable_cache_size);
}
void mmu_info(struct seq_file *m)
{
if (tlb_type == cheetah)
seq_printf(m, "MMU Type\t: Cheetah\n");
else if (tlb_type == cheetah_plus)
seq_printf(m, "MMU Type\t: Cheetah+\n");
else if (tlb_type == spitfire)
seq_printf(m, "MMU Type\t: Spitfire\n");
else
seq_printf(m, "MMU Type\t: ???\n");
#ifdef CONFIG_DEBUG_DCFLUSH
seq_printf(m, "DCPageFlushes\t: %d\n",
atomic_read(&dcpage_flushes));
#ifdef CONFIG_SMP
seq_printf(m, "DCPageFlushesXC\t: %d\n",
atomic_read(&dcpage_flushes_xcall));
#endif /* CONFIG_SMP */
#endif /* CONFIG_DEBUG_DCFLUSH */
}
struct linux_prom_translation {
unsigned long virt;
unsigned long size;
unsigned long data;
};
/* Exported for kernel TLB miss handling in ktlb.S */
struct linux_prom_translation prom_trans[512] __read_mostly;
unsigned int prom_trans_ents __read_mostly;
unsigned int swapper_pgd_zero __read_mostly;
extern unsigned long prom_boot_page;
extern void prom_remap(unsigned long physpage, unsigned long virtpage, int mmu_ihandle);
extern int prom_get_mmu_ihandle(void);
extern void register_prom_callbacks(void);
/* Exported for SMP bootup purposes. */
unsigned long kern_locked_tte_data;
/*
* Translate PROM's mapping we capture at boot time into physical address.
* The second parameter is only set from prom_callback() invocations.
*/
unsigned long prom_virt_to_phys(unsigned long promva, int *error)
{
int i;
for (i = 0; i < prom_trans_ents; i++) {
struct linux_prom_translation *p = &prom_trans[i];
if (promva >= p->virt &&
promva < (p->virt + p->size)) {
unsigned long base = p->data & _PAGE_PADDR;
if (error)
*error = 0;
return base + (promva & (8192 - 1));
}
}
if (error)
*error = 1;
return 0UL;
}
/* The obp translations are saved based on 8k pagesize, since obp can
* use a mixture of pagesizes. Misses to the LOW_OBP_ADDRESS ->
* HI_OBP_ADDRESS range are handled in ktlb.S and do not use the vpte
* scheme (also, see rant in inherit_locked_prom_mappings()).
*/
static inline int in_obp_range(unsigned long vaddr)
{
return (vaddr >= LOW_OBP_ADDRESS &&
vaddr < HI_OBP_ADDRESS);
}
static int cmp_ptrans(const void *a, const void *b)
{
const struct linux_prom_translation *x = a, *y = b;
if (x->virt > y->virt)
return 1;
if (x->virt < y->virt)
return -1;
return 0;
}
/* Read OBP translations property into 'prom_trans[]'. */
static void __init read_obp_translations(void)
{
int n, node, ents, first, last, i;
node = prom_finddevice("/virtual-memory");
n = prom_getproplen(node, "translations");
if (unlikely(n == 0 || n == -1)) {
prom_printf("prom_mappings: Couldn't get size.\n");
prom_halt();
}
if (unlikely(n > sizeof(prom_trans))) {
prom_printf("prom_mappings: Size %Zd is too big.\n", n);
prom_halt();
}
if ((n = prom_getproperty(node, "translations",
(char *)&prom_trans[0],
sizeof(prom_trans))) == -1) {
prom_printf("prom_mappings: Couldn't get property.\n");
prom_halt();
}
n = n / sizeof(struct linux_prom_translation);
ents = n;
sort(prom_trans, ents, sizeof(struct linux_prom_translation),
cmp_ptrans, NULL);
/* Now kick out all the non-OBP entries. */
for (i = 0; i < ents; i++) {
if (in_obp_range(prom_trans[i].virt))
break;
}
first = i;
for (; i < ents; i++) {
if (!in_obp_range(prom_trans[i].virt))
break;
}
last = i;
for (i = 0; i < (last - first); i++) {
struct linux_prom_translation *src = &prom_trans[i + first];
struct linux_prom_translation *dest = &prom_trans[i];
*dest = *src;
}
for (; i < ents; i++) {
struct linux_prom_translation *dest = &prom_trans[i];
dest->virt = dest->size = dest->data = 0x0UL;
}
prom_trans_ents = last - first;
if (tlb_type == spitfire) {
/* Clear diag TTE bits. */
for (i = 0; i < prom_trans_ents; i++)
prom_trans[i].data &= ~0x0003fe0000000000UL;
}
}
static void __init remap_kernel(void)
{
unsigned long phys_page, tte_vaddr, tte_data;
int tlb_ent = sparc64_highest_locked_tlbent();
tte_vaddr = (unsigned long) KERNBASE;
phys_page = (prom_boot_mapping_phys_low >> 22UL) << 22UL;
tte_data = (phys_page | (_PAGE_VALID | _PAGE_SZ4MB |
_PAGE_CP | _PAGE_CV | _PAGE_P |
_PAGE_L | _PAGE_W));
kern_locked_tte_data = tte_data;
/* Now lock us into the TLBs via OBP. */
prom_dtlb_load(tlb_ent, tte_data, tte_vaddr);
prom_itlb_load(tlb_ent, tte_data, tte_vaddr);
if (bigkernel) {
tlb_ent -= 1;
prom_dtlb_load(tlb_ent,
tte_data + 0x400000,
tte_vaddr + 0x400000);
prom_itlb_load(tlb_ent,
tte_data + 0x400000,
tte_vaddr + 0x400000);
}
sparc64_highest_unlocked_tlb_ent = tlb_ent - 1;
if (tlb_type == cheetah_plus) {
sparc64_kern_pri_context = (CTX_CHEETAH_PLUS_CTX0 |
CTX_CHEETAH_PLUS_NUC);
sparc64_kern_pri_nuc_bits = CTX_CHEETAH_PLUS_NUC;
sparc64_kern_sec_context = CTX_CHEETAH_PLUS_CTX0;
}
}
static void __init inherit_prom_mappings(void)
{
read_obp_translations();
/* Now fixup OBP's idea about where we really are mapped. */
prom_printf("Remapping the kernel... ");
remap_kernel();
prom_printf("done.\n");
prom_printf("Registering callbacks... ");
register_prom_callbacks();
prom_printf("done.\n");
}
/* The OBP specifications for sun4u mark 0xfffffffc00000000 and
* upwards as reserved for use by the firmware (I wonder if this
* will be the same on Cheetah...). We use this virtual address
* range for the VPTE table mappings of the nucleus so we need
* to zap them when we enter the PROM. -DaveM
*/
static void __flush_nucleus_vptes(void)
{
unsigned long prom_reserved_base = 0xfffffffc00000000UL;
int i;
/* Only DTLB must be checked for VPTE entries. */
if (tlb_type == spitfire) {
for (i = 0; i < 63; i++) {
unsigned long tag;
/* Spitfire Errata #32 workaround */
/* NOTE: Always runs on spitfire, so no cheetah+
* page size encodings.
*/
__asm__ __volatile__("stxa %0, [%1] %2\n\t"
"flush %%g6"
: /* No outputs */
: "r" (0),
"r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
tag = spitfire_get_dtlb_tag(i);
if (((tag & ~(PAGE_MASK)) == 0) &&
((tag & (PAGE_MASK)) >= prom_reserved_base)) {
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: /* no outputs */
: "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
spitfire_put_dtlb_data(i, 0x0UL);
}
}
} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
for (i = 0; i < 512; i++) {
unsigned long tag = cheetah_get_dtlb_tag(i, 2);
if ((tag & ~PAGE_MASK) == 0 &&
(tag & PAGE_MASK) >= prom_reserved_base) {
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: /* no outputs */
: "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
cheetah_put_dtlb_data(i, 0x0UL, 2);
}
if (tlb_type != cheetah_plus)
continue;
tag = cheetah_get_dtlb_tag(i, 3);
if ((tag & ~PAGE_MASK) == 0 &&
(tag & PAGE_MASK) >= prom_reserved_base) {
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: /* no outputs */
: "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
cheetah_put_dtlb_data(i, 0x0UL, 3);
}
}
} else {
/* Implement me :-) */
BUG();
}
}
static int prom_ditlb_set;
struct prom_tlb_entry {
int tlb_ent;
unsigned long tlb_tag;
unsigned long tlb_data;
};
struct prom_tlb_entry prom_itlb[16], prom_dtlb[16];
void prom_world(int enter)
{
unsigned long pstate;
int i;
if (!enter)
set_fs((mm_segment_t) { get_thread_current_ds() });
if (!prom_ditlb_set)
return;
/* Make sure the following runs atomically. */
__asm__ __volatile__("flushw\n\t"
"rdpr %%pstate, %0\n\t"
"wrpr %0, %1, %%pstate"
: "=r" (pstate)
: "i" (PSTATE_IE));
if (enter) {
/* Kick out nucleus VPTEs. */
__flush_nucleus_vptes();
/* Install PROM world. */
for (i = 0; i < 16; i++) {
if (prom_dtlb[i].tlb_ent != -1) {
__asm__ __volatile__("stxa %0, [%1] %2\n\t"
"membar #Sync"
: : "r" (prom_dtlb[i].tlb_tag), "r" (TLB_TAG_ACCESS),
"i" (ASI_DMMU));
if (tlb_type == spitfire)
spitfire_put_dtlb_data(prom_dtlb[i].tlb_ent,
prom_dtlb[i].tlb_data);
else if (tlb_type == cheetah || tlb_type == cheetah_plus)
cheetah_put_ldtlb_data(prom_dtlb[i].tlb_ent,
prom_dtlb[i].tlb_data);
}
if (prom_itlb[i].tlb_ent != -1) {
__asm__ __volatile__("stxa %0, [%1] %2\n\t"
"membar #Sync"
: : "r" (prom_itlb[i].tlb_tag),
"r" (TLB_TAG_ACCESS),
"i" (ASI_IMMU));
if (tlb_type == spitfire)
spitfire_put_itlb_data(prom_itlb[i].tlb_ent,
prom_itlb[i].tlb_data);
else if (tlb_type == cheetah || tlb_type == cheetah_plus)
cheetah_put_litlb_data(prom_itlb[i].tlb_ent,
prom_itlb[i].tlb_data);
}
}
} else {
for (i = 0; i < 16; i++) {
if (prom_dtlb[i].tlb_ent != -1) {
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
if (tlb_type == spitfire)
spitfire_put_dtlb_data(prom_dtlb[i].tlb_ent, 0x0UL);
else
cheetah_put_ldtlb_data(prom_dtlb[i].tlb_ent, 0x0UL);
}
if (prom_itlb[i].tlb_ent != -1) {
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: : "r" (TLB_TAG_ACCESS),
"i" (ASI_IMMU));
if (tlb_type == spitfire)
spitfire_put_itlb_data(prom_itlb[i].tlb_ent, 0x0UL);
else
cheetah_put_litlb_data(prom_itlb[i].tlb_ent, 0x0UL);
}
}
}
__asm__ __volatile__("wrpr %0, 0, %%pstate"
: : "r" (pstate));
}
void inherit_locked_prom_mappings(int save_p)
{
int i;
int dtlb_seen = 0;
int itlb_seen = 0;
/* Fucking losing PROM has more mappings in the TLB, but
* it (conveniently) fails to mention any of these in the
* translations property. The only ones that matter are
* the locked PROM tlb entries, so we impose the following
* irrecovable rule on the PROM, it is allowed 8 locked
* entries in the ITLB and 8 in the DTLB.
*
* Supposedly the upper 16GB of the address space is
* reserved for OBP, BUT I WISH THIS WAS DOCUMENTED
* SOMEWHERE!!!!!!!!!!!!!!!!! Furthermore the entire interface
* used between the client program and the firmware on sun5
* systems to coordinate mmu mappings is also COMPLETELY
* UNDOCUMENTED!!!!!! Thanks S(t)un!
*/
if (save_p) {
for (i = 0; i < 16; i++) {
prom_itlb[i].tlb_ent = -1;
prom_dtlb[i].tlb_ent = -1;
}
}
if (tlb_type == spitfire) {
int high = sparc64_highest_unlocked_tlb_ent;
for (i = 0; i <= high; i++) {
unsigned long data;
/* Spitfire Errata #32 workaround */
/* NOTE: Always runs on spitfire, so no cheetah+
* page size encodings.
*/
__asm__ __volatile__("stxa %0, [%1] %2\n\t"
"flush %%g6"
: /* No outputs */
: "r" (0),
"r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
data = spitfire_get_dtlb_data(i);
if ((data & (_PAGE_L|_PAGE_VALID)) == (_PAGE_L|_PAGE_VALID)) {
unsigned long tag;
/* Spitfire Errata #32 workaround */
/* NOTE: Always runs on spitfire, so no
* cheetah+ page size encodings.
*/
__asm__ __volatile__("stxa %0, [%1] %2\n\t"
"flush %%g6"
: /* No outputs */
: "r" (0),
"r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
tag = spitfire_get_dtlb_tag(i);
if (save_p) {
prom_dtlb[dtlb_seen].tlb_ent = i;
prom_dtlb[dtlb_seen].tlb_tag = tag;
prom_dtlb[dtlb_seen].tlb_data = data;
}
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
spitfire_put_dtlb_data(i, 0x0UL);
dtlb_seen++;
if (dtlb_seen > 15)
break;
}
}
for (i = 0; i < high; i++) {
unsigned long data;
/* Spitfire Errata #32 workaround */
/* NOTE: Always runs on spitfire, so no
* cheetah+ page size encodings.
*/
__asm__ __volatile__("stxa %0, [%1] %2\n\t"
"flush %%g6"
: /* No outputs */
: "r" (0),
"r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
data = spitfire_get_itlb_data(i);
if ((data & (_PAGE_L|_PAGE_VALID)) == (_PAGE_L|_PAGE_VALID)) {
unsigned long tag;
/* Spitfire Errata #32 workaround */
/* NOTE: Always runs on spitfire, so no
* cheetah+ page size encodings.
*/
__asm__ __volatile__("stxa %0, [%1] %2\n\t"
"flush %%g6"
: /* No outputs */
: "r" (0),
"r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
tag = spitfire_get_itlb_tag(i);
if (save_p) {
prom_itlb[itlb_seen].tlb_ent = i;
prom_itlb[itlb_seen].tlb_tag = tag;
prom_itlb[itlb_seen].tlb_data = data;
}
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: : "r" (TLB_TAG_ACCESS), "i" (ASI_IMMU));
spitfire_put_itlb_data(i, 0x0UL);
itlb_seen++;
if (itlb_seen > 15)
break;
}
}
} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
int high = sparc64_highest_unlocked_tlb_ent;
for (i = 0; i <= high; i++) {
unsigned long data;
data = cheetah_get_ldtlb_data(i);
if ((data & (_PAGE_L|_PAGE_VALID)) == (_PAGE_L|_PAGE_VALID)) {
unsigned long tag;
tag = cheetah_get_ldtlb_tag(i);
if (save_p) {
prom_dtlb[dtlb_seen].tlb_ent = i;
prom_dtlb[dtlb_seen].tlb_tag = tag;
prom_dtlb[dtlb_seen].tlb_data = data;
}
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
cheetah_put_ldtlb_data(i, 0x0UL);
dtlb_seen++;
if (dtlb_seen > 15)
break;
}
}
for (i = 0; i < high; i++) {
unsigned long data;
data = cheetah_get_litlb_data(i);
if ((data & (_PAGE_L|_PAGE_VALID)) == (_PAGE_L|_PAGE_VALID)) {
unsigned long tag;
tag = cheetah_get_litlb_tag(i);
if (save_p) {
prom_itlb[itlb_seen].tlb_ent = i;
prom_itlb[itlb_seen].tlb_tag = tag;
prom_itlb[itlb_seen].tlb_data = data;
}
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: : "r" (TLB_TAG_ACCESS), "i" (ASI_IMMU));
cheetah_put_litlb_data(i, 0x0UL);
itlb_seen++;
if (itlb_seen > 15)
break;
}
}
} else {
/* Implement me :-) */
BUG();
}
if (save_p)
prom_ditlb_set = 1;
}
/* Give PROM back his world, done during reboots... */
void prom_reload_locked(void)
{
int i;
for (i = 0; i < 16; i++) {
if (prom_dtlb[i].tlb_ent != -1) {
__asm__ __volatile__("stxa %0, [%1] %2\n\t"
"membar #Sync"
: : "r" (prom_dtlb[i].tlb_tag), "r" (TLB_TAG_ACCESS),
"i" (ASI_DMMU));
if (tlb_type == spitfire)
spitfire_put_dtlb_data(prom_dtlb[i].tlb_ent,
prom_dtlb[i].tlb_data);
else if (tlb_type == cheetah || tlb_type == cheetah_plus)
cheetah_put_ldtlb_data(prom_dtlb[i].tlb_ent,
prom_dtlb[i].tlb_data);
}
if (prom_itlb[i].tlb_ent != -1) {
__asm__ __volatile__("stxa %0, [%1] %2\n\t"
"membar #Sync"
: : "r" (prom_itlb[i].tlb_tag),
"r" (TLB_TAG_ACCESS),
"i" (ASI_IMMU));
if (tlb_type == spitfire)
spitfire_put_itlb_data(prom_itlb[i].tlb_ent,
prom_itlb[i].tlb_data);
else
cheetah_put_litlb_data(prom_itlb[i].tlb_ent,
prom_itlb[i].tlb_data);
}
}
}
#ifdef DCACHE_ALIASING_POSSIBLE
void __flush_dcache_range(unsigned long start, unsigned long end)
{
unsigned long va;
if (tlb_type == spitfire) {
int n = 0;
for (va = start; va < end; va += 32) {
spitfire_put_dcache_tag(va & 0x3fe0, 0x0);
if (++n >= 512)
break;
}
} else {
start = __pa(start);
end = __pa(end);
for (va = start; va < end; va += 32)
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: /* no outputs */
: "r" (va),
"i" (ASI_DCACHE_INVALIDATE));
}
}
#endif /* DCACHE_ALIASING_POSSIBLE */
/* If not locked, zap it. */
void __flush_tlb_all(void)
{
unsigned long pstate;
int i;
__asm__ __volatile__("flushw\n\t"
"rdpr %%pstate, %0\n\t"
"wrpr %0, %1, %%pstate"
: "=r" (pstate)
: "i" (PSTATE_IE));
if (tlb_type == spitfire) {
for (i = 0; i < 64; i++) {
/* Spitfire Errata #32 workaround */
/* NOTE: Always runs on spitfire, so no
* cheetah+ page size encodings.
*/
__asm__ __volatile__("stxa %0, [%1] %2\n\t"
"flush %%g6"
: /* No outputs */
: "r" (0),
"r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
if (!(spitfire_get_dtlb_data(i) & _PAGE_L)) {
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: /* no outputs */
: "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
spitfire_put_dtlb_data(i, 0x0UL);
}
/* Spitfire Errata #32 workaround */
/* NOTE: Always runs on spitfire, so no
* cheetah+ page size encodings.
*/
__asm__ __volatile__("stxa %0, [%1] %2\n\t"
"flush %%g6"
: /* No outputs */
: "r" (0),
"r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));
if (!(spitfire_get_itlb_data(i) & _PAGE_L)) {
__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
"membar #Sync"
: /* no outputs */
: "r" (TLB_TAG_ACCESS), "i" (ASI_IMMU));
spitfire_put_itlb_data(i, 0x0UL);
}
}
} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
cheetah_flush_dtlb_all();
cheetah_flush_itlb_all();
}
__asm__ __volatile__("wrpr %0, 0, %%pstate"
: : "r" (pstate));
}
/* Caller does TLB context flushing on local CPU if necessary.
* The caller also ensures that CTX_VALID(mm->context) is false.
*
* We must be careful about boundary cases so that we never
* let the user have CTX 0 (nucleus) or we ever use a CTX
* version of zero (and thus NO_CONTEXT would not be caught
* by version mis-match tests in mmu_context.h).
*/
void get_new_mmu_context(struct mm_struct *mm)
{
unsigned long ctx, new_ctx;
unsigned long orig_pgsz_bits;
spin_lock(&ctx_alloc_lock);
orig_pgsz_bits = (mm->context.sparc64_ctx_val & CTX_PGSZ_MASK);
ctx = (tlb_context_cache + 1) & CTX_NR_MASK;
new_ctx = find_next_zero_bit(mmu_context_bmap, 1 << CTX_NR_BITS, ctx);
if (new_ctx >= (1 << CTX_NR_BITS)) {
new_ctx = find_next_zero_bit(mmu_context_bmap, ctx, 1);
if (new_ctx >= ctx) {
int i;
new_ctx = (tlb_context_cache & CTX_VERSION_MASK) +
CTX_FIRST_VERSION;
if (new_ctx == 1)
new_ctx = CTX_FIRST_VERSION;
/* Don't call memset, for 16 entries that's just
* plain silly...
*/
mmu_context_bmap[0] = 3;
mmu_context_bmap[1] = 0;
mmu_context_bmap[2] = 0;
mmu_context_bmap[3] = 0;
for (i = 4; i < CTX_BMAP_SLOTS; i += 4) {
mmu_context_bmap[i + 0] = 0;
mmu_context_bmap[i + 1] = 0;
mmu_context_bmap[i + 2] = 0;
mmu_context_bmap[i + 3] = 0;
}
goto out;
}
}
mmu_context_bmap[new_ctx>>6] |= (1UL << (new_ctx & 63));
new_ctx |= (tlb_context_cache & CTX_VERSION_MASK);
out:
tlb_context_cache = new_ctx;
mm->context.sparc64_ctx_val = new_ctx | orig_pgsz_bits;
spin_unlock(&ctx_alloc_lock);
}
#ifndef CONFIG_SMP
struct pgtable_cache_struct pgt_quicklists;
#endif
/* OK, we have to color these pages. The page tables are accessed
* by non-Dcache enabled mapping in the VPTE area by the dtlb_backend.S
* code, as well as by PAGE_OFFSET range direct-mapped addresses by
* other parts of the kernel. By coloring, we make sure that the tlbmiss
* fast handlers do not get data from old/garbage dcache lines that
* correspond to an old/stale virtual address (user/kernel) that
* previously mapped the pagetable page while accessing vpte range
* addresses. The idea is that if the vpte color and PAGE_OFFSET range
* color is the same, then when the kernel initializes the pagetable
* using the later address range, accesses with the first address
* range will see the newly initialized data rather than the garbage.
*/
#ifdef DCACHE_ALIASING_POSSIBLE
#define DC_ALIAS_SHIFT 1
#else
#define DC_ALIAS_SHIFT 0
#endif
pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
{
struct page *page;
unsigned long color;
{
pte_t *ptep = pte_alloc_one_fast(mm, address);
if (ptep)
return ptep;
}
color = VPTE_COLOR(address);
page = alloc_pages(GFP_KERNEL|__GFP_REPEAT, DC_ALIAS_SHIFT);
if (page) {
unsigned long *to_free;
unsigned long paddr;
pte_t *pte;
#ifdef DCACHE_ALIASING_POSSIBLE
set_page_count(page, 1);
ClearPageCompound(page);
set_page_count((page + 1), 1);
ClearPageCompound(page + 1);
#endif
paddr = (unsigned long) page_address(page);
memset((char *)paddr, 0, (PAGE_SIZE << DC_ALIAS_SHIFT));
if (!color) {
pte = (pte_t *) paddr;
to_free = (unsigned long *) (paddr + PAGE_SIZE);
} else {
pte = (pte_t *) (paddr + PAGE_SIZE);
to_free = (unsigned long *) paddr;
}
#ifdef DCACHE_ALIASING_POSSIBLE
/* Now free the other one up, adjust cache size. */
preempt_disable();
*to_free = (unsigned long) pte_quicklist[color ^ 0x1];
pte_quicklist[color ^ 0x1] = to_free;
pgtable_cache_size++;
preempt_enable();
#endif
return pte;
}
return NULL;
}
void sparc_ultra_dump_itlb(void)
{
int slot;
if (tlb_type == spitfire) {
printk ("Contents of itlb: ");
for (slot = 0; slot < 14; slot++) printk (" ");
printk ("%2x:%016lx,%016lx\n",
0,
spitfire_get_itlb_tag(0), spitfire_get_itlb_data(0));
for (slot = 1; slot < 64; slot+=3) {
printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx %2x:%016lx,%016lx\n",
slot,
spitfire_get_itlb_tag(slot), spitfire_get_itlb_data(slot),
slot+1,
spitfire_get_itlb_tag(slot+1), spitfire_get_itlb_data(slot+1),
slot+2,
spitfire_get_itlb_tag(slot+2), spitfire_get_itlb_data(slot+2));
}
} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
printk ("Contents of itlb0:\n");
for (slot = 0; slot < 16; slot+=2) {
printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
slot,
cheetah_get_litlb_tag(slot), cheetah_get_litlb_data(slot),
slot+1,
cheetah_get_litlb_tag(slot+1), cheetah_get_litlb_data(slot+1));
}
printk ("Contents of itlb2:\n");
for (slot = 0; slot < 128; slot+=2) {
printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
slot,
cheetah_get_itlb_tag(slot), cheetah_get_itlb_data(slot),
slot+1,
cheetah_get_itlb_tag(slot+1), cheetah_get_itlb_data(slot+1));
}
}
}
void sparc_ultra_dump_dtlb(void)
{
int slot;
if (tlb_type == spitfire) {
printk ("Contents of dtlb: ");
for (slot = 0; slot < 14; slot++) printk (" ");
printk ("%2x:%016lx,%016lx\n", 0,
spitfire_get_dtlb_tag(0), spitfire_get_dtlb_data(0));
for (slot = 1; slot < 64; slot+=3) {
printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx %2x:%016lx,%016lx\n",
slot,
spitfire_get_dtlb_tag(slot), spitfire_get_dtlb_data(slot),
slot+1,
spitfire_get_dtlb_tag(slot+1), spitfire_get_dtlb_data(slot+1),
slot+2,
spitfire_get_dtlb_tag(slot+2), spitfire_get_dtlb_data(slot+2));
}
} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
printk ("Contents of dtlb0:\n");
for (slot = 0; slot < 16; slot+=2) {
printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
slot,
cheetah_get_ldtlb_tag(slot), cheetah_get_ldtlb_data(slot),
slot+1,
cheetah_get_ldtlb_tag(slot+1), cheetah_get_ldtlb_data(slot+1));
}
printk ("Contents of dtlb2:\n");
for (slot = 0; slot < 512; slot+=2) {
printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
slot,
cheetah_get_dtlb_tag(slot, 2), cheetah_get_dtlb_data(slot, 2),
slot+1,
cheetah_get_dtlb_tag(slot+1, 2), cheetah_get_dtlb_data(slot+1, 2));
}
if (tlb_type == cheetah_plus) {
printk ("Contents of dtlb3:\n");
for (slot = 0; slot < 512; slot+=2) {
printk ("%2x:%016lx,%016lx %2x:%016lx,%016lx\n",
slot,
cheetah_get_dtlb_tag(slot, 3), cheetah_get_dtlb_data(slot, 3),
slot+1,
cheetah_get_dtlb_tag(slot+1, 3), cheetah_get_dtlb_data(slot+1, 3));
}
}
}
}
extern unsigned long cmdline_memory_size;
unsigned long __init bootmem_init(unsigned long *pages_avail)
{
unsigned long bootmap_size, start_pfn, end_pfn;
unsigned long end_of_phys_memory = 0UL;
unsigned long bootmap_pfn, bytes_avail, size;
int i;
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("bootmem_init: Scan pavail, ");
#endif
bytes_avail = 0UL;
for (i = 0; i < pavail_ents; i++) {
end_of_phys_memory = pavail[i].phys_addr +
pavail[i].reg_size;
bytes_avail += pavail[i].reg_size;
if (cmdline_memory_size) {
if (bytes_avail > cmdline_memory_size) {
unsigned long slack = bytes_avail - cmdline_memory_size;
bytes_avail -= slack;
end_of_phys_memory -= slack;
pavail[i].reg_size -= slack;
if ((long)pavail[i].reg_size <= 0L) {
pavail[i].phys_addr = 0xdeadbeefUL;
pavail[i].reg_size = 0UL;
pavail_ents = i;
} else {
pavail[i+1].reg_size = 0Ul;
pavail[i+1].phys_addr = 0xdeadbeefUL;
pavail_ents = i + 1;
}
break;
}
}
}
*pages_avail = bytes_avail >> PAGE_SHIFT;
/* Start with page aligned address of last symbol in kernel
* image. The kernel is hard mapped below PAGE_OFFSET in a
* 4MB locked TLB translation.
*/
start_pfn = PAGE_ALIGN(kern_base + kern_size) >> PAGE_SHIFT;
bootmap_pfn = start_pfn;
end_pfn = end_of_phys_memory >> PAGE_SHIFT;
#ifdef CONFIG_BLK_DEV_INITRD
/* Now have to check initial ramdisk, so that bootmap does not overwrite it */
if (sparc_ramdisk_image || sparc_ramdisk_image64) {
unsigned long ramdisk_image = sparc_ramdisk_image ?
sparc_ramdisk_image : sparc_ramdisk_image64;
if (ramdisk_image >= (unsigned long)_end - 2 * PAGE_SIZE)
ramdisk_image -= KERNBASE;
initrd_start = ramdisk_image + phys_base;
initrd_end = initrd_start + sparc_ramdisk_size;
if (initrd_end > end_of_phys_memory) {
printk(KERN_CRIT "initrd extends beyond end of memory "
"(0x%016lx > 0x%016lx)\ndisabling initrd\n",
initrd_end, end_of_phys_memory);
initrd_start = 0;
}
if (initrd_start) {
if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
}
}
#endif
/* Initialize the boot-time allocator. */
max_pfn = max_low_pfn = end_pfn;
min_low_pfn = pfn_base;
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("init_bootmem(min[%lx], bootmap[%lx], max[%lx])\n",
min_low_pfn, bootmap_pfn, max_low_pfn);
#endif
bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base, end_pfn);
/* Now register the available physical memory with the
* allocator.
*/
for (i = 0; i < pavail_ents; i++) {
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("free_bootmem(pavail:%d): base[%lx] size[%lx]\n",
i, pavail[i].phys_addr, pavail[i].reg_size);
#endif
free_bootmem(pavail[i].phys_addr, pavail[i].reg_size);
}
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start) {
size = initrd_end - initrd_start;
/* Resert the initrd image area. */
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("reserve_bootmem(initrd): base[%llx] size[%lx]\n",
initrd_start, initrd_end);
#endif
reserve_bootmem(initrd_start, size);
*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
initrd_start += PAGE_OFFSET;
initrd_end += PAGE_OFFSET;
}
#endif
/* Reserve the kernel text/data/bss. */
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("reserve_bootmem(kernel): base[%lx] size[%lx]\n", kern_base, kern_size);
#endif
reserve_bootmem(kern_base, kern_size);
*pages_avail -= PAGE_ALIGN(kern_size) >> PAGE_SHIFT;
/* Reserve the bootmem map. We do not account for it
* in pages_avail because we will release that memory
* in free_all_bootmem.
*/
size = bootmap_size;
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("reserve_bootmem(bootmap): base[%lx] size[%lx]\n",
(bootmap_pfn << PAGE_SHIFT), size);
#endif
reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size);
*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
return end_pfn;
}
#ifdef CONFIG_DEBUG_PAGEALLOC
static unsigned long kernel_map_range(unsigned long pstart, unsigned long pend, pgprot_t prot)
{
unsigned long vstart = PAGE_OFFSET + pstart;
unsigned long vend = PAGE_OFFSET + pend;
unsigned long alloc_bytes = 0UL;
if ((vstart & ~PAGE_MASK) || (vend & ~PAGE_MASK)) {
prom_printf("kernel_map: Unaligned physmem[%lx:%lx]\n",
vstart, vend);
prom_halt();
}
while (vstart < vend) {
unsigned long this_end, paddr = __pa(vstart);
pgd_t *pgd = pgd_offset_k(vstart);
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
pud = pud_offset(pgd, vstart);
if (pud_none(*pud)) {
pmd_t *new;
new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
alloc_bytes += PAGE_SIZE;
pud_populate(&init_mm, pud, new);
}
pmd = pmd_offset(pud, vstart);
if (!pmd_present(*pmd)) {
pte_t *new;
new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
alloc_bytes += PAGE_SIZE;
pmd_populate_kernel(&init_mm, pmd, new);
}
pte = pte_offset_kernel(pmd, vstart);
this_end = (vstart + PMD_SIZE) & PMD_MASK;
if (this_end > vend)
this_end = vend;
while (vstart < this_end) {
pte_val(*pte) = (paddr | pgprot_val(prot));
vstart += PAGE_SIZE;
paddr += PAGE_SIZE;
pte++;
}
}
return alloc_bytes;
}
static struct linux_prom64_registers pall[MAX_BANKS] __initdata;
static int pall_ents __initdata;
extern unsigned int kvmap_linear_patch[1];
static void __init kernel_physical_mapping_init(void)
{
unsigned long i, mem_alloced = 0UL;
read_obp_memory("reg", &pall[0], &pall_ents);
for (i = 0; i < pall_ents; i++) {
unsigned long phys_start, phys_end;
phys_start = pall[i].phys_addr;
phys_end = phys_start + pall[i].reg_size;
mem_alloced += kernel_map_range(phys_start, phys_end,
PAGE_KERNEL);
}
printk("Allocated %ld bytes for kernel page tables.\n",
mem_alloced);
kvmap_linear_patch[0] = 0x01000000; /* nop */
flushi(&kvmap_linear_patch[0]);
__flush_tlb_all();
}
void kernel_map_pages(struct page *page, int numpages, int enable)
{
unsigned long phys_start = page_to_pfn(page) << PAGE_SHIFT;
unsigned long phys_end = phys_start + (numpages * PAGE_SIZE);
kernel_map_range(phys_start, phys_end,
(enable ? PAGE_KERNEL : __pgprot(0)));
/* we should perform an IPI and flush all tlbs,
* but that can deadlock->flush only current cpu.
*/
__flush_tlb_kernel_range(PAGE_OFFSET + phys_start,
PAGE_OFFSET + phys_end);
}
#endif
unsigned long __init find_ecache_flush_span(unsigned long size)
{
int i;
for (i = 0; i < pavail_ents; i++) {
if (pavail[i].reg_size >= size)
return pavail[i].phys_addr;
}
return ~0UL;
}
/* paging_init() sets up the page tables */
extern void cheetah_ecache_flush_init(void);
static unsigned long last_valid_pfn;
pgd_t swapper_pg_dir[2048];
void __init paging_init(void)
{
unsigned long end_pfn, pages_avail, shift;
unsigned long real_end, i;
/* Find available physical memory... */
read_obp_memory("available", &pavail[0], &pavail_ents);
phys_base = 0xffffffffffffffffUL;
for (i = 0; i < pavail_ents; i++)
phys_base = min(phys_base, pavail[i].phys_addr);
pfn_base = phys_base >> PAGE_SHIFT;
kern_base = (prom_boot_mapping_phys_low >> 22UL) << 22UL;
kern_size = (unsigned long)&_end - (unsigned long)KERNBASE;
set_bit(0, mmu_context_bmap);
shift = kern_base + PAGE_OFFSET - ((unsigned long)KERNBASE);
real_end = (unsigned long)_end;
if ((real_end > ((unsigned long)KERNBASE + 0x400000)))
bigkernel = 1;
if ((real_end > ((unsigned long)KERNBASE + 0x800000))) {
prom_printf("paging_init: Kernel > 8MB, too large.\n");
prom_halt();
}
/* Set kernel pgd to upper alias so physical page computations
* work.
*/
init_mm.pgd += ((shift) / (sizeof(pgd_t)));
memset(swapper_low_pmd_dir, 0, sizeof(swapper_low_pmd_dir));
/* Now can init the kernel/bad page tables. */
pud_set(pud_offset(&swapper_pg_dir[0], 0),
swapper_low_pmd_dir + (shift / sizeof(pgd_t)));
swapper_pgd_zero = pgd_val(swapper_pg_dir[0]);
inherit_prom_mappings();
/* Ok, we can use our TLB miss and window trap handlers safely.
* We need to do a quick peek here to see if we are on StarFire
* or not, so setup_tba can setup the IRQ globals correctly (it
* needs to get the hard smp processor id correctly).
*/
{
extern void setup_tba(int);
setup_tba(this_is_starfire);
}
inherit_locked_prom_mappings(1);
__flush_tlb_all();
/* Setup bootmem... */
pages_avail = 0;
last_valid_pfn = end_pfn = bootmem_init(&pages_avail);
#ifdef CONFIG_DEBUG_PAGEALLOC
kernel_physical_mapping_init();
#endif
{
unsigned long zones_size[MAX_NR_ZONES];
unsigned long zholes_size[MAX_NR_ZONES];
unsigned long npages;
int znum;
for (znum = 0; znum < MAX_NR_ZONES; znum++)
zones_size[znum] = zholes_size[znum] = 0;
npages = end_pfn - pfn_base;
zones_size[ZONE_DMA] = npages;
zholes_size[ZONE_DMA] = npages - pages_avail;
free_area_init_node(0, &contig_page_data, zones_size,
phys_base >> PAGE_SHIFT, zholes_size);
}
device_scan();
}
static void __init taint_real_pages(void)
{
int i;
read_obp_memory("available", &pavail_rescan[0], &pavail_rescan_ents);
/* Find changes discovered in the physmem available rescan and
* reserve the lost portions in the bootmem maps.
*/
for (i = 0; i < pavail_ents; i++) {
unsigned long old_start, old_end;
old_start = pavail[i].phys_addr;
old_end = old_start +
pavail[i].reg_size;
while (old_start < old_end) {
int n;
for (n = 0; pavail_rescan_ents; n++) {
unsigned long new_start, new_end;
new_start = pavail_rescan[n].phys_addr;
new_end = new_start +
pavail_rescan[n].reg_size;
if (new_start <= old_start &&
new_end >= (old_start + PAGE_SIZE)) {
set_bit(old_start >> 22,
sparc64_valid_addr_bitmap);
goto do_next_page;
}
}
reserve_bootmem(old_start, PAGE_SIZE);
do_next_page:
old_start += PAGE_SIZE;
}
}
}
void __init mem_init(void)
{
unsigned long codepages, datapages, initpages;
unsigned long addr, last;
int i;
i = last_valid_pfn >> ((22 - PAGE_SHIFT) + 6);
i += 1;
sparc64_valid_addr_bitmap = (unsigned long *) alloc_bootmem(i << 3);
if (sparc64_valid_addr_bitmap == NULL) {
prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
prom_halt();
}
memset(sparc64_valid_addr_bitmap, 0, i << 3);
addr = PAGE_OFFSET + kern_base;
last = PAGE_ALIGN(kern_size) + addr;
while (addr < last) {
set_bit(__pa(addr) >> 22, sparc64_valid_addr_bitmap);
addr += PAGE_SIZE;
}
taint_real_pages();
max_mapnr = last_valid_pfn - pfn_base;
high_memory = __va(last_valid_pfn << PAGE_SHIFT);
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("mem_init: Calling free_all_bootmem().\n");
#endif
totalram_pages = num_physpages = free_all_bootmem() - 1;
/*
* Set up the zero page, mark it reserved, so that page count
* is not manipulated when freeing the page from user ptes.
*/
mem_map_zero = alloc_pages(GFP_KERNEL|__GFP_ZERO, 0);
if (mem_map_zero == NULL) {
prom_printf("paging_init: Cannot alloc zero page.\n");
prom_halt();
}
SetPageReserved(mem_map_zero);
codepages = (((unsigned long) _etext) - ((unsigned long) _start));
codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
datapages = (((unsigned long) _edata) - ((unsigned long) _etext));
datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
initpages = (((unsigned long) __init_end) - ((unsigned long) __init_begin));
initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
printk("Memory: %uk available (%ldk kernel code, %ldk data, %ldk init) [%016lx,%016lx]\n",
nr_free_pages() << (PAGE_SHIFT-10),
codepages << (PAGE_SHIFT-10),
datapages << (PAGE_SHIFT-10),
initpages << (PAGE_SHIFT-10),
PAGE_OFFSET, (last_valid_pfn << PAGE_SHIFT));
if (tlb_type == cheetah || tlb_type == cheetah_plus)
cheetah_ecache_flush_init();
}
void free_initmem(void)
{
unsigned long addr, initend;
/*
* The init section is aligned to 8k in vmlinux.lds. Page align for >8k pagesizes.
*/
addr = PAGE_ALIGN((unsigned long)(__init_begin));
initend = (unsigned long)(__init_end) & PAGE_MASK;
for (; addr < initend; addr += PAGE_SIZE) {
unsigned long page;
struct page *p;
page = (addr +
((unsigned long) __va(kern_base)) -
((unsigned long) KERNBASE));
memset((void *)addr, 0xcc, PAGE_SIZE);
p = virt_to_page(page);
ClearPageReserved(p);
set_page_count(p, 1);
__free_page(p);
num_physpages++;
totalram_pages++;
}
}
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
if (start < end)
printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
for (; start < end; start += PAGE_SIZE) {
struct page *p = virt_to_page(start);
ClearPageReserved(p);
set_page_count(p, 1);
__free_page(p);
num_physpages++;
totalram_pages++;
}
}
#endif
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