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android_kernel_xiaomi_sm8350/arch/sparc64/mm/init.c
David S. Miller 9ad98c5b44 [SPARC64]: Fix initrd when net booting. 
By allocating early memory for the firmware page tables, we
can write over the beginning of the initrd image.

So what we do now is:

1) Read in firmware translations table while still on the
   firmware's trap table.
2) Switch to Linux trap table.
3) Init bootmem.
4) Build firmware page tables using __alloc_bootmem().

And this keeps the initrd from being clobbered.

Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-05 15:12:00 -07:00

1718 lines
46 KiB
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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;
};
static struct linux_prom_translation prom_trans[512] __initdata;
static unsigned int prom_trans_ents __initdata;
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;
/* Exported for kernel TLB miss handling in ktlb.S */
unsigned long prom_pmd_phys __read_mostly;
unsigned int swapper_pgd_zero __read_mostly;
static pmd_t *prompmd __read_mostly;
#define BASE_PAGE_SIZE 8192
/*
* 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)
{
pmd_t *pmdp = prompmd + ((promva >> 23) & 0x7ff);
pte_t *ptep;
unsigned long base;
if (pmd_none(*pmdp)) {
if (error)
*error = 1;
return 0;
}
ptep = (pte_t *)__pmd_page(*pmdp) + ((promva >> 13) & 0x3ff);
if (!pte_present(*ptep)) {
if (error)
*error = 1;
return 0;
}
if (error) {
*error = 0;
return pte_val(*ptep);
}
base = pte_val(*ptep) & _PAGE_PADDR;
return base + (promva & (BASE_PAGE_SIZE - 1));
}
/* 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 entry.S and do not use the vpte
* scheme (also, see rant in inherit_locked_prom_mappings()).
*/
static void __init build_obp_range(unsigned long start, unsigned long end, unsigned long data)
{
unsigned long vaddr;
for (vaddr = start; vaddr < end; vaddr += BASE_PAGE_SIZE) {
unsigned long val;
pmd_t *pmd;
pte_t *pte;
pmd = prompmd + ((vaddr >> 23) & 0x7ff);
if (pmd_none(*pmd)) {
pte = __alloc_bootmem(BASE_PAGE_SIZE, BASE_PAGE_SIZE,
PAGE_SIZE);
if (!pte)
prom_halt();
memset(pte, 0, BASE_PAGE_SIZE);
pmd_set(pmd, pte);
}
pte = (pte_t *) __pmd_page(*pmd) + ((vaddr >> 13) & 0x3ff);
val = data;
/* Clear diag TTE bits. */
if (tlb_type == spitfire)
val &= ~0x0003fe0000000000UL;
set_pte_at(&init_mm, vaddr, pte,
__pte(val | _PAGE_MODIFIED));
data += BASE_PAGE_SIZE;
}
}
static inline int in_obp_range(unsigned long vaddr)
{
return (vaddr >= LOW_OBP_ADDRESS &&
vaddr < HI_OBP_ADDRESS);
}
#define OBP_PMD_SIZE 2048
static void __init build_obp_pgtable(void)
{
unsigned long i;
prompmd = __alloc_bootmem(OBP_PMD_SIZE, OBP_PMD_SIZE, PAGE_SIZE);
if (!prompmd)
prom_halt();
memset(prompmd, 0, OBP_PMD_SIZE);
prom_pmd_phys = __pa(prompmd);
for (i = 0; i < prom_trans_ents; i++) {
unsigned long start, end;
if (!in_obp_range(prom_trans[i].virt))
continue;
start = prom_trans[i].virt;
end = start + prom_trans[i].size;
if (end > HI_OBP_ADDRESS)
end = HI_OBP_ADDRESS;
build_obp_range(start, end, prom_trans[i].data);
}
}
/* Read OBP translations property into 'prom_trans[]'.
* Return the number of entries.
*/
static void __init read_obp_translations(void)
{
int n, node;
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);
prom_trans_ents = n;
}
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_pre(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");
}
static void __init inherit_prom_mappings_post(void)
{
build_obp_pgtable();
register_prom_callbacks();
}
/* 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_pre();
/* 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);
}
__flush_tlb_all();
/* Everything from this point forward, until we are done with
* inherit_prom_mappings_post(), must complete successfully
* without calling into the firmware. The firwmare page tables
* have not been built, but we are running on the Linux kernel's
* trap table.
*/
/* Setup bootmem... */
pages_avail = 0;
last_valid_pfn = end_pfn = bootmem_init(&pages_avail);
inherit_prom_mappings_post();
inherit_locked_prom_mappings(1);
#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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